| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Martin Greenwald |
| Physics operator(s): | Dmitri Mossessian |
| Engineering operator(s): | Unknown |
| Engineering Operator Run Comment |
| MP305 ITB Access conditions, hysteresis; SL: Greenwald; PO: Mossessian; |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:30:007PM |
| Author: To Be Determined |
| Run Plan for 1020828 mp 305 ITB Access Conditions Session Leader - Greenwald Phys Op - Mossessian ============================ Plan: The purpose of the run is to investigate access conditions or trigger for producing off-axis ICRF ITB mode. We will also ook for hysteresis in transition and investigate proximity to marginal stability via heat pulse propagation. Given the difficulties in obtaining an ITB yesterday, we will start with some preliminaries rather than just diving into the mp plan. First we will try to get good heating and a decent EDA at 5.3 T. With all antennas on. Then we will try to change the mix of powers between D,E and J to move power off axis at 5.3 T. If this is not successful we will lower the field - maybe in two steps to try symmetric heating at 5.0 T. Another possibility is to increase the triangularity (upper) to get a better EDA. ============================== Results: We never got to the ITB studies - most of the day was spent studying D and E at 5.3 T. As in previous days, the heating efficiency was not good. Decay of stored energy after an RF trip suggested that no more than 40% of the RF power was being absorbed. This is consistent with overall confinement/stored energy results. Analysis of sawtooth reheat showed a drop in on-axis electron heating by about a factor of 2 compared to the best heating results in discharges with similar field, current, and target density. Radiated power was no higher today than in those previous days (assuming the calibrations can be trusted.) The overnight ECDC seemed to help with the H/D ratio. We started out at 2-4%. This rose during the day, reaching almost 10% by shot 25. We did some between-shot ECDC early in the run, which may have helped a bit. Late in the run, we increased the density by a large factor to help hold this ratio down. The RF was not able to couple well so we didn't give this a real test. Overall, it isn't clear whether the H/D ratio is the culprit or whether we have some other problem. ================================ |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:15:973PM |
| Author: To Be Determined |
| Physop summary for 1020828 MP305 ITB Access conditions, hysteresis SL Greenwald PO Mossessian Start with 1020827028 - 5.3 T, 3MW D&E on-axis heating Summary: Multiple problems with startup, partly caused by running ECDC between shots. On shot 25 density feedback was turned back on since earlyer attempts to change density by changing gas puff were not very succesful. After a series of disruptions (shots 20 and 22) we moved lower x-point out, returning to lower delta of ~.5, which seemed to help. 31 shots 13 fizzles 1 no power shot 17 plasmas Details: ---------------------------------------------------------------------------- 1020828001 mossessian PHYSICS_OPERATOR Aug 28 2002 9:07:20:486AM . . . . . . . . . . . . . . . . . . . . Fizzle. Current rise is too slow . Next shot - PG4 30 -> 25 ms ---------------------------------------------------------------------------- 1020828002 mossessian PHYSICS_OPERATOR Aug 28 2002 9:22:21:373AM . . . . . . . . . . . . . . . . . . . . Fizzle. Current rise is too fast now. Next shot - PG4 25 -> 27 ms ---------------------------------------------------------------------------- 1020828003 mossessian PHYSICS_OPERATOR Aug 28 2002 9:40:53:520AM . . . . . . . . . . . . . . . . . . . . Plasma. Startup is still bad. Next shot - IC_EF4 -1315 -> -1305, BR offset 0.0015 -> 0.002 ---------------------------------------------------------------------------- 1020828004 mossessian PHYSICS_OPERATOR Aug 28 2002 9:50:46:023AM . . . . . . . . . . . . . . . . . . . . Plasma. Startup is better, but current rise is a bit slow. Next shot - no PCS changes ---------------------------------------------------------------------------- 1020828005 mossessian PHYSICS_OPERATOR Aug 28 2002 10:08:26:806AM . . . . . . . . . . . . . . . . . . . . Plasma. Next shot - start ECDC between shots (5 min). Drop gas from 27 to 25 ms. ---------------------------------------------------------------------------- 1020828006 mossessian PHYSICS_OPERATOR Aug 28 2002 10:15:16:163AM . . . . . . . . . . . . . . . . . . . . Fizzle Next shot - Drop gas from 25 to 22 ms. ---------------------------------------------------------------------------- 1020828007 mossessian PHYSICS_OPERATOR Aug 28 2002 10:38:34:566AM . . . . . . . . . . . . . . . . . . . . Plasma. Next shot - Br offset 0.002 -> 0.0025 ---------------------------------------------------------------------------- 1020828008 mossessian PHYSICS_OPERATOR Aug 28 2002 10:48:40:666AM . . . . . . . . . . . . . . . . . . . . NO power shot - power supply fault. ---------------------------------------------------------------------------- 1020828009 mossessian PHYSICS_OPERATOR Aug 28 2002 11:25:46:400AM . . . . . . . . . . . . . . . . . . . . Plasma Next shot - no change ---------------------------------------------------------------------------- 1020828010 mossessian PHYSICS_OPERATOR Aug 28 2002 11:26:27:526AM . . . . . . . . . . . . . . . . . . . . Fizzle Next shot - Bz IC_EF4 -1305 -> -1300, gas 22 ms -> 23 ms ---------------------------------------------------------------------------- 1020828011 mossessian PHYSICS_OPERATOR Aug 28 2002 11:54:07:626AM . . . . . . . . . . . . . . . . . . . . Fizzle Next shot - Bz IC_EF4 -1300 -> -1310, Br offset 0.0025 -> 0.002 ---------------------------------------------------------------------------- 1020828012 mossessian PHYSICS_OPERATOR Aug 28 2002 11:54:36:550AM . . . . . . . . . . . . . . . . . . . . Plasma. Next shot - IC_EF4 -1310 -> -1320, Ip to 1 MA ---------------------------------------------------------------------------- 1020828013 mossessian PHYSICS_OPERATOR Aug 28 2002 12:43:24:643PM . . . . . . . . . . . . . . . . . . . . Plasma. Next shot - gas 22 -> 23 ms to slow down current rise. ---------------------------------------------------------------------------- 1020828014 mossessian PHYSICS_OPERATOR Aug 28 2002 12:43:42:846PM . . . . . . . . . . . . . . . . . . . . Plasma. Next shot - no changes ---------------------------------------------------------------------------- 1020828015 mossessian PHYSICS_OPERATOR Aug 28 2002 12:45:22:506PM . . . . . . . . . . . . . . . . . . . . Fizzle. No ECDC before shot - problems with ECDC power supply Next shot - gas up 24 -> 27 ms ---------------------------------------------------------------------------- 1020828016 mossessian PHYSICS_OPERATOR Aug 28 2002 1:01:50:320PM . . . . . . . . . . . . . . . . . . . . PLasma. Startup is bad - current rises too fast Next shot - gas up 27 -> 30 ms ---------------------------------------------------------------------------- 1020828017 mossessian PHYSICS_OPERATOR Aug 28 2002 1:14:08:483PM . . . . . . . . . . . . . . . . . . . . Fizzle. Current stops rising at 10 ms and plasma is killed by rising Bz Next shot - no changes ---------------------------------------------------------------------------- 1020828018 mossessian PHYSICS_OPERATOR Aug 28 2002 1:22:52:436PM . . . . . . . . . . . . . . . . . . . . Plasma. Starting ECDC between shots again. Next shot - gas down 30 -> 27 ms ---------------------------------------------------------------------------- 1020828019 mossessian PHYSICS_OPERATOR Aug 28 2002 2:05:21:330PM . . . . . . . . . . . . . . . . . . . . Fizzle. Next shot - no changes ---------------------------------------------------------------------------- 1020828020 mossessian PHYSICS_OPERATOR Aug 28 2002 2:06:03:193PM . . . . . . . . . . . . . . . . . . . . Plasma. Disrupted at .78 Next shot - RXL up 2 cm ---------------------------------------------------------------------------- 1020828021 mossessian PHYSICS_OPERATOR Aug 28 2002 2:18:04:760PM . . . . . . . . . . . . . . . . . . . . Fizzle. Next shot - PG3 up to get higher density ---------------------------------------------------------------------------- 1020828022 mossessian PHYSICS_OPERATOR Aug 28 2002 2:30:09:206PM . . . . . . . . . . . . . . . . . . . . Disruption. Bad startup Next shot - RCUR at 1 ms down 0.697 -> 0.68. Br offset 2 -> 1.5 mT ---------------------------------------------------------------------------- 1020828023 mossessian PHYSICS_OPERATOR Aug 28 2002 3:11:30:616PM . . . . . . . . . . . . . . . . . . . . Plasma. Density did not seemto go up much. RXL was moved 2 mm only. Next shot - RXL up 1 cm, PG3 up to get higher ne ---------------------------------------------------------------------------- 1020828024 mossessian PHYSICS_OPERATOR Aug 28 2002 3:24:08:716PM . . . . . . . . . . . . . . . . . . . . Fizzle. Very late breakdown (11 ms). Next shot - Br offest up 0.0015 -> 0.002 ---------------------------------------------------------------------------- 1020828025 mossessian PHYSICS_OPERATOR Aug 28 2002 3:42:50:893PM . . . . . . . . . . . . . . . . . . . . Plasma Next shot - density feedback on. nl target 1.25e20, gas up 27 -> 29 ms ---------------------------------------------------------------------------- 1020828026 mossessian PHYSICS_OPERATOR Aug 28 2002 3:54:43:400PM . . . . . . . . . . . . . . . . . . . . Plasma. Next shot - no change ---------------------------------------------------------------------------- 1020828027 mossessian PHYSICS_OPERATOR Aug 28 2002 4:05:06:060PM . . . . . . . . . . . . . . . . . . . . Fizzle. Next shot - gas down 29 -> 27 ms ---------------------------------------------------------------------------- 1020828028 mossessian PHYSICS_OPERATOR Aug 28 2002 4:32:39:816PM . . . . . . . . . . . . . . . . . . . . Plasma. Next shot - no change ---------------------------------------------------------------------------- 1020828029 mossessian PHYSICS_OPERATOR Aug 28 2002 4:36:01:526PM . . . . . . . . . . . . . . . . . . . . Fizzle. Next shot - add gas 27 -> 29 ms. RCUR @ 1ms to 0.67 ---------------------------------------------------------------------------- 1020828030 mossessian PHYSICS_OPERATOR Aug 28 2002 4:47:52:143PM . . . . . . . . . . . . . . . . . . . . Plasma. Next shot - no change ---------------------------------------------------------------------------- 1020828031 mossessian PHYSICS_OPERATOR Aug 28 2002 4:58:42:226PM . . . . . . . . . . . . . . . . . . . . Fizzle. ---------------------------------------------------------------------------- - |
| Session Leader Comments | |||
| Aug 28 2002 08:58:46:000AM | Martin Greenwald | MP 305 - ITB access conditions The purpose of the run is to investigate access conditions or trigger for producing off-axis ICRF ITB mode. We will also ook for hysteresis in transition and investigate proximity to marginal stability via heat pulse propagation. Plan: Given the difficulties in obtaining an ITB yesterday, we will start with some preliminaries rather than just diving into the mp plan. First we will try to get good heating and a decent EDA at 5.3 T. With all antennas on. Then we will try to change the mix of powers between D,E and J to move power off axis at 5.3 T. If this is not successful we will lower the field - maybe in two steps to try symmetric heating at 5.0 T. Another possibility is to increase the triangularity (upper) to get a better EDA. | |
| Aug 28 2002 09:04:05:730AM | 1020828001 | Martin Greenwald | fizzle |
| Aug 28 2002 09:13:30:793AM | 1020828002 | Martin Greenwald | fizzle |
| Aug 28 2002 09:41:45:553AM | 1020828003 | Martin Greenwald | Plasma Only about 1 MW RF Got steady H-mode, but not much stored energy no TCI H/D ration 2-4% so overnight ECDC probably helped we'll keep an eye on this and ECDC between shots if necessary |
| Aug 28 2002 09:55:27:657AM | 1020828004 | Martin Greenwald | Plasma Steady H-mode RF power up to 2.2 MW but trips on E H/D up a bit |
| Aug 28 2002 10:07:42:540AM | 1020828005 | Martin Greenwald | Similar to last shot Trips on E and J H/D ~ 3.5% We're going to ECDC between shots from now |
| Aug 28 2002 10:16:14:273AM | 1020828006 | Martin Greenwald | fizzle |
| Aug 28 2002 10:31:30:083AM | 1020828007 | Martin Greenwald | Plasma Lots of faults on E, J |
| Aug 28 2002 10:47:45:053AM | 1020828008 | Martin Greenwald | No-power test |
| Aug 28 2002 11:04:53:150AM | 1020828009 | Martin Greenwald | Plasma gap to 1.5 cm no power from D so Prf only about 1MW for most of the shot |
| Aug 28 2002 11:16:04:020AM | 1020828010 | Martin Greenwald | fizzle |
| Aug 28 2002 11:34:55:433AM | 1020828011 | Martin Greenwald | fizzle |
| Aug 28 2002 12:03:54:223PM | 1020828012 | Martin Greenwald | Plasma Long H-mode Many faults on E, J, but several hundred msec steady at 2.6MW |
| Aug 28 2002 12:19:50:520PM | 1020828013 | Martin Greenwald | Plasma RF power steady at 2.5 MW Ip to 1 MA H/D up to 5% Stored energy increase with current but only proportionally to 0.1MJ |
| Aug 28 2002 12:37:24:990PM | 1020828014 | Martin Greenwald | Plasma Steady RF Similar to shot 13 |
| Aug 28 2002 12:39:35:090PM | 1020828015 | Martin Greenwald | fizzle |
| Aug 28 2002 01:05:15:027PM | 1020828016 | Martin Greenwald | Plasma - disrupts at 1.06 sec |
| Aug 28 2002 01:05:28:793PM | 1020828017 | Martin Greenwald | fizzle |
| Aug 28 2002 01:36:14:463PM | 1020828019 | Martin Greenwald | fizzle |
| Aug 28 2002 02:09:48:667PM | 1020828021 | Martin Greenwald | fizzle |
| Aug 28 2002 02:23:26:820PM | 1020828022 | Martin Greenwald | Disrupts early |
| Aug 28 2002 03:11:32:990PM | 1020828023 | Martin Greenwald | Plasma - many faults on RF multiple H-modes no TCI |
| Aug 28 2002 03:14:50:857PM | 1020828024 | Martin Greenwald | fizzle |
| Aug 28 2002 03:45:47:117PM | 1020828025 | Martin Greenwald | Plasma multiple H-modes, multiple RF trips density was supposed to be higher, but wasn't (Idea is to reduce H/D ratio |
| Aug 28 2002 03:47:46:120PM | 1020828026 | Martin Greenwald | Plasma - higher density no H-modes, RF needs to tune to the higher density only got 1 MW |
| Aug 28 2002 04:07:47:020PM | 1020828027 | Martin Greenwald | fizzle |
| Aug 28 2002 04:19:39:807PM | 1020828028 | Martin Greenwald | Plasma Single brief H-mode not much RF power Strange behavior from density programming |
| Aug 28 2002 04:28:57:293PM | 1020828029 | Martin Greenwald | fizzle |
| Aug 28 2002 04:58:29:680PM | 1020828030 | Martin Greenwald | Plasma no H-mode |
| Aug 28 2002 04:58:44:773PM | 1020828031 | Martin Greenwald | fizzle |
| Physics Operator Comments | |||
| Aug 28 2002 08:50:14:387AM | Dmitri Mossessian | MP305 ITB Access conditions, hysteresis SL Greenwald PO Mossessian Start with 1020827028 - 5.3 T, 3MW D&E on-axis heating Load 1020827028. Coldstart OK | |
| Aug 28 2002 09:07:20:487AM | 1020828001 | Dmitri Mossessian | Fizzle. Current rise is too slow . Next shot - PG4 30 -> 25 ms |
| Aug 28 2002 09:22:21:373AM | 1020828002 | Dmitri Mossessian | Fizzle. Current rise is too fast now. Next shot - PG4 25 -> 27 ms |
| Aug 28 2002 09:40:53:520AM | 1020828003 | Dmitri Mossessian | Plasma. Startup is still bad. Next shot - IC_EF4 -1315 -> -1305, BR offset 0.0015 -> 0.002 |
| Aug 28 2002 09:50:46:023AM | 1020828004 | Dmitri Mossessian | Plasma. Startup is better, but current rise is a bit slow. Next shot - no PCS changes |
| Aug 28 2002 10:08:26:807AM | 1020828005 | Dmitri Mossessian | Plasma. Next shot - start ECDC between shots (5 min). Drop gas from 27 to 25 ms. |
| Aug 28 2002 10:15:16:163AM | 1020828006 | Dmitri Mossessian | Fizzle Next shot - Drop gas from 25 to 22 ms. |
| Aug 28 2002 10:38:34:567AM | 1020828007 | Dmitri Mossessian | Plasma. Next shot - Br offset 0.002 -> 0.0025 |
| Aug 28 2002 10:48:40:667AM | 1020828008 | Dmitri Mossessian | NO power shot - power supply fault. |
| Aug 28 2002 11:25:46:400AM | 1020828009 | Dmitri Mossessian | Plasma Next shot - no change |
| Aug 28 2002 11:26:27:527AM | 1020828010 | Dmitri Mossessian | Fizzle Next shot - Bz IC_EF4 -1305 -> -1300, gas 22 ms -> 23 ms |
| Aug 28 2002 11:54:07:627AM | 1020828011 | Dmitri Mossessian | Fizzle Next shot - Bz IC_EF4 -1300 -> -1310, Br offset 0.0025 -> 0.002 |
| Aug 28 2002 11:54:36:550AM | 1020828012 | Dmitri Mossessian | Plasma. Next shot - IC_EF4 -1310 -> -1320, Ip to 1 MA |
| Aug 28 2002 12:43:24:643PM | 1020828013 | Dmitri Mossessian | Plasma. Next shot - gas 22 -> 23 ms to slow down current rise. |
| Aug 28 2002 12:43:42:847PM | 1020828014 | Dmitri Mossessian | Plasma. Next shot - no changes |
| Aug 28 2002 12:45:22:507PM | 1020828015 | Dmitri Mossessian | Fizzle. No ECDC before shot - problems with ECDC power supply Next shot - gas up 24 -> 27 ms |
| Aug 28 2002 01:01:50:320PM | 1020828016 | Dmitri Mossessian | PLasma. Startup is bad - current rises too fast Next shot - gas up 27 -> 30 ms |
| Aug 28 2002 01:14:08:483PM | 1020828017 | Dmitri Mossessian | Fizzle. Current stops rising at 10 ms and plasma is killed by rising Bz Next shot - no changes |
| Aug 28 2002 01:22:52:437PM | 1020828018 | Dmitri Mossessian | Plasma. Starting ECDC between shots again. Next shot - gas down 30 -> 27 ms |
| Aug 28 2002 02:05:21:330PM | 1020828019 | Dmitri Mossessian | Fizzle. Next shot - no changes |
| Aug 28 2002 02:06:03:193PM | 1020828020 | Dmitri Mossessian | Plasma. Disrupted at .78 Next shot - RXL up 2 cm |
| Aug 28 2002 02:18:04:760PM | 1020828021 | Dmitri Mossessian | Fizzle. Next shot - PG3 up to get higher density |
| Aug 28 2002 02:30:09:207PM | 1020828022 | Dmitri Mossessian | Disruption. Bad startup Next shot - RCUR at 1 ms down 0.697 -> 0.68. Br offset 2 -> 1.5 mT |
| Aug 28 2002 03:11:30:617PM | 1020828023 | Dmitri Mossessian | Plasma. Density did not seemto go up much. RXL was moved 2 mm only. Next shot - RXL up 1 cm, PG3 up to get higher ne |
| Aug 28 2002 03:24:08:717PM | 1020828024 | Dmitri Mossessian | Fizzle. Very late breakdown (11 ms). Next shot - Br offest up 0.0015 -> 0.002 |
| Aug 28 2002 03:42:50:893PM | 1020828025 | Dmitri Mossessian | Plasma Next shot - density feedback on. nl target 1.25e20, gas up 27 -> 29 ms |
| Aug 28 2002 03:54:43:400PM | 1020828026 | Dmitri Mossessian | Plasma. Next shot - no change |
| Aug 28 2002 04:05:06:060PM | 1020828027 | Dmitri Mossessian | Fizzle. Next shot - gas down 29 -> 27 ms |
| Aug 28 2002 04:32:39:817PM | 1020828028 | Dmitri Mossessian | Plasma. Next shot - no change |
| Aug 28 2002 04:36:01:527PM | 1020828029 | Dmitri Mossessian | Fizzle. Next shot - add gas 27 -> 29 ms. RCUR @ 1ms to 0.67 |
| Aug 28 2002 04:47:52:143PM | 1020828030 | Dmitri Mossessian | Plasma. Next shot - no change |
| Aug 28 2002 04:58:42:227PM | 1020828031 | Dmitri Mossessian | Fizzle. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:59:19:470AM | Plasma | Ok | |
| 2 | 09:11:55:463AM | Plasma | Ok | |
| 3 | 09:24:45:707AM | Plasma | Ok | |
| 4 | 09:42:53:070AM | Plasma | Ok | |
| 5 | 09:55:40:187AM | Plasma | Ok | |
| 6 | 10:11:54:110AM | Plasma | Ok | |
| 7 | 10:27:03:903AM | Plasma | Ok | |
| 8 | 10:44:40:187AM | Plasma | Bad | EF1L Commutation Bank didn't indicate a charge |
| 9 | 10:57:36:290AM | Plasma | Ok | |
| 10 | 11:14:38:613AM | Plasma | Ok | |
| 11 | 11:33:19:273AM | Plasma | Ok | |
| 12 | 11:48:34:973AM | Plasma | Ok | |
| 13 | 12:04:22:943PM | Plasma | Ok | |
| 14 | 12:21:32:977PM | Plasma | Ok | |
| 15 | 12:37:26:570PM | Plasma | Ok | |
| 16 | 12:50:20:267PM | Plasma | Ok | |
| 17 | 01:03:48:900PM | Plasma | Ok | |
| 18 | 01:17:50:303PM | Plasma | Ok | |
| 19 | 01:34:53:943PM | Plasma | Ok | |
| 20 | 01:51:46:103PM | Plasma | Ok | |
| 21 | 02:08:19:417PM | Plasma | Ok | |
| 22 | 02:21:10:720PM | Plasma | Ok | |
| 23 | 02:55:52:007PM | Plasma | Ok | |
| 24 | 03:13:27:570PM | Plasma | Ok | |
| 25 | 03:26:35:033PM | Plasma | Ok | |
| 26 | 03:44:18:037PM | Plasma | Ok | |
| 27 | 03:57:24:953PM | Plasma | Ok | |
| 28 | 04:10:25:417PM | Plasma | Ok | |
| 29 | 04:26:30:413PM | Plasma | Ok | |
| 30 | 04:43:00:370PM | Plasma | Ok | |
| 31 | 04:56:20:787PM | Plasma | Ok | |