| Miniproposals | ||||||||||||
|
| Operators | |
| Session leader(s): | Joseph Snipes,Steve Wukitch |
| Physics operator(s): | Ron Parker |
| Engineering operator(s): | Unknown |
| Engineering Operator Run Comment |
| Continued Startup, ICRF Conditioning, TAE Mode Studies/Wukitch?Snipes/Pa |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:32:007PM |
| Author: To Be Determined |
| Run Summary for Active MHD Diagnostic Checkout 1030501 It was a difficult day to get results due to a number of machine problems discussed in the Physop summary. In addition, because I was sharing the day with Wukitch and our needs were somewhat incompatible, I could not get large variations in the TAE mode frequency. The density was not well controlled because of outgassing of the inner wall. The TF could not be varied significantly because that would move the resonance and disturb the ICRF. The ICRF also generated substantial noise on the pickup coil signals making it very difficult to find a resonance, particularly since the peak in the present matching circuit is right at 500 kHz, which is the beat frequency of the D and E antennas, though J-port broadband noise also disturbs the signals. I also could not vary the Active MHD driving frequency more than about 50 kHz without a significant loss of current in the antenna. Then, I assumed the TAE frequency was for deuterium, but because there was substantial hydrogen, the actual TAE frequency was significantly higher. So, the driving frequency was probably well away from resonance on all discharges except perhaps one, shot 6, where there was an injection that raised the density abruptly and a peak in the FFT was observed. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:17:647PM |
| Author: To Be Determined |
| PHYSOP_SUMMARY_1030501 Run Plan for Thursday, May 1, 2003 PURPOSE: Continued Startup, ICRF Condiitoning, TAE Mode Studies Session Leaders: Wukitch, Snipes Physop: Parker ENGINEERING SETUP ECDC in D2 Overnight prior to run; 60 C Bake Run Starts at 9:00 AM and Ends at 5:00 PM Power Systems as on 1030429024 Gas setup: Fill B-Top with 6 psi of D2 hybrid enabled (PG4) Fill B-side lower with 1 psi Ar Hybrid enabled (PG1) Fill B-side upper with 10 psi D2 Hybrid Disabled (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) ICRF: Transmitters 1, 2, 3 and 4 in Run On by 7:00 AM. Enable the ECE and DNB gate-valves, assuming no vacuum problems RUN PLAN Continued conditioning of the ICRF. Investigation of TAE modes in Limited Discharges We'll start with a fudicial discharge, e.g, 1030430018, then move to a limited configuration. The field will be 5.4 T and the current 800 kA. The nominal density will be about 0.8e^20, but there will be some variations of n around that value. RUN SUMMARY Run started with 3 shots ending in early disruption. The cause was traced to a problem with the EF2 power supply, apparently due to faulty cables or connections. At any rate, there were serious differences between shunt and rogowski monitors of the current. After disconnecting and reconeecting the cables, the problem went away. Discharges then lasted until disruptions occuring at the time of J-port RF power turn on, which caused a problem with the EF1 supply. This problem turned out to be due to open flanges in the RF transmission system. After correcting, the shots began to run well (after shot 9).Finding and fixing the problem caused a 1 hour delay. Beginning with shot 10, the shots ran fairly reliably although with frequent disruptions during rampdown. Runaways were generally a problem until shot 20 when the fill pressure was raised by 2 ms. However, this causes intermittent fizzles as in shot 22. A few klitches a long the way: camac/data system problems on shot 15-16 and an early crowbar on shot 23. These shots were inner wall limited from shot 8 on at the request of J. Snipes. Some featured small (< 10%) modulation of the B field. Scorecard: 27 shots, 23 started up properly, but of those 9 disrupted mostly due to the power supply problems mentioned above, a few due to high RF power. 2 shots were power tests, 1 was a power supply failure and 1 was a fizzle. |
| Session Leader Comments |
| Physics Operator Comments | |||
| May 1 2003 09:04:15:733AM | 1030501001 | Ron Parker | First shot will reproduce shot 1030430018. If OK, we'll proceed to move to limited discharges. |
| May 1 2003 09:16:55:000AM | 1030501001 | Ron Parker | Shot disrupted at 140 ms. Run again |
| May 1 2003 09:32:46:450AM | 1030501002 | Ron Parker | Shot again disrupted early. We will load shot 1030429006 |
| May 1 2003 09:43:22:933AM | 1030501003 | Ron Parker | Again, an early disruption. No change for next shot. |
| May 1 2003 10:07:49:750AM | 1030501004 | Ron Parker | Shot 4 made it until 93 ms, then disrupted. At this point EF1 upper and lower rogowski's report differing signals at that time and the disruption seems to begin with z-movement. Suspect a pickup problem of RF from J port. Earlier shots have differences in EF2 between shunt and rogowski that could have caused the early disruption. |
| May 1 2003 10:16:19:613AM | 1030501005 | Ron Parker | Test shot |
| May 1 2003 10:26:48:080AM | 1030501005 | Ron Parker | Next shot will have J-port firing into a dummy load. Testing interference with EF1 |
| May 1 2003 10:55:37:593AM | 1030501006 | Ron Parker | Shot ran more or less normally. J-port fired into dummay load. |
| May 1 2003 10:57:06:223AM | 1030501007 | Ron Parker | Shot 7 ran well, J-port again fired into a dummy load. Next shot will be limited. |
| May 1 2003 11:21:13:697AM | 1030501008 | Ron Parker | Shot disrupted at 77 msec. Marginally limited at this time. Move CLEARIN 1 cm more inside. Leave RCUR since the right gap was 2 cm whereas we want ~ 1cm. |
| May 1 2003 12:31:36:580PM | 1030501009 | Ron Parker | Shot 9 ran limited for the duration of the shot. However, it disrupted during rampdown where it transitioned to upper single null. We'll move zxu up to avoid becoming diverted. RF Group found open flanges during prolonged (1 hour) power room access. Correcting this may solve the problem of RF pickup in EF supply. |
| May 1 2003 12:47:59:387PM | 1030501010 | Ron Parker | Success. Shot 10 ran until inversion (but disrupted during rampdown) with no interference from RF. |
| May 1 2003 01:00:13:513PM | 1030501011 | Ron Parker | Shot 11 ran as programmed, except lack of densiy control above 0.6e20. Still disrupting during rampdown at ~ 300 kA. |
| May 1 2003 01:18:30:713PM | 1030501012 | Ron Parker | Shot 12 ran as programmed. Still no density control at the 6-8e^20 level. Also disrupted during rampdown at 500 kA. Next shot: 10 % variation in B |
| May 1 2003 01:26:50:350PM | 1030501013 | Ron Parker | Shot ran but disrupted at 1.12 sec, near minimum in TF ramp. Try again. |
| May 1 2003 01:34:33:630PM | 1030501014 | Ron Parker | Shot 14 ran, but again disrupted. Is it RF or the sweep or both or neither? next shot will be a repeat with no RF. |
| May 1 2003 01:51:56:733PM | 1030501015 | Ron Parker | Shot 15 was a no-power shot. Data system issues. One of the highways is down. |
| May 1 2003 02:25:17:410PM | 1030501016 | Ron Parker | 15 minute delay due to Camac problem. Shot ran, disrupted during shut down. New problems with data system, no magnetics. |
| May 1 2003 02:48:40:027PM | 1030501017 | Ron Parker | Shot 17 ran well, no RF, no disruption except ~170 ka at rampdown. Next, J-port will be on until 0.9s, field ramp 10 % down from ~ 1s to end. |
| May 1 2003 03:09:00:243PM | 1030501018 | Ron Parker | Shot 18 ran well. Hards are problem early. No changes for next shot. |
| May 1 2003 03:11:13:607PM | 1030501019 | Ron Parker | Shot 19 ran OK, but disrupted during rampdown. Add 2 ms of pulse gas for next shot. |
| May 1 2003 03:20:09:887PM | 1030501020 | Ron Parker | Shot 20 ran well. J-port power up to 1.5 MW. Field still modulated after 1 sec. |
| May 1 2003 03:32:43:593PM | 1030501021 | Ron Parker | Shot 21 ran well. Runaways under control by raising initial fill. Density stabilizes at ~ 8.5e^19 without gas. RF is firing all transmitters but power is intermittent. |
| May 1 2003 03:45:08:363PM | 1030501022 | Ron Parker | This was a fizzle. Probably due to raising the fill to cure hards. Try again before reducing fill. |
| May 1 2003 03:59:07:837PM | 1030501023 | Ron Parker | Shot 23 didn't go; crowbarred at switch closure. |
| May 1 2003 04:32:56:700PM | 1030501024 | Ron Parker | Shot 24 went without any adjustments. Next shot: Anticipate a fizzle. |
| May 1 2003 04:37:41:287PM | 1030501025 | Ron Parker | No fizzle, but a disruption, probably RF induced. |
| May 1 2003 04:50:28:087PM | 1030501026 | Ron Parker | Shot 26 ran well, D&E produced > 2 MW. J still intermettent. Next shot: no changes. This will be the last shot today. |
| May 1 2003 05:13:42:513PM | 1030501027 | Ron Parker | Shot 27 ran OK, but disrupted likely due to high RF power. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:03:58:653AM | Plasma | Ok | |
| 2 | 09:16:58:487AM | Plasma | Ok | |
| 3 | 09:31:54:197AM | Plasma | Ok | |
| 4 | 09:44:53:093AM | Plasma | Bad | EF1 Type 1 Flt |
| 5 | 10:15:17:237AM | Test | Ok | EF2 Rog. Test |
| 6 | 10:30:38:450AM | Plasma | Ok | |
| 7 | 10:47:42:667AM | Plasma | Ok | |
| 8 | 11:06:16:890AM | Plasma | Bad | EF1 type 1 flt |
| 9 | 11:24:49:330AM | Plasma | Ok | No ef1 faults |
| 10 | 12:31:26:173PM | Plasma | Ok | |
| 11 | 12:49:13:873PM | Plasma | Ok | |
| 12 | 01:03:59:100PM | Plasma | Ok | |
| 13 | 01:17:09:480PM | Plasma | Ok | |
| 14 | 01:29:54:780PM | Plasma | Ok | |
| 15 | 01:42:31:160PM | Plasma | Bad | camac problem no power shot |
| 16 | 02:18:26:540PM | Plasma | Ok | |
| 17 | 02:33:04:407PM | Plasma | Ok | |
| 18 | 02:47:24:210PM | Plasma | Ok | |
| 19 | 03:00:25:967PM | Plasma | Ok | |
| 20 | 03:13:16:783PM | Plasma | Ok | |
| 21 | 03:26:12:630PM | Plasma | Ok | |
| 22 | 03:38:56:150PM | Plasma | Ok | |
| 23 | 03:51:42:310PM | Plasma | Bad | OH2U&L fault early in shot |
| 24 | 04:11:07:840PM | Plasma | Ok | |
| 25 | 04:31:28:137PM | Plasma | Ok | |
| 26 | 04:44:19:873PM | Plasma | Ok | |
| 27 | 04:57:21:347PM | Plasma | Ok | |