| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Amanda Hubbard |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Gary Dekow |
| Engineering Operator Run Comment |
| MP 490: Accessing LHCD in ICRF-Heated L and H modes |
| Session Leader Plans |
| Entered: Aug 16 2007 03:01:39:507PM |
| Author: Amanda Hubbard |
| MP 490: Assessing LHCD in ICRF-Heated L and H-modes :DAY 2
SL: Hubbard/Wallace PO: Wolfe DNB is requested, from at least 0.65 s. (MSE will be unavailable) NINJA disabled to start run, may be used with D2 later. CRYOPUMP will be used for some of the run, should be ready for operation by 10 am. Enable the following gate valves and shutters, assuming no vacuum problems: ECE, VUV, DNB, Z-bolo shutters. Torvac setup: Gate valves open ICRF: Transmitters #1,2 and 4 in RUN ON by 08:30. Will primarily use J-port and E-port, around 1 MW each. For some shots (at least one in each step), will replace E with D-port to document differences. For first shots, ICRF timing 0.7-1.4 s. LHCD: Set up for 90 degree ideal phasing, using latest tables. Turn on at 0.8 s-1.3 s (after H-mode formed, in priniciple). This run follows up on 1070607, which consisted of low power coupling studies, and 1070622, which was plagued by difficulties due to NSTAR changes - these have in principle been rectified. The main goal of today is to combine LHCD with ~ 2 MW of ICRF, for a few different physics conditions, and document both coupling and current drive. In contrast to Tuesday's run, we will stick with a moderate LH power level, around 500 kW, putting a priority on clear LH traces rather than higher power. 1) LSN H-mode, 600 kA. Target 6e19 m-2. Should give lower pedestal density. Load shape from 1070622002, but reduce Ip, ne. (or use more recent). May wish to tweak shape (gap, Ssep) in following shots depending on coupling results. Then repeat with CRYOPUMP on to help J-port, and perhaps reduce neped. 2) LSN H-mode. -800 kA, 5.5 T, small outer gap, target nel 6-7e19 m-2. May tweak target ne depending on H-mode density and character (we want lowest ne that gives fairly steady H-mode). 3) Switch to USN L-mode. 800 kA. Load 1070622017. target 6e19 m-3. 2 MW ICRF on at 0.9 s. LHCD on at 0.7 s, to give ohmic comparison. Keep Cryopump on to control ne rise with ICRF and LHCD. Try reducing target nel on following shots to increase I_LH. For 1-2 shots, try replacing E-port with D-port to document differences in coupling (expect worse R with D) 4) Swept Ssep H-modes. Start with either 600 or 800 kA, depending on LSN results. Load waveforms from eg shot on 1070803. Likely to take some shape development to make gaps suitable for LHCD, which is why this is at the end of the day. But, we expect lower ne H-mode pedestals which could be very good for advanced scnearios. Time permitting, repeat with and without cryopump. |
| Physics Operators Plans |
| Entered: Aug 16 2007 05:22:52:950PM |
| Author: Steve Wolfe |
Physop Plan and Engineering Setup for 17-Aug-2007 MP#490:Assessing LHCD in ICRF-Heated L and H-modes (Day 2.5) SL: Hubbard/Wallace PO: wolfe Engineering setup: ------------------ ECDC overnight in D2, P=2e-4Torr, sweep 44/45/103 20/60 ECDC off by 07:00 AM Check Ground on TF magnet prior to operation in the morning. Power System as on 1070622002 Acoil [+Dtop -Dbot -Jtop +Jbot] Enabled (standard configuration) 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 10psi D2 and leave DISABLED Torvac Gate Valves Open in pulse Enable the following gate valves and shutters, assuming no vacuum problems: ECE, VUV, DNB, Z-bolo shutters. CRYOPUMP will be used for some of the run, should be ready for operation by 10 am. ICRF: Transmitters #1,2 and 4 in RUN ON by 08:30. Will primarily use J-port and E-port, around 1 MW each. For some shots (at least one in each step), will replace E with D-port to document differences. For first shots, ICRF timing 0.7-1.4 s. LHCD: Set up for 90 degree ideal phasing, using latest tables. Turn on at 0.8 s-1.3 s (after H-mode formed, in principle). DNB is requested, from at least 0.65 s. (MSE will be unavailable) NINJA disabled to start run, may be used with D2 later. Physop Plan: ------------ The main goal of today is to combine LHCD with ~ 2 MW of ICRF, for a few different physics conditions, and document both coupling and current drive. In contrast to Tuesday's run, we will stick with a moderate LH power level, around 500 kW, putting a priority on clear LH traces rather than higher power. Conditions requested are: 1) LSN H-mode, 600 kA. Target 6e19 m-2. Should give lower pedestal density. Load shape from 1070622002 seg2 to seg2; Recalulate all magnetics predictors; reduce Ip, ne. May wish to tweak shape (gap, Ssep) in following shots depending on coupling results. Start with cryopump off. Then repeat with CRYOPUMP on to help J-port, and perhaps reduce neped. 2) LSN H-mode. -800 kA, 5.5 T, small outer gap, target nel 6-7e19 m-2. May tweak target ne depending on H-mode density and character (we want lowest ne that gives fairly steady H-mode). 3) Switch to USN L-mode. 800 kA. Import seg 3 from 1070622017. Recalculate magentics predictors; target nl04=6e19 m-2. 2 MW ICRF on at 0.9 s. LHCD on at 0.7 s, to give ohmic comparison. Keep Cryopump on to control ne rise with ICRF and LHCD. Try reducing target nel on following shots to increase I_LH. For 1-2 shots, try replacing E-port with D-port to document differences in coupling (expect worse R with D) 4) Swept Ssep H-modes, using zcur sweep technique as on 1070803; possible starting point is 1070803003, seg 4. Start with either 600 or 800 kA, depending on LSN results. Load waveforms from eg shot on 1070803. Likely to take some shape development to make gaps suitable for LHCD, which is why this is at the end of the day. But, we expect lower ne H-mode pedestals which could be very good for advanced scnearios. Time permitting, repeat with and without cryopump. |
| Session Leader Summaries |
| Entered: Aug 20 2007 12:42:20:907PM |
| Author: Amanda Hubbard |
| MP 490: Assessing LHCD in ICRF-Heated L and H-modes
SL: Hubbard/Wallace PO: Wolfe The main goal of today was to combine LHCD with ~ 2 MW of ICRF, for a few different physics conditions, and document both coupling and current drive. We did in the end meet, and in some respects exceed, this goal after a rather difficult start to the run. The first part of the run (shots 3-12) was devoted to LSN H-modes at 600 kA. Shots 3, 4 were H-modes but rather short and radiative. As suspected, the boronization had been largely worn off by Jerry's run yesterday (which was all USN, this should tell us it isn't just the strike points that matter - we largely knew this). Raising the target slightly, from 6 to 7e19 m-3, gave much longer, steadier H-modes, with nel ~ 1.2e20 m-2 and ne_95~1.7e19 m-3. (Shot 6) Confinement ws, however, not great. We remained with this condition for the next several shots. The best H-mode shot was likely shot 8, with 105 degrees phasing (N// 2.7) to ensure accessibility. LHCD Coupling was generally quite good with J and E port - some trends with edge ne were not fully unexpected, which will be interesting for Greg to analyse. The signatures of current drive (non-thermal ECE, Vloop drops) were however very weak, perhaps not surprising given the relatively high density and low LH power ( ~ 550 kW). There did seem to be hard x-rays - profiles require post-run analysis. On shot 12, 1 MW from D-port was added. Edge density actually rose on this shot, perhaps related to outgassing. The remainder of the run was spent on L-mode plasmas with upper null, for maximum benefit from the cryopump. ICRF and LHCD pulses were again staggered, to get good data with each alone, and combined. In this condition we got better coupling with J alone (2 MW) than with J+E. There were now clear Vloop decreases due to LHCD, both with and without ICRF. Shots 13-16 had target nel 6r19 m-3. Phase was reduced to 90 degrees from shot 16. On most shots, good coupling and few LH trips were seen, with P_LH > 500 kW. A striking phenomenon, seen even more clearly when target nel was reduced to 5e19 (shot 17) and 4e19 (shot 18) was that the non-thermal signatures (ECE, and neuts_hards) were much (5-10X) stronger with the ICRF off. This was the case whether ICRF or LHCD pulses were on first. We wondered if this was a wave interaction effect. However, further experimentation, with target varying and with a small gas puff added near the end of ICRF (shots 20, 21) showed that it is most likely a strong non-linear dependence on electron density (which rises slightly when ICRF is on. Adding a gas puff caused non-thermal to decrease at the end of the ICRF pulse instead. Perhaps the most important aspect of the run was getting good x-ray and Vloop data in comparable density and LHCD conditions with ICRF off and on. Shots 13-21 had 2 MW ICRF, mainly J. For shoth 22, we used D+E and again found worse coupling. Shot 23 used J+E, for 3 MW total and giving ~ 4 keV central Te. It will be interesting to see if and how the Te change affects x-ray profiles. For the final shot (24), we coupled 4 MW ICRF from all antennas. This gave Te0 ~ 5 keV, but caused coupling difficulties and eventually a disruption. These data will contribute to a non-joule milestone for the FY07 campaign and are quite encouraging in that they demonstrate ICRF and LHCD can readily be combined at powers close to the maximum currently available. This will be important for future integrated scenarios experiments. Data should contribute to at least two student theses (Wallace and Schmidt), and APS contributions. |
| Physics Operator Summaries |
| Entered: Aug 17 2007 06:21:09:690PM |
| Author: Steve Wolfe |
Physop Summary for Friday, August 17, 2007
MP#490 LHCD with ICRF-heated L and H-modes
SL: Hubbard
PO: wolfe
EO: Pierson, Fitzgerald, Dekow
The run got off to a slow start due to an erroneous indication that the
ground fault had returned, and subsequent testing. It turned out that the
measurement, which indicated 3.8k, was looking into the PEI supply output.
There were also a number of delays due to computer/data system problems,
at least part of which seemed to have been caused by a Windows Update
on several servers, including sv3.
Once things got going, the machine ran very well, and at least half of the
conditions in the SL run plan were accomplished. We got H-mode, LSN cases at
600kA (condition 1) shots #3-12. The first several H-mode shots were ELM-free and radiative with target density of 6e19, but raising nl04 to 7e19 gave nice steady H-mode targets. The cryopump also performed pretty much as requested, and was used for almost all shots. The original programming was hard up on the
outer limiter, and we increased the gap with good results for both LH
and ICRF.
The second half of the run #13-24 was basically condition 3 of the plan, USN L-mode
with 800kA, and density scanned down from 6e19 to 4e19. This section also
featured lots of variation in relative timing of LH and ICRF, and in ICRF
sources. The LH fast electron generation seems to be very non-linearly
sensitive to density, such that small variations in density during ICRF
and at ICRF turn-off resulted in dramatic changes in hard xrays and ECE
non-thermals. On shots 21 and 22 I programmed a small pg3 puff close to
rf turnoff at 1.2sec to get rid of a density dip, with clear effect on the
non-thermals. This was left in for the last shots, which had higher ICRF power.
We ended up with 19 plasmas, all full length except the last which disrupted
at 1.05sec with a flame from the LH grill and 4MW of ICRF; Matt says
"manganese". The ICRF and LH worked extremely reliably
all day. Mostly we used 2MW from the ICRF, raised to 3 and then 4MW on the last
two shots.
The cryopump also performed pretty much as requested, and was used
for almost all shots. Many shots had early runaways, which I tried to control
with PG4, not very successfully. The last few USN low density shots had
both early runaways and probably hollow current density profiles, with
sawteeth delayed until the ICRF pulse.
We kept a careful eye on the TF ground fault current all day, and there was
no reappearance of the fault.
One shot (10) was lost due to an IGOR/computer failure resulting in a DPCS
timeout, and shot 11 was a dud due to lack of OH's and EF1's, probably related
to the previous snafu. There were also two data system hang No Power shots.
Startups on which we had all the fields were 100%, although I was fighting
early runaways all day.
Scorecard:
-----------
Scanner Tests 1
No plasma shots 2
Duds 2 (IGOR/power systems)
Fizzles 0
Plasmas 19
=========== ==
Shots 24
|
| Session Leader Comments | |||
| Aug 17 2007 10:24:37:483AM | 1070817003 | Amanda Hubbard | First plasma. 5.46 T, 620 kA, target 6.7e19 m-2, CRYO WARM.
ICRF (about 1.6 MW, seems to be a problem with the computed NET power) on at 0.7 secs. We get H-modes, though they are rather short and radiative. LHCD on at 0.8 s. Up to 400 kW, several trips. A big injection at 1.1 s (iron) causes L-modes. Likely the gaps, which were taken from a shot pre the latest flux loop loss, are too small. Next shot: Increase gap. Turn on CRYOPUMP (can't hurt, might help). |
| Aug 17 2007 10:39:42:817AM | 1070817004 | Amanda Hubbard | Repeat with target CRYO COLD and larger gap.
ICRF clean, 2 MW. LHCD clean, 430 kW. Plasma not so clear - 4 brief, rather radiative H-modes, followed by an L-mode. Both phases have quite decent LH coupling (around R=0.2). But, not much effect on Vloop. Next: raise target nel a little to see if H-mode get steadier. We really should have re-boronized... Note: All yesterday's run was USN, which this run is LSN so far. The fact that machine seems dirty rather proves that it is NOT the strike point location that matters for erosion.... |
| Aug 17 2007 11:38:46:433AM | 1070817006 | Amanda Hubbard | Raising the target ne did indeed, as hoped, give much steadier, low ne H-modes (2-3 of them). LH stayed on (1 trip).
No evident current drive or non-thermal ECE, though. Looks like hard x-ray diagnostic is not working - should have seen the non-thermals in current rise. Next shot, leave target alone, try to raise LH power. |
| Aug 17 2007 12:22:31:167PM | 1070817007 | Amanda Hubbard |
Good shot, though we are missing some (LH, ICRF, other) key data. H-modes, last quite steady and low ne (ne_95 1.6e20, nel 1.2e20). 560 kW LH, with a couple trips. Hard x-rays now seem to be working. Little evident current drive, maybe a little change in Vloop at 1.3 s. Next shot, raise phase of LHCD to ensure accessibility (try 105 degrees approximate, N//=2.7, which gives Nacc2.2 at 4 T, ~5 at 5.4 T). |
| Aug 17 2007 12:42:07:737PM | 1070817008 | Amanda Hubbard | Nice steady H-mode. nel 1.2e20 m-2, ne95~1.8e20.
Got clean 570 kW LH at 105 deg. Reflections a little higher. But, not evident CD (or ECE response). Next, in attempt to reduce ne some: - turn off NINJA - Ssep closer to DN Also try to raise LH power a little. |
| Aug 17 2007 01:05:48:300PM | 1070817009 | Amanda Hubbard | Changes not so successful. H-mode density did not decrease notably due to Ssep change, and LHCD tripped out early, likely due to higher reflections
(also P was higher). Go back to conditions of shot 8. And add ~ 1 MW of D-port ICRF at 1 sec to see effect on coupling. |
| Aug 17 2007 03:08:34:947PM | 1070817012 | Amanda Hubbard | Good plasma, another steady (if poor confinement) low ne 600 kA H-mode.
Added 1 MW from D-port at 1 sec, for 3 MW total. Contrary to expectations, ne at grill went UP (perhaps because of outgassing, note D-alpha rise. ) Te0 also increases, to 4 keV. 500 kW LH. Given slow shot rate, we are going to go to L-mode, USN phase of run, where more LHCD is expected. |
| Aug 17 2007 02:28:58:953PM | 1070817013 | Amanda Hubbard | First USN, L-mode shot (going to step 3, skipping 800 kA H-modes for now).
Got 2 MW ICRH, L-mode. nel stays nice and steady, around 6e19 m-2. This gives ne0 1.4 e20 m-3, ne95 6 to 4e19 m-3, much lower than in H-modes.LH coupling not so good, Greg is not sure why. Some trips. But clear non-thermal signatures of fast electrons on ECE, also apparently x-rays. Next shot: Use J only. LH timing to 0.9 secs. |
| Aug 17 2007 02:41:42:643PM | 1070817014 | Amanda Hubbard | Repeat USN L-mode. LH coupling is better with J only - nice 2 MW.
Strong non-thermals, x-rays showing some pile-up. Vloop ~0.58-0.49 V when LH on. |
| Aug 17 2007 02:55:17:650PM | 1070817015 | Amanda Hubbard | Repeat USN L-mode. This time turn LH on first, then ICRF at 0.9 s.
LHCD OK, some trips. Vloop decrease at LH on (in ohmic target). nel 0.7-0.6e19 m-2 - note cryopump is still ON. Cell access to add x-ray shielding. Go to 90 degrees LHCD for next shot. |
| Aug 17 2007 03:27:48:600PM | 1070817016 | Amanda Hubbard | Good. 90 degree LHCD. Turned on LH at 0.7 s, see clear Vloop droop, strong hards.
RF at 0.9 decreases but does not kill hards. Brief ne rise, but pumps out. (cryo still ON, and apparently doing its job). Te0 increases to ! 4 keV. See Vloop rise when LH off at 1.2 s, early and late phases of LH should give nice comparison of RF effect. |
| Aug 17 2007 03:33:21:720PM | 1070817017 | Amanda Hubbard | Good. 90 degree LHCD. Same timing, reduce nel target to 5e19 m-2.
Even stronger hards early in LHCD. Vloop 1.1 to 0.8 V at LH on (ohmic target), 0.84-0.92 at LH off (with ICRF). next shot: Target to 4e19 m-2. |
| Sep 6 2007 04:02:18:643PM | 1070817018 | Amanda Hubbard | Good. 90 degree LHCD. Same timing, reduce nel target to 4e19 m-2.
Even stronger hards early in LHCD - neuts/hards saturate. But again they decrease when ICRF on. (more slowly now). ECE looks similar to neuts_hards. Note clear ne rise at ICRf turnon, 0.4-0.54e19, this time it does not pump out. Next: Reverse order of LH, ICRF pulses to see dynamics, help understand if ne, or a wave interaction, is responsible. Same target. Note: Noticed later that sawteeth start very late (just before LH) on this shot. Locked mode?? |
| Aug 17 2007 04:29:15:413PM | 1070817019 | Amanda Hubbard | target 4e19 m-2. ICRF on first this time. Clear increase in non-thermals when ICRF turns off. Is this a density effect or not?
Repeat with target 5e19. |
| Aug 17 2007 04:33:24:657PM | 1070817020 | Amanda Hubbard | target 5e19 m-2. ICRF on first this time. Once again, a very strong increase in non-thermals when ICRF turns off. But, there is still a transient decrease in ne at the same time; ne recovers in ~100 ms, and ECE signature in particular decreases in anti-correlation. Starting to look like a ne effect.
next shot, add a gas puff late in ICRF to try to smooth out nel. |
| Aug 17 2007 04:36:16:770PM | 1070817021 | Amanda Hubbard | target 5e19 m-2. Adding a gas puff near the end of ICRF pulse. Slightly overdid it, which proved interesting - by increasing nel, both ECE and neuts_hards start to drop BEFORE (and after) end of ICRF. They come up later as ne decreases. So, this seems quite clear evidence the primary effect is density-related. But very non-linear and sensitive!
|
| Aug 17 2007 04:48:45:070PM | 1070817022 | Amanda Hubbard | target 5e19 m-2. Substituting D and E port ICRF for J-port to compare coupling. Steve succeeded in smoothing out the nel at the end of ICRF, much less change in ECE and neuts_hards.
As expected, coupling of LHCD was worse with D and E than J. Some trips as a result. For next shot, use 2 MW J plus 1 MW E. Should either give a nice hot L-mode or a low ne H-mode... |
| Aug 17 2007 05:00:32:070PM | 1070817023 | Amanda Hubbard | Target 5e19 m-2. 2 MW J+ 1 MW E - ran clean. Got a nice hot L-mode, Te0 ~ 4 keV, on YAG as well as ECE. Should be interesting to compare x-ray profiles etc with the ohmic period.
Still getting a strong increase in non-thermals after ICRF, when nel drops. Last shot: all 3 ICRF antennas. |
| Aug 17 2007 05:16:08:340PM | 1070817024 | Amanda Hubbard | For last shot, turned on all 3 ICRF antennas. Got 4 MW nice and cleanly. Stayed L-mode, Te0 ~ 5 keV. Bigger ne rise, 5-7e19 m-2.
But, LH coupler was unhappy, tripped early (0.98 s). And, lit up before a big disruption. Matt says Manganese. Not the kind of LH-ICRF interaction we intended to study... But, we did get lots of good data today on the other kinds (coupling and LHCD efficiencies). |
| Physics Operator Comments | |||
| Aug 17 2007 07:48:53:970AM | Steve Wolfe | Setting up PCS for shots for MP#490 Load from 1070816024 (for startup, last plasma from yesterday) Import seg2 from 1070622002 (LSN) Import seg3 from 1070622017 (USN) Import seg4 from 1070803003 (L-> Zcur sweep) Recall preds 1-8 in seg2; build all; I didn't call 8 (or 11ssep), do those and rebuild. Recall #1-8 in seg3. Also fix Ip offset on wire 12. Turn#2 off/#3 on; build_all - OK #4 should be current. Turn 3 off/4 on and build - OK Turn 4 off/#2 back ON. IN seg2, change Ip to 600kA, NL04=6e19. Note that TF=152kA, 5.5T. I guess that's what she wants, but remember to check. Turn off dpcs_ftae2 In Seg#1, change pg4 puff from 31ms to 20ms (no cryo on shot#1) Note Br0=-.0035, Rcur offset=700, Ic_ef4u=-1335. Leave these. Load it Load at 17-Aug-2007 07:48:41.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| Aug 17 2007 08:06:07:863AM | Steve Wolfe | Change the seg3 and seg4 tf program from -150 to -152kA, so the ped locations don't change in ECE Load Load at 17-Aug-2007 08:05:42.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| Aug 17 2007 08:11:35:187AM | Steve Wolfe | Physop signin gave me a little trouble signing in. On one line it claimed I was already signed in (from yesterday) and another indicated no physop signed in. On the db admin page I changed my entry from 1070816025-027 from Active to Inactive, then it let me sign in for today. Possible bug? Report to Tom. | |
| Aug 17 2007 08:36:38:060AM | Steve Wolfe | Turns out these these shots have the late fizzle and delayed inverts set. Therefore, change the TF waveforms flat to 2sec so we don't have the V-shape current at the end of full shots. Load at 17-Aug-2007 08:36:26.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| Aug 17 2007 09:18:28:160AM | Steve Wolfe | Before first shot, after cooldown: Ground fault has reappeared on the TF. An attempt will be made to zap it. | |
| Aug 17 2007 09:34:10:230AM | 1070817001 | Steve Wolfe | Fault indication is 3.8KOhm, may be an instrumentation issue. Shot#1 will be a no power scanner cycle. |
| Aug 17 2007 09:55:29:343AM | 1070817002 | Steve Wolfe | Shot#2: Previous reported g.f. was due to PEI air switch being left in, so the 3K was looking back into the supply. Now we think we're ready for plasma. I2t fault in INIT, another no power cycle. |
| Aug 17 2007 10:18:25:160AM | 1070817003 | Steve Wolfe | Shot#3: If at first you don't succeed,... Plasma, several h-modes. No ground fault. Outboard limiters are lating up. RF net power seems not be adding both J-ports? Looks like it was really 1.9MW, not 1.4MW EFIT says it is hard limited on outside, dsep~-3mm and I think it is. LH is lighting up after 1.1sec Next: increase outer gap. |
| Aug 17 2007 10:30:49:320AM | 1070817004 | Steve Wolfe | Shot#4: increase outer gap. Reduce RCUR by 2mm .666 to .664. Also, we will have cryopump, so increase pg4 from 20 to 32ms plasma, h-modes. No gf LH is clean, Still lots of moly. EFIT says outer gap is about 1mm going to limit Next: raise nl04 target from 6 to 7e19. |
| Aug 17 2007 10:44:32:340AM | 1070817005 | Steve Wolfe | Shot#5: raise nl04 target from 6 to 7e19. Stcuk in INIT, take a no power shot. |
| Aug 17 2007 10:58:27:140AM | 1070817006 | Steve Wolfe | Shot#6: raise nl04 target from 6 to 7e19. plasma, early runaways. H-modes look better, LH good. No gf Next: raise pg4 to tame the bounce and runaways. |
| Aug 17 2007 12:07:45:873PM | 1070817007 | Steve Wolfe | Shot#7: raise pg4 from 32 to 35ms to tame the bounce and runaways. NINJA will puff at 1.1sec Long delay before this pulse for computer hang (windoez update strikes again!). Also, cell access for Andrea & Greg to fix HXR. Plasma, still a few runaways early, h-modes ok, not great No gf signals. Fast pearson signal looks clean. ICRF data not coming through either. Josh is looking into it. |
| Aug 17 2007 12:32:39:723PM | 1070817008 | Steve Wolfe | Shot#8: raise pg4 from 35 to 37ms DNB has been remotely fixed by Dexter, may be available this shot. More computer problems before this shot. DNB calorimeter is stuck again, go without 'em. Plasma, H-mode. Nice flat density, no runaways, got ICRF, LH. No gf |
| Aug 17 2007 12:48:40:447PM | 1070817009 | Steve Wolfe | Shot#9: Raise zcur by .009 to -.01 to try to get a little pumping, NINJA will turn off for this shot. plasma, not quite as nice, no lower density though Outer gap got small (or zero) again. LH faulting. I think need to drop rcur another mm if we keep this way. SSEP down to -8mm; could go a little higher or drop zcur. NO GF. |
| Aug 17 2007 01:01:28:213PM | 1070817010 | Steve Wolfe | Shot#10: Go back to shape of shot#8 (re-load it) raise pg4 from 37 to 38msec No shot, some kind of IGOR failure. DPCS timed out. Pat's voice took a long time to report the transition to pulse. EO reports some sort of whine from the vicinity of the server rack. |
| Aug 17 2007 01:36:27:033PM | 1070817011 | Steve Wolfe | Shot#11: Go back to shape of shot#8 (re-load it) raise pg4 from 37 to 38msec No LH this shot due to computer failure. No plasma. No OH1,OH2's,EF1's DPCS demands are there for all of them. |
| Aug 17 2007 02:02:41:947PM | 1070817012 | Steve Wolfe | Shot#12: Go back to shape of shot#8 (re-load it) raise pg4 from 37 to 38msec plasma. nice flat density, two step ICRF, LH looks ok, some runaways early. Raise pg4 again? No gf. |
| Aug 17 2007 02:17:52:547PM | 1070817013 | Steve Wolfe | Shot#13:PG4 from 38 to 40ms Move on to upper null, 800kA, 6e19 (segment 3) plasma, L-mode LH has a few drop outs, not bad ICRF steady 2MW. No gf Next shot: enable argon puff |
| Aug 17 2007 02:35:06:197PM | 1070817014 | Steve Wolfe | Shot#14: No PCS changes, use J by itself for ICRF pressure to 1.3e-6 in CHECK, got plasma but I don't think it pumped. good looking L-mode, got 1.9MW from J, Greg says coupling looks better. nl04 closer to 7e19 than 6e19. No gf |
| Aug 17 2007 02:44:30:837PM | 1070817015 | Steve Wolfe | Shot#15: No PCS changes Some runaways early, plasma ok this one had programmed densiity, looks like it pumped no gf. Cell access to add shielding to HXR, which is getting pileup Add two more msec to PG4 |
| Aug 17 2007 03:19:18:273PM | 1070817016 | Steve Wolfe | Shot#16: Pg4 from 40 to 42msec move ip flattop earlier, increase Ip gain between .35 and .65 from 2.6 to 5 plasma, runaways still coming in early, a little worse this time. Lots of LH fast electrons after 0.7s, killed off when ICRF comes in at 0.9 No gf next: keep pushing up on pg4, probably drop nl04 (if SL is ready) |
| Aug 17 2007 03:27:36:553PM | 1070817017 | Steve Wolfe | Shot#17: Pg4 from 42 to 46msec nl04 from 6 to 5e19 plasma, still has a few early runaways! May need to live with it. Big LHCD tail (3e14 neut equivalent) that goes to nothing with ICRF. No gf Next: nl04 to 4e19 |
| Aug 17 2007 03:41:37:450PM | 1070817018 | Steve Wolfe | Shot#18: Pg4 from 46 to 50msec nl04 from 5 to 4e19, get rid of seg3 PG3. plasma, saturation hards during LH before ICRF. No gf |
| Aug 17 2007 03:58:45:057PM | 1070817019 | Steve Wolfe | Shot#19: Pg4 from 50 to 54msec No change in density, going to reverse the timing of the ICRF/LH Plasma, runaways are worse. LH fasts go crazy, big visible synchrotron on video. No gf |
| Aug 17 2007 04:14:53:210PM | 1070817020 | Steve Wolfe | Shot#20: Back Pg4 down from 54 to 48msec, maybe too high? Target back to 5e19 plasma, early hards a little better, similar fast electrons, but no synch rad. Nonthermal ece looks like anti-correlated with small changes in density. Next: put in a small gas puff at 1.1 just before rf turns off no gf |
| Aug 17 2007 04:31:02:963PM | 1070817021 | Steve Wolfe | Shot#21: put in a small gas puff at 1.15 just before rf turns off to try to counter the little drop in density plasma, less fast electron signal Overdid the puff No gf Next: reduce the puff by half and delay a little ICRF will change mix of J and E |
| Aug 17 2007 04:41:54:857PM | 1070817022 | Steve Wolfe | Shot#22:reduce the puff from 50V to 25, and delay to 1.19,end at 1.25 Extend nl04 program from 1.4s to 1.5sec. Tweak current at 0.1sec ICRF will change to D+E, no J Plasma looks good, ICRF ok, couple of LH dropouts early and in the middle Density nice and smooth No gf |
| Aug 17 2007 04:57:25:740PM | 1070817023 | Steve Wolfe | Shot#23: No PCS changes, ICRF will add power Brock will fire a Li pellet in rampdown plasma, No pellet. Fast electrons not saturating EFIT stored energy is negative until 0.5sec or so? Hollow te profile, high li maybe? No gf. |
| Aug 17 2007 05:07:17:970PM | 1070817024 | Steve Wolfe | Shot#24: PG4 from 48 to 50ms Go for more ICRF Plasma disrupts at 1.05sec, big flare out of the LH grill, 3rd row. ICRF ok at 4MW . No Ground fault. Made it through another day. END OF RUN |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:30:54:260AM | Test | Ok | |
| 2 | 09:53:06:683AM | Test | Ok | |
| 3 | 10:08:53:663AM | Plasma | Ok | |
| 4 | 10:23:39:313AM | Plasma | Ok | |
| 5 | 10:43:57:527AM | Test | Ok | |
| 6 | 10:54:19:533AM | Plasma | Ok | |
| 7 | 11:59:33:500AM | Plasma | Ok | |
| 8 | 12:25:11:280PM | Plasma | Ok | |
| 9 | 12:41:39:937PM | Plasma | Ok | |
| 10 | 12:56:24:393PM | Plasma | Bad | IGOR failed, sever crashed |
| 11 | 01:26:49:097PM | Plasma | Bad | No OH1, OH2 and EF1 |
| 12 | 01:57:47:610PM | Plasma | Ok | |
| 13 | 02:11:57:053PM | Plasma | Ok | |
| 14 | 02:25:12:603PM | Plasma | Ok | |
| 15 | 02:39:14:063PM | Plasma | Ok | |
| 16 | 03:08:48:290PM | Plasma | Ok | |
| 17 | 03:22:44:700PM | Plasma | Ok | |
| 18 | 03:35:18:097PM | Plasma | Ok | |
| 19 | 03:50:55:107PM | Plasma | Ok | |
| 20 | 04:06:30:403PM | Plasma | Ok | |
| 21 | 04:20:11:150PM | Plasma | Ok | |
| 22 | 04:35:52:190PM | Plasma | Ok | |
| 23 | 04:48:45:490PM | Plasma | Ok | |
| 24 | 05:01:52:590PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Aug 17 2007 09:30:30:320AM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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| Aug 17 2007 05:40:12:320PM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Launcher moved out to 1905 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||