Miniproposals

Miniproposal: 167 Date Filed: 7/23/1996 Title: Impurity Screening: Divertor Compression and the Role of First Author: Bruce Lipschultz Session Leader: Bruce Lipschultz (shots 1-31)

Engineering Operator Run Comment

mp 167

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:17:443PM

Author: To Be Determined

run 971210 session leader: Bruce Lipschultz physop: Joe Snipes engineering op: Vinnie Bertolino Mini-proposal 167: Impurity Screening: Divertor Compression and the Role of Core Impurity Confinement We investigated the compression of impurity gases into the divertor region today with the divertor RGA and core impurity diagnostics. We concentrated on obtaining data with ohmic plasmas. We accomplished about 1/2 of the ohmic program due to difficulties obtaining high density long-pulse plasmas. The obtained data with Ar at 3 different densities (nl04 = 1,1.4 & 1.8e20 corr. to nebar approx. 1.6, 2.4 and 3e20). With Kr we covered the lower 2 densities. We cannot report an analysis of the effect of impurity mass on scaling at this time. That will have to await MIST analysis and further calibration of the RGA with Kr. The Kr was successful in that we had good signals on both the divertor RGA and the McPherson spectrometer. The spectrometer was set to view Mg and Na-like Kr (Kr 24+ and 25+) that are at around 500 eV in the plasma. We were not successful in finding an appropriate line for B-like Kr (higher Te). The HIREX system failed to find a bright line for monitoring the Kr. We managed to get detachment with the 1MA plasmas (e.g. shot 15) at nl04=1.6e20. These high density shots invariably disrupted leading to at least one fizzle for the following shot. The details follow: shot #1: shot kind of strange. We got 1 MA but there was a problem with the magnetics and we don't know what the equilibrium was. Also, for some reason the RF was on. shot #2: Magnetics back. Shot flattop to 1.2 seconds. nl04 = 1.4e20. Good Ar data. Next shot lengthen to 1.5 sec current flattop and nl04=1.0e20. shot #3: disruption at 0.55 seconds shot #4: disruption at .47 seconds. shot #5: disruption at 0.82 seconds. Huge MARFE/radiated power (2MW) at around 0.45 seconds which almost kills the plasma. shot #6: finally a full length shot. Ar off this shot for a background. x-point still pretty high. Disruption during rampdown at 1.7 seconds, 700 kA. nl04=1.e20. shot #7: Ar back on and shot lasts till 1.8 seconds as in shot 6. nl04=1.0e20. shot #8: no Ar but disrupted. nl04 ~ 1.3e20. burping probe and shit-shooter (niobium) on this shot. shot #9: good shot, disrupted during rampdown at 1.7 seconds. Another background shot. FSP scan without burping. shit-shooter (niobium) at .65 sec leading to 1.5 MW radiated power! nl04=1.3e20. shot #10: disrupted at 0.45 sec. shot #11: full flattop with Ar. Disrupts at 1.58 seconds. No shit-shooter. nl04=1.5e20. shot #12: power supply problem shot #13: fizzle shot #14: fizzle shot #15: disrupted at 1.33 seconds but got a good background shot. Definite detachment at 1.05 seconds! nl04=1.6e20. shot #16: fizzle shot #17: Ar puffed but disrupted early. Shit-shooter injection at .65 seconds. shot #18: test shot #19: TF problem shot #20: Ar injected but disruption at 1.05 seconds. Starting to detach. nl04 approx. 1.6e20. shot #21: fizzle shot #22: power supply problem shot #23: shot makes it with Ar till 1.35 seconds. In and out of detachment. nl04 approx. 1.8e20. shot #24: fizzle shot #25: fizzle shot #26: background shot. Makes it almost to 1.4 seconds. nl04=1.e20. shot #27: Got Kr in! Shot lasted to inversion (1.55 seconds). Small amount of RF power (1.0 MW) in D/E combination at 0.5-0.7 seconds. nl04=1.e20. shot #28: fizzle shot #29: Kr in for nl04=1.3e20. Shot lasts to 1.55 seconds. John reports an increase of a factor of 4 in Kr levels in the divertor over the lower density. Jim also reports an increase for the core. Perhaps the valve opened for longer rather than a change in compression. shot #30: fizzle shot #31: attempt at calibration of RGA. The puff appears too small for a good calibration. In addition we find that ethylene was puffed as well by accident through the NINJA system.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:58:130PM

Author: To Be Determined

MP 167 Impurity Screening and Divertor Compression Session Leader: Bruce Lipschultz Physics Operator: Joseph Snipes We will be using the divertor RGA and core spectroscopy to determine the compression of impurities into the divertor relative to the core. The shit-shooter will be used to monitor core impurity transport. All of this information can also be used to determine the enrichment of the impurity gas compared to D2. A byproduct of this work is to extend the screening studies we have made previously to krypton. The shots today will be primarily ohmic. If we finish the ohmic agenda we will move on the RF-heated plasmas. During the ohmic shots the RF will NOT be on except for perhaps 100 msec at the beginning of the current flattop. The basic plasma characteristics will be 1 MA and varying density (from shot to shot). 1) Plasma setup and Ar injection We will start up at nl04=1.0 and make sure all the diagnostics (RGA and HIREX) are getting the proper data using Ar as the test gas. Then increase the density to nl04=1.4 and 1.8e20. This should allow us to cross the threshold into detached plasmas and determine the effect of detachment on compression/enrichment. We will also investigate Ne and Kr. The initial setup for valves and pressures will be B-bottom lower - Ar at 4 PSI. Injection time 0.3 sec for 20 msec. J-bottom - Program a 200msec pulse of vacuum at 1.5sec (eventually this will be filled with Ne at 4 PSI. Injection time 0.3 sec for 50 msec). -------------------------------------------------------------------------------- 971210001 SNIPES PHYSICS_OPERATOR 10-DEC-1997 08:41:45.64 . . . . . . . . . . . . . . . . . . . . Shot 1: Copied shot 971209025 except reset the density feedback to remain on throughout the shot and copied the gas pre-programming from shot 971209015 before the density feedback had been turned off. -------------------------------------------------------------------------------- 971210001 SNIPES PHYSICS_OPERATOR 10-DEC-1997 09:31:39.87 . . . . . . . . . . . . . . . . . . . . Shot 1: Got plasma, but main magnetics timing was screwed up. May be due to weighing down of the clock by teeing off for fluctuation signals changed by me last night. Disconnected clock to slow fluctuation signals for shot 2 to see if that fixes the main magnetics timing problem. -------------------------------------------------------------------------------- 971210001 SNIPES PHYSICS_OPERATOR 10-DEC-1997 09:34:32.11 . . . . . . . . . . . . . . . . . . . . Shot 1: RF was left on as well with 1 MW. Turned off for shot 2. -------------------------------------------------------------------------------- 971210002 SNIPES PHYSICS_OPERATOR 10-DEC-1997 09:43:56.79 . . . . . . . . . . . . . . . . . . . . Shot 2: Magnetics clock now O.K. Hard x rays early. -------------------------------------------------------------------------------- 971210003 SNIPES PHYSICS_OPERATOR 10-DEC-1997 10:03:25.32 . . . . . . . . . . . . . . . . . . . . Shot 4: Reduced nl04 to 1 x 10^20 m^-2. Increased pulse length to 1.5 sec. Lowered ZXL by 5 mm, lowered ZCUR by 5 mm as well. Reduced CLEARIN to -0.01 m from -0.008 m. Still disrupted early at 0.47 sec. -------------------------------------------------------------------------------- 971210005 SNIPES PHYSICS_OPERATOR 10-DEC-1997 10:37:33.47 . . . . . . . . . . . . . . . . . . . . Shot 5: Reduced RCUR by 1 mm to 0.664 m. Disrupted at 0.8 sec. -------------------------------------------------------------------------------- 971210006 SNIPES PHYSICS_OPERATOR 10-DEC-1997 10:51:22.52 . . . . . . . . . . . . . . . . . . . . Shot 6: Reduced ZCUR by 2 mm to -0.018 m. Better. Disrupted in rampdown at 1.7 sec. -------------------------------------------------------------------------------- 971210007 SNIPES PHYSICS_OPERATOR 10-DEC-1997 11:11:52.16 . . . . . . . . . . . . . . . . . . . . Shot 7: Re-enabled Ar puff but reduced it from 28 msec to 25 msec duration. Tweaked CLEARIN and ZCUR in rampdown to try to improve the rampdown. Good shot. Still disrupted in rampdown at 1.67 sec. -------------------------------------------------------------------------------- 971210008 SNIPES PHYSICS_OPERATOR 10-DEC-1997 11:24:07.16 . . . . . . . . . . . . . . . . . . . . Shot 8: Increased nl04 to 1.4 x 10^20 m^-2. Turned off Ar puff. Lowered ZXL by 5 mm to -0.021 m. Disrupted at 0.85 sec. Vertically unstable. -------------------------------------------------------------------------------- 971210009 SNIPES PHYSICS_OPERATOR 10-DEC-1997 11:36:10.86 . . . . . . . . . . . . . . . . . . . . Shot 9: Lowered ZCUR by 3 mm to -0.021 m. Returned ZXL up by 2mm to -0.019 m. Good shot. Disrupted in rampdown at 1.61 sec. -------------------------------------------------------------------------------- 971210010 SNIPES PHYSICS_OPERATOR 10-DEC-1997 11:49:59.25 . . . . . . . . . . . . . . . . . . . . Shot 10: Programmed J bottom gas valve for 200 msec pulse from 1.5 to 1.52 sec. Argon enabled for next shot. Tweaked RCUR in rampdown to try to improve the rampdown. Disrupted early at 0.45 sec at crossover of OH. -------------------------------------------------------------------------------- 971210011 SNIPES PHYSICS_OPERATOR 10-DEC-1997 12:12:53.18 . . . . . . . . . . . . . . . . . . . . Shot 11: Decreased pre-programmed gas and density feedback request near cross-over by about 1 x 10^19 m^-2. Good shot. Density rising too much late. Disrupted at 1.58 sec. -------------------------------------------------------------------------------- 971210012 SNIPES PHYSICS_OPERATOR 10-DEC-1997 12:29:59.48 . . . . . . . . . . . . . . . . . . . . Shot 12: Disabled Ar puff. Increased density in flattop to 1.8 x 10^20 m^-2. Moved J bottom gas programming to 1.3 sec for 200 msec. Moved Ip gain jump from 0.41 sec to 0.46 sec to see if that improves crossover. No power supplies. -------------------------------------------------------------------------------- 971210013 SNIPES PHYSICS_OPERATOR 10-DEC-1997 12:30:53.52 . . . . . . . . . . . . . . . . . . . . Shot 13: Repeat. Fizzle! -------------------------------------------------------------------------------- 971210014 SNIPES PHYSICS_OPERATOR 10-DEC-1997 12:43:36.80 . . . . . . . . . . . . . . . . . . . . Shot 14: Changed early ZXL evolution through crossover to try to avoid moving the strike point down into the divertor throat. Reduced EF4 current by 15 A to -1350 A. Fizzle! -------------------------------------------------------------------------------- 971210015 SNIPES PHYSICS_OPERATOR 10-DEC-1997 13:05:53.16 . . . . . . . . . . . . . . . . . . . . Shot 15: Reduced EF4 current by another 20 A to -1370 A early. Good shot. Disrupted at 1.3 sec. Density went higher than requested, up to 2 x 10^20 m^-2. -------------------------------------------------------------------------------- 971210016 SNIPES PHYSICS_OPERATOR 10-DEC-1997 13:19:32.67 . . . . . . . . . . . . . . . . . . . . Shot 16: Enabled Argon puff. Set pre-programmed density to go off after 1 sec. Moved J bottom gas valve programming to 0.5 sec. Ramped ZXL from 0.8 sec to 1.5 sec from -0.019 m to -0.025 m. Fizzle! -------------------------------------------------------------------------------- 971210017 SNIPES PHYSICS_OPERATOR 10-DEC-1997 13:34:24.25 . . . . . . . . . . . . . . . . . . . . Shot 17: Decreased Br by 1 mT to 5 mT. Hard x rays early. Disrupted at 0.83 sec. -------------------------------------------------------------------------------- 971210018 SNIPES PHYSICS_OPERATOR 10-DEC-1997 14:06:09.46 . . . . . . . . . . . . . . . . . . . . Shot 18: Ian suggests dropping OH2 voltage by 20 V between 5 and 15 msec. Also increased pre-puff to 23 msec duration to try to avoid the hard x rays. Alternator did not reach speed before the shot. It started slowing down. There will be a short delay. Test shot. No currents. O.K. -------------------------------------------------------------------------------- 971210019 SNIPES PHYSICS_OPERATOR 10-DEC-1997 14:14:05.45 . . . . . . . . . . . . . . . . . . . . Shot 19: Try again with plasma. IGOR problem. No TF. -------------------------------------------------------------------------------- 971210020 SNIPES PHYSICS_OPERATOR 10-DEC-1997 14:30:16.30 . . . . . . . . . . . . . . . . . . . . Shot 20: Try again with plasma. Hard x rays again. Disrupted at 1.03 sec. -------------------------------------------------------------------------------- 971210021 SNIPES PHYSICS_OPERATOR 10-DEC-1997 14:43:21.57 . . . . . . . . . . . . . . . . . . . . Shot 21: Increased gas voltage programming from t=0 by 6 V. Raised nl04 gain at 0.6 sec to 6 from 4. Ramped ZCUR down from 0.8 to 1.5 sec from -0.021 m to -0.027 m. Fizzle! -------------------------------------------------------------------------------- 971210022 SNIPES PHYSICS_OPERATOR 10-DEC-1997 14:59:27.87 . . . . . . . . . . . . . . . . . . . . Shot 22: Lowered gas voltage programming back to previous value of 76 V between 0 and 50 msec. More IGOR delays. Breakers pulled in CHECK. Start again. -------------------------------------------------------------------------------- 971210022 SNIPES PHYSICS_OPERATOR 10-DEC-1997 15:05:21.93 . . . . . . . . . . . . . . . . . . . . Shot 22: No TF. -------------------------------------------------------------------------------- 971210023 SNIPES PHYSICS_OPERATOR 10-DEC-1997 15:25:49.25 . . . . . . . . . . . . . . . . . . . . Shot 23: O.K. shot. Disrupted at 1.29 sec. Vertically unstable. -------------------------------------------------------------------------------- 971210024 SNIPES PHYSICS_OPERATOR 10-DEC-1997 15:32:26.57 . . . . . . . . . . . . . . . . . . . . Shot 24: Copied Ar puff waveform into J bottom programming. Kr put on J bottom. J bottom disabled. Ar disabled. Reduce density to 1 x 10^20 m^-2. Increased ZCUR ramp downward from 0.8 to 1.5 sec from -0.021 m to -0.031 m. Fizzle! -------------------------------------------------------------------------------- 971210025 SNIPES PHYSICS_OPERATOR 10-DEC-1997 15:50:35.65 . . . . . . . . . . . . . . . . . . . . Shot 25: Lowered EF4 current to -1340 A. Fizzle! -------------------------------------------------------------------------------- 971210026 SNIPES PHYSICS_OPERATOR 10-DEC-1997 15:57:33.65 . . . . . . . . . . . . . . . . . . . . Shot 26: Returned EF4 to -1370 A, changed Br offset to 5.5 mT. Vertically unstable. Disrupted at 1.3 sec. -------------------------------------------------------------------------------- 971210027 SNIPES PHYSICS_OPERATOR 10-DEC-1997 16:20:09.83 . . . . . . . . . . . . . . . . . . . . Shot 27: Enabled Kr gas valve. Lowered ZCUR by another 3 mm to try to prevent the vertical instability. Disrupted at 1.56 sec. 1 MW of RF from 0.5 to 0.7 sec. -------------------------------------------------------------------------------- 971210028 SNIPES PHYSICS_OPERATOR 10-DEC-1997 16:41:12.14 . . . . . . . . . . . . . . . . . . . . Shot 28: Lowered ZCUR by another 3 mm. Starts at -0.027 m to -0.037 m. Density raised to 1.4 x 10^20 m^-2. Kr still enabled. Fizzle. -------------------------------------------------------------------------------- 971210029 SNIPES PHYSICS_OPERATOR 10-DEC-1997 16:45:46.93 . . . . . . . . . . . . . . . . . . . . Shot 29: Repeat. Good shot. Disrupted at 1.55 sec. -------------------------------------------------------------------------------- 971210030 SNIPES PHYSICS_OPERATOR 10-DEC-1997 17:00:02.11 . . . . . . . . . . . . . . . . . . . . Shot 30: Raised nl04 to 1.9 x 10^20 m^-2. Increased EF3 voltage between 10 and 12 msec to 2600 V to increase the rate of rise of Bz at breakdown. Fizzle! -------------------------------------------------------------------------------- 971210031 SNIPES PHYSICS_OPERATOR 10-DEC-1997 17:01:37.84 . . . . . . . . . . . . . . . . . . . . Shot 31: J bottom gas puff only. No currents. --------------------------------------------------------------------------------

Session Leader Comments
Dec 10 1997 08:30:09:990AM		Bruce Lipschultz	run 971210 session leader: Bruce Lipschultz physop: Joe Snipes engineering op: Vinnie Bertolino Mini-proposal 167: Impurity Screening: Divertor Compression and the Role of Core Impurity Confinement We will be using the divertor RGA and core spectroscopy to determine the compression of impurities into the divertor relative to the core. The shit-shooter will be used to monitor core impurity transport. All of this information can also be used to determine the enrichment of the impurity gas compared to D2. A byproduct of this work is to extend the screening studies we have made previously to krypton. The shots today will be primarily ohmic. If we finish the ohmic agenda we will move on the RF-heated plasmas. During the ohmic shots the RF will NOT be on except for perhaps 100 msec at the beginning of the current flattop. The basic plasma characteristics will be 1 MA and varying density (from shot to shot). 1) Plasma setup and Ar injection We will start up at nl04=1.0 and make sure all the diagnostics (RGA and HIREX) are getting the proper data using Ar as the test gas. Then increase the density to nl04=1.4 and 1.8e20. This should allow us to cross the threshold into detached plasmas and determine the effect of detachment on compression/enrichment. We will also investigate Ne and Kr. The initial setup for valves and pressures will be B-bottom lower - Ar at 4 PSI. Injection time 0.3 sec for 20 msec. J-bottom - Program a 200msec pulse of vacuum at
Dec 10 1997 09:34:37:760AM	971210001	Bruce Lipschultz	shot #1: shot kind of strange. We got 1 MA but there was a problem with the magnetics and we don't know what the equilibrium was. Also, for some reason the RF was on.
Dec 10 1997 09:41:51:460AM	971210002	Bruce Lipschultz	shot #2: Magnetics back. Shot flattop to 1.2 seconds. nl04 = 1.4e20. Good Ar data. Next shot lengthen to 1.5 sec current flattop and nl04=1.0e20.
Dec 10 1997 09:54:32:950AM	971210003	Bruce Lipschultz	shot #3: disruption at 0.55 seconds
Dec 10 1997 10:03:51:090AM	971210004	Bruce Lipschultz	shot #4: disruption at .47 seconds.
Dec 10 1997 10:32:29:540AM	971210005	Bruce Lipschultz	shot #5: disruption at 0.82 seconds. Huge MARFE/radiated power (2MW) at around 0.45 seconds which almost kills the plasma.
Dec 10 1997 11:01:53:840AM	971210006	Bruce Lipschultz	shot #6: finally a full length shot. Ar off this shot for a background. x-point still pretty high. Disruption during rampdown at 1.7 seconds, 700 kA.
Dec 10 1997 11:16:15:930AM	971210007	Bruce Lipschultz	shot #7: Ar back on and shot lasts till 1.8 seconds as in shot 6. nl04=1.0e20.
Dec 10 1997 11:36:53:310AM	971210008	Bruce Lipschultz	shot #8: no Ar but disrupted. nl04 ~ 1.3e20. burping probe and shit-shooter (niobium) on this shot.
Dec 10 1997 11:42:19:640AM	971210009	Bruce Lipschultz	shot #9: good shot, disrupted during rampdown at 1.7 seconds. Another background shot. FSP scan without burping. shit-shooter (niobium) at .65 sec.
Dec 10 1997 12:00:19:310PM	971210010	Bruce Lipschultz	shot #10: disrupted at 0.45 sec.
Dec 10 1997 12:13:31:890PM	971210011	Bruce Lipschultz	shot #11: full flattop with Ar. Disrupts at 1.58 seconds. No shit-shooter.
Dec 10 1997 12:30:31:800PM	971210012	Bruce Lipschultz	shot #12: power supply problem
Dec 10 1997 12:31:03:570PM	971210012	Bruce Lipschultz	shot #13: fizzle
Dec 10 1997 12:58:17:090PM	971210014	Bruce Lipschultz	shot #14: fizzle
Dec 10 1997 01:07:56:010PM	971210015	Bruce Lipschultz	shot #15: disrupted at 1.33 seconds but got a good background shot. Definite detachment!
Dec 10 1997 01:20:30:380PM	971210016	Bruce Lipschultz	shot #16: fizzle
Dec 10 1997 01:37:25:310PM	971210017	Bruce Lipschultz	shot #17: Ar puffed but disrupted early. Shit-shooter injection at .65 seconds.
Dec 10 1997 02:39:54:870PM	971210020	Bruce Lipschultz	shot #20: Ar injected but disruption at 1.05 seconds.
Dec 10 1997 02:52:16:460PM	971210021	Bruce Lipschultz	shot #21: fizzle
Dec 10 1997 03:20:12:060PM	971210022	Bruce Lipschultz	shot #22: power supply problem
Dec 10 1997 03:39:06:200PM	971210023	Bruce Lipschultz	shot #23: shot makes it with Ar till 1.35 seconds.
Dec 10 1997 03:39:26:610PM	971210024	Bruce Lipschultz	shot #24: fizzle
Dec 10 1997 03:40:36:180PM	971210025	Bruce Lipschultz	shot #25: fizzle
Dec 10 1997 04:27:40:440PM	971210027	Bruce Lipschultz	shot #27: Got Kr in! Shot lasted to inversion (1.55 seconds). Small amount of RF power (1.0 MW) in D/E combination at 0.5-0.7 seconds. nl04=1.e20.
Dec 10 1997 04:37:09:040PM	971210028	Bruce Lipschultz	shot #28: fizzle
Dec 10 1997 04:51:05:000PM	971210029	Bruce Lipschultz	shot #29: Kr in for nl04=1.3e20. Shot lasts to 1.55 seconds. John reports an increase of a factor of 4 in Kr levels in the divertor over the lower density.
Dec 10 1997 05:29:12:240PM	971210031	Bruce Lipschultz	shot #31: attempt at calibration of RGA. The puff appears too small for a good calibration. In addition we find that ethylene was puffed as well by accident through the NINJA system.

Physics Operator Comments
Dec 10 1997 08:31:57:130AM		Joseph Snipes	MP 167 Impurity Screening and Divertor Compression Session Leader: Bruce Lipschultz Physics Operator: Joseph Snipes We will be using the divertor RGA and core spectroscopy to determine the compression of impurities into the divertor relative to the core. The shit-shooter will be used to monitor core impurity transport. All of this information can also be used to determine the enrichment of the impurity gas compared to D2. A byproduct of this work is to extend the screening studies we have made previously to krypton. The shots today will be primarily ohmic. If we finish the ohmic agenda we will move on the RF-heated plasmas. During the ohmic shots the RF will NOT be on except for perhaps 100 msec at the beginning of the current flattop. The basic plasma characteristics will be 1 MA and varying density (from shot to shot). 1) Plasma setup and Ar injection We will start up at nl04=1.0 and make sure all the diagnostics (RGA and HIREX) are getting the proper data using Ar as the test gas. Then increase the density to nl04=1.4 and 1.8e20. This should allow us to cross the threshold into detached plasmas and determine the effect of detachment on compression/enrichment. We will also investigate Ne and Kr. The initial setup for valves and pressures will be B-bottom lower - Ar at 4 PSI. Injection time 0.3 sec for 20 msec. J-bottom - Program a 200msec pulse of vacuum at 1.5sec (eventually this will be filled with Ne at 4 PSI. Injection time 0.3 sec fo
Dec 10 1997 08:41:45:640AM	971210001	Joseph Snipes	Shot 1: Copied shot 971209025 except reset the density feedback to remain on throughout the shot and copied the gas pre-programming from shot 971209015 before the density feedback had been turned off.
Dec 10 1997 09:31:39:870AM	971210001	Joseph Snipes	Shot 1: Got plasma, but main magnetics timing was screwed up. May be due to weighing down of the clock by teeing off for fluctuation signals changed by me last night. Disconnected clock to slow fluctuation signals for shot 2 to see if that fixes the main magnetics timing problem.
Dec 10 1997 09:34:32:110AM	971210001	Joseph Snipes	Shot 1: RF was left on as well with 1 MW. Turned off for shot 2.
Dec 10 1997 09:43:56:790AM	971210002	Joseph Snipes	Shot 2: Magnetics clock now O.K. Hard x rays early.
Dec 10 1997 10:03:25:320AM	971210003	Joseph Snipes	Shot 4: Reduced nl04 to 1 x 10^20 m^-2. Increased pulse length to 1.5 sec. Lowered ZXL by 5 mm, lowered ZCUR by 5 mm as well. Reduced CLEARIN to -0.01 m from -0.008 m. Still disrupted early at 0.47 sec.
Dec 10 1997 10:37:33:470AM	971210005	Joseph Snipes	Shot 5: Reduced RCUR by 1 mm to 0.664 m. Disrupted at 0.8 sec.
Dec 10 1997 10:51:22:520AM	971210006	Joseph Snipes	Shot 6: Reduced ZCUR by 2 mm to -0.018 m. Better. Disrupted in rampdown at 1.7 sec.
Dec 10 1997 11:11:52:160AM	971210007	Joseph Snipes	Shot 7: Re-enabled Ar puff but reduced it from 28 msec to 25 msec duration. Tweaked CLEARIN and ZCUR in rampdown to try to improve the rampdown. Good shot. Still disrupted in rampdown at 1.67 sec.
Dec 10 1997 11:24:07:160AM	971210008	Joseph Snipes	Shot 8: Increased nl04 to 1.4 x 10^20 m^-2. Turned off Ar puff. Lowered ZXL by 5 mm to -0.021 m. Disrupted at 0.85 sec. Vertically unstable.
Dec 10 1997 11:35:56:210AM	971210008	Joseph Snipes	Shot 9: Lowered ZCUR by 3 mm to -0.021 m. Returned ZXL up by 2mm to -0.019 m. Good shot. Disrupted in rampdown at 1.61 sec.
Dec 10 1997 11:36:10:860AM	971210009	Joseph Snipes	Shot 9: Lowered ZCUR by 3 mm to -0.021 m. Returned ZXL up by 2mm to -0.019 m. Good shot. Disrupted in rampdown at 1.61 sec.
Dec 10 1997 11:49:59:250AM	971210010	Joseph Snipes	Shot 10: Programmed J bottom gas valve for 200 msec pulse from 1.5 to 1.52 sec. Argon enabled for next shot. Tweaked RCUR in rampdown to try to improve the rampdown. Disrupted early at 0.45 sec at crossover of OH.
Dec 10 1997 12:12:53:180PM	971210011	Joseph Snipes	Shot 11: Decreased pre-programmed gas and density feedback request near cross-over by about 1 x 10^19 m^-2. Good shot. Density rising too much late. Disrupted at 1.58 sec.
Dec 10 1997 12:29:59:480PM	971210012	Joseph Snipes	Shot 12: Disabled Ar puff. Increased density in flattop to 1.8 x 10^20 m^-2. Moved J bottom gas programming to 1.3 sec for 200 msec. Moved Ip gain jump from 0.41 sec to 0.46 sec to see if that improves crossover. No power supplies.
Dec 10 1997 12:30:53:520PM	971210013	Joseph Snipes	Shot 13: Repeat. Fizzle!
Dec 10 1997 12:43:36:800PM	971210014	Joseph Snipes	Shot 14: Changed early ZXL evolution through crossover to try to avoid moving the strike point down into the divertor throat. Reduced EF4 current by 15 A to -1350 A. Fizzle!
Dec 10 1997 01:05:53:160PM	971210015	Joseph Snipes	Shot 15: Reduced EF4 current by another 20 A to -1370 A early. Good shot. Disrupted at 1.3 sec. Density went higher than requested, up to 2 x 10^20 m^-2.
Dec 10 1997 01:19:32:670PM	971210016	Joseph Snipes	Shot 16: Enabled Argon puff. Set pre-programmed density to go off after 1 sec. Moved J bottom gas valve programming to 0.5 sec. Ramped ZXL from 0.8 sec to 1.5 sec from -0.019 m to -0.025 m. Fizzle!
Dec 10 1997 01:34:24:250PM	971210017	Joseph Snipes	Shot 17: Decreased Br by 1 mT to 5 mT. Hard x rays early. Disrupted at 0.83 sec.
Dec 10 1997 01:44:52:340PM	971210018	Joseph Snipes	Shot 18: Ian suggests dropping OH2 voltage by 20 V between 5 and 15 msec. Also increased pre-puff to 23 msec duration to try to avoid the hard x rays. Alternator did not reach speed before the shot. It started slowing down. There will be a short delay.
Dec 10 1997 02:06:09:460PM	971210018	Joseph Snipes	Shot 18: Ian suggests dropping OH2 voltage by 20 V between 5 and 15 msec. Also increased pre-puff to 23 msec duration to try to avoid the hard x rays. Alternator did not reach speed before the shot. It started slowing down. There will be a short delay. Test shot. No currents. O.K.
Dec 10 1997 02:14:05:450PM	971210019	Joseph Snipes	Shot 19: Try again with plasma. IGOR problem. No TF.
Dec 10 1997 02:30:16:300PM	971210020	Joseph Snipes	Shot 20: Try again with plasma. Hard x rays again. Disrupted at 1.03 sec.
Dec 10 1997 02:43:21:570PM	971210021	Joseph Snipes	Shot 21: Increased gas voltage programming from t=0 by 6 V. Raised nl04 gain at 0.6 sec to 6 from 4. Ramped ZCUR down from 0.8 to 1.5 sec from -0.021 m to -0.027 m. Fizzle!
Dec 10 1997 02:59:27:870PM	971210022	Joseph Snipes	Shot 22: Lowered gas voltage programming back to previous value of 76 V between 0 and 50 msec. More IGOR delays. Breakers pulled in CHECK. Start again.
Dec 10 1997 03:05:21:930PM	971210022	Joseph Snipes	Shot 22: No TF.
Dec 10 1997 03:25:49:250PM	971210023	Joseph Snipes	Shot 23: O.K. shot. Disrupted at 1.29 sec. Vertically unstable.
Dec 10 1997 03:32:26:570PM	971210024	Joseph Snipes	Shot 24: Copied Ar puff waveform into J bottom programming. Kr put on J bottom. J bottom disabled. Ar disabled. Reduce density to 1 x 10^20 m^-2. Increased ZCUR ramp downward from 0.8 to 1.5 sec from -0.021 m to -0.031 m. Fizzle!
Dec 10 1997 03:50:35:650PM	971210025	Joseph Snipes	Shot 25: Lowered EF4 current to -1340 A. Fizzle!
Dec 10 1997 03:57:33:650PM	971210026	Joseph Snipes	Shot 26: Returned EF4 to -1370 A, changed Br offset to 5.5 mT. Vertically unstable. Disrupted at 1.3 sec.
Dec 10 1997 04:19:40:590PM	971210027	Joseph Snipes	Shot 27: Enabled Kr gas valve. Lowered ZCUR by another 3 mm to try to prevent the vertical instability. Disrupted at 1.56 sec.
Dec 10 1997 04:20:09:830PM	971210027	Joseph Snipes	Shot 27: Enabled Kr gas valve. Lowered ZCUR by another 3 mm to try to prevent the vertical instability. Disrupted at 1.56 sec. 1 MW of RF from 0.5 to 0.7 sec.
Dec 10 1997 04:41:12:140PM	971210028	Joseph Snipes	Shot 28: Lowered ZCUR by another 3 mm. Starts at -0.027 m to -0.037 m. Density raised to 1.4 x 10^20 m^-2. Kr still enabled. Fizzle.
Dec 10 1997 04:45:46:930PM	971210029	Joseph Snipes	Shot 29: Repeat. Good shot. Disrupted at 1.55 sec.
Dec 10 1997 05:00:02:110PM	971210030	Joseph Snipes	Shot 30: Raised nl04 to 1.9 x 10^20 m^-2. Increased EF3 voltage between 10 and 12 msec to 2600 V to increase the rate of rise of Bz at breakdown. Fizzle!
Dec 10 1997 05:01:37:840PM	971210031	Joseph Snipes	Shot 31: J bottom gas puff only. No currents.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:05:37:020AM	Plasma	Ok
2	09:32:45:680AM	Plasma	Ok
3	09:45:18:340AM	Plasma	Ok
4	10:00:47:590AM	Plasma	Ok
5	10:22:24:750AM	Plasma	Ok
6	10:42:40:340AM	Plasma	Ok
7	10:58:49:790AM	Plasma	Ok
8	11:15:59:610AM	Plasma	Ok
9	11:32:47:180AM	Plasma	Ok
10	11:46:51:480AM	Plasma	Ok	oh1 self powered ckt fired
11	12:00:30:230PM	Plasma	Ok
12	12:14:25:180PM	Plasma	Bad	mag resist fault
13	12:29:02:740PM	Plasma	Ok
14	12:40:07:550PM	Plasma	Ok
15	12:52:27:120PM	Plasma	Ok
16	01:13:05:350PM	Plasma	Ok
17	01:21:49:140PM	Plasma	Ok
18	01:36:43:980PM	Test	Ok
19	02:08:16:400PM	Plasma	Ok
20	02:19:22:580PM	Plasma	Ok
21	02:40:41:610PM	Plasma	Ok
22	02:53:21:540PM	Plasma	Ok
23	03:10:13:760PM	Plasma	Ok
24	03:30:42:860PM	Plasma	Ok	fizzel
25	03:39:08:820PM	Plasma	Ok
26	03:52:33:460PM	Plasma	Ok	no faults
27	04:07:54:250PM	Plasma	Ok	no faults
28	04:31:24:110PM	Plasma	Ok	no faults
29	04:40:14:580PM	Plasma	Ok	no faults
30	04:53:14:510PM	Plasma	Ok	fizzel
31	05:01:09:600PM	Test	Ok	gas test