Alcator C-Mod Run 1071206 Information

Miniproposals

Miniproposal: 475

Date Filed: 3/23/2007

Title: Cryopump Startup

First Author: Brian Labombard

Session Leader: Brian Labombard (shots 1-29)

Operators
Session leader(s):	Brian Labombard
Physics operator(s):	Joseph Snipes
Engineering operator(s):	Bill Cochran,Andy Pfeiffer,Ed Fitzgerald

Engineering Operator Run Comment
MP#475: Cryopump Startup - H/D control experiments

Session Leader Plans

Entered: Dec 5 2007 02:51:50:980PM

Author: Brian Labombard

Run Plan for 1071206

MP#475 ""Cryopump Startup"" - H/D control experiments

Goal
Explore cryopump as a tool to control the H/(H+D) concentration in C-Mod discharges.
See if a strong 'puff and pump' scenario can be used to speed-up hydrogen from the vessel.

Plan
We will run some upper null discharges with NL04 ~ 0.9 both with cryopump
warm and cold. With cryopump cold, we will need a gas-fueling assist from
the NINJA system.

Start from USN discharge like 1071204027 (0.8 MA) with NL04 = 0.9.
Set up for 25 PSI D2 in NINJA system with trig: 0.3 duration: 1.0.
Gatevalves closed for 5 minutes after shot.

Run a few shots with and without cryopump. Monitor H/(H+D), look at RGA with
gatevalves closed. Move towards higher currents (1 MA) and densities (Nl04 ~ 1)
and repeat.

Physics Operators Plans

Entered: Dec 5 2007 04:59:21:537PM

Author: Joseph Snipes

Engineering setup for Thursday 06 Dec 2007

MP#475: Cryopump Startup - H/D control experiments

Session leader: B. LaBombard
Physics operator: J. Snipes

ECDC overnight in D2 and bake at 60 C. Stop ECDC by 7:00 am.

Run will start at 09:00 and end at 17:00.

Power systems as on 1071204027

A-coil configuration: +Dtop -Dbot -Jtop +Jbot; Enabled (standard
configuration)

Gas Setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3)
fill NINJA with 25 psi D2 Enabled

Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo (Do not enable DNB gate valve.)

Torvac setup: gate valves closed after the shot

Specific diagnostics: standard set

-------------------------------------------------------------------------------
ICRF Setup: Turned off for entire run

LH Setup: no

DNB: no

Cryopump: should be ready on the first shot but not pumping
-------------------------------------------------------------------------------
Run plan: start from 1071204027 (0.8 MA, 5.4 T, 0.9e20m-2, upper null) and compare H/D ratio with cryopump off and on. May run 1 MA later in the run at higher density. See session leader run plan for more details.

Session Leader Summaries

Entered: Dec 6 2007 10:23:22:497PM

Author: Brian Labombard

Run Summary for 1071206

MP#475 """"Cryopump Startup"""" - H/D control experiments

The primary goal of the experiments today was to see if we could exert some
control over the H/(H+D) concentrations in a discharge by a combination of
strong gas-puffing and cryopumping. In addition, we wanted to determine if such
'puff and pump' scenarios might help speed up the removal of hydrogen from the
vessel. The approach was simple: run USN discharges with pump on/off, look at
H/(H+D) behavior during the discharge and look at the quantity of hydrogen
recovered in the gas phase after the shot when the gate-valves are closed and
the cryopump has completed its regeneration (if it was used).

We started off by dialing up some USN plasmas to condition the upper divertor
surfaces, 0.8 MA at first then moving to 1.0 MA. It did not take long to get
reproducible USN discharges; by shot #5, good discharges were rolling off the
assembly line regularly. However, the cryopump system developed a problem early
- an ice blockage developed in the helium inlet line in preparation for
shot#2. Neither liquid nor gaseous helium could be sent through the line. We
began heating up the cryogenic lines (LHe and LN2) with room temperature gas
purges in the hope of thawing things out. Around about shot#10 the blockage in
the LHe line started to clear. We managed to get the pump operational for
shot#14. Then another problem became apparent - an intermittent reporting of the
H/(H+D) level due to low signal-to-noise levels. Apparently, Earls spectrometer
does not have a good view of the recycling light in the upper divertor. To
remedy this, we went to 0.8 MA discharges with NL04 ~ 1. These tended to have
bright inner divertor leg D-alpha intensities, resulting in a MARFE that jumped
to near the lower divertor in unpumped discharges. By shot #18, these conditions
led to good H/(H+D) signals in quasi-matched discharges with the pump on and
off. Then we ran many shots alternating between pump on and off, seeing if an
initially observed trend of low H/(H+D) with cryopumping persisted over many
shots. It did. Generally we found that the D2 puffing and pumping (about 130
torr-l injected and recovered) resulted in about a factor of two reduction in
H/(H+D) compared to the unpumped case (with about 30 torr-l injected and
recovered). H/(H+D) levels as low as 4% were observed with puff/pump, which is
remarkable considering that this is just the second run week in the present
campaign. A question that remains is: Did the puff/pump scenario result in
increased hydrogen removal from the vessel? For this we need to look at the RGA
traces of the recovered gas - something to chew on with Jim Irby's help when he
returns.

-- Shot Log --

Shot 14 - 1.0 MA, USN, NL04=0.83
Cryopump cold. 44 torr-l injected. 45 torr-l during regen
no H/(H+D) data, except around 2 seconds.
Shot 15 - 0.8 MA, USN, lost NL04 and feedback, gas valve wide open!
Cryopump cold. 168 torr-l injected. 167 torr-l revcovered during regen
H/(H+D) down to 6%
Shot 16 - Fizzle
Shot 17 - 0.8 MA, USN, NL04~0.77
Cryopump cold. 81 torr-l injected. 72.5 torr-l recovered during regen
H/(H+D) around 8%
Shot 18 - 0.8 MA, USN, NL04~0.95
Cryopump cold. 150 torr-l/s throughput.
139 torr-l injected. 124 torr-l revcovered during regen
H/(H+D) around 5%
Shot 19 - 0.8 MA, USN, NL04~1 and jumps up at .87 s as MARFE moves to bottom.
Cryopump warm. 29 torr-l injected, 28 torr-l recovered.
H/(H+D) around 8.5% before MARFE, then ramps to 12%
Shot 20 - Fizzle
Shot 21 - 0.8 MA, USN, NL04~0.95 and jumps up at 1 s as inner strikepoint MARFE moves to bottom.
Cryopump warm. 28 torr-l injected, 26 torr-l recovered.
H/(H+D) around 11% before MARFE, then ramps to 13%
Shot 22 - 0.8 MA, USN, NL04~0.93
Cryopump cold. 143 torr-l injected, 124 torr-l recovered.
H/(H+D) around 4.5%
Shot 23 - 0.8 MA, USN, NL04~0.94 and jumps up at 1.1 s as inner strikepoint MARFE moves to bottom.
Cryopump warm. 26.5 torr-l injected, 22.5 torr-l recovered.
H/(H+D) around 10%
Shot 24 - 0.8 MA, USN, NL04~0.93
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump cold. 140 torr-l injected, 122 torr-l recovered.
H/(H+D) around 4.5%
Shot 25 - 0.8 MA, USN, NL04~0.96, jumps up at 1.1s as MARFE forms on bottom.
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump warm. 34 torr-l injected, 29.6 torr-l recovered.
H/(H+D) around 9%
Shot 26 - 0.8 MA, USN, NL04~0.96, jumps up at 1.1s as MARFE changes
piezo valve goes wide open 1.27 to 1.38 s for some reason.
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump warm. 45 torr-l injected, 37 torr-l recovered.
H/(H+D) around 8% ramping to 10%
Shot 27 - Fizzle
Shot 28 - 0.8 MA, USN, NL04~0.94
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump cold. 139 torr-l injected, 120 torr-l recovered.
H/(H+D) ramps down to around 4% at 1 s and holds at 4% until 1.5 s
Shot 29 - 0.8 MA, USN, NL04~0.92
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump cold. 138 torr-l injected, 122 torr-l recovered.
Again, H/(H+D) ramps down to around 5% at 0.7 s, then 4% at 1 s and holds at 4% until 1.45 s

Physics Operator Summaries

Entered: Dec 6 2007 05:08:58:820PM

Author: Joseph Snipes

Despite some initial difficulties getting the cryopump working properly in the morning, we completed the scientific program of the run and got very good results. See the Session Leaders summary for details. The machine ran very well today with no delays due to main machine components or power systems, though there were data system delays on the first and last shots. There were a total of 29 shots with 25 plasmas and 4 fizzles. All plasmas were full length upper null except for disruptions in the rampdown for the shots without the cryopump. The cryopump was very effective at pumping out the density in the rampdown resulting in very smooth rampdowns and no disruptions in rampdown for shots with the cryopump on. We settled on 0.8 MA and about 0.9 x 10^20 m-2 so as to get MARFES to improve the signal on the H/D ratio measurement, which was essential for the scientific results of this experiment. In general, the H/D ratio was twice as large without the cryopump as with the cryopump on because the extra deuterium puffing required to achieve the same density with the cryopump on dilutes the hydrogen more.

Shot,Duration(s),Ipmax(MA),Result Shot,Duration(s),Ipmax,Result
| 01 1.743 0.809 Plasma | 02 1.691 0.816 Plasma |
| 03 1.696 0.819 Plasma | 04 0.000 0.038 Fizzle |
| 05 1.701 1.006 Plasma | 06 1.804 1.008 Plasma |
| 07 1.835 1.007 Plasma | 08 1.870 1.008 Plasma |
| 09 1.832 1.008 Plasma | 10 1.845 1.009 Plasma |
| 11 1.876 1.008 Plasma | 12 1.906 1.009 Plasma |
| 13 1.955 1.010 Plasma | 14 1.966 1.010 Plasma |
| 15 1.571 0.809 Plasma | 16 0.000 0.052 Fizzle |
| 17 1.967 0.826 Plasma | 18 1.964 0.817 Plasma |
| 19 1.791 0.817 Plasma | 20 0.000 0.054 Fizzle |
| 21 1.771 0.817 Plasma | 22 1.964 0.817 Plasma |
| 23 1.778 0.816 Plasma | 24 1.965 0.819 Plasma |
| 25 1.734 0.814 Plasma | 26 1.711 0.815 Plasma |
| 27 0.000 0.050 Fizzle | 28 1.966 0.823 Plasma |
| 29 1.965 0.817 Plasma
Date 1071206: 29 shots. 25 plasmas. 4 fizzles. 0 duds. 0 System Error.
Total plasma duration: 45.87 s (exceeding -81 kA)

Session Leader Comments

Dec 6 2007 09:54:29:987AM 1071206001 Brian Labombard Shot 1 - 0.8 MA, USN, NL04~1 and dropping
Cryopump off.
18 torr-liters in, 18 torr-liters out
H/(H+D) rising from .06 to 0.12

Dec 6 2007 12:29:11:167PM 1071206009 Brian Labombard Shot 9 - 1.0 MA, USN, NL04=0.86 ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump off.
Probes cleaning up

Dec 6 2007 01:08:26:963PM 1071206012 Brian Labombard Shot 12 - 1.0 MA, USN, NL04=0.86 ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump off. Ice block seems to be cleared.
We will open the LN2 valve and start flow again.
Probes cleaning up.

Dec 6 2007 01:39:18:197PM 1071206013 Brian Labombard Shot 13 - 1.0 MA, USN, NL04=0.83 ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump off.
Probes cleaning up.
No H/(H+D) data!

Dec 6 2007 01:54:31:420PM 1071206014 Brian Labombard Shot 14 - 1.0 MA, USN, NL04=0.83 ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump cold. 44 torr-l injected. 45 torr-l during regen
no H/(H+D) data, except around 2 seconds.

Next: go to 0.8 MA, NL04 = 0.8

Dec 6 2007 02:06:43:533PM 1071206015 Brian Labombard Shot 15 - 0.8 MA, USN, lost NL04 and feedback, gas valve wide open.
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump cold. 168 torr-l injected. 167 torr-l revcovered during regen
H/(H+D) down to 6%

Next: NL04 = 0.9 with feedback control

Dec 6 2007 02:21:16:587PM 1071206016 Brian Labombard Fizzle. 1.3 torr-liters in, 3 torr-liters out

Dec 6 2007 02:32:08:153PM 1071206017 Brian Labombard Shot 17 - 0.8 MA, USN, NL04~0.77
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump cold. 81 torr-l injected. 72.5 torr-l revcovered during regen
H/(H+D) around 8%

Next: NL04 = 1.2 with feedback control

Dec 6 2007 02:44:46:720PM 1071206018 Brian Labombard Shot 18 - 0.8 MA, USN, NL04~0.95
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump cold. 150 torr-l/s throughput.
139 torr-l injected. 124 torr-l revcovered during regen
H/(H+D) around 5%

Next: try for same NL04 with pump warm.

Dec 6 2007 02:57:10:287PM 1071206019 Brian Labombard Shot 19 - 0.8 MA, USN, NL04~1 and jumps up at .87 s as MARFE moves to bottom.
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump warm. 29 torr-l injected, 28 torr-l recovered.
H/(H+D) around 8.5% before MARFE, then ramps to 12%

Next: try for slightly lower NL04 with pump warm.

Dec 6 2007 03:21:00:937PM 1071206021 Brian Labombard Shot 21 - 0.8 MA, USN, NL04~0.95 and jumps up at 1 s as inner strikepoint MARFE moves to bottom.
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump warm. 28 torr-l injected, 26 torr-l recovered.
H/(H+D) around 11% before MARFE, then ramps to 13%

Next: Repeat shot #18 with cryopump cold

Dec 6 2007 03:39:29:850PM 1071206022 Brian Labombard Shot 22 - 0.8 MA, USN, NL04~0.93
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump cold. 143 torr-l injected, 124 torr-l recovered.
H/(H+D) around 4.5%

Next: Repeat shot #21 with cryopump warm

Dec 6 2007 03:49:25:027PM 1071206023 Brian Labombard Shot 23 - 0.8 MA, USN, NL04~0.94 and jumps up at 1.1 s as inner strikepoint MARFE moves to bottom.
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump warm. 26.5 torr-l injected, 22.5 torr-l recovered.
H/(H+D) around 10%

Next: Repeat shot #18 with cryopump cold

Dec 6 2007 04:01:37:717PM 1071206024 Brian Labombard Shot 24 - 0.8 MA, USN, NL04~0.93
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump cold. 140 torr-l injected, 122 torr-l recovered.
H/(H+D) around 4.5%

Next: Repeat shot #21 with cryopump warm and bring scanning probes to separatrix.

Dec 6 2007 04:13:04:957PM 1071206025 Brian Labombard Shot 25 - 0.8 MA, USN, NL04~0.96, jumps up at 1.1s as MARFE forms on bottom.
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump warm. 34 torr-l injected, 29.6 torr-l recovered.
H/(H+D) around 9%

Next: Repeat with probes deeper, again crypump off.

Dec 6 2007 04:30:03:277PM 1071206026 Brian Labombard Shot 26 - 0.8 MA, USN, NL04~0.96, jumps up at 1.1s as MARFE changes
piezo valve goes wide open 1.27 to 1.38 s for some reason.
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump warm. 45 torr-l injected, 37 torr-l recovered.
H/(H+D) around 8% ramping to 10%

Next: Repeat shot #18 with cryopump cold.

Dec 6 2007 04:55:47:630PM 1071206028 Brian Labombard Shot 28 - 0.8 MA, USN, NL04~0.94
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump cold. 139 torr-l injected, 120 torr-l recovered.
H/(H+D) ramps down to around 4% at 1 s and holds at 4% until 1.5 s

Next: Repeat

Dec 6 2007 05:25:18:203PM 1071206029 Brian Labombard Shot 29 - 0.8 MA, USN, NL04~0.92
ASP/FSP scanning at 0.7, 0.9, 1.1 s
Cryopump cold. 138 torr-l injected, 122 torr-l recovered.
Again, H/(H+D) ramps down to around 5% at 0.7 s, then 4% at 1 s and holds at 4% until 1.45 s

Physics Operator Comments

Dec 6 2007 09:42:41:260AM 1071206001 Joseph Snipes Shot 1: Reloaded shot 1071205026 for the startup then loaded segment 3 from shot 1071204027 into segment 3 and turned off segment 2 and on segment 3. This is an upper null 0.8 MA, 5.4 T shot with nl04 set to 0.8 x 10^20 m^-2. It seems that the cryopump is always pumping, which may make today's experiment rather difficult. However, I increased the prepuff by 10 ms to 25 ms duration to account for the extra pumping. I also set the argon puff to 100 ms duration and enabled the valve. Good shot.

Dec 6 2007 10:26:25:650AM 1071206001 Joseph Snipes Problem with the cryopump. Short delay.

Dec 6 2007 10:50:34:443AM 1071206002 Joseph Snipes Shot 2: Repeat. Cryopump off attempting to warm up an ice block in the line. Good shot.

Dec 6 2007 11:01:01:010AM 1071206003 Joseph Snipes Shot 2: Reduce prepuff to 20 ms duration. Good shot.

Dec 6 2007 11:14:52:123AM 1071206004 Joseph Snipes Shot 4: Increased Ip to 1 MA. Reduced prepuff to 17 ms duration. Chamber pressure was very high at breakdown around 8 x 10^-6 Torr, much higher than the previous shots. Fizzle.

Dec 6 2007 11:28:19:490AM 1071206005 Joseph Snipes Shot 5: Try again with no changes to see if the problem repeats itself or goes away. Good shot.

Dec 6 2007 11:41:17:133AM 1071206006 Joseph Snipes Shot 6: Set pre-programmed gas puff in segment 3 to zero after 0.144 s to attempt to get rid of the MARFE. Good shot.

Dec 6 2007 11:53:57:857AM 1071206007 Joseph Snipes Shot 7: Repeat. Good shot.

Dec 6 2007 12:06:57:503PM 1071206008 Joseph Snipes Shot 8: Repeat. Good shot.

Dec 6 2007 12:19:49:163PM 1071206009 Joseph Snipes Shot 9: Repeat. Good shot.

Dec 6 2007 12:32:20:777PM 1071206010 Joseph Snipes Shot 10: Repeat. Good shot.

Dec 6 2007 12:48:14:160PM 1071206011 Joseph Snipes Shot 11: Changed rampdown to attempt to ramp the plasma all the way down. Pushed RCUR a little faster in rampdown against the inner wall. Dropped nl04 negative after 1.5 s. Good shot.

Dec 6 2007 01:02:01:807PM 1071206012 Joseph Snipes Shot 12: Repeat. Good shot.

Dec 6 2007 01:03:50:963PM 1071206012 Joseph Snipes Cell access for cryopump maintenance.

Dec 6 2007 01:25:58:143PM 1071206013 Joseph Snipes Shot 13: Repeat while cryopump begins to cool down. Good shot.

Dec 6 2007 01:43:35:603PM 1071206014 Joseph Snipes Shot 14: Increased prepuff by 10 ms to 27 ms duration to account for the cryopump.
Good shot.

Dec 6 2007 01:58:51:843PM 1071206015 Joseph Snipes Shot 15: Increased prepuff by 5 ms to 32 ms duration. Reduced Ip to 0.8 MA. Gas fault resulted in gas puffing full out during the shot. TCI seems dead. Disrupted at 1.56 s.

Dec 6 2007 02:08:01:127PM 1071206016 Joseph Snipes Shot 16: Repeat with the TCI gate valve open. Also increased nl04 to 9 x 10^19 m^-2. Fizzle! Neutral pressure at 3.5 x 10^-7 just before the shot.

Dec 6 2007 02:19:59:977PM 1071206017 Joseph Snipes Shot 17: Increased prepuff by 5 ms to 37 ms duration. Good shot.

Dec 6 2007 02:32:43:073PM 1071206018 Joseph Snipes Shot 18: Increased prepuff by 3 ms to 40 ms duration. Increased nl04 to 1.2 x 10^20 m^-2. Good shot.

Dec 6 2007 02:46:44:487PM 1071206019 Joseph Snipes Shot 19: Decreased prepuff by to 17 ms duration. Decreased nl04 to 1.0 x 10^20 m^-2. Cryopump warm. Good shot.

Dec 6 2007 02:58:26:223PM 1071206020 Joseph Snipes Shot 20: Reduced nl04 to 0.95 x 10^20 m^-2. Fizzle!

Dec 6 2007 03:11:01:557PM 1071206021 Joseph Snipes Shot 21: Reduced prepuff by 2 ms to 15 ms duration. Good shot.

Dec 6 2007 03:25:15:360PM 1071206022 Joseph Snipes Shot 22: Reloaded shot 18. Cryopump back on. Good shot.

Dec 6 2007 03:36:46:130PM 1071206023 Joseph Snipes Shot 23: Reloaded shot 21. Cryopump off. Good shot.

Dec 6 2007 03:50:19:997PM 1071206024 Joseph Snipes Shot 24: Reloaded shot 18. Cryopump back on. Good shot.

Dec 6 2007 04:03:44:797PM 1071206025 Joseph Snipes Shot 25: Reloaded shot 21. Cryopump off. Good shot.

Dec 6 2007 04:18:48:240PM 1071206026 Joseph Snipes Shot 26: Repeat. Good shot.

Dec 6 2007 04:33:08:527PM 1071206027 Joseph Snipes Shot 27: Reloaded shot 18. Cryopump back on. Fizzle!

Dec 6 2007 04:45:27:233PM 1071206028 Joseph Snipes Shot 28: Repeat. Good shot.

Dec 6 2007 05:08:49:210PM 1071206029 Joseph Snipes Shot 29: Repeat. Good shot.

Engineering Operator Comments

Shot Time Type Status Comment

1 09:40:02:433AM Plasma Ok

2 10:46:10:363AM Plasma Ok

3 10:59:18:803AM Plasma Ok

4 11:12:08:590AM Plasma Ok

5 11:26:27:253AM Plasma Ok

6 11:39:35:163AM Plasma Ok

7 11:52:20:123AM Plasma Ok

8 12:05:21:567PM Plasma Ok

9 12:17:54:943PM Plasma Ok

10 12:30:30:730PM Plasma Ok

11 12:43:14:500PM Plasma Ok

12 12:55:58:363PM Plasma Ok

13 01:24:22:517PM Plasma Ok

14 01:40:13:070PM Plasma Ok

15 01:53:13:653PM Plasma Ok

16 02:05:53:627PM Plasma Ok

17 02:18:15:680PM Plasma Ok

18 02:30:58:933PM Plasma Ok

19 02:44:02:280PM Plasma Ok

20 02:56:45:990PM Plasma Ok

21 03:09:08:697PM Plasma Ok

22 03:21:48:513PM Plasma Ok

23 03:35:05:363PM Plasma Ok

24 03:48:32:777PM Plasma Ok

25 04:01:08:250PM Plasma Ok

26 04:16:58:567PM Plasma Ok

27 04:31:31:323PM Plasma Ok

28 04:43:43:060PM Plasma Ok

29 04:56:12:630PM Plasma Ok

System Availability

Dec 6 2007 09:39:45:997AM

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 no Diode 2pi working fine, foil 2pi still in the same poor condition as last campaign. Midplane AXUV down, fixing problem with AXA. Midplane foils working fine, but need calibration. 2D bolometry is being digitized but need to debug and calibrate gains. Nov 29 2007 01:38PM (mlreinke) Matt Reinke Bolometers hutch,mlreinke
Boronization no First Boronization 5/9/07 Bottle has been removed from the cell Sep 14 2007 12:42PM (dekow) Jim Irby Boronization dekow,irby
CNPA no Jan 14 2007 02:06PM Ron Parker Compact Neutral Analyzer parker
Cryopump - Upper Divertor no LN2 manual valve is closed. LHe valve is closed and disconnected from PLC. Sep 14 2007 01:26PM (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=[74.2:86.3]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. Nov 27 2007 10:21AM (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 Nov 26 2007 04:23PM (terry) Jim Terry Balmer Alpha Monitor irby,terry,wolfe
Dalsa yes optics repaired, camera re-installed, and view has been re-calibrated Nov 27 2007 09:54AM (marmar) Earl Marmar Visible Bremsstrahlung marmar
Disruption Mitigation no Nov 20 2007 10:47PM (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 Nov 20 2007 10:47PM (granetz) Robert Granetz Diagnostic Neutral Beam beals,granetz
FRC-ECE yes Chs 17-32 working - low freq. mixer being repaired Nov 26 2007 11:41AM (phillips) Perry Phillips Heterodyne ECE-32 channels phillips
G-Side Ratiomatic yes Gauge is operational and calibrated against G-side MKS on shot#1071127002 Nov 27 2007 01:25PM (labombard) Brian LaBombard G-side ratiomatic ionization gauge labombard,toland
GPC yes Detectors cooled 12/4. Signals on all but Chs 9. Recalibrated 12/4. Dec 05 2007 09:29AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPC2 yes Detectors cooled 12/5. Most channels operational. Dec 05 2007 09:30AM (hubbard) Amanda Hubbard ECE Polychromater hubbard,schmidt
GPI no Neither the Xpt-view nor the midplane-view camera is operational. Nov 26 2007 04:25PM (terry) Jim Terry Gas Puff Imaging terry,zweben
H/D yes Should be operational for the FY08 campaign Nov 27 2007 09:54AM (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 no Be Window has a leak and so the gate valve is closed Nov 23 2007 12:50PM (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 no Coaxial line disconnected from the antenna Sep 14 2007 11:24AM (ylin) Steve Wukitch D-port antenna wukitch,ylin
ICRF E-Antenna no coaxial line disconnected from the antenna Sep 14 2007 11:24AM (ylin) Steve Wukitch E-port antenna wukitch,ylin
ICRF J-Antenna no Antenna is still connected. We will only do transmitter work after the lines are disconnected and capped. Sep 14 2007 11:26AM (ylin) Steve Wukitch J-port antenna wukitch,ylin
Lower Hybrid yes Body I Fault Circuits Repaired and tested. High power tests completed Dec 05 2007 06:40PM (dterry) Ron Parker Lower Hybrid dterry,parker
LPI no Oct 12 2007 12:41PM (bose) Earl Marmar Lithium Pellet Injector bose,marmar
Ly-alpha no Midplane and WB1-LY attached but need to be debugged Nov 20 2007 05:21PM (mlreinke) Matt Reinke Lyman alpha cameras labombard,mlreinke
McPherson yes Working fine. Nov 29 2007 01:36PM (mlreinke) Jim Terry VUV Spectrometer mlreinke,terry
Michelson yes Working, low speed to start out. Dec 04 2007 09:27AM (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 We are basically awaiting the DNB & its new aperture. MSE itself is OK. Two of 10 channels are dead. Nov 20 2007 08:26PM (sscott) Steve Scott Motional Stark Effect jinseok,sscott
Neutrons yes Voltage is on for the He3 bank. Voltage will be turned on for the global system at the first plasma attempts. Nov 26 2007 08:31AM (fiore) Catherine Fiore Neutron Detectors fiore
Neuts and Hards yes calibration unchanged from 2007 campaign Dec 04 2007 08:56PM (irby) Jim Irby X-Ray/Neutron Detector at K-Hor irby
NINJA yes All capillaries displayed by the NINJA_CONTROL GUI have been tested. Nov 26 2007 04:26PM (terry) Brian LaBombard NINJA gas puff labombard,terry
PCI no Both CO2 and HeNe Lasers are disabled----- safe for machine entry. Sep 14 2007 03:21PM (lianglin) Miklos Porkolab Phase Contrast Imaging edlund,lianglin,ntsujii,porkolab
Penning Gauges yes All gauges except B_DivL are operating Nov 27 2007 01:31PM (labombard) Brian LaBombard Penning Ionization Gauges labombard
Plasma TV yes WIDE1, WIDE2 (chan 33), DANT, JANT and DIV are operational. Nov 26 2007 04:27PM (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
Probe Array - ISD yes Operational Nov 27 2007 01:40PM (labombard) Brian Labombard Inner Lower Divertor Probe Array labombard
Probe Array - LH yes Operational Nov 27 2007 01:40PM (labombard) Brian LaBombard Lower Hybrid Probe Array labombard
Probe Array - OSD yes Operational Nov 27 2007 01:41PM (labombard) Brian LaBombard Outer Lower Divertor Probe Array labombard
Probe Array - UDIV yes Operational Nov 27 2007 01:41PM (labombard) Brian LaBombard Upper Divertor Probe Array labombard
Reflectometer no System off Sep 14 2007 02:46PM (dominguez) Earl Marmar Reflectometer dominguez,marmar
Scanning Probe - ASP yes Operational, but needs to be checked with plasma. Nov 27 2007 01:45PM (labombard) Brian LaBombard A-Port Scanning Probe labombard
Scanning Probe - FSP no Pneumatic air supply is still disconnected. Nov 27 2007 01:46PM (labombard) Brian LaBombard F-Port Scanning Probe labombard
Scanning Probe - WASP yes A- and K-port WASP electrodes have been replaced/tested. Nov 27 2007 01:44PM (labombard) Brian LaBombard Inner Wall Scanning Probe labombard,nsmick
TCI yes CO2 Laser is on --- initial alignment complete Nov 16 2007 01:23PM (irby) Jim Irby Two-Color Interferometer irby,murray
TS - Core no System is being reassembled following manned access. Availablity during pre-physics phase will be limited. Nov 26 2007 02:58PM (jwhughes) Jerry Hughes Core Thomson scattering jwhughes,yma
TS - Edge no System being reassembled following manned access. Availability will be limited during pre-physics portion of campaign. Nov 26 2007 02:59PM (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
XTOMO no Data acquisition upgraded before FY08. Still waiting on engineering network connection to run digitizers. Nov 27 2007 09:16AM (mlreinke) Bob Granetz X-Ray Tomography granetz,mlreinke

Session Leader Comments
Dec 6 2007 09:54:29:987AM	1071206001	Brian Labombard	Shot 1 - 0.8 MA, USN, NL04~1 and dropping Cryopump off. 18 torr-liters in, 18 torr-liters out H/(H+D) rising from .06 to 0.12
Dec 6 2007 12:29:11:167PM	1071206009	Brian Labombard	Shot 9 - 1.0 MA, USN, NL04=0.86 ASP/FSP scanning at 0.7, 0.9, 1.1 s Cryopump off. Probes cleaning up
Dec 6 2007 01:08:26:963PM	1071206012	Brian Labombard	Shot 12 - 1.0 MA, USN, NL04=0.86 ASP/FSP scanning at 0.7, 0.9, 1.1 s Cryopump off. Ice block seems to be cleared. We will open the LN2 valve and start flow again. Probes cleaning up.
Dec 6 2007 01:39:18:197PM	1071206013	Brian Labombard	Shot 13 - 1.0 MA, USN, NL04=0.83 ASP/FSP scanning at 0.7, 0.9, 1.1 s Cryopump off. Probes cleaning up. No H/(H+D) data!
Dec 6 2007 01:54:31:420PM	1071206014	Brian Labombard	Shot 14 - 1.0 MA, USN, NL04=0.83 ASP/FSP scanning at 0.7, 0.9, 1.1 s Cryopump cold. 44 torr-l injected. 45 torr-l during regen no H/(H+D) data, except around 2 seconds. Next: go to 0.8 MA, NL04 = 0.8
Dec 6 2007 02:06:43:533PM	1071206015	Brian Labombard	Shot 15 - 0.8 MA, USN, lost NL04 and feedback, gas valve wide open. ASP/FSP scanning at 0.7, 0.9, 1.1 s Cryopump cold. 168 torr-l injected. 167 torr-l revcovered during regen H/(H+D) down to 6% Next: NL04 = 0.9 with feedback control
Dec 6 2007 02:21:16:587PM	1071206016	Brian Labombard	Fizzle. 1.3 torr-liters in, 3 torr-liters out
Dec 6 2007 02:32:08:153PM	1071206017	Brian Labombard	Shot 17 - 0.8 MA, USN, NL04~0.77 ASP/FSP scanning at 0.7, 0.9, 1.1 s Cryopump cold. 81 torr-l injected. 72.5 torr-l revcovered during regen H/(H+D) around 8% Next: NL04 = 1.2 with feedback control
Dec 6 2007 02:44:46:720PM	1071206018	Brian Labombard	Shot 18 - 0.8 MA, USN, NL04~0.95 ASP/FSP scanning at 0.7, 0.9, 1.1 s Cryopump cold. 150 torr-l/s throughput. 139 torr-l injected. 124 torr-l revcovered during regen H/(H+D) around 5% Next: try for same NL04 with pump warm.
Dec 6 2007 02:57:10:287PM	1071206019	Brian Labombard	Shot 19 - 0.8 MA, USN, NL04~1 and jumps up at .87 s as MARFE moves to bottom. ASP/FSP scanning at 0.7, 0.9, 1.1 s Cryopump warm. 29 torr-l injected, 28 torr-l recovered. H/(H+D) around 8.5% before MARFE, then ramps to 12% Next: try for slightly lower NL04 with pump warm.
Dec 6 2007 03:21:00:937PM	1071206021	Brian Labombard	Shot 21 - 0.8 MA, USN, NL04~0.95 and jumps up at 1 s as inner strikepoint MARFE moves to bottom. ASP/FSP scanning at 0.7, 0.9, 1.1 s Cryopump warm. 28 torr-l injected, 26 torr-l recovered. H/(H+D) around 11% before MARFE, then ramps to 13% Next: Repeat shot #18 with cryopump cold
Dec 6 2007 03:39:29:850PM	1071206022	Brian Labombard	Shot 22 - 0.8 MA, USN, NL04~0.93 ASP/FSP scanning at 0.7, 0.9, 1.1 s Cryopump cold. 143 torr-l injected, 124 torr-l recovered. H/(H+D) around 4.5% Next: Repeat shot #21 with cryopump warm
Dec 6 2007 03:49:25:027PM	1071206023	Brian Labombard	Shot 23 - 0.8 MA, USN, NL04~0.94 and jumps up at 1.1 s as inner strikepoint MARFE moves to bottom. ASP/FSP scanning at 0.7, 0.9, 1.1 s Cryopump warm. 26.5 torr-l injected, 22.5 torr-l recovered. H/(H+D) around 10% Next: Repeat shot #18 with cryopump cold
Dec 6 2007 04:01:37:717PM	1071206024	Brian Labombard	Shot 24 - 0.8 MA, USN, NL04~0.93 ASP/FSP scanning at 0.7, 0.9, 1.1 s Cryopump cold. 140 torr-l injected, 122 torr-l recovered. H/(H+D) around 4.5% Next: Repeat shot #21 with cryopump warm and bring scanning probes to separatrix.
Dec 6 2007 04:13:04:957PM	1071206025	Brian Labombard	Shot 25 - 0.8 MA, USN, NL04~0.96, jumps up at 1.1s as MARFE forms on bottom. ASP/FSP scanning at 0.7, 0.9, 1.1 s Cryopump warm. 34 torr-l injected, 29.6 torr-l recovered. H/(H+D) around 9% Next: Repeat with probes deeper, again crypump off.
Dec 6 2007 04:30:03:277PM	1071206026	Brian Labombard	Shot 26 - 0.8 MA, USN, NL04~0.96, jumps up at 1.1s as MARFE changes piezo valve goes wide open 1.27 to 1.38 s for some reason. ASP/FSP scanning at 0.7, 0.9, 1.1 s Cryopump warm. 45 torr-l injected, 37 torr-l recovered. H/(H+D) around 8% ramping to 10% Next: Repeat shot #18 with cryopump cold.
Dec 6 2007 04:55:47:630PM	1071206028	Brian Labombard	Shot 28 - 0.8 MA, USN, NL04~0.94 ASP/FSP scanning at 0.7, 0.9, 1.1 s Cryopump cold. 139 torr-l injected, 120 torr-l recovered. H/(H+D) ramps down to around 4% at 1 s and holds at 4% until 1.5 s Next: Repeat
Dec 6 2007 05:25:18:203PM	1071206029	Brian Labombard	Shot 29 - 0.8 MA, USN, NL04~0.92 ASP/FSP scanning at 0.7, 0.9, 1.1 s Cryopump cold. 138 torr-l injected, 122 torr-l recovered. Again, H/(H+D) ramps down to around 5% at 0.7 s, then 4% at 1 s and holds at 4% until 1.45 s

Physics Operator Comments
Dec 6 2007 09:42:41:260AM	1071206001	Joseph Snipes	Shot 1: Reloaded shot 1071205026 for the startup then loaded segment 3 from shot 1071204027 into segment 3 and turned off segment 2 and on segment 3. This is an upper null 0.8 MA, 5.4 T shot with nl04 set to 0.8 x 10^20 m^-2. It seems that the cryopump is always pumping, which may make today's experiment rather difficult. However, I increased the prepuff by 10 ms to 25 ms duration to account for the extra pumping. I also set the argon puff to 100 ms duration and enabled the valve. Good shot.
Dec 6 2007 10:26:25:650AM	1071206001	Joseph Snipes	Problem with the cryopump. Short delay.
Dec 6 2007 10:50:34:443AM	1071206002	Joseph Snipes	Shot 2: Repeat. Cryopump off attempting to warm up an ice block in the line. Good shot.
Dec 6 2007 11:01:01:010AM	1071206003	Joseph Snipes	Shot 2: Reduce prepuff to 20 ms duration. Good shot.
Dec 6 2007 11:14:52:123AM	1071206004	Joseph Snipes	Shot 4: Increased Ip to 1 MA. Reduced prepuff to 17 ms duration. Chamber pressure was very high at breakdown around 8 x 10^-6 Torr, much higher than the previous shots. Fizzle.
Dec 6 2007 11:28:19:490AM	1071206005	Joseph Snipes	Shot 5: Try again with no changes to see if the problem repeats itself or goes away. Good shot.
Dec 6 2007 11:41:17:133AM	1071206006	Joseph Snipes	Shot 6: Set pre-programmed gas puff in segment 3 to zero after 0.144 s to attempt to get rid of the MARFE. Good shot.
Dec 6 2007 11:53:57:857AM	1071206007	Joseph Snipes	Shot 7: Repeat. Good shot.
Dec 6 2007 12:06:57:503PM	1071206008	Joseph Snipes	Shot 8: Repeat. Good shot.
Dec 6 2007 12:19:49:163PM	1071206009	Joseph Snipes	Shot 9: Repeat. Good shot.
Dec 6 2007 12:32:20:777PM	1071206010	Joseph Snipes	Shot 10: Repeat. Good shot.
Dec 6 2007 12:48:14:160PM	1071206011	Joseph Snipes	Shot 11: Changed rampdown to attempt to ramp the plasma all the way down. Pushed RCUR a little faster in rampdown against the inner wall. Dropped nl04 negative after 1.5 s. Good shot.
Dec 6 2007 01:02:01:807PM	1071206012	Joseph Snipes	Shot 12: Repeat. Good shot.
Dec 6 2007 01:03:50:963PM	1071206012	Joseph Snipes	Cell access for cryopump maintenance.
Dec 6 2007 01:25:58:143PM	1071206013	Joseph Snipes	Shot 13: Repeat while cryopump begins to cool down. Good shot.
Dec 6 2007 01:43:35:603PM	1071206014	Joseph Snipes	Shot 14: Increased prepuff by 10 ms to 27 ms duration to account for the cryopump. Good shot.
Dec 6 2007 01:58:51:843PM	1071206015	Joseph Snipes	Shot 15: Increased prepuff by 5 ms to 32 ms duration. Reduced Ip to 0.8 MA. Gas fault resulted in gas puffing full out during the shot. TCI seems dead. Disrupted at 1.56 s.
Dec 6 2007 02:08:01:127PM	1071206016	Joseph Snipes	Shot 16: Repeat with the TCI gate valve open. Also increased nl04 to 9 x 10^19 m^-2. Fizzle! Neutral pressure at 3.5 x 10^-7 just before the shot.
Dec 6 2007 02:19:59:977PM	1071206017	Joseph Snipes	Shot 17: Increased prepuff by 5 ms to 37 ms duration. Good shot.
Dec 6 2007 02:32:43:073PM	1071206018	Joseph Snipes	Shot 18: Increased prepuff by 3 ms to 40 ms duration. Increased nl04 to 1.2 x 10^20 m^-2. Good shot.
Dec 6 2007 02:46:44:487PM	1071206019	Joseph Snipes	Shot 19: Decreased prepuff by to 17 ms duration. Decreased nl04 to 1.0 x 10^20 m^-2. Cryopump warm. Good shot.
Dec 6 2007 02:58:26:223PM	1071206020	Joseph Snipes	Shot 20: Reduced nl04 to 0.95 x 10^20 m^-2. Fizzle!
Dec 6 2007 03:11:01:557PM	1071206021	Joseph Snipes	Shot 21: Reduced prepuff by 2 ms to 15 ms duration. Good shot.
Dec 6 2007 03:25:15:360PM	1071206022	Joseph Snipes	Shot 22: Reloaded shot 18. Cryopump back on. Good shot.
Dec 6 2007 03:36:46:130PM	1071206023	Joseph Snipes	Shot 23: Reloaded shot 21. Cryopump off. Good shot.
Dec 6 2007 03:50:19:997PM	1071206024	Joseph Snipes	Shot 24: Reloaded shot 18. Cryopump back on. Good shot.
Dec 6 2007 04:03:44:797PM	1071206025	Joseph Snipes	Shot 25: Reloaded shot 21. Cryopump off. Good shot.
Dec 6 2007 04:18:48:240PM	1071206026	Joseph Snipes	Shot 26: Repeat. Good shot.
Dec 6 2007 04:33:08:527PM	1071206027	Joseph Snipes	Shot 27: Reloaded shot 18. Cryopump back on. Fizzle!
Dec 6 2007 04:45:27:233PM	1071206028	Joseph Snipes	Shot 28: Repeat. Good shot.
Dec 6 2007 05:08:49:210PM	1071206029	Joseph Snipes	Shot 29: Repeat. Good shot.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:40:02:433AM	Plasma	Ok
2	10:46:10:363AM	Plasma	Ok
3	10:59:18:803AM	Plasma	Ok
4	11:12:08:590AM	Plasma	Ok
5	11:26:27:253AM	Plasma	Ok
6	11:39:35:163AM	Plasma	Ok
7	11:52:20:123AM	Plasma	Ok
8	12:05:21:567PM	Plasma	Ok
9	12:17:54:943PM	Plasma	Ok
10	12:30:30:730PM	Plasma	Ok
11	12:43:14:500PM	Plasma	Ok
12	12:55:58:363PM	Plasma	Ok
13	01:24:22:517PM	Plasma	Ok
14	01:40:13:070PM	Plasma	Ok
15	01:53:13:653PM	Plasma	Ok
16	02:05:53:627PM	Plasma	Ok
17	02:18:15:680PM	Plasma	Ok
18	02:30:58:933PM	Plasma	Ok
19	02:44:02:280PM	Plasma	Ok
20	02:56:45:990PM	Plasma	Ok
21	03:09:08:697PM	Plasma	Ok
22	03:21:48:513PM	Plasma	Ok
23	03:35:05:363PM	Plasma	Ok
24	03:48:32:777PM	Plasma	Ok
25	04:01:08:250PM	Plasma	Ok
26	04:16:58:567PM	Plasma	Ok
27	04:31:31:323PM	Plasma	Ok
28	04:43:43:060PM	Plasma	Ok
29	04:56:12:630PM	Plasma	Ok