Alcator C-Mod Run 1070803 Information

Miniproposals

Miniproposal: 498

Date Filed: 7/10/2007

Title: Density Peaking at Low Collisionality

First Author: Martin Greenwald

Session Leader: Martin Greenwald (shots 1-30)

Operators
Session leader(s):	Martin Greenwald
Physics operator(s):	Joseph Snipes
Engineering operator(s):	Andy Pfeiffer,Bill Parkin,Ed Fitzgerald,Gary Dekow

Engineering Operator Run Comment
MP 498 Density peaking at low collisionality Session Leader: M Greenwald

Session Leader Plans

Entered: Aug 3 2007 08:52:51:570AM

Author: Martin Greenwald

We are running MP 498 Density peaking at low collisionality

The purpose of the experiment is to Extend data range, in the nu_EFF, q95 plane, for particle transport experiments and to investigate density peaking at low collisionality.

Previous work at C-Mod and elsewhere have shown clear evidence of density peaking in H-modes at low collisionality. Data from AUG, C-Mod and JET suggest that the density profile for a low collisionality device like ITER will have a peaking ratio, ne(0)/ ~ 1.4-1.6. This result has important implications for fusion gain on ITER and may also affect its stability through modifications in the pressure profile and bootstrap current. It may also impact the divertor behavior through the relative drop in edge density. Thus it is important to gather data which will strengthen our understanding and lead to more reliable predictions.

We will use the cryopump to help keep the density down.
We will try to follow the approach from 1070614 (which was H-mode cryopump studies.) Shot 13 is a good example of what we're look for. In that run, ssep was scanned from slightly negative to slightly positive - hysteresis and a healthy amount of RF power was sufficient to maintain the H-mode. However we want to avoid control problems associated with the ssep control. An option - to be discussed by operators - is to hold the xpoints fixed and move Zcur.

0. Start with
The machine should be boronized.
The cryopump should be available
Ip = 0.7MA
Bt = 5.4 T
target nl_04 = 0.6e20

1. Once we have established an approach, try to find the lowest density where H-mode is accessible.

2. Drop Ip to 0.5 MA - scan down in density

3. Drop Ip to 0.4 MA - scan down in density

4. At 0.4 MA - raise density in steps until H-mode is lost

5. Raise Ip to 0.85 MA - scan to lowest density

We will want some Argon for HIREX, gas puff for IW CXR, DNB for other CXR

Physics Operators Plans

Entered: Aug 2 2007 03:03:49:497PM

Author: Joseph Snipes

Physop and Engineering Setup for Friday, 1070803

MP 498 Density peaking at low collisionality

Session Leader: M Greenwald
Physop: J A Snipes

***Overnight boronization (8 hours) ***
40 mTorr pressure
Min Dwell Max
60 75 80 cm

Power systems as on 1070802021

A-coil configuration: normal [Dtop -Dbot -Jtop +Jbot] and 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)
fill NINJA with 10 psi deuterium Hybrid Enabled

Enable the following gate valves and shutters: ECE, VUV, Z-bolo shutters, DNB

Torvac setup: Gate valves open during pulse.

ICRF: D E and J-port ready at the beginning of run
LH: Not needed

The goal is to extend the range of low density H-modes in the nu_eff, q95 plane, That will require Line-AVERAGE densities below 2e20 and current below 1 MA.

0. Start with
Ip = 0.7MA
Bt = 5.4 T
target nl_04 = 0.6e20

1. Once we have established an approach, try to find the lowest density where H-mode is accessible.

2. Drop Ip to 0.5 MA - scan down in density

3. Drop Ip to 0.4 MA - scan down in density

4. At 0.4 MA - raise density in steps until H-mode is lost

5. Raise Ip to 0.85 MA - scan to lowest density

We will want some Argon for HIREX, gas puff for IW CXR, DNB for other CXR

Session Leader Summaries

Entered: Aug 3 2007 05:28:41:683PM

Author: Martin Greenwald

We had a pretty good day with 28 plasmas

It was not possible to lower the collisionality as far as we wished, nu_eff never got much below 1. However we did get a scan in q95 and beta, so combined with previous runs we should be able to compare scalings with AUG and JET.

Shots for further analysis:

1070803001
1070803003
1070803004
1070803009
1070803011
1070803013
1070803018
1070803019
1070803020
1070803021
1070803023
1070803024
1070803025
1070803028
1070803029

Physics Operator Summaries

Entered: Aug 3 2007 05:10:48:773PM

Author: Joseph Snipes

It was a good run. There were a few concerns over high OH coax resistance that reached up to 3 uOhms but we kept running and the resistance came down. The cryopump performed very well and so did the ICRF. The ICRF power reached 5 MW briefly and 4 MW for 100 ms on the last shot. There were a large number of H-modes that will provide interesting data for a number of people including two-phase L-H transitions with upper null plasmas. Depending on your definition of a fizzle, there were 29 shots and 29 plasmas, no duds and no errors. One plasma only reached 150 kA so it could be considered a fizzle. The startup worked well otherwise. There were 5 early disruptions at low density due to moly injections. The boronization did not seem all that effective at keeping moly levels low when operating at high RF power and low density.

Shot,Duration(s),Ipmax(MA),Result Shot,Duration(s),Ipmax,Result
| 01 1.988 0.671 Plasma | 02 0.850 0.692 Plasma |
| 03 1.995 0.721 Plasma | 04 1.994 0.698 Plasma |
| 05 0.691 0.706 Plasma | 06 0.627 0.697 Plasma |
| 07 1.998 0.694 Plasma | 08 1.995 0.761 Plasma |
| 09 1.991 0.762 Plasma | 10 0.625 0.758 Plasma |
| 11 1.989 0.736 Plasma | 12 0.321 0.659 Plasma |
| 13 1.988 0.729 Plasma | 14 1.989 0.647 Plasma |
| 15 1.725 0.644 Plasma | 16 1.982 0.635 Plasma |
| 17 1.984 0.633 Plasma | 18 1.746 0.636 Plasma |
| 19 1.984 0.612 Plasma | 20 1.989 0.635 Plasma |
| 21 1.987 0.638 Plasma | 22 0.030 0.140 Plasma |
| 23 1.992 0.627 Plasma | 24 1.984 0.677 Plasma |
| 25 1.993 0.682 Plasma | 26 1.980 0.761 Plasma |
| 27 1.984 0.762 Plasma | 28 1.756 0.755 Plasma |
| 29 1.982 0.772 Plasma
Date 1070803: 29 shots. 29 plasmas. 0 fizzles. 0 duds. 0 System Error.
(Plasma = Ip gt 60.0 kA Dud = H_alpha lt 0.40 V)
Total plasma duration: 48.14 s (exceeding -67 kA)

Session Leader Comments

Aug 3 2007 09:33:27:837AM 1070803001 Martin Greenwald Good shot, steady H-mode
Ip = 0.6 MA
q95 = 6.1
H-mode density 1.9 dropping to 1.6
nu_eff ~ 2.0
ne0/ ~ 1.34

Aug 3 2007 09:33:13:150AM 1070803002 Martin Greenwald Disrupted early 0.8 sec

Aug 3 2007 10:11:10:990AM 1070803003 Martin Greenwald Good shot, steady H-mode
EDA with strong QC mode
frequency responds to topology change - rotation?

Ip = 0.6 MA
q95 = 6.1
H-mode density 1.6
nu_eff ~ 1.3
ne0/nev ~ 1.4

Aug 3 2007 10:15:00:887AM 1070803004 Martin Greenwald Good shot, steady H-mode
ELMs late, break up QC mode
Ip = 0.6 MA
q95 = 6.1
H-mode density 1.7
nu_eff ~ 2.2
ne0/nev ~ 1.4

Aug 3 2007 10:38:27:473AM 1070803005 Martin Greenwald Disrupts early 0.68
apparently triggered by injection

Aug 3 2007 10:57:45:043AM 1070803006 Martin Greenwald Disrupts early 0.68
apparently triggered by injection

Aug 3 2007 05:07:10:207PM 1070803007 Martin Greenwald Shot went through, but only a brief H-mode

Aug 3 2007 11:20:55:790AM 1070803008 Martin Greenwald Shot went through, but only a brief H-mode

Aug 3 2007 11:42:19:300AM 1070803009 Martin Greenwald Somewhat longer H-mode, RF power still unsteady
Brief period to analyze data
Ip = 0.7 MA
q95 = 5.1
H-mode density 1.4
nu_eff ~ 0.66
ne0/nev ~ 1.4

Aug 3 2007 11:51:55:420AM 1070803010 Martin Greenwald Disrupts early, 0.6 sec

Aug 3 2007 12:26:36:350PM 1070803011 Martin Greenwald Good shot - long H-mode with just one interuption
ELMs apear late, no sign of EDA

Aug 3 2007 05:27:10:337PM 1070803012 Martin Greenwald v. early disruption

Aug 3 2007 01:02:02:970PM 1070803013 Martin Greenwald Several H-modes, last one probably long enough to analyze
Small ELMs again late, no QC mode
Ip = 0.7
nu_eff = 1.56
n peaking = 1.42
q95 5.3

Aug 3 2007 01:16:17:627PM 1070803014 Martin Greenwald Lower Ip to 0.5 MA
Prf up to 2.5 MW, but no H-mode

Aug 3 2007 01:18:00:283PM 1070803015 Martin Greenwald L-mode again
late disruption from Li pellet

Aug 3 2007 05:06:27:300PM 1070803016 Martin Greenwald L-Mode

Aug 3 2007 01:55:05:920PM 1070803017 Martin Greenwald Ragged H-modes
faulting on icrf

Aug 3 2007 02:14:53:177PM 1070803018 Martin Greenwald Steadier H-mode
Ip = 0.5 MA
nu_eff = 2.00492
n peaking = 1.48428
q95 6.97902

Aug 3 2007 02:29:20:660PM 1070803019 Martin Greenwald Steadier H-mode
scanning to higher density
Ip = 0.5 MA
nu_eff = 2.33203
n peaking = 1.45559
q95 7.06522

Aug 3 2007 02:48:34:560PM 1070803020 Martin Greenwald raise density a bit more
H-mode, but brief
RF has problems with neutral density

nu_eff = 3.60678
n peaking = 1.26375
q95 7.18495

Aug 3 2007 05:05:57:407PM 1070803021 Martin Greenwald Longish H-mode
Some RF tripping

Aug 3 2007 03:13:27:997PM 1070803022 Martin Greenwald fizzle

Aug 3 2007 03:32:28:377PM 1070803023 Martin Greenwald Good shot
nu_eff = 1.06376
n peaking = 1.48515
q95 7.3787

Aug 3 2007 03:46:30:830PM 1070803024 Martin Greenwald Ip up to 0.6
OK shot
several H-modes
nu_eff = 1.23884
n peaking = 1.35539
q95 5.96776

nu_eff = 2.02805
n peaking = 1.31670
q95 5.9431

Aug 3 2007 04:01:50:067PM 1070803025 Martin Greenwald Several H-modes
nu_eff = 3.49007
n peaking = 1.28985
q95 5.90335

Aug 3 2007 04:19:58:967PM 1070803026 Martin Greenwald Many H-mode periods
RF trips

Aug 3 2007 04:37:45:677PM 1070803027 Martin Greenwald Many brief H-modes
radiation high

Aug 3 2007 04:50:01:903PM 1070803028 Martin Greenwald Many small H-modes, first one may OK
nu_eff = 2.71171
n peaking = 1.25090
q95 5.31135

Aug 3 2007 05:02:42:793PM 1070803029 Martin Greenwald Power up to 4 MW
Got one longish H-mode, the a couple of short ones
nu_eff = 1.75873
n peaking = 1.24394
q95 5.18969

Aug 3 2007 05:33:54:813PM 1070803030 Steve Scott MSE beam-into-gas calibration shot, no fields
request shot like 1070801038 except that torus gas will be deuterium.
request about 3 mTorr pressure

result: good DNB. good pressure. torus pressure is just a little over 3 mTorr, so we'll ask
the phys op to reduce the pressure 15% on the next shot.

Aug 3 2007 05:36:03:363PM 1070803030 Jin-Seok Ko MSE spectrum measurement in the D-filled torus

Load: 1070801038
Gas: Deuterium with g-side rat ~ 1 (3 mTorr in g-side mks)
DNB: starts at 0.4 sec for 1.4 sec with a long pulse

McPerson spectrometer ON

Shot 30 went good.

Ibeam 6.4->4.5A
Gas a little higher. 15% reduction for the next shots

Aug 3 2007 05:41:33:887PM 1070803031 Steve Scott good dnb. very similar to previous shot. 6 amps, drooping down to about 4.5 at end of the shot.
got reduced torus pressure as requested. very similar to the pressure waveform on 1070801038.
this is another winner and an esteemed member of our scan.

Aug 3 2007 05:43:07:513PM 1070803031 Jin-Seok Ko
Shot 31 went good.

Ibeam 6.3->4.4A

Aug 3 2007 05:51:01:537PM 1070803032 Steve Scott
good dnb. one tiny fault. good pressure.
this is the third and last shot of this sequence. we are done for the day.

Physics Operator Comments

Aug 3 2007 09:15:48:550AM 1070803001 Joseph Snipes Shot 1: Began where Ian left off yesterday keeping what was already in the model, which is a 0.6 MA, 5.4 T, 4 x 10^19 m^-2 plasma with a ramp from negative to positive ZCUR between 0.7 and 0.9 s. Changed prepuff to 30 ms duration to account for the cryopump, which is on. Good shot.

Aug 3 2007 09:32:31:790AM 1070803002 Joseph Snipes Shot 2: Increased prepuff by 2 ms to 32 ms duration. Disrupted at 0.84 s. OH1 breaker pulled out at the end of the shot. Short pause to investigate.

Aug 3 2007 09:55:58:927AM 1070803003 Joseph Snipes Shot 3: Corrected a few jumps at segment switch between segment 1 and segment 4 at 0.1 s. Increased prepuff by 2 ms to 34 ms duration. Good shot.

Aug 3 2007 09:57:23:380AM 1070803004 Joseph Snipes Shot 4: Increased prepuff by 3 ms to 37 ms duration. Increased TF and OH invert times from 2.3 s to 2.4 s. Decreased nl04 to 3 x 10^19 m^-2.

Aug 3 2007 10:22:23:847AM 1070803004 Joseph Snipes Shot 4: Increased prepuff by 3 ms to 37 ms duration. Increased TF and OH invert times from 2.3 s to 2.4 s. Decreased nl04 to 3 x 10^19 m^-2. Good shot.

Aug 3 2007 10:48:02:533AM 1070803005 Joseph Snipes Shot 5: Increased pre-programmed gas from PG1 in segment 1 from 18 ms to 40 ms to 40 V to avoid the early runaways. Moved ZCUR ramp earlier by 100 ms to ramp from 0.6 to 0.8 s. Problem with scopes that Tom is looking into. Disrupted at 0.68 s.

Aug 3 2007 11:01:33:063AM 1070803006 Joseph Snipes Shot 6: Changed CLEARIN predictor time from 0.75 to 0.65 s. Disrupted at 0.62 s.

Aug 3 2007 11:05:50:053AM 1070803007 Joseph Snipes Shot 7: Reduced RCUR by 2.5 mm throughout the shot to increase the outer gap by 0.5 cm. Good shot but the RF tripped early.

Aug 3 2007 11:27:12:953AM 1070803008 Joseph Snipes Shot 8: Raised Ip to 0.7 MA. Good shot, but RF tripped again so the H-mode was short.

Aug 3 2007 11:39:12:170AM 1070803009 Joseph Snipes Shot 9: Try again to keep the RF on. OH coax resistance just exceeds 2.5 uOhm.
Good shot but the RF trips again.

Aug 3 2007 12:00:27:693PM 1070803010 Joseph Snipes Shot 10: Try again. Disrupted at 0.62 s. OH2 breaker pulled after the disruption.
Delay to check fuses.

Aug 3 2007 12:24:17:987PM 1070803011 Joseph Snipes Shot 11: Returned ZCUR ramp to start at 0.7 s and end at 0.9 s. Returned CLEARIN predictor time from 0.65 s to 0.75 s. Good shot. RF stayed up pretty well. OH resistance above 3 uOhms, but Irby says to keep going.

Aug 3 2007 12:28:20:633PM 1070803012 Joseph Snipes Shot 12: Reduced nl04 to 2 x 10^19 m^-2. Disrupted at 0.27 s.

Aug 3 2007 12:47:29:140PM 1070803013 Joseph Snipes Shot 13: Reloaded segment 4 from shot 11. Then, reduced nl04 after 0.35 s down to 2 x 10^19 m^-2. Increased PG1 gas in segment 1 from 0.017 s to 0.04 s. Good shot.
Cryopump warmed up before the shot so it is surprising that there were no problems with the breakdown.

Aug 3 2007 01:06:42:193PM 1070803014 Joseph Snipes Shot 14: Reduced Ip to 0.5 MA. Good shot. L-mode.

Aug 3 2007 01:24:14:993PM 1070803015 Joseph Snipes Shot 15: Reduced RCUR by 2.5 mm to increase the outer gap by 5 mm. Turned off dpcs_ftae2. The Active MHD antennas have been off in any case. Good shot. Disrupted just after a pair of Li pellets at 1.7 s.

Aug 3 2007 01:39:58:747PM 1070803016 Joseph Snipes Shot 16: Stagger the RF to see if D or E are more responsible for the increased Moly levels. Increase J to give a total of 2 MW throughout. Li pellet injected at 1.71 s. Good shot. Moly radiation appears to come from all three antennas and depends on the total RF power level.

Aug 3 2007 01:55:03:170PM 1070803017 Joseph Snipes Shot 17: Ramped nl04 from 3 to 3.5 x 10^20 m^-2 from 0.3 to 0.4 s then constant until 0.6 s. Good shot. Fewer runaways. Some H-modes.

Aug 3 2007 02:08:34:607PM 1070803018 Joseph Snipes Shot 18: Repeat to tune RF. Good shot. Several H-modes.

Aug 3 2007 02:23:52:983PM 1070803019 Joseph Snipes Shot 19: Increased pre-programmed gas in segment 1 just before 0.1 s to try to eliminate the runaways. Increased nl04 to 6 x 10^19 m^-2. Good shot. Nice long H-mode.

Aug 3 2007 02:52:07:407PM 1070803020 Joseph Snipes Shot 20: Reduced early pre-programmed gas before 0.1 s. Raised nl04 to 8 x 10^19 m^-2. Good shot. RF tripped at 0.96 s.

Aug 3 2007 03:07:19:707PM 1070803021 Joseph Snipes Shot 21: Reduced nl04 to 7 x 10^19 m^-2. Raised early gas in segment 1 a little to reduce the early runaways. Good shot. RF tripped but there were a couple of H-modes.

Aug 3 2007 06:02:29:330PM 1070803022 Joseph Snipes Shot 22: Repeat to tune the RF. Fizzle!

Aug 3 2007 03:28:06:933PM 1070803023 Joseph Snipes Shot 23: Repeat to tune the RF. Good shot with a couple of H-modes.

Aug 3 2007 03:43:08:840PM 1070803024 Joseph Snipes Shot 24: Increased Ip to 0.6 MA. Good shot with several H-modes.

Aug 3 2007 03:57:34:107PM 1070803025 Joseph Snipes Shot 25: Repeat. Good shot with several H-modes.

Aug 3 2007 04:28:08:627PM 1070803026 Joseph Snipes Shot 26: Raised Ip to 0.7 MA. Good shot with a number of short H-modes. Nice two-phase L-H transition around 0.95 s with a rise in edge Te and drop in fluctuations occurring about 2 ms before the drop in D-alpha and rise in density.

Aug 3 2007 04:34:58:193PM 1070803027 Joseph Snipes Shot 27: Repeat. Good shot with many brief H-modes.

Aug 3 2007 04:40:56:990PM 1070803028 Joseph Snipes Shot 28: Raised nl04 to 9 x 10^19 m^-2.

Aug 3 2007 04:47:30:057PM 1070803028 Joseph Snipes Shot 28: Raised nl04 to 9 x 10^19 m^-2. Good shot with many H-modes.

Aug 3 2007 05:01:26:747PM 1070803029 Joseph Snipes Shot 29: Repeat with max RF power. Good shot with a few H-modes with up to 4 MW of RF power.

Engineering Operator Comments

Shot Time Type Status Comment

1 09:14:00:300AM Plasma Ok

2 09:27:35:223AM Plasma Bad OH1 selfpowered inbypass

3 09:48:10:557AM Plasma Ok

4 10:08:06:110AM Plasma Ok

5 10:35:05:813AM Test Bad

6 10:48:53:817AM Plasma Ok

7 11:03:15:240AM Plasma Ok

8 11:17:02:613AM Plasma Ok

9 11:33:33:397AM Plasma Ok

10 11:49:48:680AM Plasma Ok disruption caused OH1 SPC to to fire

11 12:08:48:907PM Plasma Ok

12 12:25:53:130PM Plasma Ok

13 12:42:03:320PM Plasma Ok

14 01:00:18:123PM Plasma Ok

15 01:14:20:810PM Plasma Ok

16 01:31:22:643PM Plasma Ok

17 01:49:59:727PM Plasma Ok

18 02:06:10:713PM Plasma Ok

19 02:20:48:527PM Plasma Ok

20 02:37:21:420PM Plasma Ok

21 02:56:51:570PM Test Ok

22 03:11:34:900PM Plasma Ok

23 03:24:52:633PM Plasma Ok

24 03:37:00:473PM Plasma Ok

25 03:55:21:137PM Plasma Ok

26 04:14:34:487PM Plasma Ok

27 04:27:37:003PM Plasma Ok

28 04:41:58:037PM Plasma Ok

29 04:57:32:333PM Plasma Ok

30 05:29:14:730PM Test Ok MSE calibration

31 05:38:17:617PM Test Ok MSE Calibration

32 05:47:33:737PM Test Ok

System Availability

Aug 3 2007 09:13:36:000AM

System Available Comment Availability
Changed Owner Description Who Can
Change
Active MHD yes Fully operational Mar 28 2007 09:19PM (sears) Joe Snipes Active MHD Antenna sears,snipes
BES yes vertical array of six views at R ~ 87.3 cm, radial array of three views out to R ~ 89 cm, both at outboard midplane. Three discrete fiber views of beam at R ~ 70.0, 76.5 and 82.5 cm. Feb 06 2007 10:00AM (bravenec) Ron Bravenec Beam Emission Spectroscopy bravenec
Bolometers yes 2Pi diode operational, 2Pi foil being upgrade for noise resistance. Midplane foils calibrated and operational, data in the tree. Outboard midplane AXUV calibrated and operational, data in the tree. Full midplane and divertor views being digitized. Jul 19 2007 04:48PM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization yes First Boronization 5/9/07 May 10 2007 04:55PM (irby) Jim Irby Boronization dekow,irby
CNPA no Jan 14 2007 02:06PM Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor yes The cryopump is operational in a manual mode. We will be working on interfacing its control system with the C-Mod state machine for semi-automatic operation. May 30 2007 07:58PM (labombard) Brian LaBombard Upper Divertor Cryopump irby,labombard
CXRS yes The pedestal toroidal array was installed, spatially and absolutely calibrated. There are 10 chords intersect the beam at the major_R_range=[75,4:87.4]cm. Spatial resolution: 1.2 cm. The F-top poloidal array was installed and spatially calibrated. There are 19 chords intersect the beam at the major_R_range=[67.8:91.0]cm. Spatial resolution: 1.22 cm. Jun 20 2007 05:35PM (bespam) Bill Rowan Charge Exchange Spectroscopy bespam,blip,rachmcd,rowan
D Alpha yes \ha2_bright and \SPECTROSCOPY::TOP.VUV.VIS_SIGNALS:MCP_VIS_SIG1 are available Mar 11 2007 10:28PM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa yes camera is re-installed, and view has been calibrated Feb 26 2007 03:28PM (marmar) Earl Marmar Visible Bremsstrahlung marmar
Disruption Mitigation no Jan 14 2007 02:02PM Bob 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,ldorf,terry
DNB yes All systems are operational, but as of 28 March 2007, the beam needs additional conditioning for full performance shots Mar 28 2007 09:36AM (beals) Bob Granetz Diagnostic Beam beals,granetz
FRC-ECE no Only high frequency channels now working (17 to 32). Ch 22 has bad video amp. LO is OK. Problem looks to be in mixer amp unit. Jul 11 2007 10:52AM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips
G-Side Ratiomatic yes The gauge is operational. Mar 30 2007 10:54AM (labombard) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
GPC yes Chs 1-8 operational. May 24 2007 08:40AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPC2 yes Most channels (except 1,5,8,10,17) operational. Jun 08 2007 08:29AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPI yes New view just outside of the lower X-point is operational, but data is being archived locally , not to the tree. Midplane GPI is not operational. Mar 27 2007 01:59PM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes spectral calibration needs to be checked, but system should be ready for the run Feb 26 2007 03:28PM (marmar) Earl Marmar H/D Ratio marmar
Hirex Jr yes Mar 06 2007 08:59AM (rice) John Rice High Resolution X-Ray ince,rice
Hirex Sr yes Storing Data, but profiles not yet available Apr 27 2007 01:20PM (ince) John Rice High Resolution X-Ray ince,rice
HXR yes Something might be wrong with channel 26; all others working fine. Mar 23 2007 10:43AM (schmidt) Ron Parker Hard X-Ray Array parker,schmidt
ICRF D-Antenna yes 80.5 MHz. Max power is about 1.5 MW Jun 20 2007 09:23AM (ylin) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna yes 80 MHz. Maxc power is about 1.5 MW Jun 20 2007 09:23AM (ylin) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna yes 78 MHz. 4-strap configuration. Max ~ 3 MW. Jul 17 2007 03:52PM (ylin) Steve Wukitch J-port antenna wukitch,ylin
Lower Hybrid no 6B Pressure window failed. Arcing in 6B, 8B,9B & 23B. May 04 2007 03:44PM (dterry) Ron Parker Lower Hybrid dterry,parker
LPI yes Apr 26 2007 08:35PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha yes Midplane calibrated and operational, data being stored in tree. Divertor views showing significant noise, and not available. Upper view being digitized and analyzed. Jul 19 2007 04:49PM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke
McPherson yes Working normally. Apr 19 2007 09:52AM (mlreinke) Jim Terry VUV Spectrometer mlreinke,terry
Michelson yes Operational. Mar 28 2007 08:33AM (hubbard) Amanda Hubbard ECE Te Profiles hubbard,schmidt
MKS yes E-Top, E-Bottom, F-top (cryo), G-side, and B-bottom are operational. F-top gauge has a 'sniffer tube' to measure pressures in cryopump gas box. Mar 20 2007 06:42PM (g) Brian LaBombard Baratron pressure gauges labombard
MLP no Initial tests on the A-port scanning probe went well. We need to take care of some control glitches that caused some component failures. May 30 2007 08:01PM (labombard) Brian LaBombard Mirror Langmuir Probe Electronics System labombard
MSE no (1) Bandpass filters replacement underway (2) Beam-into-gas spectrum measurement underway (3) Shutter mechanism currently unstable; remains open. (4) Expect beam-into-gas calibrations complete about 4/24. Apr 03 2007 12:05PM (sscott) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes Both neutron systems are fully operational Apr 05 2007 11:19AM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes operational Mar 21 2007 04:29PM (irby) Jim Irby X-Ray/Neutron Detector at K-Hor irby
NINJA yes All capillaries displayed by the NINJA_CONTROL GUI have been tested. NINJA puffed on 1070329009 (A-B limiter). Mar 29 2007 11:47AM (terry) Brian LaBombard NINJA gas puff labombard,terry
PCI yes The system is to be optimized. May 30 2007 01:12PM (lianglin) Miklos Porkolab Phase Contrast Imaging edlund,lianglin,ntsujii,porkolab
Penning Gauges yes 8 in-situ Penning ionization gauges appear to be operational: CB_DivU, CB_OutL, CB_DivL, KA_OutU, KA_OutL, B_DivL, Cryo_1, Cryo_2. Cryo_1 and Cryo_2 are new and installed in the upper cryopump 'gas-box'. Mar 13 2007 10:01PM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV (without an ND filter) are operational. Mar 27 2007 01:53PM (terry) Jim Terry Video of plasma via several cameras dekow,irby,terry,wolfe
Polarimeter no Retro shutter closed Mar 15 2007 11:00AM (irby) Jim Irby C-Mod Polarimeter irby
Probe Array - ISD yes Probes at 15 of the 16 poloidal locations ('ramped' geometry) are operational. n,Te, particle flux reported every 10 ms. Mar 13 2007 09:47PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes All 6 probes on the lower hybrid launcher (tungsten, 1.5 mm projection) are operational. Mar 13 2007 09:46PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes Probes at 10 poloidal locations (one 'ramped' and one 'flush') are operational. n,Te, particle flux reported every 10 ms. Mar 13 2007 09:45PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard
Probe Array - UDIV yes 14 probes are operational ('ramped' geometry). n,Te, particle flux reported every 10 ms.Two high-gain channels are installed and operational for ECDC plasma diagnosis. Mar 13 2007 12:46PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer yes 50, 60, 75 88, 88l,88u and 110 are operational. 60GHz is a little noisy. Variable frequency channel has just been modified (on 1070731) and is being tested. Aug 01 2007 09:15AM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Perpendicular Mach probe head is installed. The drive is operational. Mar 15 2007 09:09PM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP yes Perpendicular Mach probe head is installed. The probe drive is now operational. Mar 13 2007 09:51PM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP yes A-port WASP successfully collected data on 04/04. Some intermittent open circuit on SE Electrode. K-WASP took data on 04/11. Both ready to scan as needed. Apr 12 2007 04:18PM (nsmick) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
TCI yes NL_04 at 71.04 cm from 3/9/07 calibration May 23 2007 07:38AM (irby) Jim Irby Two-Color Interferometer irby,murray
TS - Core yes 2 lasers, 10 spatial channels. Density is calibrated based on ECE cutoffs obtained on 4 May 2007. Additional spatial channels will be added over the next several weeks. Jul 11 2007 09:18AM (jwhughes) Jerry Hughes Core Thomson scattering jwhughes,yma
TS - Edge yes 2 lasers, 20 spatial channels. Fiber holder position is -110.0mm. Density is calibrated according to Raman scattering results from 26 May, supplemented with ECE cutoffs obtained on shot 1070531015. Aug 02 2007 05:52PM (yma) Jerry Hughes Millimeter resolution edge Thomson scattering jwhughes,yma
Vispec yes 350 and 670 nm, 4 spatial channels May 04 2007 01:02PM (agraf) Alex Graf Visible Spectrometer agraf

Session Leader Comments
Aug 3 2007 09:33:27:837AM	1070803001	Martin Greenwald	Good shot, steady H-mode Ip = 0.6 MA q95 = 6.1 H-mode density 1.9 dropping to 1.6 nu_eff ~ 2.0 ne0/ ~ 1.34
Aug 3 2007 09:33:13:150AM	1070803002	Martin Greenwald	Disrupted early 0.8 sec
Aug 3 2007 10:11:10:990AM	1070803003	Martin Greenwald	Good shot, steady H-mode EDA with strong QC mode frequency responds to topology change - rotation? Ip = 0.6 MA q95 = 6.1 H-mode density 1.6 nu_eff ~ 1.3 ne0/nev ~ 1.4
Aug 3 2007 10:15:00:887AM	1070803004	Martin Greenwald	Good shot, steady H-mode ELMs late, break up QC mode Ip = 0.6 MA q95 = 6.1 H-mode density 1.7 nu_eff ~ 2.2 ne0/nev ~ 1.4
Aug 3 2007 10:38:27:473AM	1070803005	Martin Greenwald	Disrupts early 0.68 apparently triggered by injection
Aug 3 2007 10:57:45:043AM	1070803006	Martin Greenwald	Disrupts early 0.68 apparently triggered by injection
Aug 3 2007 05:07:10:207PM	1070803007	Martin Greenwald	Shot went through, but only a brief H-mode
Aug 3 2007 11:20:55:790AM	1070803008	Martin Greenwald	Shot went through, but only a brief H-mode
Aug 3 2007 11:42:19:300AM	1070803009	Martin Greenwald	Somewhat longer H-mode, RF power still unsteady Brief period to analyze data Ip = 0.7 MA q95 = 5.1 H-mode density 1.4 nu_eff ~ 0.66 ne0/nev ~ 1.4
Aug 3 2007 11:51:55:420AM	1070803010	Martin Greenwald	Disrupts early, 0.6 sec
Aug 3 2007 12:26:36:350PM	1070803011	Martin Greenwald	Good shot - long H-mode with just one interuption ELMs apear late, no sign of EDA
Aug 3 2007 05:27:10:337PM	1070803012	Martin Greenwald	v. early disruption
Aug 3 2007 01:02:02:970PM	1070803013	Martin Greenwald	Several H-modes, last one probably long enough to analyze Small ELMs again late, no QC mode Ip = 0.7 nu_eff = 1.56 n peaking = 1.42 q95 5.3
Aug 3 2007 01:16:17:627PM	1070803014	Martin Greenwald	Lower Ip to 0.5 MA Prf up to 2.5 MW, but no H-mode
Aug 3 2007 01:18:00:283PM	1070803015	Martin Greenwald	L-mode again late disruption from Li pellet
Aug 3 2007 05:06:27:300PM	1070803016	Martin Greenwald	L-Mode
Aug 3 2007 01:55:05:920PM	1070803017	Martin Greenwald	Ragged H-modes faulting on icrf
Aug 3 2007 02:14:53:177PM	1070803018	Martin Greenwald	Steadier H-mode Ip = 0.5 MA nu_eff = 2.00492 n peaking = 1.48428 q95 6.97902
Aug 3 2007 02:29:20:660PM	1070803019	Martin Greenwald	Steadier H-mode scanning to higher density Ip = 0.5 MA nu_eff = 2.33203 n peaking = 1.45559 q95 7.06522
Aug 3 2007 02:48:34:560PM	1070803020	Martin Greenwald	raise density a bit more H-mode, but brief RF has problems with neutral density nu_eff = 3.60678 n peaking = 1.26375 q95 7.18495
Aug 3 2007 05:05:57:407PM	1070803021	Martin Greenwald	Longish H-mode Some RF tripping
Aug 3 2007 03:13:27:997PM	1070803022	Martin Greenwald	fizzle
Aug 3 2007 03:32:28:377PM	1070803023	Martin Greenwald	Good shot nu_eff = 1.06376 n peaking = 1.48515 q95 7.3787
Aug 3 2007 03:46:30:830PM	1070803024	Martin Greenwald	Ip up to 0.6 OK shot several H-modes nu_eff = 1.23884 n peaking = 1.35539 q95 5.96776 nu_eff = 2.02805 n peaking = 1.31670 q95 5.9431
Aug 3 2007 04:01:50:067PM	1070803025	Martin Greenwald	Several H-modes nu_eff = 3.49007 n peaking = 1.28985 q95 5.90335
Aug 3 2007 04:19:58:967PM	1070803026	Martin Greenwald	Many H-mode periods RF trips
Aug 3 2007 04:37:45:677PM	1070803027	Martin Greenwald	Many brief H-modes radiation high
Aug 3 2007 04:50:01:903PM	1070803028	Martin Greenwald	Many small H-modes, first one may OK nu_eff = 2.71171 n peaking = 1.25090 q95 5.31135
Aug 3 2007 05:02:42:793PM	1070803029	Martin Greenwald	Power up to 4 MW Got one longish H-mode, the a couple of short ones nu_eff = 1.75873 n peaking = 1.24394 q95 5.18969
Aug 3 2007 05:33:54:813PM	1070803030	Steve Scott	MSE beam-into-gas calibration shot, no fields request shot like 1070801038 except that torus gas will be deuterium. request about 3 mTorr pressure result: good DNB. good pressure. torus pressure is just a little over 3 mTorr, so we'll ask the phys op to reduce the pressure 15% on the next shot.
Aug 3 2007 05:36:03:363PM	1070803030	Jin-Seok Ko	MSE spectrum measurement in the D-filled torus Load: 1070801038 Gas: Deuterium with g-side rat ~ 1 (3 mTorr in g-side mks) DNB: starts at 0.4 sec for 1.4 sec with a long pulse McPerson spectrometer ON Shot 30 went good. Ibeam 6.4->4.5A Gas a little higher. 15% reduction for the next shots
Aug 3 2007 05:41:33:887PM	1070803031	Steve Scott	good dnb. very similar to previous shot. 6 amps, drooping down to about 4.5 at end of the shot. got reduced torus pressure as requested. very similar to the pressure waveform on 1070801038. this is another winner and an esteemed member of our scan.
Aug 3 2007 05:43:07:513PM	1070803031	Jin-Seok Ko	Shot 31 went good. Ibeam 6.3->4.4A
Aug 3 2007 05:51:01:537PM	1070803032	Steve Scott	good dnb. one tiny fault. good pressure. this is the third and last shot of this sequence. we are done for the day.

Physics Operator Comments
Aug 3 2007 09:15:48:550AM	1070803001	Joseph Snipes	Shot 1: Began where Ian left off yesterday keeping what was already in the model, which is a 0.6 MA, 5.4 T, 4 x 10^19 m^-2 plasma with a ramp from negative to positive ZCUR between 0.7 and 0.9 s. Changed prepuff to 30 ms duration to account for the cryopump, which is on. Good shot.
Aug 3 2007 09:32:31:790AM	1070803002	Joseph Snipes	Shot 2: Increased prepuff by 2 ms to 32 ms duration. Disrupted at 0.84 s. OH1 breaker pulled out at the end of the shot. Short pause to investigate.
Aug 3 2007 09:55:58:927AM	1070803003	Joseph Snipes	Shot 3: Corrected a few jumps at segment switch between segment 1 and segment 4 at 0.1 s. Increased prepuff by 2 ms to 34 ms duration. Good shot.
Aug 3 2007 09:57:23:380AM	1070803004	Joseph Snipes	Shot 4: Increased prepuff by 3 ms to 37 ms duration. Increased TF and OH invert times from 2.3 s to 2.4 s. Decreased nl04 to 3 x 10^19 m^-2.
Aug 3 2007 10:22:23:847AM	1070803004	Joseph Snipes	Shot 4: Increased prepuff by 3 ms to 37 ms duration. Increased TF and OH invert times from 2.3 s to 2.4 s. Decreased nl04 to 3 x 10^19 m^-2. Good shot.
Aug 3 2007 10:48:02:533AM	1070803005	Joseph Snipes	Shot 5: Increased pre-programmed gas from PG1 in segment 1 from 18 ms to 40 ms to 40 V to avoid the early runaways. Moved ZCUR ramp earlier by 100 ms to ramp from 0.6 to 0.8 s. Problem with scopes that Tom is looking into. Disrupted at 0.68 s.
Aug 3 2007 11:01:33:063AM	1070803006	Joseph Snipes	Shot 6: Changed CLEARIN predictor time from 0.75 to 0.65 s. Disrupted at 0.62 s.
Aug 3 2007 11:05:50:053AM	1070803007	Joseph Snipes	Shot 7: Reduced RCUR by 2.5 mm throughout the shot to increase the outer gap by 0.5 cm. Good shot but the RF tripped early.
Aug 3 2007 11:27:12:953AM	1070803008	Joseph Snipes	Shot 8: Raised Ip to 0.7 MA. Good shot, but RF tripped again so the H-mode was short.
Aug 3 2007 11:39:12:170AM	1070803009	Joseph Snipes	Shot 9: Try again to keep the RF on. OH coax resistance just exceeds 2.5 uOhm. Good shot but the RF trips again.
Aug 3 2007 12:00:27:693PM	1070803010	Joseph Snipes	Shot 10: Try again. Disrupted at 0.62 s. OH2 breaker pulled after the disruption. Delay to check fuses.
Aug 3 2007 12:24:17:987PM	1070803011	Joseph Snipes	Shot 11: Returned ZCUR ramp to start at 0.7 s and end at 0.9 s. Returned CLEARIN predictor time from 0.65 s to 0.75 s. Good shot. RF stayed up pretty well. OH resistance above 3 uOhms, but Irby says to keep going.
Aug 3 2007 12:28:20:633PM	1070803012	Joseph Snipes	Shot 12: Reduced nl04 to 2 x 10^19 m^-2. Disrupted at 0.27 s.
Aug 3 2007 12:47:29:140PM	1070803013	Joseph Snipes	Shot 13: Reloaded segment 4 from shot 11. Then, reduced nl04 after 0.35 s down to 2 x 10^19 m^-2. Increased PG1 gas in segment 1 from 0.017 s to 0.04 s. Good shot. Cryopump warmed up before the shot so it is surprising that there were no problems with the breakdown.
Aug 3 2007 01:06:42:193PM	1070803014	Joseph Snipes	Shot 14: Reduced Ip to 0.5 MA. Good shot. L-mode.
Aug 3 2007 01:24:14:993PM	1070803015	Joseph Snipes	Shot 15: Reduced RCUR by 2.5 mm to increase the outer gap by 5 mm. Turned off dpcs_ftae2. The Active MHD antennas have been off in any case. Good shot. Disrupted just after a pair of Li pellets at 1.7 s.
Aug 3 2007 01:39:58:747PM	1070803016	Joseph Snipes	Shot 16: Stagger the RF to see if D or E are more responsible for the increased Moly levels. Increase J to give a total of 2 MW throughout. Li pellet injected at 1.71 s. Good shot. Moly radiation appears to come from all three antennas and depends on the total RF power level.
Aug 3 2007 01:55:03:170PM	1070803017	Joseph Snipes	Shot 17: Ramped nl04 from 3 to 3.5 x 10^20 m^-2 from 0.3 to 0.4 s then constant until 0.6 s. Good shot. Fewer runaways. Some H-modes.
Aug 3 2007 02:08:34:607PM	1070803018	Joseph Snipes	Shot 18: Repeat to tune RF. Good shot. Several H-modes.
Aug 3 2007 02:23:52:983PM	1070803019	Joseph Snipes	Shot 19: Increased pre-programmed gas in segment 1 just before 0.1 s to try to eliminate the runaways. Increased nl04 to 6 x 10^19 m^-2. Good shot. Nice long H-mode.
Aug 3 2007 02:52:07:407PM	1070803020	Joseph Snipes	Shot 20: Reduced early pre-programmed gas before 0.1 s. Raised nl04 to 8 x 10^19 m^-2. Good shot. RF tripped at 0.96 s.
Aug 3 2007 03:07:19:707PM	1070803021	Joseph Snipes	Shot 21: Reduced nl04 to 7 x 10^19 m^-2. Raised early gas in segment 1 a little to reduce the early runaways. Good shot. RF tripped but there were a couple of H-modes.
Aug 3 2007 06:02:29:330PM	1070803022	Joseph Snipes	Shot 22: Repeat to tune the RF. Fizzle!
Aug 3 2007 03:28:06:933PM	1070803023	Joseph Snipes	Shot 23: Repeat to tune the RF. Good shot with a couple of H-modes.
Aug 3 2007 03:43:08:840PM	1070803024	Joseph Snipes	Shot 24: Increased Ip to 0.6 MA. Good shot with several H-modes.
Aug 3 2007 03:57:34:107PM	1070803025	Joseph Snipes	Shot 25: Repeat. Good shot with several H-modes.
Aug 3 2007 04:28:08:627PM	1070803026	Joseph Snipes	Shot 26: Raised Ip to 0.7 MA. Good shot with a number of short H-modes. Nice two-phase L-H transition around 0.95 s with a rise in edge Te and drop in fluctuations occurring about 2 ms before the drop in D-alpha and rise in density.
Aug 3 2007 04:34:58:193PM	1070803027	Joseph Snipes	Shot 27: Repeat. Good shot with many brief H-modes.
Aug 3 2007 04:40:56:990PM	1070803028	Joseph Snipes	Shot 28: Raised nl04 to 9 x 10^19 m^-2.
Aug 3 2007 04:47:30:057PM	1070803028	Joseph Snipes	Shot 28: Raised nl04 to 9 x 10^19 m^-2. Good shot with many H-modes.
Aug 3 2007 05:01:26:747PM	1070803029	Joseph Snipes	Shot 29: Repeat with max RF power. Good shot with a few H-modes with up to 4 MW of RF power.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:14:00:300AM	Plasma	Ok
2	09:27:35:223AM	Plasma	Bad	OH1 selfpowered inbypass
3	09:48:10:557AM	Plasma	Ok
4	10:08:06:110AM	Plasma	Ok
5	10:35:05:813AM	Test	Bad
6	10:48:53:817AM	Plasma	Ok
7	11:03:15:240AM	Plasma	Ok
8	11:17:02:613AM	Plasma	Ok
9	11:33:33:397AM	Plasma	Ok
10	11:49:48:680AM	Plasma	Ok	disruption caused OH1 SPC to to fire
11	12:08:48:907PM	Plasma	Ok
12	12:25:53:130PM	Plasma	Ok
13	12:42:03:320PM	Plasma	Ok
14	01:00:18:123PM	Plasma	Ok
15	01:14:20:810PM	Plasma	Ok
16	01:31:22:643PM	Plasma	Ok
17	01:49:59:727PM	Plasma	Ok
18	02:06:10:713PM	Plasma	Ok
19	02:20:48:527PM	Plasma	Ok
20	02:37:21:420PM	Plasma	Ok
21	02:56:51:570PM	Test	Ok
22	03:11:34:900PM	Plasma	Ok
23	03:24:52:633PM	Plasma	Ok
24	03:37:00:473PM	Plasma	Ok
25	03:55:21:137PM	Plasma	Ok
26	04:14:34:487PM	Plasma	Ok
27	04:27:37:003PM	Plasma	Ok
28	04:41:58:037PM	Plasma	Ok
29	04:57:32:333PM	Plasma	Ok
30	05:29:14:730PM	Test	Ok	MSE calibration
31	05:38:17:617PM	Test	Ok	MSE Calibration
32	05:47:33:737PM	Test	Ok