| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | John Rice |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Ed Fitzgerald,Gary Dekow,Bill Byford |
| Engineering Operator Run Comment |
| MP#375 Rotation and threshold vs SSEP; SL:Rice; PO:Wolfe; EO:Dekow/Byfor |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:02:430PM |
| Author: John Rice |
| Session Leader Run Summary for 1040123 MP375 Rotation and H-mode Threshold vs SSEP The first part of the run was achieved: the variation of the ambient L-mode rotation velocity was determined as a function of SSEP, in 2 mm steps. There is a very abrupt change in the core rotation velocity, going from about -18 km/s with an SSEP of -3 mm to -38 km/s with an SSEP of +1 mm. The trend of the rotation in the SOL is awaiting further analysis. This suggests that care should be taken about what one considers to be truly Double Null. The second part of the run, to determine the H-mode power threshold for the same discharges, was not achieved because the ICRF power level was limited to 3 MW since the J-port transmitter was out of service. This was not enough to induce H-mode with SSEP greater than +2 mm. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:48:693PM |
| Author: Steve Wolfe |
| Physics Operator Summary for Friday, Jan 23, 2004 MP#375 Rotation and threshold vs SSEP SL: Rice PO: Wolfe EO: Dekow,Fitzgerald,Byford ECDC Overnight in D2, stopping by 07:00 60C Bake (optional, check with Irby and/or Bill Burke) Run Begins at 09:00 and ends at 17:00 Engineering setup ----------------- Power Systems as on 1031125008 Gas System 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 C-side with 30 psi D2 Hybrid enabled (PG3) fill NINJA (lower cap) with 6psi Helium Gate valve permissives for the usual suspectsd (ECE,VUV,DNB) assuming no vacuum problems RF: Transmitters #1 and 2 in RUN-ON by 08:00 PCS Setup: Seg 1: from 1040122??? Seg 2: from 1031125008 (on for shot 1) Seg 4: from 1031125018 (off for shot 1), change TF to 150000 (B=5.4) put a dummy clearin on wire9 referencing the upper null to check offset,etc. Run Plan --------- For all shots, RF program ramp from 0 to 3.0MW (or max available) between 0.9 and 1.5 sec. Start with 800kA LSN as on 1031125008 (2 shots) Switch to seg4 to run near DN like 1031125018 and adjust gaps per LaBombard, Hughes (? shots) Scan SSEP from -.01m to +.01m in 1mm steps (21 shots). Try to keep gaps constant by changing to upper xpoint reference on clearin once we get to SSEP>0. ---------------------------------------------------------------------------- Results: We ended up getting a pretty good scan of SSEP, though not quite at the resolution called for in the MP. The RF was limited to 3MW max, and this turned out to be insufficient to get H-modes in the solidly upper null part of the scan. John and Brian did get good data on the rotation in the core and SOL over the whole range, with some pretty good statistics. Once again, control with SSEP proved to be somewhat problematic, in this case, when we started trying to use positive values. As in previous runs, once the plasmas became upper null the CLEARIN control was lost. I attempted to improve this by changing the xpoint reference of CLEARIN to zxa=+.395. This worked close to DN, with an offset of 9000 (rather than 12700 for zxa=-.395), but at larger positive SSEP>.005 or so, the ZXU position had moved so far down that the gap control was again lost, and control of SSEP was poor. The problem seems to be that the SSEP controller is essentially controlling ZXU, but for SSEP>0 it would be better to control ZXL. A more symmetric control scheme would be preferable, with both ZXL and ZXU gains turned down and the SSEP controller allowed to vary both. An attempt to change the SSEP controller to move ZXL in place of ZXU led to an early disruption (#28). Finally, to get values of SSEP>.008m we went to an upper null equilibrium from 1031125030 in segment 3 (#29), and varied ZXL between -.04 and -.02. To avoid a disruption which may have been caused by touching the nose, the RXL value was moved from -.01 to 0. A final beam-into-gas shot was taken (#34) after 5:00PM to allow the MSE to evaluate their system response to unpolarized light. I reduced the gas a few times to try to get rid of post-disruption fizzles. PG4 started the day at 18ms and ended up at 14ms. No other startup changes were made. I also tweaked the early current in seg 3 and 4 to try to get rid of some turnaround effects (programmed ip Scorecard ---------- tests 1 (beam-into-gas) duds 0 fizzles 4 plasmas 29 (1 early disruption) ======= == shots 34 |
| Session Leader Comments |
| Physics Operator Comments | |||
| Jan 23 2004 07:10:36:373AM | Steve Wolfe | Setting up for run 1030123 MP#375 Rotation and threshold vs SSEP SL: Rice PO: Wolfe PCS setup: loadfrom 1031125008 import seg1 from 1040122018 (.8MA, SNL) import seg4 from 1031125018 (.8MA, SSEP control) change tf from -147500 to -150000 copy wire 9 from wire 4 (clearin) and turn off gains call alg with zxa=.395; factor is 2.3e-5 call controller alg with zxa=.395, get rate 3.1688, common rate=3. build seg4: get a factor page for ic_ef4u load/clean - no warnings Filling in configuration /12-NOV-2003 08:00:23.00/ Cleaning PCS tree in /home/wolfe/pcs_scratch about to ask alcdata to copy /home/wolfe/pcs_scratch/pcs_model to /cmod/trees/models/pcs/pcs_model Load at 23-Jan-2004 07:10:00.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| Jan 23 2004 07:17:35:920AM | Steve Wolfe | Run Plan: --------- For all shots, RF program ramp from 0 to 3.0MW (or max available) between 0.9 and 1.5 sec. Start with 800kA LSN as on 1031125008 (2 shots) Switch to seg4 to run near DN like 1031125018 and adjust gaps per LaBombard, Hughes (? shots) Scan SSEP from -.01m to +.01m in 1mm steps (21 shots). Try to keep gaps constant by changing to upper xpoint reference on clearin once we get to SSEP>0. | |
| Jan 23 2004 09:10:05:873AM | 1040123001 | Steve Wolfe | shot#1: Seg2 from 1021125008 (snl 800kA, 8e19); rf ramp starting at 0.9sec plasma full length. No signals on the bus rogowski's. EFIT will fail. Run EFIT manually, but results will be suspect anyway. There is a big injection around .12sec, almost kills it. next shot: repeat, with the probe (and hopefully bus rogs) |
| Jan 23 2004 09:29:46:203AM | 1040123002 | Steve Wolfe | shot#2: Repeat with the scanning probe drop seg 1 field to 150000 (was left at 5.6T from yesterday) fizzle. Huge CII signal. Gas is way up. NO obvious reason. next shot: tweak gas, lower TF to 149 in seg1,2,4 (it's coming out 5.46 |
| Jan 23 2004 09:55:37:277AM | 1040123003 | Steve Wolfe | shot#3: pg4 from 18msec to 15ms, lower TF to 149kA in seg1,2,4 plasma, probe, hmode; Bt=5.43T looks good to me. next shot: go to DN (seg4) |
| Jan 23 2004 10:15:07:747AM | 1040123004 | Steve Wolfe | shot#4: go to DN (seg4 should look like 1031125018) plasma full length, h-mode at 1.3sec, ssep about -1mm the upper null referenced clearin is reading 6000 lower than the normal one. try putting the offset at 6000? next shot: raise zcur 2mm for jwhughes |
| Jan 23 2004 10:27:51:950AM | 1040123005 | Steve Wolfe | shot#5: raise zcur from -.01 to -.008 plasma full length, hmodce at 1.28sec, ssep -1mm->0 clearin signals agree, so the right offset for zxa=.395 is +6000 compared to 12,700 for the normal zxa. next shot: decrease ssep by .01m |
| Jan 23 2004 10:42:03:740AM | 1040123006 | Steve Wolfe | shot#6: decrease ssep by .01m to [-.011,-.012] plasma, disrupts at 1.67sec. tci feedback screwed up. No h-mode no d-port. ssep=-1.4cm according to efit. upper clearin ref is -11600 from nominal for this ssep. next shot: repeat, try for correct density |
| Jan 23 2004 11:00:57:307AM | 1040123007 | Steve Wolfe | shot#7: repeat, try for correct density disruption at 1.17sec. looks like abn injection? try again |
| Jan 23 2004 11:09:06:333AM | 1040123008 | Steve Wolfe | shot#8: repeat plasma, full length, hmode at 1.22sec next shot: ssep up 2mm |
| Jan 23 2004 11:24:11:443AM | 1040123009 | Steve Wolfe | shot#9: ssep up 2mm to [-.009,-.010] plasma full length, hmode at 1.29sec,ssep=-1cm next shot: decrease clearin by 2mm at .65sec, increase ssep by 2mm |
| Jan 23 2004 11:40:54:803AM | 1040123010 | Steve Wolfe | shot#10: decrease clearin by 2mm , to -.002 early,rcur by 1mm to .656,.655, increase ssep by 2mm to [-.007,-.008] plasma, full length, hmode at 1.25sec ssep is still at -1cm? Looks like the ssep didn't change. I think it's because I have another ssep on wire 12, and it found the wrong one? next shot: SSEP to [-.007,-.008] and zero wire 12 so I don't get confused. |
| Jan 23 2004 11:54:04:637AM | 1040123011 | Steve Wolfe | shot#11: SSEP to [-.007,-.008] and zero wire 12 so I don't get confused. plasma full length, hmode at 1.24sec, ssep=-8mm. next shot: ssep another 2mm positive |
| Jan 23 2004 12:14:28:270PM | 1040123012 | Steve Wolfe | shot#12: SSEP to [-.005,-.006] plasma full length, hmode at 1.30sec, ssep=-5.5mm wire 9 clearin is now at -5500 below wire 4 value (phys aout) next shot: another 2mm on SSEP |
| Jan 23 2004 12:22:45:330PM | 1040123013 | Steve Wolfe | shot#13: SSEP to [-.003,-.004] plasma full length, hmode at 1.23sec, ssep=-3.5mm next shot: increase Ip program at 0.1sec, ssep back to [-.001,-.002] |
| Jan 23 2004 12:38:31:253PM | 1040123014 | Steve Wolfe | shot#14: increase Ip program at 0.1sec, ssep back to [-.001,-.002] plasma full length, hmode at 1.20sec, ssep=-1mm. clearin errors match again. next shot: another 2mm on ssep, should go positive. |
| Jan 23 2004 12:53:33:273PM | 1040123015 | Steve Wolfe | shot#15:ssep to [.001,0]; no change to clearin yet. plasma full length, hmode at 1.34sec, ssep=+2mm Gap grew by 2mm next shot: change clearin alg to use zxa=+.395 |
| Jan 23 2004 01:12:09:940PM | 1040123016 | Steve Wolfe | shot#16:change clearin alg to use zxa=+.395, offset=6000 in predictor. ssep still at [.001,0.]; this may have a problem from .1 to .3sec plasma full length, hmode at 1.31sec, ssep=1.5 to 2mm Gaps look about the same as last time. The two clearin's differ by 3000, although the program and offset are the same. The difference must be in the hybrid internal offsets. I think that means I should change the offset to 9000. next shot: change offset to 9000 |
| Jan 23 2004 01:25:24:813PM | 1040123017 | Steve Wolfe | shot#17:change clearin alg to use zxa=+.395, offset=9000 in predictor. ssep still at [.001,0.] disrupted at 1.4sec, hmode at 1.25sec, left gap over 2cm; wrong way. No, the offset seems to have gone to zero, not to 9000. the wire 12 error is now 9000 greater than wire 4? It looks like it didn't take the change and put in zero instead. next shot: offset on clearin to 9000 |
| Jan 23 2004 01:34:47:733PM | 1040123018 | Steve Wolfe | shot#18:change clearin alg to use zxa=+.395, offset=9000 in predictor. and check it this time. ssep still at [.001,0.] plasma full length,hmode at 1.32sec, ssep=.2cm, leftgap=1.3cm next shot: ssep up another 2mm |
| Jan 23 2004 01:48:41:677PM | 1040123019 | Steve Wolfe | shot#19: ssep to [.003,.002] plasma to 1.6sec, tci feedback died again. over gassed it again. SSEP didn't seem to change; did I load it? next shot: try that again. Reload, just to be sure. |
| Jan 23 2004 02:02:13:133PM | 1040123020 | Steve Wolfe | shot#20: ssep to [.003,.002] fizzle. One disruption too many. next shot: repeat |
| Jan 23 2004 02:19:35:257PM | 1040123021 | Steve Wolfe | shot#21: ssep to [.003,.002] again plasma full length, No H-mode. D faults at 1.44sec ssep between 3.5 and 4mm next shot: Go on up another 2mm on ssep |
| Jan 23 2004 02:31:23:313PM | 1040123022 | Steve Wolfe | shot#22: ssep to [.005,.004] plasma full length, still no h-mode ssep=5mm next shot: up another 2mm on ssep |
| Jan 23 2004 02:48:28:107PM | 1040123023 | Steve Wolfe | shot#23: ssep to [.007,.006] RF will try 3MW flat program Distuption at 1.17sec ssep=6mm, but inner gap is down to 1cm? injection at 1.139 and a second big one at 1.17 next shot: increase clearin and another 2mm on ssep |
| Jan 23 2004 02:57:50:200PM | 1040123024 | Steve Wolfe | shot#24: ssep to [.009,.008] clearin increase by 2mm, rcur increase by 1mm fizzle. next shot: drop pg4 by 1msec |
| Jan 23 2004 03:17:42:223PM | 1040123025 | Steve Wolfe | shot#25:pg4 to 14msec, ssep at [.009,.008] clearin,rcur as on 24 plasma full length, no hmode. ssep=6.5mm, getting down to 1cm again. next shot: change clearin zxa to .35 |
| Jan 23 2004 03:28:55:437PM | 1040123026 | Steve Wolfe | shot#26:clearin zxa to .350 (offset=9000), and also controller to zxa=.350 ssep at [.009,.008] clearin,rcur as on 24 plasma full length, ssep=.7 to .9, left gap=1.4 next shot: decrease clearin by 1mm |
| Jan 23 2004 03:52:40:360PM | 1040123027 | Steve Wolfe | shot#27:clearin smaller by 1mm. ssep to [.01,.008] plasma, full length. No change in ssep time history. I'm going to have to change the SSEP algorithm to go any further. The problem seems to be that the SSEP controller is basically ZXU, so the upper xpoint is just coming down while the zxl is fixed. If I change that, I'll need to drop the ZXL gain as well, and maybe change the zxa reference again. next shot: Change SSEP controller to be orthog to ZXU, not ZXL |
| Jan 23 2004 03:59:36:750PM | 1040123028 | Steve Wolfe | shot#28: Change SSEP controller to be orthog to ZXU, not ZXL Early disruption. The ssep gain is on too soon. next shot: reload shot 27 and then change to upper null. |
| Jan 23 2004 04:11:14:307PM | 1040123029 | Steve Wolfe | shot#29: reload shot 27. Import seg 3 from 1031125030. Change tf to -149kA. Turn on seg3. load plasma full length, ssep>2cm next shot: increase zxl |
| Jan 23 2004 04:27:28:323PM | 1040123030 | Steve Wolfe | shot#30: increase zxl from -.04 to -.02 plasma disrupts at 1.25sec, ssep=+5mm, gaps aren't bad. Almost lost it on current rise at 0.1sec May have hit the nose. next shot: move xl out and back down. |
| Jan 23 2004 04:38:41:973PM | 1040123031 | Steve Wolfe | shot#31: zxl from -.02 to -.03; rxl from -.01 to 0.0 increase ip at .15 to -800000. fizzle. next shot: try that again |
| Jan 23 2004 04:55:07:753PM | 1040123032 | Steve Wolfe | shot#32: zxl from -.02 to -.03; rxl from -.01 to 0.0 increase ip at .15 to -800000. plasma full length, no hmode, ssep=10mm next shot: zxl to -.035 |
| Jan 23 2004 05:07:18:747PM | 1040123033 | Steve Wolfe | shot#33: zxl from -.03 to -.035 plasma full length. ssep around 1.4cm END OF PLASMA RUN next shot: Beam into gas only (MSE) |
| Jan 23 2004 05:16:40:667PM | 1040123034 | Steve Wolfe | shot#34: Beam into gas only (MSE) Load from 1040121015, f.d. on at 0.8 sec (was 0.08) BTOP only enabled. DNB at 0.7sec Got over 2mTorr of gas pressure, got the beam. END OF RUN |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:59:31:443AM | Plasma | Ok | |
| 2 | 09:22:35:247AM | Plasma | Ok | |
| 3 | 09:49:08:753AM | Plasma | Ok | |
| 4 | 10:03:21:120AM | Plasma | Ok | |
| 5 | 10:18:09:830AM | Plasma | Ok | |
| 6 | 10:32:43:400AM | Plasma | Ok | |
| 7 | 10:50:08:537AM | Plasma | Ok | |
| 8 | 11:03:59:323AM | Plasma | Ok | |
| 9 | 11:19:20:017AM | Plasma | Ok | |
| 10 | 11:33:21:973AM | Plasma | Ok | |
| 11 | 11:49:19:833AM | Plasma | Ok | |
| 12 | 12:02:42:403PM | Plasma | Ok | |
| 13 | 12:17:14:700PM | Plasma | Ok | |
| 14 | 12:33:08:890PM | Plasma | Ok | |
| 15 | 12:46:57:160PM | Plasma | Ok | |
| 16 | 01:01:36:557PM | Plasma | Ok | |
| 17 | 01:15:56:260PM | Plasma | Ok | |
| 18 | 01:30:17:650PM | Plasma | Ok | |
| 19 | 01:43:23:060PM | Plasma | Ok | |
| 20 | 01:59:10:903PM | Plasma | Ok | |
| 21 | 02:12:56:990PM | Plasma | Ok | |
| 22 | 02:26:56:650PM | Plasma | Ok | |
| 23 | 02:40:10:250PM | Plasma | Ok | |
| 24 | 02:54:16:563PM | Plasma | Ok | |
| 25 | 03:09:00:990PM | Plasma | Ok | |
| 26 | 03:23:22:773PM | Plasma | Ok | |
| 27 | 03:37:35:717PM | Plasma | Ok | |
| 28 | 03:54:31:530PM | Plasma | Ok | |
| 29 | 04:06:51:770PM | Plasma | Ok | |
| 30 | 04:21:16:883PM | Plasma | Ok | |
| 31 | 04:35:31:243PM | Plasma | Ok | |
| 32 | 04:49:16:220PM | Plasma | Ok | |
| 33 | 05:03:44:097PM | Plasma | Ok | |
| 34 | 05:13:16:453PM | Test | Ok | |
| 35 | 03:31:27:243PM | Test | Bad | |