| Miniproposals | ||||||||||||
|
| Operators | |
| Session leader(s): | Jerry Hughes,Kenneth Marr |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Bill Cochran,Andy Pfeiffer,Gary Dekow |
| Engineering Operator Run Comment |
| SL Plan for MP 483: "Initial Experiments Measuring Pedestal Characterist |
| Session Leader Plans |
| Entered: May 30 2007 04:59:43:160PM |
| Author: Jerry Hughes |
| SL Plan for MP 483: "Initial Experiments Measuring Pedestal
Characteristics using CXRS" Goals for this experiment include the measurement of ion temperature pedestal and its response to changes in collisionality, and the examination of boron velocity changes to stored energy and magnetic topology. Data are to be acquire at distinct values of plasma current, while attempting to achieve low collisionality and high stored energy. Ip will range from 0.6 to 1.2MA. B=5.4T for all shots. DNB timing 25ms on 15ms off. ***NINJA enabled with 8psi D2*** RF in steps: 1MW starting at 0.6s 2MW starting at 0.9s max. available starting at 1.2s Begin with LSN geometry, switch to USN later in the day. Outer and inner gap (mostly the outer gap) should be maintained as steady as possible. LSN: Load shot 1070516005 and adjust Ip, target nl04 as called out below. USN: Load shot 1070525013 and adjust Ip, target nl04. At least 2 shots at each of the following conditions: 1)LSN, I=0.6MA, nl_04 = 0.4*10^20 m^-2 2)LSN, I=0.6MA, nl_04 = 0.6*10^20 m^-2 (consider going to I=0.8MA, nl_04=0.6-0.8*10^20 m^-2 if trouble getting H-modes) 3)LSN, I=1.2MA, nl_04 = 0.6*10^20 m^-2 4)LSN, I=1.2MA, nl_04 = 0.8*10^20 m^-2 5)LSN, I=1.2MA, nl_04 = 1.0*10^20 m^-2 (Consider going to I=1MA, if trouble getting H-modes) 6)USN, I=0.6MA, nl_04 = 0.8*10^20 m^-2 7)USN, I=1.2MA, nl_04 = 0.8*10^20 m^-2 If there is extra time at the end of the run go to LSN, I=1.0MA, nl_04=0.8*10^20 m^-2, constant RF power at 1MW above threshold starting at T=0.7s. Run several shots stepping up DNB current from 5.5 to 6.5A. |
| Physics Operators Plans |
| Entered: May 30 2007 04:54:35:050PM |
| Author: Steve Wolfe |
Physop Plan and Engineering setup for Thursday, May 31, 2007
MP#483 "Initial Experiments measuring pedestal characteristics using CXRS"
SL: Marr, McDermott, Hughes
PO: Wolfe
Overnight boronization should be carried out on Wednesday, May 30, followed
by two hours of ECDC in Helium.
Boronization prescription:
Use EF4 vertical field, 200 Amps as on 1070514
Sweep = 44/85/70 (min/max/dwell)
Dwell/period=30/60
Pressure setting: tc6=35mTorr (tc3<1mTorr)
Run boronization until 05:30AM on Thursday
Following boronization, run ECDC two hours, finishing by 08:00
ECDC in helium, 5e-5 Torr
sweep 44/103/45 (min/max/dwell)
******************************************************************
Engineering setup:
Power Systems as on 1070516005
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 enabled (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill B-main with 40 psi D2 Hybrid enabled (PG3)
pump out NINJA and backfill with 8 PSI of D2, then disable.
Enable the following gate valves and shutters:
ECE, DNB, VUV, Z-bolo shutters
Torvac setup: Pumpstack gatevalves open
Leave RGA's closed and off.
ICRF setup: FMIT#1 and 2 in RUN-On by 8:30
FMIT#3 and 4 don't bother (unless Wukie changes his mind)
LH: None
*****************************************************
Physop plan:
Import segment 2 from 1070516005
Change Ip from 0.8 MA to 0.6MA
Decrease Nl_04 to 0.4e20 (from 0.8e20)
Follow shot sequence per SL_PLAN:
At least 2 shots each with
1) LSN 0.6MA 0.4e20
2) LSN 0.6MA 0.6e20
Possibly change to 0.8MA, 0.6/0.8 e20
3) LSN 1.2MA 0.6e20
4) LSN 1.2MA 0.8e20
5) LSN 1.2MA 1.0e20
Possibly change to 1.0MA
Since J-port not available, it seems unlikely we would go to
the upper null part of this experiment, but if we do use 1070525013 and
change current, density to
6) USN 0.6MA, 0.8e20
7) USN 1.2MA 0.8e20
All the above use stepped RF per SL_PLAN. DNB timing 25ms on/15ms off.
If there is time, go to LSN 1.0MA 0.8e20, constant RF, stepped DNB current.
(See SL_PLAN).
|
| Session Leader Summaries |
| Entered: May 31 2007 05:52:18:210PM |
| Author: Jerry Hughes |
| The run was reasonably successful in terms of obtaining the plasma conditions
called out for in the run plan. LSN H-modes were obtained in 0.6MA, 1.0MA and 1.2MA with target density scans at each current. The steadiest H-modes obtained were at 1.0MA and below, where EDA operation is predominant, and good spectra were obtained using CXRS diagnostics. A significant span in H-mode stored energy was also obtained through the variation in Ip, Prf (40kJ pressure. Confinement was observed to be quite good early in the day, with substantial temperature pedestals, and H-factors occassionally approaching 1.7. This tended to settle around a more pedestrian 1.4 as the day wore on. Overall, though, impurities and injections were not a big concern, and it looks like the overnight boronization had its usual good effects without significant recovery cost. Maximum available RF power turned out to be approximately 2MW out of D+E antennas. Because this was not very far above the threshold power anyway, we quickly abandoned the three-tier power steps and moved on to a flat RF pulse. The best RF results were obtained with total power below 2MW. An optimistic attempt to achieve USN H-mode at 1.2MA resulted in two USN L-modes. We were simply too power-starved to get an L-H transition. The last two plasmas (25,27) were attempts at steady EDA H-modes, first with the DNB operating, and the 2nd without, so that McDermott could evaluate non-beam background in the CXRS diagnostic. See McDermott's and Marr's summaries for further details. |
| Entered: May 31 2007 10:12:21:140PM |
| Author: Kenneth Marr |
| Today's run covered a good portion of the goals as stated in the mini-proposal for the innerwall GPI system. Specifically we were interested in covering a range of stored energy and taking data in both L-mode and H-mode.
We began at low puff pressures and puff lengths in order to keep from perturbing the low density shots. These appeared to give sufficient signal increase and the data showed a visible movement in wavelength from L to H-mode. As we moved to higher currents and densities, I increased the puff lengths and added a third puff. The density continued to be unchanged by the amount of gas we were puffing. At one point we decreased the puff length but increased the puff pressure to 12psi so as to provide a stronger 2nd and 3rd puff. For the two USN shots late in the day, that did not achieve H-mode, the density remained constant under 'heavy' puffing. Around shot 7, the signal from a few inner wall views was found to be saturating and the gain on the spectrometer was reduced. The shots showed strong Zeeman splitting at the inner wall views and a measurable increase in signal during the puffs. The H-mode also affected the signal levels, but the background views should give simultaneous measurement of the background plasma. Unexpected lines near the lines of interest may complicate analysis, however. Overall, the data should be able to be analysed for velocity and temperature profiles and these profiles can be compared with Thomson Scattering and Hirex measurements. Shots that were not achieved include USN shots in H-modes, higher power LSN shots utilizing all ICRF antennae, and a possible scan of the left gap. |
| Entered: Jun 1 2007 12:23:53:630PM |
| Author: Rachael Mcdermott |
| The goals for the experiment were:
1) To measure the response of the ion temperature pedestal width to changes in collisionality via edge CX measurements, and to determuine whether the ion temperature pedesal differs from the electron pedestal in low collisionality regimes. 2) To measure the changes in the edge velocity profiles to changes in stored energy and magnetic topology. To do this the MP called for a range of plasma currents from I=600KA to 1.2MA, with plasma density ln_04 from 0.4-1.2*10^20m^2. In each of these conditions RF power was to be stepped up in three tiers throughout the shot. In each of these conditions a constant EDA H-mode was required to make reliable CX pedestal measurements. The run was reasonably successful. At Ip=600KA we obtained steady EDA H-modes at two different densities ln_04=0.5, and 0.8*10^20. At 1.2MA we had trouble getting the EDAs and instead ended up with ELM-free, which unfortunately, were not steady enough for reliable CX pedestal measurements. We dropped the current to 1MA, where we obtained EDA's at 3 different densities, nl_04=.6,.8, and 1.0*10^20m^2. The DNB was operating very well at 6Amps. Unfortunately, we discovered that the current rise time to 6amps, was not the anticipated 13ms but closer to 24ms, which limited the CX timing. We ran most of the day with 34ms on period and a 13ms off period. This was still sufficient to make pedestal measurements during the flat top of the EDA H-modes. The active CX signal was very good, the best we've seen so far varying between 20 and 60% depending on plasma conditions. Two USN shots were attempted, but ended up with beautiful USN L-mode plasmas, and a couple of fizzles/disruptions. At the end of the day we went back to a background subtraction piece of MP 482, and obtained two shots at Ip=1MA, and nl_04=1.0 with very similar L-H transitions, one with DNB and one. The CX signal increase during the beam shot was very clear. |
| Physics Operator Summaries |
| Entered: May 31 2007 05:58:10:570PM |
| Author: Steve Wolfe |
Physop summary for Thursday, May 31, 2007
SL: Hughes, Marr, McDermott
PO: wolfe
EO: Cochran, Pfeiffer, Dekow
MP#483 Pedestal characteristics
This was a reasonably successful run. We got most
of the cases from the run plan covered, although
some points were abandoned after one shot because the
H-mode conditions were not steady enough.
We ended up with useful data at 600kA, 1.0MA and 1.2MA in
lower null. Only the high current (1.2MA) Upper null condition
was tried, and there was not enough power from the RF to get H-mode
at either 1.2 or 1.0e20. We also ended up with a 1.2MA disruption
in upper null, which led to a fizzle. Good EDA H-modes were obtained
at 1.0e20 and 1.0MA; lower densities were marginal for EDA, and
gave typically 3 H-modes, of which the last was the most EDA-like.
The run got off to a late start because of power system problems,
first a breaker/OH1 fault that wouldn't reset and then a problem
with the PLC program monitoring the EF1U comm bank charge. There were
also some data system problems before we got going. The first plasma
shot was #4, at about 10:30.
Later in the day we lost another hour to a problem with HEAT system. The
heater alley breaker tripped on over-temperature, and further investigation
revealed a group of TC's near C-port that were reading very high, due to
their cable being encased in ice.
Some small changes in the gap program were required to put the
pedestal where the different diagnostics wanted it. I tried modifications
to the RCUR gain to try to steady the outer gap during L-H-L transitions
and RF trips, but this was not very successful. Increasing the P gain
seemed to drive rcur a bit unstable. I set up to try integral gain
(putting wire 1 on Integrator A in the \\hybrid::top.config.wires),
but then the SL requested we move on to 1.2 MA, so I never implemented
it. Wire 1 remains on Integrator A, since it can't hurt. It may be useful
to try this approach in the future.
The machine ran well after last night's boronization, with few injections
and reasonable density control. We had no difficulty going from 0.6 to 1.2MA, etc. I adjusted the IC_EF4 current on each change of Ip program, but it's not
obvious this was needed. The higher density 1.2MA cases tended to disrupt in
rampdown with EF2's going to zero; this was remedied by slowing down the
negative ramp on CLEARIN after 1.5sec. Some changes to segment 1 pre-puff
(PG4) were made to compensate as we went up and down in current and density.
Gas puff adjustments after disruptions were not as successful, and we had
a few fizzles. The last two shots were supposed to be a matched pair
to test background subtraction, and I had to beg for an extra shot
after 17:00 when #26 fizzled.
Before the run I made a change to the pre-charge OH2 program to try to avoid
the demand increasing above 100V, especially on OH2U, during the time before
the switch closes at -0.7sec. This was partially successful, but the demand
still goes above what the supply can do between -.56 and -.36sec. A decrease
in the Pgain or another delay in the IC_OH2 program could help avoid this.
The problem seems to arise because the OH2 current is held back by induced
voltage from OH1 and EF2's during this interval. The OH2's do eventually
get up to their programmed current, but it might be better to avoid the
excess demand because of wind-up issues with the internal integral gain
in the voltage feedback in the supplies.
Scorecard:
Tests/No power 3
Duds 0
Fizzles 3
Plasmas 21 (20 into rampdown)
============ ==
Shots 27
|
| Session Leader Comments | |||
| May 31 2007 09:00:48:997AM | Jerry Hughes | I'm driving today, on behalf of Ken and Rachael.
RF will probably take a finite number of shots to tune up. Ken is enabling the NINJA puff for shot 1. | |
| May 31 2007 09:06:24:080AM | 1070531001 | Kenneth Marr | NINJA enabled. .4s for 100ms and 1.0s for 200ms. 8psi D2. CXRS 494.4nm B V emission. |
| May 31 2007 09:50:39:603AM | 1070531001 | Jerry Hughes | No power shot. Power supply charging error. |
| May 31 2007 10:12:19:610AM | 1070531002 | Jerry Hughes | No power test. |
| May 31 2007 10:16:03:473AM | 1070531003 | Jerry Hughes | No power test. |
| May 31 2007 11:01:09:910AM | 1070531004 | Jerry Hughes | Shot went off well. RF ran clean as programmed, but outgassed a bit, overfueling
the plasma. EDA H-mode, with RF tripping out. Repeat. Steve will try to improve steadiness of the right and left gap. Fairly substaintial Te pedestal in that first H-mode. A solid 500eV. |
| May 31 2007 10:58:01:050AM | 1070531005 | Kenneth Marr | 1st ninja puff lengthened to 120ms. |
| May 31 2007 11:10:39:260AM | 1070531005 | Jerry Hughes | Better RF on the third tier. Got a steady H-mode at the end. Repeat,
and see if the density comes down. |
| May 31 2007 11:11:21:573AM | 1070531006 | Kenneth Marr | 2nd ninja puff moved earlier to .95s, 200ms. 3rd NINJA puff added at 1.2s for 250ms. |
| May 31 2007 11:33:53:957AM | 1070531006 | Jerry Hughes | Density still a little higher than called for in the flattop, presumably
due to RF outgassing. H-modes don't look as great. Looks like we have sufficient data on all the diagnostics. Time to move on to the higher current. Next shot: Ip=1.2, slightly higher nl04. |
| May 31 2007 11:26:31:390AM | 1070531007 | Kenneth Marr | 2nd ninja puff moved to 0.93 s. |
| May 31 2007 11:47:48:150AM | 1070531007 | Jerry Hughes | Ip=1.2MA, nl04 program is 6e19. RF raises nl04 to 8e19 at the time of transition.
Several H-modes, starting very ELM-free and becoming more EDA as pedestal ne increases. Next shot: Steve will make the flattop earlier, and we will delay the first RF pulse, so we can get a steady L-mode portion at full current. |
| May 31 2007 12:13:37:470PM | 1070531007 | Kenneth Marr | NINJA increased to 12psi. 0.5s for 100ms. 0.93s for 150ms. 1.2s for 200ms. |
| May 31 2007 11:43:35:397AM | 1070531008 | Kenneth Marr | 1st NINJA puff at .5s and 150ms. |
| May 31 2007 12:24:19:383PM | 1070531008 | Jerry Hughes | Ip=1.2MA, nl04=6e19
H-modes, ELM-free |
| May 31 2007 11:58:35:420AM | 1070531009 | Kenneth Marr | AB-LIM added for 3rd puff at 1.2s. |
| May 31 2007 12:27:18:400PM | 1070531009 | Jerry Hughes | Ip=1.2MA, nl04=8e19
H-modes, ELM-free, but longer. Radiated power rise is liesurely, and reasonably high Te pedestal and confinement in the first H-mode. |
| May 31 2007 12:33:33:230PM | 1070531010 | Jerry Hughes | Ip=1.2MA, nl04=8e19
More H-modes, ELM-free. Decent confinement. No Thomson. Next shot: raise density |
| May 31 2007 12:28:45:853PM | 1070531011 | Kenneth Marr | NINJA Changed to 12psi. 0.5s for 95ms. 0.8s for 150ms. 1.2s for 200ms. |
| May 31 2007 12:44:55:860PM | 1070531011 | Jerry Hughes | This is probably all we're going to get at this current.
Next shot: Drop to 1.0MA; keep density the same. Try to get a steady EDA. |
| May 31 2007 12:44:22:407PM | 1070531012 | Kenneth Marr | 2nd Ninja puff reduced to 125ms. |
| May 31 2007 12:56:56:503PM | 1070531012 | Jerry Hughes | Only ~1MW of RF throughout pulse. A few short H-modes. Try again. |
| May 31 2007 01:43:34:130PM | 1070531013 | Jerry Hughes | RF didn't do so well. Edge TS HV was off, and the warnings I tried to institute
earlier didn't get sent to me. |
| May 31 2007 01:54:26:557PM | 1070531015 | Jerry Hughes | Great EDA H-mode. Decent data all around. Drop to 8e19 for next shot. |
| May 31 2007 01:55:28:277PM | 1070531016 | Kenneth Marr | Ninja set to 0.5s for 110ms; 0.8s for 180ms; 1.2 for 200ms |
| May 31 2007 02:21:15:473PM | 1070531016 | Jerry Hughes | 3 H-modes. The last is reasonably steady. R & K are happy. Thomson looks OK.
Drop to 6e19 for next shot. |
| May 31 2007 02:24:49:583PM | 1070531017 | Jerry Hughes | Again, the third H-mode isn't bad. Its colder and more EDA-like.
Next shot: Moving back to low current. Ip=600kA. nl04=8e19. |
| May 31 2007 02:37:27:277PM | 1070531018 | Jerry Hughes | Shot runs as called for, except for RF tripping out starting around 1s.
Ip=600kA. nl04=8e19. Pretty typical low current EDA. Next shot: Try to get a steadier high current point. Call up shot 11, increase target nl04 to 1.2e20. |
| May 31 2007 02:30:54:710PM | 1070531019 | Kenneth Marr | 3rd ninja puff extended to 250ms |
| May 31 2007 02:37:58:027PM | 1070531019 | Kenneth Marr | 1st Ninja puff moved to 0.5s. RF also delayed 100ms to allow flattop to develop. |
| May 31 2007 03:37:43:533PM | 1070531019 | Jerry Hughes | Long delay to address runaway heater problem.
Shot went off: 1.2MA, nl04=1.2e20 RF kind of fizzles out, leaving us with what looks like dithering Ohmic H-modes. Next shot: Repeat, try to improve RF. |
| May 31 2007 03:46:41:740PM | 1070531020 | Jerry Hughes | Fizzle. |
| May 31 2007 04:09:51:500PM | 1070531021 | Jerry Hughes | Many radiative H-modes. Raising density did not help us, relative to shot 11.
Are we wearing off the boronization? Next shot: Same parameters, switch to USN. No guts, no glory. |
| May 31 2007 04:18:32:347PM | 1070531022 | Jerry Hughes | A beautiful USN L-mode, with a bonus sharkfin at the end.
Only got 700kW from E, 0 from D. Yijun says lower the density. Yes, master. Next shot: USN, 1.2MA, nl04=1e20 |
| May 31 2007 04:37:25:947PM | 1070531023 | Jerry Hughes | A beautiful USN L-mode, up to 1.13s, and beyond that we will say no more.
Only 1.6MW of ICRF power is just not enough to get into H-mode in this unfavorable geometry. So, give up, and try to get Rachael some steady H-modes a la shot 15. Next shot: LSN 1MA, nl04=1e20 |
| May 31 2007 04:53:37:563PM | 1070531024 | Jerry Hughes | Fizzle. |
| May 31 2007 05:19:19:540PM | 1070531026 | Jerry Hughes | Fizzle. |
| May 31 2007 05:19:55:620PM | 1070531027 | Jerry Hughes | Almost identical to Shot 25. Exactly what was needed. |
| Physics Operator Comments | |||
| May 30 2007 05:51:04:917PM | Steve Wolfe | Setting up for tomorrow's run. Bring up PCS as from Bill's last shot today. Notice that the dpcs_ftae2 routine that Jason asked to have turned on had disappeared, apparently when they went to upper null. This shot has only the obsolete routine dpcs_ftae in the menu. Remove this, and load up the dpcs_ftae2 procedure and turn it off. May as well keep this one around in case Jason or Joe wants it. I think that the segment 3 setup is from the same shot I want to load, but may as well do everything from scratch. Turn off seg3, turn on seg2 Import seg2 from 1070516005 Change Ip from 0.8 to 0.6MA Change nl04 from 8e19 to 4e19 Change Integ C gate from 0.3 sec to 0.2sec Change seg2 title. Build seg Import seg3 from 1070525013 Change Ip from 0.8MA to 0.6MA Zero Acoil_cur feedforward INteg gate C to 0.2sec Change seg3 title Build seg 3 Save as /home/wolfe/pcs_scratch/*_1070531000 (just for backup) Load into Model Load at 30-May-2007 17:50:29.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Check | |
| May 31 2007 08:18:58:560AM | Steve Wolfe | Continuing setup for MP#483 on 1070531 Bring up PCS and confirm the model still contains the segments I set up yesterday. In segment 1, change waveform on IC_OH2 (wire10) to avoid overvoltage before switch close at -0.7sec: add a point at -0.7,10000; also change initial point to 0.0A from +318A Note PG4=18ms, IC_EF4U=-1315, BR_0=-.0030, RCUR=1000. Change IC_EF4U from -1315 to -1330 Segment#2: Note TF is set at -145kA; SL_PLAN says 5.4T, so change it to -150kA. Segment 3 is already at -150kA. Change Chopper voltage from +100 to 0. (Where does this ancient hack keep coming from?) ZCUR still has funny drop from -.009 to -.015 between 1.2 and 1.5sec. Leave it for now. Also, CLEARIN seems to go from (.003,1.0) to (.005,1.5) for no obvious reason. I suspect they will want this more constant, but leave it for how. Enough for now. Load it. Load at 31-May-2007 08:18:23.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| May 31 2007 09:01:52:483AM | Steve Wolfe | There will be a (hopefully) brief delay while the engineers investigate a fault indication on the OH1 supply. | |
| May 31 2007 09:52:41:450AM | 1070531001 | Steve Wolfe | Shot#1: program says 600kA, 4e19, 5.4T tokamak says ... No power shot. EF1 comm bank not charging. Over 2 minutes in check, so DPCS will time out. |
| May 31 2007 10:08:07:220AM | 1070531001 | Steve Wolfe | Shot#2: No power cycle for test of EF1 comm bank charging |
| May 31 2007 10:14:59:707AM | 1070531003 | Steve Wolfe | Shot#3: Will be another no power cycle for test of EF1 comm bank charging and associated PLC logic. |
| May 31 2007 10:50:30:080AM | 1070531004 | Steve Wolfe | Shot#4: good plasma, cmodws30 froze and I had to reboot. |
| May 31 2007 11:06:06:993AM | 1070531005 | Steve Wolfe | Shot#5: Adjust CLEARIN flat at .003, to try to steady both gaps. Get rid of ZCUR ramp after 1.2sec Leave startup alone, although could use a little more gas. plasma, hmode at 1.24sec. Outer gap still moving out at the end Next: Increase gain on RCUR to try to improve outer gap |
| May 31 2007 11:24:06:530AM | 1070531006 | Steve Wolfe | Shot#6: Increase P gain on RCUR from 6 to 9 at 1.0sec to try to improve outer gap Lower nl04 program from 4 to 3e19. plasma. Rcur is less steady, maybe a little too much gain! Next: back off on RCur gain from 9 to 6.15 again Try putting Integrator A on wire 1 and turning on Integral gain |
| May 31 2007 11:41:20:427AM | 1070531007 | Steve Wolfe | Shot#7: back off on RCur gain from 9 to 6.15 again Try putting Integrator A on wire 1 and turning on Integral gain at 4 from 1.0 to 1.5sec Change of plan- Next go 1.2MA, 0.6e20; IC_EF4U=3000 (from 2000) Turn the Integral gain on RCUR back off, leave RCUR P=6.15 Plasma full length. Three H-modes, all look ELM-free q95~3.4 Want left gap 3mm smaller, maybe bring current up faster |
| May 31 2007 11:53:45:917AM | 1070531008 | Steve Wolfe | Shot#8: left gap 3mm smaller, maybe bring current up faster CLEARIN from .003 to 0.000, RCUR from .6605 to .6590 program IP to 1.2sec at .55s, try to get it there by 0.6; will delay RF and/or NINJA accordingly. Plasma. Ip is up a little sooner. Inner Gap is at 1cm, somewhat less early, may need to readjust before 0.7sec? |
| May 31 2007 12:10:41:440PM | 1070531009 | Steve Wolfe | Shot#9: NL04 from 0.6 to 0.8e20 plasma full length, higher density, still 3 hmodes. stored energy down a little, to 159kJ, RF still ratty. Next: NINJA puff changes, otherwise repeat? |
| May 31 2007 12:23:43:070PM | 1070531010 | Steve Wolfe | shot#10: NINJA puff changes, otherwise repeat? plasma, still 3 h-modes, first maybe a bit longer Next: raise nl04 to 1.0e20 |
| May 31 2007 12:36:08:040PM | 1070531011 | Steve Wolfe | shot#11: raise nl04 to 1.0e20. Drop pg4 from 18 to 17ms Disrupts in rampdown, 1.74sec, 600kA Only two hmodes, slower density rise. Next: Drop current to 1MA, leave nl04 at 1.0e20 (skip USN for now) |
| May 31 2007 12:49:36:970PM | 1070531012 | Steve Wolfe | shot#12: Drop current to 1MA, IC_EF4U from 3000 to 2500A leave nl04 at 1.0e20 Drop pg4 from 17 to 16msec (due to previous late disruption) plasma full length, 1MA, blips and a late H-mode (~1.4sec) RF problems? D faulted out early, E ok. Prf<1MW total Next: repeat? |
| May 31 2007 01:13:19:633PM | 1070531013 | Steve Wolfe | shot#13: repeat? Delay for a camac problem, rebooting camac server cmodws34 |
| May 31 2007 01:31:37:813PM | 1070531013 | Steve Wolfe | shot#13: repeat, hoping for rf and dnb plasma. Still one short H-mode at 0.93sec. RF is worse,this time E faulted out and D stayed on. DNB ran ok next: Try for better RF |
| May 31 2007 01:41:22:880PM | 1070531014 | Steve Wolfe | shot#14: repeat, Try for better RF at slightly lower power plasma full length Nice EDA-ish H-mode (one of it!) starting around 1sec. Only problem is the edge TS hi voltage got turned off when the highways went down. Next: repeat with Thomson. No other (intentional) changes. |
| May 31 2007 01:51:04:383PM | 1070531015 | Steve Wolfe | shot#15: repeat with Thomson. No other (intentional) changes. plasma full length, one long H-mode, looks good to me. Next: decrease density |
| May 31 2007 02:12:50:300PM | 1070531016 | Steve Wolfe | shot#16: decrease density to 8e19 plasma full length, but three h-modes. RF stayed on nicely, last H-mode is more like EDA next: drop nl04 to 6e19 |
| May 31 2007 02:18:14:393PM | 1070531017 | Steve Wolfe | shot#17: drop nl04 to 6e19 plasma, 3 h-modes, third one is most EDA-like Next: Back to 600kA and 0.8e20 |
| May 31 2007 02:34:32:587PM | 1070531018 | Steve Wolfe | Shot#18: Back to 600kA and 0.8e20; drop IC_EF4U back to 2000A plasma full length, short EDA-like H-mode until ~1.1sec RF fails later in pulse. Next: 1.2MA, 1.2e20 |
| May 31 2007 03:04:50:803PM | 1070531019 | Steve Wolfe | Shot#19: 1.2MA, 1.2e20 Import seg2 from shot#11 and raise nl04 to 1.2e20 Delay to reset heater breaker. High TC reading? Looks like there may be a runaway heater near C-port. Cell access to investigate. |
| May 31 2007 03:35:20:360PM | 1070531019 | Steve Wolfe | Shot#19: 1.2MA, 1.2e20 Import seg2 from shot#11 and raise nl04 to 1.2e20 Vessel went to -2C, long delay to chase down possible heater problem which turned out to be an iced up tc cable. Base pressure down below .7e-6 so raise PG4 from 16 to 18msec Load at 31-May-2007 15:21:51.00 to INIT at 15:30 (one hour delay) plasma disrupted in rampdown 1.67sec, 750kA. Hardly any RF. No H-mode. Maybe dithering near ohmic H-mode. Next: ? |
| May 31 2007 03:36:45:347PM | 1070531019 | Steve Wolfe | Shot#19: 1.2MA, 1.2e20 Import seg2 from shot#11 and raise nl04 to 1.2e20 Vessel went to -2C, long delay to chase down possible heater problem which turned out to be an iced up tc cable. Base pressure down below .7e-6 so raise PG4 from 16 to 18msec Load at 31-May-2007 15:21:51.00 to INIT at 15:30 (one hour delay) plasma disrupted in rampdown 1.67sec, 750kA. Hardly any RF. No H-mode. Maybe dithering near ohmic H-mode. Next: drop pg4 back to 16msec because of the disruption. Try again |
| May 31 2007 03:47:24:180PM | 1070531020 | Steve Wolfe | Shot#20: second go at 1.2MA, 1.2e20 drop pg4 back to 16msec because of the disruption. Slow down rampdown clearin to try to prevent EF2's from going to zero, leading to rampdown disruption. Fizzle. Moves in, probably didn't drop pg4 enough. Next: down another msec |
| May 31 2007 04:02:30:620PM | 1070531021 | Steve Wolfe | Shot#21: third go at 1.2MA, 1.2e20 drop pg4 to 15msec while I'm at it, slow down the RCUR rampin as well as the clearin, but then change my mind and put it back. plasma full length, lots of H-modes, nothing steady. RF fair, probably not going to get a steady H-mode at this current. Next: Back to lower current? |
| May 31 2007 04:15:08:783PM | 1070531022 | Steve Wolfe | Shot#22: Upper Null 1.2MA, 1.2e20 ! Go to seg3, copy over NL04, Ip, IC_EF4U, slow down CLEARIN ramp in rampdown. No startup changes. Plasma to 1.8sec, L-mode, marfe in rampdown. E port fine, Dport all faults. Next: drop nl04 to 1.0e20 |
| May 31 2007 04:29:25:633PM | 1070531023 | Steve Wolfe | Shot#23: Upper Null 1.2MA, 1.0e20 Plasma disrupted at 1.2sec, full current disruption. No H-mode. Got RF at 1.6MW. Next: Reload shot 15 (1MA, 1e20 LSN) |
| May 31 2007 04:43:03:060PM | 1070531024 | Steve Wolfe | Shot#24: Import seg2 from 1070531015, drop pg4 to 14 msec, best I can do to try to avoid the post-dis fizz Fizzle. wouldn't quite make it. Almost. Leave pg4 down and hope it's not too low this time. |
| May 31 2007 04:56:17:377PM | 1070531025 | Steve Wolfe | Shot#25: Still trying to get back to 1.0MA, 1.0e20 PG4 still at 14msec (no changes) plasma one H-mode not quite as nice as 15, some small back transitions? Next: try for a repeat with different beam program |
| May 31 2007 05:06:12:803PM | 1070531026 | Steve Wolfe | Shot#26: Try for a repeat PG4 from 14 to 15msec fizzle. Try to get one more. |
| May 31 2007 05:18:37:557PM | 1070531027 | Steve Wolfe | Shot#27: Trying to get background shot for 25 I think the best bet is just to repeat. #26 had early breakdown 4.5ms, rising CIII, Halpha doesn't burn out, then seems to go in; there was some current rise. No changes, cross fingers. Plasma full length. Looks very similar. Startup looks perfect. Chalk one more up to benign neglect. END OF RUN. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:47:38:227AM | Plasma | Bad | EF1 Cap Bank Flt |
| 2 | 10:08:58:783AM | Test | Bad | cap bank test |
| 3 | 10:25:48:057AM | Test | Ok | |
| 4 | 10:38:36:607AM | Plasma | Ok | |
| 5 | 10:58:24:960AM | Plasma | Ok | |
| 6 | 11:14:37:293AM | Plasma | Ok | |
| 7 | 11:33:03:253AM | Plasma | Ok | |
| 8 | 11:47:26:197AM | Plasma | Ok | |
| 9 | 12:03:43:967PM | Plasma | Ok | |
| 10 | 12:18:34:990PM | Plasma | Ok | |
| 11 | 12:31:12:807PM | Plasma | Ok | |
| 12 | 12:44:11:763PM | Plasma | Ok | |
| 13 | 01:22:21:280PM | Plasma | Ok | |
| 14 | 01:35:41:580PM | Plasma | Ok | |
| 15 | 01:48:44:507PM | Plasma | Ok | |
| 16 | 02:01:19:683PM | Plasma | Ok | |
| 17 | 02:14:28:300PM | Plasma | Ok | |
| 18 | 02:27:46:320PM | Plasma | Ok | |
| 19 | 03:30:17:453PM | Plasma | Ok | |
| 20 | 03:42:59:600PM | Plasma | Ok | |
| 21 | 03:56:08:887PM | Plasma | Ok | |
| 22 | 04:10:13:110PM | Plasma | Ok | |
| 23 | 04:24:19:177PM | Plasma | Ok | |
| 24 | 04:37:22:260PM | Plasma | Ok | |
| 25 | 04:50:04:187PM | Plasma | Ok | |
| 26 | 05:02:29:567PM | Plasma | Ok | |
| 27 | 05:14:54:477PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| May 31 2007 09:47:12:417AM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||