Alcator C-Mod Run 1031216 Information

Miniproposals

Miniproposal: 355

Date Filed: 11/12/2003

Title: ICRF Testing & Conditioning

First Author: Steve Wukitch

Session Leader: Steve Wukitch (shots 1-7)

Miniproposal: 377

Date Filed: 11/26/2003

Title: Energy confinement in double-null discharges

First Author: Dale Meade

Session Leader: Dale Meade (shots 8-21)

Session Leader: Earl Marmar (shots 8-21)

Operators
Session leader(s):	Steve Wukitch,Earl Marmar,Dale Meade
Physics operator(s):	Robert Granetz
Engineering operator(s):	Ed Fitzgerald,Bill Parkin,Gary Dekow

Engineering Operator Run Comment
MP 355 ICRF & MP 377; SL:Wukitch, Marmar PO:Granetz EO:Dekow/Fitz/Parkin

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:35:460PM

Author: Earl Marmar

Engineering setup for Tuesday, 16 Dec 2003

MP 355 ICRF post-boron conditioning
MP 377 Energy confinement in double-null (standby)

Session leader: S. Wukitch (MP 355), E. Marmar (MP 377)
Physics operator: R. Granetz

ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00.
Bake at 60 C overnight as well.

*********
* NOTE: * Run begins at 08:00 and ends at 15:00, due to the PSFC holiday party.
********* ----- -----

Power systems the same as on 1031204037 (fiducial discharge, 1.0 MA, 5.4 T,
lower single null).

A-coils should be hooked up as on 1031204037 (+Dtop -Dbot -Jtop +Jbot), and
the power supply should be enabled.

Gas setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid enabled (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill C-side with 30 psi D2 Hybrid enabled (PG3)

Enable the following gate valves, assuming no vacuum problems:
ECE, VUV, DNB

-------------------------------------------------------------------------------
RF Setup: All 4 transmitters in Run On by 07:00 (note earlier time)

-------------------------------------------------------------------------------
Run Plan:

Boronization recovery: using the 1 MA fiducial shot (1031204037), get all
the transmitters/antennas going again at full power.

If that goes as fast as last time, then we will change to double null
plasmas and take up where we left off on MP 377.
-------------------------------------------------------------------------------
NTP 003, 013, 018

001 BT~5.4 T, Ip~ 1 MA, nl04~0.8 - fiducial
D: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec
E: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec
J: 0.5, 1.0, 1.5, 2. MW steps [0.6,1.5]sec
result: plasma
D: ran
E: ran
J: did not run - no bira demand
002 BT~5.4T, Ip~1 MA, nl04~0.8 - fiducial
D: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec
E: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec
J: 0.5, 1.0, 1.5, 2. MW steps [0.6,1.5]sec
result: plasma
D: ran
E: ran 1 fault
J: ran no J3
004 BT~5.4T, Ip~1 MA, nl04~0.8 - fiducial
D: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec
E: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec
J: 0.5, 1.0, 1.5, 2. MW steps [0.6,1.5]sec
result: plasma
D: ran
E: ran
J: ran 9 faults
005 BT~5.4T, Ip~1 MA, nl04~0.8 - fiducial
D: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec
E: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec
J: 0.5, 1.0, 1.5, 2. MW steps [0.6,1.5]sec
result: plasma
D: ran 2 faults
E: ran
J: ran 2 faults
006 BT~5.4T, Ip~1 MA, nl04~0.8 - fiducial plasma with constant RF power
D: 1.0 MW [0.6,1.5]sec
E: 1.0 MW [0.6,1.5]sec
J: 2.0 MW [0.6,1.5]sec
result: plasma
D: ran 7 faults
E: ran
J: ran 6 faults
next shot: repeat
007 BT~5.4T, Ip~1 MA, nl04~0.8 - fiducial plasma with constant RF power
D: 1.0 MW [0.6,1.5]sec
E: 1.0 MW [0.6,1.5]sec
J: 2.0 MW [0.6,1.5]sec
result: plasma
D: ran 7 faults
E: ran
J: ran
next shot: move to MP 377 1031211016

Run Summary

We did no vacuum conditioning on D-port antenna but its recovery was
not remarkably worse than E-port. We had data problems on J-port for
001-004 and these have been fixed (001 had no J-port, 002 had no J3,
and 003 was NTP). Otherwise the recovery was fairly painless.

When F-side neutral pressure reached 0.3 we started to have more
faulting on all antennas but particularly D and J-port.

Physics Operator Summaries

Entered: Jul 7 2004 04:37:20:067PM

Author: Robert Granetz

Physics operator summary for run 1031216 (Tuesday):

MP 355 ICRF post-boron conditioning
MP 377 Energy confinement in double-null (standby)

Session leader: S. Wukitch (MP 355), E. Marmar (MP 377)
Physics operator: R. Granetz

Summary: Despite a slow start because of RF data acquisition and other
problems, the boronization recovery of both the machine and the RF
was quick, and MP 355 was declared done after shot 7. We then
switched to the double-null MP 377. We ran 1.0 and 1.2 MA, and
target densities from 0.8 to 1.4e20 m-2. The machine continued to
run very well, with only two fizzles. RF power got as high as 6 MW,
but J-port antenna does not run well at higher densities. See the
session leaders' summaries for physics learned on this MP.

There was a problem with the EF3 breaker on shot 3, which caused a
dud, and there was a TF crowbar at the end of shot 19, which blew
one fuse.

Scorecard: 18 plasmas
2 fizzles
1 dud
0 test or no-power shot cycle
0 aborted and/or screwed up by computer problems
----------
21 total

-------------------------------------------------------------------------------
Engineering setup for Tuesday, 16 Dec 2003

MP 355 ICRF post-boron conditioning
MP 377 Energy confinement in double-null (standby)

Session leader: S. Wukitch (MP 355), E. Marmar (MP 377)
Physics operator: R. Granetz

ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00.
Bake at 60 C overnight as well.

*********
* NOTE: * Run begins at 08:00 and ends at 15:00, due to the PSFC holiday party.
********* ----- -----

Power systems the same as on 1031204037 (fiducial discharge, 1.0 MA, 5.4 T,
lower single null).

A-coils should be hooked up as on 1031204037 (+Dtop -Dbot -Jtop +Jbot), and
the power supply should be enabled.

Gas setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid enabled (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill C-side with 30 psi D2 Hybrid enabled (PG3)

Enable the following gate valves, assuming no vacuum problems:
ECE, VUV, DNB

-------------------------------------------------------------------------------
RF Setup: All 4 transmitters in Run On by 07:00 (note earlier time)

-------------------------------------------------------------------------------
Run Plan:

Boronization recovery: using the 1 MA fiducial shot (1031204037), get all
the transmitters/antennas going again at full power.

If that goes as fast as last time, then we will change to double null
plasmas and take up where we left off on MP 377.

-------------------------------------------------------------------------------

Boronization was done last evening.
ECDC in helium was done overnight, but no 60 C bake.

Hybrid coldstart done by the engineering group; no errors found

Loaded PCS segment 1 from 1031212024 (most recent shot).
Loaded PCS segment 2 from 1031204037 (1 MA, 5.4 T fiducial).

-------------------------------------------------------------------------------

The start of the run will be delayed while the RF tries to get some vacuum
conditioning done. This will be followed by some ECDC in D2.

Shot 01 -- Plasma. Good shot. 1.0 MA fiducial. Bruce just informed me that
the gate valve should have been set to remained closed on the
fiducial, which was news to me. Prf=2+ MW (D and E). One H-mode.
Startup just barely made it.

Next shot: reduce pre-fill by 1 ms. Set main gate valve to remain
closed for 8 minutes after the shot (at Bruce's request).

Shot 02 -- Plasma. Another good shot. D and E are good; still no J-port
power. Longer H-mode. 120 kJ with 2.3 MW of RF. Zeff=1.5.
Very low carbon light during startup.

Next shot: repeat, no PCS changes

Shot 03 -- Dud. No EF3. Problem with EF3 breaker.

Next shot: repeat, no PCS changes

Shot 04 -- Plasma. Good shot. All three antenna systems are working, but the
data acquisition for J-port is not working, so we don't know how
much power it's radiating. It's presumably comparable to D and E,
which would make Prf about 4.5 MW. Two H-modes, with Wth=160 kJ.

Next shot: repeat, with slight tweak on Br_0

Shot 05 -- Plasma. Good shot. All antennas and transmitters are working.
Prf=4.5 MW. Long EDA H-mode.

Next shot: no PCS changes. RF will change from a stepped waveform
to a simple flat waveform at 4.5 MW

Shot 06 -- Plasma. Good shot. Prf=4.5 MW, but with lots of faulting on J3 and
J4.

Next shot: repeat, no PCS changes

Shot 07 -- Plasma. Good shot. Prf=4.6 MW, with some faulting on D. Success
declared on the boronization recovery (MP 355).

Next shot: load a recent double null shot (1031211016), except
keep segment 1 from the present shot, and begin MP 377.

NOTE: the active segment is #4 !!

Shot 08 -- Plasma. Good shot. Nearly double null, but actually more upper
single null. Disrupted halfway down the rampdown. Prf=4.6 MW,
with lots of faulting. RF pulse goes from t=0.6 to 1.0 s. H-mode.
Wth=170 kJ. Lots of large m=1/n=1 at the H-L backtransition.

Next shot: tweak the SSEP gain to remove the rampdown disruption.
RF programming is also being changed.

Shot 09 -- Plasma. Good shot. Ramped all the way down. Prf=4.5 MW until
t=1.0 s (with no faults), and then started ramping up to 6 MW, but
with lots of faulting on J3 and J4.

Next shot: no PCS change, but delay the RF pulse by 100 ms at the
request of John Rice.

Shot 10 -- Plasma. Good shot. RF looked the same, except for the 100 ms
shift.

Next shot: no PCS changes, but lower the J-port RF power by 50%.

Shot 11 -- Plasma. Good shot. Prf=3.3 MW flat, then ramping up to 6 MW with
only one fault. SSEP=+2 mm, kappa=1.73, delta_L=0.45, delta_U=0.65,
inner gap=2.0 cm, outer gap=1.1-1.4 cm. nl_04 (target)=0.9e20 m-2,
Ip=1.04 MA, Btor=5.4 T. Wth peaks at 190 kJ at peak RF power.

Next shot: repeat, no changes

Shot 12 -- Plasma. Good shot. There was a big chunk taken out of the plasma
current between t=0.1-0.2 s. Wth=200 kJ. Peak Rdd>1.0e14 s-1.

Next shot: no PCS changes; keep RF on for another 100 ms

Shot 13 -- Fizzle.

Next shot: reduce pre-fill gas puff by 1 ms

Shot 14 -- Plasma. Good shot. The RF pulse is lasting longer than the
current flattop.

Next shot: increase flattop to t=1.5 s (from 1.3 s).

Shot 15 -- Plasma. Good shot. Current flattop now goes to t=1.5 s. The Btor
flattop still needs to be extended, however. J-port trips out
at t=1.35 s.

Next shot: raise Ip to 1.25 MA and nl_04 to 1.0e20 m-2. Also extend
Btor flattop to t=1.5 s.

Shot 16 -- Plasma. Good shot. Ip=1.23 MA. Flattop goes to t=1.5 s. RF
doesn't like the higher density. nl_04=1.04e20 m-2. Much of the
engineering data did not come through, so no EFITs.

Next shot: increase nl_04 to 1.2e20 m-2

Shot 17 -- Plasma. Good shot. nl_04(target)=1.2e20 m-2. Ip=1.22 MA.

Next shot: reduce SSEP by 2 mm. Also reduce argon puff by 2 ms (at
John Rice's request!!)

Shot 18 -- Fizzle.

Next shot: reduce Br_0 by 0.5 mT. Also reduced argon puff by
another 10 ms (to 30 ms) at Earl's request.

Shot 19 -- Plasma. Good shot. TF crowbarred. This equilibrium was much more
"double-null"-like than previous shots today. Wth reaches 170 kJ.

Next shot: increase nl_04 to 1.4e20 m-2 and return SSEP to its
value before shot 19.

The next shot will be delayed while a fuse is changed.

Shot 20 -- Plasma. Good shot. Back to the slightly (magnetically) unbalanced
double null. nl_04(target)=1.4e20 m-2. J-port didn't go (because
of the higher density). Wth=130-140 kJ with Prf=2-3 MW.

Next shot: no changes

Shot 21 -- Plasma. Good shot. Pretty much a repeat of the previous shot.
J-port still didn't go. Wth=155 kJ, Prf=3 MW.

End of run

Session Leader Comments

Dec 16 2003 11:23:00:270AM 1031216001 Steve Wukitch 001 BT~5.4 T, Ip~ 1 MA, nl04~0.8 - fiducial
D: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec
E: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec
J: 0.5, 1.0, 1.5, 2. MW steps [0.6,1.5]sec
result: plasma
D: ran
E: ran
J: did not run - no bira demand

Dec 16 2003 11:22:45:690AM 1031216002 Steve Wukitch 002 BT~5.4T, Ip~1 MA, nl04~0.8 - fiducial
D: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec
E: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec
J: 0.5, 1.0, 1.5, 2. MW steps [0.6,1.5]sec
result: plasma
D: ran
E: ran 1 fault
J: ran no J3

Dec 16 2003 11:22:33:097AM 1031216003 Steve Wukitch 003 NTP

Dec 16 2003 11:20:43:943AM 1031216004 Steve Wukitch 004 BT~5.4T, Ip~1 MA, nl04~0.8 - fiducial
D: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec
E: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec
J: 0.5, 1.0, 1.5, 2. MW steps [0.6,1.5]sec
result: plasma
D: ran
E: ran
J: ran 9 faults

Dec 16 2003 11:00:45:513AM 1031216005 Steve Wukitch 005 BT~5.4T, Ip~1 MA, nl04~0.8 - fiducial
D: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec
E: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec
J: 0.5, 1.0, 1.5, 2. MW steps [0.6,1.5]sec
result: plasma
D: ran 2 faults
E: ran
J: ran 2 faults

Dec 16 2003 11:18:10:213AM 1031216006 Steve Wukitch 006 BT~5.4T, Ip~1 MA, nl04~0.8 - fiducial plasma with constant RF power
D: 1.0 MW [0.6,1.5]sec
E: 1.0 MW [0.6,1.5]sec
J: 2.0 MW [0.6,1.5]sec
result: plasma
D: ran 7 faults
E: ran
J: ran 6 faults
next shot: repeat

Dec 16 2003 11:31:55:977AM 1031216007 Steve Wukitch 007 BT~5.4T, Ip~1 MA, nl04~0.8 - fiducial plasma with constant RF power
D: 1.0 MW [0.6,1.5]sec
E: 1.0 MW [0.6,1.5]sec
J: 2.0 MW [0.6,1.5]sec
result: plasma
D: ran 7 faults
E: ran
J: ran
next shot: move to MP 377 1031211016

Dec 16 2003 11:52:33:750AM 1031216008 Dale Meade Meade just arrived. Shot 1031216008 was to be a repeat of 1031211016.

Dec 16 2003 11:53:30:703AM 1031216008 Earl Marmar switching to mp377 after boron recovery

start with reload of 1031211016, DN (SSEP ~ +0.2 cm)

plasma, some rf trips
Wmax = 177 kJ, H89 ~ 1.5 (but trips complicate interpreptation)

Dec 16 2003 12:03:44:470PM 1031216009 Dale Meade H89 = 1.64 at first h-mode

Dec 16 2003 12:05:36:377PM 1031216009 Earl Marmar repeat
plasma; steady RF

3 H-modes; looking ELM-free

3'rd H-Mode coming almost to a steady-state, H89 ~ 1.4
Wmax = 179 kJ

Dec 16 2003 12:35:00:483PM 1031216011 Dale Meade H89 = 1.56 for the first h-mode , the second H-mode is staedy at ~ 1.5

Dec 16 2003 12:56:07:303PM 1031216011 Earl Marmar lower RF power early (3 MW) then ramp up to 6 MW

first H-mode: Wmax = 164 kJ (3 MW), H89 ~ 1.6 (when dW/dt = 0)

Dec 16 2003 12:46:21:797PM 1031216012 Dale Meade The third H-mode was best H89 = 1.56 @ PRF = 6.14 MW

Dec 16 2003 12:53:19:947PM 1031216012 Earl Marmar repeat
plasma
3'rd H-mode with RF ramp to 6 MW gives H89 ~ 1.55, Wmax = 200 kJ

Dec 16 2003 01:51:45:893PM 1031216017 Earl Marmar 1.2 MA
Plasma

Wmax = 178 kJ, Prf = 3.4 MW

H89 ~ 1.34 (at dW/dt = 0)

Dec 16 2003 03:02:16:080PM 1031216020 Earl Marmar nl_04 target to 1.4e20

plasma; lower RF power (no J-port)
barely into H-mode at 2.2 MW

Physics Operator Comments

Dec 14 2003 10:44:51:020PM Robert Granetz Engineering setup for Tuesday, 16 Dec 2003

MP 355 ICRF post-boron conditioning
MP 377 Energy confinement in double-null (standby)

Session leader: S. Wukitch (MP 355), E. Marmar (MP 377)
Physics operator: R. Granetz

ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00.
Bake at 60 C overnight as well.

*********
* NOTE: * Run begins at 08:00 and ends at 15:00, due to the PSFC holiday party.
********* ----- -----

Power systems the same as on 1031204037 (fiducial discharge, 1.0 MA, 5.4 T,
lower single null).

A-coils should be hooked up as on 1031204037 (+Dtop -Dbot -Jtop +Jbot), and
the power supply should be enabled.

Gas setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid enabled (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill C-side with 30 psi D2 Hybrid enabled (PG3)

Enable the following gate valves, assuming no vacuum problems:
ECE, VUV, DNB

-------------------------------------------------------------------------------
RF Setup: All 4 transmitters in Run On by 07:00 (note earlier time)

-------------------------------------------------------------------------------
Run Plan:

Boronization recovery: using the 1 MA fiducial shot (1031204037), get all
the transmitters/antennas going again at full power.

If that goes as fast as last time, then we will change to double null
plasmas and take up where we left off on MP 377.

Dec 16 2003 07:52:02:510AM Robert Granetz Boronization was done last evening.
ECDC in helium was done overnight, but no 60 C bake.

Hybrid coldstart done by the engineering group; no errors found

Loaded PCS segment 1 from 1031212024 (most recent shot).
Loaded PCS segment 2 from 1031204037 (1 MA, 5.4 T fiducial).

Dec 16 2003 08:14:57:860AM Robert Granetz The start of the run will be delayed while the RF tries to get some vacuum
conditioning done. This will be followed by some ECDC in D2.

Dec 16 2003 10:08:19:307AM 1031216001 Robert Granetz Shot 01 -- Plasma. Good shot. 1.0 MA fiducial. Bruce just informed me that
the gate valve should have been set to remained closed on the
fiducial, which was news to me. Prf=2+ MW (D and E). One H-mode.
Startup just barely made it.

Next shot: reduce pre-fill by 1 ms. Set main gate valve to remain
closed for 8 minutes after the shot (at Bruce's request).

Dec 16 2003 10:10:41:913AM 1031216002 Robert Granetz Shot 02 -- Plasma. Another good shot. D and E are good; still no J-port
power. Longer H-mode. 120 kJ with 2.3 MW of RF. Zeff=1.5.
Very low carbon light during startup.

Next shot: repeat, no PCS changes

Dec 16 2003 10:15:04:660AM 1031216003 Robert Granetz Shot 03 -- Dud. No EF3. Problem with EF3 breaker.

Next shot: repeat, no PCS changes

Dec 16 2003 10:43:31:033AM 1031216004 Robert Granetz Shot 04 -- Plasma. Good shot. All three antenna systems are working, but the
data acquisition for J-port is not working, so we don't know how
much power it's radiating. It's presumably comparable to D and E,
which would make Prf about 4.5 MW. Two H-modes, with Wth=160 kJ.

Next shot: repeat, with slight tweak on Br_0

Dec 16 2003 11:01:37:090AM 1031216005 Robert Granetz Shot 05 -- Plasma. Good shot. All antennas and transmitters are working.
Prf=4.5 MW. Long EDA H-mode.

Next shot: no PCS changes. RF will change from a stepped waveform
to a simple flat waveform at 4.5 MW

Dec 16 2003 11:20:25:367AM 1031216006 Robert Granetz Shot 06 -- Plasma. Good shot. Prf=4.5 MW, but with lots of faulting on J3 and
J4.

Next shot: repeat, no PCS changes

Dec 16 2003 11:34:29:943AM 1031216007 Robert Granetz Shot 07 -- Plasma. Good shot. Prf=4.6 MW, with some faulting on D. Success
declared on the boronization recovery (MP 355).

Next shot: load a recent double null shot (1031211016), except
keep segment 1 from the present shot, and begin MP 377.

NOTE: the active segment is #4 !!

Dec 16 2003 11:49:33:143AM 1031216008 Robert Granetz Shot 08 -- Plasma. Good shot. Nearly double null, but actually more upper
single null. Disrupted halfway down the rampdown. Prf=4.6 MW,
with lots of faulting. RF pulse goes from t=0.6 to 1.0 s. H-mode.
Wth=170 kJ. Lots of large m=1/n=1 at the H-L backtransition.

Next shot: tweak the SSEP gain to remove the rampdown disruption.
RF programming is also being changed.

Dec 16 2003 11:57:34:260AM 1031216009 Robert Granetz Shot 09 -- Plasma. Good shot. Ramped all the way down. Prf=4.5 MW until
t=1.0 s (with no faults), and then started ramping up to 6 MW, but
with lots of faulting on J3 and J4.

Next shot: no PCS change, but delay the RF pulse by 100 ms at the
request of John Rice.

Dec 16 2003 12:11:43:027PM 1031216010 Robert Granetz Shot 10 -- Plasma. Good shot. RF looked the same, except for the 100 ms
shift.

Next shot: no PCS changes, but lower the J-port RF power by 50%.

Dec 16 2003 12:33:55:500PM 1031216011 Robert Granetz Shot 11 -- Plasma. Good shot. Prf=3.3 MW flat, then ramping up to 6 MW with
only one fault. SSEP=+2 mm, kappa=1.73, delta_L=0.45, delta_U=0.65,
inner gap=2.0 cm, outer gap=1.1-1.4 cm. nl_04 (target)=0.9e20 m-2,
Ip=1.04 MA, Btor=5.4 T. Wth peaks at 190 kJ at peak RF power.

Next shot: repeat, no changes

Dec 16 2003 12:54:57:443PM 1031216012 Robert Granetz Shot 12 -- Plasma. Good shot. There was a big chunk taken out of the plasma
current between t=0.1-0.2 s. Wth=200 kJ. Peak Rdd>1.0e14 s-1.

Next shot: no PCS changes; keep RF on for another 100 ms

Dec 16 2003 12:54:26:240PM 1031216013 Robert Granetz Shot 13 -- Fizzle.

Next shot: reduce pre-fill gas puff by 1 ms

Dec 16 2003 01:10:54:630PM 1031216014 Robert Granetz Shot 14 -- Plasma. Good shot. The RF pulse is lasting longer than the
current flattop.

Next shot: increase flattop to t=1.5 s (from 1.3 s).

Dec 16 2003 01:20:39:180PM 1031216015 Robert Granetz Shot 15 -- Plasma. Good shot. Current flattop now goes to t=1.5 s. The Btor
flattop still needs to be extended, however. J-port trips out
at t=1.35 s.

Next shot: raise Ip to 1.25 MA and nl_04 to 1.0e20 m-2. Also extend
Btor flattop to t=1.5 s.

Dec 16 2003 01:38:55:707PM 1031216016 Robert Granetz Shot 16 -- Plasma. Good shot. Ip=1.23 MA. Flattop goes to t=1.5 s. RF
doesn't like the higher density. nl_04=1.04e20 m-2. Much of the
engineering data did not come through, so no EFITs.

Next shot: increase nl_04 to 1.2e20 m-2

Dec 16 2003 01:48:15:070PM 1031216017 Robert Granetz Shot 17 -- Plasma. Good shot. nl_04(target)=1.2e20 m-2. Ip=1.22 MA.

Next shot: reduce SSEP by 2 mm. Also reduce argon puff by 2 ms (at
John Rice's request!!)

Dec 16 2003 02:05:05:410PM 1031216018 Robert Granetz Shot 18 -- Fizzle.

Next shot: reduce Br_0 by 0.5 mT. Also reduced argon puff by
another 10 ms (to 30 ms) at Earl's request.

Dec 16 2003 02:28:16:540PM 1031216019 Robert Granetz Shot 19 -- Plasma. Good shot. TF crowbarred. This equilibrium was much more
"double-null"-like than previous shots today. Wth reaches 170 kJ.

Next shot: increase nl_04 to 1.4e20 m-2 and return SSEP to its
value before shot 19.

Dec 16 2003 02:48:19:483PM 1031216019 Robert Granetz The next shot will be delayed while a fuse is changed.

Dec 16 2003 02:57:58:007PM 1031216020 Robert Granetz Shot 20 -- Plasma. Good shot. Back to the slightly (magnetically) unbalanced
double null. nl_04(target)=1.4e20 m-2. J-port didn't go (because
of the higher density). Wth=130-140 kJ with Prf=2-3 MW.

Next shot: no changes

Dec 16 2003 03:06:27:137PM 1031216021 Robert Granetz Shot 21 -- Plasma. Good shot. Pretty much a repeat of the previous shot.
J-port still didn't go. Wth=155 kJ, Prf=3 MW.

End of run

Engineering Operator Comments

Shot Time Type Status Comment

1 09:23:49:970AM Plasma Ok

2 09:55:39:040AM Plasma Ok

3 10:11:05:290AM Plasma Ok

4 10:27:07:443AM Plasma Ok

5 10:53:56:193AM Plasma Ok

6 11:12:08:390AM Plasma Ok

7 11:24:50:093AM Plasma Ok

8 11:38:02:017AM Plasma Ok

9 11:51:31:643AM Plasma Ok

10 12:04:13:660PM Plasma Ok

11 12:16:40:223PM Plasma Ok

12 12:33:54:500PM Plasma Ok

13 12:46:40:140PM Plasma Ok

14 12:59:15:317PM Plasma Ok

15 01:11:49:440PM Plasma Ok

16 01:24:16:177PM Plasma Ok

17 01:38:48:173PM Plasma Ok

18 01:51:39:677PM Plasma Ok

19 02:04:36:397PM Plasma Bad TF comm fault at +2.7 seconds

20 02:44:50:427PM Plasma Ok

21 02:58:30:350PM Plasma Ok

Session Leader Comments
Dec 16 2003 11:23:00:270AM	1031216001	Steve Wukitch	001 BT~5.4 T, Ip~ 1 MA, nl04~0.8 - fiducial D: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec E: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec J: 0.5, 1.0, 1.5, 2. MW steps [0.6,1.5]sec result: plasma D: ran E: ran J: did not run - no bira demand
Dec 16 2003 11:22:45:690AM	1031216002	Steve Wukitch	002 BT~5.4T, Ip~1 MA, nl04~0.8 - fiducial D: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec E: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec J: 0.5, 1.0, 1.5, 2. MW steps [0.6,1.5]sec result: plasma D: ran E: ran 1 fault J: ran no J3
Dec 16 2003 11:22:33:097AM	1031216003	Steve Wukitch	003 NTP
Dec 16 2003 11:20:43:943AM	1031216004	Steve Wukitch	004 BT~5.4T, Ip~1 MA, nl04~0.8 - fiducial D: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec E: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec J: 0.5, 1.0, 1.5, 2. MW steps [0.6,1.5]sec result: plasma D: ran E: ran J: ran 9 faults
Dec 16 2003 11:00:45:513AM	1031216005	Steve Wukitch	005 BT~5.4T, Ip~1 MA, nl04~0.8 - fiducial D: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec E: 0.25, 0.5, .75, 1. MW steps [0.6,1.5]sec J: 0.5, 1.0, 1.5, 2. MW steps [0.6,1.5]sec result: plasma D: ran 2 faults E: ran J: ran 2 faults
Dec 16 2003 11:18:10:213AM	1031216006	Steve Wukitch	006 BT~5.4T, Ip~1 MA, nl04~0.8 - fiducial plasma with constant RF power D: 1.0 MW [0.6,1.5]sec E: 1.0 MW [0.6,1.5]sec J: 2.0 MW [0.6,1.5]sec result: plasma D: ran 7 faults E: ran J: ran 6 faults next shot: repeat
Dec 16 2003 11:31:55:977AM	1031216007	Steve Wukitch	007 BT~5.4T, Ip~1 MA, nl04~0.8 - fiducial plasma with constant RF power D: 1.0 MW [0.6,1.5]sec E: 1.0 MW [0.6,1.5]sec J: 2.0 MW [0.6,1.5]sec result: plasma D: ran 7 faults E: ran J: ran next shot: move to MP 377 1031211016
Dec 16 2003 11:52:33:750AM	1031216008	Dale Meade	Meade just arrived. Shot 1031216008 was to be a repeat of 1031211016.
Dec 16 2003 11:53:30:703AM	1031216008	Earl Marmar	switching to mp377 after boron recovery start with reload of 1031211016, DN (SSEP ~ +0.2 cm) plasma, some rf trips Wmax = 177 kJ, H89 ~ 1.5 (but trips complicate interpreptation)
Dec 16 2003 12:03:44:470PM	1031216009	Dale Meade	H89 = 1.64 at first h-mode
Dec 16 2003 12:05:36:377PM	1031216009	Earl Marmar	repeat plasma; steady RF 3 H-modes; looking ELM-free 3'rd H-Mode coming almost to a steady-state, H89 ~ 1.4 Wmax = 179 kJ
Dec 16 2003 12:35:00:483PM	1031216011	Dale Meade	H89 = 1.56 for the first h-mode , the second H-mode is staedy at ~ 1.5
Dec 16 2003 12:56:07:303PM	1031216011	Earl Marmar	lower RF power early (3 MW) then ramp up to 6 MW first H-mode: Wmax = 164 kJ (3 MW), H89 ~ 1.6 (when dW/dt = 0)
Dec 16 2003 12:46:21:797PM	1031216012	Dale Meade	The third H-mode was best H89 = 1.56 @ PRF = 6.14 MW
Dec 16 2003 12:53:19:947PM	1031216012	Earl Marmar	repeat plasma 3'rd H-mode with RF ramp to 6 MW gives H89 ~ 1.55, Wmax = 200 kJ
Dec 16 2003 01:51:45:893PM	1031216017	Earl Marmar	1.2 MA Plasma Wmax = 178 kJ, Prf = 3.4 MW H89 ~ 1.34 (at dW/dt = 0)
Dec 16 2003 03:02:16:080PM	1031216020	Earl Marmar	nl_04 target to 1.4e20 plasma; lower RF power (no J-port) barely into H-mode at 2.2 MW

Physics Operator Comments
Dec 14 2003 10:44:51:020PM		Robert Granetz	Engineering setup for Tuesday, 16 Dec 2003 MP 355 ICRF post-boron conditioning MP 377 Energy confinement in double-null (standby) Session leader: S. Wukitch (MP 355), E. Marmar (MP 377) Physics operator: R. Granetz ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Bake at 60 C overnight as well. ********* * NOTE: * Run begins at 08:00 and ends at 15:00, due to the PSFC holiday party. ********* ----- ----- Power systems the same as on 1031204037 (fiducial discharge, 1.0 MA, 5.4 T, lower single null). A-coils should be hooked up as on 1031204037 (+Dtop -Dbot -Jtop +Jbot), and the power supply should be enabled. Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB ------------------------------------------------------------------------------- RF Setup: All 4 transmitters in Run On by 07:00 (note earlier time) ------------------------------------------------------------------------------- Run Plan: Boronization recovery: using the 1 MA fiducial shot (1031204037), get all the transmitters/antennas going again at full power. If that goes as fast as last time, then we will change to double null plasmas and take up where we left off on MP 377.
Dec 16 2003 07:52:02:510AM		Robert Granetz	Boronization was done last evening. ECDC in helium was done overnight, but no 60 C bake. Hybrid coldstart done by the engineering group; no errors found Loaded PCS segment 1 from 1031212024 (most recent shot). Loaded PCS segment 2 from 1031204037 (1 MA, 5.4 T fiducial).
Dec 16 2003 08:14:57:860AM		Robert Granetz	The start of the run will be delayed while the RF tries to get some vacuum conditioning done. This will be followed by some ECDC in D2.
Dec 16 2003 10:08:19:307AM	1031216001	Robert Granetz	Shot 01 -- Plasma. Good shot. 1.0 MA fiducial. Bruce just informed me that the gate valve should have been set to remained closed on the fiducial, which was news to me. Prf=2+ MW (D and E). One H-mode. Startup just barely made it. Next shot: reduce pre-fill by 1 ms. Set main gate valve to remain closed for 8 minutes after the shot (at Bruce's request).
Dec 16 2003 10:10:41:913AM	1031216002	Robert Granetz	Shot 02 -- Plasma. Another good shot. D and E are good; still no J-port power. Longer H-mode. 120 kJ with 2.3 MW of RF. Zeff=1.5. Very low carbon light during startup. Next shot: repeat, no PCS changes
Dec 16 2003 10:15:04:660AM	1031216003	Robert Granetz	Shot 03 -- Dud. No EF3. Problem with EF3 breaker. Next shot: repeat, no PCS changes
Dec 16 2003 10:43:31:033AM	1031216004	Robert Granetz	Shot 04 -- Plasma. Good shot. All three antenna systems are working, but the data acquisition for J-port is not working, so we don't know how much power it's radiating. It's presumably comparable to D and E, which would make Prf about 4.5 MW. Two H-modes, with Wth=160 kJ. Next shot: repeat, with slight tweak on Br_0
Dec 16 2003 11:01:37:090AM	1031216005	Robert Granetz	Shot 05 -- Plasma. Good shot. All antennas and transmitters are working. Prf=4.5 MW. Long EDA H-mode. Next shot: no PCS changes. RF will change from a stepped waveform to a simple flat waveform at 4.5 MW
Dec 16 2003 11:20:25:367AM	1031216006	Robert Granetz	Shot 06 -- Plasma. Good shot. Prf=4.5 MW, but with lots of faulting on J3 and J4. Next shot: repeat, no PCS changes
Dec 16 2003 11:34:29:943AM	1031216007	Robert Granetz	Shot 07 -- Plasma. Good shot. Prf=4.6 MW, with some faulting on D. Success declared on the boronization recovery (MP 355). Next shot: load a recent double null shot (1031211016), except keep segment 1 from the present shot, and begin MP 377. NOTE: the active segment is #4 !!
Dec 16 2003 11:49:33:143AM	1031216008	Robert Granetz	Shot 08 -- Plasma. Good shot. Nearly double null, but actually more upper single null. Disrupted halfway down the rampdown. Prf=4.6 MW, with lots of faulting. RF pulse goes from t=0.6 to 1.0 s. H-mode. Wth=170 kJ. Lots of large m=1/n=1 at the H-L backtransition. Next shot: tweak the SSEP gain to remove the rampdown disruption. RF programming is also being changed.
Dec 16 2003 11:57:34:260AM	1031216009	Robert Granetz	Shot 09 -- Plasma. Good shot. Ramped all the way down. Prf=4.5 MW until t=1.0 s (with no faults), and then started ramping up to 6 MW, but with lots of faulting on J3 and J4. Next shot: no PCS change, but delay the RF pulse by 100 ms at the request of John Rice.
Dec 16 2003 12:11:43:027PM	1031216010	Robert Granetz	Shot 10 -- Plasma. Good shot. RF looked the same, except for the 100 ms shift. Next shot: no PCS changes, but lower the J-port RF power by 50%.
Dec 16 2003 12:33:55:500PM	1031216011	Robert Granetz	Shot 11 -- Plasma. Good shot. Prf=3.3 MW flat, then ramping up to 6 MW with only one fault. SSEP=+2 mm, kappa=1.73, delta_L=0.45, delta_U=0.65, inner gap=2.0 cm, outer gap=1.1-1.4 cm. nl_04 (target)=0.9e20 m-2, Ip=1.04 MA, Btor=5.4 T. Wth peaks at 190 kJ at peak RF power. Next shot: repeat, no changes
Dec 16 2003 12:54:57:443PM	1031216012	Robert Granetz	Shot 12 -- Plasma. Good shot. There was a big chunk taken out of the plasma current between t=0.1-0.2 s. Wth=200 kJ. Peak Rdd>1.0e14 s-1. Next shot: no PCS changes; keep RF on for another 100 ms
Dec 16 2003 12:54:26:240PM	1031216013	Robert Granetz	Shot 13 -- Fizzle. Next shot: reduce pre-fill gas puff by 1 ms
Dec 16 2003 01:10:54:630PM	1031216014	Robert Granetz	Shot 14 -- Plasma. Good shot. The RF pulse is lasting longer than the current flattop. Next shot: increase flattop to t=1.5 s (from 1.3 s).
Dec 16 2003 01:20:39:180PM	1031216015	Robert Granetz	Shot 15 -- Plasma. Good shot. Current flattop now goes to t=1.5 s. The Btor flattop still needs to be extended, however. J-port trips out at t=1.35 s. Next shot: raise Ip to 1.25 MA and nl_04 to 1.0e20 m-2. Also extend Btor flattop to t=1.5 s.
Dec 16 2003 01:38:55:707PM	1031216016	Robert Granetz	Shot 16 -- Plasma. Good shot. Ip=1.23 MA. Flattop goes to t=1.5 s. RF doesn't like the higher density. nl_04=1.04e20 m-2. Much of the engineering data did not come through, so no EFITs. Next shot: increase nl_04 to 1.2e20 m-2
Dec 16 2003 01:48:15:070PM	1031216017	Robert Granetz	Shot 17 -- Plasma. Good shot. nl_04(target)=1.2e20 m-2. Ip=1.22 MA. Next shot: reduce SSEP by 2 mm. Also reduce argon puff by 2 ms (at John Rice's request!!)
Dec 16 2003 02:05:05:410PM	1031216018	Robert Granetz	Shot 18 -- Fizzle. Next shot: reduce Br_0 by 0.5 mT. Also reduced argon puff by another 10 ms (to 30 ms) at Earl's request.
Dec 16 2003 02:28:16:540PM	1031216019	Robert Granetz	Shot 19 -- Plasma. Good shot. TF crowbarred. This equilibrium was much more "double-null"-like than previous shots today. Wth reaches 170 kJ. Next shot: increase nl_04 to 1.4e20 m-2 and return SSEP to its value before shot 19.
Dec 16 2003 02:48:19:483PM	1031216019	Robert Granetz	The next shot will be delayed while a fuse is changed.
Dec 16 2003 02:57:58:007PM	1031216020	Robert Granetz	Shot 20 -- Plasma. Good shot. Back to the slightly (magnetically) unbalanced double null. nl_04(target)=1.4e20 m-2. J-port didn't go (because of the higher density). Wth=130-140 kJ with Prf=2-3 MW. Next shot: no changes
Dec 16 2003 03:06:27:137PM	1031216021	Robert Granetz	Shot 21 -- Plasma. Good shot. Pretty much a repeat of the previous shot. J-port still didn't go. Wth=155 kJ, Prf=3 MW. End of run

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:23:49:970AM	Plasma	Ok
2	09:55:39:040AM	Plasma	Ok
3	10:11:05:290AM	Plasma	Ok
4	10:27:07:443AM	Plasma	Ok
5	10:53:56:193AM	Plasma	Ok
6	11:12:08:390AM	Plasma	Ok
7	11:24:50:093AM	Plasma	Ok
8	11:38:02:017AM	Plasma	Ok
9	11:51:31:643AM	Plasma	Ok
10	12:04:13:660PM	Plasma	Ok
11	12:16:40:223PM	Plasma	Ok
12	12:33:54:500PM	Plasma	Ok
13	12:46:40:140PM	Plasma	Ok
14	12:59:15:317PM	Plasma	Ok
15	01:11:49:440PM	Plasma	Ok
16	01:24:16:177PM	Plasma	Ok
17	01:38:48:173PM	Plasma	Ok
18	01:51:39:677PM	Plasma	Ok
19	02:04:36:397PM	Plasma	Bad	TF comm fault at +2.7 seconds
20	02:44:50:427PM	Plasma	Ok
21	02:58:30:350PM	Plasma	Ok