Alcator C-Mod Run 1120904 Information

Miniproposals

Miniproposal: 708

Date Filed: 6/21/2012

Title: RF sheath rectification is plasmas heated with a field-aligned ICRF antenna

First Author: Roman Ochoukov

Session Leader: Roman Ochoukov (shots 1-28)

Operators
Session leader(s):	Roman Ochoukov
Physics operator(s):	Bill Rowan
Engineering operator(s):	Bill Cochran,Ed Fitzgerald

Engineering Operator Run Comment
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Session Leader Plans

Entered: Aug 31 2012 10:47:42:630AM

Author: Roman Ochoukov

Run plan for 1120904xxx and 1120905xxx.

This run is a combination of MP708 "RF sheath rectification in plasmas heated
with a field-aligned ICRF antenna" and MP682 "Continued studies of RF induced
electric fields in the SOL"

SL: R. Ochoukov (1120904xxx) and J. Terry (1120905xxx)
PO: W. Rowan (1120904xxx) and S. Wukitch (1120905xxx)

Critical diagnostics for this 1 1/2-day run are: emissive probes (A-B limiter,
ASP, SSS) and GPI.
GPI He puff is seeded with N2 to measure N2 penetration in presence of ICRF power.

Step 1. Establish a reference shot: 1110214016, Bt = 5.45 T, Ip = 0.8 MA, LSN,
nl04 = 0.9x10^20 m^-2.

Three ASP plunges at 0.7, 1.05 and 1.4 s.
One GPI acquisition between 0.55 and 1.15 s.

Three ICRF antenna stepped ramps:
FA-J from 0.55 to 0.85 s, from 0.1 to 1.5 MW
D from 0.90 to 1.15 s, from 0.1 to 1.5 MW
E from 1.2 to 1.5 s, from 0.1 to 1.5 MW (if available)

2 good shots.

Step 2. Repeat the ref. shot but vary teh Z position of the plasma shot-by-shot or dynamically to poloidally "match" FA-J and D antenna "piercing" field lines.

3 good shots with FA-J and D antennas ramped simultaenously.
1 good shot with FA-J and D antennas ramped sequentially.

Step 3. Repeat the reference shot but with Ip = 0.6, 1.0 and 1.2 MA.
3 good shots.

Step 4. Repeat Steps 1 and 3 but with FA-J in monopole phasing @ Ip = 0.8, 1.0 and 1.2 MA. one set with conformal and one set non-conformal antenna mappings.
6 good shots.

Step 5. Repeat Step 1 but with Bt = 2.725 T / Ip = 0.4 MA. Antennas powered sequentially.
1 good shot.

Step 6. Repeat Step 5 but with FA-J in monopole phasing.
1 good shot.

Step 7. Repeat Step 1 but with nl04 @ 0.6 and 1.2 x 10^20 m^-2. Antennas powered sequentially.
2 good shots.

Step 8. Repeat Step 1 but in an inner wall limited geometry.
1 good shot.

Step 9. Repeat Step 1 but apply Ne seeding: ~2 psi from B-side lower, 150-200 ms pulse duration @ 50-60 V on the piezo).
2 good shots.

Step 10. Repeat Step 9 but with FA-J in monopole phasing.
1 good shot.

Step 11. Repeat Step 1 but with Bt = 8.0 T / Ip = 1.16 MA. Antennas powered sequentially.
2 good shots.

Step 12. Repeat Step 11 but with FA-J in monopole phasing.
1 good shot.

Total is: 26 good shots.

Physics Operators Plans

Entered: Sep 4 2012 07:50:10:070AM

Author: Bill Rowan

Physics Operator Plan for 04 Sep 2012, 1120904

MP708 - RF sheath rectification in plasmas heated with a field-aligned ICRF antenna

SL: Roman Ochoukov and Jim Terry
PO: Bill Rowan

Critical diagnostics: emissive probes (A-B limiter, ASP, SSS) and GPI.

-----------------
Engineering Setup
-----------------

Run begins at 10:00 and ends at 17:00

Power systems as on: 1110214016

Acoil: -Dtop +Dbot +Jtop -Jbot (standard) Hybrid Enabled

Gas setup:

Fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3)
leave H-bottom as is Hybrid DISABLED (PG5)
leave B-div as is Hybrid DISABLED (PG6)
leave H-div as is Hybrid DISABLED (PG7)

*********Special Instructions for NINJA*********
fill NINJA F-port with 10 psi D2 DISABLED

Instructions for filling the C port plenum of the NINJA gas system:
purge the NINJA system three times;
after the final purge, fill the C port plenum with 2 psi of N2; THE NITROGEN
MUST BE PUT IN BEFORE THE He4;
"on top of" the N2, fill the C port plenum with 13 psi of He4;
Ideally do this as soon as possible on Tuesday.
******************************************

Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo, HIREX-Sr, Xeus, LoWEUS

Torvac gatevalve toggle (yes/no): no

Boronization(yes/no): no
Overnight ECDC (yes/no): yes, in Helium
ICRF(yes/no): yes
LH(yes/no): no
Cryopump (yes/no): no
DNB (yes/no): yes

Vessel temperature: 35/35/35

------------------------------
ECDC Parameters (if requested) NOTE: HELIUM ECDC
------------------------------
gas and pressure: HELIUM at 5.e-5 Torr
sweep: 44/45/103 cm
scan: 20/120 s

Session Leader Summaries

Entered: Sep 4 2012 06:09:46:340PM

Author: Roman Ochoukov

Session leader summary for 1120904xxx: MP708 and MP682.

We managed to complete steps 1, 2, 3, 4 and 7-ish (different nl04 values from those specified in the original run plan) of our run plan.

However, the original Z-position scan (step 2) called for the FA-J and D antenna combination and D antenna was not avaiable for today. We had to use the E antenna instead.

A brief summary is: the highest ICRF-induced potentials were measured in the
1.2 MA shot during the FA-J heated part of the discharge with the FA-J antenna
in monopole phasing -- plasma potentials up to about +300 Volts.

A 1.2 MA shot heated with FA-J antenna in regular phasing (0,pi,0,pi) configuration showed ICRF-enhanced potentials in the range of 100-200 V.

A clear "RF cell" radial structure structure was observed in the 1.2 MA discharges during the FA-J antenna heating part of the discharges. The Er field reversal was at Rmid = 0.92 and 0.95 m. This structure was not observed at
any other Ip.

Plasma potentials for all shots at 1.0 MA or less were <=100 V, even in the monopole phasing configuration.

It remains to compare plasma potential variations with the Er variations (from
GPI) and with core Mo contents.

Physics Operator Summaries

Entered: Sep 5 2012 08:00:52:760AM

Author: Bill Rowan

Physop Summary for 1120904

The run was in support of MP708 "RF sheath rectification in plasmas heated with a field-aligned ICRF antenna," SL: R. Ochoukov and MP 682 "Continued studies of RF induced electric fields in the SOL" SL: J. Terry. This reversed field run consisted of a narrow z-scan and a broad current scan. The run may have been hampered by the failure of FMIT 1 since the experiment was designed to use the D-port antenna. See SL report.

The setup for the run was based on segment 1 from a recent shot (1120830032) and segment 2 from a much older reference shot (1110214016) which was developed in reversed field. The latter shot may contain a vertical instability (see below) Only the predictor recalibration was required for the latter shot. Flips not required.

The physics operation consisted of a narrow z-scan and a broad current scan. In the course of the z-scan, a disruption was generated by a vertical instability. That instability seemed to be apparent in the reference shot but did not always end in disruption. The remedy was to reduce the elongation by decreasing the inner and outer gaps.

The current scan included a few values between 0.6 MA and 1.2 MA. At reduced current, marfes were generated. The remedy was to reduce the density.

The RF was required to execute a complex stepped waveform which went well.

Score Card
01 no power test shot
27 plasma
-------
28 total

Session Leader Comments

Sep 4 2012 08:39:30:423AM 1120904001 Roman Ochoukov Shot 001: no power test shot.

Sep 4 2012 10:11:21:073AM 1120904002 Roman Ochoukov Requested: Establish reference shot 1110214016, reversed Bt = 5.45 T, Ip = 0.8 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.801 m (conformal to main limiter surface).

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: disruption at 0.54 s

All four emissive probes appear working.

Next: repeat

Sep 4 2012 10:37:05:243AM 1120904003 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.8 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.801 m (conformal to main limiter surface).

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot

Fairly low ICRF-enhanced plasma potentials, < 50 V. Phi_P below midplane > Phi_p above midplane. Signal is strongest during FA-J pulse (up to about 40 V).

D antenna no longer available

Next: repeat, but with E antenna taking place of D antenna. RSSS_local = 0.810 m

Sep 4 2012 11:05:27:680AM 1120904004 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.8 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot

Fairly low ICRF-enhanced plasma potentials, < 50 V. Phi_P below midplane > Phi_p above midplane. Results between LA and SSS are similar (~same field line position): Phi_p up to ~40 V during FA-J at max power.

Next: repeat.

Sep 4 2012 11:04:30:683AM 1120904005 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.8 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot

Fairly low ICRF-enhanced plasma potentials, < 50 V. Phi_P below midplane > Phi_p above midplane. Results between LA and SSS are similar (~same field line position): Phi_p up to ~40 V during FA-J at max power.

Results are similar to shot 004, reproducibility is good.

Next: repeat but shift the Z position of the plasma down by ~2 mm.

Sep 4 2012 11:19:43:450AM 1120904006 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.8 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot

Potentials are similar to 005

Next: repeat but shift the Z position of the plasma up by ~1 mm with respect
to the last shot

Sep 4 2012 11:31:01:910AM 1120904007 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.8 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot

fixed probe above midplane (UA) showing some rectification (+30 Volts or so) but
only during the E antenna part of the shot.

Next: repeat but shift the Z position of the plasma up by ~3 mm with respect
to the last shot.

Sep 4 2012 11:47:33:943AM 1120904008 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.8 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot

The ICRF-enhanced potentials are fairly low on all the probes
(Max voltages are <50 V). Will need to compare to Er cells from the GPI.

Next: repeat but shift the Z position of the plasma up by ~2 mm with respect
to the last shot.

Sep 4 2012 11:55:12:003AM 1120904009 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.8 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: disruption at 0.51 s.

Next: repeat without disrupting.

Sep 4 2012 12:19:51:340PM 1120904010 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.8 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot
again, icrf-enhanced potentials are very low (<50 V) on all emissive probes.

Next: repeat shot 004 but with modified RF pulses (FA-J and E ramps at 0.55-0.85 s followed by FA-J ramp at 0.9-1.15 s).

Sep 4 2012 12:49:33:743PM 1120904011 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.8 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: disruption at 0.89 s. Got one full rf pulse in.
Again, ICRF-enhanced potentials only reach ~50 V max.

Next: repeat but decrease the inner gap by a couple of mm to make the plasma
"fatter" at the midplane and more vertically stable.
RSSS_local = 0.820 m

Sep 4 2012 01:10:24:993PM 1120904012 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.8 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.820 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: disruption at 0.59 s.

Next: repeat without disrupting.

Sep 4 2012 01:36:44:180PM 1120904013 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.8 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.820 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot.

ICRF-enhancement up to ~50 V during the two RF pulses (below midplane).
E antenna appears not to be doing much, need to compare to GPI Er fields.

Next: repeat.

Sep 4 2012 01:39:43:337PM 1120904014 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.8 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.820 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: fizzle.

Next: repeat but lower Z plasma by 4-5 mm, RSSS_local = 0.809 m

Sep 4 2012 01:53:03:703PM 1120904015 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.8 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot.
Plasma potentials reach +40 V during RF pulses, highest during max RF power.
Potentials go up to ~+40 V above the midplane too now.
FA-J is the major "enhancer" of the potentials.

Next: repeat but lower Z plasma by another 4-5 mm

Sep 4 2012 02:04:01:790PM 1120904016 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.8 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot.
Plasma potentials reach +30 V during RF pulses, highest during max RF power.
Potentials go up to ~+40 V above the midplane, same for FA-J and E power.

Next: repeat but lower Z plasma by a few more mm

Sep 4 2012 02:15:00:810PM 1120904017 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.8 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot.

similar results to previous shot.

Next: repeat but Ip to 0.6 MA, antennas run sequentially

Sep 4 2012 02:42:49:143PM 1120904018 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.6 MA,
nl04 = 0.9, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot, with a MARFE.

Enhanced potentials go up to 50-60 V during FA-J pulse, above and below midplane.
Good correlations to fast wave intensity for probes above and below midplane.

Next: repeat but lower nl04 to ~0.7x10^20 m^-2

Sep 4 2012 02:58:00:510PM 1120904019 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.6 MA,
nl04 = 0.7, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot with a MARFE.

Enhanced potentials go up to 150 V now above the midplane and up to
100 V below the midplane.

Next: repeat but lower nl04 to ~0.5x10^20 m^-2, raise Ip to 0.7 MA

Sep 4 2012 03:07:50:793PM 1120904020 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.7 MA,
nl04 = 0.5, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot.

Enhanced potentials go up to +50 V now above and below the midplane.

Next: repeat but raise Ip to 1.0 MA

Sep 4 2012 03:19:39:523PM 1120904021 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 1.0 MA,
nl04 = 0.5, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot.

Enhanced potentials go up to +50 V now above and below the midplane.
Occasional spikes to ~+100 V above the midplane, otherwise stays below +50 V.

Next: repeat but raise Ip to 1.2 MA, nl04 to 0.7x10^20 m^-2.

Sep 4 2012 03:41:49:073PM 1120904022 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 1.2 MA,
nl04 = 0.7, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot.

Enhanced potentials go up to +150 V during FA-J heated phase but only above
midplane. Enhanced potentials stay below +50 V on probes below midplane.
Clear "RF cell" structures on the ASP scanning emissive probe.

Next: repeat but with FA-J in monopole phasing.

Sep 4 2012 03:59:43:767PM 1120904023 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 1.2 MA,
nl04 = 0.7, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot.

Enhanced potentials go up to +300 V during FA-J monopole "heated" phase but only
above midplane.

Clear "RF cell" structures on the ASP scanning emissive probe with Er reversals
@ Rmid = 0.95 and 0.92 m (main limiter is @ Rmid = 0.91 m)

Next: repeat but with regular FA-J phasing.

Sep 4 2012 04:14:14:250PM 1120904024 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 1.2 MA,
nl04 = 0.7, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot.

Enhanced potentials go up to +150 V during FA-J heated phase but only
above midplane.

Monopole phasing is clearly the worst offender in inducing the largest
potential enhancement.

Next: repeat but @ Ip = 1.0 MA, normal FA-J phasing.

Sep 4 2012 04:25:59:480PM 1120904025 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 1.0 MA,
nl04 = 0.7, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.809 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot.

Enhanced potentials are now <100 V during FA-J heated phase and higher above
the midplane.

The "RF-cell" structures are no longer as well-defined as at 1.2 MA.

Next: repeat but with monopole FA-J phasing.

Sep 4 2012 04:42:37:603PM 1120904026 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 1.0 MA,
nl04 = 0.7, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.800 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: disruption @0.85 s but got full FA-J rf phase.

Enhanced potentials are now <100 V during FA-J heated monopole phase and
similar potentials below and above the midplane.

Next: repeat with monopole FA-J phasing, ip = 0.7 MA, nl04 = 0.5x10^20 m^-2.

Sep 4 2012 04:56:17:187PM 1120904027 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.7 MA,
nl04 = 0.5, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.802 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: full length shot but FA-J is trippy.

Next: repeat, likely the last shot of the day.

Sep 4 2012 05:14:54:920PM 1120904028 Roman Ochoukov Requested: reversed Bt = 5.45 T, Ip = 0.7 MA,
nl04 = 0.5, LSN.

All four emissive probes are on (LA, UA, SSS and ASP).
SSS parked at Rlocal = 0.802 m.

GPI acquisition from 0.55 to 1.15 s.

Three ASP plunges at 0.70, 1.05 and 1.40 s.

Results: disruption @0.96 s. Plasma potentials only reach ~50 V during FA-J monopole (above the midplane).

Next: EoR.

Physics Operator Comments

Sep 4 2012 09:38:13:293AM Bill Rowan PCS setup for the run

Load 1120830032, use for segment 1

Import segment 2 from 1110214016 with label 2011 0.8 MA SNL Rev-Field
Previously compared all v's and all p's for this segment to assure that the wires had polarities which are consistent with a recent reversed field shot. Concluded that no polarity ("flip")changes in all p's or all v's are needed. Made none.

For segment 2, recalulated the predictors to allow for coil issues
RCUR, ZCUR, RXL, ZXL, RXU, ZXU,B21_PROJ

Recalculated the B21_PROJ predictor as described in step 2 of physop notes for reversed field operation (August 17, 2012)

Increased BT from 5.47 T to 5.5 T (150000 to 150822)
Increased nl_04 demand from 0.5e+20 to 0.9e+20

Changed B-side lower fill to 2 psi neon
Changed H-bot fill to 1 psi argon

Sep 4 2012 09:42:13:243AM 1120904001 Bill Rowan 001. No power shot

Sep 4 2012 10:14:38:877AM 1120904002 Bill Rowan 002.
plasma
disruption at 0.5 s
BT = 5.39 T
nl_04 at 0.8e+20 before disruption

Next shot.
add 2 ms to prefill
increased backporch on PG3

Sep 4 2012 10:35:29:640AM 1120904003 Bill Rowan 003.
plasma full length and through ramp down
BT = 5.4 T
nl_04 oscillating in the vicinity of 0.9e+20
FMIT 1 no longer available. See RF entry

next shot.
small reduction in backporch of pg3
no additional pcs changes
Switching from D to E antenna for the experiment

Sep 4 2012 10:47:12:313AM 1120904004 Bill Rowan 004.
plasma full length

Next shot.
No pcs changes

Sep 4 2012 10:59:06:787AM 1120904005 Bill Rowan 005.
plasma full length
nl_04 is following the RF ramp
nl_04 level without RF is approx 0.96e+20

next shot
Move zcur down from -0.009 to -0.011, request of SL

Sep 4 2012 11:21:23:800AM 1120904006 Bill Rowan 006.
plasma, full length

Next shot
Move back up -- intermediate between 006 and 005

Sep 4 2012 11:30:07:080AM 1120904007 Bill Rowan 007.
Plasma full length

next shot.
move zcur up by 3 mm

Sep 4 2012 12:17:59:193PM 1120904009 Bill Rowan 009.
plasma
disruption at 0.5 s

next shot.
reload shot 004

Sep 4 2012 12:55:10:203PM 1120904012 Bill Rowan 012.
plasma disruption at 0.6 s

next shot
additional reduction in the inner gap

Sep 4 2012 01:36:11:277PM 1120904014 Bill Rowan 014,
plasma
disruption at 30 or 40 ms
breakdown looked okay.

next shot.
lower zcur from -0.009 to -0.01
returned pg3 backporch to where we started the day
reduced pg4 by 1 ms to 21 ms

Sep 4 2012 01:50:56:033PM 1120904015 Bill Rowan 015.
plasma full length
right gap = 1.6
left gap = 0.9

next shot.
enable h-bottom. on from 0.3 to 0.36 s
SL wants to go lower still. Reduce zcur from -.010 to --0.013

Sep 4 2012 02:21:41:713PM 1120904017 Bill Rowan 017.
plasma full length

next shot.
zcur back to the value of shot 016, zcur = -0.013
ip decreased from 0.8 MA to 0.6 MA
small change in rcur to decrease the outer gap by 3 mm after 1.4 s

Sep 4 2012 02:36:44:310PM 1120904018 Bill Rowan 018.
plasma full length

next shot.
zcur changed from -0.013 to -0.009
nl_04 changed from 0.9e+20 to 0.7e+20
change in outer gap satisfies LH for the moment

Sep 4 2012 02:45:48:203PM 1120904019 Bill Rowan 019.
plasma full length
marfe at 0.65

next shot
nl_04 changed from 0.7e+20 to 0.5e+20

Sep 4 2012 02:47:21:147PM 1120904019 Bill Rowan 019.
plasma full length
marfe at 0.65

next shot
nl_04 changed from 0.7e+20 to 0.5e+20
ip changed from 0.6 MA to 0.7 MA

Sep 4 2012 03:04:19:357PM 1120904020 Bill Rowan 020.
plasma full length
no marfes

next shot
ip changed from 0.7 MA to 1.0 MA

Sep 4 2012 03:16:22:273PM 1120904021 Bill Rowan 021.
plasma full length

next shot.
IP increased from 1.0 MA to 1.2 MA
nl_04 increased from 0.5e+20 to 0.7e+20

Sep 4 2012 03:35:16:720PM 1120904022 Bill Rowan 022.
plasma full length

next shot
Repeat for antenna phasing

Sep 4 2012 03:59:34:040PM 1120904023 Bill Rowan 023.
plasma

next shot
repeat for antenna phasing

Sep 4 2012 04:05:07:537PM 1120904024 Bill Rowan 024.
plasma

next shot
Ip reduced from 1.2 MA to 1.0 MA

Sep 4 2012 04:22:00:707PM 1120904025 Bill Rowan 025.
plasma

next shot
repeat for antenna phasing

Sep 4 2012 04:39:26:220PM 1120904026 Bill Rowan 026.
plasma
disruption at 0.85 s

next shot.
repeat shot 1120904020

Sep 4 2012 05:04:07:187PM 1120904027 Bill Rowan 027.
plasma

next shot
Repeat

Sep 4 2012 05:03:51:747PM 1120904028 Bill Rowan 028
plasma
disrupted at 1 s
last shot

Engineering Operator Comments

Shot Time Type Status Comment

1 08:35:00:017AM Test Ok Shot cycle test

2 10:02:40:717AM Plasma Ok

3 10:17:57:450AM Plasma Ok

4 10:37:40:170AM Plasma Ok

5 10:50:20:547AM Plasma Ok

6 11:05:45:163AM Plasma Ok

7 11:21:07:557AM Plasma Ok

8 11:34:37:107AM Plasma Ok

9 11:47:55:517AM Plasma Ok

10 12:01:06:460PM Plasma Ok

11 12:27:26:460PM Plasma Ok

12 12:49:45:380PM Plasma Ok

13 01:14:34:533PM Plasma Ok

14 01:27:01:647PM Plasma Ok

15 01:40:07:683PM Plasma Ok

16 01:54:17:740PM Plasma Ok

17 02:07:55:497PM Plasma Ok

18 02:24:11:490PM Plasma Ok

19 02:40:21:940PM Plasma Ok

20 02:55:35:683PM Plasma Ok

21 03:11:19:517PM Plasma Ok

22 03:29:56:767PM Plasma Ok

23 03:46:38:790PM Plasma Ok

24 04:01:49:280PM Plasma Ok

25 04:16:35:153PM Plasma Ok

26 04:32:14:517PM Plasma Ok

27 04:45:25:183PM Plasma Ok

28 05:00:35:170PM Plasma Ok

System Availability

Sep 4 2012 08:34:34:037AM

System Available Comment Availability
Changed Owner Description Who Can
Change
Active MHD no secured - tagged out Jun 2 2008 11:03:58:433AM (sears) Joe Snipes Active MHD Antenna golfit
BES yes BES system is online Nov 22 2011 02:21:12:050PM (bespam) Bill Rowan Beam Emission Spectroscopy bespam,liao,rowan
Bolometers yes Midplane diodes functioning properly. Midplane bolometers working and calibrated. DIV bolometers installed but not yet toaster calibrated Apr 20 2012 09:57:29:520AM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization yes Jun 15 2012 05:02:46:313PM (dekow) Jim Irby Boronization dekow,irby
CECE yes The system is currently operational for Te tilde measurement. Talk to Choongki about the current configuration Jul 3 2012 04:38:00:317PM (nthoward) Anne White Correlation ECE nthoward,sck83,whitea
CNPA yes Multiple channel CNPA available, no safety risk for in-vessel access Apr 14 2011 12:01:59:693PM (parker) Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor yes Jun 15 2012 05:02:31:550PM (dekow) Brian LaBombard Upper Divertor Cryopump dekow,irby,labombard
CXRS yes core-CXRS system is online Nov 22 2011 02:21:22:280PM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,liao,rachmcd,rowan
CXRS edge yes Michael CHurchill has primary responsibility at the moment Apr 19 2011 11:44:46:247AM (blip) Bruce Lipshultz Measurement of CXR light in the pedestal region at both the high- and low-field sides blip,rmchurch
D Alpha yes \ha2_bright is available; \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 is not available Jul 1 2009 09:45:41:090AM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa no system is is installed and aligned, but not functional (appears to be a broken cable) Dec 5 2011 02:41:42:867PM (marmar) Earl Marmar Visible Bremsstrahlung Imaging marmar
Disruption Mitigation yes two gas jet valves active as of Feb 2012 May 15 2012 10:09:23:597AM (granetz) Robert Granetz Gas Jet granetz,whyte
Divertor IR no Mar 6 2007 10:50:41:677AM Glen Wurden Divertor IR Digital Video gwurden,terry
Divertor IR Spectroscopy no Mar 6 2007 10:51:39:897AM Glen Wurden Divertor IR Spectroscopy gwurden,terry
DMBolo AXUV diodes yes Diodes are taking usable data. Not all post-processing code is working yet. Feb 1 2012 01:24:23:953PM (golynyk) Geoff Olynyk Set of six AXUV diodes in a toroidal array of midplane wall boxes. golynyk,granetz,mlreinke,whyte
DNB yes "The beam could break at any moment." May 15 2012 10:09:52:470AM (granetz) Robert Granetz Diagnostic Neutral Beam dterry,granetz,mochung
ECDC yes Apr 26 2012 03:23:19:057PM (dekow) Jim Irby 2.45 GHz, 3 kW, discharge cleaning system dekow,irby,pfeiffer
FRC-ECE yes FRC-ECE is online May 14 2012 11:53:01:693AM (bespam) Perry Phillips Heterodyne ECE-32 channels bespam,liao,phillips,rowan,whitea
FTCI yes System Operational May 14 2012 11:50:45:590AM (irby) Jim Irby Fast two-color interferometer irby
G-Side Ratiomatic yes Installed April 25,2012. New controller installed 5/29/2012 Jun 7 2012 10:40:00:957AM (toland) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
Glow Discharge no HV cables disconnected and power supplies off. Electrical plugs have been disconnected, capped and red tagged. Mar 5 2012 10:21:53:460AM (dekow) Jim Irby 1 kV, 5 A, glow discharge system dekow,dterry,irby
GPC yes Operational Apr 27 2012 07:41:46:907AM (hubbard) Amanda Hubbard ECE Polychromater hubbard
GPC2 yes Operational Apr 27 2012 07:42:03:317AM (hubbard) Amanda Hubbard ECE Polychromater hubbard
GPI yes The Xpt-view, the midplane-view cameras are operational. The innerwall GPI (coupled to the fast-diodes) is available. Jul 1 2009 09:45:50:933AM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes system is functional and taking data Dec 5 2011 02:42:29:857PM (marmar) Earl Marmar H/D Ratio marmar
HEAT yes Apr 26 2012 03:23:49:607PM (dekow) Gary Dekow - Machine Heaters - burke,dekow
Hirex Jr yes Hirex-Jr has been installed Jun 28 2010 03:36:33:420PM (rice) John Rice High Resolution X-Ray ince,rice
Hirex Sr yes Installed and aligned. Will be available for Ti/Vr profiles after focusing tests and locked modes are taken. Dec 6 2011 08:21:02:453AM (ypodpaly) John Rice High Resolution X-Ray cgao,ldelgado,rice,ypodpaly
HXR yes 32 Channels operational,, no safety risk for in-vessel access Apr 14 2011 12:05:24:810PM (parker) Ron Parker Hard X-Ray Array faust,parker,schmidt
ICRF D-Antenna yes May 31 2012 09:20:06:827AM (wukitch) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna yes May 31 2012 09:19:57:640AM (wukitch) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes May 31 2012 09:19:47:443AM (wukitch) Steve Wukitch J-port antenna wukitch,ylin
Impurity Spectroscopy yes Being upgraded with better optics and new spectrographs. Dan Miller has primary responsibility. Apr 19 2011 11:46:02:193AM (blip) Bruce Lipshultz Measurement of recycling light and impurity source rates at multiple surfaces around the tokamak blip,miller
Laser Blow-Off yes Pumped Down, Laser has not yet been tested but otherwise operational May 14 2012 04:31:17:037PM (nthoward) Martin Greenwald Impurity Injection System g,nthoward
Lower Hybrid yes LH is now available for plasma operation up to ~900 kW net power. Jul 3 2012 02:50:00:693PM (wallaceg) Ron Parker Lower Hybrid dterry,parker,wallaceg
Lower Hybrid Reflectometer no off Apr 15 2011 08:24:27:930AM (dominguez) Arturo Dominguez Lower Hybrid Reflectometer dominguez,marmar,parker,sgbaek
LoWEUS yes LoWEUS viewing the 10-30 nm region, spectral brightness vs. lambda and time are being stored in tree. Apr 20 2012 10:43:34:077AM (mlreinke) Matthew L. Reinke Long Wavelength Extreme Ultraviolet Spectrometer markchil,mlreinke
LPI no Beam line removed May 30 2008 02:09:12:833PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha no Midplane Lyman-a not functioning. New B-PORT Lyman (BPLY) still being debugged. Jul 12 2012 08:52:28:233AM (mlreinke) Matt Reinke Lyman alpha cameras faustian,labombard,mlreinke
Magnetics yes Dec 1 2011 11:51:51:970AM (g) Robert Granetz Bp coils and flux loops for equilibrium control granetz,wolfe
McPherson no McPherson under vacuum but is not run on a day-to-day basis. Can be requested if desired. LoWEUS has taken over as the primary Mo monitor. Jul 12 2012 08:53:14:937AM (mlreinke) Jim Terry VUV Spectrometer markchil,mlreinke,terry
Michelson yes Vacuum 3-4e-8 T. Starting with Michelson at reduced speed. Apr 27 2012 07:42:41:960AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt
MKS yes Dec 2 2011 12:27:47:163PM (toland) Brian LaBombard Baratron pressure gauges labombard,toland
MLP yes Operational. Connected to A-port probe system May 10 2012 08:40:19:910AM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard
MSE yes 2/29/2012 MSE operational. No HV or vacuum safety issues Feb 29 2012 12:26:13:863PM (sscott) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes Voltage is on for He3 detectors on J port. Remaining voltages will be turned on for the first run. Apr 23 2012 09:31:22:063AM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes All detectors Powered On --- Waiting for neutrons for calibration Nov 22 2011 01:05:24:380PM (irby) Jim Irby X-Ray/Neutron Detectors at K-Hor irby
NINJA yes C-bottom and new F-bottom system ready. Dec 2 2011 12:28:44:843PM (toland) Brian LaBombard NINJA gas puff labombard,terry,toland
PCI yes Operational. Jul 10 2012 07:08:06:883PM (ntsujii) Miklos Porkolab Phase Contrast Imaging emd,ennever,ntsujii,porkolab
Penning Gauges yes HV power supplies turned ON in INIT, off in RECOOL May 10 2012 08:41:03:000AM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. Jul 1 2009 09:46:29:543AM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe
Polarimeter yes 3 chords operational but with high noise level Jan 6 2012 04:22:20:903PM (irby) Jim Irby C-Mod Polarimeter irby
Power - Alternator Air Switch yes Apr 26 2012 03:24:21:607PM (dekow) Gary Dekow Alternator to Power Room Power Supply Connection cochran,dekow,dterry,irby
Power - PEI yes Apr 26 2012 03:24:41:250PM (dekow) Gary Dekow PEI System cochran,dekow,dterry,irby
Power - TMX yes Apr 26 2012 03:24:57:153PM (dekow) Gary Dekow Ef2s,. EFCs and A-Coils byford,cochran,dekow,dterry,irby
Power Systems yes Apr 26 2012 03:25:14:497PM (dekow) Jim Irby C-Mod Magnet Supplies byford,cochran,dekow,dterry,irby
Probe Array - ISD yes Operational. Some dead probes. May 10 2012 08:41:58:120AM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes Operational. 4 out of 6 probes working. May 10 2012 08:41:40:557AM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes Operational. May 10 2012 08:42:13:733AM (labombard) Brian LaBombard Outer Lower Divertor Probe Array (F and J) labombard
Probe Array - UDIV yes Operational. Some dead probes. May 10 2012 08:42:32:663AM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes On 1120608, the high frequency channels: 112, 140 and the variable, have been disconnected for some troubleshooting. All other channels are connected Jun 14 2012 11:28:59:603AM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Operational. A variety of probe heads are ready for use. May 10 2012 08:43:10:937AM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes Operational. May 10 2012 08:43:24:887AM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP no Not functioning. Probe tips are melted. Repair not performed during break. May 10 2012 08:44:43:137AM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
Shoelace Antenna yes Operational May 10 2012 08:45:08:320AM (labombard) Brian LaBombard High-k active MHD antenna, for QCM, WCM studies golfit,labombard
SOL reflectometer yes c-port (top, middle, bottom) and h-port available. Only 1 of 4 locations can be used for each discharge May 1 2012 04:54:58:820PM (cornwall) Cornwall Lau SOL reflectometer cornwall,wukitch,ylin
Sparker yes Sparker Power Supply powered up. Connected at K port using red cable 4/23/12 9:25AM Apr 23 2012 12:06:10:983PM (parkin) Jim Irby Field Emission Preionization for C-Mod dekow,irby,parkin
Surface Science Station yes SSS is under vacuum and fully available. Jul 3 2012 02:46:59:753PM (ochoukov) Bruce Lipschultz Radially scanning probe located on K-port blip,ochoukov
TCI yes TCI lasers in operation May 14 2012 11:51:18:700AM (irby) Jim Irby Two-Color Interferometer irby,murray
TS - Core yes Operating with both lasers, density calibration ongoing. Jul 19 2012 10:20:09:220AM (jrwalk) Jerry Hughes Core Thomson scattering jrwalk,jwhughes,yma
TS - Edge yes Operating with both lasers, density calibration ongoing. Jul 19 2012 10:20:28:323AM (jrwalk) Jerry Hughes Millimeter resolution edge Thomson scattering jrwalk,jwhughes,yma
Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58:35:493AM (agraf) Alex Graf Visible Spectrometer agraf
XEUS yes XEUS viewing the 1-6 nm region, spectral brightness vs. lambda and time are being stored in tree. Apr 20 2012 10:43:43:107AM (mlreinke) Matt Reinke X-ray Extended Ultraviolet Spectrometer markchil,mlreinke
XTOMO yes ARRAY1->5 available. Specific channels on various arrays display issues. Apr 20 2012 05:36:28:523PM (faustian) Robert Granetz X-Ray Tomography faustian,granetz,mlreinke

Session Leader Comments
Sep 4 2012 08:39:30:423AM	1120904001	Roman Ochoukov	Shot 001: no power test shot.
Sep 4 2012 10:11:21:073AM	1120904002	Roman Ochoukov	Requested: Establish reference shot 1110214016, reversed Bt = 5.45 T, Ip = 0.8 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.801 m (conformal to main limiter surface). GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: disruption at 0.54 s All four emissive probes appear working. Next: repeat
Sep 4 2012 10:37:05:243AM	1120904003	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.8 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.801 m (conformal to main limiter surface). GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot Fairly low ICRF-enhanced plasma potentials, < 50 V. Phi_P below midplane > Phi_p above midplane. Signal is strongest during FA-J pulse (up to about 40 V). D antenna no longer available Next: repeat, but with E antenna taking place of D antenna. RSSS_local = 0.810 m
Sep 4 2012 11:05:27:680AM	1120904004	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.8 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot Fairly low ICRF-enhanced plasma potentials, < 50 V. Phi_P below midplane > Phi_p above midplane. Results between LA and SSS are similar (~same field line position): Phi_p up to ~40 V during FA-J at max power. Next: repeat.
Sep 4 2012 11:04:30:683AM	1120904005	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.8 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot Fairly low ICRF-enhanced plasma potentials, < 50 V. Phi_P below midplane > Phi_p above midplane. Results between LA and SSS are similar (~same field line position): Phi_p up to ~40 V during FA-J at max power. Results are similar to shot 004, reproducibility is good. Next: repeat but shift the Z position of the plasma down by ~2 mm.
Sep 4 2012 11:19:43:450AM	1120904006	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.8 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot Potentials are similar to 005 Next: repeat but shift the Z position of the plasma up by ~1 mm with respect to the last shot
Sep 4 2012 11:31:01:910AM	1120904007	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.8 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot fixed probe above midplane (UA) showing some rectification (+30 Volts or so) but only during the E antenna part of the shot. Next: repeat but shift the Z position of the plasma up by ~3 mm with respect to the last shot.
Sep 4 2012 11:47:33:943AM	1120904008	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.8 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot The ICRF-enhanced potentials are fairly low on all the probes (Max voltages are <50 V). Will need to compare to Er cells from the GPI. Next: repeat but shift the Z position of the plasma up by ~2 mm with respect to the last shot.
Sep 4 2012 11:55:12:003AM	1120904009	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.8 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: disruption at 0.51 s. Next: repeat without disrupting.
Sep 4 2012 12:19:51:340PM	1120904010	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.8 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot again, icrf-enhanced potentials are very low (<50 V) on all emissive probes. Next: repeat shot 004 but with modified RF pulses (FA-J and E ramps at 0.55-0.85 s followed by FA-J ramp at 0.9-1.15 s).
Sep 4 2012 12:49:33:743PM	1120904011	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.8 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: disruption at 0.89 s. Got one full rf pulse in. Again, ICRF-enhanced potentials only reach ~50 V max. Next: repeat but decrease the inner gap by a couple of mm to make the plasma "fatter" at the midplane and more vertically stable. RSSS_local = 0.820 m
Sep 4 2012 01:10:24:993PM	1120904012	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.8 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.820 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: disruption at 0.59 s. Next: repeat without disrupting.
Sep 4 2012 01:36:44:180PM	1120904013	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.8 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.820 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot. ICRF-enhancement up to ~50 V during the two RF pulses (below midplane). E antenna appears not to be doing much, need to compare to GPI Er fields. Next: repeat.
Sep 4 2012 01:39:43:337PM	1120904014	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.8 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.820 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: fizzle. Next: repeat but lower Z plasma by 4-5 mm, RSSS_local = 0.809 m
Sep 4 2012 01:53:03:703PM	1120904015	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.8 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot. Plasma potentials reach +40 V during RF pulses, highest during max RF power. Potentials go up to ~+40 V above the midplane too now. FA-J is the major "enhancer" of the potentials. Next: repeat but lower Z plasma by another 4-5 mm
Sep 4 2012 02:04:01:790PM	1120904016	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.8 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot. Plasma potentials reach +30 V during RF pulses, highest during max RF power. Potentials go up to ~+40 V above the midplane, same for FA-J and E power. Next: repeat but lower Z plasma by a few more mm
Sep 4 2012 02:15:00:810PM	1120904017	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.8 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot. similar results to previous shot. Next: repeat but Ip to 0.6 MA, antennas run sequentially
Sep 4 2012 02:42:49:143PM	1120904018	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.6 MA, nl04 = 0.9, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot, with a MARFE. Enhanced potentials go up to 50-60 V during FA-J pulse, above and below midplane. Good correlations to fast wave intensity for probes above and below midplane. Next: repeat but lower nl04 to ~0.7x10^20 m^-2
Sep 4 2012 02:58:00:510PM	1120904019	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.6 MA, nl04 = 0.7, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot with a MARFE. Enhanced potentials go up to 150 V now above the midplane and up to 100 V below the midplane. Next: repeat but lower nl04 to ~0.5x10^20 m^-2, raise Ip to 0.7 MA
Sep 4 2012 03:07:50:793PM	1120904020	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.7 MA, nl04 = 0.5, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot. Enhanced potentials go up to +50 V now above and below the midplane. Next: repeat but raise Ip to 1.0 MA
Sep 4 2012 03:19:39:523PM	1120904021	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 1.0 MA, nl04 = 0.5, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot. Enhanced potentials go up to +50 V now above and below the midplane. Occasional spikes to ~+100 V above the midplane, otherwise stays below +50 V. Next: repeat but raise Ip to 1.2 MA, nl04 to 0.7x10^20 m^-2.
Sep 4 2012 03:41:49:073PM	1120904022	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 1.2 MA, nl04 = 0.7, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot. Enhanced potentials go up to +150 V during FA-J heated phase but only above midplane. Enhanced potentials stay below +50 V on probes below midplane. Clear "RF cell" structures on the ASP scanning emissive probe. Next: repeat but with FA-J in monopole phasing.
Sep 4 2012 03:59:43:767PM	1120904023	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 1.2 MA, nl04 = 0.7, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot. Enhanced potentials go up to +300 V during FA-J monopole "heated" phase but only above midplane. Clear "RF cell" structures on the ASP scanning emissive probe with Er reversals @ Rmid = 0.95 and 0.92 m (main limiter is @ Rmid = 0.91 m) Next: repeat but with regular FA-J phasing.
Sep 4 2012 04:14:14:250PM	1120904024	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 1.2 MA, nl04 = 0.7, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot. Enhanced potentials go up to +150 V during FA-J heated phase but only above midplane. Monopole phasing is clearly the worst offender in inducing the largest potential enhancement. Next: repeat but @ Ip = 1.0 MA, normal FA-J phasing.
Sep 4 2012 04:25:59:480PM	1120904025	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 1.0 MA, nl04 = 0.7, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.809 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot. Enhanced potentials are now <100 V during FA-J heated phase and higher above the midplane. The "RF-cell" structures are no longer as well-defined as at 1.2 MA. Next: repeat but with monopole FA-J phasing.
Sep 4 2012 04:42:37:603PM	1120904026	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 1.0 MA, nl04 = 0.7, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.800 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: disruption @0.85 s but got full FA-J rf phase. Enhanced potentials are now <100 V during FA-J heated monopole phase and similar potentials below and above the midplane. Next: repeat with monopole FA-J phasing, ip = 0.7 MA, nl04 = 0.5x10^20 m^-2.
Sep 4 2012 04:56:17:187PM	1120904027	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.7 MA, nl04 = 0.5, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.802 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: full length shot but FA-J is trippy. Next: repeat, likely the last shot of the day.
Sep 4 2012 05:14:54:920PM	1120904028	Roman Ochoukov	Requested: reversed Bt = 5.45 T, Ip = 0.7 MA, nl04 = 0.5, LSN. All four emissive probes are on (LA, UA, SSS and ASP). SSS parked at Rlocal = 0.802 m. GPI acquisition from 0.55 to 1.15 s. Three ASP plunges at 0.70, 1.05 and 1.40 s. Results: disruption @0.96 s. Plasma potentials only reach ~50 V during FA-J monopole (above the midplane). Next: EoR.

Physics Operator Comments
Sep 4 2012 09:38:13:293AM		Bill Rowan	PCS setup for the run Load 1120830032, use for segment 1 Import segment 2 from 1110214016 with label 2011 0.8 MA SNL Rev-Field Previously compared all v's and all p's for this segment to assure that the wires had polarities which are consistent with a recent reversed field shot. Concluded that no polarity ("flip")changes in all p's or all v's are needed. Made none. For segment 2, recalulated the predictors to allow for coil issues RCUR, ZCUR, RXL, ZXL, RXU, ZXU,B21_PROJ Recalculated the B21_PROJ predictor as described in step 2 of physop notes for reversed field operation (August 17, 2012) Increased BT from 5.47 T to 5.5 T (150000 to 150822) Increased nl_04 demand from 0.5e+20 to 0.9e+20 Changed B-side lower fill to 2 psi neon Changed H-bot fill to 1 psi argon
Sep 4 2012 09:42:13:243AM	1120904001	Bill Rowan	001. No power shot
Sep 4 2012 10:14:38:877AM	1120904002	Bill Rowan	002. plasma disruption at 0.5 s BT = 5.39 T nl_04 at 0.8e+20 before disruption Next shot. add 2 ms to prefill increased backporch on PG3
Sep 4 2012 10:35:29:640AM	1120904003	Bill Rowan	003. plasma full length and through ramp down BT = 5.4 T nl_04 oscillating in the vicinity of 0.9e+20 FMIT 1 no longer available. See RF entry next shot. small reduction in backporch of pg3 no additional pcs changes Switching from D to E antenna for the experiment
Sep 4 2012 10:47:12:313AM	1120904004	Bill Rowan	004. plasma full length Next shot. No pcs changes
Sep 4 2012 10:59:06:787AM	1120904005	Bill Rowan	005. plasma full length nl_04 is following the RF ramp nl_04 level without RF is approx 0.96e+20 next shot Move zcur down from -0.009 to -0.011, request of SL
Sep 4 2012 11:21:23:800AM	1120904006	Bill Rowan	006. plasma, full length Next shot Move back up -- intermediate between 006 and 005
Sep 4 2012 11:30:07:080AM	1120904007	Bill Rowan	007. Plasma full length next shot. move zcur up by 3 mm
Sep 4 2012 12:17:59:193PM	1120904009	Bill Rowan	009. plasma disruption at 0.5 s next shot. reload shot 004
Sep 4 2012 12:55:10:203PM	1120904012	Bill Rowan	012. plasma disruption at 0.6 s next shot additional reduction in the inner gap
Sep 4 2012 01:36:11:277PM	1120904014	Bill Rowan	014, plasma disruption at 30 or 40 ms breakdown looked okay. next shot. lower zcur from -0.009 to -0.01 returned pg3 backporch to where we started the day reduced pg4 by 1 ms to 21 ms
Sep 4 2012 01:50:56:033PM	1120904015	Bill Rowan	015. plasma full length right gap = 1.6 left gap = 0.9 next shot. enable h-bottom. on from 0.3 to 0.36 s SL wants to go lower still. Reduce zcur from -.010 to --0.013
Sep 4 2012 02:21:41:713PM	1120904017	Bill Rowan	017. plasma full length next shot. zcur back to the value of shot 016, zcur = -0.013 ip decreased from 0.8 MA to 0.6 MA small change in rcur to decrease the outer gap by 3 mm after 1.4 s
Sep 4 2012 02:36:44:310PM	1120904018	Bill Rowan	018. plasma full length next shot. zcur changed from -0.013 to -0.009 nl_04 changed from 0.9e+20 to 0.7e+20 change in outer gap satisfies LH for the moment
Sep 4 2012 02:45:48:203PM	1120904019	Bill Rowan	019. plasma full length marfe at 0.65 next shot nl_04 changed from 0.7e+20 to 0.5e+20
Sep 4 2012 02:47:21:147PM	1120904019	Bill Rowan	019. plasma full length marfe at 0.65 next shot nl_04 changed from 0.7e+20 to 0.5e+20 ip changed from 0.6 MA to 0.7 MA
Sep 4 2012 03:04:19:357PM	1120904020	Bill Rowan	020. plasma full length no marfes next shot ip changed from 0.7 MA to 1.0 MA
Sep 4 2012 03:16:22:273PM	1120904021	Bill Rowan	021. plasma full length next shot. IP increased from 1.0 MA to 1.2 MA nl_04 increased from 0.5e+20 to 0.7e+20
Sep 4 2012 03:35:16:720PM	1120904022	Bill Rowan	022. plasma full length next shot Repeat for antenna phasing
Sep 4 2012 03:59:34:040PM	1120904023	Bill Rowan	023. plasma next shot repeat for antenna phasing
Sep 4 2012 04:05:07:537PM	1120904024	Bill Rowan	024. plasma next shot Ip reduced from 1.2 MA to 1.0 MA
Sep 4 2012 04:22:00:707PM	1120904025	Bill Rowan	025. plasma next shot repeat for antenna phasing
Sep 4 2012 04:39:26:220PM	1120904026	Bill Rowan	026. plasma disruption at 0.85 s next shot. repeat shot 1120904020
Sep 4 2012 05:04:07:187PM	1120904027	Bill Rowan	027. plasma next shot Repeat
Sep 4 2012 05:03:51:747PM	1120904028	Bill Rowan	028 plasma disrupted at 1 s last shot

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:35:00:017AM	Test	Ok	Shot cycle test
2	10:02:40:717AM	Plasma	Ok
3	10:17:57:450AM	Plasma	Ok
4	10:37:40:170AM	Plasma	Ok
5	10:50:20:547AM	Plasma	Ok
6	11:05:45:163AM	Plasma	Ok
7	11:21:07:557AM	Plasma	Ok
8	11:34:37:107AM	Plasma	Ok
9	11:47:55:517AM	Plasma	Ok
10	12:01:06:460PM	Plasma	Ok
11	12:27:26:460PM	Plasma	Ok
12	12:49:45:380PM	Plasma	Ok
13	01:14:34:533PM	Plasma	Ok
14	01:27:01:647PM	Plasma	Ok
15	01:40:07:683PM	Plasma	Ok
16	01:54:17:740PM	Plasma	Ok
17	02:07:55:497PM	Plasma	Ok
18	02:24:11:490PM	Plasma	Ok
19	02:40:21:940PM	Plasma	Ok
20	02:55:35:683PM	Plasma	Ok
21	03:11:19:517PM	Plasma	Ok
22	03:29:56:767PM	Plasma	Ok
23	03:46:38:790PM	Plasma	Ok
24	04:01:49:280PM	Plasma	Ok
25	04:16:35:153PM	Plasma	Ok
26	04:32:14:517PM	Plasma	Ok
27	04:45:25:183PM	Plasma	Ok
28	05:00:35:170PM	Plasma	Ok