| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Brian Labombard,Steve Wukitch |
| Physics operator(s): | Ron Parker |
| Engineering operator(s): | Gary Dekow,Bill Cochran |
| Engineering Operator Run Comment |
| MP 268 ICRF Commissioning and MP 276 Trans/Burping. Wukitch/Parker/Cochr |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:24:633PM |
| Author: To Be Determined |
| Engineering setup for Tuesday, 1000823: Overnight ECDC in D2, stopping 1-2 hours prior to the run. Run begins at *** 10:00 *** NOTE!!! (It could be later, depending on success of RF conditioning) and ends at 17:00. Power system setup as on 1000621019 (5.2 T, 1 MA inner wall limited). Set OH1, OH2U and OH2L fizzle delays at 300 ms. Set TF fizzle delay at 400 ms. Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid disabled 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 ---------------------------------------------------------------------------- Run plan for Wedensday, 1000823: MP 268 -- ICRF Commissioning MP276 SOL Trans/Burping (Piggyback) Session leader: S. Wukitch Physics operator: R. Parker For first plasma shot, load from 1000621019 (1.0 MA, 5.2 T). 1. Power testing and conditioning for D, E and J-port antennas 2. Power ramps for D, E and J 3. Power steps 4. gap, density, I, and BT scans While the primary purpose of the run is RF commissioning, Sanjay and Brian will piggyback with the burping probe as described in MP276. ---------------------------------------------------------------------------- 001 fizzle 002 fizzle 003 dud 004 dud 005 fizzle 006 plasma D-port - 750 kW, one fault E-port - 750 kW, clean J3 - 400 kW, couple faults J4 - max faults > 100 kW next shot: overlap D and E-port and retune 007 plasma injection during J-port D-port - failed did not work overlapped E-port - 750 kW, clean J3 - 400 kW, couple faults J4 - 400 kW, couple faults next shot: raise D and E-port to 1 MW each J-port to 1.5 MW 008 fizzle 009 plasma, early disruption D and E ran until disruption at ~0.84 sec next shot: try again 010 fizzle 011 plasma D-port failed after E-port came on E-port clean 1 MW max faults on J3&4 after brief ramp next shot: repeat 012 fizzle 013 early disruption ~0.54 sec 014 fizzle 015 early disruption, ~0.53 sec 016 early disruption ~1.1 sec D-port 1 MW, but max faults after E-port 1 MW,clean J3&J4 ramped but then J3 failed next shot: repeat 017 plasma early disruption D-port 1.3 MW E-port failed J-port ramped before disruption Summary: We had a few shots where we managed to get plasma and RF. D and E-port struggled to run simultaneously, but this might be a result of the poor damping. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:11:753PM |
| Author: To Be Determined |
| Run Plan and Engineering Setup for 1000823 MP268 ICRF Commissioning MP276 SOL Trans/Burping (Piggyback) Session Leader: S. Wukitch Physics Operator: R. Parker Engineering Operators: B. Cochran/G. Dekow Engineering Setup: Overnight ECDC in D2, stopping 1-2 hours before run. Run begins at *** 10:00 *** NOTE!!! (It could be later, depending on success of RF conditioning) and ends at 17:00. Power system setup: Same as for 1000621019 (5.2 T, 1 MA inner wall limited) Set OH1, OH2U and OH2L fizzle delays at 300ms Set TF fizzle delay at 400 ms Gas setup: B-Top 6 psi D2 Hybrid Enabled B-side lower 1 psi Argon Hybrid DISABLED B-side upper leave as is Hybrid DISABLED C-side 30 psi D2 Hybrid Enabled J-bottom leave as is Hybrid DISABLED The following Gate Valves should be ENABLED, assuming no vacuum problems: ECE, VUV Run Plan: For the first shot, we'll load from 1000621019, an inner-wall-limited, 1.0 MA, 5 T shot. This shot will be modified as necessary to accomplish the following: 1. Power testing and conditioning for D, E and J-port antennas 2. Power ramps for D, E and J 3. Power steps 4. Gap, density, I and BT scans While the primary purpose of the run is RF commissioning, Sanjay and Brian will piggyback with the burping probe as described in MP276. Run Summary: The run began at noon, because the RF Group needed extra time for conditioning. The first shot was an EFC power supply test, which was necessary to check repairs made to the supply after the last run. The test was successful and the run proceeded. The first 4 shots were without normal plasmas: 2 fizzles, and 2 duds. The problem seemed to be associated with initial fill pressure, which was clearly too low for the duds, shots 3 and 4. Finally after raising the fill to 0.08 mT, a normal discharge was obtained. B. Labombard reported that the pulse gas gauge was reading too low, based on comparison with barotron gauges. This could have explained the relatively high apparent pressure needed to get the discharge to start properly. However, the pulse gas width was in proportion to the pressure according to the ratio established from previous runs. So whether there is a problem here remains uncertain. What is true is thata somewhat higher gauge reading than normal was necessary to get the plasma to start up. Shots 6 and 7 ran normally, but then difficulties began as Argon was injected starting with shot 8 which disrupted. Then began a pattern of disruptive shots, with normal startup, alternating with fizzles. This pattern continued through shot 15 which ran, but disrupted. At this point it was noticed that the Ar pulse was wider than normal (~ 50 ms vs. 25) and that the piggyback experiment was injecting C in the form of C2D4. Either puff might have been leading to the disruption problems. Therefore, both injections were stopped beginning with shot 16. In fact, the discharges continued to disrupt after the puffs were terminated, this time possibly due to RF, but the disruptions occured at later times and there were no further fizzles in the remaining 2 shots. Overall, not a great day for the machine: 8 shots (6 of which disrupted), 6 fizzles and 2 duds. |
| Session Leader Comments | |||
| Aug 23 2000 12:08:49:530PM | 1000823001 | Steve Wukitch | 001 chopper test next shot: plasma - inner wall limited, BT~5.2T, Ip~1 MA |
| Aug 23 2000 12:13:22:170PM | 1000823002 | Steve Wukitch | 002 fizzle |
| Aug 23 2000 12:59:19:857PM | 1000823003 | Steve Wukitch | 003 dud |
| Aug 23 2000 01:13:53:310PM | 1000823004 | Steve Wukitch | 004 dud |
| Aug 23 2000 01:14:42:857PM | 1000823005 | Steve Wukitch | 005 fizzle |
| Aug 23 2000 01:22:23:983PM | 1000823006 | Steve Wukitch | 006 plasma D-port - 750 kW, one fault E-port - 750 kW, clean J3 - 400 kW, couple faults J4 - max faults > 100 kW next shot: overlap D and E-port and retune |
| Aug 23 2000 01:44:59:577PM | 1000823007 | Steve Wukitch | 007 plasma injection during J-port next shot: raise D and E-port to 1 MW each J-port to 1.5 MW |
| Aug 23 2000 03:13:19:890PM | 1000823009 | Steve Wukitch | 009 plasma, early disruption D and E ran until disruption at ~0.84 sec next shot: try again |
| Aug 23 2000 03:13:42:640PM | 1000823010 | Steve Wukitch | 010 fizzle next shot: try again |
| Aug 23 2000 03:25:21:763PM | 1000823011 | Steve Wukitch | 011 plasma D-port failed after E-port came on E-port clean 1 MW max faults on J3&4 after brief ramp next shot: repeat |
| Aug 23 2000 03:35:50:340PM | 1000823012 | Steve Wukitch | 012 fizzle |
| Aug 23 2000 03:46:19:140PM | 1000823013 | Steve Wukitch | 013 early disruption ~0.54 sec |
| Aug 23 2000 04:04:50:937PM | 1000823014 | Steve Wukitch | 014 fizzle |
| Aug 23 2000 04:39:10:467PM | 1000823015 | Steve Wukitch | 015 early disruption ~0.54 sec |
| Aug 23 2000 04:45:18:950PM | 1000823016 | Steve Wukitch | 016 early disruption ~1.1 sec next shot: repeat |
| Physics Operator Comments | |||
| Aug 23 2000 11:47:16:513AM | 1000823001 | Ron Parker | First shot will be an EFC power supply test. |
| Aug 23 2000 12:04:55:653PM | 1000823001 | Ron Parker | Power supply test was successful. Next shot is setup for plasma--shot 1000621019 is loaded. |
| Aug 23 2000 12:44:43:983PM | 1000823002 | Ron Parker | Shot fizzled! Plasma got tired of waiting. |
| Aug 23 2000 12:45:11:107PM | 1000823002 | Ron Parker | The shot fizzled, probably because BZO was too negative, ~ -4 mT. For this shot, IEF4 was decreased by 20 A, corresponding to ~ -2 mT in BZO. Also, fill pressure was reduced by about 10% to ~ .06 mTorr |
| Aug 23 2000 12:45:43:920PM | 1000823003 | Ron Parker | Shot 3 did not break down. For next shot, EF4 current will be increased by 15 A to -1285 and 0.5 mT will be added to BRO. |
| Aug 23 2000 12:53:50:093PM | 1000823004 | Ron Parker | This shot also did not break down. R. Granetz points out that the sparker appeared not to be operating properly. Pressure will be raised by ~ 10% to .07 mT for next shot. |
| Aug 23 2000 01:08:29:450PM | 1000823005 | Ron Parker | Shot broke down, but fizzled. Pressure will be increased to ~ .08 mT. Also, BRO will be reduced by .25 mT for next shot. |
| Aug 23 2000 01:31:49:233PM | 1000823006 | Ron Parker | Finally a normal shot! Shot ran as programmed. Brian Labombard reports that the pulsed gas pressure gauge is reading incorrectly. This could explain why p=0.08 mT was required to get a normal shot and why there was no breakdown at "normal" pressures of ~ 0.06 mT. Next shot will be a repeat of shot 6. |
| Aug 23 2000 01:58:01:717PM | 1000823007 | Ron Parker | Shot ran well, as programmed. No change for next shot except Ar will be injected at ~ 350 ms. Any further problems with breakdown, fizzles, power supplies ,etc., should be blamed on Ar injection. |
| Aug 23 2000 02:36:35:560PM | 1000823008 | Ron Parker | Shot 8 was a fizzle, possibly the walls are becoming loaded and the pressure is now too high. For shot 9, the fill pressure will be reduced to ~ 0.07 mT. |
| Aug 23 2000 02:44:19:950PM | 1000823009 | Ron Parker | Shot 9 did not fizzle, but did disrupt due to unidentified injection around 0.81 s. Shot 10 will be a repeat, hopefully without the injection. |
| Aug 23 2000 03:09:21:890PM | 1000823010 | Ron Parker | This shot fizzled, not unusual after a disruption. Initial fields and pressure are the same as for previous shot. |
| Aug 23 2000 03:18:40:577PM | 1000823011 | Ron Parker | Shot ran, but again disrupted, this time at about 1.45 s. No changes for next shot, which will probably fizzle after this disruption. |
| Aug 23 2000 03:46:04:390PM | 1000823012 | Ron Parker | Shot 12 was a fizzle, expected after the disruption in shot 11. No change for next shot. |
| Aug 23 2000 03:47:47:403PM | 1000823013 | Ron Parker | Shot 13 started up, but disrupted at 0.6 s. Next shot will probably fizzle. |
| Aug 23 2000 04:39:07:530PM | 1000823014 | Ron Parker | Shot 14 did fizzle as expected. After a disruption, there seems to be an impurity problem during the current rise that prevents the current from rising rapidly enough. The subsequent fizzle seems to clean the walls well enough to permit the current rise to rise at the required rate on the next shot. This has been the pattern for most of the day. |
| Aug 23 2000 04:37:18:577PM | 1000823015 | Ron Parker | Shot 15 disrupted, therefore the next shot will likely fizzle. Speculation is that either the Ar puff or the C2D4 puff could be causing the disruption problems. This will be checked by turning both puffs off for the remainder of the run, which unfortunately will have only 2-3 more shots.. |
| Aug 23 2000 04:47:06:030PM | 1000823016 | Ron Parker | Shot 16 ran (surprisingly, since the previous shot disrupted), but did disrupt at about 1.1 s. |
| Aug 23 2000 05:01:53:170PM | 1000823017 | Ron Parker | The last shot ran, but again disrupted at ~ 1.1 s. This disruption might be associated with the J port antenna. Interestingly, there were no more fizzles after the Ar and C2D4 puffs were suppressed. Nevertheless, the plasmas continued to disrupt. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 11:49:57:873AM | Test | Ok | EFC Chopper Test Only |
| 2 | 12:07:07:903PM | Plasma | Ok | |
| 3 | 12:24:27:437PM | Plasma | Ok | |
| 4 | 12:42:00:810PM | Plasma | Ok | |
| 5 | 12:57:45:077PM | Plasma | Ok | |
| 6 | 01:13:19:903PM | Plasma | Ok | |
| 7 | 01:38:10:060PM | Plasma | Ok | |
| 8 | 01:59:58:297PM | Plasma | Ok | |
| 9 | 02:32:27:750PM | Plasma | Ok | |
| 10 | 02:50:18:293PM | Plasma | Ok | |
| 11 | 03:09:37:780PM | Plasma | Ok | |
| 12 | 03:24:31:607PM | Plasma | Ok | |
| 13 | 03:42:50:030PM | Plasma | Ok | |
| 14 | 04:03:20:280PM | Plasma | Ok | |
| 15 | 04:21:26:810PM | Plasma | Ok | |
| 16 | 04:38:02:733PM | Plasma | Ok | |
| 17 | 04:51:23:420PM | Plasma | Ok | |