| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Jim Irby |
| Physics operator(s): | Ron Parker |
| Engineering operator(s): | Bill Byford,Bill Cochran |
| Engineering Operator Run Comment |
| Recovery from vacuum vent to Helium, determining and reducing H/D ratio, |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:26:977PM |
| Author: To Be Determined |
| Session Leader Summary for run 1010711 SS: Irby PO: Parker EO: Cochran, Byford Though the run was painful from a hardware sense, some useful things were learned today. After the bake and glow over the last few days, we recovered H/D ratios today that have usually taken us several days of plasma discharges and ECDC to achieve. Shot 9 for example, started out at 10% and rose to 30% during the discharge, with about 1 MW of RF power from the D and E antennas. With a few more discharges today, we would have been ready for boronization. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:13:613PM |
| Author: To Be Determined |
ENGINEERING SETUP FOR 1010711: GLOW Discharge Clean in He overnight, stopping in time for ECDC in D2 from 6:00 - 8:00 AM RUN BEGINS AT 9:00 AND ENDS AT 5:00 Power systems the same as for shot 1010614008 Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 6 psi He Hybrid DISABLED (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) fill J-Bottom with 6 psi He Hybrid DISABLED(PG5) Enable the following gate valves: ECE, DNB, VUV RF STATUS: XMTR 1 AND 2, RUN-ON STARTED AT 8:00 AM XMTR 3 AND 4, RUN-ON STARTED AT 9:00 AM RUN PLAN: Recovery from vacuum vent to Helium, determining and reducing H/D ratio, and determining RF matching coefficients for 70 MHz operation of J-Port antenna. We'll start with an 800 kA shot @ 5.3 T and n~1.e20, and take it from there. RUN SUMMARY: This was a frustrating run, with hardware problems limitng the number of successful shots to just 3. The first problem to develop was a crowbar of the TF after the inversion. The overvoltage protect system on the TF bus was suspected, but this did not turn out to be the problem. Neither was the time of inversion the cause, as the crowbar still occured even after changing the invert time. So the crowbar problem remains to be resolved. The second problem was associated with the hybrid.This occurred on shot 6, which was a dud. The programming voltages to the power supplies had step-like waveforms and caused the coil currents to be far from their proper values at the time of commutation. After a shot to test the hybrid, during which it seemed to perform properly, a plasma shot was reloaded and it ran well. Unfortunately, with all the delays, this was the last shot. The summary is: 1 dud, 1 fizzle and 3 plasma shots with the remaining 4 shots used for tests. |
| Session Leader Comments |
| Physics Operator Comments | |||
| Jul 11 2001 08:52:12:637AM | 1010711001 | Ron Parker | First shot will be programmed for Ip = 800 kA, Bt = 5.3 T and n = 1e20 m-3. Startup conditions will be those for shot 1010614008. |
| Jul 11 2001 09:36:13:590AM | 1010711001 | Ron Parker | The first shot was a fizzle, with late breakdown. Initial fill pressure was high, 8.5e-5 Torr and BR was 0.0 mT. For the next shot, the pressure will be lowered by 15% and BR offset will be decreased to -.5 mT. ECDC will also be initiated between shots. |
| Jul 11 2001 10:06:59:880AM | 1010711002 | Ron Parker | Shot 2 started up OK, although breakdown was a bit late. We'll adjust the fill to be closer to .07 mT (reducing pulse width by 10 %) and increase the BZ offset, aiming for -1 mT, rather than -2 mT. The plasma disrupted at about 0.97 s. also, the TF crowbarred after inversion. No devices were lost. The next two shots will be power tests. |
| Jul 11 2001 10:28:13:100AM | 1010711003 | Ron Parker | Shot 3 tested alternator excitation. Shot 4 will test the TF at 50 kA. |
| Jul 11 2001 10:35:56:950AM | 1010711004 | Ron Parker | Power systems checked out OK. Next shot should be a plasma shot. |
| Jul 11 2001 11:09:19:250AM | 1010711005 | Ron Parker | Shot 5 ran OK, but TF again crowbarred. The TF bus overvoltage protect ckt will be checked, followed by shot 6, a 100 kA TF test. |
| Jul 11 2001 03:07:51:890PM | 1010711006 | Ron Parker | Shot 6 was a TF power test at 100 kA. Next shot will be an attempt at a plasma shot. |
| Jul 11 2001 04:56:57:893PM | 1010711007 | Ron Parker | Shot 7 was a dud. The problem was traced to the hybrid. Power supply voltages exhibited step-like waveforms prior to t=0, and the currents were not appropriate for startup. Next shot will be a test of hybrid. |
| Jul 11 2001 04:58:20:350PM | 1010711008 | Ron Parker | Shot 8 was a test of hybrid, which appeared normal. Shot 9, the last shot, will be a plasma attempt |
| Jul 11 2001 05:01:48:700PM | 1010711009 | Ron Parker | The last shot, somewhat surprisingly, ran normally. However, the TF again crowbarred. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:59:48:580AM | Plasma | Ok | Fizzle |
| 2 | 09:31:01:837AM | Plasma | Bad | TF Type One Fault |
| 3 | 10:14:20:260AM | Test | Ok | Alternator Ramp Test Only |
| 4 | 10:27:12:583AM | Test | Ok | TF 50 Kamp test only |
| 5 | 10:40:22:563AM | Plasma | Bad | TF Type One Fault |
| 6 | 02:42:26:103PM | Test | Ok | TF 100Kamp Test only |
| 7 | 03:05:54:110PM | Plasma | Ok | All Power Supplies Fired, but Hybid might have a problem |
| 8 | 04:39:31:237PM | Test | Ok | Hybrid Test Shot |
| 9 | 04:51:02:477PM | Plasma | Bad | TF Type 1 fault |