| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | John Rice |
| Physics operator(s): | Ron Parker |
| Engineering operator(s): | Unknown |
| Engineering Operator Run Comment |
| Purpose: MP#390 Large Volume ITB's at 2.8 T with 50 MHz |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:05:850PM |
| Author: John Rice |
| Session Leader Run Summary for 1040506 MP370 Large Volume ITBs at 2.8 T w/ 50 MHz ICRF The J-port ICRF got off to a slow start because of the high neutral pressures following boronization. Suitable ITB target plasmas at 3.4 T and 500 kA were quickly established. After several conditioning shots, H-modes were obtained on shots 19 and 23 with on-axis heating at 3.5 T. H-modes were also obtained with off-axis heating at 2.9 T on shots 24-27. Shots 28 and 34 had ITBs. From core Thomson scattering, there was no apparent foot, with the density peaking extending all the way to the edge pedestal, as anticipated. Density profiles from Dalsa had a foot-like bump feature near the half radius, but further analysis is needed. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:50:223PM |
| Author: Ron Parker |
| ;; This buffer is for notes you don't want to save, and for Lisp evaluation. ;; If you want to create a file, visit that file with C-x C-f, ;; then enter the text in that file's own buffer. Physop Summary 1040506 The run started a little late with three shots that were cycle tests made necessary by a computer hangup.But once underway, the machine performed well, especially considering that this was a post boronization recovery run. Only the first shot fizzled, after that every plasma started up well, although one or two disrupted early on. The first plasma shot was shot 5 and that was a fidicial shot to check wall conditions, impurity levels, gas pressure etc. Then, the field was lowered to 3.4-3.5 T for a number of shots. However, the neutral pressure was too high for J-port (at 50 MHz) to run, so a number of cleaning shots were run at 5.4 T to reduce this pressure.The field was lowered back to 3.4 T on shot 17 and to 2.8 T on shot 24 and ITB studies then began.The shots looked promising as the hour became late and unfortunately the run had to end before long ITB's could be produced. Scorecard: 3 test cycles, 1 fizzle, no duds, 7 disruptions, the rest useable shots, although the J-port ( 50MHz ) RF was not able to run at low field until midway in the run due to excessive neutral pressure. Engineering Setup and Run Plan 1040506 Boronization overnight, after which discharge cleaning following usual post-boronization procedure Run begins at 09:00 and ends at 17:00 Purpose: MP#390 Large Volume ITB's at 2.8 T with 50 MHz Session leader: Rice Physop: Parker Engineering Setup: Power Supplies as on 1040505, A-coil configuration as in 1031121019, power supplies enabled Gas System Setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) leave B-side upper with 15 psi He3 Hybrid DISABLED (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) Diagnostic gate valve permissives for ECE, VUV, DNB assuming no vacuum problems RF: All Transmitters in RUN-ON by 08:30 Run Plan Since this is a post boronization run, we'll start with a fidicial discharge, e.g., 1040505015 Assuming success, we'll move on to the run plan which calls for running BT ~ 3.4 T and Ip ~ 500 kA.with the ICRF will be at 50 MHz (on axis). We'll then lower the field to 2.8 T, moving the 50 MHz off axis and, assuming ITB formation, apply 80 MHz 2nd harmonic heating on axis. We expect the ITB, if it forms, to move its foot location outwards, near r/a =0.8 based on extrapolation of previous data.Operating at low plasma current and field should also test the ITB behavior at higher beta. |
| Session Leader Comments | |||
| May 6 2004 09:48:08:047AM | 1040506004 | John Rice | fiz |
| May 6 2004 10:15:41:570AM | 1040506005 | John Rice | vanilla shot |
| May 6 2004 10:16:53:160AM | 1040506006 | John Rice | 500 kA, 3.6 T good target plasma |
| May 6 2004 10:28:52:343AM | 1040506007 | John Rice | 500 kA, 3.6 T good target plasma |
| May 6 2004 10:46:58:023AM | 1040506008 | John Rice | 500 kA, 3.6 T good target plasma 600 kW RF, no H-mode |
| May 6 2004 10:57:15:020AM | 1040506009 | John Rice | 470 kA, 3.4 T good target no J power yet |
| May 6 2004 11:16:30:153AM | 1040506010 | John Rice | 470 kA, 3.4 T good target no J power |
| May 6 2004 11:32:52:977AM | 1040506011 | John Rice | 800 kA, 5.4 T to lower neutral pressure |
| May 6 2004 11:57:16:930AM | 1040506012 | John Rice | 800 kA, 5.4 T lower density to lower neutral pressure |
| May 6 2004 12:10:02:143PM | 1040506013 | John Rice | 800 kA, 5.4 T lower density to lower neutral pressure |
| May 6 2004 12:22:39:420PM | 1040506014 | John Rice | 800 kA, 5.4 T lower density to lower neutral pressure H-mode |
| May 6 2004 12:36:54:697PM | 1040506015 | John Rice | 800 kA, 5.4 T lower density to lower neutral pressure H-mode |
| May 6 2004 01:03:27:983PM | 1040506016 | John Rice | 800 kA, 5.4 T lower density to lower neutral pressure H-mode |
| May 6 2004 01:06:26:123PM | 1040506017 | John Rice | 480 kA, 3.4 T no J power |
| May 6 2004 01:22:00:727PM | 1040506018 | John Rice | 500 kA, 3.5 T 1 MW J power |
| May 6 2004 01:33:31:737PM | 1040506019 | John Rice | 470 kA, 3.4 T 1.2 MW J power |
| May 6 2004 01:45:17:827PM | 1040506020 | John Rice | 470 kA, 3.4 T 1.2 MW J power |
| May 6 2004 02:04:33:883PM | 1040506021 | John Rice | 470 kA, 3.4 T 0.8 MW J power |
| May 6 2004 02:12:16:723PM | 1040506022 | John Rice | 470 kA, 3.4 T 1.4 MW J power no H-mode |
| May 6 2004 02:26:53:030PM | 1040506023 | John Rice | 470 kA, 3.4 T, lower density 1.4 MW J power H-mode |
| May 6 2004 02:40:01:930PM | 1040506024 | John Rice | 470 kA, 2.9 T 1.4 MW J power, trips H-modes |
| May 6 2004 02:52:55:003PM | 1040506025 | John Rice | 470 kA, 2.9 T 1.4 MW J power H-mode |
| May 6 2004 03:05:12:970PM | 1040506026 | John Rice | 470 kA, 2.9 T 1.3 MW J power H-modes |
| May 6 2004 03:16:46:150PM | 1040506027 | John Rice | 470 kA, 2.9 T 1.3 MW J power H-modes |
| May 6 2004 03:39:01:753PM | 1040506028 | John Rice | 470 kA, 2.9 T 1.3 MW J power H-mode density peaking ITB |
| May 6 2004 03:45:55:797PM | 1040506029 | John Rice | 470 kA, 2.9 T 0 MW J power |
| May 6 2004 04:00:15:930PM | 1040506030 | John Rice | 470 kA, 2.9 T 1.1 MW J power H-mode trips |
| May 6 2004 04:10:28:397PM | 1040506031 | John Rice | disrupted |
| May 6 2004 04:29:16:187PM | 1040506032 | John Rice | multiple H-modes |
| May 6 2004 04:49:09:380PM | 1040506033 | John Rice | multiple H-modes |
| May 6 2004 05:01:36:500PM | 1040506034 | John Rice | 2.8 T 1.1 MW J 1.2 MW E multiple H-modes |
| Physics Operator Comments | |||
| May 6 2004 09:47:42:797AM | 1040506002 | Ron Parker | First shot will be setup as in 1040505015 except Ip = 800 kA. Slight (we hope) delay while Josh attends to computer hangup. First shot will be no power cycle test. |
| May 6 2004 09:48:50:797AM | 1040506003 | Ron Parker | Shot 3 was also a cycle test and was successful. Next will be plasma attempt |
| May 6 2004 02:58:58:487PM | 1040506003 | Ron Parker | Shot 23 seemed to run well, no disruption. RF at ~ 1.4 MW. Next shot, we'll try for 2.8 T |
| May 6 2004 09:50:58:593AM | 1040506004 | Ron Parker | First plasma shot fizzled. Breakdown looked reasonble, probably too dirty to break through impurity barrier. |
| May 6 2004 10:00:19:433AM | 1040506005 | Ron Parker | After carefully retuning (actually nothing was changed), shot ran well. Now we'll set up for 3.4 Tesla, 94.4 kA TF and 500 kA Ip. |
| May 6 2004 11:30:36:320AM | 1040506006 | Ron Parker | Shot 6 went off as programmed with 500 kA at 3.6 T. Next: Repeat |
| May 6 2004 10:34:23:750AM | 1040506007 | Ron Parker | Sjot 7 went off OK. Same discharge, field was 3.6, not 3.4 T so we'll lower TF curremt for next shot to come closer to 3.4 T on-axis. Otherwise, no changes to machine settings. |
| May 6 2004 11:15:05:593AM | 1040506008 | Ron Parker | Shot 8 was the same as previous shot except field was 3.4 T. No changes. |
| May 6 2004 11:15:45:250AM | 1040506009 | Ron Parker | Shot 9 was the same as previous shot. We are continuing with same shots. |
| May 6 2004 11:17:42:373AM | 1040506010 | Ron Parker | Shot 10 went off as programmed. No RF. |
| May 6 2004 11:25:27:430AM | 1040506010 | Ron Parker | Neutral pressure on these shots seems to be too high for J-port. We'll return to shot 5, 800 kA, 5.4 T to try to burn off neutral gas. |
| May 6 2004 11:47:22:597AM | 1040506011 | Ron Parker | Shot 11 looked good, neutral pressure at G-side was ~ 0.5 mT. We'll sit here with this shot for a while to see if the neutral pressure can be reduced. On the next shot, the density n_eL(4) will be reduced to 0.7. |
| May 6 2004 12:10:30:863PM | 1040506012 | Ron Parker | Shot 12 ran nicely, with somewhat lower density, the pressure at G-side came down a bit to ~ 0.35 mT. |
| May 6 2004 12:14:40:033PM | 1040506013 | Ron Parker | Shot 13 also ran well, but pressure at G-side came back to 0.5 mT. But density was also up, to 1.0e20 m-2 on n_e.L(4). E-port Rf at ~ 1MW, nothing from other antennas. |
| May 6 2004 12:27:02:700PM | 1040506014 | Ron Parker | Shots continue to behave. Shot H-mode with 1 MW. Next shot, lower density again to 0.5 e20 m-2. |
| May 6 2004 12:37:32:807PM | 1040506015 | Ron Parker | Although the density did not drop much if at all, the G-side pressure continues to decrease, now at 0.2 mT. |
| May 6 2004 12:57:50:313PM | 1040506016 | Ron Parker | OK, shot contiues to run well and neutral pressure at G side is staying around 0.2 mT. Now we will revert to shot 10, with lower density, targeting 0.5 e 20 m-2 Bill Rowan now operating |
| May 6 2004 02:18:19:550PM | 1040506017 | Ron Parker | Shot 17 ran well, but RF was spotty. |
| May 6 2004 01:23:45:007PM | 1040506018 | Ron Parker | Disruption at 0.8 s. This looks like an injection. Just try again. |
| May 6 2004 01:41:26:907PM | 1040506019 | Ron Parker | Disruption at 1.15 s. Disruption occurred during RF. Evidence of injection on SXR and carbon monitor. Increase nl_04 to 0.8e+20 |
| May 6 2004 01:49:30:717PM | 1040506020 | Ron Parker | Disruption at 0.8 s. nl_04 = 0.8e+19 as requested. Still looks like an injection on the SXR signal. Will try lower RF power for a shot to look for correlation. |
| May 6 2004 02:03:38:133PM | 1040506021 | Ron Parker | Disruption at 0.93 s Soft x-ray signal takes off again before the disruption. RXL = 0.0 |
| May 6 2004 02:15:40:207PM | 1040506022 | Ron Parker | Disruption at 0.845 s Reduced nl_04 to 0.5e+20 at the request of the SL Parker back as PO |
| May 6 2004 03:00:22:690PM | 1040506023 | Ron Parker | Shot 23 ran well, without disrupting. Next shot: the TF will be set at 2.8 T |
| May 6 2004 02:58:31:813PM | 1040506024 | Ron Parker | Shot 24 ran well at 2.8 T. But RF straddled the point at which the field leveled off at 2.8 T. For the next shot, the machine settings will be the same but the RF will be intitiated at the breakpoint in the TF waveform. |
| May 6 2004 03:01:12:890PM | 1040506025 | Ron Parker | Shot 25 disrupted at 1.14 s. We'll repeat next shot. |
| May 6 2004 03:31:23:707PM | 1040506026 | Ron Parker | Shot 26 ran well. no changes for next shot. |
| May 6 2004 03:32:35:003PM | 1040506027 | Ron Parker | Shot 27 ran well, RF is getting better. |
| May 6 2004 03:34:19:940PM | 1040506028 | Ron Parker | Shot 28 was great! RF stayed on and ITB seemed to develop. Now we'll try to extend it. |
| May 6 2004 03:52:26:560PM | 1040506029 | Ron Parker | Ooops, no RF on that shot. We'll repeat. |
| May 6 2004 04:10:27:240PM | 1040506030 | Ron Parker | Shot 30 ran OK. |
| May 6 2004 04:26:51:483PM | 1040506031 | Ron Parker | Shot 31 disrupted early, beginning at 100 ms. No change for next shot. |
| May 6 2004 04:36:02:183PM | 1040506032 | Ron Parker | Shot 32 made it until the programmed end ofthe shot, then disrupted. An ITB appeared but was somewhat intermittent. TF field will be reduced to 2.8 from 2.87 on next shot. |
| May 6 2004 05:00:52:423PM | 1040506033 | Ron Parker | Shot 33 ran well, ITB starts to form but RF trips out and the ITB drops out. Steve notivced that a number of control waveforms were not properly extended in view of the loner pulse length. These have been remedied for the last shot. |
| May 6 2004 05:05:30:687PM | 1040506034 | Ron Parker | Shot 34 ran well and made it half way through ramp down at 2 s until disrupting. Clear ITB forms. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:25:00:510AM | Test | Ok | Shot Cycle Test |
| 3 | 09:23:53:407AM | Test | Ok | |
| 4 | 09:34:51:957AM | Plasma | Ok | |
| 5 | 09:48:05:377AM | Plasma | Ok | |
| 6 | 10:12:42:163AM | Plasma | Ok | |
| 7 | 10:25:41:097AM | Plasma | Ok | |
| 8 | 10:41:11:310AM | Plasma | Ok | |
| 9 | 10:53:57:820AM | Plasma | Ok | |
| 10 | 11:13:43:860AM | Plasma | Ok | |
| 11 | 11:29:44:947AM | Plasma | Ok | |
| 12 | 11:48:05:140AM | Plasma | Ok | |
| 13 | 12:07:22:647PM | Plasma | Ok | |
| 14 | 12:20:21:173PM | Plasma | Ok | |
| 15 | 12:33:17:963PM | Plasma | Ok | |
| 16 | 12:45:42:397PM | Plasma | Ok | |
| 17 | 01:02:56:360PM | Plasma | Ok | |
| 18 | 01:15:47:683PM | Plasma | Ok | |
| 19 | 01:28:25:270PM | Plasma | Ok | |
| 20 | 01:42:22:813PM | Plasma | Ok | |
| 21 | 01:55:46:103PM | Plasma | Ok | |
| 22 | 02:08:19:990PM | Plasma | Ok | |
| 23 | 02:23:25:263PM | Plasma | Ok | |
| 24 | 02:36:08:900PM | Plasma | Ok | |
| 25 | 02:48:44:177PM | Plasma | Ok | |
| 26 | 03:01:14:547PM | Plasma | Ok | |
| 27 | 03:13:45:090PM | Plasma | Ok | |
| 28 | 03:28:11:833PM | Plasma | Ok | |
| 29 | 03:42:47:313PM | Plasma | Ok | |
| 30 | 03:55:20:793PM | Plasma | Ok | |
| 31 | 04:08:06:630PM | Plasma | Ok | |
| 32 | 04:23:37:830PM | Plasma | Ok | |
| 33 | 04:44:56:163PM | Plasma | Ok | |
| 34 | 04:58:37:237PM | Plasma | Ok | |