| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Steve Wolfe |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Bill Parkin,Bill Cochran |
| Engineering Operator Run Comment |
| Begin Plasma Operation After July Shutdown.Wolfe/Granetz/Cochran. |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:24:633PM |
| Author: To Be Determined |
| Plasma Startup (first run since June 2000) SL: wolfe PO: granetz EO: cochran,parkin The main goal of this run is to re-establish plasma operation after the July vent. Once this is done, we will be running standard discharges for the purpose of machine conditioning and for bringing diagnostics back online. RF is not ready to fire today. Yesterday's power system tests were completed successfully, and an initial plasma attempt (1000816029) resulted in a late breakdown. The G-port Ratiomatic gauge was still being worked on this morning. The A-port camera has been reinstalled and is displayed on the monitor at the front of the control room. Results: -------- A problem with the ACCESS CONTROL system delayed the start of the run until after 11:00. The first shot was a short, resistive plasma which disrupted at 0.2sec. After a couple of fizzles, which had very high CII and Z-meter signals, and a few tweaks which may not have made any difference, we got a nearly full length shot on #5, which lasted into rampdown. Shot 5 was followed by a lot of fizzles interspersed with a feq short disruptive shots. These seemed to be characterized by uncontrolled density increases with the gas valve off. The next good shot was 15, which ran to 1.87 sec, essentially full length. Shot 17 was another good, long shot. H/D was high, still at 1.2 on shot 17. Startup seems to have gotten into alternating sequence by the end of the run, which is usually a sign that we are beginning to get the walls cleaned up. Other notable points: The eight RF-limiter BP coils that Joe Snipes put on integrators are giving good data. EFIT was run using these signals for shot 5, results in tree EFIT01_1000817005. A preliminary comparison indicates the new data tends to move the outboard edge in by ~4mm. A mode 7 snap file efit_snap.dat_rfbp is now in the default directory; it specifies EFIT01 as MDS_TREE. The interferometer analysis program stopped working sometime between shot 5 and shot 13. Jim discovered that the wrong channel was being used to determine the end of shot time, and fixed it. The OH2L coax resistance began the day at over 2uOhms, but dropped to less than 0.4uOhm by the end of the day. The G-side Ratiomatic worked after a lot of work in the cell this morning, but the auto-reset feature still isn't working, so it had to be reset manually. Brian and Bruce indicated that there is probably still a flakey connection in the controller as well; they got it to work by tapping it with a screwdriver! Power Systems performed well all day. There were some glitches on other engineering systems, notably the TF scanner. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:11:723PM |
| Author: To Be Determined |
| Physics operator summary for run 1000817: MP ? -- Restart plasma operation after July maintenance shutdown. Session leader: S. Wolfe Physics operator: R. Granetz Engineering operators: B. Cochran/B. Parkin Summary: Typical startup day. After 2 hours of troubleshooting various problems, the run proceeded without further troubles. We got into the familiar plasmas/fizzle/plasma alternating pattern by the end of the day. There were several full length plasmas (5, 15, 17), and Stu Zweben got some good helium images of turbulent edge structures on shots 15 and 17. Scorecard: 7 plasmas 12 fizzles 0 duds 0 tests 0 aborted ---------- 19 total ------------------------------------------------------------------------------- Engineering setup for Thursday, 17 August 2000: Overnight ECDC in D2, stopping 1-2 hours prior to the run. Run begins at 9:00 and ends at 17:00. Power system setup as on 1000816029. Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid enabled leave B-side upper as is Hybrid DISABLED fill C-side with 30 psi of D2 Hybrid enabled leave J-bottom as is Hybrid DISABLED The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV DNB gate valve will be DISABLED today, since the beamline is not under vacuum. ------------------------------------------------------------------------------- Overnight ECDC in D2 was done, stopping 2 hours prior to the run Hybrid coldstart done; no errors found Loaded shot 1000816029 (set up by Jim Irby; 0.8 MA, 5.3 T) ------------------------------------------------------------------------------- The run was delayed nearly 2 hours due to various small problems in the cell (ratiomatic gauge) and with the access control system. Shot 01 -- Plasma, but short shot. Terminated at t=0.19 s. Pressure gauge didn't work. OH2L coax resistance was 2.2 uohms. Initial current rise was rather slow. Next shot: reduce Bz0 (-15 amps on IC_EF4). Reduce nl_04 to 0.5e20 m-2. Shot 02 -- Fizzle. Null looks okay. Pressure reading was >0.08 mTorr. High signals on CII and Tang. Z-meter. OH2L coax = 2.2 uohms again. Next shot: reduce pre-fill puff from 26 to 21 ms. Shot 03 -- Fizzle. Null looks okay. Pre-fill pressure came down to 0.065 mTorr. Next shot: reduce pre-fill some more, reduce Bz0 a little more. Shot 04 -- Fizzle. Everything looks okay. Next shot: reduce RCUR offset in segment 1 from 5500 to 5000, as requested by Steve. Shot 05 -- Plasma. Good shot. Made it halfway down the current ramp. Density was somewhat higher than programmed. The gas valve was actually off for nearly the entire shot. Carbon level at breakdown was half of the previous shot. Next shot: lower pre-fill another 2 ms. Turn off argon. Shot 06 -- Fizzle. Next shot: put pre-fill back to what it was for shot 05. Shot 07 -- Plasma. Terminated at t=0.60 s. Density took off at 0.5 s for no apparent reason. Next shot: reduce pre-fill 2 ms (Steve's request) Shot 08 -- Fizzle. Next shot: put pre-fill back to what it was for shots 05 and 07. Shot 09 -- Fizzle. Next shot: no changes Shot 10 -- Fizzle. Next shot: reduce Bz0 (subtract 15 amps from IC_EF4). Shot 11 -- Fizzle. Null looks okay. Next shot: gas tweak (shorten by 4 ms) <-- Wrong! see next entry. Shot 12 -- Fizzle. Oops! I added 4 ms to the gas puff instead of subtracting 4 ms! Next shot: subtract 8 ms from pre-fill gas puff (now at 15 ms). Shot 13 -- Plasma. Terminated at t=0.34 s. Still has a significant hesitation during the intial current rise. Pressure is reading 0.045 mTorr, but Bruce is not sure if the gauge calibration is still correct. Next shot: reduce pre-fill puff another 2 ms. Shot 14 -- Fizzle. Next shot: put pre-fill puff back to 15 ms. Shot 15 -- Plasma. Full shot. Stu Zweben got some interesting helium images showing blobby structures. Next shot: no changes Shot 16 -- Fizzle. Next shot: no changes Shot 17 -- Plasma. Good shot. nl_04=7.3e19 m-2. Next shot: no changes Shot 18 -- Fizzle (as expected) Next shot: no changes Shot 19 -- Plasma, but short. Disrupted at t=0.32 s. VDE. End of run. |
| Session Leader Comments | |||
| Aug 17 2000 11:11:36:140AM | Steve Wolfe | Plasma Startup (first run since June 2000) SL: wolfe PO: granetz EO: cochran The main goal of this run is to re-establish plasma operation after the July vent. Once this is done, we will be running standard discharges for the purpose of machine conditioning and for bringing diagnostics back online. RF is not ready to fire today. Yesterday's power system tests were completed successfully, and an initial plasma attempt (1000816029) resulted in a late breakdown. The G-port Ratiomatic gauge was still being worked on this morning. The A-port camera has been reinstalled and is displayed on the monitor at the front of the control room. A problem with the ACCESS CONTROL system delayed the start of the run until after 11:00. | |
| Aug 17 2000 11:31:00:247AM | 1000817001 | Steve Wolfe | Shot #1: Plasma attempt. plasma to 190 msec OH2L coax resistance is at 2.2uohm plasma very resistive. Try dropping density. |
| Aug 17 2000 11:57:07:920AM | 1000817003 | Steve Wolfe | Shot#3: fizzle. cii is up to .02 (was ~.006) Need to clean up. OH coax resistance now down to 1.87 |
| Aug 17 2000 12:23:06:950PM | 1000817004 | Steve Wolfe | Shot#4: another fizzle |
| Aug 17 2000 12:43:38:497PM | 1000817005 | Steve Wolfe | Shot#5: tweak rcur offset (5500->5000) plasma to 1.66sec H/D=0.7 |
| Aug 17 2000 01:08:15:717PM | 1000817006 | Steve Wolfe | Shot#6: fizzle. |
| Aug 17 2000 01:22:09:607PM | 1000817007 | Steve Wolfe | Shot#7: short plasma to ~.6sec density takes off at 0.5 sec, possible sharkfin? OH2l coax resistance is now down to 1.33 Earl disabled H/D for this shot to look at his Zeeman BTOR meter. |
| Aug 17 2000 01:56:40:733PM | 1000817008 | Steve Wolfe | Shot#8: fizzle. oh2l resistance now down to .95uOhm. |
| Aug 17 2000 02:00:12:123PM | 1000817009 | Steve Wolfe | Shot#9: fizzle. |
| Aug 17 2000 02:17:36:903PM | 1000817010 | Steve Wolfe | Shot#10: another fizzle. oh2l resistance down to .69uOhms, in range of the others. Cii reaches .025 Bz has crept up a bit. |
| Aug 17 2000 02:35:43:857PM | 1000817011 | Steve Wolfe | Shot#11: fizzle. breakdown is a little earlier oh2l coax now down to .57uOHm, oh2u ~.67 |
| Aug 17 2000 02:52:09:543PM | 1000817012 | Steve Wolfe | Shot#12: and another fizzle. Bob added 4msec to the gas instead of subtracting; oh well, that would have been the next experiment. |
| Aug 17 2000 03:14:42:860PM | 1000817013 | Steve Wolfe | Shot#13: plasma to .45sec, similar to 7 but ends sooner current rise is maybe a little better, still too slow. oh2l coax is down to .396uOhm, now lowest of the three. |
| Aug 17 2000 03:27:55:047PM | 1000817014 | Steve Wolfe | Shot#14: and another fizzle. Can't possibly get two in a row. |
| Aug 17 2000 03:58:11:437PM | 1000817015 | Steve Wolfe | Shot#15: plasma, full length 1.85 sec interferometer signal stops at .2 sec again, like on shot 13. |
| Aug 17 2000 04:10:58:047PM | 1000817016 | Steve Wolfe | Shot#16: fizzle, of course. |
| Aug 17 2000 04:36:38:920PM | 1000817017 | Steve Wolfe | Shot#17: plasma, full length H/D is still 1.2 |
| Aug 17 2000 04:50:52:907PM | 1000817018 | Steve Wolfe | Shot#18: fizzle. Let's take one more and see if they alternate. |
| Aug 17 2000 05:06:16:687PM | 1000817019 | Steve Wolfe | Shot#19: early disruption, .32 sec; the thrash finally got us. Anyhow the startups are now in alternating sequence, so we must be beginning to clean up. |
| Physics Operator Comments | |||
| Aug 17 2000 08:43:10:280AM | Robert Granetz | Engineering setup for Thursday, 17 August 2000: Overnight ECDC in D2, stopping 1-2 hours prior to the run. Run begins at 9:00 and ends at 17:00. Power system setup as on 1000816029. Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid enabled leave B-side upper as is Hybrid DISABLED fill C-side with 30 psi of D2 Hybrid enabled leave J-bottom as is Hybrid DISABLED The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV DNB gate valve will be DISABLED today, since the beamline is not under vacuum. | |
| Aug 17 2000 08:43:32:263AM | Robert Granetz | Overnight ECDC in D2 was done, stopping 2 hours prior to the run Hybrid coldstart done; no errors found Loaded shot 1000816029 (set up by Jim Irby; 0.8 MA, 5.3 T) | |
| Aug 17 2000 01:39:03:153PM | 1000817001 | Robert Granetz | The run was delayed nearly 2 hours due to various small problems in the cell (ratiomatic gauge) and with the access control system. Shot 01 -- Plasma, but short shot. Terminated at t=0.19 s. Pressure gauge didn't work. OH2L coax resistance was 2.2 uohms. Initial current rise was rather slow. Next shot: reduce Bz0 (-15 amps on IC_EF4). Reduce nl_04 to 0.5e20 m-2. |
| Aug 17 2000 11:45:28:687AM | 1000817002 | Robert Granetz | Shot 02 -- Fizzle. Null looks okay. Pressure reading was >0.08 mTorr. High signals on CII and Tang. Z-meter. OH2L coax = 2.2 uohms again. Next shot: reduce pre-fill puff from 26 to 21 ms. |
| Aug 17 2000 11:58:08:390AM | 1000817003 | Robert Granetz | Shot 03 -- Fizzle. Null looks okay. Pre-fill pressure came down to 0.065 mTorr. Next shot: reduce pre-fill some more, reduce Bz0 a little more. |
| Aug 17 2000 12:24:15:280PM | 1000817004 | Robert Granetz | Shot 04 -- Fizzle. Everything looks okay. Next shot: reduce RCUR offset in segment 1 from 5500 to 5000, as requested by Steve. |
| Aug 17 2000 12:41:16:780PM | 1000817005 | Robert Granetz | Shot 05 -- Plasma. Good shot. Made it halfway down the current ramp. Density was somewhat higher than programmed. The gas valve was actually off for nearly the entire shot. Carbon level at breakdown was half of the previous shot. Next shot: lower pre-fill another 2 ms. Turn off argon. |
| Aug 17 2000 01:40:06:950PM | 1000817007 | Robert Granetz | Shot 07 -- Plasma. Terminated at t=0.60 s. Density took off at 0.5 s for no apparent reason. Next shot: reduce pre-fill 2 ms (Steve's request) |
| Aug 17 2000 01:51:28:450PM | 1000817008 | Robert Granetz | Shot 08 -- Fizzle. Next shot: put pre-fill back to what it was for shots 05 and 07. |
| Aug 17 2000 02:04:40:983PM | 1000817009 | Robert Granetz | Shot 09 -- Fizzle. Next shot: no changes |
| Aug 17 2000 02:17:56:467PM | 1000817010 | Robert Granetz | Shot 10 -- Fizzle. Next shot: reduce Bz0 (subtract 15 amps from IC_EF4). |
| Aug 17 2000 02:52:59:793PM | 1000817011 | Robert Granetz | Shot 11 -- Fizzle. Null looks okay. Next shot: gas tweak (shorten by 4 ms) <-- Wrong! see next entry. |
| Aug 17 2000 02:53:09:247PM | 1000817012 | Robert Granetz | Shot 12 -- Fizzle. Oops! I added 4 ms to the gas puff instead of subtracting 4 ms! Next shot: subtract 8 ms from pre-fill gas puff (now at 15 ms). |
| Aug 17 2000 03:13:35:247PM | 1000817013 | Robert Granetz | Shot 13 -- Plasma. Terminated at t=0.34 s. Still has a significant hesitation during the intial current rise. Pressure is reading 0.045 mTorr, but Bruce is not sure if the gauge calibration is still correct. Next shot: reduce pre-fill puff another 2 ms. |
| Aug 17 2000 03:25:45:983PM | 1000817014 | Robert Granetz | Shot 14 -- Fizzle. Next shot: put pre-fill puff back to 15 ms. |
| Aug 17 2000 03:56:42:843PM | 1000817015 | Robert Granetz | Shot 15 -- Plasma. Full shot. Stu Zweben got some interesting helium images showing blobby structures. Next shot: no changes |
| Aug 17 2000 04:14:34:937PM | 1000817016 | Robert Granetz | Shot 16 -- Fizzle. Next shot: no changes |
| Aug 17 2000 04:32:31:717PM | 1000817017 | Robert Granetz | Shot 17 -- Plasma. Good shot. nl_04=7.3e19 m-2. Next shot: no changes |
| Aug 17 2000 04:52:56:607PM | 1000817018 | Robert Granetz | Shot 18 -- Fizzle (as expected) Next shot: no changes |
| Aug 17 2000 05:33:35:140PM | 1000817019 | Robert Granetz | Shot 19 -- Plasma, but short. Disrupted at t=0.32 s. VDE. End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 11:15:19:060AM | Plasma | Ok | |
| 2 | 11:33:54:403AM | Plasma | Ok | |
| 3 | 11:48:24:437AM | Plasma | Ok | |
| 4 | 12:11:38:670PM | Plasma | Ok | |
| 5 | 12:29:22:937PM | Plasma | Ok | |
| 6 | 12:58:31:250PM | Plasma | Ok | |
| 7 | 01:14:27:733PM | Plasma | Ok | |
| 8 | 01:38:53:590PM | Plasma | Ok | |
| 9 | 01:54:29:780PM | Plasma | Ok | |
| 10 | 02:09:10:920PM | Plasma | Ok | |
| 11 | 02:30:28:390PM | Plasma | Ok | |
| 12 | 02:45:19:310PM | Plasma | Ok | |
| 13 | 03:07:04:873PM | Plasma | Ok | |
| 14 | 03:20:50:233PM | Plasma | Ok | |
| 15 | 03:43:44:123PM | Plasma | Ok | |
| 16 | 04:09:29:437PM | Plasma | Ok | |
| 17 | 04:23:04:873PM | Plasma | Ok | |
| 18 | 04:48:41:233PM | Plasma | Ok | |
| 19 | 05:01:29:090PM | Plasma | Ok | |