| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Bill Rowan |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Ed Fitzgerald,Bill Byford |
| Engineering Operator Run Comment |
| MP#265 CXRS Commissioning SL:Rowan PO:Wolf EO:Byford/Fitzgerald |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:31:350PM |
| Author: To Be Determined |
| Session Leader Summary for 1021017 Goal Acquire CXRS spectral data in quiescent discharges to determine limits of present diagnostic configuration. This run will consist of many identical shots and one or two density scans. The questions to be answered are: How far into the plasma can measurements be made? What is the signal attenuation with increasing plasma density? Are the Ti inferences reasonable? CXRS During the last few weeks, CXRS data has been acquired for various discharges. This data is difficult to analyze because of the temporally varying background. This experiment is intended to provide shots which do not have that impediment so that a line shape model can be selected and so that the limits of the measurement can be determined. Beam-induced CXRS spectra were measured in the outer third of the plasma radius. These signals were observed to diminish at the higher end of the density scan. This data will be used with penetration and emission estimates to determine the density limit for the measurement. The spectra are of sufficient quality so that a line shape model can be developed and Ti measured. Beam component mix For a day prior to this experiment, the beam was operated at a high rep rate. After the experiment, the beam component mix measurement was setup and the component mix was measured to be [E, E/2, E/3, E/18] = [0.33,0.12,0.36,0.19] This is an improvement since the last measurement on 10/04/02. Beam operation The beam required repair in the course of the run. This is unusual. A collection of power supply faults was registered by the control program. These would not clear. We have seen this on rare occasions in the past. To clear them, the Budker Institute camac unit was cycled. In the course of this, a second problem developed. A contactor would not close. This is the same charging contactor that caused a loss of beam operation time about two weeks ago. This time, the contactor was made operable by cycling it manually. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:16:583PM |
| Author: To Be Determined |
| Physics Operator Summary for Thursday Oct 17, 2002 MP: 265 CXRS commissioning SL: Rowan PO: Wolfe EO: Byford, Fitzgerald The goal for this run is to acquire CXRS spectral data in quiescent discharges to determine limits of present diagnostic configuration. This run will consist of many identical shots and one or two density scans. The questions to be answered are: How far into the plasma can measurements be made? What is the signal attenuation with increasing plasma density? Is Ti measurement reasonable? Engineering Setup ----------------- Power Systems as on 1021011001 Overnight ECDC in D2 at 2e-4 torr off by 7:00AM Run to begin at 9:00 AM Gas setup: B-Top 6 psi D2 Hybrid Enabled (PG4) B-side lower 1 psi Ar Hybrid Enabled (PG1) B-side upper 10 psi D2 Hybrid DISABLED (PG2, for ECDC) C-Side 30 psi D2 Hybrid Enabled (PG3) J-Bottom as is, Hybrid DISABLED Enable the following gate valves, assuming no vacuum problems: ECE,VUV,DNB RF Setup: None - Ohmic only run PCS Setup ---------- Import seg2 from 1021011001 and change Itf from -153kA to -147.4kA (nominal 5.3T) change nl04 from 8e19 to 6e19. I took seg1 from the last shot from Wednesday, and lowered pg4 to 32msec. I also spent some time fixing up the predictors so they no longer give invalid row message when you try to look at them in EDIT_WIRE|EDIT . This required recalculating the predictors on all wires except RCUR, ZCUR, BR_0 and IC_EF4U; the former I had done yesterday, and the others didn't need it, presumably because those get exercised every day. I believe that these predictors got somehow corrupted by an inadvertent call to the ALGs button on segment #1. This seems to have happened once before, on 1020531013. I had also noticed that using the segment ALGS button caused problems. Physops should avoid the use of this "feature" until the bugs are identified and fixed. See notes in logbook for yesterday and today for more info. Results: -------- A boring run, from the Physop's point of view. The Session Leader seemed happy enough though. We spent most of the day at the initial density of 6e19, then went up to 8e19 (#21), 1e20(#22-24,26-27), back down to 8e19 (#28), and down to 5e19 (#29-3 Startup was pretty robust today, despite the fact that I couldn't resist tweaking at it. I tried using Ian's trick of varying the drawn RCUR point at 0.001 sec. Over several shots I moved this from .69 to .66m, but I'm not convinced it actually did anything. The major control knob continued to be the gas (PG4). I started at 32msec, worked it up as far as 39, then later in the run came back down as far as 30, and then as we lowered the density went back up as far as 37msec on the last shot. The effect on outside bounces and associated runaways was always in the expected direction, though not always as large as I expected for a given change. We had one power supply dud (#9, no TF) and one disruption caused by a TCI feedback failure (#25); that shot seems to have fueled to close to the Greenwald limit. We had one fizzle (#23) due to not lowering the gas enough, leading to a fatal snuff on the inside. The beam behaved reasonably well, although we did lose about an hour after a problem with the control signals and a contactor. The data system was well behaved today, with only one shot held up a few minutes to clear a stuck job. Scorecard: ----------- 32 shots. 30 plasmas. 1 fizzles. 1 duds (no TF) |
| Session Leader Comments | |||
| Oct 17 2002 08:00:07:197AM | Bill Rowan | The goal for this run is to acquire CXRS spectral data in quiescent discharges to determine limits of present diagnostic configuration. This run will consist of many identical shots and one or two density scans. The questions to be answered are: How far into the plasma can measurements be made? What is the signal attenuation with increasing plasma density? Is Ti measurement reasonable? | |
| Oct 17 2002 09:15:10:217AM | 1021017001 | Bill Rowan | 001. Beam is at approximately 50 kV. 50 ms. |
| Oct 17 2002 09:21:59:627AM | 1021017002 | Bill Rowan | 002. 30 ms beam. Otherwise, okay. |
| Oct 17 2002 09:32:29:763AM | 1021017003 | Bill Rowan | 003. Beam did not fire on that shot. Interlock failed to clear. |
| Oct 17 2002 09:52:05:037AM | 1021017004 | Bill Rowan | 004. Beam was 50 ms. Max accelerated current was 4A |
| Oct 17 2002 10:47:13:717AM | 1021017004 | Bill Rowan | Delay due to beam power supply problem. Contactor for charging supply would not close. Cycled contactor by hand and then it began to work. |
| Oct 17 2002 11:01:15:283AM | 1021017005 | Bill Rowan | 005. Beam was fired late. The pulse length was approximately 10 ms. |
| Oct 17 2002 11:08:03:897AM | 1021017006 | Bill Rowan | 006. Beam firec properly. CXRS signals. |
| Oct 17 2002 11:37:54:057AM | 1021017008 | Bill Rowan | 008. Beam faulted. |
| Oct 17 2002 01:31:50:237PM | 1021017016 | Bill Rowan | 016. Beam faulted. 15 ms. CXRS data not usable on this shot. Good measurment of ambient emission. Useful for analysis of other data. |
| Oct 17 2002 01:39:29:130PM | 1021017017 | Bill Rowan | 017. Beam faulted. 15 ms beam. |
| Oct 17 2002 02:11:31:047PM | 1021017018 | Bill Rowan | 018. 50 ms beam. Good current. Good CXRS signal |
| Oct 17 2002 02:10:10:103PM | 1021017019 | Bill Rowan | 019. Beam fault. 12 ms. Not of much use. |
| Oct 17 2002 02:25:26:600PM | 1021017020 | Bill Rowan | 020. 50 ms beam. Adequate current. Good cxrs signal. Next shot. Begin a density scan |
| Oct 17 2002 02:50:38:337PM | 1021017021 | Bill Rowan | 021. 50 ms beam. Good current. nel04 = 8e19 Cxrs signal getting smaller. |
| Oct 17 2002 03:03:00:730PM | 1021017022 | Bill Rowan | 022. 50 ms beam. good current nel04 = 1.1e+20 |
| Oct 17 2002 03:02:07:963PM | 1021017023 | Bill Rowan | 023. 50 ms beam. good current fizzle |
| Oct 17 2002 03:17:20:647PM | 1021017024 | Bill Rowan | 024. Good beam. Good plasma. |
| Oct 17 2002 03:30:09:587PM | 1021017025 | Bill Rowan | 025. Good beam. Plasma density was uncontrolled. Not a useful shot. Detector saturated. |
| Oct 17 2002 03:56:31:547PM | 1021017026 | Bill Rowan | 026. Good beam. Plasma density okay |
| Oct 17 2002 04:04:30:520PM | 1021017027 | Bill Rowan | 027. Good beam. Plasma density okay Next shot. Reduce density. |
| Oct 17 2002 04:19:22:517PM | 1021017028 | Bill Rowan | 028. good beam. Plasma at approximately 8e19 nl Good cxrs signal. |
| Oct 17 2002 04:30:32:903PM | 1021017029 | Bill Rowan | 029. Plasma. nel=5.5e+19 Very short beam. Must try again. |
| Oct 17 2002 04:45:02:880PM | 1021017030 | Bill Rowan | 030. Good beam. Plasma at approximately 5e+19. Good cxrs, of course -- low density. |
| Oct 17 2002 04:57:04:210PM | 1021017031 | Bill Rowan | 031. Good beam at 0.5s. Plasma at approximately 5e+19. Very large signal, but ambient emission was changing rapidly as well. |
| Physics Operator Comments | |||
| Oct 17 2002 07:17:40:447AM | Steve Wolfe | Setting up for Thursday 1021017 run: Import seg2 from 1021011001 and change Itf from -153kA to -147.4kA (nominal 5.3T) change nl04 from 8e19 to 6e19 Seg 1: take setup from last shot Wed and: call alg in all wires except RCUR, ZCUR, BR_0 and IC_EF4U, which didn't need it. the others all gave invalid predictor warning on trying to edit predictor, all had alg_version of 3-FEB-1993 or DUMMY, as on the CLEAR preds in rows 1 and 3 Note that the current versions are : fluxihh : "2-Oct-02 Radial posi... filament: "01-JUN-1993 19:15:00" custom: "today" ` vacuum: "1-FEB-1993 13:01:26" rogowski: "9-FEB-1993 13:01:26" pre-puff pg4 from 35 to 32msec Load/clean Load at 17-Oct-2002 07:05:37.00 Do a coldstart (from claret) All matrices respond. hloader log ok. | |
| Oct 17 2002 07:50:34:703AM | Steve Wolfe | Got a clue on how the seg1 on 1021008008 - 1021016025. Looking at the log from 1020531, where the previous series of "funny" alg_version values originated on shot 13, I see that Ian has a note about having tried to edit the "Rcur controller" and then talks about using the algs button: ---------------------------------------------------------------------------- 1020531012 hutch PHYSICS_OPERATOR May 31 2002 3:09:14:510PM . . . . . . . . . . . . . . . . . . . . Called the Rcur controller. Initially when I tried to edit it, it said I could not because bp26 was wrong. Then after calling it had bp26_bc and could be displayed through edit. Then hit the algs button in segment 1. It seemed to call all the algorithms. There were a few where the scale factor did not satisfy the criterion for all the values, but I ignored that and just hit ok. Load. Call the algorithms for segments 2-4. All ok except for the NL04 factor which I just oked anyway. Load/clean. ------------------------------------------------------------------------------ I have previously noted anomalous behavior when using the segment-wide call_algs button. I suspect that Bill accidentally hit the seg1 call_algs button, and it somehow generated these screwy alg_version values and did something that left the rows in an "invalid" state. I don't understand how the offset=3600. value survived, but maybe that is related to the bug in call_algs? The last shot in the older sequence seems to have been 1020606012. There is no specific information in the logbook, but it looks like that was the shot on which Bob updated the calibration of the replacement BTOR signal (when the real BTOR was MIA), and it may be that Irby, who was physop that day, recalculated predictors, which would have removed the anomaly. | |
| Oct 17 2002 09:14:48:217AM | 1021017001 | Steve Wolfe | Shot#1: Startup like shot 1021016032 except for pg4 at 32msec instead of 35 Seg 2 like 1021011001 with nl4 to 6e19 and itf to -150000 (not 147400, as claimed above) plasma, full length. Some current rise hesitation, no bounce, Br a little negative, so is Bz[0.0] Pressure is .06 to .07mTorr; plenum pressure is 6.3psi today One small injection at .85sec; H/D=.05 No ece signal; No Thomson. next shot: repeat, unless Bill wants something changed |
| Oct 17 2002 09:31:43:137AM | 1021017002 | Steve Wolfe | Shot#2: repeat plasma, full length. some indications of bouncing on the Halpha, slightly faster current rise,some hards TS on this shot, gpc1 still missing Sam will check pre-amps on gpc1- one amplifier was off next shot: repeat |
| Oct 17 2002 09:35:38:883AM | 1021017003 | Steve Wolfe | Shot#3: repeat plasma, full length. Startup is looking bouncier. gpc1 is back, not many hards this time next shot: rcur[0.001] from .69 to .68 |
| Oct 17 2002 09:47:00:617AM | 1021017004 | Steve Wolfe | Shot#4: rcur[0.001] from .69 to .68 plasma, full length, bd slightly late 7msec Br is down close to -.001 at t=0. No obvious bounce, no hards next shot: repeat |
| Oct 17 2002 10:56:28:490AM | 1021017005 | Steve Wolfe | Shot#5: repeat after a cell access for beam (slightly over an hour) plasma full length. bouncy startup again, current turns around. bd back at 5.4msec, br0=-.001 next shot: raise br0 by .5mT |
| Oct 17 2002 11:07:32:880AM | 1021017006 | Steve Wolfe | Shot#6: raise br0 from .0015 to .0020, expect pressure to come up by itself plasma, full length Another bouncer, breakdown back at 7msec; Br did come up next shot: increase pg4 |
| Oct 17 2002 11:20:52:633AM | 1021017007 | Steve Wolfe | Shot#7: increase pg4 from 32 to 34ms plasma full length Still bounced. bd at 6ms, current rise still reversing. next shot: another rcur[.001] tweak |
| Oct 17 2002 11:25:36:363AM | 1021017007 | Steve Wolfe | Shot#7: increase pg4 from 32 to 34ms plasma full length Still bounced. bd at 6ms, current rise still reversing. On shots 6 and 7 I've been getting a message that bp22jk does not begin near zero by 45mT. This is true. I'm wondering whether Ian's Br predictor in the tree, which uses the processed bp's without baseline subtraction, may be getting pulled off by the offsets. This signal does not go to the hybrid, and the actual hybrid predictor for Br0 doesn't use the bp's at all. next shot: another rcur[.001] tweak |
| Oct 17 2002 11:34:21:467AM | 1021017008 | Steve Wolfe | Shot#8: another rcur[.001] tweak from .68 to .67 plasma, full length still bounces, but later, around 15msec, less turnaround. I don't know whether the rcur[.001] is affecting it or the gas is just evolving. next shot: tweak it again |
| Oct 17 2002 11:47:37:033AM | 1021017009 | Steve Wolfe | Shot#9: another rcur[.001] tweak from .67 to .66 dud - no tf. |
| Oct 17 2002 12:03:20:607PM | 1021017010 | Steve Wolfe | Shot#10: rcur[.001] from .67 to .66 plasma full length Still bounces, this time earlier. Less turnaround though. Still lots of hards. next shot: raise pg4 |
| Oct 17 2002 12:19:05:820PM | 1021017011 | Steve Wolfe | Shot#11: raise pg4 from 34 to 36msec plasma full length still bouncing, current turned around again this time. looked like hards on the tv. next shot: more gas igor |
| Oct 17 2002 12:37:55:340PM | 1021017012 | Steve Wolfe | Shot#12: raise pg4 from 36 to 39msec! plasama full length no bounce. startup looks good. pressure is still only ~.08 mTorr or so; Btop piezo may be getting sticky. next shot: no changes |
| Oct 17 2002 12:48:55:353PM | 1021017013 | Steve Wolfe | Shot#13: no changes plasma full length No bounce, slightly faster current rise. next shot: repeat |
| Oct 17 2002 01:02:56:783PM | 1021017014 | Steve Wolfe | Shot#14:repeat plasma full length small injection at .13 sec maybe a small early bounce, but no hards next shot: repeat |
| Oct 17 2002 01:15:14:253PM | 1021017015 | Steve Wolfe | Shot#15:repeat plasma full length no bounce next shot: repeat |
| Oct 17 2002 01:28:20:587PM | 1021017016 | Steve Wolfe | Shot#16: repeat plasma full length next shot:repeat |
| Oct 17 2002 01:40:09:337PM | 1021017017 | Steve Wolfe | Shot#17: repeat plasma full length, startup still ok next shot: repeat |
| Oct 17 2002 01:57:11:070PM | 1021017018 | Steve Wolfe | Shot#18: repeat plasma full length startup still ok next shot: repeat - Bill says one more good beam shot at this density |
| Oct 17 2002 02:10:25:917PM | 1021017019 | Steve Wolfe | Shot#19: repeat - Bill says one more good beam shot at this density plasma full length, breakdown a little late 7msec, br drifted a bit more positive next shot: Bill says we'll need another one. |
| Oct 17 2002 02:23:56:423PM | 1021017020 | Steve Wolfe | Shot#20: repeat - Bill says one more good beam shot at this density plasma full length, bd still around 7msec, br back where it was. next shot: raise density to 8e19 |
| Oct 17 2002 02:36:26:863PM | 1021017021 | Steve Wolfe | Shot#21: raise nl04 from 6 to 8e19 plasma full length, nl4=8.2e19, bd still around 7msec next shot: raise density to 1e20 |
| Oct 17 2002 02:51:00:887PM | 1021017022 | Steve Wolfe | Shot#22: raise nl04 from 8e19 to 1e20 plasma to 1.96sec,nl4=1.05e20 bd back at 5.5msec again. This one hesitated, and swung in a little bit. next shot: repeat, drop pg4 by 2msec |
| Oct 17 2002 03:03:58:233PM | 1021017023 | Steve Wolfe | Shot#23: nl04 at 1e20, seq1 pg4 from 39 to 37msec fizzle. Should have dropped it more. next shot: pg4 to 34msec |
| Oct 17 2002 03:16:26:987PM | 1021017024 | Steve Wolfe | Shot#24: nl04 at 1e20, pg4 from 37 to 34msec plasma to 1.98sec, skight hesitation, no bounce nl4 1.0-1.1e20 next shot: repeat this density once more |
| Oct 17 2002 03:34:11:597PM | 1021017025 | Steve Wolfe | Shot#25: pg4 from 34 to 32msec plasma disrupted at 1.30sec, tci feedback went negative on me, so gas was full on for almost the whole pulse. density got to nl4>3e20 startup is looking like it was close to snuffing, despite reducing the puff; pressure was down to .07mTorr Irby will need a cell access to check on a HeNe next shot: No changes, and hope it goes |
| Oct 17 2002 03:50:33:170PM | 1021017026 | Steve Wolfe | Shot#26: No changes, and hope it goes plasma full length nearly snuffed, swung back in but made it. next shot: repeat the density, lower pg4 a bit more |
| Oct 17 2002 04:18:30:513PM | 1021017028 | Steve Wolfe | Shot#28: nl04 to 8e19 plasma full length, nl4~8.2e19, but it looks like it has about five little L-H-L transitions in flattop! startup looks like previous next shot: 5e19 |
| Oct 17 2002 04:32:25:113PM | 1021017029 | Steve Wolfe | Shot#29: nl04 to 5e19, drop seg2 pg3 maint level from ~20 to ~15 plasma full length, startup similar, less hesitation nl4=5.4e19, Bill wants it lower. next shot: demand to 4.5e19 |
| Oct 17 2002 04:44:10:770PM | 1021017030 | Steve Wolfe | Shot#30: nl04 demand to 4.5e19, redraw pg3 out to 1.5sec plasma full length, but looks like some runaways. It bounced early in startup, time to start raising pg4 again. nl4=4.8e19 next shot: repeat this density |
| Oct 17 2002 04:55:45:207PM | 1021017031 | Steve Wolfe | Shot#31: pg4 from 30 to 34msec, same nl4 program plasma full length, still had runaways. Another early bounce. next shot: raise pg4 again |
| Oct 17 2002 05:08:29:037PM | 1021017032 | Steve Wolfe | Shot#32: pg4 from 34msec to 37msec, same nl4 program plasma, full length, still runaways. That's all folks. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:02:16:560AM | Plasma | Ok | |
| 2 | 09:16:12:017AM | Plasma | Ok | |
| 3 | 09:29:01:100AM | Plasma | Ok | |
| 4 | 09:41:45:540AM | Plasma | Ok | |
| 5 | 10:51:20:663AM | Plasma | Ok | |
| 6 | 11:04:03:870AM | Plasma | Ok | |
| 7 | 11:17:29:827AM | Plasma | Ok | |
| 8 | 11:30:15:627AM | Plasma | Ok | |
| 9 | 11:45:40:887AM | Plasma | Bad | TF did not go |
| 10 | 11:58:37:953AM | Plasma | Ok | |
| 11 | 12:15:55:203PM | Plasma | Ok | |
| 12 | 12:28:29:720PM | Plasma | Ok | |
| 13 | 12:43:15:933PM | Plasma | Ok | |
| 14 | 12:56:24:093PM | Plasma | Ok | |
| 15 | 01:09:38:177PM | Plasma | Ok | |
| 16 | 01:22:57:133PM | Plasma | Ok | |
| 17 | 01:36:10:137PM | Plasma | Ok | |
| 18 | 01:54:03:217PM | Plasma | Ok | |
| 19 | 02:07:09:487PM | Plasma | Ok | |
| 20 | 02:20:03:913PM | Plasma | Ok | |
| 21 | 02:32:53:010PM | Plasma | Ok | |
| 22 | 02:45:48:467PM | Plasma | Ok | |
| 23 | 02:58:41:953PM | Plasma | Ok | |
| 24 | 03:11:40:677PM | Plasma | Ok | |
| 25 | 03:24:42:430PM | Plasma | Ok | |
| 26 | 03:46:45:100PM | Plasma | Ok | |
| 27 | 04:00:05:120PM | Plasma | Ok | |
| 28 | 04:13:24:763PM | Plasma | Ok | |
| 29 | 04:26:37:190PM | Plasma | Ok | |
| 30 | 04:39:41:053PM | Plasma | Ok | |
| 31 | 04:52:40:057PM | Plasma | Ok | |
| 32 | 05:06:02:263PM | Plasma | Ok | |