| Miniproposals | ||||||||||||
|
| Operators | |
| Session leader(s): | T. Sunn Pederson,Robert Granetz |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Bill Byford,Bill Parkin |
| Engineering Operator Run Comment |
| SL:Granetz/Pederson PO:Granetz EO:Byford/Parkin MP #236 H-Mode pedestal |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:25:383PM |
| Author: To Be Determined |
| Physics operator summary for run 1001107: MP #236 H-mode pedestal asymmetry with reversed field Session leader: R. Granetz/T. Sunn Pedersen Physics operator: R. Granetz Summary: This was not a great day as far as plasma operation goes. Of the plasmas that we were able to get, all of them disrupted when the auxiliary power reached 2 MW. No H-modes were observed. The run was plagued by fizzles early on, but startup reliability improved after a while. Unfortunately, computer problems caused major delays in the afternoon. Late in the run we determined that the disruptions were caused by E-port when operated at about 1 MW. One positive note is that ECDC in D2 between shots kept the H/D ratio down to 3-4%. This run will be continued tomorrow. Scorecard: 8 plasmas 8 fizzles 1 dud (power supply failure) 0 tests 4 aborted and/or screwed up by computers ---------- 21 total ------------------------------------------------------------------------------- Engineering setup and run plan for Tuesday 07 Nov 2000. MP #236 H-mode pedestal asymmetry with reversed field Session leader: Granetz/Pedersen Physics operator: Granetz ECDC in D2 overnight, ending 2 hours before the run. Run starts at 09:00 and ends at 17:00. Power systems as on 1001106024. Gas setup fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED fill B-side upper with 35 psi of D2 Hybrid DISABLED, for ECDC fill C-side with 30 psi of D2 Hybrid enabled leave J-bot as is Hybrid DISABLED We would like the following gate valves should be enabled: ECE, VUV, Beast ------------------------------------------------------------------------------- Run Plan: Start with 0.8 MA, lower null plasma. We probably need at least 2.5 MW of ICRF for >200 ms. Ideally we'd like 3+ MW for 0.5 s, but we'll take what we can get. Assuming we do indeed get H-modes with reversed field, we would then try it at 1.0 MA, and then at 1.2 MA. Argon puffing will also be required for JR to get up/down argon profiles. I'll load segment 1 from 1001106020 (late shot on Monday), and segment 2 from 1001103022 (last plasma on Friday), except I'll set the density to nl_04=1.0e20 m-2. I've saved this to scratch_disk:[granetz]pcs_1001107000. ------------------------------------------------------------------------------- Overnight ECDC in D2. Hybrid coldstart done; no errors found Loaded shot scratch_disk:[granetz]1001107000 (see preceding note). ------------------------------------------------------------------------------- ECDC in D2 will be done between shots today. Shot 01 -- Fizzle. Fields need tweaking. Next shot: add -15 A to IC_EF4 and -0.5 mT to Br0 offset. ECDC in D2 is being done between shots. Shot 02 -- Plasma. Disrupted at t=0.75 s, just as the RF gets up to 2 MW. It's obviously due to a large impurity injection. Plasma startup looks good. Next shot: no PCS changes. (between-shot ECDC is being done) Shot 03 -- Fizzle. Not surprising after the disruption. Fields look good. Next shot: no PCS changes. (between-shot ECDC is being done) Shot 04 -- Fizzle. Next shot: reduce pre-fill puff by 2 ms (to 20 ms) Shot 05 -- Fizzle. Gas pressure is still a touch high. Next shot: reduce pre-fill puff by another 2 ms (to 18 ms) No ECDC after this shot. Shot 06 -- Fizzle. Late breakdown...almost went. Gas pressure was a little too low. Next shot: raise pre-fill back up to 20 ms. No ECDC after this shot. Shot 07 -- Fizzle. Almost made it. Looks like it hit on the outside. Next shot: raise pre-fill 1 more ms (to 21 ms) No ECDC after this shot. Shot 08 -- Dud. No EF2's. Next shot: no PCS changes. Shot 09 -- Plasma. 0.8 MA. Disrupted at 0.87 s. Can't see anything obvious on the videos at the time of the disruption. Prf peaks at 2.0 MW. H/D=3-4%. Next shot: no PCS changes. Argon will be enabled. Shot 10 -- Plasma. Disrupted at t=0.85 s. Prf peaks at 2.0 MW. H/D=4-5%. Zeff=1.25. No injection observable from antennas, but the disruptions are definitely due to large injections. Strike points look fine. Next shot: reduce TF from 5.37 to 5.20 T to aid H-mode threshold. ECDC is turned on after this shot. Shot 11 -- Plasma. Disrupted at t=0.77 s. Prf peaks at 2 MW. Btor=5.24 T. H/D=4%. Still looks like an injection is killing the plasma. Next shot: no PCS changes, but turn off the RF for the next shot. Shot 12 -- Plasma. Good shot. Makes it all the way through rampdown. So it looks like the disruptions are indeed due to the RF power. Elongation is increasing late in the shot because of the ZXL programming. H/D=3%. Next shot: change ZXL programming to avoid increasing elongation, turn on J-port transmitter only, with 1 MW of power. Continue with ECDC between shots. Shot 13 -- Fizzle. Fields and gas look identical to the previous shot. Next shot: no changes. Shot 14 -- Fizzle. Bz might be a touch too negative. Next shot: raise IC_EF4 by +10 A. Shot 15 -- Aborted due to computer problems. Long delay due to computer problems. Shot 16 -- Plasma. Good shot. J-port gave 1.2 MW. D and E were off. H/D=3-3.5%, even during the RF pulse. Zeff=1.2. No H-modes. Next shot: test D, E, and J antennas individually. ECDC is on between shots. Shot 17 -- Aborted due to computer problems. Shot 18 -- Aborted due to computer problems. Shot 19 -- Aborted due to computer problems. (Actually, at least one PF supply fired, but we don't know which one(s), because there was no data acquisition.) Shot 20 -- Plasma. Disrupted at t=0.62 s, while the E-antenna (only) was on. I'd say that's pretty conclusive. Next shot: run D and J together, and keep E off. Shot 21 -- Plasma. Good shot. J had many faults. D worked very well at 1.07 MW. E also worked well at 0.5 MW by itself (after D and J turned off). No H-modes. Total power did not stay above 1.07 MW for more than a few milliseconds at a time. End of run. (To be continued tomorrow) |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:12:630PM |
| Author: To Be Determined |
| Physics operator summary for run 1001107: MP #236 H-mode pedestal asymmetry with reversed field Session leader: R. Granetz/T. Sunn Pedersen Physics operator: R. Granetz Summary: This was not a great day as far as plasma operation goes. Of the plasmas that we were able to get, all of them disrupted when the auxiliary power reached 2 MW. No H-modes were observed. The run was plagued with unreliable startups, but computer problems also caused major delays in the afternoon. Late in the run we determined that the disruptions were caused by E-port when operated at about 1 MW. One positive note is that ECDC in D2 between shots kept the H/D ratio down to 3-4%. This run will be continued tomorrow. Scorecard: 8 plasmas 8 fizzles 1 dud (power supply failure) 0 tests 4 aborted and/or screwed up by computers ---------- 21 total ------------------------------------------------------------------------------- Engineering setup and run plan for Tuesday 07 Nov 2000. MP #236 H-mode pedestal asymmetry with reversed field Session leader: Granetz/Pedersen Physics operator: Granetz ECDC in D2 overnight, ending 2 hours before the run. Run starts at 09:00 and ends at 17:00. Power systems as on 1001106024. Gas setup fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED fill B-side upper with 35 psi of D2 Hybrid DISABLED, for ECDC fill C-side with 30 psi of D2 Hybrid enabled leave J-bot as is Hybrid DISABLED We would like the following gate valves should be enabled: ECE, VUV, Beast ------------------------------------------------------------------------------- Run Plan: Start with 0.8 MA, lower null plasma. We probably need at least 2.5 MW of ICRF for >200 ms. Ideally we'd like 3+ MW for 0.5 s, but we'll take what we can get. Assuming we do indeed get H-modes with reversed field, we would then try it at 1.0 MA, and then at 1.2 MA. Argon puffing will also be required for JR to get up/down argon profiles. I'll load segment 1 from 1001106020 (late shot on Monday), and segment 2 from 1001103022 (last plasma on Friday), except I'll set the density to nl_04=1.0e20 m-2. I've saved this to scratch_disk:[granetz]pcs_1001107000. ------------------------------------------------------------------------------- Overnight ECDC in D2. Hybrid coldstart done; no errors found Loaded shot scratch_disk:[granetz]1001107000 (see preceding note). ------------------------------------------------------------------------------- ECDC in D2 will be done between shots today. Shot 01 -- Fizzle. Fields need tweaking. Next shot: add -15 A to IC_EF4 and -0.5 mT to Br0 offset. ECDC in D2 is being done between shots. Shot 02 -- Plasma. Disrupted at t=0.75 s, just as the RF gets up to 2 MW. It's obviously due to a large impurity injection. Plasma startup looks good. Next shot: no PCS changes. (between-shot ECDC is being done) Shot 03 -- Fizzle. Not surprising after the disruption. Fields look good. Next shot: no PCS changes. (between-shot ECDC is being done) Shot 04 -- Fizzle. Next shot: reduce pre-fill puff by 2 ms (to 20 ms) Shot 05 -- Fizzle. Gas pressure is still a touch high. Next shot: reduce pre-fill puff by another 2 ms (to 18 ms) No ECDC after this shot. Shot 06 -- Fizzle. Late breakdown...almost went. Gas pressure was a little too low. Next shot: raise pre-fill back up to 20 ms. No ECDC after this shot. Shot 07 -- Fizzle. Almost made it. Looks like it hit on the outside. Next shot: raise pre-fill 1 more ms (to 21 ms) No ECDC after this shot. Shot 08 -- Dud. No EF2's. Next shot: no PCS changes. Shot 09 -- Plasma. 0.8 MA. Disrupted at 0.87 s. Can't see anything obvious on the videos at the time of the disruption. Prf peaks at 2.0 MW. H/D=3-4%. Next shot: no PCS changes. Argon will be enabled. Shot 10 -- Plasma. Disrupted at t=0.85 s. Prf peaks at 2.0 MW. H/D=4-5%. Zeff=1.25. No injection observable from antennas, but the disruptions are definitely due to large injections. Strike points look fine. Next shot: reduce TF from 5.37 to 5.20 T to aid H-mode threshold. ECDC is turned on after this shot. Shot 11 -- Plasma. Disrupted at t=0.77 s. Prf peaks at 2 MW. Btor=5.24 T. H/D=4%. Still looks like an injection is killing the plasma. Next shot: no PCS changes, but turn off the RF for the next shot. Shot 12 -- Plasma. Good shot. Makes it all the way through rampdown. So it looks like the disruptions are indeed due to the RF power. Elongation is increasing late in the shot because of the ZXL programming. H/D=3%. Next shot: change ZXL programming to avoid increasing elongation, turn on J-port transmitter only, with 1 MW of power. Continue with ECDC between shots. Shot 13 -- Fizzle. Fields and gas look identical to the previous shot. Next shot: no changes. Shot 14 -- Fizzle. Bz might be a touch too negative. Next shot: raise IC_EF4 by +10 A. Shot 15 -- Aborted due to computer problems. Long delay due to computer problems. Shot 16 -- Plasma. Good shot. J-port gave 1.2 MW. D and E were off. H/D=3-3.5%, even during the RF pulse. Zeff=1.2. No H-modes. Next shot: test D, E, and J antennas individually. ECDC is on between shots. Shot 17 -- Aborted due to computer problems. Shot 18 -- Aborted due to computer problems. Shot 19 -- Aborted due to computer problems. (Actually, at least one PF supply fired, but we don't know which one(s), because there was no data acquisition.) Shot 20 -- Plasma. Disrupted at t=0.62 s, while the E-antenna (only) was on. I'd say that's pretty conclusive. Next shot: run D and J together, and keep E off. Shot 21 -- Plasma. Good shot. J had many faults. D worked very well at 1.07 MW. E also worked well at 0.5 MW by itself (after D and J turned off). No H-modes. End of run. (To be continued tomorrow) |
| Session Leader Comments | |||
| Nov 6 2000 06:05:55:217PM | Robert Granetz | Engineering setup and run plan for Tuesday 07 Nov 2000. MP #236 H-mode pedestal asymmetry with reversed field Session leader: Granetz/Pedersen Physics operator: Granetz ECDC in D2 overnight, ending 2 hours before the run. Run starts at 09:00 and ends at 17:00. Power systems as on 1001106024. Gas setup fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED fill B-side upper with 35 psi of D2 Hybrid DISABLED, for ECDC fill C-side with 30 psi of D2 Hybrid enabled leave J-bot as is Hybrid DISABLED Assuming no vacuum problems the following gate valves should be enabled: ECE, VUV, Beast | |
| Nov 6 2000 06:06:10:420PM | Robert Granetz | Run Plan: Start with 0.8 MA, lower null plasma. We probably need at least 2.5 MW of ICRF for >200 ms. Ideally we'd like 3+ MW for 0.5 s, but we'll take what we can get. Assuming we do indeed get H-modes with reversed field, we would then try it at 1.0 MA, and then at 1.2 MA. Argon puffing will also be required for JR to get up/down argon profiles. I'll load segment 1 from 1001106020 (late shot on Monday), and segment 2 from 1001103022 (last plasma on Friday), except I'll set the density to nl_04=1.0e20 m-2. I've saved this to scratch_disk:[granetz]pcs_1001107000. | |
| Nov 7 2000 12:30:59:560PM | 1001107009 | T. Sunn Pederson | Plasma - disrupted as the RF approached 2 MW Good signs of heating but no sign of an H-mode yet - as expected. |
| Nov 7 2000 12:35:56:170PM | 1001107010 | T. Sunn Pederson | Quite similar to shot 9 - disrupted slightly earlier I suspect the disruptions are caused by moly injections from the divertor. There are signs of injections from the divertor on the mpeg files. |
| Nov 7 2000 12:37:39:437PM | 1001107011 | T. Sunn Pederson | Same story - disruption occurred even earlier on this one. |
| Nov 7 2000 12:54:57:500PM | 1001107011 | T. Sunn Pederson | Next shot: no RF (to see if the rf is causing the disruptions) |
| Nov 7 2000 01:00:10:420PM | 1001107012 | T. Sunn Pederson | No disruption, full length plasma. So the RF heating does cause the disruptions. |
| Nov 7 2000 01:00:40:280PM | 1001107012 | T. Sunn Pederson | Next shot, try 1 MW from J-port antenna. |
| Nov 7 2000 04:56:37:687PM | 1001107016 | T. Sunn Pederson | After several tries we managed to get a full shot with 1.2 MW from J antenna which did not cause any disruptions. We suspect that the culprit is the E antenna, especially since we have camera views on D and J, showing no activity to speak of. |
| Nov 7 2000 04:59:02:390PM | 1001107020 | T. Sunn Pederson | After numerous computer glitches and a single power supply glitch we got a plasma in which we were to launch 1 MW of RF from E, then 1 MW from D antenna, and finally 1.5 MW from J antenna to see which one was causing the problem. The shot disrupted shortly after E antenna reached 1 MW, confirming our suspicions that E antenna is the source of the injections. |
| Nov 7 2000 05:16:34:997PM | 1001107021 | T. Sunn Pederson | This shot went the full length - we tried to get 2+ MW out of D and J but only succeeded to get 1 MW out of D whereas J was erratic. As expected with the low heating power, we did not get an H-mode. |
| Physics Operator Comments | |||
| Nov 6 2000 05:43:39:203PM | Robert Granetz | Engineering setup and run plan for Tuesday 07 Nov 2000. MP #236 H-mode pedestal asymmetry with reversed field Session leader: Granetz/Pedersen Physics operator: Granetz ECDC in D2 overnight, ending 2 hours before the run. Run starts at 09:00 and ends at 17:00. Power systems as on 1001106024. Gas setup fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED fill B-side upper with 35 psi of D2 Hybrid DISABLED, for ECDC fill C-side with 30 psi of D2 Hybrid enabled leave J-bot as is Hybrid DISABLED Assuming no vacuum problems the following gate valves should be enabled: ECE, VUV, Beast | |
| Nov 6 2000 05:43:55:717PM | Robert Granetz | Run Plan: Start with 0.8 MA, lower null plasma. We probably need at least 2.5 MW of ICRF for >200 ms. Ideally we'd like 3+ MW for 0.5 s, but we'll take what we can get. Assuming we do indeed get H-modes with reversed field, we would then try it at 1.0 MA, and then at 1.2 MA. Argon puffing will also be required for JR to get up/down argon profiles. I'll load segment 1 from 1001106020 (late shot on Monday), and segment 2 from 1001103022 (last plasma on Friday), except I'll set the density to nl_04=1.0e20 m-2. I've saved this to scratch_disk:[granetz]pcs_1001107000. | |
| Nov 7 2000 08:21:06:747AM | Robert Granetz | Overnight ECDC in D2. Hybrid coldstart done; no errors found Loaded shot scratch_disk:[granetz]1001107000 (see preceding note). | |
| Nov 7 2000 09:36:32:920AM | Robert Granetz | ECDC in D2 will be done between shots today. | |
| Nov 7 2000 09:35:42:187AM | 1001107001 | Robert Granetz | Shot 01 -- Fizzle. Fields need tweaking. Next shot: add -15 A to IC_EF4 and -0.5 mT to Br0 offset. ECDC in D2 is being done between shots. |
| Nov 7 2000 09:35:11:530AM | 1001107002 | Robert Granetz | Shot 02 -- Plasma. Disrupted at t=0.75 s, just as the RF gets up to 2 MW. It's obviously due to a large impurity injection. Plasma startup looks good. Next shot: no PCS changes. (between-shot ECDC is being done) |
| Nov 7 2000 09:51:15:560AM | 1001107003 | Robert Granetz | Shot 03 -- Fizzle. Not surprising after the disruption. Fields look good. Next shot: no PCS changes. (between-shot ECDC is being done) |
| Nov 7 2000 10:18:53:030AM | 1001107004 | Robert Granetz | Shot 04 -- Fizzle. Next shot: reduce pre-fill puff by 2 ms (to 20 ms) |
| Nov 7 2000 10:40:22:670AM | 1001107005 | Robert Granetz | Shot 05 -- Fizzle. Gas pressure is still a touch high. Next shot: reduce pre-fill puff by another 2 ms (to 18 ms) No ECDC after this shot. |
| Nov 7 2000 10:50:27:077AM | 1001107006 | Robert Granetz | Shot 06 -- Fizzle. Late breakdown...almost went. Gas pressure was a little too low. Next shot: raise pre-fill back up to 20 ms. No ECDC after this shot. |
| Nov 7 2000 11:24:16:967AM | 1001107007 | Robert Granetz | Shot 07 -- Fizzle. Almost made it. Looks like it hit on the outside. Next shot: raise pre-fill 1 more ms (to 21 ms) No ECDC after this shot. |
| Nov 7 2000 11:24:06:577AM | 1001107008 | Robert Granetz | Shot 08 -- Dud. No EF2's. Next shot: no PCS changes. |
| Nov 7 2000 12:16:35:280PM | 1001107009 | Robert Granetz | Shot 09 -- Plasma. 0.8 MA. Disrupted at 0.87 s. Can't see anything obvious on the videos at the time of the disruption. Prf peaks at 2.0 MW. H/D=3-4%. Next shot: no PCS changes. Argon will be enabled. |
| Nov 7 2000 12:16:08:687PM | 1001107010 | Robert Granetz | Shot 10 -- Plasma. Disrupted at t=0.85 s. Prf peaks at 2.0 MW. H/D=4-5%. Zeff=1.25. No injection observable from antennas, but the disruptions are definitely due to large injections. Strike points look fine. Next shot: reduce TF from 5.37 to 5.20 T to aid H-mode threshold. ECDC is turned on after this shot. |
| Nov 7 2000 12:34:55:687PM | 1001107011 | Robert Granetz | Shot 11 -- Plasma. Disrupted at t=0.77 s. Prf peaks at 2 MW. Btor=5.24 T. H/D=4%. Still looks like an injection is killing the plasma. Next shot: no PCS changes, but turn off the RF for the next shot. |
| Nov 7 2000 01:01:31:577PM | 1001107012 | Robert Granetz | Shot 12 -- Plasma. Good shot. Makes it all the way through rampdown. So it looks like the disruptions are indeed due to the RF power. Elongation is increasing late in the shot because of the ZXL programming. H/D=3%. Next shot: change ZXL programming to avoid increasing elongation, turn on J-port transmitter only, with 1 MW of power. Continue with ECDC between shots. |
| Nov 7 2000 01:37:22:217PM | 1001107013 | Robert Granetz | Shot 13 -- Fizzle. Fields and gas look identical to the previous shot. Next shot: no changes. |
| Nov 7 2000 01:46:47:467PM | 1001107014 | Robert Granetz | Shot 14 -- Fizzle. Bz might be a touch too negative. Next shot: raise IC_EF4 by +10 A. |
| Nov 7 2000 02:15:20:717PM | 1001107015 | Robert Granetz | Long delay due to computer problems. |
| Nov 7 2000 02:41:14:280PM | 1001107015 | Robert Granetz | Shot 15 -- Aborted due to computer problems. |
| Nov 7 2000 03:06:46:967PM | 1001107016 | Robert Granetz | Shot 16 -- Plasma. Good shot. J-port gave 1.2 MW. D and E were off. H/D=3-3.5%, even during the RF pulse. Zeff=1.2. No H-modes. Next shot: test D, E, and J antennas individually. ECDC is on between shots. |
| Nov 7 2000 04:01:45:403PM | 1001107017 | Robert Granetz | Shot 17 -- Aborted due to computer problems. |
| Nov 7 2000 03:37:33:310PM | 1001107018 | Robert Granetz | Shot 18 -- Aborted due to computer problems. |
| Nov 7 2000 04:44:58:437PM | 1001107019 | Robert Granetz | Shot 19 -- Aborted due to computer problems. (Actually, at least one PF supply fired, but we don't know which one(s), because there was no data acquisition.) |
| Nov 7 2000 04:54:08:043PM | 1001107020 | Robert Granetz | Shot 20 -- Plasma. Disrupted at t=0.62 s, while the E-antenna (only) was on. I'd say that's pretty conclusive. Next shot: run D and J together, and keep E off. |
| Nov 7 2000 05:22:50:153PM | 1001107021 | Robert Granetz | Shot 21 -- Plasma. Good shot. J had many faults. D worked very well at 1.07 MW. E also worked well at 0.5 MW by itself (after D and J turned off). No H-modes. End of run. (To be continued tomorrow) |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:56:54:187AM | Plasma | Ok | |
| 2 | 09:22:25:670AM | Plasma | Ok | |
| 3 | 09:44:13:780AM | Plasma | Ok | |
| 4 | 10:05:53:780AM | Plasma | Ok | |
| 5 | 10:27:23:140AM | Plasma | Ok | |
| 6 | 10:43:27:467AM | Plasma | Ok | |
| 7 | 10:58:23:280AM | Plasma | Ok | |
| 8 | 11:14:46:013AM | Plasma | Ok | |
| 9 | 11:32:30:030AM | Plasma | Ok | |
| 10 | 11:56:56:357AM | Plasma | Ok | |
| 11 | 12:24:27:450PM | Plasma | Ok | |
| 12 | 12:51:07:827PM | Plasma | Ok | |
| 13 | 01:16:59:043PM | Plasma | Ok | |
| 14 | 01:41:34:450PM | Plasma | Ok | |
| 15 | 02:03:54:560PM | Plasma | Bad | no power shot Physop died |
| 16 | 02:43:33:373PM | Plasma | Ok | |
| 18 | 03:33:26:357PM | Plasma | Bad | no power shot , computer failures |
| 19 | 04:33:21:153PM | Plasma | Bad | Only TF power supply turned on |
| 20 | 04:45:52:170PM | Plasma | Ok | |
| 21 | 05:00:45:797PM | Plasma | Ok | |