| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Brian Labombard |
| Physics operator(s): | Joseph Snipes |
| Engineering operator(s): | Gary Dekow |
| Engineering Operator Run Comment |
| MP267 SOL Fluctuations SL:LaBombard PO:Snipes EO:Dekow |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:24:023PM |
| Author: To Be Determined |
| MP#267 "Dependence of SOL Fluctuations and Particle Transport on Collisionality" Session Leader - B. LaBombard Phys Op - J. Snipes ============================================================================== Run Plan for second day of MP#267 The purpose of these experiments is to explore the dependence of SOL fluctuation characteristics and attendant cross-field particle transport on the collisionality of the SOL. The key diagnostics which must be operational for this study are: (a) A-port and F-port scanning probes operated in a fluctuation mode (The A-port probe will be used in both a spatially scanning and a fixed position mode.), (b) divertor probes operated in a fluctuation mode, (c) fast visible diodes viewing helium puffed from the A/B limiter capillary, (d) tangential Ly-alpha diode array, (e) limiter particle flux probes, and (f) edge thomson scattering. Day 2: Coarse density scans at different plasma currents and toroidal fields Start with reload of shot#1000517017 which was a 0.8 MA, 5.3 tesla shot, and dial up 0.5 MA. Shot#1-3 NL04 = 0.5x10^20 m^-2 Ip = 0.53 MA, Bt = 5.3 tesla Setup equilibrium and FSP/ASP target. Take two shots at each condition to optimize scanning probe insertion depths. Shot#4,5 - NL04 = 0.5, Ip = 0.53, Bt = 5.3 6,7 - NL04 = 0.7, Ip = 0.53, Bt = 5.3 8,9 - NL04 = 0.9, Ip = 0.53, Bt = 5.3 10,11 - NL04 = 1.0, Ip = 1.06, Bt = 5.3 12,13 - NL04 = 1.3, Ip = 1.06, Bt = 5.3 14,15 - NL04 = 0.7, Ip = 1.06, Bt = 5.3 16,17 - NL04 = 0.6, Ip = 0.8, Bt = 4 18,19 - NL04 = 0.9, Ip = 0.8, Bt = 4 20,21 - NL04 = 1.2, Ip = 0.8, Bt = 4 22,23 - NL04 = 1.2, Ip = 0.8, Bt = 6 24,25 - NL04 = 0.9, Ip = 0.8, Bt = 6 26,27 - NL04 = 0.6, Ip = 0.8, Bt = 6 ============================================================================== Results: This was an excellent run day. We were able to covered all the Ip, Bt, and NL04 parameter space with at least one fairly decent discharge for each permutation. We spent 5 initial discharges trying to get the 0.53 MA conditions. Finally, with guidance from Wolfe and Marmar, we got started on a roll on shot 6. The ambitious run plan called for operating the divertor probes in an alternating 'gated' and 'continuous fluctuation' mode in identical shots. But, since this would have required more than one day to complete this, we often dropped the 'continuous fluctuation' mode data point and moved on to the next shot setup. Hopefully this decision does not bite us later on when we look at the fluctuation data in detail. Looking by eye at the wiggles and squiggles in the probe fluctuation data, it is difficult to say at this time if there are going to be any clear trends with collisionality (i.e., electron-ion mean free path normalized to the parallel magnetic connection length). However, it is clear that the fluctuation character generally changes with increasing plasma density, all else begin the same. The only thing that didn't work today was the limiter flux probe, AT, on the A-side of the A-B limiter, top location. Apparently, the probe got toasted last week, perhaps from the 1.4 MA disruption which seemed to bump the upper sections of the outboard limiters on its way to termination. Unfortunately, this one probe (out of the total of 8) is the critical one in the limiter group. It was being used to directly record the fluxes to the wall. Perhaps the GT probe, which has a longer magnetic connection length, can be used in its place. The next step in the data mining process is to write fluctuation analysis codes and to pick through the many megabytes of data. (This will surely occupy my 'free' time for quite a while!) Also, cross-field particle fluxes from the Lyman-alpha measurements and fluctuations recorded by the A/B helium puffer should be very interesting - again, more database tables to load, more code to write. Detailed Shot log: Shot 1 - disrupted at .28 sec Shot 2 - disrupted at .3 sec Shot 3 - disrupted at .27 sec Shot 4 - disrupted at .6 sec Shot 5 - .53 MA shot, scanning probes in far sol Shot 6 - .53 MA shot, NL04=0.5 Divertor probes in gated fluctuation mode ASP, FSP scanning in N/S - Vf, E/W sweep mode Scanning to separatrix Outer divertor looks like it is in a conduction-limited mode. Some probe arcing. Shot 7 - .53 MA shot, NL04=0.44 Divertor probes in gated fluctuation mode ASP, FSP scanning in N/S - Vf, E/W sweep mode Scanning to separatrix and beyond - nice data! ASP gets profile inside LCFS - the density and Vf profiles appear to flatten Shot 8 - .53 MA shot, NL04=0.68 Divertor probes in gated fluctuation mode ASP, FSP scanning in N/S - Vf, E/W sweep mode nice data, FSP could go deeper Shot 9 - .53 MA shot, NL04=0.7 Divertor probes in continuous fluctuation mode ASP, FSP scanning in N/S - Vf, E/W sweep mode nice data Shot 10 - .53 MA shot, NL04=0.9 going to 1.1 during MARFE Large MARFE in upper chamber Outer divertor - death ray and detaches at .5 sec Divertor probes in gated mode ASP, FSP scanning in N/S - Vf, E/W sweep mode nice data during first scan. Probes could go deeper Shot 11 - .53 MA shot, NL04=0.9 going to 1.1 during MARFE Large MARFE in upper chamber - very similar to shot 10 Outer divertor - death ray and detaches at .5 sec Divertor probes in continuous fluctuation mode ASP, FSP scanning in N/S - Vf, E/W sweep mode Shot 12 - 1.04 MA shot, NL04=1.0 Divertor probes in gated mode ASP, FSP scanning in N/S - Vf, E/W sweep mode Dithering mode Bt sweeps for ECE are on in this shot Shot 13 - 1.05 MA shot, NL04=0.94 Divertor probes in continuous mode ASP, FSP scanning in N/S - Vf, E/W sweep mode Shot 14 - 1.05 MA shot, NL04=1.3 Divertor probes in gated mode ASP, FSP scanning in N/S - Vf, E/W sweep mode ASP a little over-inserted. FSP data look good. Shot 15 - 1.05 MA shot, NL04=0.8 Divertor probes in gated mode ASP, FSP scanning in N/S - Vf, E/W sweep mode ASP needs to go in deeper.. FSP data look good. Shot 16 - 1.05 MA shot, NL04=0.8 Divertor probes in continuous mode ASP, FSP scanning in N/S - Vf, E/W sweep mode Shot 17 - 0.8 MA shot, Bt=4.09, NL04=0.7 Divertor probes in gated mode ASP, FSP scanning in N/S - Vf, E/W sweep mode Shot 18 - No plasma Shot 19 - 0.8 MA, Bt=4T, NL04=0.88 ASP/FSP scanning Divertor probes in gated mode. Shot 20 - 0.8 MA, Bt=4T, NL04=1.13 ASP/FSP scanning Divertor probes in gated mode. Shot 21 - 0.8 MA, Bt=5.8T, NL04=1, rising to 1.2 ASP/FSP scanning Divertor probes in gated mode. Notes: ASP reaches about the same location 3 times yet shows differences in fluctuation behavior. The G-side neutral pressure increases by 0.7 mtorr from 1st to 3rd scan -> need to consider this parameter. Shot 22 - 0.8 MA, Bt=6T, NL04=.85, rising to 0.9 ASP/FSP scanning Divertor probes in gated mode. Excellent data on ASP - seems to have less arcing at high Bt. Shot 23 - 0.8 MA, Bt=6T, NL04=.65 ASP/FSP scanning Divertor probes in gated mode. Nice data on ASP and FSP An excellent run! |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:11:067PM |
| Author: To Be Determined |
| Run Plan for second day of MP#267 "Dependence of SOL Fluctuations and Particle Transport on Collisionality" The purpose of these experiments is to explore the dependence of SOL fluctuation characteristics and attendant cross-field particle transport on the collisionality of the SOL. The key diagnostics which must be operational for this study are: (a) A-port and F-port scanning probes operated in a fluctuation mode (The A-port probe will be used in both a spatially scanning and a fixed position mode.), (b) divertor probes operated in a fluctuation mode, (c) fast visible diodes viewing helium puffed from the A/B limiter capillary, (d) tangential Ly-alpha diode array, (e) limiter particle flux probes, and (f) edge thomson scattering. Day 2: Coarse density scans at different plasma currents and toroidal fields Start with reload of shot#1000517017 which was a 0.8 MA, 5.3 tesla shot, and dial up 0.5 MA. Shot#1-3 NL04 = 0.5x10^20 m^-2 Ip = 0.53 MA, Bt = 5.3 tesla Setup equilibrium and FSP/ASP target. Take two shots at each condition to optimize scanning probe insertion depths. Shot#4,5 - NL04 = 0.5, Ip = 0.53, Bt = 5.3 6,7 - NL04 = 0.7, Ip = 0.53, Bt = 5.3 8,9 - NL04 = 0.9, Ip = 0.53, Bt = 5.3 10,11 - NL04 = 1.0, Ip = 1.06, Bt = 5.3 12,13 - NL04 = 1.3, Ip = 1.06, Bt = 5.3 14,15 - NL04 = 0.7, Ip = 1.06, Bt = 5.3 16,17 - NL04 = 0.6, Ip = 0.8, Bt = 4 18,19 - NL04 = 0.9, Ip = 0.8, Bt = 4 20,21 - NL04 = 1.2, Ip = 0.8, Bt = 4 22,23 - NL04 = 1.2, Ip = 0.8, Bt = 6 24,25 - NL04 = 0.9, Ip = 0.8, Bt = 6 26,27 - NL04 = 0.6, Ip = 0.8, Bt = 6 Engineering Setup for 1000602 2 hours of ECDC in D2 in the morning finishing 1 hour before the run. Setup from shot 1000517017. Gas setup: B-Top 6 psi D2 Hybrid Enabled B-side lower 1 psi Argon Hybrid DISABLED C-side 30 psi D2 Hybrid Enabled J-bottom leave as is Hybrid DISABLED The following Gate Valves should be ENABLED, assuming no vacuum problems: ECE, VUV, DNB Summary: The machine ran very well. We had a slow start with a series of short disruptions because of the current dependence of the gaps and hence vertical stability of the plasma. However, by following both Marmar and Wolfe's suggestions for improving the plasma, we finally got some good low current shots. From then, on the run went smoothly except for one fizzle on shot 18 due to a brief leak that opened up right before the shot due to intense cooling. Brian was pleased with the data he got with the scanning probe. So, the run was quite successful. Good work! Scorecard: 23 shots, 22 plasmas, 1 fizzle. Shot 1: Copied shot 1000517017 and reduced Ip to 0.5 MA. Disrupted at 0.28 s probably due to a brick falling in. Good current rise though! Shot 2: Repeat with hopefully better results. Nope still disrupted early. Shot 3: Reduce the rate of rise of the current and program 0.53 MA in the flattop. Still disrupted early. Shot 4: Following Earl's suggestion, I recopied shot 1000517017 and let it go up to 0.8 MA and then reduced the current after 0.35 sec to 0.53 MA by 0.5 sec then flat. Also moved feedback jump in CLEARIN from 0.5 sec to 0.65 sec and reduced CLEARIN by 3 mm. Disrupted at .6 sec. Shot 5: Reduced CLEARIN by another cm or so to -2.5 cm during the flattop with a ramp during the current ramp down to 0.53 MA. Good shot. Shot 6: Repeat. Good shot. But, the current rise does not look good. Shot 7: Reduced pre-puff by 2 ms to 18 ms. Neutral pressure was higher and the current rise hesitated more. nl04 set to 4 x 10^19 m^-2. Otherwise a good shot. Shot 8: Reduced pre-puff by another 2 ms to 16 ms duration. Increased nl04 to 7 x 10^19 m^-2. TRAQ 2 failure, so the EFIT data will be corrupted. Good shot except the current rise hesitation is still there. Shot 9: Raise pre-puff to 17 ms duration. DNB raised their pressure by 1 mTorr so that will effectively increase the pre-puff as well. Good shot. Current rise looks better. Shot 10: Increased nl04 to 9 x 10^19 m^-2. Good shot with a MARFE. Shot 11: Repeat. Good shot with a MARFE. Shot 12: Copied shot 1000601023 and raised Ip to 1.06 MA. Increased CLEARIN by 1 mm to compensate. Decreased by 2.5 mm to increase the outer gap. Good shot. Shot 13: Removed TF blips that were present in the old shot for Amanda. Increased RCUR by 1 mm to reduce the outer gap. Enabled Ar puff from 0.35 - 0.39 sec. Good shot. Shot 14: Increased nl04 to 1.3 x 10^20 m^-2. Good shot. Shot 15: Decreased nl04 to 0.6 x 10^20 m^-2. Good shot. Only got 0.8 x 10^20 m^-2 though. Shot 16: nl04 set to 7 x 10^-19 m^-2. Increased pre-puff by 2 ms to 19 ms duration. Good shot. Shot 17: Reloaded 1000517017 and changed TF current from 150 kA to 112 kA to run 4 T after 0.15 sec. Reduced pre-puff by 2 ms to 17 ms since the DNB has increased their pressure by 0.5 mTorr. Good shot. Reached 4.095 T, not quite 4 T. Shot 18: Reduced TF current to 109 kA to get 4 T. Fizzle! Irby informs me that they pushed cooling a little too hard and there was a small leak just before the shot that may have led to the fizzle. Shot 19: Raise nl04 to 9 x 10^19 m^-2. Current rise looks fine. Good shot. Shot 20: Raise nl04 to 1.2 x 10^20 m^-2. Good shot. Shot 21: Raise TF current to 163.5 kA to reach 6 T after 0.15 s, then begin its rampdown at 1.25 s. Raise TF current limit to 170 kA to provide some headroom. Good shot. TF only reached 5.8 T though. Shot 22: Raise TF current limit to 175 kA and raise TF current to 169 kA from 0.15 - 1.4 sec. Lower nl04 to 9 x 10^19 m^-2. Good shot. Shot 23: Lower nl04 to 0.6 x 10^19 m^-2. Good shot. |
| Session Leader Comments | |||
| Jun 2 2000 09:03:32:123AM | Brian Labombard | Run Plan for second day of MP#267 "Dependence of SOL Fluctuations and Particle Transport on Collisionality" The purpose of these experiments is to explore the dependence of SOL fluctuation characteristics and attendant cross-field particle transport on the collisionality of the SOL. The key diagnostics which must be operational for this study are: (a) A-port and F-port scanning probes operated in a fluctuation mode (The A-port probe will be used in both a spatially scanning and a fixed position mode.), (b) divertor probes operated in a fluctuation mode, (c) fast visible diodes viewing helium puffed from the A/B limiter capillary, (d) tangential Ly-alpha diode array, (e) limiter particle flux probes, and (f) edge thomson scattering. Day 2: Coarse density scans at different plasma currents and toroidal fields Start with reload of shot#1000517017 which was a 0.8 MA, 5.3 tesla shot, and dial up 0.5 MA. Shot#1-3 NL04 = 0.5x10^20 m^-2 Ip = 0.53 MA, Bt = 5.3 tesla Setup equilibrium and FSP/ASP target. Take two shots at each condition to optimize scanning probe insertion depths. Shot#4,5 - NL04 = 0.5, Ip = 0.53, Bt = 5.3 6,7 - NL04 = 0.7, Ip = 0.53, Bt = 5.3 8,9 - NL04 = 0.9, Ip = 0.53, Bt = 5.3 10,11 - NL04 = 1.0, Ip = 1.06, Bt = 5.3 12,13 - NL04 = 1.3, Ip = 1.06, Bt = 5.3 14,15 - NL04 = 0.7, Ip = 1.06, Bt = 5.3 16,17 - NL04 = 0.6, Ip = 0.8, Bt = 4 18,19 - NL04 = 0.9, Ip = 0.8, Bt = 4 20,21 - NL04 = 1.2, Ip = 0.8, Bt = 4 22,23 - NL04 = 1.2, Ip = 0.8, Bt = 6 24,25 - NL04 = 0.9, Ip = 0.8, Bt = 6 26,27 - NL04 = 0.6, Ip = 0.8, Bt = 6 | |
| Jun 2 2000 09:10:42:200AM | 1000602001 | Brian Labombard | Shot 1 - disrupted at .28 sec |
| Jun 2 2000 09:26:39:983AM | 1000602002 | Brian Labombard | Shot 2 - disrupted at .3 sec |
| Jun 2 2000 09:46:41:373AM | 1000602003 | Brian Labombard | Shot 3 - disrupted at .27 sec I see a pattern here |
| Jun 2 2000 10:24:28:373AM | 1000602004 | Brian Labombard | Shot 4 - disrupted at .6 sec |
| Jun 2 2000 10:33:47:250AM | 1000602005 | Brian Labombard | Shot 5 - .53 MA shot Next shot: repeat and scan probes to separatrix |
| Jun 2 2000 10:54:18:293AM | 1000602006 | Brian Labombard | Shot 6 - .53 MA shot, NL04=0.5 Divertor probes in gated fluctuation mode ASP, FSP scanning in N/S - Vf, E/W sweep mode Scanning to separatrix Outer divertor looks like it is in a conduction-limited mode. Some probe arcing. Next shot, repeat with lower density, NL04=0.4 |
| Jun 2 2000 11:14:56:577AM | 1000602007 | Brian Labombard | Shot 7 - .53 MA shot, NL04=0.44 Divertor probes in gated fluctuation mode ASP, FSP scanning in N/S - Vf, E/W sweep mode Scanning to separatrix and beyond - nice data! ASP gets profile inside LCFS - the density and Vf profiles appear to flatten Next shot, repeat with higher density, NL04=0.7 |
| Jun 2 2000 11:46:35:560AM | 1000602008 | Brian Labombard | Shot 8 - .53 MA shot, NL04=0.68 Divertor probes in gated fluctuation mode ASP, FSP scanning in N/S - Vf, E/W sweep mode nice data, FSP could go deeper Next shot, repeat with divertor probes in continuous fluctuation mode |
| Jun 2 2000 11:55:16:390AM | 1000602009 | Brian Labombard | Shot 9 - .53 MA shot, NL04=0.7 Divertor probes in continuous fluctuation mode ASP, FSP scanning in N/S - Vf, E/W sweep mode nice data Next shot, go to NL04=0.9 with gated divertor probes |
| Jun 2 2000 12:25:47:840PM | 1000602010 | Brian Labombard | Shot 10 - .53 MA shot, NL04=0.9 going to 1.1 during MARFE Large MARFE in upper chamber Outer divertor - death ray and detaches at .5 sec Divertor probes in gated mode ASP, FSP scanning in N/S - Vf, E/W sweep mode nice data during first scan. Probes could go deeper Next shot, repeat NL04=0.9 with continous fluctuation monitor on divertor probes, trig = .65 sec |
| Jun 2 2000 12:46:59:810PM | 1000602011 | Brian Labombard | Shot 11 - .53 MA shot, NL04=0.9 going to 1.1 during MARFE Large MARFE in upper chamber - very similar to shot 10 Outer divertor - death ray and detaches at .5 sec Divertor probes in continuous fluctuation mode ASP, FSP scanning in N/S - Vf, E/W sweep mode Next shot, go to 1.06MA, NL04=1.0 using reload of 1000601023 |
| Jun 2 2000 01:06:27:687PM | 1000602012 | Brian Labombard | Shot 12 - 1.04 MA shot, NL04=1.0 Divertor probes in gated mode ASP, FSP scanning in N/S - Vf, E/W sweep mode Dithering mode Bt sweeps for ECE are on in this shot Next shot, repeat with optimized probe insertion, smaller outer gap and divertor probes in continuous mode. |
| Jun 2 2000 01:16:12:357PM | 1000602013 | Brian Labombard | Shot 13 - 1.05 MA shot, NL04=0.94 Divertor probes in continuous mode ASP, FSP scanning in N/S - Vf, E/W sweep mode Next shot, goto NL04=1.3, divertor probes gated. |
| Jun 2 2000 01:35:51:983PM | 1000602014 | Brian Labombard | Shot 14 - 1.05 MA shot, NL04=1.3 Divertor probes in gated mode ASP, FSP scanning in N/S - Vf, E/W sweep mode ASP a little over-inserted. FSP data look good. Next shot, goto NL04=0.6, divertor probes gated. |
| Jun 2 2000 02:01:16:890PM | 1000602015 | Brian Labombard | Shot 15 - 1.05 MA shot, NL04=0.8 Divertor probes in gated mode ASP, FSP scanning in N/S - Vf, E/W sweep mode ASP needs to go in deeper.. FSP data look good. Next shot, repeat NL04=0.7, with divertor probes in continuous mode. |
| Jun 2 2000 02:14:01:890PM | 1000602016 | Brian Labombard | Shot 16 - 1.05 MA shot, NL04=0.8 Divertor probes in continuous mode ASP, FSP scanning in N/S - Vf, E/W sweep mode Next shot, reload 1000517017, Ip=0.8 and dial up Bt=4, NL04=0.6 |
| Jun 2 2000 02:37:05:263PM | 1000602017 | Brian Labombard | Shot 17 - 0.8 MA shot, Bt=4.09, NL04=0.7 Divertor probes in gated mode ASP, FSP scanning in N/S - Vf, E/W sweep mode Next shot repeat with divertor probes in continuous mode. |
| Jun 2 2000 02:56:40:000PM | 1000602018 | Brian Labombard | Shot 18 - No plasma Next shot: go to NL04=0.9, divertor probes in gated mode.. |
| Jun 2 2000 03:12:43:403PM | 1000602019 | Brian Labombard | Shot 19 - 0.8 MA, Bt=4T, NL04=0.88 ASP/FSP scanning Divertor probes in gated mode. Next shot: go to NL04=1.2, divertor probes in gated mode.. |
| Jun 2 2000 03:35:43:170PM | 1000602020 | Brian Labombard | Shot 20 - 0.8 MA, Bt=4T, NL04=1.13 ASP/FSP scanning Divertor probes in gated mode. Next shot: go to Bt=6T, divertor probes in gated mode.. |
| Jun 2 2000 04:10:34:060PM | 1000602021 | Brian Labombard | Shot 21 - 0.8 MA, Bt=5.8T, NL04=1, rising to 1.2 ASP/FSP scanning Divertor probes in gated mode. Notes: ASP reaches about the same location 3 times yet shows differences in fluctuation behavior. The G-side neutral pressure increases by 0.7 mtorr from 1st to 3rd scan -> need to consider this parameter. Next shot: go toNL04=0.9, divertor probes in gated mode.. |
| Jun 2 2000 04:24:27:750PM | 1000602022 | Brian Labombard | Shot 22 - 0.8 MA, Bt=6T, NL04=.85, rising to 0.9 ASP/FSP scanning Divertor probes in gated mode. Excellent data on ASP - seems to have less arcing at high Bt. Next shot: go to NL04=0.6, divertor probes in gated mode.. |
| Jun 2 2000 04:49:43:793PM | 1000602023 | Brian Labombard | Shot 23 - 0.8 MA, Bt=6T, NL04=.65 ASP/FSP scanning Divertor probes in gated mode. Nice data on ASP and FSP An excellent run! |
| Physics Operator Comments | |||
| Jun 2 2000 09:00:43:793AM | 1000602001 | Joseph Snipes | Run Plan for second day of MP#267 "Dependence of SOL Fluctuations and Particle Transport on Collisionality" The purpose of these experiments is to explore the dependence of SOL fluctuation characteristics and attendant cross-field particle transport on the collisionality of the SOL. The key diagnostics which must be operational for this study are: (a) A-port and F-port scanning probes operated in a fluctuation mode (The A-port probe will be used in both a spatially scanning and a fixed position mode.), (b) divertor probes operated in a fluctuation mode, (c) fast visible diodes viewing helium puffed from the A/B limiter capillary, (d) tangential Ly-alpha diode array, (e) limiter particle flux probes, and (f) edge thomson scattering. Day 2: Coarse density scans at different plasma currents and toroidal fields Start with reload of shot#1000517017 which was a 0.8 MA, 5.3 tesla shot, and dial up 0.5 MA. Shot#1-3 NL04 = 0.5x10^20 m^-2 Ip = 0.53 MA, Bt = 5.3 tesla Setup equilibrium and FSP/ASP target. Take two shots at each condition to optimize scanning probe insertion depths. Shot#4,5 - NL04 = 0.5, Ip = 0.53, Bt = 5.3 6,7 - NL04 = 0.7, Ip = 0.53, Bt = 5.3 8,9 - NL04 = 0.9, Ip = 0.53, Bt = 5.3 10,11 - NL04 = 1.0, Ip = 1.06, Bt = 5.3 12,13 - NL04 = 1.3, Ip = 1.06, Bt = 5.3 14,15 - NL04 = 0.7, Ip = 1.06, Bt = 5.3 16,17 - NL04 = 0.6, Ip = 0.8, Bt = 4 18,19 - NL04 = 0.9, Ip = 0.8, Bt = 4 20,21 - NL04 = 1.2, Ip = 0.8, Bt = 4 22,23 - NL04 = 1.2, Ip = 0.8, Bt = 6 24,25 - NL04 = 0.9, Ip = 0.8, Bt = 6 26,27 - NL04 = 0.6, Ip = 0.8, Bt = 6 |
| Jun 2 2000 09:01:16:280AM | 1000602001 | Joseph Snipes | Engineering Setup for 1000602 2 hours of ECDC in D2 in the morning finishing 1 hour before the run. Setup from shot 1000517017. Gas setup: B-Top 6 psi D2 Hybrid Enabled B-side lower 1 psi Argon Hybrid DISABLED C-side 30 psi D2 Hybrid Enabled J-bottom leave as is Hybrid DISABLED The following Gate Valves should be ENABLED, assuming no vacuum problems: ECE, VUV, DNB |
| Jun 2 2000 09:15:03:937AM | 1000602001 | Joseph Snipes | Shot 1: Copied shot 1000517017 and reduced Ip to 0.5 MA. Disrupted at 0.28 s probably due to a brick falling in. Good current rise though! |
| Jun 2 2000 09:45:42:327AM | 1000602002 | Joseph Snipes | Shot 2: Repeat with hopefully better results. Nope. Same disruption. |
| Jun 2 2000 09:46:25:717AM | 1000602003 | Joseph Snipes | Shot 3: Reduce the rate of rise of the current and program 0.53 MA in the flattop. Still disrupted early. |
| Jun 2 2000 10:17:55:000AM | 1000602004 | Joseph Snipes | Shot 4: Following Earl's suggestion, I recopied shot 1000517017 and let it go up to 0.8 MA and then reduced the current after 0.35 sec to 0.53 MA by 0.5 sec then flat. Also moved feedback jump in CLEARIN from 0.5 sec to 0.65 sec and reduced CLEARIN by 3 mm. Disrupted at .6 sec. |
| Jun 2 2000 10:34:44:920AM | 1000602005 | Joseph Snipes | Shot 5: Reduced CLEARIN by another cm or so to -2.5 cm during the flattop with a ramp during the current ramp down to 0.53 MA. Good shot. |
| Jun 2 2000 11:01:56:170AM | 1000602006 | Joseph Snipes | Shot 6: Repeat. Good shot. But, the current rise does not look good. |
| Jun 2 2000 11:17:30:857AM | 1000602007 | Joseph Snipes | Shot 7: Reduced pre-puff by 2 ms to 18 ms. Neutral pressure was higher and the current rise hesitated more. Otherwise a good shot. |
| Jun 2 2000 11:43:37:450AM | 1000602008 | Joseph Snipes | Shot 8: Reduced pre-puff by another 2 ms to 16 ms duration. TRAQ 2 failure, so the EFIT data will be corrupted. Good shot except the current rise hesitation is still there. |
| Jun 2 2000 11:56:14:420AM | 1000602009 | Joseph Snipes | Shot 9: Raise pre-puff to 17 ms duration. DNB raised their pressure by 1 mTorr so that will effectively increase the pre-puff as well. Good shot. Current rise looks better. |
| Jun 2 2000 12:10:17:810PM | 1000602010 | Joseph Snipes | Shot 10: Increased nl04 to 9 x 10^19 m^-2. Good shot with a MARFE. |
| Jun 2 2000 12:43:31:857PM | 1000602011 | Joseph Snipes | Shot 11: Repeat. Good shot with a MARFE. |
| Jun 2 2000 12:52:32:250PM | 1000602012 | Joseph Snipes | Shot 12: Copied shot 1000601023 and raised Ip to 1.06 MA. Increased CLEARIN by 1 mm to compensate. Decreased by 2.5 mm to increase the outer gap. Good shot. |
| Jun 2 2000 01:12:41:937PM | 1000602013 | Joseph Snipes | Shot 13: Removed TF blips that were present in the old shot for Amanda. Increased RCUR by 1 mm to reduce the outer gap. Enabled Ar puff from 0.35 - 0.39 sec. Good shot. |
| Jun 2 2000 01:30:53:090PM | 1000602014 | Joseph Snipes | Shot 14: Increased nl04 to 1.3 x 10^20 m^-2. Good shot. |
| Jun 2 2000 01:53:00:140PM | 1000602015 | Joseph Snipes | Shot 15: Decreased nl04 to 0.6 x 10^20 m^-2. Good shot. Only got 0.8 x 10^20 m^-2 though. |
| Jun 2 2000 02:21:13:903PM | 1000602016 | Joseph Snipes | Shot 16: nl04 set to 7 x 10^-19 m^-2. Increased pre-puff by 2 ms to 19 ms duration. Good shot. |
| Jun 2 2000 02:31:50:780PM | 1000602017 | Joseph Snipes | Shot 17: Reloaded 1000517017 and changed TF current from 150 kA to 112 kA to run 4 T after 0.15 sec. Reduced pre-puff by 2 ms to 17 ms since the DNB has increased their pressure by 0.5 mTorr. Good shot. Reached 4.095 T, not quite 4 T. |
| Jun 2 2000 03:04:04:653PM | 1000602018 | Joseph Snipes | Shot 18: Reduced TF current to 109 kA to get 4 T. Fizzle! Irby informs me that they pushed cooling a little too hard and there was a small leak just before the shot that may have led to the fizzle. |
| Jun 2 2000 03:13:00:903PM | 1000602019 | Joseph Snipes | Shot 19: Raise nl04 to 9 x 10^19 m^-2. Current rise looks fine. Good shot. |
| Jun 2 2000 03:41:07:590PM | 1000602020 | Joseph Snipes | Shot 20: Raise nl04 to 1.2 x 10^20 m^-2. Good shot. |
| Jun 2 2000 04:01:47:450PM | 1000602021 | Joseph Snipes | Shot 21: Raise TF current to 163.5 kA to reach 6 T after 0.15 s, then begin its rampdown at 1.25 s. Raise TF current limit to 170 kA to provide some headroom. Good shot. TF only reached 5.8 T though. |
| Jun 2 2000 04:19:46:000PM | 1000602022 | Joseph Snipes | Shot 22: Raise TF current limit to 175 kA and raise TF current to 169 kA from 0.15 - 1.4 sec. Lower nl04 to 9 x 10^19 m^-2. Good shot. |
| Jun 2 2000 04:47:38:233PM | 1000602023 | Joseph Snipes | Shot 23: Lower nl04 to 0.6 x 10^19 m^-2. Good shot. |
| Jun 2 2000 04:48:03:390PM | 1000602023 | Joseph Snipes | Summary: The machine ran very well. We had a slow start with a series of short disruptions because of the current dependence of the gaps and hence vertical stability of the plasma. However, by following both Marmar and Wolfe's suggestions for improving the plasma, we finally got some good low current shots. From then, on the run went smoothly except for one fizzle on shot 18 due to a brief leak that opened up right before the shot due to intense cooling. Brian was pleased with the data he got with the scanning probe. So, the run was quite successful. Good work! Scorecard: 23 shots, 22 plasmas, 1 fizzle. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:00:12:733AM | Plasma | Ok | |
| 2 | 09:20:31:903AM | Plasma | Ok | |
| 3 | 09:38:59:873AM | Plasma | Ok | |
| 4 | 10:02:51:780AM | Plasma | Ok | |
| 5 | 10:21:08:450AM | Plasma | Ok | |
| 6 | 10:44:11:950AM | Plasma | Ok | |
| 7 | 11:04:27:403AM | Plasma | Ok | |
| 8 | 11:25:33:030AM | Plasma | Ok | |
| 9 | 11:45:45:123AM | Plasma | Ok | |
| 10 | 12:07:04:810PM | Plasma | Ok | |
| 11 | 12:28:02:153PM | Plasma | Ok | |
| 12 | 12:47:29:403PM | Plasma | Ok | |
| 13 | 01:06:45:920PM | Plasma | Ok | |
| 14 | 01:26:35:153PM | Plasma | Ok | |
| 15 | 01:45:44:043PM | Plasma | Ok | |
| 16 | 02:05:07:937PM | Plasma | Ok | |
| 17 | 02:24:45:607PM | Plasma | Ok | |
| 18 | 02:46:11:577PM | Plasma | Ok | |
| 19 | 03:05:35:653PM | Plasma | Ok | |
| 20 | 03:27:03:543PM | Plasma | Ok | |
| 21 | 03:51:53:560PM | Plasma | Ok | |
| 22 | 04:14:24:500PM | Plasma | Ok | |
| 23 | 04:35:14:750PM | Plasma | Ok | |