| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Brian Labombard |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Andy Pfeiffer,Bill Cochran,Bill Byford,Gary Dekow |
| Engineering Operator Run Comment |
| automatically entered by signon - please replace with real comment |
| Session Leader Plans |
| Entered: Jul 9 2010 08:41:13:013AM |
| Author: Brian Labombard |
| Run Plan for 1100709
MP#557 - Commissioning of new divertor heat flux diagnostics MP#570 - Boundary layer heat transport experiments in L-mode plasmas Goal We will revisit run#1 in Table 1 of MP#570 - LSN, ohmic L-mode plasmas, 5.4 tesla, 0.8 and 0.54 MA, density scans. As this will be the first attempt to get the heat flux diagnostics on-line, it may turn out to be a non-physics diagnostics commissioning run. Anyway, the primary foci will be: (1) Make use of the new array of Langmuir probes in the J-divertor module, combined with the refurbished sensors and IR to measure heat flux profiles and associated sheath heat transfer coefficients. Initial indications are that these new Langmuir probes, which are at the top of the ramped tiles, do not suffer from field line shadowing effects. (2) Use scanning probes and edge Thomson to map out the 'upstream' pressure profiles, and their mapping to the heat flux footprints. (3) Scan plasma current and edge collisionality to map out edge the 'critical pressure gradient' behavior that was seen before (i.e., a canonical alpha_mhd value ~ 1 at LCFS), with the idea of connecting these observations to the heat flux footprint scaling. (4) Use GPI to explore behavior of boundary layer turbulence as parameters are varied. Setup NINJA should be filled to 8 PSI D2. Program gas to hit plasma at 1.1 s. Reload shot#1090923020. This was a 0.8 MA, 5.4 tesla, NL04 ~ 0.5 discharge with optimized strike point sweep and inner/outer gaps. Set ASP, FSP and WASP scanning probes to fire at 0.6, 0.95 and 1.3 seconds No ICRF or LHRF. A. LSN, 5.4 tesla, 0.8 MA NL04~ 0.4, 0.6, 0.8, 1.0, 1.2, 1.4, 1.6e20 Two shots at each density, probes scanning to resolve shear layer. B. LSN, 5.4 tesla, 0.54 MA Use Steve Wolfe�??s cross-over glitch controller to mitigate jogs in outer boundary shape. NL04~ 0.27, 0.4, 0.54, 0.68, 0.81, 0.95, 1.1e20 Two shots at each density, probes scanning to resolve shear layer. |
| Physics Operators Plans |
| Entered: Jul 8 2010 03:31:55:947PM |
| Author: Steve Wolfe |
| Physop Plan and Engineering Setup for Friday, July 9, 2010
MP##570 - Boundary layer heat transport experiments in L-mode plasmas SL: LaBombard PO: wolfe ----------------- Engineering Setup ----------------- ------------------------------ Overnight ECDC Parameters NOTE: Non-Standard second setup for morning ------------------------------ gas and pressure: D2 at 2e-4 Torr sweep: 44/45/103 cm scan: 20/120 s ** Followed by ** He at 5e-5 Torr for one hour sweep: 44/45/103 cm scan: 20/120 s --------------------------------------- Run begins at 09:00 and ends at 17:00 Cryopump requested starting with first shot Power systems as on: 1090923020 Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid 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 as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill NINJA with 8 psi D2 Enabled Enable gatevalves and shutters: ECE, VUV, HiREX Sr, Z-bolo, B-spectrometer Torvac gatevalve toggle (yes/no): no Boronization(yes/no): no Overnight ECDC (yes/no): YES (see setup at top of entry) ICRF(yes/no): no LH(yes/no): no Cryopump (yes/no): YES Vessel temperature: 35/35/35 Physop Plan: ------------- Start from seg2 from 1090923020, 800kA, 5.4T, nl04=0.5e20 with swept strike and x-point Since this shot was from just before f15 died, I'll need to recalculate the magnetics predictors. Use startup from Wednesday with the cryopump on. Some tweaking will probably be required to try to keep the runaways under control. A. Scan nl04 from 0.4 to 1.6e20, in steps of 0.2e20, taking 2shots per density NINJA will be puffing, at least for the higher density cases. B. Decrease Ip to 540ka, turn on dpcs oh1_crossover routine to ameliorate crossover glitch. Scan nl04 from 0.27 to 1.1e20, as per SL plan, again at 2 shots per density. Probably skip some steps to get done in one day? |
| Session Leader Summaries |
| Entered: Jul 11 2010 09:28:23:330PM |
| Author: Brian Labombard |
| Run Summary for 1100709
MP#570 -- "Boundary layer heat transport experiments in L-mode plasmas" MP#557 -- "Commissioning of new divertor heat flux diagnostics" It was a bumpy ride today, with both expected and unexpected bumps in the road. Things started off with a fast-start. By shot#2 we already had the strike point sweep programming that we wanted in the desired 0.8 MA, 5.4 tesla, NL04 ~ 0.5ish discharge (thanks Steve Wolfe). And immediately, data from the new Langmuir probes and surface thermocouples at the top of the ramped tiles yielded some very promising results. Parallel heat fluxes computed from both diagnostics appeared to overlay, clearly mapping out the heat flux footprint in these low-power ohmic discharges -- very nice. But, the scanning probes (WASP, ASP, FSP) needed at lot more care and attention than we wanted to admit. They had not yet been scanned to the separatrix in any discharges up to now and needed to be poked many times to clean up. We kept banging on the same discharge all the way to shot#9 when finally the ASP appeared to be clean up well enough (but not great) to proceed to the next density point (NL04 ~ 0.67). Yunxing reported good news that the edge Thomson system was working well with good Te values; densities would need to be back-calibrated later. GPI was turned on at shot#4 and Jim Terry seemed happy with the results, although his attention (and the session leader's) was largely diverted to trying to get the software up and running for the IR camera system. (By the end of the day, the IR camera image stabilization software seemed to be working. Some timing issues remain to be work out and in-situ calibration procedures will need to be reworked. Hopefully we will have our turn-key system in place by next Friday.) Finally on a roll at shot#9, we hit our first speed bump at shot#10 -- vacuum leak. Following the fizzle of shot#11, shot#12 went through but we heard a distinct snapping sound in the power room. This turned out to be a cable breaking loose from the commutation cabinet. After a delay for repairs, shot#15 went (our second density data point NL04~0.67) but shot#16 had to be aborted for an alternator warning light. Shot#19 was another attempt to get good probe data with NL04~0.67. Then we pushed on to NL04~0.82 for shot#20 and 21 and finished with shot#23 at NL04~0.96. Without sounding like too much like an optimist, I'd say we had a fairly good run today, with a focus on getting the diagnostics working again. Our expectation levels were appropriately aligned with the realities of turning things on for the first time in this summer run campaign. But, it would be hard to count this day as a physics run. Anyway, we will now be better prepared for the smooth open road that awaits us next Friday. Shot Log: 1 -LSN, 5.5T, 0.8 MA, NL04~0.4, no probes scanning09_shots Prad_2pi_foil ~ 0.4 MW, No argon puff Strike sweep is a bit fast on vertical face. 2 -LSN, 5.5T, 0.8 MA, NL04~0.47, no probes scanning Nice strikepoint sweep. Prad_2pi_foil ~ 0.4 MW with argon puff 3 -LSN, 5.5T, 0.8 MA, NL04~0.52, ASP(0), FSP(-12), WASP(rho=2) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.4 MW with argon puff 4 -LSN, 5.5T, 0.8 MA, NL04~0.52, ASP(+2), FSP(-10), WASP(rho=0) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.42 MW with argon puff GPI NINJA puffing at 1.2 s - raises density a bit Next: probes deeper 5 -LSN, 5.5T, 0.8 MA, NL04~0.54, ASP(+4), FSP(-8), WASP(rho=-1) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.42 MW with argon puff 6 -LSN, 5.5T, 0.8 MA, NL04~0.54, ASP(+4.5), FSP(-8), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.42 MW with argon puff FSP is clean now. ASP needs more work. 7 -LSN, 5.5T, 0.8 MA, NL04~0.54, ASP(+4.5), FSP(-8), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.45 MW with argon puff 8 -LSN, 5.5T, 0.8 MA, NL04~0.54, ASP(+5), FSP(-7), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.45 MW with argon puff Impurity injection at 0.73 s ASP air pressure must be drooping. Second and third scans don't go as far. 9 -LSN, 5.5T, 0.8 MA, NL04~0.54, ASP(+5), FSP(-7), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.42 MW with argon puff Impurity injection at 0.73 s 10-LSN, 5.5T, 0.8 MA, NL04~0.67, ASP(+5), FSP(-7), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.45 MW with argon puff Torus leak. Stop to fix plus ECDC. 11 - fizzle 12-LSN, 5.5T, 0.8 MA, NL04~0.65, ASP(+5), FSP(-7), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.47 MW with argon puff 13 - fizzle. Cryopump did not cool down in time. Commutation fault. 14 - fizzle. Commutation fault. A lead broke on the commuation cabinet. Delay to affect repairs. 15-LSN, 5.5T, 0.8 MA, NL04~0.67, ASP(+3), FSP(-9), WASP(rho=-1 with manual tweaks, backed off by 2 volts) @ 0.8, 1.0, 1.2s Probes scanning, 2 mm pulled back Prad_2pi_foil ~ 0.46 MW with argon puff 16 -alternator fault indication. Shot aborted. 17 - fizzle 18 - fizzle 19-LSN, 5.5T, 0.8 MA, NL04~0.67, ASP(+4.5), FSP(-7.5), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.48 MW with argon puff 20-LSN, 5.5T, 0.8 MA, NL04~0.82, ASP(+4.5), FSP(-7.5), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.47 MW with argon puff, until 0.9 when something comes off MSE optics area and Prad increases. 21-LSN, 5.5T, 0.8 MA, NL04~0.82, ASP(+4.5), FSP(-7.5), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.47 MW with argon puff 22 - fizzle 23-LSN, 5.5T, 0.8 MA, NL04~0.96, ASP(+4.5), FSP(-6), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.55 MW with argon puff |
| Physics Operator Summaries |
| Entered: Jul 9 2010 06:07:15:653PM |
| Author: Steve Wolfe |
Physics Operator Summary for Friday, July 9, 2010
MP#570 Boundary layer heat transport experiments in L-mode plasmas
SL: Labombard
PO: wolfe
EO: Pfeiffer, Cochran, Byford, Dekow
The plan called for two density scans at 800kA and 540kA, and we got through
about half of the first scan. Some progress, but not a great day. The session
leader did seem to be getting good data on the shots we got.
The run got off to a pretty good start with the nl04=4e19 case. We spent a
long time repeating this case as the SL attempted to clean up the ASP. As a
result, the walls started to load up and the density in flattop rose from 4e19
to over 5e19 as we proceeded. There also appears to be a small discrepancy
between the DPCS nl04 feedback signal with the calibration in the hybrid and
the nl04 reading from TCI, such that a small demand was generated while nl04
was already above the setpoint, but this was not the source of the overshoot.
Things started to go downhill following a heater failure after shot#4. The
vessel temperature dropped to 8C, and while this did not immediately result in
a vacuum leak, the vessel never really recovered, and we did get a leak
associated with frozen flanges after shot#10. The first 10 shots ran well, but
the startups were changing systematically, with slower current rises and the
apparent rcur position moving steadily inward.
The leak after shot#10 cost us about an hour and a half, including 20 minutes
of ecdc after the leak sealed itself up as things warmed back up. we then got
one fizzle and one successful plasma at 6e19.
We then had a fault in the oh2L commutation circuit, as a lead broke off from
the bus connection at the top of the commutation cabinet. Shots #13 and 14
were fizzles caused by the lack of commutation of oh2L. This repair took about
two hours. Then after one successful plasma on #15 we had an alternator fault
due to a spurious temperature reading which forced a no power shot, followed
by a pair of unexplained fizzles on #17 and 18. We finally got the 8e19 cases
on #20 and 21, followed by another fizzle and the first look at the 1e20 case
on #23. This will probably be the starting point for the next run, which is
presently scheduld for next Friday.
Unresolved Issues:
-----------------
There seems to be a small discrepancy between the nl04 signal from TCI and
the feedback signal to DPCS using the nominal calibration 1.35e20/Volt. It is
not clear if this is an artifact of baseline subtraction or a change in the
calibration. Jim Irby indicates that the calibration should not have changed,
but it may have been wrong all along. For what it's worth, his scope includes
a calibration value of 1.29, which is in the wrong direction to account for
the observed discrepancy.
The BZ and RCUR values during startup seem to be more variable than last
year. I think this is associated with the TF pickup in the outboard partials,
but am not yet sure of this. Also, it is not clear whether the trend to
decreasing current rise rate today can be attributed to this effect.
For the second day in a row, we had an air leak caused by the overcooling of
the vessel. Gary is trying to come up with a satisfactory cooling setup that
doesn't lead to freeze ups. We still don't know where the leak (or leaks) are
happening, although today's may have been at F or G horizontal.
Scorecard:
No Power shots/tests 1
Duds 0
Fizzles 6 (two power supply faults)
Plasmas 16
======== ==
Shots 23
|
| Session Leader Comments | |||
| Jul 9 2010 09:30:51:937AM | 1100709001 | Brian Labombard | 1 -LSN, 5.5T, 0.8 MA, NL04~0.4, no probes scanning Prad_2pi_foil ~ 0.4 MW, No argon puff Strike sweep is a bit fast on vertical face. |
| Jul 9 2010 09:31:09:937AM | 1100709002 | Brian Labombard | 2 -LSN, 5.5T, 0.8 MA, NL04~0.4, no probes scanning Nice strikepoint sweep. Prad_2pi_foil ~ 0.4 MW with argon puff |
| Jul 9 2010 09:44:57:183AM | 1100709003 | Brian Labombard | 3 -LSN, 5.5T, 0.8 MA, NL04~0.52, ASP(0), FSP(-12), WASP(rho=2) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.4 MW with argon puff |
| Jul 9 2010 10:03:24:117AM | 1100709004 | Brian Labombard | 4 -LSN, 5.5T, 0.8 MA, NL04~0.52, ASP(+2), FSP(-10), WASP(rho=0) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.42 MW with argon puff GPI NINJA puffing at 1.2 s - raises density a bit Next: probes deeper still |
| Jul 9 2010 10:38:28:627AM | 1100709005 | Brian Labombard | 5 -LSN, 5.5T, 0.8 MA, NL04~0.54, ASP(+4), FSP(-8), WASP(rho=-1) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.42 MW with argon puff |
| Jul 9 2010 10:40:15:753AM | 1100709006 | Brian Labombard | 6 -LSN, 5.5T, 0.8 MA, NL04~0.54, ASP(+4.5), FSP(-8), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.42 MW with argon puff FSP is clean now. ASP needs more work. |
| Jul 9 2010 01:22:50:523PM | 1100709007 | Brian Labombard | 7 -LSN, 5.5T, 0.8 MA, NL04~0.54, ASP(+4.5), FSP(-8), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.45 MW with argon puff |
| Jul 9 2010 01:23:10:477PM | 1100709008 | Brian Labombard | 8 -LSN, 5.5T, 0.8 MA, NL04~0.54, ASP(+5), FSP(-7), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.45 MW with argon puff Impurity injection at 0.73 s ASP air pressure must be drooping. Second and third scans don't go as far. |
| Jul 9 2010 01:23:52:483PM | 1100709010 | Brian Labombard | 10-LSN, 5.5T, 0.8 MA, NL04~0.67, ASP(+5), FSP(-7), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.45 MW with argon puff |
| Jul 9 2010 01:24:23:073PM | 1100709012 | Brian Labombard | 12-LSN, 5.5T, 0.8 MA, NL04~0.65, ASP(+5), FSP(-7), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.47 MW with argon puff |
| Jul 9 2010 03:34:54:233PM | 1100709015 | Brian Labombard | 15-LSN, 5.5T, 0.8 MA, NL04~0.67, ASP(+3), FSP(-9), WASP(rho=-1 with manual tweaks, backed off by 2 volts) @ 0.8, 1.0, 1.2s Probes scanning 2 mm pulled back Prad_2pi_foil ~ 0.46 MW with argon puff |
| Jul 9 2010 04:53:29:793PM | 1100709019 | Brian Labombard | 19-LSN, 5.5T, 0.8 MA, NL04~0.67, ASP(+4.5), FSP(-7.5), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.48 MW with argon puff |
| Jul 9 2010 04:53:52:700PM | 1100709020 | Brian Labombard | 20-LSN, 5.5T, 0.8 MA, NL04~0.82, ASP(+4.5), FSP(-7.5), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.47 MW with argon puff, until 0.9 when something comes off MSE optics area and Prad increases. |
| Jul 9 2010 04:54:28:587PM | 1100709021 | Brian Labombard | 21-LSN, 5.5T, 0.8 MA, NL04~0.82, ASP(+4.5), FSP(-7.5), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.47 MW with argon puff |
| Jul 9 2010 05:21:55:393PM | 1100709023 | Brian Labombard | 23-LSN, 5.5T, 0.8 MA, NL04~0.96, ASP(+4.5), FSP(-6), WASP(rho=-1 with manual tweaks) @ 0.8, 1.0, 1.2s Prad_2pi_foil ~ 0.55 MW with argon puff |
| Physics Operator Comments | |||
| Jul 9 2010 07:49:51:337AM | Steve Wolfe | Getting set up for MP#570 "Heat flux footprints (ohmic L-mode)" Import seg2 from 1090923020 Ack config warning (F15 dead 9/24/09) Recalc predictors in seg2 (rcur,zcur,zcur,ci,rxl,zxl,rxu,zxu,strkpsi(11) build_all to check I got them all - no warnings. Change Nl04 gains: was PID = [8,0,3(from 0 to 0.5sec)] to [3,3,0] from 0:0.5, [3,3,1.5] from 0.5 to 1.5sec Note Integrator C gate is on until 2sec, so it will hold integral error Initial NL04 program is to 4e19 going negative at 1.3sec. Note that TF in seg2 is set to -152800, which I think is going to give 5.5T instead of 5.4. Not sure if SL cares. Segment 1: using setup from last shot 1100708027, modified to PG4 to 52msec for cryopump, leave at -0.5sec PG3 starts at -.019sec, change value from 80 to 100 BR_0 = .0005 (leave for now) IC_EF4 = -1270 stet RCUR offset = 2000 stet Note: looking at the initial rcur error waveforms on 1100708027 vs the first shot of yesterday 1100708001, the DC level (t=-0.01sec) is -2600 vs +200A-m, a difference of about 3000A-m. Part of this may be a difference in the initial Bz, EF4, but I think mostly it has to do with the bogus outer partial signals. May need to adjust RCUR offset more positive by up to 5000 during the day? Procedures enabled: dpcs_fizzle dpcs_xjump baseline_sub dpcs_piezo_chopper (PG3 is still direct drive) Procedures disabled: oh1_chopper Load at 9-Jul-2010 07:49:39.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| Jul 9 2010 09:05:35:670AM | 1100709001 | Steve Wolfe | Shot#1: IGT with cryo to 3e-8 at INIT Vessel temp=31C all magnets cold plasma lots of runaways but full length. No bounce in startup. nl04 at 4e19, as programmed, getting some gas through the pulse. Next: SL is authorizing Argon, there's already a 50msec pulse so just turn it on at PLC. EF4 to -1260 |
| Jul 9 2010 09:23:57:747AM | 1100709002 | Steve Wolfe | Shot#2:Enable B-side lower, 50msec puff EF4 to from -1270 to -1260A. No pg3 or pg4 change, I think the pg3 will give some early gas this time. Adjusting RXL sweep to be slower to nose IGT 2.1e-7 at INIT plasma full length, no runaways; early nl04 a bit higher Nl04 around 4.7e19 this time, still puffing a little? Next: Repeat, unless there's a late request from SL |
| Jul 9 2010 09:41:14:767AM | 1100709003 | Steve Wolfe | Shot#3: Repeat, unless there's a late request from SL Brian is targeting probes, NINJA will fire. IGT=2.6e-7, Vessel=27C plasma full length, probes poke, no runaways nl04 is creeping up. Drop nl04 P and I gain for next shot? Some injections starting around 1.2sec (Brian?) NINJA didn't get enabled this time, maybe next shot DC rcur level ~ -1200A-m, may need to push the offset soon Next: Drop NL04 gains P,I from 3,1.5 to 2,1, leave D=3 |
| Jul 9 2010 09:49:29:020AM | 1100709004 | Steve Wolfe | Shot#4: Drop NL04 gains P,I from 3,1.5 to 2,1, leave D=3; target still 4.0e19 plasma full length, no runaways, density is up to 5.2e19, still asking for gas? Get rid of Integral gain at least till we start going up. Next: nl04 Int gain to zero. No startup changes. |
| Jul 9 2010 10:15:20:083AM | 1100709005 | Steve Wolfe | Shot#5: nl04 Int gain to zero, target to 3.5e19 There does seem to be a discrepancy between the nl04 signal and the signal at dpcs input. No startup changes. There was a heat problem before this shot, vessel=8C coming up slowly. plasma full length, no runaways, density still high, no gas puff after .2sec except for a couple of short spikes around .7sec; the rise in nl04 seems to be wall fueling, until the ninja hits around 1.2sec, but there is still a discrepancy in the feedback signal that needs to be sorted out. The p_to_v in the hybrid tree is 1.35e20/V Current rise was slower on shot #5, pressure seemed a little higher at breakdown. Next: repeat |
| Jul 9 2010 10:30:54:713AM | 1100709006 | Steve Wolfe | Shot#6: repeat, no startup changes yet probably should up the rcur offset, it was down to -2000 on #5 Vessel temp=12C, IGT=3.2e-7 plasma full length, no runaways nl04 hanging around 5e19 until NINJA, current rise ok, but still slow, lt 150kA by 50msec Next: Adjust rcur to get 2mm narrower outer gap at 1.5sec |
| Jul 9 2010 10:45:14:370AM | 1100709007 | Steve Wolfe | Shot#7: Adjust rcur at 1.5sec from .659 to .660 to get 2mm narrower outer gap at 1.5sec Just to see, recalculate the Nl04 predictor to be sure it's picking up the current p_to_v Still resisting the temptation to tweak the startup Vessel=12C, IGT=3.4e-7 at INIT Result: plasma full length, no runaways current rise still slower, only 110kA at 50msec Next: drop pg4 to 48msec, EF4 to -1270 |
| Jul 9 2010 11:04:09:000AM | 1100709008 | Steve Wolfe | Shot#8: drop pg4 to 48msec, EF4 to -1270 IGT=3.5e-7, vessel=15C plasma full length, no runaways, current rise marginally faster, pressure dropped as expected, moved out early just a bit Injection at 0.75sec is not probe. density still coming up, gas puffing now off in seg2 Next: "One more like this" |
| Jul 9 2010 11:13:00:660AM | 1100709009 | Steve Wolfe | Shot#9: repeat IGT=3.9e-7 vess=12C we're taking 13-15 minutes between shots to cool TF, but vessel may be slowly warming up. plasma full length, no runaways, current rise about the same still a small injection at .75sec, some more later may be probe-related Next: Ready to raise nl04? |
| Jul 9 2010 12:00:15:713PM | 1100709010 | Steve Wolfe | Shot#10: raise nl04 target to 6.0e19, put back Int gain=1 vessel down to 10C, IGT=3.8e-7 plasma full length, no runaways, nl04=6.7e19; there is either an offset or a calibration problem with the nl04 feedback. The feedback signal claims 6.2e19, the Aout error is near zero. Startup injection seen at 28msec on Dalpha, CIII, drop on Zmeter. Next: rcur out another 1mm at 1.5sec, to keep up with droop in probe plunge |
| Jul 9 2010 12:20:33:227PM | 1100709010 | Steve Wolfe | Shot#11: rcur from .660 to .661 at 1.5sec, to keep up with droop in probe plunges Leak sealed up during leak checking, some possible indication at G or F horizontal. Got back down to 7 scale ECDC in D for 20minutes before proceeding |
| Jul 9 2010 12:25:36:027PM | 1100709010 | Steve Wolfe | Shot#11: rcur from .660 to .661 at 1.5sec, to keep up with droop in probe plunges Leak sealed up during leak checking, some possible indication at G or F horizontal. Got back down to 7 scale ECDC in D for 20minutes before proceeding vessel now up to 23C |
| Jul 9 2010 12:00:59:253PM | 1100709011 | Steve Wolfe | Shot#11: rcur from .660 to .661 at 1.5sec, to keep up with droop in probe plunges Vessel temp dropped to 9C, we have an air leak. There will be a delay IGT is up to 5.5e-5 and holding Tommy reports lots of frozen ports We'll do some ecdc once the leak gets sealed. |
| Jul 9 2010 12:56:32:807PM | 1100709011 | Steve Wolfe | Shot#11: rcur from .660 to .661 at 1.5sec, to keep up with droop in probe plunges Try again, after ecdc IGT=2.4e-7, Vessel=21C fizzle, pressure dropped from .06 on #10 to .05mTorr, maybe a bounce, but it doesn't look like it's outside unless the rcur offset has really drifted badly. Next: pg4 to 50msec |
| Jul 9 2010 01:10:59:110PM | 1100709012 | Steve Wolfe | Shot#12: pg4 to 50msec Still trying for 6e19 with smaller outer gap at EOF Note that on shot#11 the rcur offset is back to -900 IGT=1.2e-7, vessel=23C Base pressure with cryo is way down plasma full length, no runaways, slow current rise again, similar to 10 outer gap is scanning as requested by SL initial rcur error is still about -900A-m, p0 still ~.05mTorr Dalpha burnout is pretty fast, slower on Zmeter, lump on CIII Next: repeat |
| Jul 9 2010 01:23:11:823PM | 1100709013 | Steve Wolfe | Shot#13: take rcur to .661 at 1.2sec, flat to 1.5sec still trying to toast the ASP Cryo wasn't ready, still at 2.2e-6 at INIT Cooling during init and check, 2.0e-7 at PULSE fizzle. OH2L did not commutate. Next: try that again |
| Jul 9 2010 01:31:35:513PM | 1100709014 | Steve Wolfe | Shot#14: repeat with rcur =.661 at 1.2sec, flat to 1.5sec still trying to toast the ASP IGT=1.3e-7, vessel=23C fizzle, oh2l did not commutate again Engineers to the power room |
| Jul 9 2010 03:28:49:237PM | 1100709015 | Steve Wolfe | Shot#15: Following repair of comm cabinet lead, repeat with rcur =.661 at 1.2sec, flat to 1.5sec No startup changes, not sure what to expect. still trying to toast the ASP IGT=6e-8, vessel=29C at INIT Result: plasma full length, no runaways Startup looks nicer, to 150kA at .05, no bounce P0 still at .05mTorr, gaps did as requested Initial rcur dc= +500A-m, about back to where we started SL pulled the probes back, so he needs another one Next: Repeat |
| Jul 9 2010 03:36:33:897PM | 1100709016 | Steve Wolfe | Shot#16: Repeat, no dpcs changes IGT=2.2e-7, vess=28C Result: Alternator in alarm, no power shot. DPCS will probably time out in check. |
| Jul 9 2010 03:55:18:227PM | 1100709017 | Steve Wolfe | Shot#17: Repeat, no dpcs changes The alternator alarm on #16 was supposedly a spurious temp reading. IGT=1.4e-7, vess=28C Result: fizzle, hardly any current, but fields look ok until it seems to move in. I don't understand why this didn't go. Next: raise pg4 to 52msec |
| Jul 9 2010 04:05:52:430PM | 1100709018 | Steve Wolfe | Shot#18: raise pg4 to 52msec IGT=9.3e-8, vess=28C Result: another fizzle, I don't see what's wrong Next: raise Br, pg4 some more |
| Jul 9 2010 04:24:00:073PM | 1100709019 | Steve Wolfe | Shot#19: raise pg4 to 55msec, BR_0 from 0.0005 to .001 EF4 from -1270 to -1290 result: plasma full length, no runaways I don't know what worked, but something did P0 still only .054mTorr, current still hesitating, BR looks too positive, I think I'll back off there. Next: Br_0 from .001 to .0007, raise nl04 to 8e19 |
| Jul 9 2010 04:34:39:963PM | 1100709020 | Steve Wolfe | Shot#20: Br_0 from .001 to .0007, raise nl04 to 8e19 raise rcur offset from 2000 to 2500, not sure if that's the right way or not. plasma full length, no runaways, got the density. startup very similar to 19, except for an injection at 26msec RCUR still seems to be inside, P0 up to .055mTorr still a slight hesitation and slow current rise. Matt notes arcs and sparks on the MSE heatshield after 1sec, Fe injections show up on bolo next: repeat |
| Jul 9 2010 04:43:27:137PM | 1100709021 | Steve Wolfe | Shot#21: repeat 8e19 IGT=3.4e-7, Vess=24C may be losing the cryopump in INIT, up to 4.1e-7 at Check, holding result: plasma full length, no runaways, worse Ip hesitation, dives inside then recovers. This startup is really bad, but I'm not sure which way to go with it. P0=.056mTorr Next: change rcur offset from 2500 to 1500 Increase nl04 to 1e20 |
| Jul 9 2010 05:22:37:723PM | 1100709023 | Steve Wolfe |
Shot#23: change rcur offset from 1500 to 2500
decrease pg4 from 55 to 50msec
still trying for 1e20.
plasma full length, no runaways, got the density,
startup still lousy, hangs inside until 20msec, current
rise very slow, injection at 28msec,
physaout rcur error is still negative through the startup,
it doesn't seem to be able to move it out.
Whatever it's doing, this shot worked, and that's the
END OF RUN
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| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:56:41:370AM | Plasma | Ok | |
| 2 | 09:13:40:990AM | Plasma | Ok | |
| 3 | 09:29:11:387AM | Plasma | Ok | |
| 4 | 09:42:04:457AM | Plasma | Ok | |
| 5 | 10:05:16:110AM | Plasma | Ok | |
| 6 | 10:20:55:630AM | Plasma | Ok | |
| 7 | 10:38:27:177AM | Plasma | Ok | |
| 8 | 10:53:10:387AM | Plasma | Ok | |
| 9 | 11:08:42:880AM | Plasma | Ok | |
| 10 | 11:22:57:073AM | Plasma | Ok | |
| 11 | 12:47:25:457PM | Plasma | Ok | |
| 12 | 01:00:22:090PM | Plasma | Ok | |
| 13 | 01:14:08:760PM | Plasma | Ok | |
| 14 | 01:28:00:410PM | Plasma | Ok | |
| 15 | 03:21:00:910PM | Plasma | Ok | |
| 16 | 03:33:52:623PM | Plasma | Bad | Alternator Fault, no power |
| 17 | 03:43:29:103PM | Plasma | Ok | |
| 18 | 03:56:46:547PM | Plasma | Ok | |
| 19 | 04:09:37:327PM | Plasma | Ok | |
| 20 | 04:22:54:333PM | Plasma | Ok | |
| 21 | 04:36:00:660PM | Plasma | Ok | |
| 22 | 04:48:36:823PM | Plasma | Ok | |
| 23 | 05:01:28:337PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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