| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Alexandre Parisot |
| Physics operator(s): | Ian Hutchinson |
| Engineering operator(s): | Ed Fitzgerald,Gary Dekow |
| Engineering Operator Run Comment |
| MP#447 Mode conversion current drive during startup PO:Hutchinson SL:Par |
| Session Leader Plans |
| Entered: Jun 22 2006 03:57:41:813PM |
| Author: Alexandre Parisot |
| Engineering setup for Friday 23-June-2006
SL: Parisot, Wukitch PO: Hutchinson Overnight ECDC in D2, and bake at 60 C. Run begins at 09:00 and ends at 17:00 Power systems as on 1060620013 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 + 2 psi Ne Hybrid DISABLED (PG1) fill B-side upper with 25 psi 3He Hybrid enabled *** (INCREASE FROM 15 psi TO 25 psi) *** fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill NINJA with 12 psi D2 Enabled ** 3He 75 msec puff at 0.0 sec *** Boronization system set up for between-shot boronization before the run but do not open the diborane bottle. *** All between shot boronizations (BSB) 10 minutes. Each sweep 200 seconds with a 20 second pause. All sweeps are 65-75 cm with pause at 70 cm. Boronization pressure set to 5 mTorr. Enable the following gate valves and shutters, assuming no vacuum problems: ECE, VUV, Z-bolo shutters; these must be disabled for between-shot boronization The A-Side TV camera shutter must be CLOSED before the boronizations (before the run and for the rest of the day). The MSE shutter must be CLOSED before the start of the run, and remain closed throughout the day. Important Diagnostics: FRC-ECE, He II monitor ICRF Setup: All 4 transmitters on run-on by 8:30 ------------------------------------------------------------------ Run plan MP#447: Mode conversion current drive during startup This is a continuation of 1060620. We want to reproduce shots 1060620013 and 1060620014, with between shot boronization to lower Zeff, and higher 3He concentration to optimize the electron heating (high B side upper pressure). 1] Start with 1060620013. Scan 3He puff duration 75ms,100ms,150ms With J-port [70ms-300ms] at 2 MW with notches, monitor electron heating and adjust Bt to obtain on-axis mode conversion with n3He ~ 20-25%. (4-5 shots) 2] Boronize 10 min. Add D&E-port 2 MW [70ms-300ms]. Scan co-current, counter-current drive and heating phasing. (3shots) If Zeff increases between the shots, repeat the scan, but boronize 10 min between each shot. (3shots) 3] Scan BT to investigate impact on CD and sawteeth. Depending on the results, continue on MP#447, or switch to MP440 (SL: Wukitch) 4) Boronization erosion dependence on antenna 1) BSB followed by a D/E heating shot (1060621025 except BT=5.4 T, 50 msec 3He puff @0.2 sec) 2) J heating shot (1060621025 except BT=5.0 T, Ip->0.92 MA) 3) BSB followed by J heating shot 4) D/E heating shot 5) BSB followed by two D/E heated discharges 6) BSB followed by two J heated discharges may repeat 1-4 depending upon results 5) use -90 and +90 and repeat 6) (5 shots) Upper single null plasma, H-mode power threshold comparison. (1060620002 except Ip-> 1 MA) |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jun 23 2006 05:28:56:900PM |
| Author: Alexandre Parisot |
|
We had a lot of unexpected events today, and consequently very few shots. We did a scan of the 3He puff duration on the first 3 discharges, since the pressure in the B-side-upper plenum was increased to 25 psi. We sucessfully puffed 3He starting 40 ms before breakdown, in an effort to get a sufficient 3He fraction in the plasma and thus mode conversion earlier in the ramp-up. However, these efforts were made useless by poor J-port performance in the ramp-up, much like last Wednesday (1060620). We put the run on standby the do one hour of multipactor conditionning on J-port, but this did not help. Therefore we decided to switch again to flattop MCCD experiments, attempting to keep Zeff down by boronizing between shots. These experiments were done at higher field than previously, so that the 3He concentration was closer to 25 %. This should give us better electron heating than before, although minority heating from D and E was quite uneffective at this field. After boronizing 10 minutes, heavy rain forced us to put the run on standby again for almost 2 hours in order to pump out water around the RF transmitters. After all these efforts, we were able to get four comparison discharges with different phasing. Shot 14 co-current drive Shot 15 counter-current drive Shot 16 heating phasing Shot 17 co-current drive These discharges will be analyzed to find indications of MCCD based on loop voltage differences and changes in the period and amplitude of sawtooth oscillations. |
| Physics Operator Summaries |
| Entered: Jun 23 2006 05:13:32:047PM |
| Author: Ian Hutchinson |
| Today was pretty boring from the Physop twiddling viewpoint.
The small number of shots was an effect of the large number of problems. These included breaker replacement, storm-drain backup into the RF area, together with boronization. That said, zero duds or fizzles. Scorecard: __________
Shot,Duration(s),Ipmax(MA),Result Shot,Duration(s),Ipmax,Result
| 01 1.388 0.814 Plasma | 02 1.382 0.812 Plasma |
| 03 1.381 0.811 Plasma | 04 0.315 0.794 Plasma |
| 05 1.964 1.000 Plasma | 06 1.953 1.004 Plasma |
| 07 1.972 0.694 Plasma | 08 1.974 0.709 Plasma |
| 09 1.309 0.699 Plasma | 10 1.977 0.674 Plasma |
| 11 1.328 0.661 Plasma | 12 1.926 0.635 Plasma |
| 13 1.972 0.665 Plasma | 14 1.973 0.712 Plasma |
| 15 1.974 0.696 Plasma | 16 1.974 0.694 Plasma |
| 17 1.972 0.696 Plasma
Date 1060623: 17 shots. 17 plasmas. 0 fizzles. 0 duds. 0 System Error.
(Plasma = Ip gt 50.0 kA Dud = H_alpha lt 0.40 V)
Total plasma duration: 28.74 s (exceeding -81 kA)
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| Session Leader Comments | |||
| Jun 23 2006 09:25:30:133AM | 1060623001 | Alexandre Parisot | 120 ms 3He puff. J-port has many faults.
Good on-axis heating is observed. Nl04 rise is comparable to 1060620013 and we have more pressure in B-side upper, yet the 3He monitor has less signal than 013. Why? Next: Puff 150ms. |
| Jun 23 2006 09:41:26:053AM | 1060623002 | Alexandre Parisot | 150 ms 3He puff. Thompson is back.
Signal is saturated on He II monitor, higher than 1060620013. Gate valve was closed after shot (left-over from yesterday). J is still struggling. Next: Puff -40 to 110 ms. |
| Jun 23 2006 10:23:11:063AM | 1060623003 | Alexandre Parisot | Puffing 3He earlier than break-down works !
Concentration estimate: 25-30 %, more than what we want. The heating is off-axis. The rise in He II signal is shifted by 40 ms. Next. Multipactor 1h hoping that this will bring J-port back in shape. Consequently, THERE WILL BE NO PLASMA ATTEMPTS FOR 1 1/2 HOURS. |
| Jun 23 2006 12:00:25:140PM | 1060623004 | Alexandre Parisot | Disrupted at 0.3 sec. Large injection.
RF still struggled. No RF cell data, match looks good. 3He puff -40 to 90ms. Next: Load 1060621025. Puff 3He 50 ms [.2-.25] |
| Jun 23 2006 12:08:37:890PM | 1060623005 | Alexandre Parisot | RF ran clean. Not sure 3He went in, heating is very weak.
No Thompson. Next. Go back to 100ms 3He puff. |
| Jun 23 2006 12:26:07:323PM | 1060623006 | Alexandre Parisot | RF ran clean again.
Next. Load 1060620008 (MP#356 - Flattop MCCD experiments) |
| Jun 23 2006 12:38:17:883PM | 1060623007 | Alexandre Parisot | J-port faulted at 0.81 s. D&E ran at 0.5 MW.
No break-in-slope data. Puff time was 200ms. Next: Retune J-port. |
| Jun 23 2006 12:58:35:923PM | 1060623008 | Alexandre Parisot | J ran with some faults.
Pellet at 1.04 sec. Next: bt0 to 5.8T and 3He puff duration to 180ms. |
| Jun 23 2006 01:11:11:217PM | 1060623009 | Alexandre Parisot | Good shot.
Next. Change phasing. |
| Jun 23 2006 01:27:00:980PM | 1060623010 | Alexandre Parisot | Injections early, density is different than in 009.
Next. Heating phase. |
| Jun 23 2006 01:33:56:713PM | 1060623011 | Alexandre Parisot | Disrupted at 1.22sec.
Next. Boronize 10 minutes. Repeat with co-current drive. |
| Jun 23 2006 03:49:48:823PM | 1060623012 | Alexandre Parisot | MARFE early. J has many faults (mismatched ?)
nl04 higher than before. Big storm. Needs to check if there is any water around FMIT# 3 & 4. "There is water all over the place". We can't run with that. Close off the diborane bottle and try to dry out the transmitter area, hopefully before the next storm. Assuming no more water problems in the meantime, we will resume plasma attempts at 4:20 (30min filament warmup on FMIT#3 and 4). |
| Jun 23 2006 04:30:39:300PM | 1060623013 | Alexandre Parisot | Plasma. Runaways early.
Faulty RF, apparently post-boronization pathology. Next: Cross fingers and repeat |
| Jun 23 2006 04:33:45:957PM | 1060623014 | Alexandre Parisot | Plasma. J has 4 faults.
Next. Go counter-CD. |
| Jun 23 2006 04:44:33:210PM | 1060623015 | Alexandre Parisot | Plasma. Clean RF.
Next. Heating phasing. |
| Jun 23 2006 04:59:10:127PM | 1060623016 | Alexandre Parisot | Plasma. Clean RF.
Next. One more shot, co-current drive phasing. |
| Jun 23 2006 05:11:05:563PM | 1060623017 | Alexandre Parisot | Plasma. 2 faults on J-port, one early, one late.
End of run. |
| Physics Operator Comments | |||
| Jun 23 2006 09:11:32:810AM | Ian Hutchinson | Load from 1060620013. This is running in segment 4. 0.8MA upper null.
He3 pressure is 25psi instead of 15, so we should get more He3. Load into model. | |
| Jun 23 2006 09:36:48:287AM | 1060623001 | Ian Hutchinson | Plasma.
He3 gas puff to 150ms (from 120). |
| Jun 23 2006 09:49:59:740AM | 1060623002 | Ian Hutchinson | Plasma.
He3 puff to -40ms to +110ms. |
| Jun 23 2006 10:12:38:110AM | 1060623003 | Ian Hutchinson | Plasma.
He3 is present in the monitor at breakdown, but the total fill pressure is not significantly changed by it. |
| Jun 23 2006 12:00:41:437PM | 1060623004 | Ian Hutchinson | Prior to this shot we do multipacting of J-port antenna for about 1 hour to try
to improve its performance. He3 puff to -40ms to 90ms. Plasma disrupts at .31s. Density is quite high. Big radiative event near time of last RF trip. Fill puff gives only a very low fill pressure because the plenum was depleted to 2psi instead of 6psi. Load from 1060621025. Change He3 puff to 50ms total (.2-.25s) |
| Jun 23 2006 12:24:45:057PM | 1060623005 | Ian Hutchinson | Plasma.
He3 puff to 100ms (.2-.3s). Enable LPI gate valve. |
| Jun 23 2006 12:33:22:963PM | 1060623006 | Ian Hutchinson | Plasma
Load 1060620008. Load. |
| Jun 23 2006 12:49:23:053PM | 1060623007 | Ian Hutchinson | Plasma. |
| Jun 23 2006 01:12:22:403PM | 1060623008 | Ian Hutchinson | Plasma. Found that not all gate valves were open for the last 3 shots, which
explains the high base pressure. TF to 160kA (5.8T). He3 puff to 180ms from 200ms. |
| Jun 23 2006 02:10:04:813PM | 1060623011 | Ian Hutchinson | Plasma.Disrupts at 1.3s
Boronize for 10 minutes. Lower fill puff to 8ms. Wait for base pressure to reach 4e-6. |
| Jun 23 2006 02:32:29:483PM | 1060623011 | Ian Hutchinson | Plasma.
Fill puff to 11ms. Thunderstorm fills the RF trench with water and calls a halt. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:10:06:207AM | Plasma | Ok | |
| 2 | 09:24:05:397AM | Plasma | Ok | |
| 3 | 09:41:24:990AM | Plasma | Ok | |
| 4 | 11:46:14:797AM | Plasma | Ok | |
| 5 | 12:01:16:047PM | Plasma | Ok | |
| 6 | 12:15:05:373PM | Plasma | Ok | |
| 7 | 12:30:51:290PM | Plasma | Ok | |
| 8 | 12:47:34:133PM | Plasma | Ok | |
| 9 | 01:01:42:050PM | Plasma | Ok | |
| 10 | 01:16:39:810PM | Plasma | Ok | |
| 11 | 01:29:20:450PM | Plasma | Ok | |
| 12 | 02:12:42:483PM | Plasma | Ok | |
| 13 | 04:17:31:110PM | Plasma | Ok | |
| 14 | 04:30:06:503PM | Plasma | Ok | |
| 15 | 04:42:33:257PM | Plasma | Ok | |
| 16 | 04:55:53:520PM | Plasma | Ok | |
| 17 | 05:08:23:080PM | Plasma | Ok | |