| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Robert Granetz |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Andy Pfeiffer,Bill Byford,Ed Fitzgerald |
| Engineering Operator Run Comment |
| MP #424 -- Gas jet disruption mitigation Session leaders: R. Granetz, D. |
| Session Leader Plans |
| Entered: Jul 21 2005 07:23:39:343AM |
| Author: Robert Granetz |
| MP #424 -- Gas jet disruption mitigation Session leaders: R. Granetz, D. Whyte Physics operator: S. Wolfe ECDC (requested by J. Irby); bake at 60 C. Run begins at 09:00 and ends at 17:00. Power systems as on 1050603028 (1.0 MA, 5.4 T, SNL fiducial) 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 DISABLED (PG1) leave B-side upper with whatever Hybrid disabled fill B-main (C-side) with 30 psi D2 Hybrid enabled (PG3) No NINJA for this run. Gas jet should have high-pressure ( >70 bar) neon bottle installed, WITH HIGH-PRESSURE HELIUM AND ARGON BOTTLES READY TO BE SWITCHED IN DURING THE RUN. Torvac setup: unnecessary diagnostic gate valves (ECE) should be kept closed on all gas jet shots. Enable the following, assuming no vacuum problems: Z-bolo shutters, VUV (yes, enable the VUV gate valve) Necessary diagnostics: IR camera Fast PSI camera on B-horizontal, starting at t=0.800 s, Ne+0, He+0, Ar+0 filters Thomson scattering, with adjustable timing between the two lasers Bolometry AXUV array with reduced gain Halo current Rogowskis SX arrays with fast sampling window (t=0.795 to 0.820 s) Mirnov Bp fluctuations ------------------------------------------------------------------------------- ICRF Setup: All transmitters in run on at 08:30, but begin the run with ohmic discharges. ------------------------------------------------------------------------------- Run plan: Start with neon at 70 bar, 2 ms. Get IR divertor images, AXUV profiles, global bolometry, fast visible camera images, as well as disruption quench data (halo currents, timescales). Then turn on RF to get higher Wth and pressure -- same drill. About halfway through the run, switch to helium at 70 bar, 2 ms. Get VUV data to look at self-absorption issues. Save the last hour of the run for argon. Compare quench times with helium and neon. |
| Physics Operators Plans |
| Entered: Jul 20 2005 02:56:30:937PM |
| Author: Steve Wolfe |
MP #424 -- Gas jet disruption mitigation
Session leaders: R. Granetz, D. Whyte
Physics operator: S. Wolfe
ECDC (requested by J. Irby); bake at 60 C.
Run begins at 09:00 and ends at 17:00.
Power systems as on 1050603028 (1.0 MA, 5.4 T, SNL fiducial)
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 DISABLED (PG1)
leave B-side upper with 15 psi He3 Hybrid disabled (PG2)
fill B-main (C-side) with 30 psi D2 Hybrid enabled (PG3)
No NINJA for this run.
Gas jet should have high-pressure ( >70 bar) neon bottle installed, WITH
HIGH-PRESSURE HELIUM AND ARGON BOTTLES READY TO BE SWITCHED IN DURING THE
RUN.
Torvac setup: unnecessary diagnostic gate valves (ECE) should be kept
closed on all gas jet shots.
Enable the following, assuming no vacuum problems:
Z-bolo shutters, VUV (yes, enable the VUV gate valve- per JT)
Necessary diagnostics:
IR camera
Fast PSI camera on B-horizontal, starting at t=0.800 s, Ne+0, He+0, Ar+0
filters
Thomson scattering, with adjustable timing between the two lasers
Bolometry
AXUV array with reduced gain
Halo current Rogowskis
SX arrays with fast sampling window (t=0.795 to 0.820 s)
Mirnov Bp fluctuations
-------------------------------------------------------------------------------
ICRF Setup: All transmitters in run on at 08:30, but begin the run with
ohmic discharges.
-------------------------------------------------------------------------------
Run plan: Start with neon at 70 bar, 2 ms. Get IR divertor images, AXUV
profiles, global bolometry, fast visible camera images, as well
as disruption quench data (halo currents, timescales). Then turn
on RF, He3 puff, to get higher Wth and pressure -- same drill.
About halfway through the run, switch to helium at 70 bar, 2 ms.
Get VUV data to look at self-absorption issues.
Save the last hour of the run for argon. Compare quench times
with helium and neon.
|
| Session Leader Summaries |
| Entered: Jul 21 2005 05:10:39:257PM |
| Author: Robert Granetz |
| We only had one shot today due to a problem with the TF scanner system. On that shot (1050721001) we successfully fired a neon gas jet and got a disruption that was faster than normal, as we saw on the previous gas jet run (1050603). The AXUV is getting the entire disruption without saturating. Mirnov coils showed a clear n=1 (and low m) just before the quench. However, the IR camera and the fast visible camera were not turned on for this shot, although they both were ready for shot 2, which never happened. We will try this run again tomorrow (Friday). |
| Physics Operator Summaries |
| Entered: Jul 21 2005 05:12:39:117PM |
| Author: Steve Wolfe |
We only got one shot today because of a problem with the PC
controlling the TF scanner. 1050721001 was a successful gas
jet disruption, as programmed.
After the shot, the TF scanner did not run, and it was found
that the TFTC PC was unresponsive and would not reboot. Eventually,
the D-drive was replaced and restored from backup tape, but
the labview routine would still not communicate with the HP
scanner in the cell. By five o'clock there was some indication
that a fiber link was broken, but this has not yet been confirmed.
We will try to run the same experiment tomorrow.
Scorecard:
Plasmas 1
Fizzles 0
Duds 0
Tests 8
------- --
Shots 9
|
| Session Leader Comments | |||
| Jul 21 2005 07:36:13:853AM | Robert Granetz | I set up an XTOMO fast digitization window from t=0.795 to 0.825 s. Sampling rate is set for 50 kHz during the fast window. | |
| Jul 21 2005 07:50:59:707AM | Robert Granetz | Gas jet plenum is filled with 70 bar of neon. Gas jet system is ready to go. | |
| Jul 21 2005 08:09:47:217AM | Robert Granetz | Node \xtomo::top.camac:J221:output_12 turned on (gas jet trigger). Timing is set for 2 ms pulse starting at t=0.8000 s. | |
| Jul 21 2005 08:59:38:243AM | Robert Granetz | We're ready to go, but Jim Terry and Dennis Whyte have not arrived yet, so I don't know the status of the fast PSI camera and the IR camera. | |
| Jul 21 2005 09:47:49:927AM | 1050721001 | Robert Granetz | Shot 01 -- Good shot. Gas jet worked. Thermal quench started around t=0.809 s. I_halo=150 kA. AXUV got the entire quench without saturating. Joe Snipes sees an n=1 (probably), with low m. Part of xtomo array_3 has no finite signal. Halo inboard toroidal array didn't trigger. Plenum gas: neon Pulse length (ms): 2.0 Plenum pre -pulse pressure (bar): 70.5 Plenum post-pulse pressure (bar): 63.5 Plenum change in pressure (bar): 7. |
| Jul 21 2005 10:12:15:530AM | 1050721001 | Robert Granetz | We're in a hold between shots 1 and 2 in order to fix a problem with the TF scanner. |
| Jul 21 2005 11:22:50:303AM | 1050721001 | Dennis Whyte | Injected neon inventory from bottle: ~1600 Torr-L
B-Bottom MKS gives us ~1200 Torr-L based on 4.06 m3 vessel volume. So we still have a discrepancy in the gas inventory, but it looks less than that last run 06/03 |
| Jul 21 2005 10:11:38:230AM | 1050721002 | Robert Granetz | 3 MW of ICRF will turn on at t=0.7 for this shot, and probably for the rest of the run. |
| Physics Operator Comments | |||
| Jul 21 2005 07:19:26:437AM | Steve Wolfe | We had overnight ECDC and 60C bake Setup for 2nd gas jet run Load from 1050603028 Startup has 27ms pg4, Br0=+.00025,ic_ef4u=-1320 This was robust on 1050603, so leave it for now, except decrease pg4 to 21msec Seg2 is 1MA, 5.4T, nl04=1e20, no pg3 puff change tf to 144000A (~5.2T) for better D(He3) Load at 21-Jul-2005 07:18:52.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| Jul 21 2005 09:07:21:147AM | 1050721001 | Steve Wolfe | Shot#1: Bob's ready; JT and DW not in yet. First shot will be with gas jet at 0.8 plasma disrupted at 0.8sec Very late breakdown 10msec next: ef4 to -1310, br0 to 0 Dennis and JT are now in the room |
| Jul 21 2005 10:12:17:870AM | 1050721001 | Steve Wolfe | Shot#2: ef4 from -1320 to -1310, br0 to from +.00025 to 0 Over 60 minute delay while people get set up and there is a problem with the TF scanner PC |
| Jul 21 2005 10:40:21:230AM | 1050721002 | Steve Wolfe | Shot#2: ef4 from -1320 to -1310, br0 to from +.00025 to 0 He3 puff on at .3 off at .4 and enable b-side upper Add 2psi Ne to the 1psi Ar in b-side lower and enable (pg1 puff=50ms) Delay for the TF scanner computer will be at least another hour (from 10:40AM) |
| Jul 21 2005 11:46:46:303AM | 1050721002 | Steve Wolfe | Shot#2: No Power shot to see if TF scanner PC is really fixed. It wasn't. There will be another delay while files are redirected to the disk that is still alive |
| Jul 21 2005 12:00:45:117PM | 1050721003 | Steve Wolfe | Shot#3: Another No Power shot to see if TF scanner PC is fixed now. It ran for awhile, then stopped? |
| Jul 21 2005 12:15:35:790PM | 1050721004 | Steve Wolfe | Shot#4: Another No Power shot to see if TF scanner PC is fixed now. Still not working. maybe understood. Will try once more. |
| Jul 21 2005 12:31:04:197PM | 1050721005 | Steve Wolfe | Shot#5: Another No Power shot to see if TF scanner PC is fixed now. No joy. try putting in a new D-drive. |
| Jul 21 2005 01:14:36:273PM | 1050721006 | Steve Wolfe | Shot#6: Another No Power shot to see if TF scanner PC is fixed by putting in a new D-drive. Still not working. |
| Jul 21 2005 01:49:33:930PM | 1050721007 | Steve Wolfe | Shot#7: Another No Power shot to test TF scanner Not working and the debugger isn't working on it. |
| Jul 21 2005 02:48:02:180PM | 1050721008 | Steve Wolfe | Shot#8: They found a cable not connected; try another no power shot. Not working yet. Reboot the thing in the cell and the computer and try again |
| Jul 21 2005 05:06:43:167PM | 1050721009 | Steve Wolfe | Shot#9: Reboot the thing in the cell and the computer and try again There is still a communication problem. |
| Jul 21 2005 05:52:33:727PM | 1050721010 | Steve Wolfe | Shot#10: post-run test shot after the TF scanneeeer seemed to work in manual tests. It seems to have worked. |
| Jul 21 2005 05:59:50:260PM | 1050721011 | Steve Wolfe | Shot#11: 2nd post-run test shot after the TF scanner seemed to work in manual tests. Worked a second shot (with no PEI current, so it is basically showing bitnoise/bitnoise, but the data do show up.) |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:01:59:540AM | Plasma | Ok | |
| 2 | 11:31:49:337AM | Test | Bad | TF scanner Failed |
| 3 | 11:53:39:150AM | Test | Bad | TF Scanner Problems |
| 4 | 12:08:38:087PM | Test | Ok | TF Scanner test |
| 5 | 12:22:26:133PM | Test | Ok | TF Scanner Test |
| 6 | 01:04:40:883PM | Test | Ok | TF Scanner Test |
| 7 | 01:24:59:853PM | Test | Ok | TF Scanner Test |
| 8 | 02:21:49:507PM | Test | Ok | This was a no power test shot |
| 9 | 03:57:51:930PM | Test | Ok | This was a no power test shot. |
| 10 | 05:44:57:727PM | Test | Ok | |
| 11 | 05:53:41:320PM | Test | Ok | |