Alcator C-Mod Run 1110121 Information

Miniproposals

Miniproposal: 602

Date Filed: 2/26/2010

Title: Core Fluctuations and Transport in Two -Frequency ICRF Heated ITB Plasmas with Jogs and Modulated IC

First Author: Darin Ernst

Session Leader: Darin Ernst (shots 1-31)

Operators
Session leader(s):	Darin Ernst
Physics operator(s):	Yijun Lin
Engineering operator(s):	Roza Tesfaye,Bill Byford,Ed Fitzgerald

Engineering Operator Run Comment
PO: Y. Lin, SL: D. Ernst; MP 602: Fluctuations and Transport in Two -Fre

Session Leader Plans

Physics Operators Plans

Entered: Jan 20 2011 02:07:59:700PM

Author: Yijun Lin

PO: Y. Lin, SL: D. Ernst

MP 602: Fluctuations and Transport in Two -Frequency ICRF Heated ITB Plasmas
with Jogs and Modulated ICRH

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

Run begins at 09:00 and ends at 17:00
(possibly a short break at 1:30 pm for IAP tour)

Power systems as on: 1110120001 (5.4 T, 0.8 MA)
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 ENABLED (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3)
leave NINJA as DISABLED

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

Torvac gatevalve toggle (yes/no): no

Boronization: no
Overnight ECDC: yes
ICRF: YES (all transmitters)
LH: no
Cryopump: yes
DNB: yes

overnight ECDC
Gas Setup
Gas: D2, 2.0e-4 Torr
sweep: 44/45/103 cm
scan: 20/120 s

Experimental plan:

Continuation of the run on 1110120. See SL plan.

Later in the run, Zcur jog may be added. Use segment 2 from shot 1100324024 (the shot was a 5 o'clock fizzle, but it was expected to work according Wolfe's PO-summary).

Session Leader Summaries

Entered: Jan 21 2011 05:40:35:810PM

Author: Darin Ernst

Preliminary summary:

Very hard to stay in H-mode as we lost the boronization. Got a couple of
great shots by changing the heating scheme. A few shots into the day, the
impurity accumulation and associated radiation caused back transitions in
the range 0.9 to 1.2 seconds. We spent most of the day optimizing the on-axis
heating to control the impurity accumulation, in efforts to extend the ITB
duration. Catherine's preheat scheme with reduced J power worked well for one
shot. Steve Wukitch's neon puffing scheme, with high D&E preheat and J port
powers was very successful at the end of the run (29-31), and led to our
highest central densities. However, we needed more development to get the
on-axis heating strong enough to raise Te0 significantly. The best shots
were 2, 8, 9, 15, 16, 17, 24, 30, 31. Also 1110120030 from yesterday.

We saw some changes on PCI for some of the shots during on-axis heating, but
not as large as on 1100324019. We had the PCI mask at a horizontal orientation
for most of the run until we rotated it 6 degrees for 29-31.

We were careful to time the on-axis D&E port pulses to synch with the DNB
for CXRS. We also puffed NINJA D2 gas and ran GPI, CXRS, thermocouples, etc.
Reflectometry was also collecting data.

Physics Operator Summaries

Entered: Jan 21 2011 05:03:05:130PM

Author: Yijun Lin

PO_summary: 1110121

good run.

Total 31 plasma attempts
Fizzle: 1
disruption: 3 (one early disruption, 2 during rampdown)

Breakdown was late for some shots, but it was corrected by lowering IC_EF4U.
Shortening prefill caused two bouncers, but corrected by restoring the prefill.

Tried Ne puff from H-bottom (2 psi) in shot 29, 30 and 31. This puff helped to maintain long EDA H-mode and got the best ITB shots.

Session Leader Comments

Jan 21 2011 09:00:46:533AM 1110121001 Darin Ernst Repeat shot 11101200030

Jan 21 2011 09:12:15:080AM 1110121001 Darin Ernst Repeat shot 11101200030

RESULT: Late H-Mode near 0.94s, ITB ne0max ~ 4.5. Sawteeth remained.
Very similar J-port fault on third pulse as in 11101200030, but not
exactly same. DNB current sags during H-mode (not typical).
Zeff was much lower this shot (about 1.5 from Zave), compared
to 2.8 in 0030.

NEXT: repeat

Jan 21 2011 09:31:07:083AM 1110121002 Darin Ernst Nice ITB, lost sawteeth around 1.0 sec, ne0 goes from 4.0 to 5.2.
Prad keeps ramping throughout. Zeff jumps from 1.7 to 2.7 when
sawteeth disappear. This shot was nearly identical to shot 30 (last
shot yesterday), except that ne0 and Te0, Ti0 sag a little more after 1.3 sec.
RF looks perfect.

NEXT: keep same setup, but add in a 1 MW on-axis pulse at 1.2 sec, to blast
Te0 up when the density is most peaked. Keep the same 0.6 MW pulse train after
this.

Jan 21 2011 10:02:43:627AM 1110121003 Darin Ernst Two H-modes, back transition & J-port fault at top of J-port ramp.
Looks like an injection near 0.785 sec terminated H-Mode and faulted J.
Actually a nice ITB, as pointed out by Steve Wolfe. ne0 peaks 1.4 sec
near 5.2. The on-axis pulse at 1.4 caused ne0 to drop back to 4,
but it did level off Prad. The first large on-axis pulse didn't hinder
the ITB ne0 rampup much. Lost sawteeth at 1.16, just before first on-axis
pulse. Te0 goes downhill starting 1.237 s, but Te(r) doesn't hollow.

GPI was disabled up through this shot...M. Churchill turning it on...

NEXT: repeat, this time turning off the injection...

Jan 21 2011 09:54:05:370AM 1110121004 Darin Ernst Late H-mode at 0.86 sec. Got medium ITB with ne0 ~ 4, peaking ag 1.2 sec.
Sawteeth remained. First on-axis pulse dropped ne0 to ~3. Prad leveled
starting 1.26 sec.

NEXT: Move E preheat and J-port ramp earlier by 100ms to start at 0.5 sec,
leave on-axis pulses same.

Jan 21 2011 10:10:59:013AM 1110121005 Darin Ernst Moving heating earlier by 100ms did move H-Mode earlier.
Nice ITB with ne0 ~ 4.7, but break in slope in prad_bolo around 1.0 sec.
Te0 drops sharply starting 1.0 sec. This is where we lost sawteeth.
Classic impurity accumulation: Zeff increases from 2 to 3 starting 1.0 sec.

NEXT: Move on-axis pulses 100 ms earlier.

Jan 21 2011 10:35:36:667AM 1110121006 Darin Ernst Good ITB with ne0_max ~ 4.4 near 1.12 sec. On-axis timing good.
Hindered by J-port fault just before first on-axis pulse.

Move J-port fault to end of discharge.

NEXT: repeat

Jan 21 2011 10:46:05:387AM 1110121007 Darin Ernst Good ITB with ne0_max taking off when sawteeth disapear around 1.0.
ne0 ~ 5.2 at 1.07 s. Nothing obvious on PCI. There was a J port
fault at the tail end of the first E port pulse. This shot very similar
to 2, better than 5, but drooped more than 2 b/c of the RF fault.
Best shot so far is 2, which was not quite as good as 30.

NEXT: repeat with 1.2 MW first E port pulse at 1.1 sec.

Jan 21 2011 11:01:01:060AM 1110121008 Darin Ernst Very similar to 2,5,7 up through end of 1st on-axis pulse. But saw a
much larger impurity pileup after sawteeth disappeared at 1.0 s.
J faulted after 2nd on-axis pulse. PCI does show some interesting
changes during the first on-axis pulse on this shot, from 1.1 - 1.25 sec.
QC freq. appears to move from 70 kHz to 125, then falls to 110 kHz.
Response trails Te0.

NEXT: try a small on-axis pulse at 1.0 sec, to try to reduce impurity
pileup, without compromising ne0 too much.

Jan 21 2011 11:30:53:670AM 1110121009 Darin Ernst Not that great. ne0 reached 4.0, then seemed to have partial back-transition
at 1.15 s. PCI shows QC freq. increasing sharply during first on-axis heating
pulse, trailing Te0. Prad has been increasing with shot number -- are we
burning through the boronization? PCI sees some increase in broadband during
the first on-axis pulse, in phase with Te0.

Repeat.

Jan 21 2011 11:32:06:610AM 1110121010 Darin Ernst bonked early.

NEXT: Draw out first 400kW on-axis 50ms earlier in effort to control
impurity accum, and blast it with 1.8 MW on the first on-axis pulse at
1.1 s.

Jan 21 2011 11:39:22:430AM 1110121011 Darin Ernst ITB forming, not hindered much by early on-axis warming. ne0 ~4 a little
after back-transition, which appears to be caused by first J-port fault.

NEXT: repeat

Jan 21 2011 11:56:32:677AM 1110121012 Darin Ernst Lost H-Mode ~1.02 sec due to impurity accumulation starting 0.96 sec.
Looks like boronization not lasting.

Back to the game of trying to stay in H-mode after the ITB begins
to radiate.

Raise target density to 1.1. Raise on-axis early ITB heating to
400 kW from 200 kW, starting 0.95 sec.

Jan 21 2011 12:14:18:377PM 1110121013 Darin Ernst Lost H-Mode ~1.13 sec. Looks like an injection.
The 400 kW on-axis warming starting 0.95 sec was too strong,
and halted the density rise. It did not seem to help lower Prad.
So get rid of the warming -- the extra heat may be increasing
the impurity source. Lower E-port power to 1.5 MW in case got
injection from E. ne_tgt=1.1.

Jan 21 2011 12:29:05:017PM 1110121014 Darin Ernst Lost H-mode 2x, but 2nd H-mode shows
ne0 ~ 4.4 at 1.1 s, with on-axis control (too strong, though).

NEXT: Increase J-port power by 400 kW.

Jan 21 2011 12:46:24:793PM 1110121015 Darin Ernst Good shot.

Increased J-port power to about 2.7 MW. This helped stay in H-mode.
Had partial back transition and J fault 1.16sec, as Prad spiked up
during the first on-axis pulse. Comes from edge and drops Te8
sharply, as in previous shots.

NEXT: Move first on-axis pulse to 1.0 sec.

Jan 21 2011 01:09:42:463PM 1110121016 Darin Ernst Good shot. Stayed in H-Mode. ne0 ~ 4.7 at 1.01 s during first on-axis
pulse, which dropped ne0 to 3.2. Central density then recovered
to ne0 ~ 5 at 1.58 s. ne0 was around 4 during each on-axis pulse.
Want larger swings in Te0 at higher ne0.

First pulse successfully prevented spike in Prad and associated
back-transition.

NEXT: Turn 1st pulse down to 600 kW and ramp successive pulses up
in 200 kW increments.

Jan 21 2011 01:22:52:043PM 1110121017 Darin Ernst Good shot. Stayed in H-Mode. Nice RF, only one fault near end.
Held ne0 ~ 5 from 1.1 - 1.2 s. Check PCI arond 1.14 sec: nothing
obvious.

NEXT: on axis powers 0.6, 1.5, 0.2, 0.2, 0.2, 1.6

Jan 21 2011 01:39:04:393PM 1110121018 Darin Ernst ne0 ~ 4 at 1.03 s, 2nd on-axis pulse too strong. Then back-transition, and
very low sustained Te0. Recovers by last RF pulse. Got large
swing in Te0 on last pulse, but not with very high ne0.

NEXT: Switch from E to D port to check if Prad rise is coming from E.
On axis powers: 0.8 MW all pulses

Jan 21 2011 02:02:25:160PM 1110121019 Darin Ernst With D-port, Prad signature is similar. Probably not coming from E.
Looks like impurity accum. does not lower Te0 until starting 1.05 s.
So delay on-axis pulses to 1.06, keep 800 kW.

NEXT: delay on-axis pulses to 1.06 s.

Jan 21 2011 02:11:10:550PM 1110121020 Darin Ernst Good until back-transition. Prad cooling began at 0.92 sec. ne0 ~ 5 max
@ 1.054 s. First on-axis pulse drops ne0 from 5 to 4. Check PCI around 1.06 s.
Problem is that Te0 cooled drastically before 1st on-axis pulse.

NEXT: move on-axis pulses to 1.0 s, 40ms on, 60 ms off.

Jan 21 2011 02:29:01:963PM 1110121021 Darin Ernst
NEXT: no Ar puff. Start on-axis pulsetrain at 1.2 sec.

Jan 21 2011 02:36:33:143PM 1110121021 Darin Ernst Lost H-mode 1.09 s. ne0 ~ 5, got a nice swing in Te0,
peaking near 1.03 s, reaching 2 keV. Good candidate for
PCI fluctuations. Radiatoin cools core immediately
after 1st on-axis pulse. One of the better shots.

NEXT: no Ar puff. Start on-axis pulsetrain at 1.2 sec.

Jan 21 2011 02:52:55:553PM 1110121022 Darin Ernst This case w/o Ar looks similar to the other cases. So the rapid
impurity buildup is probably not Ar.

NEXT: Try lowering the J-port power as suggested by Steve Wolfe, using
1060726022 as a basis as suggested by Catherine Fiore. This has a
2MW preheat, which was D,E, followed by 1 MW J-port. This may help
reduce the impurity influx. Our Zeff and target densities are nearly
the same as in the 2006 case. We will bring J down to 1.5 MW from
a peak of 2 MW preheat (we will use J for the preheat instead of D,E,
since we have more power available in J now than in 2006).

We will keep the D-port pluses starting 1.2 sec.

Jan 21 2011 03:08:20:053PM 1110121023 Darin Ernst Got impurity buildup rapidly in the first two H-Modes. First H-mode did
have an ITB with ne0 following the previous shots closely. nel also
followed prevvious shots closely.

NEXT: Try D,E preheat instead of J.

Jan 21 2011 04:31:53:593PM 1110121024 Darin Ernst ** Great shot. Nice strong ITB. ne0~5.5. Great swings on Te0 with
large sawteeth during on-axis pulses. Stays in steady state from 1.25 s onward.
PCI sees bursts during on-axis heating.

NEXT: on-axis pulses: Delay to 1.3 sec, 60ms on, 40ms off. Increase to 1MW.
Want to synch with DNB (every 100ms) and CXRS (every 20ms).

Jan 21 2011 03:39:09:400PM 1110121025 Darin Ernst Lost H-Mode 1.0 sec. No real ITBs. Looks identical to 24 in early phase.
Prad slightly lower than 24.

NEXT: Try turning J-power up from 1.5 MW to 1.7 MW.

Jan 21 2011 03:57:03:513PM 1110121026 Darin Ernst Lost H-Mode 1.0 sec. No real ITBs. Similar. Spike in Prad at 0.925 s.
SXR takes off -- heavy metal (S. Wukitch).

NEXT: Start E-port preheat rampdown at 0.7 instead of 0.8, ending at 0.8 sec.
Cut J back to 1.5 MW.

Jan 21 2011 04:26:24:870PM 1110121028 Darin Ernst Lost H-Mode 0.8 sec. Prad evolution looks same as previous shots starting at 24.

NEXT: Try Steve Wukitch's neon trick. Go back to heavy preheat with E-port,
crank up J-port again to 2.5 MW.

Jan 21 2011 04:41:54:817PM 1110121029 Darin Ernst Lost H-Mode 1.0 sec. Prad evolution similar but 2x larger.

Central density closely follows shot #2, better than more recent shots.

NEXT: Try reducing neon. Rotate PCI mask 6 degrees.

Jan 21 2011 04:59:30:170PM 1110121030 Darin Ernst It worked. Best ne0 of the day, reaching 6. Stays to 1.4 or so before
falling sharply. Te0 had dropped significantly, but in part due to power
rampdown.

NEXT: start on axis pulses at 1.16 s, 1 MW each.

Jan 21 2011 05:20:37:500PM 1110121031 Darin Ernst Another great shot, hitting ne0 ~ 6 at 1.18 sec. On-axis heating timed
nicely, but needed more of it at this density. Didn't lose H-mode until
1.3 sec or so.

PCI might see something. Mask set to 6 degrees. Based on QC mode,
Paul thinks we are looking at the upper half of the cross-section.

-------
THANK YOU TO ALL WHO ADVISED ME ON THIS RUN.

Physics Operator Comments

Jan 21 2011 09:09:23:953AM 1110121001 Yijun Lin Reload shot 1110120030, Ip 0.8 MA. Bt 5.5 T, nl04 1.0e20 m^-2

Load at 21-Jan-2011 08:26:17.00
Open tree /home/ylin/pcs_scratch -1
Open tree done

result: plasma. full length. H-mode.
next: same plasma.
Reduce prepuff by 2 ms.

Jan 21 2011 09:22:20:997AM 1110121002 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL
result: plasma full length. H-mode.
Next: repeat. no dpcs change.

Jan 21 2011 09:38:40:823AM 1110121003 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL
result: plasma full length. H-mode.
Next: repeat.
reduce prefull 2 ms more. to 53 ms.

Jan 21 2011 09:49:05:827AM 1110121004 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL
result: plasma full length. H-mode.
Next: repeat.
reduce prefull 2 ms more to 51 ms

Jan 21 2011 10:07:05:730AM 1110121005 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL
result: plasma full length. H-mode.

bouncer in startup.
It could be too due to too low prefill pressure (I have been lowering the prepuff).

Next: same plasma. lengthen prefill back to 54 ms.

Jan 21 2011 10:26:59:680AM 1110121006 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL
result: plasma full length. H-mode.

bouncer in startup.

Next: increase IC_EF4U from -1293 to -1285 A. lengthen pre-fill to 55 ms.
Same plasma.

Jan 21 2011 10:38:17:743AM 1110121007 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL
result: plasma full length. H-mode.

no more bouncer in startup (changing IC_EF4U helped)
Next: no dpcs change.

Jan 21 2011 11:08:16:377AM 1110121009 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL
result: plasma full length. H-mode.

breakdown is getting later.

Next: shorten prefill by 1 ms.

Jan 21 2011 11:24:34:960AM 1110121010 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL
result: disrupted 0.28 sec (due to injection at 0.25 sec)

Next: no dpcs change.

Jan 21 2011 11:37:13:440AM 1110121011 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL
result: plasma full length.

startup ok.
Next: repeat. no dpcs change.

Jan 21 2011 11:52:29:007AM 1110121012 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL
result: plasma full length.

startup ok.
Next: raise target density to 1.1e20 m^-2. to get more EDAish.

Jan 21 2011 12:23:53:670PM 1110121014 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result: plasma full length.

late breakdown.
Next: repeat. no dpcs change.

Jan 21 2011 12:40:19:547PM 1110121015 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result: plasma full length.

start up ok.
Next: repeat. no dpcs change.

Jan 21 2011 12:59:24:740PM 1110121016 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result: plasma full length.

start up ok. (breakdown a little late, but ok).
Next: repeat. no dpcs change.

Jan 21 2011 01:13:41:470PM 1110121017 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result: plasma full length.

start up ok.
Next: repeat. no dpcs change.

Jan 21 2011 01:48:16:513PM 1110121018 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result: plasma full length.
start up ok.
Next: repeat. no dpcs change.

Jan 21 2011 01:48:22:983PM 1110121019 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result: plasma full length.
start up ok.
Next: repeat. no dpcs change.

Jan 21 2011 02:08:55:687PM 1110121020 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result: plasma full length.

late breakdown.

Free-access for IAP C-Mod tour.

Next: lengthen prefill by 2 ms.

Jan 21 2011 02:37:01:667PM 1110121021 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result: plasma full length.

breakdown is late (t > 10 ms).

Next: turn off argon. Decrease IC_EF4U from -1283 A to -1293 A (undo the change earlier today). Hopeful the breakdown is earlier.

Jan 21 2011 02:53:12:930PM 1110121022 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result:

plasma. disruption at 1.64 sec

breakdown is normal (so IC_RF4U indeed helped).

Next: put argon back.

Jan 21 2011 03:25:27:503PM 1110121024 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result:

plasma. full length. good shot.

breakdown earlier. almost normal.
Next: lower IC_EF4U from -1298A to -1303A.

Jan 21 2011 03:39:09:390PM 1110121025 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result: plasma. full length. good shot.

breakdown at normal time (@5.4 ms)
startup ok.
Next: no dpcs change. repeat.

Jan 21 2011 03:52:26:240PM 1110121026 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result: plasma. full length. good shot.
startup ok.
Next: no dpcs change. repeat.

Jan 21 2011 04:12:16:683PM 1110121027 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result:

fizzle (density did not rise. reason unclear).

Next: no dpcs change. repeat.

Jan 21 2011 04:21:18:480PM 1110121028 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result: plasma full length.

Next: no dpcs change. repeat.

Jan 21 2011 04:29:20:430PM 1110121028 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result: plasma full length.

Next:
Add 2 psi Ne in H-bottom
Program PG5, 0.35 to 0.45 sec at 70 V.
Add dpcs_piezo_chopper outputs "h_bot".

Jan 21 2011 04:34:50:860PM 1110121029 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result: plasma full length.
Got Ne puff.
startup ok.

Next: Lower Ne puff voltage to 50 V.

Jan 21 2011 05:02:17:183PM 1110121031 Yijun Lin programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL
result: plasma full length.
Got Ne puff.
startup ok.

Good ITB shot.

Next: end of run.

Engineering Operator Comments

Shot Time Type Status Comment

1 09:00:21:957AM Plasma Ok

2 09:13:14:113AM Plasma Ok

3 09:28:09:193AM Plasma Ok

4 09:42:33:983AM Plasma Ok

5 09:58:04:230AM Plasma Ok

6 10:14:08:727AM Plasma Ok

7 10:29:58:457AM Plasma Ok

8 10:46:23:490AM Plasma Ok

9 11:01:41:960AM Plasma Ok

10 11:17:17:377AM Plasma Ok

11 11:30:30:273AM Plasma Ok

12 11:45:56:713AM Plasma Ok

13 12:02:17:490PM Plasma Ok

14 12:17:22:860PM Plasma Ok

15 12:34:09:460PM Plasma Ok

16 12:53:21:723PM Plasma Ok

17 01:08:46:780PM Plasma Ok

18 01:25:34:773PM Plasma Ok

19 01:42:10:167PM Plasma Ok

20 01:58:09:520PM Plasma Ok

21 02:25:03:953PM Plasma Ok

22 02:40:38:557PM Plasma Ok

23 02:56:44:737PM Plasma Ok

24 03:13:01:810PM Plasma Ok

25 03:32:01:837PM Plasma Ok

26 03:46:49:090PM Plasma Ok

27 04:02:14:977PM Plasma Ok

28 04:14:38:813PM Plasma Ok

29 04:29:34:100PM Plasma Ok

30 04:44:55:090PM Plasma Ok

31 04:59:46:207PM Plasma Ok

System Availability

Jan 21 2011 09:00:02:350AM

System Available Comment Availability
Changed Owner Description Who Can
Change
Active MHD no secured - tagged out Jun 02 2008 11:03AM (sears) Joe Snipes Active MHD Antenna sears,snipes
BES yes BES system is online Oct 21 2010 11:33AM (bespam) Bill Rowan Beam Emission Spectroscopy bespam,liao,rowan
Bolometers yes 2pi (D+F) working. All midplane and off-midplane diode arrays working except WB1AX. Midplane foils calibrated and PRAD_MAIN is being filled. Divertor/Ledge foils not yet ready. Jul 15 2010 08:27AM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization yes Nov 16 2010 02:36PM (dekow) Jim Irby Boronization dekow,irby
CNPA yes Multiple channel CNPA available Oct 21 2010 07:11PM (parker) Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor no Shut down. Helium dewar removed. LN2 manual valve and solenoid valves are closed and tagged. Apr 06 2010 10:51AM (labombard) Brian LaBombard Upper Divertor Cryopump irby,labombard
CXRS yes Wide-view CXRS system is online Oct 21 2010 11:33AM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,liao,rachmcd,rowan
D Alpha yes \ha2_bright is available; \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 is not available Jul 01 2009 09:45AM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa yes system is aligned; new calibrations (relative brightness and position) not yet implemented Jun 29 2010 10:27AM (marmar) Earl Marmar Visible Bremsstrahlung marmar
Disruption Mitigation yes operational, but turned off Nov 03 2009 04:59PM (granetz) Robert Granetz Gas Jet granetz,whyte
Divertor IR no Mar 06 2007 10:50AM Glen Wurden Divertor IR Digital Video gwurden,terry
Divertor IR Spectroscopy no Mar 06 2007 10:51AM Glen Wurden Divertor IR Spectroscopy gwurden,terry
DNB no in test mode only Nov 03 2009 05:01PM (granetz) Robert Granetz Diagnostic Neutral Beam dterry,granetz,gung
ECDC yes Operational Jun 26 2010 09:28PM (irby) Jim Irby 2.45 GHz, 3 kW, discharge cleaning system dekow,irby,pfeiffer
FRC-ECE yes All channels working and calibrated. Oct 27 2010 03:41PM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips
G-Side Ratiomatic yes Gauges are operational. Jun 28 2010 08:02PM (labombard) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
Glow Discharge no Plugs for Power Supply and Controls have been unplugged and red tagged making system safe for In-Vessel Access. Apr 05 2010 11:18AM (dekow) Jim Irby 1 kV, 5 A, glow discharge system dekow,dterry,irby
GPC yes Operational. Jul 28 2009 04:23PM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPC2 yes Most channels operational. Oct 22 2010 11:46AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPI yes The Xpt-view, the midplane-view cameras are operational. The innerwall GPI (coupled to the fast-diodes) is available. Jul 01 2009 09:45AM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes operating normally Jun 29 2010 10:26AM (marmar) Earl Marmar H/D Ratio marmar
HEAT yes Jun 26 2010 11:19PM (dekow) Gary Dekow - Machine Heaters - burke,dekow
Hirex Jr yes Hirex-Jr has been installed Jun 28 2010 03:36PM (rice) John Rice High Resolution X-Ray ince,rice
Hirex Sr yes System installed and aligned. Inverted Profiles for Ti are available upon request. Vtor profiles still under revision. Dec 17 2010 09:25AM (ypodpaly) John Rice High Resolution X-Ray ince,rice,ypodpaly
HXR yes 32 Channels operational Oct 23 2010 01:41PM (parker) Ron Parker Hard X-Ray Array faust,parker,schmidt
ICRF D-Antenna yes system checked out ok on 11006728. Jun 28 2010 04:57PM (ylin) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna yes system checked out ok on 1100628 Jun 28 2010 04:57PM (ylin) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes system checked out ok. conditioned to vacuum. Jun 28 2010 04:58PM (ylin) Steve Wukitch J-port antenna wukitch,ylin
Laser Blow-Off yes operational and tested Jul 20 2010 04:42PM (g) Martin Greenwald Impurity Injection System g,nthoward
Lower Hybrid yes LH working. New directional couplers installed at input to each klystron. Oct 21 2010 11:42AM (dterry) Ron Parker Lower Hybrid dterry,parker,wallaceg
Lower Hybrid Reflectometer yes 50GHz: up-, 60 GHz up- and down- Oct 21 2010 11:31AM (sgbaek) Arturo Dominguez Lower Hybrid Reflectometer dominguez,marmar,parker,sgbaek
Lower Hybrid SOL reflectometer yes profiles and fluctuations both working. If requested, please request LH launcher to be moved in. Jan 18 2011 03:07PM (cornwall) Cornwall Lau Lower Hybrid SOL reflectometer cornwall,wukitch,ylin
LPI no Beam line removed May 30 2008 02:09PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha no WB4LY and LLY working but not during ICRF. WB1LY not attached due to pickup problems. LYMID attached but have profile problems. Aug 24 2010 09:17AM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke
McPherson yes Spectra being collected and tree filled. Wavelength scan is broken so fixed on the Mo XXXI and XXXII lines. Jul 15 2010 08:28AM (mlreinke) Jim Terry VUV Spectrometer mlreinke,terry
Michelson yes Operational. Oct 22 2010 11:46AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt
MKS yes Gauges are operational Jun 28 2010 08:02PM (labombard) Brian LaBombard Baratron pressure gauges labombard
MLP no System is in edge lab. Version 2 drivers ready to test. Needs a student to help work on it. Jul 14 2009 09:20PM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard
MSE no As of 6/10/09, MSE is calibrated & ready to go. Awaiting DNB. Jun 10 2009 10:34AM (sscott) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes All systems are on and functional Jun 29 2010 12:56PM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes PMT Neuts_hards, ssd_x01, ssd_x02, ssd_x03 Jun 26 2010 09:21PM (irby) Jim Irby X-Ray/Neutron Detectors at K-Hor irby
NINJA no Capillaries tested in-vessel. Jun 28 2010 08:08PM (labombard) Brian LaBombard NINJA gas puff labombard,terry
PCI yes Operational. AM (2 * 39.51) MHz. Dec 13 2010 05:29PM (ntsujii) Miklos Porkolab Phase Contrast Imaging ennever,ntsujii,porkolab
Penning Gauges no High voltage power supplies are turned off, waiting for work at A-port horizontal to be finished. Jun 28 2010 08:07PM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. Jul 01 2009 09:46AM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe
Polarimeter no Safe for Machine Entry Sep 14 2007 12:17PM (irby) Jim Irby C-Mod Polarimeter irby
Power - Alternator Air Switch yes Jun 26 2010 11:19PM (dekow) Gary Dekow feeds all the other supplies cochran,dekow,dterry,irby
Power - PEI yes Jun 26 2010 11:19PM (dekow) Gary Dekow PEI System cochran,dekow,dterry,irby
Power - TMX yes Jun 26 2010 11:19PM (dekow) Gary Dekow Ef2s,. EFCs and A-Coils byford,cochran,dekow,dterry,irby
Power Systems yes Jun 26 2010 11:20PM (dekow) Jim Irby C-Mod Magnet Supplies byford,cochran,dekow,dterry,irby
Probe Array - ISD yes Operational. Jun 28 2010 08:03PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes Operational. Jun 28 2010 08:03PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes F and J outer divertor probes are operational. Jun 28 2010 08:04PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard
Probe Array - UDIV yes Operational, except probe#13 Jun 28 2010 08:04PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes As of 1101123, the 60, 88u, 88l, 140 and variable set at 115GHz are operational. The 50, 75 and 112 are nonoperational. On 1101123, the noise band at ~200kHz is again seen on the 88u and 88l channels. Nov 23 2010 09:30AM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Operational. New Langmuir-Mach probe head installed. Jun 28 2010 08:05PM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes Operational. Jun 28 2010 08:05PM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP yes Both A and K units are operational. Coil polarity needs to be checked. Jun 28 2010 08:06PM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
Sparker yes HV supply on, cable run to sparker at k-hor Jun 23 2010 02:41PM (irby) Jim Irby Field Emission Preionization for C-Mod dekow,irby,parkin
Surface Science Station yes SSS installed and leak tested. Oct 21 2010 11:31AM (ochoukov) Bruce Lipschultz Radially scanning probe located on K-port blip,ochoukov
TCI yes No new CO2 detector, so still missing edge channels Jun 23 2010 02:40PM (irby) Jim Irby Two-Color Interferometer irby,murray
TS - Core yes Operating with 2 lasers Oct 22 2010 01:06PM (jwhughes) Jerry Hughes Core Thomson scattering jwhughes,yma
TS - Edge yes Operational Jul 14 2010 11:54AM (jwhughes) Jerry Hughes Millimeter resolution edge Thomson scattering jwhughes,yma
Vispec no 350 and 670 nm, 4 spatial channels Nov 28 2007 09:58AM (agraf) Alex Graf Visible Spectrometer agraf
XEUS yes Raw spectra stored but not line brightness time histories are going into the tree yet. Jan 20 2011 10:45AM (mlreinke) Matt Reinke X-ray Extended Ultraviolet Spectrometer mlreinke
XTOMO yes Core system working. Edge system waiting for H-modes. Jul 01 2010 11:55AM (mlreinke) Bob Granetz X-Ray Tomography granetz,mlreinke

Session Leader Comments
Jan 21 2011 09:00:46:533AM	1110121001	Darin Ernst	Repeat shot 11101200030
Jan 21 2011 09:12:15:080AM	1110121001	Darin Ernst	Repeat shot 11101200030 RESULT: Late H-Mode near 0.94s, ITB ne0max ~ 4.5. Sawteeth remained. Very similar J-port fault on third pulse as in 11101200030, but not exactly same. DNB current sags during H-mode (not typical). Zeff was much lower this shot (about 1.5 from Zave), compared to 2.8 in 0030. NEXT: repeat
Jan 21 2011 09:31:07:083AM	1110121002	Darin Ernst	Nice ITB, lost sawteeth around 1.0 sec, ne0 goes from 4.0 to 5.2. Prad keeps ramping throughout. Zeff jumps from 1.7 to 2.7 when sawteeth disappear. This shot was nearly identical to shot 30 (last shot yesterday), except that ne0 and Te0, Ti0 sag a little more after 1.3 sec. RF looks perfect. NEXT: keep same setup, but add in a 1 MW on-axis pulse at 1.2 sec, to blast Te0 up when the density is most peaked. Keep the same 0.6 MW pulse train after this.
Jan 21 2011 10:02:43:627AM	1110121003	Darin Ernst	Two H-modes, back transition & J-port fault at top of J-port ramp. Looks like an injection near 0.785 sec terminated H-Mode and faulted J. Actually a nice ITB, as pointed out by Steve Wolfe. ne0 peaks 1.4 sec near 5.2. The on-axis pulse at 1.4 caused ne0 to drop back to 4, but it did level off Prad. The first large on-axis pulse didn't hinder the ITB ne0 rampup much. Lost sawteeth at 1.16, just before first on-axis pulse. Te0 goes downhill starting 1.237 s, but Te(r) doesn't hollow. GPI was disabled up through this shot...M. Churchill turning it on... NEXT: repeat, this time turning off the injection...
Jan 21 2011 09:54:05:370AM	1110121004	Darin Ernst	Late H-mode at 0.86 sec. Got medium ITB with ne0 ~ 4, peaking ag 1.2 sec. Sawteeth remained. First on-axis pulse dropped ne0 to ~3. Prad leveled starting 1.26 sec. NEXT: Move E preheat and J-port ramp earlier by 100ms to start at 0.5 sec, leave on-axis pulses same.
Jan 21 2011 10:10:59:013AM	1110121005	Darin Ernst	Moving heating earlier by 100ms did move H-Mode earlier. Nice ITB with ne0 ~ 4.7, but break in slope in prad_bolo around 1.0 sec. Te0 drops sharply starting 1.0 sec. This is where we lost sawteeth. Classic impurity accumulation: Zeff increases from 2 to 3 starting 1.0 sec. NEXT: Move on-axis pulses 100 ms earlier.
Jan 21 2011 10:35:36:667AM	1110121006	Darin Ernst	Good ITB with ne0_max ~ 4.4 near 1.12 sec. On-axis timing good. Hindered by J-port fault just before first on-axis pulse. Move J-port fault to end of discharge. NEXT: repeat
Jan 21 2011 10:46:05:387AM	1110121007	Darin Ernst	Good ITB with ne0_max taking off when sawteeth disapear around 1.0. ne0 ~ 5.2 at 1.07 s. Nothing obvious on PCI. There was a J port fault at the tail end of the first E port pulse. This shot very similar to 2, better than 5, but drooped more than 2 b/c of the RF fault. Best shot so far is 2, which was not quite as good as 30. NEXT: repeat with 1.2 MW first E port pulse at 1.1 sec.
Jan 21 2011 11:01:01:060AM	1110121008	Darin Ernst	Very similar to 2,5,7 up through end of 1st on-axis pulse. But saw a much larger impurity pileup after sawteeth disappeared at 1.0 s. J faulted after 2nd on-axis pulse. PCI does show some interesting changes during the first on-axis pulse on this shot, from 1.1 - 1.25 sec. QC freq. appears to move from 70 kHz to 125, then falls to 110 kHz. Response trails Te0. NEXT: try a small on-axis pulse at 1.0 sec, to try to reduce impurity pileup, without compromising ne0 too much.
Jan 21 2011 11:30:53:670AM	1110121009	Darin Ernst	Not that great. ne0 reached 4.0, then seemed to have partial back-transition at 1.15 s. PCI shows QC freq. increasing sharply during first on-axis heating pulse, trailing Te0. Prad has been increasing with shot number -- are we burning through the boronization? PCI sees some increase in broadband during the first on-axis pulse, in phase with Te0. Repeat.
Jan 21 2011 11:32:06:610AM	1110121010	Darin Ernst	bonked early. NEXT: Draw out first 400kW on-axis 50ms earlier in effort to control impurity accum, and blast it with 1.8 MW on the first on-axis pulse at 1.1 s.
Jan 21 2011 11:39:22:430AM	1110121011	Darin Ernst	ITB forming, not hindered much by early on-axis warming. ne0 ~4 a little after back-transition, which appears to be caused by first J-port fault. NEXT: repeat
Jan 21 2011 11:56:32:677AM	1110121012	Darin Ernst	Lost H-Mode ~1.02 sec due to impurity accumulation starting 0.96 sec. Looks like boronization not lasting. Back to the game of trying to stay in H-mode after the ITB begins to radiate. Raise target density to 1.1. Raise on-axis early ITB heating to 400 kW from 200 kW, starting 0.95 sec.
Jan 21 2011 12:14:18:377PM	1110121013	Darin Ernst	Lost H-Mode ~1.13 sec. Looks like an injection. The 400 kW on-axis warming starting 0.95 sec was too strong, and halted the density rise. It did not seem to help lower Prad. So get rid of the warming -- the extra heat may be increasing the impurity source. Lower E-port power to 1.5 MW in case got injection from E. ne_tgt=1.1.
Jan 21 2011 12:29:05:017PM	1110121014	Darin Ernst	Lost H-mode 2x, but 2nd H-mode shows ne0 ~ 4.4 at 1.1 s, with on-axis control (too strong, though). NEXT: Increase J-port power by 400 kW.
Jan 21 2011 12:46:24:793PM	1110121015	Darin Ernst	Good shot. Increased J-port power to about 2.7 MW. This helped stay in H-mode. Had partial back transition and J fault 1.16sec, as Prad spiked up during the first on-axis pulse. Comes from edge and drops Te8 sharply, as in previous shots. NEXT: Move first on-axis pulse to 1.0 sec.
Jan 21 2011 01:09:42:463PM	1110121016	Darin Ernst	Good shot. Stayed in H-Mode. ne0 ~ 4.7 at 1.01 s during first on-axis pulse, which dropped ne0 to 3.2. Central density then recovered to ne0 ~ 5 at 1.58 s. ne0 was around 4 during each on-axis pulse. Want larger swings in Te0 at higher ne0. First pulse successfully prevented spike in Prad and associated back-transition. NEXT: Turn 1st pulse down to 600 kW and ramp successive pulses up in 200 kW increments.
Jan 21 2011 01:22:52:043PM	1110121017	Darin Ernst	Good shot. Stayed in H-Mode. Nice RF, only one fault near end. Held ne0 ~ 5 from 1.1 - 1.2 s. Check PCI arond 1.14 sec: nothing obvious. NEXT: on axis powers 0.6, 1.5, 0.2, 0.2, 0.2, 1.6
Jan 21 2011 01:39:04:393PM	1110121018	Darin Ernst	ne0 ~ 4 at 1.03 s, 2nd on-axis pulse too strong. Then back-transition, and very low sustained Te0. Recovers by last RF pulse. Got large swing in Te0 on last pulse, but not with very high ne0. NEXT: Switch from E to D port to check if Prad rise is coming from E. On axis powers: 0.8 MW all pulses
Jan 21 2011 02:02:25:160PM	1110121019	Darin Ernst	With D-port, Prad signature is similar. Probably not coming from E. Looks like impurity accum. does not lower Te0 until starting 1.05 s. So delay on-axis pulses to 1.06, keep 800 kW. NEXT: delay on-axis pulses to 1.06 s.
Jan 21 2011 02:11:10:550PM	1110121020	Darin Ernst	Good until back-transition. Prad cooling began at 0.92 sec. ne0 ~ 5 max @ 1.054 s. First on-axis pulse drops ne0 from 5 to 4. Check PCI around 1.06 s. Problem is that Te0 cooled drastically before 1st on-axis pulse. NEXT: move on-axis pulses to 1.0 s, 40ms on, 60 ms off.
Jan 21 2011 02:29:01:963PM	1110121021	Darin Ernst	NEXT: no Ar puff. Start on-axis pulsetrain at 1.2 sec.
Jan 21 2011 02:36:33:143PM	1110121021	Darin Ernst	Lost H-mode 1.09 s. ne0 ~ 5, got a nice swing in Te0, peaking near 1.03 s, reaching 2 keV. Good candidate for PCI fluctuations. Radiatoin cools core immediately after 1st on-axis pulse. One of the better shots. NEXT: no Ar puff. Start on-axis pulsetrain at 1.2 sec.
Jan 21 2011 02:52:55:553PM	1110121022	Darin Ernst	This case w/o Ar looks similar to the other cases. So the rapid impurity buildup is probably not Ar. NEXT: Try lowering the J-port power as suggested by Steve Wolfe, using 1060726022 as a basis as suggested by Catherine Fiore. This has a 2MW preheat, which was D,E, followed by 1 MW J-port. This may help reduce the impurity influx. Our Zeff and target densities are nearly the same as in the 2006 case. We will bring J down to 1.5 MW from a peak of 2 MW preheat (we will use J for the preheat instead of D,E, since we have more power available in J now than in 2006). We will keep the D-port pluses starting 1.2 sec.
Jan 21 2011 03:08:20:053PM	1110121023	Darin Ernst	Got impurity buildup rapidly in the first two H-Modes. First H-mode did have an ITB with ne0 following the previous shots closely. nel also followed prevvious shots closely. NEXT: Try D,E preheat instead of J.
Jan 21 2011 04:31:53:593PM	1110121024	Darin Ernst	** Great shot. Nice strong ITB. ne0~5.5. Great swings on Te0 with large sawteeth during on-axis pulses. Stays in steady state from 1.25 s onward. PCI sees bursts during on-axis heating. NEXT: on-axis pulses: Delay to 1.3 sec, 60ms on, 40ms off. Increase to 1MW. Want to synch with DNB (every 100ms) and CXRS (every 20ms).
Jan 21 2011 03:39:09:400PM	1110121025	Darin Ernst	Lost H-Mode 1.0 sec. No real ITBs. Looks identical to 24 in early phase. Prad slightly lower than 24. NEXT: Try turning J-power up from 1.5 MW to 1.7 MW.
Jan 21 2011 03:57:03:513PM	1110121026	Darin Ernst	Lost H-Mode 1.0 sec. No real ITBs. Similar. Spike in Prad at 0.925 s. SXR takes off -- heavy metal (S. Wukitch). NEXT: Start E-port preheat rampdown at 0.7 instead of 0.8, ending at 0.8 sec. Cut J back to 1.5 MW.
Jan 21 2011 04:26:24:870PM	1110121028	Darin Ernst	Lost H-Mode 0.8 sec. Prad evolution looks same as previous shots starting at 24. NEXT: Try Steve Wukitch's neon trick. Go back to heavy preheat with E-port, crank up J-port again to 2.5 MW.
Jan 21 2011 04:41:54:817PM	1110121029	Darin Ernst	Lost H-Mode 1.0 sec. Prad evolution similar but 2x larger. Central density closely follows shot #2, better than more recent shots. NEXT: Try reducing neon. Rotate PCI mask 6 degrees.
Jan 21 2011 04:59:30:170PM	1110121030	Darin Ernst	It worked. Best ne0 of the day, reaching 6. Stays to 1.4 or so before falling sharply. Te0 had dropped significantly, but in part due to power rampdown. NEXT: start on axis pulses at 1.16 s, 1 MW each.
Jan 21 2011 05:20:37:500PM	1110121031	Darin Ernst	Another great shot, hitting ne0 ~ 6 at 1.18 sec. On-axis heating timed nicely, but needed more of it at this density. Didn't lose H-mode until 1.3 sec or so. PCI might see something. Mask set to 6 degrees. Based on QC mode, Paul thinks we are looking at the upper half of the cross-section. ------- THANK YOU TO ALL WHO ADVISED ME ON THIS RUN.

Physics Operator Comments
Jan 21 2011 09:09:23:953AM	1110121001	Yijun Lin	Reload shot 1110120030, Ip 0.8 MA. Bt 5.5 T, nl04 1.0e20 m^-2 Load at 21-Jan-2011 08:26:17.00 Open tree /home/ylin/pcs_scratch -1 Open tree done result: plasma. full length. H-mode. next: same plasma. Reduce prepuff by 2 ms.
Jan 21 2011 09:22:20:997AM	1110121002	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL result: plasma full length. H-mode. Next: repeat. no dpcs change.
Jan 21 2011 09:38:40:823AM	1110121003	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL result: plasma full length. H-mode. Next: repeat. reduce prefull 2 ms more. to 53 ms.
Jan 21 2011 09:49:05:827AM	1110121004	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL result: plasma full length. H-mode. Next: repeat. reduce prefull 2 ms more to 51 ms
Jan 21 2011 10:07:05:730AM	1110121005	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL result: plasma full length. H-mode. bouncer in startup. It could be too due to too low prefill pressure (I have been lowering the prepuff). Next: same plasma. lengthen prefill back to 54 ms.
Jan 21 2011 10:26:59:680AM	1110121006	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL result: plasma full length. H-mode. bouncer in startup. Next: increase IC_EF4U from -1293 to -1285 A. lengthen pre-fill to 55 ms. Same plasma.
Jan 21 2011 10:38:17:743AM	1110121007	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL result: plasma full length. H-mode. no more bouncer in startup (changing IC_EF4U helped) Next: no dpcs change.
Jan 21 2011 11:08:16:377AM	1110121009	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL result: plasma full length. H-mode. breakdown is getting later. Next: shorten prefill by 1 ms.
Jan 21 2011 11:24:34:960AM	1110121010	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL result: disrupted 0.28 sec (due to injection at 0.25 sec) Next: no dpcs change.
Jan 21 2011 11:37:13:440AM	1110121011	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL result: plasma full length. startup ok. Next: repeat. no dpcs change.
Jan 21 2011 11:52:29:007AM	1110121012	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.0e20 m^-2, SNL result: plasma full length. startup ok. Next: raise target density to 1.1e20 m^-2. to get more EDAish.
Jan 21 2011 12:23:53:670PM	1110121014	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: plasma full length. late breakdown. Next: repeat. no dpcs change.
Jan 21 2011 12:40:19:547PM	1110121015	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: plasma full length. start up ok. Next: repeat. no dpcs change.
Jan 21 2011 12:59:24:740PM	1110121016	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: plasma full length. start up ok. (breakdown a little late, but ok). Next: repeat. no dpcs change.
Jan 21 2011 01:13:41:470PM	1110121017	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: plasma full length. start up ok. Next: repeat. no dpcs change.
Jan 21 2011 01:48:16:513PM	1110121018	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: plasma full length. start up ok. Next: repeat. no dpcs change.
Jan 21 2011 01:48:22:983PM	1110121019	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: plasma full length. start up ok. Next: repeat. no dpcs change.
Jan 21 2011 02:08:55:687PM	1110121020	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: plasma full length. late breakdown. Free-access for IAP C-Mod tour. Next: lengthen prefill by 2 ms.
Jan 21 2011 02:37:01:667PM	1110121021	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: plasma full length. breakdown is late (t > 10 ms). Next: turn off argon. Decrease IC_EF4U from -1283 A to -1293 A (undo the change earlier today). Hopeful the breakdown is earlier.
Jan 21 2011 02:53:12:930PM	1110121022	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: plasma. disruption at 1.64 sec breakdown is normal (so IC_RF4U indeed helped). Next: put argon back.
Jan 21 2011 03:25:27:503PM	1110121024	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: plasma. full length. good shot. breakdown earlier. almost normal. Next: lower IC_EF4U from -1298A to -1303A.
Jan 21 2011 03:39:09:390PM	1110121025	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: plasma. full length. good shot. breakdown at normal time (@5.4 ms) startup ok. Next: no dpcs change. repeat.
Jan 21 2011 03:52:26:240PM	1110121026	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: plasma. full length. good shot. startup ok. Next: no dpcs change. repeat.
Jan 21 2011 04:12:16:683PM	1110121027	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: fizzle (density did not rise. reason unclear). Next: no dpcs change. repeat.
Jan 21 2011 04:21:18:480PM	1110121028	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: plasma full length. Next: no dpcs change. repeat.
Jan 21 2011 04:29:20:430PM	1110121028	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: plasma full length. Next: Add 2 psi Ne in H-bottom Program PG5, 0.35 to 0.45 sec at 70 V. Add dpcs_piezo_chopper outputs "h_bot".
Jan 21 2011 04:34:50:860PM	1110121029	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: plasma full length. Got Ne puff. startup ok. Next: Lower Ne puff voltage to 50 V.
Jan 21 2011 05:02:17:183PM	1110121031	Yijun Lin	programed: Ip=0.8 MA. Bt=5.5 T, nl04=1.1e20 m^-2, SNL result: plasma full length. Got Ne puff. startup ok. Good ITB shot. Next: end of run.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:00:21:957AM	Plasma	Ok
2	09:13:14:113AM	Plasma	Ok
3	09:28:09:193AM	Plasma	Ok
4	09:42:33:983AM	Plasma	Ok
5	09:58:04:230AM	Plasma	Ok
6	10:14:08:727AM	Plasma	Ok
7	10:29:58:457AM	Plasma	Ok
8	10:46:23:490AM	Plasma	Ok
9	11:01:41:960AM	Plasma	Ok
10	11:17:17:377AM	Plasma	Ok
11	11:30:30:273AM	Plasma	Ok
12	11:45:56:713AM	Plasma	Ok
13	12:02:17:490PM	Plasma	Ok
14	12:17:22:860PM	Plasma	Ok
15	12:34:09:460PM	Plasma	Ok
16	12:53:21:723PM	Plasma	Ok
17	01:08:46:780PM	Plasma	Ok
18	01:25:34:773PM	Plasma	Ok
19	01:42:10:167PM	Plasma	Ok
20	01:58:09:520PM	Plasma	Ok
21	02:25:03:953PM	Plasma	Ok
22	02:40:38:557PM	Plasma	Ok
23	02:56:44:737PM	Plasma	Ok
24	03:13:01:810PM	Plasma	Ok
25	03:32:01:837PM	Plasma	Ok
26	03:46:49:090PM	Plasma	Ok
27	04:02:14:977PM	Plasma	Ok
28	04:14:38:813PM	Plasma	Ok
29	04:29:34:100PM	Plasma	Ok
30	04:44:55:090PM	Plasma	Ok
31	04:59:46:207PM	Plasma	Ok