Miniproposals

Miniproposal: 377 Date Filed: 11/26/2003 Title: Energy confinement in double-null discharges First Author: Dale Meade Session Leader: Dale Meade (shots 1-30) Session Leader: Earl Marmar (shots 1-30)

Engineering Operator Run Comment

MP#377 Energy Confinement in DN discharges

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:35:430PM

Author: Dale Meade

Run Summary 1031211 Physics Operator: Steve Wolfe Session Co-Leaders: Dale Meade and Earl Marmar MP 377 Energy Confinement in SN vs DN Day 1 Plasma Current Scan General comments - obtained about 17 useful data shots had difficulty with RF faulting in first sequence of 0.8 MA shots, so we decided to go to 1.0 and 1.2 MA edge neutral pressure (F-side) was on the high side at 0.8 MA, target nl_04=0.9e20 J-port was much happier at the higher currents ICRF system was generally reliable later with powers ~ 4.5 MW some lack of reproducibility in radiated power some early disruptions in several shots, possibly due to SSEP control, but see physop summary for details Lost about 2 hours total from first a problem with alcserv2, and then a water leak on one of the ICRF transmitters Results Medium density, n/n_G ~ 0.4 during H-mode periods plasmas had multiple H-Modes typically had monotonically increasing radiation after each L-H transition Completed 1 MA LSN/DN comparisons - scanned SSEP(-1 cm to +0.4 cm) Compared H89 for LSN and DN at first H-Mode - H ~ 1.3 for both Completed 1.2 MA SNl/DN comparisons Compared H89 for LSN and DN at first H-Mode - H89 ~ 1.2 in DN, perhaps 10% lower in LSN Follow-up Issues investigate possible causes of irreproducibility - radiation? It appears the boronization had almost completely worn off (Rice reports Mo was up about a factor of 2 compared to 1031209. Will want to revisit these discharges on the first or second day after boronization

Physics Operator Summaries

Entered: Jul 7 2004 04:37:20:020PM

Author: Steve Wolfe

Physics Operator Summary for Thursday, Dec 11, 2003 MP#377 Energy Confinement in DN Discharges SL: Meade,Marmar PO: Wolfe EO: Engineering Setup and Run Plan: ----------------------------------------- ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Bake at 60 C overnight as well. Run begins at 09:00 and ends at 17:00 Power systems the same as on 1031210001 (if Bill has changed the IOC in EF4 supply, then raise EF4 PLC limit from 9->10kA) A-coils should be hooked up (+Dtop -Dbot -Jtop +Jbot), and the power supply should be enabled. C-coil PLC limit settings should be set at 600 volts and 3 kA. Gas 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) Transmitters 1,2,3 and 4 in RUN_ON by 08:00 Gate valve permissives for the usual suspects (ECE, VUV, DNB) assuming no vacuum issues. ------------------------------------------------------------------------- PCS Setup: Load from 1031125018 import seg1 startup from 1031210033 Turn on seg2 and turn off seg4 In seg2, set nl04 to 0.9e19 change RXU from -.02 to -.04 leave ZXU at +.03 (contrary to what I said in the run plan). In seg3, copy nl04 from seg2 RXL is presently at -.01; leave it for now In seg4, copy nl04 from seg2; extend nl04 gain to 2sec copy pg3 voltage waveform from seg2 Do a build_all- get a timestamp message on p01 in seg1 move it 1msec and rebuild Turn on seg3 and build_all -- all ok Turn on seg4 and build_all -- all ok Back to seg2 and build again, just for luck. Save as /home/wolfe/pcs_trees/pcs_1031211000 ------------------------------------------------------------------------- Run Plan: We will be concentrating on DN equilibria, but also doing some SNL and perhaps some SNU cases for comparison. Starting point for the DN is segment 4 of 1031125018, with nl04 changed to 0.9e20. For the lower and upper null cases we could use seg 2 and 3 in the same shot, but these are considerably lower triangularity. Therefore, we will tweak up these cases to higher triangularity, like 0.5. Based on Tuesday's shots, RXU~-.04, and ZXU~+.04 should be about right. The plan is to start with SNL comparison shots, then DN, then SNU. The upper nulls could be eliminated if we're pressed for time. We'll go through the sequence at each of three currents. At least for the first current we will need to veify the magnetic balance in DN, cross-checking with John's rotation signature. 1. 0.8MA SNL nl04=0.9e20, 4.5MW (or 5 if reliable) [2 shots] 2. 0.8MA DN " " [5 shots]; check balance 3. 0.8MA SNU " " [2 shots] 4. Repeat 1,2,3 for 2 shots each at 1.0MA [6shots] 5. Repeat 1,2,3 for 2 shots each at 1.2MA [6shots] If we get through this set before the end of the run, we can start on the second day's program from the MP, a density scan at 1MA in each configuration. Results: ---------- A difficult run, but we did get comparison discharges in DN and SNB at 1MA and 1.2MA. The answer seems to be that the DN were slightly higher confinement, although none of the H factors today were very good. The RF was performing quite well at the 4.5MW level, once we lowered the target density enough to get the neutral pressure below 0.2mTorr, which seems to be the magic number for J-port. Startup was quite reliable, with only one "legitimate" fizzle all day. The first 6 shots were spent trying to get a satisfactory SNB discharge without RF faults. J apparently faults when the f-side neutral pressure goes over about 0.3mTorr, and we were ending up at 0.4mTorr even after dropping the nl04 demand to 0.8e20. Finally, we punted on the 800kA case and went to 1MA, for which the neutral pressure is lower at the same nl04. Shots 7-20 were DN at 1MA. We varied the ssep from about -2mm to +4mm, settling on a nominal ~+1mm as begin the balanced case. An unpleasantly large fraction of these disrupted very early, between .2 and .4 sec. It turns out that the SSEP control gain of 6, which worked fine for earlier 800kA shots, as on 1031125, was coming in too early and causing a big thrash on the ef1u and ef2u currents, which led to a vertical instability. I eventually solved this by dropping the initial gain from 6 to 1, raising it back to 6 only after .6sec. Most of the DN shots that made it through flattop disrupted in rampdown. Surprisingly, I found at shot #18 that leaving the SSEP gain at 6 through 2sec fixed the rampdown disruption, even though the Ef2's went to zero earlier. Most of the DN discharges were ramped down starting at 1.3sec, since we only had the RF on until 1.1sec anyway. Shot#21 was a repeat of #6, lower single null at 1MA. There was a data system hang during store, and some data were lost, but we saw enough to know that Wmhd was essentially the same as before (~145kJ). It turned out that alcserv2 had hung and needed a couple of reboots and a kick in the swap file from twf. There is some suspicion that there is a hardware problem with the swap disk. We ended up losing about an hour; we did get in about 15minutes of ecdc while we waited. Shot #22, taken before the computer was completely (?) fixed, was a dud on which we got no data. It appeared from plc records that the pulsed gas didn't go, although the power supplies did. Shot #23, which was attempted at least twice, was a no power data system cycle (with gas) which was ultimately successful. Shot#24 was SNB at 1.2MA. After shot#24, the overflow valve on FMIT#2 stuck open and dumped a lot of DI water, causing a low water alarm. This caused another half hour or so delay. Shot#25-27 were DN at 1.2MA. Shot #28 was a fizzle; for unexplained reasons the pressure at breakdown jumped up from the previous ahot, and the CII signal was up to .01 from <.002. Shots 29-30 were back to lower single null at 1.2MA. All the shots had multiple H-modes, apparently due to high radiation. The H-factors were all low (<1.5, many barely above 1). We may have done in the boronization already, in which case Catherine is proabably in for another bad day tomorrow. The DN cases had marginally higher stored energy for the same power as the SN cases. The shapes were reasonably matched in triangularity, and had very close to the same q for the same current. This seems to be a result, although it would be better if the H-factors weren't so abysmal. Scorecard --------- tests 1 duds 1 (no gas? Also no data) fizzles 1 plasmas 27 (4 short disruptions) ====== === shots 30

Session Leader Comments
Dec 11 2003 08:45:49:380AM		Dale Meade	Sign in by Session Co-Leader Dale Meade
Dec 11 2003 09:07:37:177AM		Earl Marmar	MP 377 Energy confinement comparisons between single and double null SL: Meade/Marmar PO: Wolfe
Dec 11 2003 09:09:37:877AM	1031211001	Earl Marmar	plasma LSN nl_04 target about 0.8e20 RF 4.5 MW but some faulting early H89 ~ 1.16 during staeady RF W = .105 MJ
Dec 11 2003 09:10:24:267AM	1031211001	Dale Meade	Decent first shot. SNL, delta-L = 0.6, delta-U = 0.4, H89 = 1.2, W = 100 kJ, Prf = 4.4MW
Dec 11 2003 09:21:48:280AM	1031211002	Earl Marmar	increase target nl_04 to 0.9e20 plasma 4.5 MW RF but many trips on each antenna outer gap is about 2 cm; should be reduced
Dec 11 2003 09:24:00:637AM	1031211003	Dale Meade	lots of Rf faulting, H89 = 1.2
Dec 11 2003 09:35:03:587AM	1031211003	Dale Meade	right gap reduced from 2 cm to 1 cm, intial confinement looked good - H89 came up to 1.4 then Rf faulted
Dec 11 2003 09:45:50:587AM	1031211003	Earl Marmar	plasma; more rf faulting
Dec 11 2003 09:44:18:637AM	1031211004	Dale Meade	not good, neutral pressure thought to be too high
Dec 11 2003 09:46:37:023AM	1031211004	Earl Marmar	repeat; j-port would not run -- edge neutral pressure too high
Dec 11 2003 10:06:50:507AM	1031211005	Dale Meade	increased Ip to 1 MA, decreased density, RF faulting reduced Prf = 4MW,
Dec 11 2003 10:14:16:387AM	1031211005	Earl Marmar	go to 1MA, nl_04 target = 0.8e20; LSN plasma better RF W=137 kJ; H89 ~ 1.3
Dec 11 2003 10:16:58:117AM	1031211006	Earl Marmar	repeat; steady RF, 4.7 MW H89 ~ 1.3 (RF abs frac = 0.8 assumed)
Dec 11 2003 10:21:16:907AM	1031211006	Dale Meade	SNL shot, 1 MA, RF steady at 4.8 MW, confinement Ok
Dec 11 2003 10:27:15:383AM	1031211007	Earl Marmar	double null; ssep very close to 0 RF ~4 MW and tripping Wmax = 135 kJ; outer gap around 2cm; delta_upper ~ 0.5
Dec 11 2003 10:30:07:643AM	1031211007	Dale Meade	first DN shot, delta-U = 0.57, delta-L = 1 MA, H89 = 1.1, SSEP = 0.0, outer gap = 1.9 cm, disruption during ramp down
Dec 11 2003 10:43:14:280AM	1031211008	Earl Marmar	DN, steady RF, rapid L-H-L transitions Wmax = 147 kJ H_89 < 1.3
Dec 11 2003 10:44:41:700AM	1031211008	Dale Meade	DN, reduced outer gap to 1 cm, SSEP = -0.15 cm, delta-U = 0.56, delta-L = 0.53, H89 = 1.32, PRF = 4.4 MW, disruption during ramp down
Dec 11 2003 10:47:48:273AM	1031211009	Earl Marmar	early disruption
Dec 11 2003 11:03:57:310AM	1031211009	Dale Meade	Early termination @ 0.18 s, pulse programmed to move plasma up about 1 cm relative to previous shot
Dec 11 2003 11:03:26:607AM	1031211010	Earl Marmar	early disruption
Dec 11 2003 11:05:21:527AM	1031211010	Dale Meade	Early termination @ 0.2 s, similar to shot 009
Dec 11 2003 11:30:06:847AM	1031211011	Dale Meade	Good DN shot, SSEP = -0.07 cm , delta U = 0.65, delta-L = 0.56, H89=1.38, right gap = 1cm, left gap = 2 cm, q95 = 4.1, Prf = 4.7 MW
Dec 11 2003 11:33:44:453AM	1031211011	Earl Marmar	DN, plasma SSEP ~ 0.0 cm Wmax = 154 kJ, Prf = 4.7 MW and steady high Prad H89 ~ 1.35
Dec 11 2003 11:43:56:593AM	1031211012	Dale Meade	Good DN shot, SSEP = 0.20 cm , delta U = 0.68, delta-L = 0.47, H89=1.21, right gap = 1cm, left gap = 2 cm, q95 = 3.9, Prf = 4.66 MW
Dec 11 2003 11:47:34:947AM	1031211012	Earl Marmar	DN plasma SSEP = +0.2 cm Wmax = 157 kJ, 4.8 MW rf, H_89 ~ 1.3 for dW/dt = 0 time on first H-mode
Dec 11 2003 11:52:00:517AM	1031211013	Earl Marmar	early disruption
Dec 11 2003 11:56:51:900AM	1031211013	Dale Meade	Early termination, programmed to move plasma up 2 mm
Dec 11 2003 12:01:11:923PM	1031211014	Earl Marmar	early disruption
Dec 11 2003 12:25:20:030PM	1031211015	Dale Meade	good DN, SSEP = 0.42, delta-U = 0.67, delta-L = 0.41, H89 = 1.32, PRF = 4.7 MW, q95 = 3.6
Dec 11 2003 12:54:15:017PM	1031211015	Earl Marmar	close to upper null, plasma SSEP = +0.4 Wmax=149 kJ, Prf=4.7 MW, lots of Prad H_89 ~ 1.2
Dec 11 2003 12:39:56:820PM	1031211016	Dale Meade	good DN, SSEP = 0.21, delta-U = 0.63, delta-L = 0.43, H89 = 1.32, PRF = 4.7 MW, q95 = 3.85
Dec 11 2003 12:57:32:510PM	1031211016	Earl Marmar	DN, plasma SSEP = 0.2 cm Prf = 4.7 and steady Wmax = 168 kJ, H_89 ~ 1.4
Dec 11 2003 01:03:42:610PM	1031211017	Earl Marmar	DN, slightly higher target density Early rf trip, looked promising up to then
Dec 11 2003 01:07:20:463PM	1031211018	Dale Meade	good DN, SSEP = 0.24, H89 = 1.61, SSEP = 0.24, PRF = 4.24 MW
Dec 11 2003 01:08:55:633PM	1031211018	Earl Marmar	DN, plasma SSEP = 0.2 Wmax = 167kJ, H ~ 1.5
Dec 11 2003 01:20:32:663PM	1031211019	Earl Marmar	DN, plasma early J- trip, then rapid H-L-H-L... transitions. H_89 ~ 1.0 Wmax = 125 kJ
Dec 11 2003 02:02:08:810PM	1031211020	Earl Marmar	DN, SSEP = -.1 Wmax = 155 kJ, Prf = 4.7, H89 =1.2
Dec 11 2003 01:53:36:700PM	1031211021	Dale Meade	good LSN, 1 MA H89 = 1.34, , PRF = 4.69 MW
Dec 11 2003 01:57:12:277PM	1031211021	Earl Marmar	LSN plasma, Prf = 4.7 MW and steady Wmax = 145, H_89 1.35 lost many signals due to alcserv2 crash after the shot
Dec 11 2003 02:58:47:583PM	1031211021	Earl Marmar	after shot 21, ECDC for 16 minutes (D2, 2e-4 torr guage) while waiting for computers to be fixed.
Dec 11 2003 03:25:31:610PM	1031211024	Dale Meade	LSN, 1.2 MA, H89 = 1.12, q95 = 3.45, delta_u = 0.46, delta-l = 0.59, PRF = 4.6 MW
Dec 11 2003 03:44:10:880PM	1031211024	Earl Marmar	LSN, 1.2 MA, Wmax=164 kJ, Prf=4.8 Mw and steady, H89 = 1.17
Dec 11 2003 04:14:49:340PM	1031211025	Dale Meade	DN, 1.2 MA, H89 = 1.06, q95 = 3.45, ssep = -0.03 cm, Prf = 4.3 MW, RF dropped out later
Dec 11 2003 04:17:05:013PM	1031211025	Earl Marmar	DN, SSEP = -.05 1.2 MA, Wmax=159 kJ, Prf ~ 4. MW, H89 = 1.05
Dec 11 2003 04:24:38:033PM	1031211026	Dale Meade	DN, 1.2 MA, H89 = 1.27, q95 = 3.43, ssep = -0.03 cm, Prf = 4.5 MW,
Dec 11 2003 04:28:28:567PM	1031211026	Earl Marmar	DN, 1.2 MA Wmax=170 kJ, Prf = 4.7 H89 = 1.23 at first dw/dt=0
Dec 11 2003 04:37:01:833PM	1031211027	Earl Marmar	DN, SSEP = -.1, Wmax = 181 kJ, Prf = 4.7 MW and steady H_89 = 1.22 at first dW/dt=0
Dec 11 2003 04:40:52:430PM	1031211027	Dale Meade	repeat of 1031211026 to check reproducibility , ssep = =0.02 H89 = 1.19, PRF = 4.3 MW, steady
Dec 11 2003 04:47:50:933PM	1031211028	Dale Meade	repeat of 27, first legitimate fizzle
Dec 11 2003 04:47:57:090PM	1031211028	Earl Marmar	fizzle
Dec 11 2003 05:03:30:767PM	1031211029	Dale Meade	LSN, 1.2 MA, H89 = 1.01, q95 = 3.4, Prf = 4.5 MW, steady
Dec 11 2003 05:21:45:570PM	1031211029	Earl Marmar	LSN, 1.2 MA, Wmax = 151 kJ, Prf = 4.7 MW and steady H89 = 1.05 when dW/dt =0
Dec 11 2003 05:15:48:333PM	1031211030	Dale Meade	LSN, 1.2 MA, H89 = 1.05, q95 = 3.4, Prf = 4.65 MW, early fault, then steady
Dec 11 2003 05:36:39:153PM	1031211030	Earl Marmar	LSN, 1.2 MA, Wmax = 148 kJ, Prf = 4.7 Mw, 1 trip, last H-mode slightly better than others H89 ~ 1.03 for dW/dt=0 on last H-mode

Physics Operator Comments
Dec 10 2003 05:49:24:073PM		Steve Wolfe	Setting up PCS for tomorrow's run: Load from 1031125018 import seg1 startup from 1031210033 Turn on seg2 and turn off seg4 In seg2, set nl04 to 0.9e19 change RXU from -.02 to -.04 leave ZXU at +.03 (contrary to what I said in the run plan). In seg3, copy nl04 from seg2 RXL is presently at -.01; leave it for now In seg4, copy nl04 from seg2; extend nl04 gain to 2sec copy pg3 voltage waveform from seg2 Do a build_all- get a timestamp message on p01 in seg1 move it 1msec and rebuild Turn on seg3 and build_all -- all ok Turn on seg4 and build_all -- all ok Back to seg2 and build again, just for luck. Save as /home/wolfe/pcs_trees/pcs_1031211000
Dec 10 2003 06:26:43:023PM		Steve Wolfe	Go ahead and load it into model as well, so it will be ready to go if I'm late getting in. Filling in configuration /12-NOV-2003 08:00:23.00/ Cleaning PCS tree in /home/wolfe/pcs_scratch about to ask alcserv2 to copy /home/wolfe/pcs_scratch/pcs_model to /cmod/trees/models/pcs/pcs_model Load at 10-Dec-2003 18:26:16.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done
Dec 11 2003 08:44:54:150AM		Steve Wolfe	Reload PCS before run, just for fun. Only change was title of seg4 to say DN instead of SN Seg2 (SNL) is on for shot#1
Dec 11 2003 09:04:26:463AM	1031211001	Steve Wolfe	shot#1: plasma full length 105kJ, delta_u=0.4 and rising late RF=4.6MW, some faulting next shot:decrease lower triang, increase upper early
Dec 11 2003 09:15:57:647AM	1031211002	Steve Wolfe	shot#2: decrease lower triang, increase upper early,raise nl04 from 0.9 to 1.0e20 RXL out by 1cm, RXU in by 1cm (to -.05) before 1sec plasma full length. RF still faulting. outer gap may be too big next shot: decrease outer gap by 8mm
Dec 11 2003 09:32:45:200AM	1031211003	Steve Wolfe	shot#3: decrease outer gap by 8mm (rcur out by 4mm) tweak rxu a little more to flatten delta_u plasma full length. outer gap down to 9mm, delta_u ~.45 RF unhappy. next shot: no pcs changes
Dec 11 2003 09:42:25:140AM	1031211004	Steve Wolfe	shot#4: no pcs changes plasma full length. Wookie is complaining about f-side pressure being too high. next shot: drop nl4 to 0.8, raise ip to 1MA
Dec 11 2003 09:57:13:507AM	1031211005	Steve Wolfe	shot#5: drop nl4 to 0.8, raise ip to 1MA; also, drop early pg3 from 70V to 40V. plasma full length, 135kJ, 3.9MW, J stayed on, some D&E faults, but much better. f-side pressure down to .15mTorr (from 4) next shot: repeat for more power.
Dec 11 2003 10:07:56:960AM	1031211006	Steve Wolfe	shot#6:repeat for more power. plasma full length, RF stays on at 4.8MW 150kJ next shot: go to DN
Dec 11 2003 10:25:50:400AM	1031211007	Steve Wolfe	shot#7:copy ip and nl4 from seg2 to seg4. turn on seg4 plasma disrupted in rampdown at 1.65sec. outer gap was up to 2cm; I forgot to change that ssep averages ~-.1cm EF2U goes to zero before the disruption. next shot: decrease outer gap, shorten shot.
Dec 11 2003 10:36:51:163AM	1031211008	Steve Wolfe	shot#8: decrease outer gap, (rcur out by 4mm) shorten shot. plasma, disrupts at 1.56, around 500kA. 6 h-modes, rf stays on. outer gap starts at 7mm, moves to 11 during rf next shot: increase inner gap from 1.4 to 2.cm
Dec 11 2003 10:58:03:023AM	1031211009	Steve Wolfe	shot#9: increase clearin by 6mm, rcur by 3mm zcur by 8mm (for edge TS); move clearin in starting 1.3sec short plasma, disrupts at 0.2sec Big injection at 0.18sec. next shot: move rcur out a little earlier, .2sec
Dec 11 2003 11:07:26:680AM	1031211010	Steve Wolfe	shot#10: move rcur out a little earlier, .2sec Same early disruption. next shot: delay zcur rise to .35 sec
Dec 11 2003 11:22:26:047AM	1031211011	Steve Wolfe	shot#11: delay zcur rise to .35 sec, bring rcur back in. raise pg4 from 15 to 17msec (there were some runaways on 10) plasma to 1.56sec, ssep slightly negative (-.1 to -.2) gets to 153kJ in first h-mode. next shot: add another msec to pg4 move ssep +2mm
Dec 11 2003 11:37:23:010AM	1031211012	Steve Wolfe	shot#12: add another msec to pg4 move ssep +2mm; keep IC_EF4 up after 1.5sec plasma to 1.55sec, ef2u still going to zero. It also goes to zero between .2 and .38; am I doing something bad to clearin? 158kJ, ssep=+2mm next shot: 2mm more +ve
Dec 11 2003 11:52:33:767AM	1031211013	Steve Wolfe	shot#13: 2mm more +ve, change ef2byef4 from -2000 to -3000 another short disruption at .2sec; it goes upper null very early next shot: reload shot12 and make the ssep change only.
Dec 11 2003 12:09:40:897PM	1031211014	Steve Wolfe	shot#14: reload shot12 and make the ssep change only. ssep:[.12,.001]->[.20,.003] [1.7,0]->[1.3,.002] [[3.0,0]->[2.0,0] Didn't put back the gas tweak. same thing! next shot: delay zcur step, ssep and zxu gains
Dec 11 2003 12:23:55:437PM	1031211015	Steve Wolfe	shot#15: delay zcur step to .4, ssep and zxu gains to .35 plasma to 1.55sec. It's thrashing vertically and railing ef1u and ef2u between .35 and .52 SSEP starts out with an error of -15000A-m, and rings a few times I need to drop that gain. next shot: gain step on ssep: [.35,2],[.6,6] . drop ssep by 2mm
Dec 11 2003 12:33:58:030PM	1031211016	Steve Wolfe	shot#16: gain step on ssep: [.35,2],[.6,6] . drop ssep by 2mm plasma to 1.55 again, thrash is suppressed but still present ef2u almost rails at 0.4sec next shot: raise nl4 from 0.8 to 0.9e20
Dec 11 2003 12:51:02:880PM	1031211017	Steve Wolfe	shot#17: raise nl4 from 0.8 to 0.9e20, delay rf by 100msec Drop initial ssep gain to 1 and also put 1 from 1.3 to 2 plasma to 1.4sec, so the late gain switch was the wrong thing. one short h-mode. then l-mode. next shot: put ssep gain at 6 through 2sec
Dec 11 2003 01:04:39:250PM	1031211018	Steve Wolfe	shot#18: put ssep gain at 6 through 2sec, no other changes. plasma full length. 160+ kJ next shot: down by 2mm again on ssep.
Dec 11 2003 01:24:40:110PM	1031211019	Steve Wolfe	shot#19: down by 2mm again on ssep plasma full length modulated h-modes, stored energy down to ~120kJ.
Dec 11 2003 01:47:51:760PM	1031211020	Steve Wolfe	shot#20: repeat plasma full length. Gets to 150kJ on the first h-mode, then never recovers. Note that ef2u is still going to zero current in rampdown, but it isn't disrupting. next shot: back to shot 6.
Dec 11 2003 01:47:29:447PM	1031211021	Steve Wolfe	shot#21: back to shot 6 SNL): turn seg2 on, increase clearin by 5mm, rcur by 2.5mm to tweak the inner gap. plasma full length 146 kJ Data system problem in store. Tom is looking at it. next shot: raise Ip to 1.2MA
Dec 11 2003 02:12:20:737PM	1031211021	Steve Wolfe	shot#22: raise Ip to 1.2MA,raise nl4 to 0.9e20 Data hang in init, on the dpcs. Tom said to bypass IGOR and go. Dud (on the tv). No data. Apparently no gas valves went, but all power supplies fired. Tom is still working on it.
Dec 11 2003 02:17:21:927PM	1031211021	Steve Wolfe	shot#23 will be a no power shot. Data system check only
Dec 11 2003 02:21:29:100PM	1031211021	Steve Wolfe	shot#23: No good. Still no action.
Dec 11 2003 02:38:46:187PM	1031211021	Steve Wolfe	We are experiencing a delay while Tom and Josh deal with a computer problem. ECDC is being started, and there will be a cell access once the O2 alarms go off. No estimated uptime.
Dec 11 2003 03:07:28:587PM	1031211023	Steve Wolfe	Shot# 23 will be a no-power cycle. Seemed to go ok. next shot: Tru for 1.2MA, 0.9e20
Dec 11 2003 03:19:09:513PM	1031211024	Steve Wolfe	Shot# 24 Try for 1.2MA, 0.9e20 plasma full length 164kJ on first H-mode. 4.6MW next shot: Back to DN
Dec 11 2003 03:40:50:037PM	1031211024	Steve Wolfe	There is a delay due to a low water alarm in the DI water. This was caused by the overflow valve in fmit#2 sticking open, dumping ~100 gal of water out of the system.
Dec 11 2003 04:17:32:873PM	1031211025	Steve Wolfe	Shot# 25: Back to DN, Ip to 1.2MA in seg4 and turn on seg4. plasma to full length. Almost lost it current rise. SSEp around -1mm. 160kJ. next shot: repeat
Dec 11 2003 04:27:01:063PM	1031211026	Steve Wolfe	Shot# 26: No pcs changes plasma full length. Current rise is ok this time. 170kJ, ssep looks pretty close to zero. next shot: repeat
Dec 11 2003 04:35:58:537PM	1031211027	Steve Wolfe	Shot# 27: No pcs changes plasma full length 180kJ, rf did not have the early fault. next shot: one more repeat DN case
Dec 11 2003 04:55:38:700PM	1031211028	Steve Wolfe	Shot# 28: No pcs changes fizzle. gas seems to be way up. CII up to .01 next shot: back to lower null for the last shot.
Dec 11 2003 04:59:41:310PM	1031211029	Steve Wolfe	Shot# 29: back to lower null for the last shot (seg2 on, seg4 off) drop pg4 from 18->17msec plasma full length rf stays on, 150kJ next shot: one more SNB
Dec 11 2003 05:13:38:350PM	1031211030	Steve Wolfe	Shot# 30: one more SNB. No pcs changes plasma full length. early rf fault. Last h-mode has ~150kJ. END OF RUN.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:56:18:850AM	Plasma	Ok
2	09:10:19:203AM	Plasma	Ok
3	09:23:21:010AM	Plasma	Ok
4	09:37:21:973AM	Plasma	Ok
5	09:50:16:203AM	Plasma	Ok
6	10:03:15:357AM	Plasma	Ok
7	10:15:47:040AM	Plasma	Ok
8	10:31:22:780AM	Plasma	Ok
9	10:45:40:527AM	Plasma	Ok
10	10:59:58:097AM	Plasma	Ok
11	11:12:43:233AM	Plasma	Ok
12	11:27:49:400AM	Plasma	Ok
13	11:44:19:390AM	Plasma	Ok
14	11:58:39:163AM	Plasma	Ok
15	12:14:05:233PM	Plasma	Ok
16	12:28:23:337PM	Plasma	Ok
17	12:42:22:080PM	Plasma	Ok
18	12:55:51:500PM	Plasma	Ok
19	01:08:38:870PM	Plasma	Ok
20	01:21:13:960PM	Plasma	Ok
21	01:34:36:813PM	Plasma	Ok
23	02:58:29:270PM	Test	Ok
24	03:14:20:900PM	Plasma	Ok
25	04:05:18:680PM	Plasma	Ok
26	04:18:14:263PM	Plasma	Ok
27	04:30:41:237PM	Plasma	Ok
28	04:43:17:727PM	Plasma	Ok
29	04:55:37:043PM	Plasma	Ok
30	05:09:08:160PM	Plasma	Ok