| Miniproposals | ||||||||||||
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| Operators | |
| Session leader(s): | Ian Hutchinson,John Rice |
| Physics operator(s): | Jim Irby |
| Engineering operator(s): | Gary Dekow,Bill Cochran,Frank Silva |
| Engineering Operator Run Comment |
| Irby/Silva |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:20:540PM |
| Author: To Be Determined |
| Run summary for 990521, MP249, Impurity Transport during Ohmic H-mode There were many extended periods of Ohmic ELM-free and EDA H-mode in several of the discharges. These H-modes however were not the most robust, as moderate levels of argon and/or small CaF2 injections often terminated the H-mode. In spite of this the objectives of MP249 were achieved. There was good correlation between the rotation velocities determined by Doppler shifts and from the fast magnetics. Many of the plasmas had large stored energy increases; shot 28 had a stored energy of 160 kJ. Plasma currents as high as 1.44 MA were obtained. Edge Te and x-ray pedestals were measured. The impurity confinement during ELM-free H-modes were much longer than the discharge length, which led to the termination of the H-mode. For EDA Ohmic discharges, the confinement was shorter, but the injection often caused the plasma to return to ELM-free. The main result is that the impurity confinement in Ohmic H-mode plasmas is very similar to ICRF H-mode discharges. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:01:363PM |
| Author: To Be Determined |
| PHYSOP Summary for 990521 MP#249 Impurity Xport in Ohmic H-mode EO Silva/Cochran/Dekow PO Irby SL Rice/Hutch Engineering Setup for 990521: Load from 990305013 ECDC in D2 for two hours before the run Note that the TF will be ramped down from 5.4 to 4 T during the shot Gas setup: B-top - 6 psi of D2 B-side lower - 1 psi of Ar C-side - 30 psi D2 General: Machine ran well with record ohmic H-mode parameters. The cause of a couple of full current disruptions should be investigated. Disruptions were found to affect both br0 and bz0 for the next shot(s) with deltas of over 2 mT. Now that the machine is pretty clean, these variations may be more the cause of post disruption fizzles than gas/wall conditions. We obtained record stored energy for an ohmic H-mode on shot 28. Neutron rate was approaching 10^13/s today, peak density 5e20. Current rise was a little fast and probably should have been tweeked at some point, but since it was running.... SL claims success for MP249. Problems: 03 EF4 crossover com fault. May have been caused by seg1 to seg2 discontinuity in TF programming. Found voltage regulator offset that may have been around for some time --- Bill and Gary will investigate. 16 Com fault in OH2L --- supply okay. EF1 breaker pulled out. 32 Runaway process caused us to abort shot 32 Score: 3 test shots 3 fizzles 25 plasmas ------------- 31 shots ---------------------------------------------------------------------------- 990521001 IRBY PHYSICS_OPERATOR May 21 1999 7:56:22:530AM . . . . . . . . . . . . . . . . . . . . OH2 Commutation test hybrid gas disabled ---------------------------------------------------------------------------- 990521002 IRBY PHYSICS_OPERATOR May 21 1999 8:11:08:826AM . . . . . . . . . . . . . . . . . . . . Plasma attempt ECE, VUV, Laser blowoff, argon puff enabled no plasma ---------------------------------------------------------------------------- 990521003 IRBY PHYSICS_OPERATOR May 21 1999 8:34:19:420AM . . . . . . . . . . . . . . . . . . . . BR0 too small, added .0015 to offset pre-puff pressure was okay for last shot --- no change plasma for 0.5 seconds -- EF4 shoot through --- oh1 crowbar ---------------------------------------------------------------------------- 990521004 IRBY PHYSICS_OPERATOR May 21 1999 9:10:09:263AM . . . . . . . . . . . . . . . . . . . . need to do EF4 crossover test: loaded 990121008 --- ef4 PLC limites set for +-2kA moved fizzle from .08 to 1.3 seconds results: ef4 looks okay, but may have offset in ef4 regulator --- we have had it at least since 1/21/99 ---------------------------------------------------------------------------- 990521005 IRBY PHYSICS_OPERATOR May 21 1999 9:14:33:950AM . . . . . . . . . . . . . . . . . . . . PLC limits to -8 to +4 on EF4 to see if supply follows programming EF4 looks great ---- assume TF jump caused problem at crossover ---------------------------------------------------------------------------- 990521006 IRBY PHYSICS_OPERATOR May 21 1999 9:25:57:250AM . . . . . . . . . . . . . . . . . . . . loading in 990521003 ---- copied TF seg2 to TF seg1 to keep from having TF current glitch good plasma --- ---------------------------------------------------------------------------- 990521007 IRBY PHYSICS_OPERATOR May 21 1999 9:51:22:890AM . . . . . . . . . . . . . . . . . . . . repeat of previous shot John reduced spot size of beam --- to much CaF2 Brian pokes plasma with probe plasma --- several H-modes --- 82 kJ peak ---------------------------------------------------------------------------- 990521008 IRBY PHYSICS_OPERATOR May 21 1999 10:05:40:716AM . . . . . . . . . . . . . . . . . . . . Ar puff extended by 10 ms to 0.412 Bringing up density programming a little earlier --- get H-mode earlier? plasma --- H-modes a little earlier --- 83 kj ---------------------------------------------------------------------------- 990521009 IRBY PHYSICS_OPERATOR May 21 1999 10:25:06:546AM . . . . . . . . . . . . . . . . . . . . Argon disabled good longer lasting H-Modes ---------------------------------------------------------------------------- 990521010 IRBY PHYSICS_OPERATOR May 21 1999 10:40:27:920AM . . . . . . . . . . . . . . . . . . . . Argon enabled but 10 ms shorter pulse: .402 seconds again Ip raised to 800,000 at 0.2704 good H-modes --- next shot w/o argon --- 84 kj ---------------------------------------------------------------------------- 990521011 IRBY PHYSICS_OPERATOR May 21 1999 11:13:18:500AM . . . . . . . . . . . . . . . . . . . . Argon disabled Raised early density from .97 to 1.1 e 20 at 0.291 seconds 111 kj ---------------------------------------------------------------------------- 990521012 IRBY PHYSICS_OPERATOR May 21 1999 11:20:06:280AM . . . . . . . . . . . . . . . . . . . . Raised current from 1.05 to 1.15 MA Raised TF to match Great H-mode --- 127 kj ---------------------------------------------------------------------------- 990521013 IRBY PHYSICS_OPERATOR May 21 1999 11:37:59:250AM . . . . . . . . . . . . . . . . . . . . RXU from .02 to .05 Laser blowoff at 0.75 stopped H-mode, 103 kj ---------------------------------------------------------------------------- 990521014 IRBY PHYSICS_OPERATOR May 21 1999 12:08:20:013PM . . . . . . . . . . . . . . . . . . . . Argon enabled --- width to 25 ms from 30 ms plasma --- 103 kj ---------------------------------------------------------------------------- 990521015 IRBY PHYSICS_OPERATOR May 21 1999 12:17:43:733PM . . . . . . . . . . . . . . . . . . . . Repeat plasma --- not much of an H-mode --- injection near L to H transition ---------------------------------------------------------------------------- 990521016 IRBY PHYSICS_OPERATOR May 21 1999 12:47:24:140PM . . . . . . . . . . . . . . . . . . . . Argon off IC_EF4 raised to 3400 amps at 0.612 seconds ---- Goetz fix for disruptions at higher current Disruption --- com fault on OH2L Plasma for abt 0.46 seconds ---------------------------------------------------------------------------- 990521017 IRBY PHYSICS_OPERATOR May 21 1999 12:59:21:636PM . . . . . . . . . . . . . . . . . . . . repeat - nothing found on power supplies good shot --- not a great H-mode --- looks like CaF2 did it in again ---------------------------------------------------------------------------- 990521018 IRBY PHYSICS_OPERATOR May 21 1999 1:15:58:093PM . . . . . . . . . . . . . . . . . . . . Current up to 1.25 MA TF current to match (127 kA) plasma --- H-mode killed early again ---------------------------------------------------------------------------- 990521019 IRBY PHYSICS_OPERATOR May 21 1999 1:35:27:186PM . . . . . . . . . . . . . . . . . . . . Laser blowoff disabled --- H-mode length? dropped rcur from 0.668 to 0.667 --- give Brian a little better target better plasma, but H-mode still late --- solid EDA --- 132 kj ---------------------------------------------------------------------------- 990521020 IRBY PHYSICS_OPERATOR May 21 1999 1:55:35:123PM . . . . . . . . . . . . . . . . . . . . Argon enabled Fizzle --- startup up bad ---------------------------------------------------------------------------- 990521021 IRBY PHYSICS_OPERATOR May 21 1999 2:07:34:250PM . . . . . . . . . . . . . . . . . . . . bro offset back to 0.000 IC_EF4U to -1300 from -1275 Plasma --- H-mode --- 131 kj ---------------------------------------------------------------------------- 990521022 IRBY PHYSICS_OPERATOR May 21 1999 2:26:39:060PM . . . . . . . . . . . . . . . . . . . . Argon disabled RCUR from 0.667 to 0.665 to give probe a better target Early density to 1.2e20 (t = 0.29 s) Put BR0 offset to 0.0005 T plasma okay ---------------------------------------------------------------------------- 990521023 IRBY PHYSICS_OPERATOR May 21 1999 2:41:50:700PM . . . . . . . . . . . . . . . . . . . . Ip to 1.35 MA Bt to 137 kA to match plasma --- no H-mode until ramp down ---------------------------------------------------------------------------- 990521024 IRBY PHYSICS_OPERATOR May 21 1999 3:01:21:950PM . . . . . . . . . . . . . . . . . . . . Dropped TF current to 132 kA from 137 Dropped early density to 1.1 from 1.2 e 20 Dropped EF4 current beyond 1.13 seconds by about 500 amps to reduce EF2 swing toward zero Strong fizzle ---------------------------------------------------------------------------- 990521025 IRBY PHYSICS_OPERATOR May 21 1999 3:17:47:920PM . . . . . . . . . . . . . . . . . . . . EF4 changed from -1300 to -1310 BR0 dropped by 1 mT --- offset now -.0005 Ian noted that these br/bz tweeks seem to have been required after the disruptions on shot 16 Plasma --- H-modes start a little earlier ---------------------------------------------------------------------------- 990521026 IRBY PHYSICS_OPERATOR May 21 1999 3:42:40:216PM . . . . . . . . . . . . . . . . . . . . We asked Brian to remove his first fsp scan repeat last shot great plasma --- long elm free --- 146 kj ---------------------------------------------------------------------------- 990521027 IRBY PHYSICS_OPERATOR May 21 1999 3:55:39:623PM . . . . . . . . . . . . . . . . . . . . Tweeked Bt current to 132 kA at 0.65 seconds, to 155 kA at 0.75 H-mode started a little later ---------------------------------------------------------------------------- 990521028 IRBY PHYSICS_OPERATOR May 21 1999 4:15:12:450PM . . . . . . . . . . . . . . . . . . . . Ip to 1.45 MA Bt current to 165 kA to match Ip Dropped EF4 by 500 amps beyond 1.34 seconds to help EF2 Good H-mode, start at 0.62 , 158 kj ---------------------------------------------------------------------------- 990521029 IRBY PHYSICS_OPERATOR May 21 1999 4:45:08:390PM . . . . . . . . . . . . . . . . . . . . Changed RCUR by 1mm to .664 from .665 Probe running again Nice disruption --- ---------------------------------------------------------------------------- 990521030 IRBY PHYSICS_OPERATOR May 21 1999 4:56:39:090PM . . . . . . . . . . . . . . . . . . . . Bt "ramp up" delayed by 50 ms to 0.7 seconds Bt current to 170 kA Fizzle ---------------------------------------------------------------------------- 990521031 IRBY PHYSICS_OPERATOR May 21 1999 5:11:53:216PM . . . . . . . . . . . . . . . . . . . . BR0 up 2 mT from -.0005 to .0015 EF4 current to -1275 from -1310 to raise Bz0 disruption at full current |
| Session Leader Comments | |||
| May 21 1999 11:28:15:967AM | 990521006 | John Rice | CaF2 injection at 0.7 s temporarily killed the ELM-free Ohmic H-mode, but it recovered, with an EDA at the edge of the shot. impurity tau from 50 to 117 ms. decent rotation from argon and fast magnetics |
| May 21 1999 11:29:06:153AM | 990521007 | John Rice | CaF2 injection at 0.7 s temporarily killed the ELM-free Ohmic H-mode, but it recovered, with an EDA at the edge of the shot. impurity tau from 50 to 117 ms. decent rotation from argon and fast magnetics |
| May 21 1999 11:30:00:200AM | 990521008 | John Rice | CaF2 injection at 0.8 s , tau of 70 ms. in and out of Ohmic H-mode |
| May 21 1999 11:31:05:263AM | 990521009 | John Rice | CaF2 injection at 0.7 s , tau of 40 ms, increasing to 300 ms during ELM-free Ohmic H-mode. argon disabled, allowing sustained H-mode period |
| May 21 1999 11:31:49:797AM | 990521010 | John Rice | CaF2 injection at 1.05 s argon enabled |
| May 21 1999 11:32:03:123AM | 990521011 | John Rice | CaF2 injection at 1.05 s argon disabled |
| May 21 1999 11:32:49:827AM | 990521012 | John Rice | no CaF2 injection argon disabled higher current, long EDA |
| May 21 1999 11:45:34:250AM | 990521013 | John Rice | CaF2 injection .75s, infinite confinement until plasma goes out of H-mode argon disabled |
| May 21 1999 12:01:56:983PM | 990521014 | John Rice | CaF2 injection .75s, before EDA, L-mode tau argon enabled, 25 ms pulse |
| May 21 1999 12:18:40:280PM | 990521015 | John Rice | CaF2 injection .8s, argon enabled, 25 ms pulse this combination was too much for the H-mode |
| May 21 1999 12:53:43:233PM | 990521016 | John Rice | CaF2 injection .8s, argon disabled early disruption |
| May 21 1999 12:59:10:920PM | 990521017 | John Rice | CaF2 injection .8s, knocked it out of H-mode argon disabled He beam on |
| May 21 1999 01:16:33:920PM | 990521018 | John Rice | CaF2 injection .8s, 1/4 spot size, still killed it argon disabled |
| May 21 1999 01:50:14:297PM | 990521019 | John Rice | no CaF2 injection argon disabled He beam on good EDA |
| May 21 1999 02:14:19:793PM | 990521021 | John Rice | no CaF2 injection argon enabled, short ELM-free He beam on |
| May 21 1999 02:23:51:717PM | 990521021 | John Rice | CaF2 injection .8s, 1/8 spot, infinite confinement argon disabled |
| May 21 1999 02:41:24:450PM | 990521022 | John Rice | CaF2 injection .8s, 1/8 spot, infinite confinement argon disabled |
| May 21 1999 02:45:43:997PM | 990521023 | John Rice | CaF2 injection .85s, 1/20 spot, 40 ms tau, late H-mode argon disabled |
| May 21 1999 03:42:36:937PM | 990521026 | John Rice | CaF2 injection 1.1s, 1/20 spot, missed H-mode argon disabled |
| May 21 1999 03:58:54:640PM | 990521027 | John Rice | CaF2 injection .9s, 1/20 spot, killed H-mode argon enabled |
| May 21 1999 04:25:16:967PM | 990521028 | John Rice | no CaF2 injection argon enabled |
| Physics Operator Comments | |||
| May 21 1999 07:56:22:530AM | 990521001 | Jim Irby | OH2 Commutation test |
| May 21 1999 07:57:25:857AM | 990521001 | Jim Irby | hybrid gas disabled |
| May 21 1999 08:11:08:827AM | 990521002 | Jim Irby | Plasma attempt ECE, VUV, Laser blowoff, argon puff enabled no plasma |
| May 21 1999 08:34:19:420AM | 990521003 | Jim Irby | BR0 too small, added .0015 to offset pre-puff pressure was okay for last shot --- no change plasma for 0.5 seconds -- EF4 shoot through --- oh1 crowbar |
| May 21 1999 09:10:09:263AM | 990521004 | Jim Irby | need to do EF4 crossover test: loaded 990121008 --- ef4 PLC limites set for +-2kA moved fizzle from .08 to 1.3 seconds results: ef4 looks okay, but may have offset in ef4 regulator --- we have had it at least since 1/21/99 |
| May 21 1999 09:14:33:950AM | 990521005 | Jim Irby | PLC limits to -8 to +4 on EF4 to see if supply follows programming EF4 looks great ---- assume TF jump caused program at crossover |
| May 21 1999 09:25:57:250AM | 990521006 | Jim Irby | loading in 990521003 ---- copied TF seg2 to TF seg1 to keep from having TF current glitch good plasma --- |
| May 21 1999 09:51:22:890AM | 990521007 | Jim Irby | repeat of previous shot John reduced spot size of beam --- to much CaF2 Brian pokes plasma with probe plasma --- several H-modes --- 82 kJ peak |
| May 21 1999 10:05:40:717AM | 990521008 | Jim Irby | Ar puff extended by 10 ms to 0.412 Bringing up density programming a little earlier --- get H-mode earlier? plasma --- H-modes a little earlier --- 83 kj |
| May 21 1999 10:25:06:547AM | 990521009 | Jim Irby | Argon disabled good longer lasting H-Modes |
| May 21 1999 10:40:27:920AM | 990521010 | Jim Irby | Argon enabled but 10 ms shorter pulse: .402 seconds again Ip raised to 800,000 at 0.2704 good H-modes --- next shot w/o argon --- 84 kj |
| May 21 1999 11:13:18:500AM | 990521011 | Jim Irby | Argon disabled Raised early density from .97 to 1.1 e 20 at 0.291 seconds 111 kj |
| May 21 1999 11:20:06:280AM | 990521012 | Jim Irby | Raised current from 1.05 to 1.15 MA Raised TF to match Great H-mode --- 127 kj |
| May 21 1999 11:37:59:250AM | 990521013 | Jim Irby | RXU from .02 to .05 Laser blowoff at 0.75 stopped H-mode, 103 kj |
| May 21 1999 12:08:20:013PM | 990521014 | Jim Irby | Argon enabled --- width to 25 ms from 30 ms plasma --- 103 kj |
| May 21 1999 12:17:43:733PM | 990521015 | Jim Irby | Repeat plasma --- not much of an H-mode --- injection near L to H transition |
| May 21 1999 12:47:24:140PM | 990521016 | Jim Irby | Argon off IC_EF4 raised to 3400 amps at 0.612 seconds ---- Goetz fix for disruptions at higher current Disruption --- com fault on OH2L Plasma for abt 0.46 seconds |
| May 21 1999 12:59:21:637PM | 990521017 | Jim Irby | repeat - nothing found on power supplies good shot --- not a great H-mode --- looks like CaF2 did it in again |
| May 21 1999 01:15:58:093PM | 990521018 | Jim Irby | Current up to 1.25 MA TF current to match (127 kA) plasma --- H-mode killed early again |
| May 21 1999 01:35:27:187PM | 990521019 | Jim Irby | Laser blowoff disabled --- H-mode length? dropped rcur from 0.668 to 0.667 --- give Brian a little better target better plasma, but H-mode still late --- solid EDA --- 132 kj |
| May 21 1999 01:55:35:123PM | 990521020 | Jim Irby | Argon enabled Fizzle --- startup up bad |
| May 21 1999 02:07:34:250PM | 990521021 | Jim Irby | bro offset back to 0.000 IC_EF4U to -1300 from -1275 Plasma --- H-mode --- 131 kj |
| May 21 1999 02:26:39:060PM | 990521022 | Jim Irby | Argon disabled RCUR from 0.667 to 0.665 to give probe a better target Early density to 1.2e20 (t = 0.29 s) Put BR0 offset to 0.0005 T plasma okay |
| May 21 1999 02:41:50:700PM | 990521023 | Jim Irby | Ip to 1.35 MA Bt to 137 kA to match plasma --- no H-mode until ramp down |
| May 21 1999 03:01:21:950PM | 990521024 | Jim Irby | Dropped TF current to 132 kA from 137 Dropped early density to 1.1 from 1.2 e 20 Dropped EF4 current beyond 1.13 seconds by about 500 amps to reduce EF2 swing toward zero Strong fizzle |
| May 21 1999 03:17:47:920PM | 990521025 | Jim Irby | EF4 changed from -1300 to -1310 BR0 dropped by 1 mT --- offset now -.0005 Ian noted that these br/bz tweeks seem to have been required after the distruption on shot 16 Plasma --- H-modes start a little earlier |
| May 21 1999 03:42:40:217PM | 990521026 | Jim Irby | We asked Brian to remove his first fsp scan repeat last shot great plasma --- long elm free --- 146 kj |
| May 21 1999 03:55:39:623PM | 990521027 | Jim Irby | Tweeked Bt current to 132 kA at 0.65 seconds, to 155 kA at 0.75 H-mode started a little later |
| May 21 1999 04:15:12:450PM | 990521028 | Jim Irby | Ip to 1.45 MA Bt current to 165 kA to match Ip Dropped EF4 by 500 amps beyond 1.34 seconds to help EF2 Good H-mode, start at 0.62 , 158 kj |
| May 21 1999 04:45:08:390PM | 990521029 | Jim Irby | Changed RCUR by 1mm to .664 from .665 Probe running again Nice disruption --- |
| May 21 1999 04:56:39:090PM | 990521030 | Jim Irby | Bt "ramp up" delayed by 50 ms to 0.7 seconds Bt current to 170 kA Fizzle |
| May 21 1999 05:11:53:217PM | 990521031 | Jim Irby | BR0 up 2 mT from -.0005 to .0015 EF4 current to -1275 from -1310 to raise Bz0 disruption at full current |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 07:57:55:577AM | Test | Ok | OH2 comm. test 10KA/1395commvolts OK |
| 2 | 08:08:19:513AM | Plasma | Ok | no faults/fizzel |
| 3 | 08:21:10:920AM | Plasma | Bad | Power supply problems, caused disruption |
| 4 | 08:54:07:967AM | Test | Ok | EF4 test ????? |
| 5 | 09:11:58:217AM | Test | Ok | EF4 pulse test hybrid control OK |
| 6 | 09:22:25:513AM | Test | Ok | no faults/plasma |
| 7 | 09:37:42:200AM | Plasma | Ok | no faults/plasma |
| 8 | 09:58:07:373AM | Plasma | Ok | no faults/plasma |
| 9 | 10:16:14:250AM | Plasma | Ok | no faults/plasma |
| 10 | 10:36:08:060AM | Plasma | Ok | no faults/plasma |
| 11 | 10:53:17:623AM | Plasma | Ok | no faults/plasma |
| 12 | 11:12:36:140AM | Plasma | Ok | no faults/plasma |
| 13 | 11:32:57:920AM | Plasma | Ok | no faults/plasma |
| 14 | 11:55:38:500AM | Plasma | Ok | no faults/plasma |
| 15 | 12:12:07:420PM | Plasma | Ok | no faults/plasma |
| 16 | 12:33:40:670PM | Plasma | Bad | OH2l comm fault after plasma disruption |
| 17 | 12:54:45:717PM | Plasma | Ok | no faults/plasma |
| 18 | 01:10:11:683PM | Plasma | Ok | No Faults / Plasma |
| 19 | 01:30:13:810PM | Plasma | Ok | No Faults / Plasma |
| 20 | 01:48:16:403PM | Plasma | Ok | No Faults |
| 21 | 02:03:47:513PM | Plasma | Ok | No Faults |
| 22 | 02:19:37:547PM | Plasma | Ok | No Faults |
| 23 | 02:39:43:420PM | Plasma | Ok | No Faults |
| 24 | 02:58:43:467PM | Plasma | Ok | No Faults |
| 25 | 03:14:46:047PM | Plasma | Ok | No Faults |
| 26 | 03:33:01:780PM | Plasma | Ok | No Faults / plasma |
| 27 | 03:52:14:857PM | Plasma | Ok | No Faults |
| 28 | 04:11:18:403PM | Plasma | Ok | No Faults |
| 29 | 04:32:39:890PM | Plasma | Ok | No Faults / Plasma |
| 30 | 04:53:36:030PM | Plasma | Ok | No Faults |
| 31 | 05:07:53:653PM | Plasma | Ok | No Faults |
| 32 | 05:38:57:480PM | Test | Bad | |