| Miniproposals | ||||||||||||
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| Operators | |
| Session leader(s): | Amanda Hubbard,Rajesh Maingi,Kirill Zhurovich |
| Physics operator(s): | Ron Parker |
| Engineering operator(s): | Andy Pfeiffer,Ed Fitzgerald,Gary Dekow |
| Engineering Operator Run Comment |
| MP 448, Comparison of Small ELM regimes on C-Mod, MAST and NSTX Session |
| Session Leader Plans |
| Entered: May 3 2006 04:03:22:057PM |
| Author: Amanda Hubbard |
| Run Plan for of 1060504, MP 448, Comparison of Small ELM regimes on C-Mod, MAST and NSTX
Session Leaders: Rajesh Maingi (PPPL) , Amanda Hubbard , Hendrik Meyer (remote from UKAEA) Physics Operator: Ron Parker Goal: Complete C-Mod part of Small ELM pedestal comparisons by going to high power, nu* scan This run requires overnight boronization and all 3 RF antennas. A delayed start to resolve E-port issues is thus possible. 1) Load and repeat shot 1060407033 ; 5.45 T, 708 kA, nel 7e19 m-2. 2) Allow RF group several discharges to tune and bring up J and E power. Assess maximum available power. If 4 MW or more, continue to step 3. If not, punt and go to plan B - TBD by Steve Wolfe. 3) Density scan: Keeping power, and hopefully beta, in its upper range, scan target density shot to shot to vary nped, Tped and thus n*. Use two power levels per shot, selected based on results of step two. Start by raising target nel (9x 1019 m-2, 1.1x 1020 m-2, 1.3x1020 m-2, 1.5x1020 m-2. Upper limit will probably be set by neutral pressure limit of J-port, or if we are lucky, a transition to Type III ELMs. Then scan downwards, 7x 1019 m-2 ,6x 1019 m-2. The limit in this case will be losing EDA and getting either transient ELM-free H-modes or, more interestingly, discrete Type I ELMs. |
| Physics Operators Plans |
| Entered: May 3 2006 06:03:16:667PM |
| Author: Ron Parker |
| Run Plan for of 1060504, MP 448, Comparison of Small ELM regimes on C-Mod, MAST and NSTX
Session Leaders: Rajesh Maingi (PPPL) , Amanda Hubbard , Hendrik Meyer (remote from UKAEA) Physics Operator: Ron Parker Goal: Complete C-Mod part of Small ELM pedestal comparisons by going to high power, nu* scan This run requires overnight boronization and all 3 RF antennas. A delayed start to resolve E-port issues is thus possible. Overnight boronization on Wednesday 5/3/2006: 20% B2D6 / 80% He 6L bottle. vessel temperature at 60/60/60. 60 psi to be deposited. PEI setting to 44/70/103 (Rmin/Rres/Rmax) with no pulser. Gas Pressures: TC3/TC6/TC9/TC6Request = [4 to 7]/150/95/150 Follow boronization with 4 hours ECDC in helium. 1) Load and repeat shot 1060407033 ; 5.45 T, 708 kA, nel 7e19 m-2. 2) Allow RF group several discharges to tune and bring up J and E power. Assess maximum available power. If 4 MW or more, continue to step 3. If not, punt and go to plan B - TBD by Steve Wolfe. Engineering setup: Power systems as on 1060407033 A-coil configuration: normal [+Dtop -Dbot -Jtop +Jbot] and enabled. C-coil Start=0.3sec, Invert=2.0sec all ICRF systems in run-on by 8:30 am. Gas Setup: ---------- fill B-top 6psi D2 Hybrid enabled (PG4) fill B-side lower 1 psi Argon Hybrid Disabled (PG1) fill B-side Upper as is, Hybrid Disabled (PG2) fill B-main 40psi D2 Hybrid Enabled (PG3) NINJA: 12psi D2 Enable ECE, VUV, Z-bolo shutter assuming no vacuum problems |
| Session Leader Summaries |
| Entered: May 4 2006 03:59:22:800PM |
| Author: Amanda Hubbard |
| We essentially followed the plan below. The target discharge worked reliably from shot 1 and was not varied; very good shape match and in general long, steady, fairly clean-looking EDA H-modes were obtained.
The morning was spent on Step 2, attempting to bring up the RF. After numerous attempts and some vacuum conditioning, D and E port were getting ~ 2 MW combined, with some E-port trips. But, J-port was tripping at only ~ 0.6 MW. Since the total power was insufficient to raise beta_ped, it was decided after shot 9 (about 1 pm) to turn the run over to Kirill for ITB studies. Step 3 thus remains to be attempted on another day. ***************************************************************************** Run Plan for of 1060504, MP 448, Comparison of Small ELM regimes on C-Mod, MAST and NSTX Session Leaders: Rajesh Maingi (PPPL) , Amanda Hubbard , Hendrik Meyer (remote from UKAEA) Physics Operator: Ron Parker Goal: Complete C-Mod part of Small ELM pedestal comparisons by going to high power, nu* scan This run requires overnight boronization and all 3 RF antennas. A delayed start to resolve E-port issues is thus possible. 1) Load and repeat shot 1060407033 ; 5.45 T, 708 kA, nel 7e19 m-2. 2) Allow RF group several discharges to tune and bring up J and E power. Assess maximum available power. If 4 MW or more, continue to step 3. If not, punt and go to plan B - TBD by Steve Wolfe. 3) Density scan: Keeping power, and hopefully beta, in its upper range, scan target density shot to shot to vary nped, Tped and thus n*. Use two power levels per shot, selected based on results of step two. Start by raising target nel (9x 1019 m-2, 1.1x 1020 m-2, 1.3x1020 m-2, 1.5x1020 m-2. Upper limit will probably be set by neutral pressure limit of J-port, or if we are lucky, a transition to Type III ELMs. Then scan downwards, 7x 1019 m-2 ,6x 1019 m-2. The limit in this case will be losing EDA and getting either transient ELM-free H-modes or, more interestingly, discrete Type I ELMs. |
| Entered: May 4 2006 05:13:53:283PM |
| Author: Kirill Zhurovich |
| Second half of the day:
MP 445 "Ti measurements in ITB plasmas" SL: Kirill Zhurovich PO: Ron Parker The run was delayed by ~2hrs due to some problems with TF power supply. Machine performance was better than on 1060502, but still worse than in the past. We got a couple of ITBs at 6.45T and 6.3T. H-modes at 6.1T and 5.9T were long with multiple minor back transitions. Got HIREX measurements for these cases. Looks like we've got 4 useful shots for comparison of Ti gradients for ITB vs. non-ITB cases. |
| Physics Operator Summaries |
| Entered: May 4 2006 05:18:32:970PM |
| Author: Ron Parker |
| The run was disappointing because of the lack of power from the J-port antenna. This resulted in terminating the planned MP after 9 shots, and switching to a backup MP with Kirill as session leader. Several good shots were obtained and a systematic scan of field and current was carried out. There was one extended outage due to failure and repair of a PLC module used to control the TF. This resulted in a delay lasting almost 2 hours. After repair, the TF and the machine ran reasonably well for the remainder of the run.
Scorecard: 23 shots, 2 fizzles, 1 disruption, 2 no-TF shots, 1 TF power test and 17 full length plasmas. |
| Session Leader Comments | |||
| May 4 2006 09:16:25:010AM | 1060504001 | Amanda Hubbard | Lovely plasma, but very little RF. nel only 5.8e19 m-2, but it will probably rise once RF added. Retune and repeat. |
| May 4 2006 10:25:22:877AM | 1060504002 | XP 448: small ELM regime comparison.
Shape: LSN with scaled poloidal cross-section matching MAST and NSTX. Probably need ~ 4 MW RF power to see the small ELMs. | |
| May 4 2006 10:27:00:173AM | 1060504003 | Steady EDA, peak electron_beta@95% flux ~ 0.16 | |
| May 4 2006 10:27:42:817AM | 1060504004 | Steady EDA again, peak electron_beta_t@95% flux ~ 0.15 | |
| May 4 2006 11:21:58:113AM | 1060504005 | 2 MW RF power, peak electron beta_t@95% up to 0.2. Probably need at least
0.35-0.4%. | |
| May 4 2006 10:55:35:987AM | 1060504006 | Amanda Hubbard | Got 2 MW again, plus a little from J which RF guys think is arcing.
Stopping to vaccum condition. This shot had impurity injections ~0.85 secs - which has been unusual today. |
| May 4 2006 11:23:57:440AM | 1060504006 | Peak electron beta_t @ 95% is 0.2 again, and Temax ~ 500 eV.
No sign of small ELMs yet. | |
| May 4 2006 12:32:03:423PM | 1060504008 | Peak electron beta_t @ 95% is 0.15 again, and Temax ~ 400 eV.
No sign of small ELMs. | |
| May 4 2006 12:43:20:270PM | 1060504009 | Peak electron beta_t @ 95% is 0.2 again, and Temax ~ 500 eV.
No sign of small ELMs. | |
| May 4 2006 01:05:40:597PM | 1060504010 | Kirill Zhurovich | H-mode, but disrupted at ~0.84s |
| May 4 2006 01:31:59:113PM | 1060504011 | Kirill Zhurovich | strange, but bad shot: no plasma.
it is said that no TF. |
| May 4 2006 01:32:21:363PM | 1060504012 | Kirill Zhurovich | No plasma. No TF again. |
| May 4 2006 02:54:19:580PM | 1060504013 | Kirill Zhurovich | Test shot - YAGs are on target |
| May 4 2006 03:07:58:067PM | 1060504014 | Kirill Zhurovich | 2 Major H-modes with a number of minor back transitions.
Looks like ITB Next: repeat, but increase Ar puff to 40ms |
| May 4 2006 03:31:26:910PM | 1060504015 | Kirill Zhurovich | Late H-mode, no ITB
Next: reduce target density by 10% to 1*10^20 in pcs, Go to 6.3T (current proportionally) |
| May 4 2006 03:44:57:440PM | 1060504016 | Kirill Zhurovich | Nice long H-mode with ITB forming at ~1.2s (there is a change in H-alpha at ~1s)
Next: lower Bt to 6.1T |
| May 4 2006 03:52:55:440PM | 1060504017 | Kirill Zhurovich | Delayed H-mode. No ITB at this field
HIREX has not got data due to HV trips Next: repeat, but decrease target density by 10% |
| May 4 2006 04:05:17:270PM | 1060504018 | Kirill Zhurovich | Brief H-mode due to RF trip
Next: go to 5.9T |
| May 4 2006 04:20:54:690PM | 1060504019 | Kirill Zhurovich | Long H-mode with several minor back transitions.
Was not good shot for HIREX Next: repeat |
| May 4 2006 04:25:03:783PM | 1060504020 | Kirill Zhurovich | fizzle |
| May 4 2006 04:43:09:143PM | 1060504021 | Kirill Zhurovich | Long H-mode with several minor back transitions.
Next: 5.7T |
| May 4 2006 04:53:26:597PM | 1060504022 | Kirill Zhurovich | Long H-mode with several minor back transitions.
HIREX lost one of its channels due to HV trip next: repeat |
| May 4 2006 05:02:51:317PM | 1060504022 | Kirill Zhurovich | fizzle
end of run |
| Physics Operator Comments | |||
| May 4 2006 09:17:52:793AM | 1060504001 | Ron Parker | Shot 1 ran well. Need to bring up RF power. |
| May 4 2006 09:26:22:747AM | 1060504002 | Ron Parker | Shot 2 ran well, 1 MW of RF, Steady H-mode. |
| May 4 2006 09:37:01:260AM | 1060504003 | Ron Parker | Shot 3 was similar to 2, RF still at 1 MW. |
| May 4 2006 09:48:23:293AM | 1060504004 | Ron Parker | Shot 4 was good, RF still 1 MW for most of the RF pulse. |
| May 4 2006 09:58:53:410AM | 1060504004 | Ron Parker | Short (?) delay for power room access. |
| May 4 2006 10:20:12:033AM | 1060504005 | Ron Parker | Shot ran well, RF power up to 2 MW. |
| May 4 2006 10:29:01:957AM | 1060504006 | Ron Parker | Shots continue to run well. RF remains at 2 MW level. |
| May 4 2006 10:36:39:660AM | 1060504006 | Ron Parker | Argon-Neon injection on next shot.
There will be a delay (~ 30 minutes?) while the J-port RF antenna is vacuum conditioned. |
| May 4 2006 12:14:50:423PM | 1060504007 | Jim Irby | no changes since Ron left
plasma into rampdown --- late breakdown --- gas 10% lower than on shot 006 2nd example of TCI drift problem today |
| May 4 2006 12:29:59:020PM | 1060504008 | Jim Irby | prepuff from 18 to 19 ms
plasma into rampdown |
| May 4 2006 12:45:03:423PM | 1060504009 | Ron Parker | Shot 9 ran well, RF power averaged about 2 MW. |
| May 4 2006 12:56:56:567PM | 1060504009 | Ron Parker | It looks like we are giving up on the run plan due to lack of performance of J-port. We are turning things over to Kirill and continuation of MP 445 (see run plan for 1060502). We'll start by loading shot 1060502014. |
| May 4 2006 01:07:07:237PM | 1060504010 | Ron Parker | Shot 10 disrupted, not clear why. |
| May 4 2006 01:17:40:067PM | 1060504011 | Ron Parker | No TF, no shot |
| May 4 2006 01:32:55:253PM | 1060504012 | Ron Parker | Same thing, no TF; actually TF came on a level of 0.45 T, then shut down apparently due to fizzle detection. We'll have a power room access to investigate. |
| May 4 2006 02:36:58:317PM | 1060504012 | Ron Parker | Problem with the TF seems to be a bad PLC module. It has been replaced and we are about to do a 50 kA TF test. |
| May 4 2006 02:48:56:393PM | 1060504013 | Ron Parker | TF shot at 50 kA was OK. We'll set up for plasma on next shot. |
| May 4 2006 03:06:58:470PM | 1060504014 | Ron Parker | Shot 14 went off as programmed. Next: same shot, but Ar puff increased to 40 ms. |
| May 4 2006 03:32:42:753PM | 1060504015 | Ron Parker | Shot 15 ran well, H-mode at RF = 2.1 MW.
Next shot: Target density lowered from 1.1e20 m-2 to 1.0e20. Also TF lowered from 6.45 to 6.3T and Ip from 1.02 to 0.996 MA |
| May 4 2006 03:45:18:660PM | 1060504016 | Ron Parker | Good shot, long RF pulse at 2.1 MW
Next: reduce field from 6.3 to 6.1, current from 996 to 964 kA. |
| May 4 2006 03:52:03:613PM | 1060504017 | Ron Parker | Good shot. Next: same B and I, but reduce target density to 0.95e20 m-2. |
| May 4 2006 04:09:42:113PM | 1060504018 | Ron Parker | Shot went off OK, but RF didn't hold up.
Next: Field lowered to 5.9, current to 932 kA. |
| May 4 2006 04:31:19:707PM | 1060504019 | Ron Parker | Shot 19 went off as programmed.
No change for next shot. |
| May 4 2006 04:29:12:550PM | 1060504020 | Ron Parker | Shot 20 fizzled. Pressure may be a bit too high, so reduce from 19 to 17 ms for next shot. |
| May 4 2006 04:45:45:253PM | 1060504021 | Ron Parker | Shot 21 ran well. Next: 5.7 T, 900 kA |
| May 4 2006 04:56:36:457PM | 1060504022 | Ron Parker | Shot 22 went off well, but incomplete data from Hirex. So we'll repeat.
|
| May 4 2006 05:03:39:707PM | 1060504023 | Ron Parker | Shot 23 fizzled. Machine is getting dirty. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:01:46:827AM | Plasma | Ok | |
| 2 | 09:18:17:967AM | Plasma | Ok | |
| 3 | 09:30:58:887AM | Plasma | Ok | |
| 4 | 09:43:44:543AM | Plasma | Ok | |
| 5 | 10:09:29:363AM | Plasma | Ok | |
| 6 | 10:21:57:020AM | Plasma | Ok | |
| 7 | 12:07:29:910PM | Plasma | Ok | |
| 8 | 12:26:33:597PM | Plasma | Ok | |
| 9 | 12:39:38:550PM | Plasma | Ok | |
| 10 | 01:02:14:753PM | Plasma | Ok | |
| 11 | 01:14:52:393PM | Plasma | Bad | TF Power Level Wrong |
| 12 | 01:29:34:817PM | Plasma | Bad | TF Miss Fired |
| 13 | 02:46:41:923PM | Test | Ok | 50 KA TF PLC Test |
| 14 | 02:59:17:800PM | Plasma | Ok | |
| 15 | 03:14:46:097PM | Plasma | Ok | |
| 16 | 03:31:39:080PM | Plasma | Ok | |
| 17 | 03:44:18:410PM | Plasma | Ok | |
| 18 | 03:57:00:270PM | Plasma | Ok | |
| 19 | 04:09:51:707PM | Plasma | Ok | |
| 20 | 04:22:18:020PM | Plasma | Ok | |
| 21 | 04:34:49:097PM | Plasma | Ok | |
| 22 | 04:48:06:207PM | Plasma | Ok | |
| 23 | 05:00:59:720PM | Plasma | Ok | |