| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Yuichi Takase |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Joe Daigle,Frank Silva,Vinny Bertolino |
| Engineering Operator Run Comment |
| 8T Wolfe |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:15:163PM |
| Author: To Be Determined |
| Run summary 960213 MP#117 7.9T D(He3) heating SL: Takase PO: Wolfe EO: Silva/Bertolino/Daigle Overnight boronization ECDC in He for 2hrs before run Run plan: 1. Fiducial 2. 5.3T H-mode conditioning shots Also try off-axis (outside of sawtooth inversion radius) heating 3. 8T H-mode, 1.0MA then 1.2MA Try various RF power step programming (including modulation) Another late start, plus leaks, power glitch, etc. (see the physics operator's summary for details). We did achieve the record stored energy at 8T (nearly 200kJ) with a good H-factor (about 1.8). We took 7 shots at lower fields (5.3T and 6.2T) to condition the freshly boronized wall for H-mode operation, including one fiducial shot. As observed during previous weeks, it was clear that H-mode quality improved over the first several shots, but after 7 shots we have not yet achieved the "well-conditioned" H-mode performance (960116025). Shots at 6.2T had the minority resonance outside the sawtooth inversion radius. Although the central temperature increase was lower, as expected, the stored energy increase was comparable to on-axis resonance heating. This is very different from the pre-boronization result. The problem with the 8T diamagnetic measurement was identified to be saturated signal. The measurement looks promising after the saturation problem is fixed (after shot 14). We did obtain good H-modes at 1.2MA. Shot 18 had RF power modulation, but it stayed in L-mode for most of the RF pulse. Shot 19 had RF power steps (unintentional) which would be useful for evaluating the absorption efficiency (preliminary analysis indicates approximately 60% absorption). Shot 01 test Relay test 02 test OH test 03 test TF test 04 fiz 5.3T 1MA (loaded 960116025) H-mode conditioning 05 pla disrupt @ 1s, nel=1.1 @ RF turn on, 2.5MW 120kJ 06 dud mag res fault 07 pla 2.5MW, 115kJ, inj @ 0.63s 08 pla 6.2T (res outside q=1) nicer shot, 2.5MW, 135kJ 09 pla 5.3T disruption @ 1.14s, 2.5MW, 150kJ 10 pla 6.2T got nel=0.8, worse H-mode, inj before RF, 2.5MW, 115kJ 11 pla 5.3T fiducial 72kJ @ 1MW 12 pla 6.2T 2.5MW, 145kJ, HeII baseline shot (very little background) start 8T run 13 pla 7.9T 1.0MA (loaded 960207012) 50ms He3 puff, 2.4MW, 128kJ cell access for Granetz to fix diamag (saturates @ 8T) 14 pla disr @ 0.1s (Granetz's integrator board out) 15 pla 30ms He3 puff, 1.0MW (D-port only), 90kJ (no H-mode) N2 leak after shot 16 pla 35ms He3 puff, 2.5MW, 198kJ (delayed H-mode) 17 pla 2.5MW, 193kJ (short H-mode, inj @ 0.9s) delay caused by leak and power glitch 18 pla RF modulation 1.3-2.5MW, 136kJ (late H-mode) 19 pla good power steps from E-port trips, 2.8MW, 175kJ |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:56:100PM |
| Author: To Be Determined |
| Phys Op Summary for Tuesday 960213 MP# 117 7.9T D(He3) heating SL: Takase PO: wolfe EO: Silva/Bertolino/Daigle Run Plan -------- After boronization, He ECDC 0. OH and TF tests 1. Fiducial 2. 5.3T H-mode conditioning shots Also try off-axis (outside of sawtooth inversion radius) heating 3. 8T H-mode, 1.0MA then 1.2MA Try various RF power step programming (including modulation) The run got off to a late start due to a variety of SNAFUs, the most serious of which was a bug in the CRYO PLC program which prevented the relays from closing and the 5V supply from turning on for the resistance measurements. "Don't upgrade a working system!" Shot #1 was a no-power cycle to try to get the relays to close. First power test was #2, run at around 10AM. A TF test (#3)was requested by the engineers because the filter on the TF was changed again, this time to .75Hz. The test went ok, with a reduction in alternator oscillations, but Vinnie later decided that the filter wasn't properly configured and put it back the way it was before. The fiducial was postponed because there was a problem with the VUV, eventually traced to a cable interfering with the limit switch on the stepping motor drive. It was eventually taken at shot #11. We started with 1MA conditioning discharges, based on 960116025 and 960206004. Shots #4 fizzled - Br too negative at 0.0064. Changed to .0074 for next shot. Shots #5,7-10,12 were 1MA conditioning shots, some at 5.3T and some at 6.2T. Off-axis heating seemed to work as well or better than on-axis. There was a clear improvement in confinement over this sequence. Shot 6 was a dud with no 13.8 supplies (spurious magnet resistance fault). Shot#11 was the fiducial. Shot 13-19 were at 7.9T, #15-19 at 1.2MA. See the logbook for shot-by-shot record. Best shots were probably 16 and 17 which got close to 200kJ. Shot 14 had no Ip trace or feedback because RSG had removed the integrator board to prevent saturation of the diamagnetic signal, without realizing the same board had the rogowski integrator. The shot actually ran until shortly after segment switch. There were long delays caused by a N2/Ar leak, later an air leak. This was probably but not definitely the B-bottom leak, on which the purge had become semi-operative. At about the same time the alternator house had a power glitch and the speed had to coast down below 1200 rpm before it could be sped up again. The leak was apparently "fixed" by the end of the run. The J-port ratiomatic was dead at the start of the day. Joe Snipes changed filaments during one of the delays. Calibration is unknown. The RGA is also dead with a blown filament. All of the 1.2MA shots had EF2 currents above 5kA at .7-.8sec. I reduced these somewhat by relaxing the RXU and ZXU demands and forcing the EF4 voltage to stay maxed out through .5sec using the voltage pre-program. On shot 19 EF4 hit its current rail at +3500A; this should be increased to the admin. limit of 5000A. In view of the number of shots required to condition after boronization, running 8T on Tuesday seems to be a bad idea. Scorecard: ---------- Shots 19 Tests 3 Duds 1 Fizzles 1 Plasmas 14 (counting #14 on which the current didn't register, but reached >500ka) |
| Session Leader Comments | |||
| Feb 13 1996 09:09:11:480AM | Yuichi Takase | MP#117 7.9T D(He3) heating
SL: Takase PO: Wolfe EO: Silva/Bertolino/Daigle Overnight boronization ECDC in He for 2hrs before run Run plan: 1. Fiducial 2. 5.3T H-mode conditioning shots Also try off-axis (outside of sawtooth inversion radius) heating 3. 8T H-mode, 1.0MA then 1.2MA Try various RF power step programming (including modulation) | |
| Feb 13 1996 09:12:33:010AM | 960213001 | Yuichi Takase | Shot 001: Relay test
|
| Feb 13 1996 09:12:45:410AM | 960213002 | Yuichi Takase | Shot 002: OH test
|
| Feb 13 1996 09:24:07:340AM | 960213003 | Yuichi Takase | Shot 003: TF test
|
| Feb 13 1996 10:15:54:890AM | 960213004 | Yuichi Takase | Shot 004: fizzle
reload of 960116025 (5.3T 1MA H-mode conditioning) |
| Feb 13 1996 10:46:33:230AM | 960213005 | Yuichi Takase | Shot 005: plasma
disrupt @ 1s, 2.5MW 120kJ |
| Feb 13 1996 10:57:37:830AM | 960213006 | Yuichi Takase | Shot 006: dud
mag res fault |
| Feb 13 1996 10:58:40:390AM | 960213007 | Yuichi Takase | Shot 007: plasma
2.5MW, 115kJ, inj @ 0.63s |
| Feb 13 1996 11:14:14:620AM | 960213008 | Yuichi Takase | Shot 008: plasma
6.2T nicer shot, 2.5MW, 135kJ |
| Feb 13 1996 11:45:43:190AM | 960213009 | Yuichi Takase | Shot 009: plasma
5.3T disruption @ 1.14s, 2.5MW, 150kJ |
| Feb 13 1996 11:46:38:360AM | 960213010 | Yuichi Takase | Shot 010: plasma
6.2T got nel=0.8 (have been trying to get this) worse H-mode, inj before RF, 2.5MW, 115kJ |
| Feb 13 1996 11:48:04:620AM | 960213011 | Yuichi Takase | Shot 011: plasma
5.3T fiducial 72kJ @ 1MW |
| Feb 13 1996 11:59:57:080AM | 960213012 | Yuichi Takase | Shot 012: plasma
6.2T 2.5MW, 145kJ, HeII baseline shot (very little background) |
| Feb 13 1996 12:47:13:660PM | 960213013 | Yuichi Takase | Shot 013: plasma
7.9T 1.0MA (loaded 960207012) 50ms He3 puff, 2.4MW, 128kJ cell access for Granetz to fix diamag (saturates @ 8T) |
| Feb 13 1996 12:54:33:480PM | 960213014 | Yuichi Takase | Shot 014: plasma
disr @ 0.1s (Granetz's integrator board out) |
| Feb 13 1996 01:59:21:800PM | 960213015 | Yuichi Takase | Shot 015: plasma
30ms He3 puff, 1.0MW (D-port only), 90kJ (no H-mode) N2 leak after shot |
| Feb 13 1996 02:15:25:940PM | 960213016 | Yuichi Takase | Shot 016: plasma
35ms He3 puff, 2.5MW, 198kJ (delayed H-mode) |
| Feb 13 1996 02:17:10:380PM | 960213017 | Yuichi Takase | Shot 017: plasma
2.5MW, 193kJ (short H-mode, inj @ 0.9s) |
| Feb 13 1996 05:11:10:900PM | 960213018 | Yuichi Takase | Shot 018: plasma
RF modulation 1.3-2.5MW, 136kJ (late H-mode) |
| Feb 13 1996 05:11:32:200PM | 960213019 | Yuichi Takase | Shot 019: plasma
good power steps from E-port trips, 2.8MW, 175kJ |
| Physics Operator Comments | |||
| Feb 13 1996 07:17:46:200AM | Steve Wolfe | MP#117 7.9T D(He3) ICRF
SL: TAkase PO: Wolfe EO: Silva/ Plan- Start with Tuesday OH test and TF test Fiducial based on 960206003 Run 5T shots conditioning shots until H-mode looks good; may try off-axis heating at higher field as we wait. Start from 960116025. 7.9T H-mode, 1.0MA then 1.2MA - start from 960207012 | |
| Feb 13 1996 08:00:52:390AM | Steve Wolfe | Boronization lasted aboit 12 hours and consumed 120psi of diborane mix.
He ECDC on at 6:45 and off at 8:00 | |
| Feb 13 1996 08:13:15:120AM | 960213001 | Steve Wolfe | Shot 960213001 - no power test to get relays to cycle.
|
| Feb 13 1996 09:10:36:820AM | 960213002 | Steve Wolfe | Shot 960213002 - Tuesday oh test.
|
| Feb 13 1996 09:18:38:200AM | 960213003 | Steve Wolfe | Shot 960213003 - TF test. looks ok, no overshoot. Irby says oscillation
is much reduced. |
| Feb 13 1996 10:17:02:980AM | 960213004 | Steve Wolfe | Shot 960213004 - VUV is screwed up. Start the conditioning sequence.
Load 960116025, with pre-pulse reduced to 14msec. Relay/s and 5V supply screwed up again. Long delay before shot. Meanwhile JT has fixed the VUV, but we'll start with the conditioning discharges anyway. Fizzle. |
| Feb 13 1996 10:33:43:810AM | 960213005 | Steve Wolfe | Shot 960213005 - Increase Br from .0064 to .0074.
Note- ratiomatic seems to be dead again. PLasma disrupted at 1sec. Looks like an injection at .94sec. About 110kA of halo current. Only 122kJ in h-mode before disruption. |
| Feb 13 1996 10:37:36:450AM | 960213006 | Steve Wolfe | Shot 960213006 - Reduce PG3 to zero from .38sec
Magnet resistance fault. No shot. |
| Feb 13 1996 10:50:51:300AM | 960213007 | Steve Wolfe | Shot 960213007 - Reduce PG3 to zero from .38sec
Plasma - ramps down this time. Still have a current rise disruption as noted by Ian on last shot. Still only 120kJ |
| Feb 13 1996 11:05:47:160AM | 960213008 | Steve Wolfe | Shot 960213008 - Load 960206004 (longer shot, otherwise same.)
Change Br to .0074, drop PG3 in segment 2, increase late PG3 in seg 1. Increase PLC setting for TF to 176kA from 151 - should give 6.2T Vinnie has put the TF supply filter back the way it was last week. He believes there is something wrong with what was installed. Plasma - ramps down ok. Still getting a rising density before RF. 140kJ. |
| Feb 13 1996 11:18:11:760AM | 960213009 | Steve Wolfe | Shot 960213009 - Drop PG3 segmewnt 2 puff a little earlier. Go back to
5.3T PLasma disrupted at 1.15sec (early ramp down). 150kJ. |
| Feb 13 1996 11:32:50:680AM | 960213009 | Steve Wolfe | Shot 960213010- Back to 176kA (6.2T) on TF.
Plasma- ramps down ok. No halpha blob, multiple stutters in H-mode. 117kJ. |
| Feb 13 1996 11:32:56:010AM | 960213010 | Steve Wolfe | Shot 960213010- Back to 176kA (6.2T) on TF.
Plasma- ramps down ok. No halpha blob, multiple stutters in H-mode. 117kJ. |
| Feb 13 1996 11:40:17:970AM | 960213011 | Steve Wolfe | Shot 960213011- Fiducial, load 960206003 and change Br to .0074.
Fiducial ok. |
| Feb 13 1996 11:58:47:020AM | 960213012 | Steve Wolfe | Shot 960213012- reload from shot 10 and put back some of the seg2
gas puff. Back to 6.2T. Plasma - ramps down ok. 145kJ |
| Feb 13 1996 12:11:40:040PM | 960213013 | Steve Wolfe | Shot 960213013- Ready for 8Tesla.
Load from 960207012. Increase He3 puff from 30msec to 50msec. Plasma - 128kJ. RF not on all the time. |
| Feb 13 1996 12:45:08:880PM | 960213014 | Steve Wolfe | Shot 960213014- Raise current to 1.2MA. GO back to 30msec He3 puff.
Reduce seg2 PG3 puff to zero after .45sec to try to eliminate rise in NL04 above program. Early disruption. Granetz had removed an integrator board between shots to fix a saturation on the diamagnetic signal. It looks like he removed the Ip integrator as well!! |
| Feb 13 1996 01:32:14:040PM | 960213015 | Steve Wolfe | Shot 960213015- Raise current to 1.2MA. GO back to 30msec He3 puff.
Reduce seg2 PG3 puff to zero after .45sec to try to eliminate rise in NL04 above program. Try again after RSG puts things back. Plasma - ramps down ok. Only 1MW, just ditrhers no H-mode. |
| Feb 13 1996 01:45:42:620PM | 960213016 | Steve Wolfe | Shot 960213016- Increase He3 puff to 35msec. There was a N2 leak between
shots; seems to have reclosed. Plasma- RF ok from .73, doesn't get into H-mode until .86. In between there is a burst of vertical instability. 200kJ. Ian points out we are moving very close to the antenna at .45sec. |
| Feb 13 1996 02:34:40:400PM | 960213017 | Steve Wolfe | Shot 960213017- Reduce NL_04 demand to 7e19 (from 8). Move plasma in a
bit before .5sec. Remove RXL zig-zag. Plasma - still getting very high EF2U currents. This one drops put of H-mode at .92sec; why? Gets to 193kJ before it drops out. No spectroscopy data on H-alpa, 2pi, z-meter. CAMAC INIT failure. |
| Feb 13 1996 02:34:58:300PM | 960213017 | Steve Wolfe | Shot 960213017- Reduce NL_04 demand to 7e19 (from 8). Move plasma in a
bit before .5sec. Remove RXL zig-zag. Plasma - still getting very high EF2U currents. This one drops put of H-mode at .92sec; why? Gets to 193kJ before it drops out. No spectroscopy data on H-alpa, 2pi, z-meter. CAMAC INIT failure. |
| Feb 13 1996 04:17:30:520PM | 960213018 | Steve Wolfe | Shot 960213018- Move RXU and ZXU in and down to try to get rid of
large EF2U currents. Long delay due to leak, then a power glitch which drops the alternator. Plasma - EF2U is still high, but better. RF power was modulated, probably a bit too much; It doesn't really get into a good H-mode. 130kJ. |
| Feb 13 1996 04:47:25:270PM | 960213019 | Steve Wolfe | Shot 960213019- Noticed that EF4 demand was actually dropping between
200 an 400ms, possibly lengthening time in crossover. Fix this using V_EF4 for shot 19. Plasma - disrupted in rampdown, PF crowbar. Brick. Also there was an RF dropout. Got to 170kJ before bad things happened. EF4 hit current rail (3.5kA) at 1sec. EF2U is down a bit, still high. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 06:28:13:900AM | Test | Ok | |
| 2 | 09:05:37:120AM | Test | Ok | oh test |
| 3 | 09:13:54:200AM | Test | Ok | |
| 4 | 10:11:15:760AM | Plasma | Ok | |
| 5 | 10:22:07:610AM | Plasma | Ok | |
| 6 | 10:35:58:520AM | Plasma | Bad | mag res fault in pulse |
| 7 | 10:43:29:260AM | Plasma | Ok | |
| 8 | 10:57:06:350AM | Plasma | Ok | |
| 9 | 11:10:23:370AM | Plasma | Ok | |
| 10 | 11:25:08:650AM | Plasma | Ok | |
| 11 | 11:38:05:760AM | Plasma | Ok | |
| 12 | 11:50:54:570AM | Plasma | Ok | |
| 13 | 12:03:53:930PM | Plasma | Ok | |
| 14 | 12:39:08:890PM | Plasma | Ok | |
| 15 | 01:00:14:320PM | Plasma | Ok | |
| 16 | 01:35:26:330PM | Plasma | Ok | |
| 17 | 02:03:13:520PM | Plasma | Ok | |
| 18 | 04:08:49:220PM | Plasma | Ok | |
| 19 | 04:36:55:750PM | Plasma | Ok | Comm fault OH2U & OH1 |