| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Unknown |
| Physics operator(s): | Ron Parker |
| Engineering operator(s): | Bill Cochran |
| Engineering Operator Run Comment |
| Plasma Startup And Conditioning |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:19:600PM |
| Author: Ron Parker |
Purpose: Plasma startup and conditioning Physics operator: Parker Engineering operator: Cochran ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Bake at 60 C overnight as well. Run begins at 9:00 and ends at 17:00. Power systems the same as on 1031023015 including control coil settings. 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 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) Ninja should be setup with Neon gas fill @ 400 Torr Enable the following gate valves: ECE, VUV, DNB ----------------------------------------------------------------------- RF Setup: Transmitters 1,2,3, and 4 in RUN ON by 8:00 am ----------------------------------------------------------------------- Run Plan: Continue running cleanup plasmas while monitoring H/D, etc. RF Group will continue antenna conditioning. ----------------------------------------------------------------------- The run started slowly, first because of finishing repairs to the chopper power supply, which had failed during the previous run, and second due to misfiring in the control of an EF bank.charging circuit. The first 6 shots were devoted to troubleshooting and correcting these problems.Thus the first plasma shot was shot 7, and this occurred at about 11:30, somewhat later than had been anticipated. Shot 7 ran well and essentially reproduced shot 1031023015, from which it was loaded. The RF ran sporadically, as it did all day, and the plasma responded with sporadic H-modes. Shot 8 was a dud, shot 9 ran well, similar to shot 7, but shot 10 was again a dud. The machine seemed to be in an "every-other-shot" mode. After fine tuning the EF4 current, the machine started up reliably but disrupted regularly at ~ 0.6 sec for the next 5 shots. Finally it was discovered that the Ninja valve was injecting Neon, as called for in the run plan, instead of Helium as the operator had thought. Turning off the Ninja valve cured the disruption scenario. After this was discovered, the Neon fill was reduced to 2 psi from 8, and disruptions were not a problem for the remainder of the run. Shots 17-20 went off well at 800 kA, and these were used to investigate Neon emission from CXRS with the NBI. No definitive signal of Neon X was observed. For shot 21, and earlier 900 kA shot was loaded, but the shot was a dud.Shot 22 did run at 900 kA, but shot 23 was again a dud. At this point shot 19 was reloaded since startup seemed reliable for this shot's settings. Shots 24, 25 and 26 all ran well at 800 kA (RF still sporadic), but 27 was a dud.28 went off well, but 29 was a dud. Finally, shot 30 went off as programmed. Scorecard:6 shots, no plasma due to engineering problems; 6 duds; 5 disruptions due to Neon injection; and 13 full shots useful for RF conditioning. |
| Session Leader Comments |
| Physics Operator Comments | |||
| Oct 24 2003 10:14:55:513AM | 1031024001 | Ron Parker | Shot 1 was a chopper power supply test. The chopper fault that occurred yesterday has been repaired. |
| Oct 24 2003 10:16:10:463AM | 1031024002 | Ron Parker | Shot 2 was also a also a chopper power supply test, at higher current. |
| Oct 24 2003 10:21:03:680AM | 1031024003 | Ron Parker | Shot 3 was set up to be a plasma shot, but there was a problem with the charging supply for EF1U coil. The shot was aborted prior to commutation. |
| Oct 24 2003 10:48:18:533AM | 1031024004 | Ron Parker | Shot 4 was a test of the Ef charging circuit. Next shot will be another test. |
| Oct 24 2003 10:54:36:920AM | 1031024005 | Ron Parker | The charging power supply did not go again. There will be another test shot |
| Oct 24 2003 11:23:05:883AM | 1031024006 | Ron Parker | Shot 6 again tested the charging circuit. The problem is in the control circuit, not the power circuit itself. The problem has at least temporarily been fixed by Joe and Yuri. We'll go ahead with plasma on the next shot. |
| Oct 24 2003 11:36:53:073AM | 1031024007 | Ron Parker | Finally, a plasma shot. Patience is a virtue. Shot ran pretty much as shot 15 from yesterday, which was loaded. RF was sporadic as were the H-modes |
| Oct 24 2003 11:47:50:880AM | 1031024008 | Ron Parker | Shot 8 was a dud. Power room and cell entries, then try again. |
| Oct 24 2003 12:04:49:507PM | 1031024009 | Ron Parker | After delicately fine-tuning absolutely nothing, the shot went. Plasma is similar to shot 7. A few H-Modes, peak n_e.L(4) ~ 1.5. |
| Oct 24 2003 12:22:53:790PM | 1031024010 | Ron Parker | Shot 10 was a dud. Very strange since shot 9 started up well. We seem to be in an every-other-shot mode. No changes, try again. |
| Oct 24 2003 01:05:21:507PM | 1031024011 | Ron Parker | Shot 11 started up well, but disrupted at 0.65 sec. We've added 10 A to EF |
| Oct 24 2003 12:48:25:067PM | 1031024012 | Ron Parker | Shot 13 started OK, but again disrupted at 0.65 sec. I will lower the current slightly for next shot. |
| Oct 24 2003 01:07:56:473PM | 1031024013 | Ron Parker | Shot 13 again disrupted --3 in a row at same time. Next shot: no Argon |
| Oct 24 2003 01:19:10:357PM | 1031024014 | Ron Parker | Again, a disruption at 0.64 sec. Next shot: Move X-point down 1 cm and to the inside 1 cm.. |
| Oct 24 2003 01:45:57:477PM | 1031024015 | Ron Parker | Shot 15 disrupted again, thus the divertor strike point is not the issue. Ooooops! Ninja was activated as if it had been backfilled with He. However, the run plan called for it to be backfilled with Ne. Massive amounts of Neon disrupt tokamaks. Daah. Next shot: No Ninja |
| Oct 24 2003 01:48:29:473PM | 1031024016 | Ron Parker | Mystery solved. No Ninja, no disruption. Apologies to all who had been falsely accused of causing the disruption. On the next shot, Neon will be injected at 2 psi, down from 8. Argon back on. |
| Oct 24 2003 02:44:48:960PM | 1031024017 | Ron Parker | Shot 17 went as programmed, no disruption with Ninja, but also no Ne signal from beam. |
| Oct 24 2003 02:45:55:333PM | 1031024018 | Ron Parker | Shot 18 went off as programmed. Ninja operated, but no Ne signal. |
| Oct 24 2003 02:46:46:867PM | 1031024019 | Ron Parker | Shot 19 went off as programmed, still no sign of Neon from beam spectroscopy. |
| Oct 24 2003 02:48:34:147PM | 1031024020 | Ron Parker | Shot 20 went off as programmed. Next shot: Reload shot 1031024009 |
| Oct 24 2003 03:00:15:137PM | 1031024021 | Ron Parker | Shot 21 was a dud. Shot 009 had an EF4 current of -1310, whereas subsequent shots had 1320. EF4 will be increased to -1320. |
| Oct 24 2003 03:21:49:183PM | 1031024022 | Ron Parker | Shot 22 ran well, current increased to 900 kA. After tis shot, vacuum gate valve will close at end of shot and stay closed for 8 minutes, for wall retention studies. |
| Oct 24 2003 03:36:19:000PM | 1031024023 | Ron Parker | Shot 23 was a dud. Reload shot 19. Result of keeping main vacuum valve closed? |
| Oct 24 2003 03:40:50:247PM | 1031024024 | Ron Parker | Shot 24 came back, similar to earlier 800 kA shots, e.g, shot 19. |
| Oct 24 2003 03:59:55:640PM | 1031024025 | Ron Parker | Shot 25 went of OK. No changes comng up. |
| Oct 24 2003 04:19:48:560PM | 1031024026 | Ron Parker | Shot 26 ran well. No Changes. |
| Oct 24 2003 04:23:23:323PM | 1031024027 | Ron Parker | Shot 27 was a dud. Next shot: no changes. |
| Oct 24 2003 04:57:56:757PM | 1031024028 | Ron Parker | Shot 28 went off as programmed. RF still conditioning. |
| Oct 24 2003 04:57:20:100PM | 1031024029 | Ron Parker | So far, no clear sign of Neon X line from CXRS. Shot 29 was a dud. Next shot will likely go. Gate valve still closing after shots. |
| Oct 24 2003 05:04:15:977PM | 1031024030 | Ron Parker | Shot 30 ran well, as expected. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:42:16:130AM | Test | Ok | |
| 2 | 09:53:47:497AM | Test | Ok | |
| 3 | 10:08:43:893AM | Plasma | Bad | EF1U Comm.SW Charging supply error |
| 4 | 10:36:10:730AM | Test | Bad | EF1U cap. bank charge test |
| 5 | 10:47:54:830AM | Test | Bad | EF1U carge test |
| 6 | 11:15:10:420AM | Test | Ok | |
| 7 | 11:26:45:160AM | Plasma | Ok | |
| 8 | 11:41:58:273AM | Plasma | Ok | |
| 9 | 11:56:02:480AM | Plasma | Ok | |
| 10 | 12:11:42:220PM | Plasma | Ok | |
| 11 | 12:25:16:333PM | Plasma | Ok | |
| 12 | 12:39:09:980PM | Plasma | Ok | |
| 13 | 12:53:17:720PM | Plasma | Ok | |
| 14 | 01:08:18:940PM | Plasma | Ok | |
| 15 | 01:21:41:603PM | Plasma | Ok | |
| 16 | 01:35:36:687PM | Plasma | Ok | |
| 17 | 01:52:35:487PM | Plasma | Ok | |
| 18 | 02:06:21:583PM | Plasma | Ok | |
| 19 | 02:24:04:260PM | Plasma | Ok | |
| 20 | 02:40:11:670PM | Plasma | Ok | |
| 21 | 02:54:23:017PM | Plasma | Ok | |
| 22 | 03:07:44:350PM | Plasma | Ok | |
| 23 | 03:23:15:057PM | Plasma | Ok | |
| 24 | 03:36:32:797PM | Plasma | Ok | |
| 25 | 03:50:23:707PM | Plasma | Ok | |
| 26 | 04:05:11:227PM | Plasma | Ok | |
| 27 | 04:18:54:967PM | Plasma | Ok | |
| 28 | 04:32:11:643PM | Plasma | Ok | |
| 29 | 04:46:34:507PM | Plasma | Ok | |
| 30 | 05:00:46:147PM | Plasma | Ok | |