| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Steve Wukitch |
| Physics operator(s): | Joseph Snipes |
| Engineering operator(s): | Frank Silva |
| Engineering Operator Run Comment |
| MP #214 RF Conditioning/Snipes,Silva |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:08:053PM |
| Author: To Be Determined |
| Engineering setup for 9908011 RF Conditioning Run will begin at 09:00. Setup power supplies from shot 990806009 (1 MA, 5.4 T, flattop to 1.4 s) Two hours of ECDC in D2 prior to run. Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid enabled fill B-side upper with 6 psi of H2 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 A standard Tuesday morning OH test will be done for shot 1. ------------------------------------------------------------------------------- Run Plan for 990811: MP 214 -- RF conditioning Session leader: S. Wukitch Engineer in charge: F. Silva Physics operator: J. Snipes Start by loading 990806009, a 1 MA, 5.4 T discharge. RF may require frequent access to the power room to debug the new power feedback control circuit(s). Summary The machine ran very well today, though I was plagued with fizzles for some unclear reason. The startup was not as robust as it has been the past few runs. Except for the fizzles, all plasmas were full length standard 1 MA plasmas with no disruptions until 1.8 sec at low current. The RF did not run very well though. The run began late (10 am) for testing of the RF feedback circuit. Then, we ran a number of ohmic shots while the RF group did more tests out of plasma. Shots 7, 12, and 13 then had RF between 0.4 and 0.64 MW from J4. There were some tests of the divertor flaps from shot 4 onward opening at 0.9 s for the rest of the discharge. Brian and Sanjay also noticed the fast scanning probe lighting up with carbon emission, though the total amount of carbon coming from the probe was quite small. Scorecard: 7 plasmas 6 fizzles 1 OH test __________ 14 shots Shot 1: Standard Tuesday (on Wednesday) OH test. O.K. Shot 2: Copied shot 990806009. Good shot ramped down below 200 kA past 1.85 sec. Almost a carbon copy of 990806009. Good reproducibility. No RF. Shot 3: Repeat. Good shot. No RF. Shot 4: Repeat with flappers opening at 0.9 sec and then remaining open throughout the rest of the shot. Fizzle! Shot 5: Reduced prepuff by 2 msec to 16 msec duration. Probably we did not wait long enough between shots to pump out the neutrals. Good shot. Shot 6: Repeat again with flappers opening at 0.9 sec. Good shot. Shot 7: Repeat again with flappers opening at 0.9 sec and low RF power from J4 from 0.7 - 0.9 sec. Good shot. Up to 0.4 MW of RF from J4. Shot 8: Repeat with more RF power. Fizzle! Shot 9: Lowered EF4 current from -1275 to -1290 A at breakdown. Fizzle! Shot 10: Returned EF4 current to -1265 A and increased prepuff back to 18 msec duration. Fizzle! Shot 11: Reduced Br0 by 1 mT to 5 mT. Fizzle! Shot 12: Reloaded shot 990811002. Good shot. RF up to 0.4 MW out of J4. Shot 13: Repeat. Good shot. RF up to 0.64 MW on J4. Shot 14: Repeat. Fizzle! |
| Session Leader Comments | |||
| Aug 11 1999 01:19:25:000PM | 990811007 | Steve Wukitch | 007 plasma #4 faulting due to bad tune ramped power from 50-450 kW next shot: raise initial ramp power and repeat |
| Aug 11 1999 01:46:24:730PM | 990811012 | Steve Wukitch | 012 plasma feedback responded properly to fast change in loading at 0.76 sec next shot: raised RF power again with a ramp |
| Aug 11 1999 01:45:49:293PM | 990811013 | Steve Wukitch | 013 plasma 650 kW with low reflected power next shot: need to do a couple of tests on FMIT#3 - it will take about 1/2 hour till next shot raise ramp again and repeat |
| Physics Operator Comments | |||
| Aug 11 1999 08:13:59:670AM | Joseph Snipes | Engineering setup for 9908011 RF Conditioning Run will begin at 09:00. Setup power supplies from shot 990806009 (1 MA, 5.4 T, flattop to 1.4 s) Two hours of ECDC in D2 prior to run. Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid enabled fill B-side upper with 6 psi of H2 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 A standard Tuesday morning OH test will be done for shot 1. ------------------------------------------------------------------------------- Run Plan for 990811: MP 214 -- RF conditioning Session leader: S. Wukitch Engineer in charge: F. Silva Physics operator: J. Snipes Start by loading 990806009, a 1 MA, 5.4 T discharge. RF may require frequent access to the power room to debug the new power feedback control circuit(s). | |
| Aug 11 1999 10:10:58:687AM | 990811001 | Joseph Snipes | Shot 1: Standard Tuesday (on Wednesday) OH test. O.K. |
| Aug 11 1999 10:27:58:280AM | 990811002 | Joseph Snipes | Shot 2: Copied shot 990806009. Good shot ramped down below 200 kA past 1.85 sec. Almost a carbon copy of 990806009. Good reproducibility. No RF. |
| Aug 11 1999 10:34:42:200AM | 990811002 | Joseph Snipes | Brief delay before shot 3 for power room access for the RF group. |
| Aug 11 1999 10:53:20:560AM | 990811003 | Joseph Snipes | Shot 3: Repeat. Good shot. No RF. |
| Aug 11 1999 11:08:39:420AM | 990811004 | Joseph Snipes | Shot 4: Repeat with flappers opening at 0.9 sec and then remaining open throughout the rest of the shot. Fizzle! |
| Aug 11 1999 11:16:37:060AM | 990811005 | Joseph Snipes | Shot 5: Reduced prepuff by 2 msec to 16 msec duration. Probably we did not wait long enough between shots to pump out the neutrals. Good shot. |
| Aug 11 1999 11:34:29:590AM | 990811005 | Joseph Snipes | Brief delay for RF group to sort out a transmitter oscillation. |
| Aug 11 1999 11:49:34:233AM | 990811006 | Joseph Snipes | Shot 6: Repeat again with flappers opening at 0.9 sec. Good shot. |
| Aug 11 1999 12:17:02:403PM | 990811007 | Joseph Snipes | Shot 7: Repeat again with flappers opening at 0.9 sec and low RF power from J4 from 0.7 - 0.9 sec. Good shot. Up to 0.4 MW of RF from J4. |
| Aug 11 1999 12:25:41:060PM | 990811008 | Joseph Snipes | Shot 8: Repeat with more RF power. Fizzle! |
| Aug 11 1999 12:40:05:230PM | 990811009 | Joseph Snipes | Shot 9: Lowered EF4 current from -1275 to -1290 A at breakdown. Fizzle! |
| Aug 11 1999 12:56:58:700PM | 990811010 | Joseph Snipes | Shot 10: Returned EF4 current to -1265 A and increased prepuff back to 18 msec duration. Fizzle! |
| Aug 11 1999 01:11:36:107PM | 990811011 | Joseph Snipes | Shot 11: Reduced Br0 by 1 mT to 5 mT. Fizzle! |
| Aug 11 1999 01:25:16:530PM | 990811012 | Joseph Snipes | Shot 12: Reloaded shot 990811002. Good shot. RF up to 0.4 MW out of J4. |
| Aug 11 1999 01:43:30:280PM | 990811013 | Joseph Snipes | Shot 13: Repeat. Good shot. RF up to 0.64 MW on J4. |
| Aug 11 1999 02:09:45:607PM | 990811014 | Joseph Snipes | Shot 14: Repeat. Fizzle! Perhaps need more negative vertical field. |
| Aug 11 1999 02:20:08:500PM | 990811014 | Joseph Snipes | Summary The machine ran very well today, though I was plagued with fizzles for some unclear reason. The startup was not as robust as it has been the past few runs. Except for the fizzles, all plasmas were full length standard 1 MA plasmas with no disruptions until 1.8 sec at low current. The RF did not run very well though. The run began late (10 am) for testing of the RF feedback circuit. Then, we ran a number of ohmic shots while the RF group did more tests out of plasma. Shots 7, 12, and 13 then had RF between 0.4 and 0.64 MW from J4. There were some tests of the divertor flaps from shot 4 onward opening at 0.9 s for the rest of the discharge. Brian and Sanjay also noticed the fast scanning probe lighting up with carbon emission, though the total amount of carbon coming from the probe was quite small. Scorecard: 7 plasmas 6 fizzles 1 OH test __________ 14 shots |
| Aug 11 1999 02:23:28:980PM | 990811014 | Joseph Snipes | Note that the run was ended early for further RF work offline. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 10:08:15:653AM | Test | Ok | OHs 10Ka Test |
| 2 | 10:19:08:840AM | Plasma | Ok | no faults |
| 3 | 10:44:15:653AM | Plasma | Ok | no faults |
| 4 | 11:02:13:357AM | Plasma | Ok | no faults |
| 5 | 11:15:06:513AM | Plasma | Ok | (null) |
| 6 | 11:47:54:217AM | Plasma | Ok | (null) |
| 7 | 12:04:49:187PM | Plasma | Ok | (null) |
| 8 | 12:24:05:607PM | Plasma | Ok | (null) |
| 9 | 12:38:14:873PM | Plasma | Ok | (null) |
| 10 | 12:51:30:153PM | Plasma | Ok | (null) |
| 11 | 01:05:52:140PM | Plasma | Ok | (null) |
| 12 | 01:19:37:250PM | Plasma | Ok | no faults |
| 13 | 01:38:26:560PM | Plasma | Ok | (null) |
| 14 | 01:58:18:763PM | Plasma | Ok | (null) |
| 15 | 09:06:15:043AM | Test | Bad | |