| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Spencer Pitcher |
| Physics operator(s): | Dmitri Mossessian |
| Engineering operator(s): | Frank Silva |
| Engineering Operator Run Comment |
| MP#230/Mossessian, Silva |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:21:460PM |
| Author: To Be Determined |
MP 230: The Effect of Divertor Baffling on H-mode Power Threshold Plan: We will use standard 0.8 MA, 5.4 T discharges with a variety of target plasma densities (nl04 = 0.7 to 1.4) to investigate the H-mode power threshold. RF heating will be programmed to give slow linear ramps. Identical discharges will be run, first with flaps closed for the entire discharge and then a comparison discharge with flaps open. Trace amounts of argon and helium will be used to investigate divertor screening. Summary: The machine ran very well. RF also ran quite well, after spending a shot or two at new densities to tune..good RF ramps generally attained. The flappers appear to have no measurable effect on the H-mode threshold (within an error of around 10%). Identical discharges were run with and without the flapper. As usual, with flapper open at moderate to high density, the divertor neutral pressure is reduced by a factor of ~ 2, with no measurable effect on the midplane pressure. The results cannot address whether main chamber neutrals affect confinement. --------------------------------------------------------------------- The best shot comparisons are: nl04 shot shot (flaps open) 0.7 20,22 21 0.9 4 5 1.1 9 10 1.4 16 15 During the day the flapper power supply got progressively sicker, so that for shots 24, 25 it is unclear to what degree the flaps were open. Detailed analysis of the flapper waveforms could possibly determine this. Detailed shot summary below. --------------------------------------------------------------------- ***shot 2 flaps closed nl04 = 0.94, good RF ramp, good EDA Pthr = 0.92 MW ***shot 3 repeat, flaps closed, RF tuning changed a little nl04 = 0.96, good RF ramp, good EDA Pthr = 1.03 MW ***shot 4 repeat, flaps forced closed, RF tuning not touched chromex 6678 (reasonable signal), helium thru AB limiter nl04 = 0.92, good RF ramp, good EDA Pthr = 1.03 MW ***shot 5 repeat, flaps open, RF tuning not touched chromex 6678 (increase slit), helium thru AB limiter nl04 = 0.94, good RF ramp, good EDA Pthr = 1.03 MW......no measurable effect of flapper on threshold ***shot 6 repeat, flaps closed, RF tuning not touched chromex 6678, helium thru AB limiter RF finger problem!...not a good ramp, lower power ***shot 7 repeat, flaps closed, RF tuning not touched RF problems...not a very good ramp. Discharge is a nice example of hysteresis....ie raise power over threshold and then drop power below and it stays in EDA H-mode. ***shot 8 raise density, nl04 = 1.1, reduce right gap, flaps closed not bad RF ramp....will try to improve for next shot ***shot 9 repeat, flaps closed ***shot 10 repeat, flaps open ***shot 11 raise density, nl04 = 1.4, flaps open RF ramp ok, no H-mode, right gap increasing during shot next shot....fix right gap, increase power, change RF tuning ***shot 12 flaps open, brief ELM-free H-mode, Pthr = 1.04 MW ***shot 13 flaps closed, good RF ramp, no H-mode! ***shot 14 repeat, flaps open, drop density to nl04 = 1.3 no plasma ***shot 15 repeat, flaps open Pthr = 1.4 MW, nl04 = 1.4 good RF ramp ***shot 16 repeat, flaps closed ***shot 17,18 no plasma pause to take ninja test shot # = 2129 ***shot 19 flaps closed, drop density to nl04 = 0.7 RF ramp not that good, Pthr = 1.2 MW, nel04 = 0.84 ***shot 20 flaps closed, Pthr = 0.96 MW, nl04 = 0.8 ***shot 21 flaps open, Pthr = 0.72 MW, nl04 = 0.77 ***shot 22 flaps closed, Pthr = 0.9 MW, nl04 = 0.72 kaiser helium to inner wall end of threshold study ***shot 23 long, steady RF pulse...got 3 EDA periods flapper open ***shot 24 tune up RF, very long steady-state EDA...very nice flapper open ***shot 25 repeat flapper starts open and closes quickly at t = 1.1 s (flappers take 32 ms to close) flapper power supply appears to be drooping |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:09:333PM |
| Author: To Be Determined |
| Physics operator summary for run 990921: ______________________________ Run Plan for 990921: SL: S.PItcher PO: D.Mossessian Setup Power Supplies from Shot 990920003 Two Hours of ECDC in D2 prior to run. Gas setup: Fill B-Top with 6 psi D2, Hybrid Enabled Fill B-side lower with 1 psi Ar, Hybrid Enabled Fill B-side upper with 6 psi H2, Hybrid DISABLED Fill C-Side with 30 psi D2, Hybrid Enabled J-Bottom as is, Hybrid DISABLED ECE and VUV valves enabled, if no vacuum problems Run plan: Run in support of MP#230 Flapper Effect on Thresh. _____________________________________________ Summary: Our "toroidal chamber with magnetic windings" ran very well today. First shot was OH and B_side_upper gas tests - all went OK. Then out of 24 shots there was 2 fizzles, first (990921014) was probably because of the previous shot disruption, second (990921018) was for unknown reason. There was a problem with TCI nl_04 on shot 14. On shot 990921017 there was a CAMAC initialization problem. Scorecard: 25 shots 2 fizzles 0 duds 1 test ______________________________________________________ 990921001 OH test and B_side_upper test. Pulse gas 2 programmed for 50 msec pulse at .6 sec OH's OK. For next shot: Load 990915003, .8 MA, 5.4 T, no ECE sweep, n0=0.9e20 990921002 Good shot. RF ramps up to 2 MW. EDA from .75 to 1.45 interrupted by an injection at 1.28. For next shot: Extend TF current flattop to 1.5 sec. 990921003 Good shot. RF ramps up to 2 MW. EDA from .8 to 1.5. For next shot: No PCS changes. 990921004 Good shot. RF ramps up to 2 MW. EDA from .8 to 1.5. For next shot: No PCS changes. 990921005 Good shot. RF ramps up to 2 MW. EDA from .8 to 1.5. For next shot: No PCS changes. 990921006 Good shot. Two very small H-modes For next shot: No PCS changes. 990921007 Good shot. EDA from .8 to 1.5 sec. E port RF has problems. For next shot: Set target density to 1.1e20 Changed RCUR in attempt to hold right gap at 1 cm rom .5 sec 990921008 Plasma. EDA from .8 to 1.5 sec with large injection at 1.3 sec. RF E and D ramp up to 2 MW. For next shot: No changes 990921009 Plasma. Long EDA. RF ramps up to 2MW and then J-port adds another noisy .5 MW. Right gap constant at 1 cm from .5 to 1.2 sec. For next shot: no changes 990921010 Plasma. Long EDA. For next shot: set target density to 1.4e20. Increased pulse_gas_3 990921011 Plasma. Density 1.5e20. RF ramps up to 1.6 MW, no H mode. Right gap is moving up from 1 cm to 1.5 cm. For next shot: Program rampdown of the right gap trying to keep it at 1 cm. 990921012 Plasma. RF ramps to 1 MW. ELM-free H mode from .8 to 1 sec. For next shot: no changes 990921013 Plasma. Density 1.4e20. Disrupted at 1.2 sec - large injection. RF ramps to 2 MW. No H mode. For next shot: drop density to 1.3e20 990921014 Fizzle. No TCI signal. For next shot: no changes 990921015 Plasma. EDA H mode from .9 to 1.5. RF ramps up to 2.3 MW For nex shot: no change. 990921016 Plasma. EDA H mode from .9 to 1.5. RF ramps up to 2.3 MW For nex shot: set density to 0.7e20. Reduce gas a little. 990921017 Camac initialization problem. Returned to RECOOL from INIT. Do "no power" shot. 990921018 Fizzle. Bz looks a little high. For next shot: Drop EF4 current by 15 A. 990921019 Plasma. Density .8e20. E port RF faults, but D and J ramp up to 2 MW. ELM-free H mode from .84 to 1 sec, EDA from 1.2 to 1.5 sec. For nesxt shot: no changes 990921020 Plasma. Multiple ELM free H modes For nesxt shot: no changes 990921021 Plasma. Density .8e20. Multiple ELM free H modes For nesxt shot: no changes 990921022 Plasma. Density .8e20. Multiple ELM free H modes For nesxt shot: set density to 1.0e20, adjusted RCUR for right gap. 990921023 Plasma. Density didn't quite get to 1.e20. Two ELM free H modes and one EDA. RF at 1 MW. Right gap constant at 1 cm. For nesxt shot: change nl_04 and gas puff a little to get target density. 990921024 Plasma. Density 1.e20 at .5 sec. Then steady state EDA for 1 sec. RF const at 2 MW. For next shot: no changes 990921025 Plasma. Steady state EDA from .5 to 1.5 sec. |
| Session Leader Comments | |||
| Sep 21 1999 09:22:43:090AM | 990921002 | Spencer Pitcher | flaps closed nl04 = 0.94, good RF ramp, good EDA Pthr = 0.92 MW |
| Sep 21 1999 09:37:11:623AM | 990921003 | Spencer Pitcher | repeat, flaps closed, RF tuning changed a little nl04 = 0.96, good RF ramp, good EDA Pthr = 1.03 MW |
| Sep 21 1999 09:54:02:373AM | 990921004 | Spencer Pitcher | repeat, flaps forced closed, RF tuning not touched chromex 6678 (reasonable signal), helium thru AB limiter nl04 = 0.92, good RF ramp, good EDA Pthr = 1.03 MW |
| Sep 21 1999 10:11:34:983AM | 990921005 | Spencer Pitcher | repeat, flaps open, RF tuning not touched chromex 6678 (increase slit), helium thru AB limiter nl04 = 0.94, good RF ramp, good EDA Pthr = 1.03 MW......no measurable effect of flapper on threshold |
| Sep 21 1999 10:27:14:187AM | 990921006 | Spencer Pitcher | repeat, flaps closed, RF tuning not touched chromex 6678, helium thru AB limiter RF finger problem!...not a good ramp, lower power |
| Sep 21 1999 11:10:40:187AM | 990921007 | Spencer Pitcher | repeat, flaps closed, RF tuning not touched RF problems...not a very good ramp. Discharge is a nice example of hysteresis....ie raise power over threshold and then drop power below and it stays in EDA H-mode. |
| Sep 21 1999 11:11:34:840AM | 990921008 | Spencer Pitcher | raise density, nl04 = 1.1, reduce right gap, flaps closed not bad RF ramp....will try to improve for next shot |
| Sep 21 1999 11:21:37:403AM | 990921009 | Spencer Pitcher | repeat, flaps closed |
| Sep 21 1999 12:10:17:920PM | 990921010 | Spencer Pitcher | repeat, flaps open |
| Sep 21 1999 12:13:16:530PM | 990921011 | Spencer Pitcher | raise density, nl04 = 1.4, flaps open RF ramp ok, no H-mode, right gap increasing during shot next shot....fix right gap, increase power, change RF tuning |
| Sep 21 1999 01:52:56:170PM | 990921012 | Spencer Pitcher | flaps open, brief ELM-free H-mode, Pthr = 1.04 MW |
| Sep 21 1999 01:53:31:733PM | 990921013 | Spencer Pitcher | flaps closed, good RF ramp, no H-mode! |
| Sep 21 1999 01:53:56:000PM | 990921014 | Spencer Pitcher | repeat, flaps open, drop density to nl04 = 1.3 no plasma |
| Sep 21 1999 01:54:27:170PM | 990921015 | Spencer Pitcher | repeat, flaps open Pthr = 1.4 MW, nl04 = 1.4 good RF ramp |
| Sep 21 1999 03:18:50:500PM | 990921016 | Spencer Pitcher | repeat, flaps closed |
| Sep 21 1999 03:19:13:983PM | 990921017 | Spencer Pitcher | no plasma |
| Sep 21 1999 03:20:00:967PM | 990921018 | Spencer Pitcher | no plasma pause to take ninja test shot # = 2129 |
| Sep 21 1999 03:48:52:090PM | 990921019 | Spencer Pitcher | flaps closed, drop density to nl04 = 0.7 RF ramp not that good, Pthr = 1.2 MW, nel04 = 0.84 |
| Sep 21 1999 03:49:28:297PM | 990921020 | Spencer Pitcher | flaps closed, Pthr = 0.96 MW, nl04 = 0.8 |
| Sep 21 1999 04:15:39:140PM | 990921021 | Spencer Pitcher | flaps open, Pthr = 0.72 MW, nl04 = 0.77 |
| Sep 21 1999 04:23:43:890PM | 990921022 | Spencer Pitcher | flaps closed, Pthr = 0.9 MW, nl04 = 0.72 kaiser helium to inner wall end of threshold study |
| Sep 21 1999 06:31:01:327PM | 990921023 | Spencer Pitcher | long, steady RF pulse...got 3 EDA periods flapper open |
| Sep 21 1999 06:31:20:030PM | 990921024 | Spencer Pitcher | tune up RF, very long steady-state EDA...very nice flapper open |
| Sep 21 1999 06:31:52:090PM | 990921025 | Spencer Pitcher | repeat flapper starts open and closes quickly at t = 1.1 s (flappers take 32 ms to close) flapper power supply appears to be drooping |
| Physics Operator Comments | |||
| Sep 21 1999 08:57:59:840AM | Dmitri Mossessian | Run Plan for 990921: SL: S.PItcher PO: D.Mossessian Setup Power Supplies from Shot 990920003 Two Hours of ECDC in D2 prior to run. Gas setup: Fill B-Top with 6 psi D2, Hybrid Enabled Fill B-side lower with 1 psi Ar, Hybrid Enabled Fill B-side upper with 6 psi H2, Hybrid DISABLED Fill C-Side with 30 psi D2, Hybrid Enabled J-Bottom as is, Hybrid DISABLED ECE and VUV valves enabled, if no vacuum problem. ________________________ MP 230: The Effect of Divertor Baffling on H-mode Power Threshold We will use standard 1 MA, 5.4 T discharges with a variety of target plasma densities (nl04 = 0.6 to 2.0) to investigate the H-mode power threshold. RF heating will be programmed to give slow linear ramps. Identical discharges will be run, first with flaps closed for the entire discharge and then a comparison discharge with flaps open. Trace amounts of argon and helium will be used to investigate divertor screening. ____________________________________ Load PCFS from 990920019, 1MA, 5.4 T (with ECE sweep at 1sec), n0=1.0e20 _________________________________________ Cold start OK. Load clean. | |
| Sep 21 1999 09:04:36:983AM | 990921001 | Dmitri Mossessian | OH test and B_side_upper test. Pulse gas 2 programmed for 50 msec pulse at .6 sec OH's OK. For next shot Session leader requested shot 990915003 to be loaded. Load 990915003, .8 MA, 5.4 T, no ECE sweep, n0=0.9e20 |
| Sep 21 1999 09:18:40:263AM | 990921002 | Dmitri Mossessian | Good shot. RF ramps up to 2 MW. EDA from .75 to 1.45 interrupted by an injection at 1.28. For next shot: Extend TF current flattop to 1.5 sec. |
| Sep 21 1999 09:32:53:060AM | 990921003 | Dmitri Mossessian | Good shot. RF ramps up to 2 MW. EDA from .8 to 1.5. For next shot: No PCS changes. |
| Sep 21 1999 09:51:54:937AM | 990921004 | Dmitri Mossessian | Good shot. RF ramps up to 2 MW. EDA from .8 to 1.5. For next shot: No PCS changes. |
| Sep 21 1999 10:17:05:513AM | 990921005 | Dmitri Mossessian | Good shot. RF ramps up to 2 MW. EDA from .8 to 1.5. For next shot: No PCS changes. |
| Sep 21 1999 10:28:04:827AM | 990921006 | Dmitri Mossessian | Good shot. RF fault. For next shot: No PCS changes. |
| Sep 21 1999 10:41:58:653AM | 990921007 | Dmitri Mossessian | Good shot. EDA from .8 to 1.5 sec E port RF has problems. For next shot: Set target density to 1.1e20 |
| Sep 21 1999 11:03:25:937AM | 990921008 | Dmitri Mossessian | Before shot 8: Changed RCUR in attempt to hold right gap at 1 cm rom .5 sec Plasma. EDA from .8 to 1.5 sec with large injection at 1.3 sec. RF E and D ramp up to 2 MW. For next shot: No changes |
| Sep 21 1999 11:24:18:170AM | 990921009 | Dmitri Mossessian | Plasma. Long EDA. RF ramps up to 2MW and then J-port adds another noisy .5 MW. Right gap constant at 1 cm from .5 to 1.2 sec. For next shot: no changes |
| Sep 21 1999 11:58:21:733AM | 990921010 | Dmitri Mossessian | Plasma. Long EDA. For next shot: set target density to 1.4e20. Increased pulse_gas_3 |
| Sep 21 1999 12:10:25:687PM | 990921011 | Dmitri Mossessian | Plasma. DEnsity 1.5e20. RF ramps up to 1.6 MW, no H mode. Right gap is moving up from 1 cm to 1.5 cm. For next shot: Program rampdown of the right gap trying to keep it at 1 cm. |
| Sep 21 1999 12:25:17:967PM | 990921012 | Dmitri Mossessian | Plasma. RF ramps to 1 MW. ELM-free H mode from .8 to 1 sec. For next shot: no changes |
| Sep 21 1999 12:49:29:810PM | 990921013 | Dmitri Mossessian | Plasma. Density 1.4e20. Disrupted at 1.2 sec - large injection. RF ramps to 2 MW. No H mode. For next shot: drop density to 1.3e20 |
| Sep 21 1999 01:50:27:090PM | 990921014 | Dmitri Mossessian | Fizzle. No TCI signal. |
| Sep 21 1999 01:51:36:217PM | 990921015 | Dmitri Mossessian | No PCS changes was made for this shot. Plasma. EDA H mode from .9 to 1.5. RF ramps up to 2.3 MW For nex shot: no change. |
| Sep 21 1999 02:09:52:810PM | 990921016 | Dmitri Mossessian | Plasma. EDA H mode from .9 to 1.5. RF ramps up to 2.3 MW For nex shot: set density to 0.7e20. Reduce gas a little. |
| Sep 21 1999 02:44:33:890PM | 990921017 | Dmitri Mossessian | Camac initialization problem. Returned yo RECOOL from INIT. Do "no power" shot. |
| Sep 21 1999 02:47:14:780PM | 990921018 | Dmitri Mossessian | Fizzle. Bz looks a little high. For next shot: Drop EF4 current by 15 A. |
| Sep 21 1999 03:28:29:497PM | 990921019 | Dmitri Mossessian | Plasma. Density .8e20. E port RF faults, but D and J ramp up to 2 MW. ELM-free H mode from .84 to 1 sec, EDA from 1.2 to 1.5 sec. For nesxt shot: no changes |
| Sep 21 1999 03:46:14:590PM | 990921020 | Dmitri Mossessian | Plasma. Density .8e20. Multiple ELM free H modes For nesxt shot: no changes |
| Sep 21 1999 03:56:25:670PM | 990921021 | Dmitri Mossessian | Plasma. Density .8e20. Multiple ELM free H modes For nesxt shot: no changes |
| Sep 21 1999 04:17:39:123PM | 990921022 | Dmitri Mossessian | Plasma. Density .8e20. Multiple ELM free H modes For nesxt shot: set density to 1.0e20, adjusted RCUR for right gap. |
| Sep 21 1999 04:38:45:577PM | 990921023 | Dmitri Mossessian | Plasma. Density didn't quite get to 1.e20. Two ELM free H modes and one EDA. RF stays at 1 MW. Right gap constant at 1 cm. For nesxt shot: change nl_04 and gas puff a little to get target density. |
| Sep 21 1999 04:50:07:420PM | 990921024 | Dmitri Mossessian | Plasma. Density 1.e20 at .5 sec. Then steady state EDA for 1 sec. RF const at 2 MW. For next shot: no changes |
| Sep 21 1999 05:15:15:373PM | 990921025 | Dmitri Mossessian | PLasma. Steady state EDA from .5 to 1.5 sec. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:57:35:170AM | Test | Ok | OH1, OH2u,l ok, no pulse B side upper |
| 2 | 09:07:23:297AM | Plasma | Ok | no faults/plasma |
| 3 | 09:25:29:450AM | Plasma | Ok | no faults/plasma |
| 4 | 09:42:25:797AM | Plasma | Ok | (null) |
| 5 | 09:59:31:153AM | Plasma | Ok | no faults/plasma |
| 6 | 10:18:22:123AM | Plasma | Ok | no faults/plasma |
| 7 | 10:34:20:310AM | Plasma | Ok | no faults/plasma |
| 8 | 10:54:39:750AM | Plasma | Ok | (null) |
| 9 | 11:10:39:640AM | Plasma | Ok | (null) |
| 10 | 11:29:15:357AM | Plasma | Ok | (null) |
| 11 | 11:58:38:390AM | Plasma | Ok | (null) |
| 12 | 12:15:11:170PM | Plasma | Ok | (null) |
| 13 | 12:34:52:857PM | Plasma | Ok | (null) |
| 14 | 12:53:55:750PM | Plasma | Ok | (null) |
| 15 | 01:42:09:950PM | Plasma | Ok | (null) |
| 16 | 01:58:30:560PM | Plasma | Ok | (null) |
| 17 | 02:16:16:717PM | Plasma | Ok | (null) |
| 18 | 02:38:17:107PM | Plasma | Ok | (null) |
| 19 | 03:12:26:623PM | Plasma | Ok | (null) |
| 20 | 03:28:21:030PM | Plasma | Ok | (null) |
| 21 | 03:47:14:827PM | Plasma | Ok | (null) |
| 22 | 04:08:41:780PM | Plasma | Ok | (null) |
| 23 | 04:25:12:263PM | Plasma | Ok | (null) |
| 24 | 04:43:28:653PM | Plasma | Ok | (null) |
| 25 | 05:02:12:590PM | Plasma | Ok | (null) |