| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | John Rice,Joseph Snipes |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Andy Pfeiffer,Bill Byford,Ed Fitzgerald |
| Engineering Operator Run Comment |
| MP#415 Rotation and H-mode threshold and possibly MP#404a Alfven damping |
| Session Leader Plans |
| Entered: May 25 2006 02:23:27:030PM |
| Author: John Rice |
| 1.) Revisit USN H-mode discharge: Start with 1060523013. enable B-side lower, with 1 PSI Ar and 2 PSI Ne. ICRF 1.0 MW, 0.7 - 1.2 s. once this discharge is established, recheck H-mode power threshold by increasing/ decreasing incrementally by 100 kW. no DNB unless noise problem is fixed once H-mode power threshold is determined, 2.) Load LSN discharge 1060524012: ICRF 3.0 MW, 0.7 - 1.2 s. once this discharge is established, recheck H-mode power threshold by increasing/ decreasing incrementally by 200 kW. 3.) if time allows, repeat above at 1.0 MA |
| Entered: May 25 2006 03:34:39:017PM |
| Author: Joseph Snipes |
| Run Plan for MP#404a TAE Damping with ICRF Begin with 1060309020 inner wall limited moderate elongation plasmas with nl04 = 9 x 10^19 m^-2, Ip = 0.8 MA, and BT = 5.4 T. Reduce nl04 to 7 x 10^19 m^-2. Sweep the active MHD antennas through the calculated center of the gap TAE frequency multiple times throughout the discharge and look for resonances. From shot to shot slowly increase the ICRF power in steps of 0.25 MW from 0.5 to 1.5 s up to 2.5 MW or until unstable TAEs are observed. Measure the TAE damping rate for each ICRF power level. |
| Physics Operators Plans |
| Entered: May 25 2006 03:42:08:017PM |
| Author: Steve Wolfe |
Engineering setup and Physop run plan for Friday 1060526
MP#415 Rotation and H-mode threshold (reverse field)
and possibly
MP#404a Alfven damping measurements (Reverse field)
SL: MP#415 - Rice
MP#404a - Snipes
PO: wolfe
Overnight ECDC in D2, bake at 60C
Run starts at 09:00 (lockup at 8:30) ends at 17:00
Power system as on 1060523013
Acoil [-Dtop +Dbot +Jtop -Jbot]
Gas setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar + 2 psi Ne Hybrid DISABLED (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3)
leave NINJA as is DISABLED
Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo shutters. DO NOT ENABLE DNB until authorized by Physop.
TORVAC: Gate valves open
FMIT#1,2,3,4 in RUN-ON by 08:30
Physop plan:
-------------
Start from USN 1060523013 (segment 3)
Load 1060524012 seg2 into seg2.
enable dpcs_ftae2 if AMHD system is going to be ready.
Import Joe's shot 1060309020 into seg4 and
flip waveforms and recalculate predictors.
AMHD can troubleshoot and piggyback during MP#415 shots
MP#415 shots:
Start from the USN case in seg3
Let RF tweak power to find threshold
Change to LSN as in 1060524012 (import to seg2)
Find threshold
If there is time, increase current to 1MA and repeat for LSN and USN
If AMHD is working, go to MP#404a:
Begin with 1060309020 inner wall limited moderate elongation plasmas with
nl04 = 9 x 1019 m^-2, Ip = 0.8 MA, and BT = 5.4 T.
Reduce nl04 to 7 x 1019 m^-2.
Sweep the active MHD antennas through the calculated center of the gap TAE
frequency multiple times throughout the discharge and look for resonances.
From shot to shot slowly increase the ICRF power in steps of 0.25 MW from
0.5 to 1.5 s up to 2.5 MW or until unstable TAEs are observed.
Measure the TAE damping rate for each ICRF power level.
|
| Session Leader Summaries |
| Entered: May 26 2006 01:47:41:290PM |
| Author: John Rice |
| The first half of the run was dedicated to MP 415, H-mode power threshold in USN and LSN with reversed plasma current. Shots 1-9 were USN and the power threshold was found to be near 1.6 MW ICRF, with a total input power of 2.2 MW. It appears that that strong neon puffing increases the power threshold. Shots 10-18 were with LSN, and the ICRF power threshold was near 3.4 MW. At slightly lower power, the plasma seemed to be in Super L-mode, with a substantial increase in the electron density (due to the RF) but not actually H-mode. Lowering the target density allowed access to H-mode. These power thresholds were similar were similar to those previously determined with normal plasma current, but LSN and USN switched. |
| Entered: May 26 2006 05:24:24:460PM |
| Author: Joseph Snipes |
| For a half run day with a lot of fizzles, we still managed to get some interesting results out of the damping rate measurement with increasing ICRF power. We have good data for 0, 0.5, 1.5, 2.0, and 2.5 MW which appear to show that the damping rate increases with increasing RF power, which is exactly opposite to the results on JET for n=1 modes. We still need to determine what are the n numbers for these resonances though. The changes Willy Burke made to the active MHD amplifier controller worked pretty well and allowed more resonances to be found. There were still a number of glitches in the amplifier current, but they were much less frequent than before. Surprisingly, the active MHD current seemed to be smoother with increasing RF power! Damping rates started out in the 4 to 5 percent range, but with increasing RF power reached 14 percent. Then, at 2.5 MW, the damping rates decreased again to 3 to 4 percent. We did not try going to 3 MW because the RF was already beginning to fault at 2.5 MW and was not believed would be reliable at 3 MW. So, we returned to zero RF power to get a baseline damping rate without fast ions. The CNPA got good data as well, so we should be able to get an idea of the tail temperatures for most of these shots. More analysis is required to check over the results carefully to be sure they are consistent for different shots. The first half of the day compared USN and LSN plasmas and we have some active MHD data during the Ohmic phases of those discharges, but during the ICRF phases, the 500 kHz beat wave between the D and E antennas makes it difficult to measure damping rates with a sweep through the beat frequency. Initial comparison of USN and LSN did not give a clear trend of the damping with the ion grad B drift direction. More analysis is required to select a particular toroidal mode number if possible. |
| Physics Operator Summaries |
| Entered: May 26 2006 06:08:34:880PM |
| Author: Steve Wolfe |
Phys Op Summary for Friday, 1060526 MP#415 (SL Rice) MP#404a (SL Snipes) PO: wolfe The run started off well and we pretty much completed the upper and lower null threshold run by 1:30PM. The Alfven wave damping experiment was hampered by multiple fizzles, but they did complete an RF power scan. MP#415 began with upper null plasmas (800kA, 5.4T) except that I forgot to drop the segment 1 field back to 5.4 from the 5.9T startup that was being used yesterday. By the time the RF came on it was back down to 5.4, so no harm done, and I fixed it for shot#2. I managed to tune the startup to avoid runaways by tweaking Bz and increasing the RCUR offset to -2000. On shot 5 Alex requested an additional 1 psi of neon in the bside lower plenum. We then experienced several disruptive shots, earlier each time. On shot#8 I disabled the bside-lower and the disruption went away. For subsequent shots, the bside-lower mix was changed to 1psi Argon + 1psi neon, and the plasmas again ran into rampdown. This seems to provide circumstantial evidence that the neon is not a negligible perturbation. The upper null threshold was established by shot 10, and we changed to the lower null. It turned out to be necessary to reduce the density ramp rate and seg2 PG3 program to avoid a marfe in lower null reverse field. As the RF power was increased to try to reach the L-H threshold it became apparent that the density was increasing with RF power in L-mode. This could be an indication of outgassing from J-port, or from somewhere other than the antennas as a result of heating. It was necessary to reduce the ohmic target density in order to match the density during RF with the value from the upper null cases, 0.9 to 1.0e20. H-modes were obtained in LSN on shots 15 and 17. Shot 16 was the only fizzle of the first half of the run, and shot 18 disrupted early because of a power supply fault (OH2L crowbarred). The Alfven damping run began on shot#20 (shot 19 was a no-power shot because of two separate problems with camac Jorway setup values, one on the critical TCI diagnostic.) This portion of the run used limiter L-modes, as planned. The AMHD system had also been piggybacking during the morning, and got some data for both upper and lower null cases, but analysis is complicated by the presence of the 500kHz beat between D&E. The second half used RF from D alone or D+J. The density was reduced from 7e19 to 6e19 to get the best data from VTang's ion tail measurements. These shots were plagued by runaways, and later by fizzles which may have been exacerbated by my efforts to get rid of the runaways. There were 7 fizzles and one runaway-induced short disruption over the span of shots#20-35, including one string of four fizzles in a row. On the plus side, the RF worked flawlessly, so essentially all the shots that ran in this part of the run provided useful data. A scan of RF power from 0.5MW to 2.5MW, plus an ohmic baseline shot, was completed. If we had had one more shot a higher power 3MW case would have been attempted. The between shot analysis seemed to indicate that the damping went through a maximum in the power scan and was getting smaller at 2.5MW. Since the mode is expected to become unstable with sufficient tail ions (more power), the far end of the scan would have been of interest, if the RF could get enough power in with only D+J. Most of the fizzles appeared to be cases of the plasma running outside and bouncing once or twice, and the Bz evolution appeared to be too slow. However, the usual field tweaks, less co-current EF4 and more negative, i.e. outward, Rcur offset, did not seem to help. In the end, the gas-head approach of increasing the pg4 puff seemed to work, though runaways persisted even with 29msec of puff and ratiomatic pressure above .06mTorr. The wall condition clearly was playing a role in this, since nothing close to that high a pressure was necessary during the diverted shots earlier in the day. The starting Bz ended up much less positive (by ~2mT) than ran nicely earlier in the day. It may be that the "right" prescription would have been to try more positive EF4 and let the RCUR offset drive a faster swing through zero to negative values. That's about the only thing I didn't try during this sequence. Scorecard: ----------- No Power 1 Duds 0 Fizzles 8 Plasmas 26 -------- --- Shots 35 |
| Session Leader Comments | |||
| May 26 2006 09:12:14:057AM | 1060526001 | John Rice | USN, 1.0 MW, L-mode |
| May 26 2006 09:24:20:620AM | 1060526002 | John Rice | USN, 1.1 MW, L-mode |
| May 26 2006 09:49:51:023AM | 1060526003 | John Rice | USN, 1.2 MW, L-mode |
| May 26 2006 09:51:29:367AM | 1060526004 | John Rice | USN, 1.4 MW, L-mode |
| May 26 2006 10:08:52:570AM | 1060526005 | John Rice | USN, 1.5 MW, H-mode? |
| May 26 2006 10:23:44:807AM | 1060526006 | John Rice | disrupted |
| May 26 2006 10:38:10:947AM | 1060526007 | John Rice | disrupted |
| May 26 2006 10:54:57:947AM | 1060526008 | John Rice | USN, 1.6 MW ICRF, H-mode |
| May 26 2006 11:09:36:697AM | 1060526009 | John Rice | USN, 1.6 MW ICRF, H-mode |
| May 26 2006 11:30:37:430AM | 1060526010 | John Rice | LSN, 3.0 MW ICRF, L-mode |
| May 26 2006 11:39:08:760AM | 1060526011 | John Rice | LSN, 3.0 MW ICRF, L-mode |
| May 26 2006 11:55:20:663AM | 1060526012 | John Rice | LSN, 3.0 MW ICRF, Super L-mode |
| May 26 2006 12:08:02:557PM | 1060526013 | John Rice | LSN, 3.2 MW ICRF, Super L-mode |
| May 26 2006 12:20:12:120PM | 1060526014 | John Rice | LSN, 3.4 MW ICRF, Super L-mode |
| May 26 2006 12:31:03:383PM | 1060526015 | John Rice | LSN, 3.4 MW ICRF, lower density target, H-mode |
| May 26 2006 01:12:32:197PM | 1060526016 | John Rice | fizzle |
| May 26 2006 01:00:02:180PM | 1060526017 | John Rice | LSN, 3.2 MW ICRF, lower density target, H-mode |
| May 26 2006 01:12:46:213PM | 1060526018 | John Rice | early disruption |
| May 26 2006 01:41:02:807PM | 1060526019 | Joseph Snipes | Turned over the run to MP404a Active AE Damping with ICRF. Start with inner wall limited plasmas like 1060309020 but with nl04 = 7 x 10^19 m^-2 to have more of a fast ion tail when we do add RF later. This shot will be without RF as a baseline. Lower Hybrid tree error caused us to lose the shot. |
| May 26 2006 02:35:25:227PM | 1060526021 | Joseph Snipes | Shot 21: Repeat at nl04 = 6 x 10^19 m^-2 to improve fast ion tail and CNPA data. q_AE set to 1. |
| May 26 2006 02:36:01:680PM | 1060526022 | Joseph Snipes | Shot 22: Set q_AE = 1.5. D-port ICRF only at 0.5 MW. Good shot. |
| May 26 2006 02:36:18:413PM | 1060526023 | Joseph Snipes | Shot 23: Fizzle! |
| May 26 2006 02:51:45:273PM | 1060526024 | Joseph Snipes | Shot 24: D port RF set to 1 MW. Good shot. q_AE = 1.5. |
| May 26 2006 03:37:40:960PM | 1060526025 | Joseph Snipes | Shot 25: Combining D and J to get 1.5 MW. Disrupted early. |
| May 26 2006 03:37:53:337PM | 1060526026 | Joseph Snipes | Shot 26: Fizzle. |
| May 26 2006 03:38:40:633PM | 1060526027 | Joseph Snipes | Shot 27: Good shot with 1.5 MW with D and J antennas. |
| May 26 2006 03:40:58:460PM | 1060526028 | Joseph Snipes | Shot 28: Fizzle. |
| May 26 2006 04:13:34:350PM | 1060526029 | Joseph Snipes | Shot 29: Fizzle! |
| May 26 2006 04:13:57:427PM | 1060526030 | Joseph Snipes | Shot 30: Fizzle! |
| May 26 2006 04:14:27:927PM | 1060526031 | Joseph Snipes | Shot 31: Fizzle! |
| May 26 2006 04:41:39:803PM | 1060526032 | Joseph Snipes | Shot 32; Good shot. Got 2 MW of RF. Looks like TAE damping is increasing with RF power!? |
| May 26 2006 04:41:57:757PM | 1060526033 | Joseph Snipes | Shot 33; Good shot. Got 2.5 MW of RF. Looks like TAE damping is still increasing with RF power!? |
| May 26 2006 05:01:14:100PM | 1060526034 | Joseph Snipes | Shot 34; Try no RF baseline to see if damping decreases again. Fizzle |
| May 26 2006 05:01:55:680PM | 1060526035 | Joseph Snipes | Shot 35; Try no RF baseline to see if damping decreases again. Got the baseline shot. Good shot. |
| Physics Operator Comments | |||
| May 26 2006 07:48:57:743AM | Steve Wolfe | Setting up for 1060526 run. I'll start off using the development edition of the new PCS GUI, since it has some features that almost do what I need to do. Import seg2 from 1060524012 (LSN) and turn off Import seg3 from 1060523013 (USN) and turn on (I think it's the same as what I've got, but do it anyway). Turn on seg3. Load/Clean, just so it's there in case I screw up the next part. Load at 26-May-2006 07:33:14.00 Import seg4 from 1060309020,seg2. It says "0.8MA,5.4T, limited" All_P's: flip ef2byef4,ic_ef4u,ip v01-16: flip wires 1-9,11,12 (not Acoil or gas valves recalc preds:rcur,zcur2,zcur3,clearin,rxl,zxl,rxu,zxu Title to "+0.8MA ..." Load/noclean (save it) Build seg4; get one factor popup Build seg2: no messages Back to seg4: Load b21_proj to wire 9 integrator C gate from 0.5 to 0.3sec V1-16: zero acoil_cur (from 2000A) Build. Load/Clean Load at 26-May-2006 07:48:36.00 | |
| May 26 2006 07:57:30:977AM | Steve Wolfe | Continuing setup for 1060526. Bring up v17-32 screen for seg4. There is a waveform in output_17 from the last AMHD run. This gets loaded in INIT (and may be a design problem). It shouldn't hurt, but I'll zero it anyway. Note: I should add a zero option to the popup menu in edit_V2 While I'm at it, open the other v17 windows. Some haven't been updated to recognize the gasjet trigger yet. Apply all of them. Load/Clean Load at 26-May-2006 07:57:16.00 | |
| May 26 2006 08:08:58:603AM | Steve Wolfe |
Continuing setup for 1060526.
Now for the new stuff. I want to go ahead and
install the dpcs_ftae2 routine, and get rid of
the old dpcs_ftae routine. The pieces of code to
do this from PCS aren't ready for primetime, but
I'll use them anyway and see how badly they do.
Under TEST_PROS, choices are dpcs_ftae,dpcs_jet_trigger,new
Select "NEW".
In AddProcedure popup,
select dpcs_ftae and click "REMOVE"
select dpcs_ftae2 and click "ADD"
Dismiss.
Load/Clean
Load at 26-May-2006 08:03:43.00
of course the TEST_PROS button won't have changed, since
I haven't written that code yet. I'll need to exit PCS and
get back in to see it.
First, bring up a traverser and check the model.
\HYBRID::TOP.DPCS.LOADABLES.PROCEDURES:TEST_PROS:PROCEDURE_01
is turned ON and contains "dpcs_ftae2"
PROCEDURE_2 still has dpcs_jet_trigger and is off
PROCEDURE_3 is blank and is off
That worked, except that it should probably be OFF by
default after inserting?
Quit PCS and reinvoke (without /nocopy)
Note that the TEST_PROS menu has changed properly.
| |
| May 26 2006 08:28:47:540AM | Steve Wolfe | Now to test the dpcs_ftae2 routine in the live system ~$ cd /usr/local/cmod/codes/dpcs Irby reports problem taking a test shot, but try anyway: in IDL IDL> test_init_ftae,1060526101 Seems to have run, I have output on amhd_freq and amhd_freq_0 (outputs 17 and 18). There are some error messages in the logfile, probably related to dpcs_fizzle since engineering pulse file is not created by the test pro. Looks like dpcs_ftae2 ran ok. No missed samples. OK, program is probably working. Now use PCS to turn it back off. TEST_PROS | dpcs_ftae2 | click Off then OK. Load/Clean Load at 26-May-2006 08:26:09.00 Check in the traverser. Node is now off. OK, aside from the fact that the TEST_PROS menu will still show dpcs_ftae2 in boldface, it's ready to go under PCS control. | |
| May 26 2006 08:48:31:540AM | Steve Wolfe | John's opening shot looks like it is programmed for quite high density (1.05e20) and gets there too fast (.3sec) The original shot seems to have made it without too bad a marfe, but it's a concern. At least the current rise for this case is programmed fast, which probably helps. Argon/Neon puff is at 50msec. Br0 is at 0 PG4 is 20ms EF4 is 1340 RCUR offset=-1200 No reason to change these yet. Ready to go, I think. | |
| May 26 2006 08:55:49:853AM | Steve Wolfe | Turn dpcs_ftae2 on for first shot Load/Clean Load at 26-May-2006 08:55:16.00 | |
| May 26 2006 09:14:45:820AM | 1060526001 | Steve Wolfe | Shot#1: plasma to 1.74sec No runaways, just a hint of a marfe around 0.3sec D&E ok, 1MW total no J. No H-mode. NL04 just under 1.0 during RF. Bz looks too positive, some bounciness(?) in startup Got outputs on AMHD output channels, center freq claims to be ~700kHz. I still had 165ka on the TF in seg1, leftover from yesterday. Fix that. Next shot: repeat with more RF, keep an eye on Bz |
| May 26 2006 09:24:32:477AM | 1060526002 | Steve Wolfe | Shot#2: Drop seg1 tf back to 150kA (I'd left it from yesterday!) otherwise repeat with more RF, keep an eye on Bz LH will try to fire at the end of RF pulse. Plasma to 1.7sec, marfe a little worse; still no H-mode at 1.1MW Bz still looks high, no runaways but long hesitation; leave it for now. Pressure at t=0 is coming up, around .05 this time. I'm getting the b22_jk not begin near zero error each shot. This seems to be a digitizer problem; it's between 40 and 50mV. Next: repeat |
| May 26 2006 09:39:00:807AM | 1060526003 | Steve Wolfe | Shot#3:No PCS changes, rf will raise power plasma to 1.6sec only. Got some runaways early this shot, bounces in startup. No H-mode, maybe just a hint of dithers. Next: ef4 down 10A, tweak rampdown a little. |
| May 26 2006 09:51:56:087AM | 1060526004 | Steve Wolfe | Shot#4: ef4 from 1340 to 1330, tweak clearin rampdown a little slower. plasma, lasted longer (1.8) but runaways worse. Multiple bounces in startup; Density rise during rf doesn't look like an h-mode but maybe in a dithery state (halpha fuzz). Next: rcur offset from -1200 to -1600, more rampdown tweak |
| May 26 2006 10:08:39:227AM | 1060526005 | Steve Wolfe | Shot#5: rcur offset from -1200 to -1600, reduce clearin rampdown more. Add 1psi Neon to bside-lower per aic request Load at 26-May-2006 09:54:32.00 plasma disrupted earlier, looks like an injection around .13sec took a small bite out of Ip. Something coming in around 1.32sec too. Possible very marginal dither-H transition at 0.807sec trips rf briefly. next: rcur offset to -2000 |
| May 26 2006 10:25:47:523AM | 1060526006 | Steve Wolfe | Shot#6: rcur offset from -1600 to -2000 early disruption, .71sec, injection or something starts at .66, before the RF. Gaps look ok. Startup looks good, no hesitation, although the initial Bz still looks too positive. next: repeat. I'm suspicious of the extra neon in bside-lower if we get another disruption I'm going to drop their puff. |
| May 26 2006 10:44:39:883AM | 1060526007 | Steve Wolfe | Shot#7: repeat. I'm suspicious of the extra neon in bside-lower if we get another disruption I'm going to drop their puff. Another disruption, around 0.45sec this time. The marfe is worse. Prad starts taking off around .35 to .4sec It looks like we're heating something up, or maybe it's the neon. Next shot: Bside-lower off, fill NINJA per KMarr, but don't fire it. |
| May 26 2006 10:55:20:103AM | 1060526008 | Steve Wolfe | Shot#8: Bside-lower off, fill NINJA per KMarr, but don't fire it. No PCS changes this time. See if turning off argon/neon changes things. Else, we can try decreasing the early pg3 puff in seg2 Plasma full length. H-modes at 1.6MW A one-data-point correlation. Next shot: B-side lower to 1psi Argon+1psi Neon and enable. Also NINJA will fire. |
| May 26 2006 11:09:39:820AM | 1060526009 | Steve Wolfe | Shot#9: B-side lower to 1psi Argon+1psi Neon and enable. Also NINJA will fire. Plasma full length, h-modes, marfe or injection before rf one at .13sec, one at .52sec, survived both Data system is hanging. Next: on to LSN case (seg2) |
| May 26 2006 11:28:25:867AM | 1060526010 | Steve Wolfe | Shot#10: on to LSN case (seg2), copy nl04 and ip traces from seg3 to seg2 copy pg3 and pg2 traces from seg3 to seg2 hand tweak the clearin rampdown. Turn off seg3 turn on seg2 plasma full length, marfe from .4 to .77sec 3MW (on and off), no Hmode, density is up during rf, probably from marfe plus antenna fueling. Next: try dropping pg3 in seg2 between .25 and .4sec |
| May 26 2006 11:40:01:947AM | 1060526011 | Steve Wolfe | Shot#11:try dropping pg3 in seg2 between .25 and .4sec NINJA had not been enabled previously, will fire this time plasma full length, injections better but not gone, Marfe no different, density still too high. next: turn off pg3 in seg2 entirely, slow down nl04 program. |
| May 26 2006 11:56:40:710AM | 1060526012 | Steve Wolfe | Shot#12: turn off pg3 in seg2 entirely, slow down nl04 program, reduce from 1.05 to 1.0e20 plasma full length, marfe is gone, still no Hmode density rising during RF due to antenna outgassing? Before rf, nl04 is only .9e20 next: put nl04 program back to 1.05e20 |
| May 26 2006 12:08:17:930PM | 1060526013 | Steve Wolfe | Shot#13: put nl04 program back to 1.05e20 plasma full length, still L-mode, 3.2MW still no marfe, density a little low before rf but still rising during rf next: repeat with more power |
| May 26 2006 12:21:30:213PM | 1060526014 | Steve Wolfe | Shot#14: repeat with more power plasma to 1.87sec, still L-mode, 3.5MW nl04 still increasing to 1.3e20 during RF. We seem to have a lot of gas coming off the antenna. next: reduce nl04 program by 15% |
| May 26 2006 12:33:18:087PM | 1060526015 | Steve Wolfe | Shot#15: reduce nl04 program from 1.05 to .90e20 Load at 26-May-2006 12:22:58.00 plasma, h-modes. next: reduce rf power to bracket the threshold. |
| May 26 2006 12:50:26:337PM | 1060526016 | Steve Wolfe | Shot#16: reduce rf power to bracket the threshold. fizzle. Big lumps on the Halpha, starting around 9msec, strong current rise, then dies. pressure and fields look the same, bz a little less positive early next: ef4 back to 1340 |
| May 26 2006 01:00:22:290PM | 1060526017 | Steve Wolfe | Shot#17: ef4 back to 1340 from 1330 plasma full length, h-modes next: one more on MP#415, lower rf to bracket threshold |
| May 26 2006 01:16:07:820PM | 1060526018 | Steve Wolfe | Shot#18: one more on MP#415, lower rf to bracket threshold Early disruption, PF crowbar. Disrupts at .545sec, caused by oh2L crowbar at .469sec Next: Move on to the Alfven run, start with limiter discharge in seg4. |
| May 26 2006 01:37:09:307PM | 1060526019 | Steve Wolfe | Shot#19: Move on to the Alfven run, start with limiter discharge in seg4. Turn off seg2 on seg4, drop density to 7e19 CAMAC arming error on TCI need to abort |
| May 26 2006 01:56:08:477PM | 1060526020 | Steve Wolfe | Shot#20: Move on to the Alfven run, start with limiter discharge in seg4. Try again. TCI reset JORWAY setting, LH tree set noinclude plasma full length, looked limited lots of little injections, rf firing late for tuning, just under 1MW from D&J, clean pulses. Got an oh coax resistance warning; dpcs_fizzle can't help on a crowbar! next: reduce nl04 to 6e19 |
| May 26 2006 02:05:24:870PM | 1060526021 | Steve Wolfe | Shot#21: reduce nl04 from 7e19 to 6e19 Early runaways, one bounce in startup. Disrupted at 1.63sc, possible locked mode in rampdown. Next: raise pg4 |
| May 26 2006 02:17:24:353PM | 1060526022 | Steve Wolfe | Shot#22: raise pg4 from 20 to 23ms plasma, still some early runaways Didn't load the gas change! J didn't fire, only got 0.5MW Next time: pg4 from 20 to 23ms |
| May 26 2006 02:28:52:383PM | 1060526023 | Steve Wolfe | Shot#23: raise pg4 from 20 to 23ms Load at 26-May-2006 14:17:13.00 fizzle. Maybe I shouldn't have added gas. Looks like an injection at .011sec on halpha; no bounce. I think it was a random flake. next: ef4 to 1335, pg4 to 22msec |
| May 26 2006 02:41:30:227PM | 1060526024 | Steve Wolfe | Shot#24:ef4 from 1340 to 1335, pg4 from 23 to 22msec plasma, but lots of runaways. No obvious bounces though. 1MW of RF this time. next: pg4 back up to 23ms |
| May 26 2006 02:56:53:273PM | 1060526025 | Steve Wolfe | Shot#25:pg4 from 22 to 23ms runaway shot. big injection at .345 kills the current. next: increase pg4 to 26msec, pg3 in seg2 |
| May 26 2006 03:07:50:960PM | 1060526026 | Steve Wolfe | Shot#26:pg4 from 23 to 26ms, pg3 increase in seg1 and before .25sec in seg4 fizzle. This one looks like too much pg4 next: pg4 back to 24msec |
| May 26 2006 03:21:20:010PM | 1060526027 | Steve Wolfe | Shot#27:pg4 from 26 to 24, still increased pg3 before .25sec plasma no runaways one small injection .83sec RF from D+J 1.5MW next: repeat |
| May 26 2006 03:31:27:523PM | 1060526028 | Steve Wolfe | Shot#28: repeat fizzle. need to drop the gas and hope the runaways stay away. |
| May 26 2006 03:44:26:820PM | 1060526029 | Steve Wolfe | Shot#29: pg4 from 24 to 22ms, rcur offset from -2000 to -1800 Br0 from 0 to .0002 Fizzle again. This time it bounced! |
| May 26 2006 03:58:52:903PM | 1060526030 | Steve Wolfe | Shot#30: rcur offsetfrom -1800 to -2200 pg4 from 22 to 23ms fizzle, bounced again. Looks a lot like 29 Raise pg4 again |
| May 26 2006 04:10:37:457PM | 1060526031 | Steve Wolfe | Shot#31: pg4 from 23 to 25msec. If this doesn't work put br0 back to 0, more negative on ef4 Another fizzle. still seems to be bouncing outside. Bz is not rising fast enough. Br0 back to 0, EF4 to 1325 |
| May 26 2006 04:29:42:427PM | 1060526032 | Steve Wolfe | Shot#32: Br0 back to 0, EF4 to 1325 raise pg4 to 27msec plasma, some runaways but at least it ran! slight bump on the halpha, no bounce but swings outside Bz still not ramping very fast compared to Ip Got 2MW clean from D+J |
| May 26 2006 04:39:19:333PM | 1060526033 | Steve Wolfe | Shot#33: No pcs changes, raise power plasma, runaways worse, saturated before the RF bounced once and survived. 2.5MW clean until 1.35sec Bz is not ramping fast enough. Do I have the right direction on the rcur offset? next: No pcs change, rf off for baseline case |
| May 26 2006 04:47:48:863PM | 1060526034 | Steve Wolfe | Shot#34: No pcs change, rf off for baseline case fizzle bounced twice. raise pg4? |
| May 26 2006 05:00:18:757PM | 1060526035 | Steve Wolfe | Shot#35: pg4 from 27 to 29ms; I can't believe the gas needs to be this high, but I don't understand why the Bz is not ramping up faster plasma with runaways, disrupted at 1.65sec At least it ran and Joe and Jason got there no RF case to complete the scan. End of Run |
| May 26 2006 06:11:58:803PM | 1060526035 | Steve Wolfe | After the last shot #35, turn off dpcs_ftae2 using the PCS screen interface. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:02:04:023AM | Plasma | Ok | |
| 2 | 09:16:43:010AM | Plasma | Ok | |
| 3 | 09:32:22:807AM | Plasma | Ok | |
| 4 | 09:47:03:913AM | Plasma | Ok | |
| 5 | 10:00:51:370AM | Plasma | Ok | |
| 6 | 10:15:35:227AM | Plasma | Ok | |
| 7 | 10:35:15:413AM | Plasma | Bad | Disruption PF breaker open OH1 self powered |
| 8 | 10:49:47:883AM | Plasma | Ok | |
| 9 | 11:02:14:337AM | Plasma | Ok | |
| 10 | 11:22:51:447AM | Plasma | Ok | |
| 11 | 11:35:46:773AM | Plasma | Ok | |
| 12 | 11:51:28:663AM | Plasma | Ok | |
| 13 | 12:04:01:040PM | Plasma | Ok | |
| 14 | 12:16:32:633PM | Plasma | Ok | |
| 15 | 12:28:56:663PM | Plasma | Ok | |
| 16 | 12:43:34:477PM | Plasma | Ok | |
| 17 | 12:55:59:430PM | Plasma | Ok | |
| 18 | 01:08:29:900PM | Plasma | Ok | |
| 19 | 01:33:57:100PM | Plasma | Bad | No Power TCI |
| 20 | 01:46:23:850PM | Plasma | Ok | |
| 21 | 01:59:39:087PM | Plasma | Ok | |
| 22 | 02:12:03:743PM | Plasma | Ok | |
| 23 | 02:24:30:273PM | Plasma | Ok | |
| 24 | 02:36:57:743PM | Plasma | Ok | |
| 25 | 02:51:22:993PM | Plasma | Ok | |
| 26 | 03:03:51:557PM | Plasma | Ok | |
| 27 | 03:16:20:320PM | Plasma | Ok | |
| 28 | 03:28:49:180PM | Plasma | Ok | |
| 29 | 03:41:21:273PM | Plasma | Ok | |
| 30 | 03:53:47:190PM | Plasma | Ok | |
| 31 | 04:06:11:190PM | Plasma | Ok | |
| 32 | 04:18:35:210PM | Plasma | Ok | |
| 33 | 04:31:03:990PM | Plasma | Ok | |
| 34 | 04:44:39:130PM | Plasma | Ok | |
| 35 | 04:57:02:570PM | Plasma | Ok | |