| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Earl Marmar |
| Physics operator(s): | Jim Irby |
| Engineering operator(s): | Ed Fitzgerald,Bill Cochran |
| Engineering Operator Run Comment |
| MP 318 High Performance Operation at 5T. Marmar/Irby/Cochran/Parkin. |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:30:397PM |
| Author: To Be Determined |
| Session leader run summary - 1020903 SL Marmar PO Irby Nominally we were running MP318, High performance operation at 5 Tesla. The run was devoted to some attempts to understand the RF heating and confinement at high input power and plasma current. Observations: Raising the target density seemed to make things a little worse. 1 MA was better that 1.2; the 1.0 MA shots were marginally EDA heading to ELM-free. The 1.2 MA shots were pretty clearly ELM-free, with sub L-Mode confinement in H-Mode. H-factors in ohmic portions of shots were low, and systematically got lower with increasing plasma current. This may simply be the result of EFIT getting l_i/2 slightly wrong for very low beta_p discharges, but perhaps bears further investigation. Best shots of the day, in terms of performance, were probably 4, 7, 17, and 19, but they were not great. The interferometer signal was not available for shot 17, so it's not in the table of H-factors. On shot 26, the upper triangularity was increased to 0.4 (from 0.35 on previous shots) with no obvious benefit; q_95 only increased from 3.0 to 3.1. shot I_p(MA) H_89(ohmic) P_RF(MW) H89(RF) 3 0.8 0.72 1.4 0.86 4 1.0 0.67 1.75 1.3 5 1.0 0.70 2.6 to 3.6 1.3 (very briefly) 7 1.0 0.67 3.9 1.27 12 1.0 0.66 3.9 1.14 19 1.0 0.65 4.4 1.24 21 1.0 0.64 4.7 0.94 23 1.2 0.57 4.6 0.90 26 1.2 0.59 4.3 0.86 |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:16:037PM |
| Author: To Be Determined |
| MP 318 High Performance Operation at 5T SL: Marmar PO: Irby EO: Cochran, Fitzgerald ECDC was run from 6:00 to 8:00 in deuterium before the run. The run began at 10:00 as scheduled to allow time for alternator maintenance and warmup. We continued to have problems with the startup. Reliability was only 50%. However, some of the fizzles probably resulted from recovery problems following 1 to 1.2 MA disruptions. The disruptions were the result of operator errors involved with getting a good rampdown. To get rid of the fizzles adjustments were made to all the usual parameters including gas, bz0, and br0. ECDC between shots, following disruptions, also seemed to help (5 minutes, D2 at 2e-4 Torr). We also noted some jumps in the Bz0 and Br0 following disruptions. The rf systems supplied over 4.5 MW to the plasma today. We were not seeing much benefit from this power however. As I'm sure Earl will detail in his report, both ohmic and rf heated plasma performance is poor. We had two lost cycles because of an EF1 com bank failed to charge indication. This problem is being debugged. Duds 01 Fizzles 12 Plasmas 11 EF1 problems 02 Cycles 26 Entry display output on Wed Sep 4 11:40:29 2002 ---------------------------------------------------------------------------- 1020903001 irby PHYSICS_OPERATOR Sep 3 2002 10:12:28:200AM . . . . . . . . . . . . . . . . . . . . No PCS changes from Friday's run --- probably a mistake Fizzle --- almost went > 30 kA Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 1.3427 -13.2692 -25.6043 -22.6955 dIp/dt (kA/ms): -1.3680 -2.7374 -1.8764 -0.1759 pressure (mTorr): 0.0385 0.0403 0.0399 0.0431 Bz0 (mT): -3.6838 -1.3352 0.4601 17.6417 Br0 (mT): 0.2379 -0.1424 -0.3198 -0.2177 Bz0 is low compared to last Friday, but it may change on the next shot; so no changes. ---------------------------------------------------------------------------- 1020903002 irby PHYSICS_OPERATOR Sep 3 2002 10:26:47:146AM . . . . . . . . . . . . . . . . . . . . Another fizzle --- Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 1.3512 -12.2760 -27.5254 -27.5396 dIp/dt (kA/ms): -1.3685 -2.8785 -2.2607 1.4146 pressure (mTorr): 0.0344 0.0329 0.0333 0.0341 Bz0 (mT): -3.1024 -0.5092 0.5050 17.4647 Br0 (mT): 0.1988 -0.1887 -0.2317 -0.2426 Bz0 did go up. Prepuff does look low --- increase for next shot Got more Ip ~ 40 kA CII level down a factor of three from first shot ---------------------------------------------------------------------------- 1020903003 irby PHYSICS_OPERATOR Sep 3 2002 10:48:01:286AM . . . . . . . . . . . . . . . . . . . . Increased pre-puff by 2 ms to 25 ms Plasma --- h-mode from .6 to 1.5 s W at 72 kJ, radiated power pretty high during rf ---------------------------------------------------------------------------- 1020903004 irby PHYSICS_OPERATOR Sep 3 2002 11:05:35:126AM . . . . . . . . . . . . . . . . . . . . Increased Ip to 1000 kA from 800 kA Plasma --- a couple of h-modes H/D creeping up. Will start ECDC after next shot ---------------------------------------------------------------------------- 1020903005 irby PHYSICS_OPERATOR Sep 3 2002 11:19:46:256AM . . . . . . . . . . . . . . . . . . . . Dropped TF current from 154 to 145 kA: Field to 5.1 T from 5.4 dW 70 kJ for 2.5 MW --- not too far off the curve ---------------------------------------------------------------------------- 1020903006 irby PHYSICS_OPERATOR Sep 3 2002 11:41:46:840AM . . . . . . . . . . . . . . . . . . . . ECDC for 5 minutes before shot --- drop H/D? TF current from 145 to 143 to get us to 5.1 T Pre-puff back to 23 ms ---- ecdc effect Fizzle Pressure was high relative to shot 5 --- .0451 vs .0417 ---------------------------------------------------------------------------- 1020903007 irby PHYSICS_OPERATOR Sep 3 2002 11:57:56:786AM . . . . . . . . . . . . . . . . . . . . RF from 0.8 to 1.3 s Plasma, but disruption --- vertical instability ---------------------------------------------------------------------------- 1020903008 irby PHYSICS_OPERATOR Sep 3 2002 12:11:09:890PM . . . . . . . . . . . . . . . . . . . . Moved rampdown from 1.5 to 1.3 s strong fizzle ---------------------------------------------------------------------------- 1020903009 irby PHYSICS_OPERATOR Sep 3 2002 12:28:11:870PM . . . . . . . . . . . . . . . . . . . . Br0 tweaked from .002 to .0015 T. Shot 008: Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 1.3427 -19.1009 -33.0441 -31.1144 dIp/dt (kA/ms): -2.1017 -3.3873 -1.7491 -0.0781 pressure (mTorr): 0.0412 0.0408 0.0394 0.0385 Bz0 (mT): -2.8265 -0.5472 0.3797 14.4197 Br0 (mT): 0.1744 0.2265 0.3651 -0.2322 Fizzle --- forgot to load the Br0 tweak Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 1.9888 -18.1361 -33.3770 -33.3884 dIp/dt (kA/ms): -1.9740 -3.5145 -2.2416 1.0666 Bz0 (mT): -2.0775 0.1742 1.1251 15.5779 Br0 (mT): 0.3264 0.2090 0.1928 -0.2124 ---------------------------------------------------------------------------- 1020903010 irby PHYSICS_OPERATOR Sep 3 2002 12:41:36:670PM . . . . . . . . . . . . . . . . . . . . Loaded Br0 tweak Increased pre-puff from 23 to 24 ms fizzle ---- Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 2.0030 -17.8031 -36.3000 -33.7157 dIp/dt (kA/ms): -1.7982 -3.8668 -2.4013 1.2240 pressure (mTorr): 0.0377 0.0390 0.0385 0.0352 Bz0 (mT): -1.5421 0.2847 0.4003 14.8565 Br0 (mT): -0.2836 -0.3069 -0.1414 -0.6825 ---------------------------------------------------------------------------- 1020903011 irby PHYSICS_OPERATOR Sep 3 2002 12:56:59:380PM . . . . . . . . . . . . . . . . . . . . Increased pre-puff again to 26 ms fizzle --- next tweak Bz0 Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 1.6813 -19.1095 -34.3532 -32.0991 dIp/dt (kA/ms): -2.0058 -3.5805 -2.1304 1.5753 pressure (mTorr): 0.0408 0.0426 0.0408 0.0373 Bz0 (mT): -1.7336 0.1668 0.8254 15.1149 Br0 (mT): -0.2734 -0.2035 -0.2482 -0.5375 ---------------------------------------------------------------------------- 1020903012 irby PHYSICS_OPERATOR Sep 3 2002 1:13:04:483PM . . . . . . . . . . . . . . . . . . . . EF4 from -1315 to -1330 Amps Plasma into rampdown but did disrupt ---- forgot to tweak elongation ---------------------------------------------------------------------------- 1020903013 irby PHYSICS_OPERATOR Sep 3 2002 1:47:10:723PM . . . . . . . . . . . . . . . . . . . . Nl04 increased to 9e19 from 8e19 /m^2 moved rcur and clearin changes to 1.3 s from 1.5 s ---------------------------------------------------------------------------- 1020903014 irby PHYSICS_OPERATOR Sep 3 2002 2:14:45:283PM . . . . . . . . . . . . . . . . . . . . Changed density feedback to Z-Meter: loaded seg 2, wire 14 --- shot 1010621001 EF1 did not charge --- waiting for igor ---------------------------------------------------------------------------- 1020903015 irby PHYSICS_OPERATOR Sep 4 2002 9:00:14:166AM . . . . . . . . . . . . . . . . . . . . fizzle ---------------------------------------------------------------------------- 1020903016 irby PHYSICS_OPERATOR Sep 4 2002 9:00:24:040AM . . . . . . . . . . . . . . . . . . . . fizzle ---------------------------------------------------------------------------- 1020903017 irby PHYSICS_OPERATOR Sep 3 2002 2:57:19:020PM . . . . . . . . . . . . . . . . . . . . No changes. Try again Plasma, but lost it at 1.48 s Got 150 kJ H/D at 7% ---------------------------------------------------------------------------- 1020903018 irby PHYSICS_OPERATOR Sep 3 2002 3:08:10:753PM . . . . . . . . . . . . . . . . . . . . moved gain increase on z-meter feedback to .1 s from .2 s ramped clearin down faster starting at 1.3 ramped rcu in faster starting at 1.3 fizzle --- looks like gas creeped up a little ---------------------------------------------------------------------------- 1020903019 irby PHYSICS_OPERATOR Sep 3 2002 3:19:14:430PM . . . . . . . . . . . . . . . . . . . . Reduced prefill by 2 ms Plasma --- good rampdown 140 kJ, but it takes 4.4 MW to do it. density still low ---------------------------------------------------------------------------- 1020903020 irby PHYSICS_OPERATOR Sep 3 2002 3:34:55:796PM . . . . . . . . . . . . . . . . . . . . increased z-meter feedback request to 0.3 from 0.25 added 1 ms to pulsed gas dud ----- ---------------------------------------------------------------------------- 1020903021 irby PHYSICS_OPERATOR Sep 3 2002 3:51:05:523PM . . . . . . . . . . . . . . . . . . . . Turned off argon Did 5 minutes of ECDC in D2 at 2e-4 Torr Reduced prefill by 2 ms, now 23 ms plasma for 1.42 s h/d 5 to 8 % --- a little better ---------------------------------------------------------------------------- 1020903022 irby PHYSICS_OPERATOR Sep 3 2002 4:06:53:800PM . . . . . . . . . . . . . . . . . . . . Ip to 1.2 MA from 1.0 MA 5 minutes ECDC before shot fizzle ---------------------------------------------------------------------------- 1020903023 irby PHYSICS_OPERATOR Sep 3 2002 4:27:21:236PM . . . . . . . . . . . . . . . . . . . . Reduced argon pressure to 1 psi from 1.8. No PCS changes Plasma to 1.37 s Got 1.17 MA, but only 130 kJ with 4.5 MW ---------------------------------------------------------------------------- 1020903024 irby PHYSICS_OPERATOR Sep 3 2002 4:42:45:713PM . . . . . . . . . . . . . . . . . . . . Changed RXU from -.02 to -.03 to increase upper triangularity fizzle jump in Br0 and Bz0 possibly from disruption ---------------------------------------------------------------------------- 1020903025 irby PHYSICS_OPERATOR Sep 3 2002 4:54:20:683PM . . . . . . . . . . . . . . . . . . . . Br0 offset from 0.0015 to 0.00125 fizzle! ---------------------------------------------------------------------------- 1020903026 irby PHYSICS_OPERATOR Sep 4 2002 8:57:44:803AM . . . . . . . . . . . . . . . . . . . . Nice Plasma, but ended in 1 MA disruption 120 kJ, 4.3 MW ---------------------------------------------------------------------------- 1020903xxx irby PHYSICS_OPERATOR Sep 3 2002 7:29:01:980AM . . . . . . . . . . . . . . . . . . . . Did coldstart: rtnode -- data loaded, A matrix responds rtnode -- data loaded, M matrix responds rtnode -- data loaded, PID matrix responds RT_NODE Done 3-SEP-2002 07:27:02.34 ---------------------------------------------------------------------------- 1020903xxx irby PHYSICS_OPERATOR Sep 3 2002 8:07:58:243AM . . . . . . . . . . . . . . . . . . . . Engineering Setup for Tuesday, September 3,2002 MP 318 High Performance Operation at 5T SL: Marmar PO: Irby ECDC from 6:00 to 8:00 in deuterium before the run. Run Begins at 10:00 and ends at 17:00 Power systems setup as for Shot 1020830031 Gas setup: B-Top 6 psi D2 Hybrid Enabled (PG4) B-side lower 1 psi Ar Hybrid Enabled (PG1) B-side upper 10 psi D2 Hybrid DISABLED (PG2, for ECDC) C-Side 30 psi D2 Hybrid Enabled (PG3) J-Bottom leave as is, Hybrid DISABLED Enable the following gate valves ECE, VUV RF Setup: Transmitters 1,2,3,4 in Run On by 08:00 RUN PLAN: Though we hope to run MP318 eventually, but we will start out spending the time required to understand the poor performance of the machine (low stored energy for given input power). This process will probably involve some parameter scans at rf levels that can be reliably produced shot-to-shot, though I'm sure there will be many suggestions. |
| Session Leader Comments | |||
| Sep 3 2002 10:11:02:840AM | Earl Marmar | Nominally running MP 318 High Performance Operation at 5T. We'll concentrate on trying to understand the confinement and RF heating at high power. | |
| Sep 3 2002 10:11:14:073AM | 1020903001 | Earl Marmar | fizzle |
| Sep 3 2002 10:29:28:133AM | 1020903002 | Earl Marmar | fizzle |
| Sep 3 2002 10:52:37:607AM | 1020903003 | Earl Marmar | plasma 5.4 Tesla, .8 MA fairly steady RF from D & J, E tripping when J is on. 70 kJ stored energy with ~2.5 MW (some on, some off axis) |
| Sep 3 2002 11:24:42:170AM | 1020903004 | Earl Marmar | plasma 5.4 Tesla, 1 MA First H-mode is decent; 1.7 MW, 100 kJ stored energy H-factor looks low during initial ohmic phase (H_L ~ .7), goes up to 1.4 in first H-Mode |
| Sep 3 2002 11:27:13:347AM | 1020903005 | Earl Marmar | plasma 5.2 Tesla, 1 MA First H-mode is decent; 3.4 MW, 120 kJ stored energy H_L ~ 1.4; looking somewhat ELM-free (density and Prad climbing) |
| Sep 3 2002 11:32:45:387AM | 1020903006 | Earl Marmar | ECDC for 5 minutes before shot fizzle |
| Sep 3 2002 11:54:53:657AM | 1020903007 | Earl Marmar | plasma 137 kJ, 3.9 MW Radiated power rising during first H-Mode, but neutron rate is pretty flat until RF trip |
| Sep 3 2002 12:05:27:250PM | 1020903008 | Earl Marmar | fizzle |
| Sep 3 2002 12:25:07:490PM | 1020903009 | Earl Marmar | fizzle |
| Sep 3 2002 12:47:33:460PM | 1020903010 | Earl Marmar | fizzle |
| Sep 3 2002 12:47:40:680PM | 1020903011 | Earl Marmar | fizzle |
| Sep 3 2002 01:33:42:140PM | 1020903012 | Earl Marmar | plasma some 4 MW periods; very mediocre stored energy |
| Sep 3 2002 01:36:20:550PM | 1020903013 | Earl Marmar | plasma density feedback failed; gas on full the whole shot no RF; disrupt at 1.3 s |
| Sep 3 2002 02:17:35:113PM | 1020903014 | Earl Marmar | no power cycle |
| Sep 3 2002 02:17:44:287PM | 1020903015 | Earl Marmar | fizzle |
| Sep 3 2002 02:38:17:130PM | 1020903016 | Earl Marmar | no-power cycle |
| Sep 3 2002 03:00:35:883PM | 1020903017 | Earl Marmar | plasma 150 kJ, between 2 and 4 MW; no interferometer signal |
| Sep 3 2002 03:00:43:743PM | 1020903018 | Earl Marmar | fizzle |
| Sep 3 2002 03:21:54:243PM | 1020903019 | Earl Marmar | plasma ~140 kJ, ~4 MW Density was about the same as shot 17 |
| Sep 3 2002 03:40:30:413PM | 1020903020 | Earl Marmar | dud |
| Sep 3 2002 04:07:49:143PM | 1020903021 | Earl Marmar | plasma poor stored energy; no argon |
| Sep 3 2002 05:29:27:880PM | 1020903022 | Earl Marmar | fizzle |
| Sep 3 2002 04:31:24:070PM | 1020903023 | Earl Marmar | plasma 1.2 MA Short ELM-free H-Mode near start of RF (4.6 MW) Gets to 130 kJ, then RF reduced to 3.3 MW and stored energy rolls off |
| Sep 3 2002 04:35:15:090PM | 1020903024 | Earl Marmar | fizzle |
| Sep 3 2002 04:50:50:443PM | 1020903025 | Earl Marmar | fizzle |
| Sep 3 2002 05:22:03:443PM | 1020903026 | Earl Marmar | plasma 1.2 MA, higher delta_upper (0.4 vs 0.3 on previous shots) in and out of ELM-free H-mode; RF power between 2 and 4 MW poor confinement (no ECE data) |
| Physics Operator Comments | |||
| Sep 3 2002 07:29:01:980AM | Jim Irby | Did coldstart: rtnode -- data loaded, A matrix responds rtnode -- data loaded, M matrix responds rtnode -- data loaded, PID matrix responds RT_NODE Done 3-SEP-2002 07:27:02.34 | |
| Sep 3 2002 08:07:58:243AM | Jim Irby | Engineering Setup for Tuesday, September 3,2002 MP 318 High Performance Operation at 5T SL: Marmar PO: Irby ECDC from 6:00 to 8:00 in deuterium before the run. Run Begins at 10:00 and ends at 17:00 Power systems setup as for Shot 1020830031 Gas setup: B-Top 6 psi D2 Hybrid Enabled (PG4) B-side lower 1 psi Ar Hybrid Enabled (PG1) B-side upper 10 psi D2 Hybrid DISABLED (PG2, for ECDC) C-Side 30 psi D2 Hybrid Enabled (PG3) J-Bottom leave as is, Hybrid DISABLED Enable the following gate valves ECE, VUV RF Setup: Transmitters 1,2,3,4 in Run On by 08:00 RUN PLAN: Though we hope to run MP318 eventually, but we will start out spending the time required to understand the poor performance of the machine (low stored energy for given input power). This process will probably involve some parameter scans at rf levels that can be reliably produced shot-to-shot, though I'm sure there will be many suggestions. | |
| Sep 3 2002 10:12:28:200AM | 1020903001 | Jim Irby | No PCS changes --- probably a mistake Fizzle --- almost went > 30 kA Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 1.3427 -13.2692 -25.6043 -22.6955 dIp/dt (kA/ms): -1.3680 -2.7374 -1.8764 -0.1759 pressure (mTorr): 0.0385 0.0403 0.0399 0.0431 Bz0 (mT): -3.6838 -1.3352 0.4601 17.6417 Br0 (mT): 0.2379 -0.1424 -0.3198 -0.2177 Bz0 is low compared to last Friday, but it may change on the next shot; so no changes. |
| Sep 3 2002 10:26:47:147AM | 1020903002 | Jim Irby | Another fizzle --- Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 1.3512 -12.2760 -27.5254 -27.5396 dIp/dt (kA/ms): -1.3685 -2.8785 -2.2607 1.4146 pressure (mTorr): 0.0344 0.0329 0.0333 0.0341 Bz0 (mT): -3.1024 -0.5092 0.5050 17.4647 Br0 (mT): 0.1988 -0.1887 -0.2317 -0.2426 Bz0 did go up. Prepuff does look low --- increase for next shot Got more Ip ~ 40 kA CII level down a factor of three from first shot |
| Sep 3 2002 10:48:01:287AM | 1020903003 | Jim Irby | Increased pre-puff by 2 ms to 25 ms Plasma --- h-mode from .6 to 1.5 s W at 72 kJ, radiated power pretty high during rf |
| Sep 3 2002 11:05:35:127AM | 1020903004 | Jim Irby | Increased Ip to 1000 kA from 800 kA Plasma --- a couple of h-modes H/D creeping up. Will start ECDC after next shot |
| Sep 3 2002 11:19:46:257AM | 1020903005 | Jim Irby | Dropped TF current from 154 to 145 kA: Field to 5.1 T from 5.4 dW 70 kJ for 2.5 MW --- not too far off the curve |
| Sep 3 2002 11:41:46:840AM | 1020903006 | Jim Irby | ECDC for 5 minutes before shot --- drop H/D? TF current from 145 to 143 to get us to 5.1 T Pre-puff back to 23 ms ---- ecdc effect Fizzle Pressure was high relative to shot 5 --- .0451 vs .0417 |
| Sep 3 2002 11:57:56:787AM | 1020903007 | Jim Irby | RF from 0.8 to 1.3 s Plasma, but disruption --- vertical instability |
| Sep 3 2002 12:11:09:890PM | 1020903008 | Jim Irby | Moved rampdown from 1.5 to 1.3 s strong fizzle |
| Sep 3 2002 12:28:11:870PM | 1020903009 | Jim Irby | Br0 tweaked from .002 to .0015 T. Shot 008: Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 1.3427 -19.1009 -33.0441 -31.1144 dIp/dt (kA/ms): -2.1017 -3.3873 -1.7491 -0.0781 pressure (mTorr): 0.0412 0.0408 0.0394 0.0385 Bz0 (mT): -2.8265 -0.5472 0.3797 14.4197 Br0 (mT): 0.1744 0.2265 0.3651 -0.2322 Fizzle --- forgot to load the Br0 tweak Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 1.9888 -18.1361 -33.3770 -33.3884 dIp/dt (kA/ms): -1.9740 -3.5145 -2.2416 1.0666 Bz0 (mT): -2.0775 0.1742 1.1251 15.5779 Br0 (mT): 0.3264 0.2090 0.1928 -0.2124 |
| Sep 3 2002 12:41:36:670PM | 1020903010 | Jim Irby | Loaded Br0 tweak Increased pre-puff from 23 to 24 ms fizzle ---- Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 2.0030 -17.8031 -36.3000 -33.7157 dIp/dt (kA/ms): -1.7982 -3.8668 -2.4013 1.2240 pressure (mTorr): 0.0377 0.0390 0.0385 0.0352 Bz0 (mT): -1.5421 0.2847 0.4003 14.8565 Br0 (mT): -0.2836 -0.3069 -0.1414 -0.6825 |
| Sep 3 2002 12:56:59:380PM | 1020903011 | Jim Irby | Increased pre-puff again to 26 ms fizzle --- next tweak Bz0 Time (ms): 0 5 10 25 ---------------------------------------- Ip (kA): 1.6813 -19.1095 -34.3532 -32.0991 dIp/dt (kA/ms): -2.0058 -3.5805 -2.1304 1.5753 pressure (mTorr): 0.0408 0.0426 0.0408 0.0373 Bz0 (mT): -1.7336 0.1668 0.8254 15.1149 Br0 (mT): -0.2734 -0.2035 -0.2482 -0.5375 |
| Sep 3 2002 01:13:04:483PM | 1020903012 | Jim Irby | EF4 from -1315 to -1330 Amps Plasma into rampdown but did disrupt ---- forgot to tweak elongation |
| Sep 3 2002 01:47:10:723PM | 1020903013 | Jim Irby | Nl04 increased to 9e19 from 8e19 /m^2 moved rcur and clearin changes to 1.3 s from 1.5 s |
| Sep 3 2002 02:14:45:283PM | 1020903014 | Jim Irby | Changed density feedback to Z-Meter: loaded seg 2, wire 14 --- shot 1010621001 EF1 did not charge --- waiting for igor |
| Sep 4 2002 09:00:14:167AM | 1020903015 | Jim Irby | fizzle |
| Sep 4 2002 09:00:24:040AM | 1020903016 | Jim Irby | fizzle |
| Sep 3 2002 02:57:19:020PM | 1020903017 | Jim Irby | No changes. Try again Plasma, but lost it at 1.48 s Got 150 kJ H/D at 7% |
| Sep 3 2002 03:08:10:753PM | 1020903018 | Jim Irby | moved gain increase on z-meter feedback to .1 s from .2 s ramped clearin down faster starting at 1.3 ramped rcu in faster starting at 1.3 fizzle --- looks like gas creeped up a little |
| Sep 3 2002 03:19:14:430PM | 1020903019 | Jim Irby | Reduced prefill by 2 ms Plasma --- good rampdown 140 kJ, but it takes 4.4 MW to do it. density still low |
| Sep 3 2002 03:34:55:797PM | 1020903020 | Jim Irby | increased z-meter feedback request to 0.3 from 0.25 added 1 ms to pulsed gas dud ----- |
| Sep 3 2002 03:51:05:523PM | 1020903021 | Jim Irby | Turned off argon Did 5 minutes of ECDC in D2 at 2e-4 Torr Reduced prefill by 2 ms, now 23 ms plasma for 1.42 s h/d 5 to 8 % --- a little better |
| Sep 3 2002 04:06:53:800PM | 1020903022 | Jim Irby | Ip to 1.2 MA from 1.0 MA 5 minutes ECDC before shot fizzle |
| Sep 3 2002 04:27:21:237PM | 1020903023 | Jim Irby | Reduced argon pressure to 1 psi from 1.8. No PCS changes Plasma to 1.37 s Got 1.17 MA, but only 130 kJ with 4.5 MW |
| Sep 3 2002 04:42:45:713PM | 1020903024 | Jim Irby | Changed RXU from -.02 to -.03 to increase upper triangularity fizzle jump in Br0 and Bz0 possibly from distruption |
| Sep 3 2002 04:54:20:683PM | 1020903025 | Jim Irby | Br0 offset from 0.0015 to 0.00125 fizzle! |
| Sep 4 2002 08:57:44:803AM | 1020903026 | Jim Irby | Nice Plasma, but ended in 1 MA disruption 120 kJ, 4.3 MW |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 10:03:06:750AM | Plasma | Ok | |
| 2 | 10:16:35:740AM | Plasma | Ok | |
| 3 | 10:32:54:090AM | Plasma | Ok | |
| 4 | 10:50:02:400AM | Plasma | Ok | |
| 5 | 11:08:48:007AM | Plasma | Ok | |
| 6 | 11:30:28:320AM | Plasma | Ok | |
| 7 | 11:43:26:280AM | Plasma | Ok | |
| 8 | 12:01:50:103PM | Plasma | Ok | |
| 9 | 12:15:29:567PM | Plasma | Ok | |
| 10 | 12:30:07:090PM | Plasma | Ok | |
| 11 | 12:45:13:863PM | Plasma | Ok | |
| 12 | 01:01:43:483PM | Plasma | Ok | |
| 13 | 01:29:30:773PM | Plasma | Ok | |
| 14 | 02:05:07:000PM | Plasma | Bad | EF1U @ EF1L failed to charge |
| 15 | 02:15:34:720PM | Plasma | Ok | |
| 16 | 02:28:48:240PM | Plasma | Bad | EF1L failed to charge |
| 17 | 02:39:00:837PM | Plasma | Ok | |
| 18 | 02:57:35:003PM | Plasma | Ok | |
| 19 | 03:10:29:587PM | Plasma | Ok | |
| 20 | 03:23:28:170PM | Plasma | Ok | |
| 21 | 03:40:53:790PM | Plasma | Ok | |
| 22 | 03:59:43:583PM | Plasma | Ok | |
| 23 | 04:12:55:150PM | Plasma | Ok | |
| 24 | 04:33:39:857PM | Plasma | Ok | |
| 25 | 04:46:42:390PM | Plasma | Ok | |
| 26 | 04:59:47:067PM | Plasma | Ok | |