| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | John Rice |
| Physics operator(s): | Joseph Snipes |
| Engineering operator(s): | Gary Dekow |
| Engineering Operator Run Comment |
| MP#301 ITB foot location movement via Ip scan; SL:Rice; PO:Snipes; EO:De |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:30:693PM |
| Author: To Be Determined |
| Session Leader Run Summary for 1020925 MP301* ITB Foot, Ip Scan There were several decent ITB discharges in this run, 6-12, which showed a strong reduction in the toroidal rotation velocity inside of the foot location, and modest reduction outside. However, H/D was steadily increasing during the course of the run, and there were multiple RF trips and H-L back transitions, so after shot 7 there were few steady ITBs. As such, there was no time to attempt the Ip scan. It does appear that the rotation velocity profile peaks near the resonance location, which may help explain how the ICRF induces the ITBs. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:16:270PM |
| Author: To Be Determined |
| Engineering setup for 1020924 MP#301 ITB foot location movement via Ip scan Session leader: J. Rice Physics Operator: J. Snipes ECDC overnight in D2 stopping by 07:30. Set up for possible ECDC in D2 between shots. Power systems the same as shot 1020822010 Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) leave J-Bottom as is Hybrid DISABLED (PG5) Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB ------------------------------------------------------------------------------- RF Setup: FMIT#1 and 2 transmitters in Run On by 08:00 ------------------------------------------------------------------------------- Run Plan: Obtain standard EDA H-modes at 0.8 MA, 5.3 T, nl04 = 0.7 x 10^20 m^-2 with 2 MW ICRF from D and E. Then, use the TF waveform from shot 1020920027 ramping the TF down to 4.5 T by 1 sec to attempt to get ITB's in EDA H-mode. Then, scan the plasma current down in steps as low as 0.6 or even 0.5 MA. Summary: Overall, the machine ran quite well. Of 32 shots, there were 4 fizzles and 28 plasmas only one of which disrupted in flattop. Shot 1 was an excellent standard EDA H-mode confinement shot and shot 7 was an excellent EDA ITB shot. From there on, problems developed in maintaining D and E port power. So, the rest of the run was devoted to attempting to tune up the ICRF. Part of the problem could have been the high H/(H+D) ratio exceeding 10% at times. We tried twice running ECDC in D2 between shots to reduce that ratio, but it was not terribly effective. Shot 1: Copied shot 1020822010 and set nl04 = 7 x 10^19 m^-2 and kept the TF current constant at 150 kA. Ip set to 0.8 MA. Good shot. Nice EDA. Shot 2: Copied TF waveform from shot 1020920027. Disrupted at 0.855 s near the bottom of the TF ramp. Prad increases around 0.8 s. Could be the tile. Shot 3: Repeat. Fizzle! Shot 4: Try increasing RXL by 4 mm to 0.015 during the flattop to attempt to avoid the tile. Good shot. Disrupted late just before 1.8 s at 400 kA. Two H-modes that are more ELM-free like. Shot 5: Raised nl04 by 10% to 7.7 x 10^19 m^-2. Good shot. Ramped down well. Two H-modes, more EDA-like perhaps with a brief ITB. Shot 6: Ramped down TF faster from 150 kA to 124 kA in 0.4 sec. Raised nl04 to 8.5 x 10^19 m^-2. Good EDA with ITB. Shot 7: Repeat. Good shot. Nice EDA with ITB. Shot 8: Repeat attempting to improve RF coupling. Good shot. EDA trips at 1 s then recovers. Shot 9: Repeat. Good shot. Nice long EDA with ITB. Shot 10: Returned RXL back to 0.011 m at Yijun's request to attempt to improve the ICRF coupling, hoping that the disruption does not also return. Good shot. Several EDA H-modes. No disruption. RF coupling no better. Shot 11: Repeat. Good shot. Several EDA H-modes. RF still tripping. Shot 12: Repeat. Good shot. Multiple H-modes again. Shot 13: Reduced RXL again to 0.004 m to increase the lower triangularity. Good shot. Multiple H-modes. Shot 14: Raised nl04 to 9.5 x 10^19 m^-2. Good shot. Multiple H-modes. Shot 15: Raised nl04 to 10.5 x 10^19 m^-2. Reduced RXL by another 4 mm to 0 to increase the lower triangularity still further to attempt to improve RF coupling. No improvement. RF still trips. Multiple H-modes Shot 16: Reload shot 1020925007 to try to get back to decent EDA's. Fizzle! Shot 17: Made EF4 current 7 A more negative to -1322 A at breakdown. Good shot. Nice EDA though there appear to be some small ELMs at 0.94 s. Shot 18: Reload shot 1020925001 back to 5.3 T flattop. Good shot. Two EDA H-modes. Not as good as shot 1 though. Shot 19: Reduced nl04 to 6 x 10^19 m^-2 to try to get back to the target density of shot 1. Only a short ELM-free H-mode. Density too low. Shot 20: Raised nl04 back to 7 x 10^19 m^-2. Good shot. Two EDA H-modes. E tripped, but D worked well. Shot 21: Reduced nl04 to 6.5 x 10^19 m^-3 to split the difference and try to return to the density of shot 1. Yijun separated the D and E pulses and 1.2 MW each was not enough to get into H-mode until late in the shot briefly. Shot 22: Repeat with more RF power. E port tripped. Two short H-modes late. ECDC between shots for 15 minutes. Shot 23: Repeat. Fizzle! Shot 24: Repeat. Good shot. Long EDA but only D port worked. Shot 25: Repeat. Good shot. Short ELM-free H-mode followed by a long steady EDA. Only D port again. Shot 26: Ramp the TF down to 4.7 T, which means ITF down to 130 kA. Good shot. Only D port worked. Brief H-mode after 1.2 s. Shot 27: Repeat. Good shot. Similar to shot 26. Shot 28: Raise nl04 to 7.15 x 10^19 m^-2. Good shot. A few H-modes. Shot 29: Repeat. Good shot. Similar to shot 28. Shot 30: Reduce ITF to 121 kA = 4.4 T. L-mode despite 2 MW of RF. ECDC for 10 minutes. Shot 31: Reduced prepuff by 4 ms to 23 ms duration anticipating higher gas after the ECDC. Fizzle! Shot 32: Repeat. Good shot. L-mode except for a brief H-mode after 1.4 s. |
| Session Leader Comments | |||
| Sep 25 2002 01:02:44:477PM | 1020925001 | John Rice | good EDA, 5.4T |
| Sep 25 2002 01:03:32:790PM | 1020925002 | John Rice | disrupted |
| Sep 25 2002 01:03:43:197PM | 1020925003 | John Rice | phiz |
| Sep 25 2002 01:04:26:153PM | 1020925004 | John Rice | ramped TF down late, velocity profile peak seems to move out with the resonance location |
| Sep 25 2002 01:05:09:607PM | 1020925005 | John Rice | good EDA, no ITB |
| Sep 25 2002 01:07:17:423PM | 1020925006 | John Rice | with faster rampdown of TF, good ITB formation |
| Sep 25 2002 01:07:34:940PM | 1020925007 | John Rice | with faster rampdown of TF, good ITB formation |
| Sep 25 2002 01:08:03:097PM | 1020925008 | John Rice | good ITB formation, but RFR trip |
| Sep 25 2002 01:08:24:923PM | 1020925009 | John Rice | good ITB formation |
| Sep 25 2002 01:11:37:993PM | 1020925010 | John Rice | good ITB formation, RF trips |
| Sep 25 2002 01:16:27:300PM | 1020925011 | John Rice | good ITB formation, H-L transitions |
| Sep 25 2002 01:19:08:960PM | 1020925012 | John Rice | good ITB formation, RF trips |
| Sep 25 2002 01:19:41:540PM | 1020925013 | John Rice | H-L xitions |
| Sep 25 2002 01:19:57:853PM | 1020925014 | John Rice | H-L xitions, RF trips |
| Sep 25 2002 01:20:10:040PM | 1020925015 | John Rice | H-L xitions, RF trips |
| Sep 25 2002 01:20:22:887PM | 1020925016 | John Rice | phiz |
| Sep 25 2002 01:23:41:080PM | 1020925017 | John Rice | RF trips |
| Sep 25 2002 01:23:57:157PM | 1020925018 | John Rice | 5.4 T, RF trips |
| Sep 25 2002 01:31:54:267PM | 1020925019 | John Rice | 5.4 T, ELM-free |
| Sep 25 2002 01:46:16:513PM | 1020925020 | John Rice | 5.4 T, RF trips |
| Sep 25 2002 01:51:56:040PM | 1020925020 | John Rice | 5.4 T, D and E separate |
| Sep 25 2002 02:32:31:570PM | 1020925021 | John Rice | 5.4 T, D and E separate |
| Sep 25 2002 02:32:51:337PM | 1020925022 | John Rice | E trips |
| Sep 25 2002 02:33:53:980PM | 1020925023 | John Rice | phiz, after long ECDC |
| Sep 25 2002 03:03:57:820PM | 1020925024 | John Rice | no E port |
| Sep 25 2002 03:18:54:970PM | 1020925025 | John Rice | no E port |
| Sep 25 2002 03:30:43:747PM | 1020925026 | John Rice | 4.7 T, E port trips |
| Sep 25 2002 04:02:36:133PM | 1020925027 | John Rice | 4.7 T, E port trips |
| Sep 25 2002 04:02:56:277PM | 1020925028 | John Rice | 4.7 T, RF trips, H-L |
| Sep 25 2002 04:13:25:763PM | 1020925029 | John Rice | 4.7 T, H-Ls |
| Sep 25 2002 04:27:42:603PM | 1020925030 | John Rice | 4.5 T, L-mode |
| Sep 25 2002 04:54:24:687PM | 1020925031 | John Rice | phiz |
| Physics Operator Comments | |||
| Sep 25 2002 08:24:49:013AM | Joseph Snipes | Engineering setup for 1020924 MP#301 ITB foot location movement via Ip scan Session leader: J. Rice Physics Operator: J. Snipes ECDC overnight in D2 stopping by 07:30. Set up for possible ECDC in D2 between shots. Power systems the same as shot 1020822010 Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) leave J-Bottom as is Hybrid DISABLED (PG5) Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB ------------------------------------------------------------------------------- RF Setup: FMIT#1 and 2 transmitters in Run On by 08:00 ------------------------------------------------------------------------------- Run Plan: Obtain standard EDA H-modes at 0.8 MA, 5.3 T, nl04 = 0.7 x 10^20 m^-2 with 2 MW ICRF from D and E. Then, use the TF waveform from shot 1020920027 ramping the TF down to 4.5 T by 1 sec to attempt to get ITB's in EDA H-mode. Then, scan the plasma current down in steps as low as 0.6 or even 0.5 MA. | |
| Sep 25 2002 09:10:09:287AM | 1020925001 | Joseph Snipes | Shot 1: Copied shot 1020822010 and set nl04 = 7 x 10^19 m^-2 and kept the TF current constant at 150 kA. Ip set to 0.8 MA. Good shot. Nice EDA. |
| Sep 25 2002 09:34:36:037AM | 1020925002 | Joseph Snipes | Shot 2: Copied TF waveform from shot 1020920027. Disrupted at 0.855 s near the bottom of the TF ramp. Prad increases around 0.8 s. Could be the tile. |
| Sep 25 2002 09:39:32:123AM | 1020925003 | Joseph Snipes | Shot 3: Repeat. Fizzle! |
| Sep 25 2002 10:02:25:137AM | 1020925004 | Joseph Snipes | Shot 4: Try increasing RXL by 4 mm to 0.015 during the flattop to attempt to avoid the tile. Good shot. Disrupted late just before 1.8 s at 400 kA. Two H-modes that are more ELM-free like. |
| Sep 25 2002 10:16:38:743AM | 1020925005 | Joseph Snipes | Shot 5: Raised nl04 by 10% to 7.7 x 10^19 m^-2. Good shot. Ramped down well. Two H-modes, more EDA-like perhaps with a brief ITB. |
| Sep 25 2002 10:20:26:030AM | 1020925006 | Joseph Snipes | Shot 6: Ramped down TF faster from 150 kA to 124 kA in 0.4 sec. Raised nl04 to 8.5 x 10^19 m^-2. Good EDA with ITB. |
| Sep 25 2002 10:42:06:980AM | 1020925007 | Joseph Snipes | Shot 7: Repeat. Good shot. Nice EDA with ITB. |
| Sep 25 2002 10:47:42:880AM | 1020925008 | Joseph Snipes | Shot 8: Repeat attempting to improve RF coupling. Good shot. EDA trips at 1 s then recovers. |
| Sep 25 2002 11:00:14:640AM | 1020925009 | Joseph Snipes | Shot 9: Repeat. Good shot. Nice long EDA with ITB. |
| Sep 25 2002 11:20:52:490AM | 1020925010 | Joseph Snipes | Shot 10: Returned RXL back to 0.011 m at Yijun's request to attempt to improve the ICRF coupling, hoping that the disruption does not also return. Good shot. Several EDA H-modes. No disruption. RF coupling no better. |
| Sep 25 2002 11:27:36:177AM | 1020925011 | Joseph Snipes | Shot 11: Repeat. Good shot. Several EDA H-modes. RF still tripping. |
| Sep 25 2002 11:39:18:073AM | 1020925012 | Joseph Snipes | Shot 12: Repeat. Good shot. Multiple H-modes again. |
| Sep 25 2002 12:02:17:120PM | 1020925013 | Joseph Snipes | Shot 13: Reduced RXL again to 0.004 m to increase the lower triangularity. Good shot. Multiple H-modes. |
| Sep 25 2002 12:11:53:723PM | 1020925014 | Joseph Snipes | Shot 14: Raised nl04 to 9.5 x 10^19 m^-2. Good shot. Multiple H-modes. |
| Sep 25 2002 12:26:25:267PM | 1020925015 | Joseph Snipes | Shot 15: Raised nl04 to 10.5 x 10^19 m^-2. Reduced RXL by another 4 mm to 0 to increase the lower triangularity still further to attempt to improve RF coupling. No improvement. RF still trips. Multiple H-modes |
| Sep 25 2002 12:34:44:580PM | 1020925016 | Joseph Snipes | Shot 16: Reload shot 1020925007 to try to get back to decent EDA's. Fizzle! |
| Sep 25 2002 12:49:52:577PM | 1020925017 | Joseph Snipes | Shot 17: Made EF4 current 7 A more negative to -1322 A at breakdown. Good shot. Nice EDA though there appear to be some small ELMs at 0.94 s. |
| Sep 25 2002 01:04:49:107PM | 1020925018 | Joseph Snipes | Shot 18: Reload shot 1020925001 back to 5.3 T flattop. Good shot. Two EDA H-modes. Not as good as shot 1 though. |
| Sep 25 2002 01:18:47:257PM | 1020925019 | Joseph Snipes | Shot 19: Reduced nl04 to 6 x 10^19 m^-2 to try to get back to the target density of shot 1. Only a short ELM-free H-mode. Density too low. |
| Sep 25 2002 01:35:06:290PM | 1020925020 | Joseph Snipes | Shot 20: Raised nl04 back to 7 x 10^19 m^-2. Good shot. Two EDA H-modes. E tripped, but D worked well. |
| Sep 25 2002 01:46:10:030PM | 1020925021 | Joseph Snipes | Shot 21: Reduced nl04 to 6.5 x 10^19 m^-3 to split the difference and try to return to the density of shot 1. Yijun separated the D and E pulses and 1.2 MW each was not enough to get into H-mode until late in the shot briefly. |
| Sep 25 2002 02:02:37:060PM | 1020925022 | Joseph Snipes | Shot 22: Repeat with more RF power. E port tripped. Two short H-modes late. |
| Sep 25 2002 02:03:08:513PM | 1020925022 | Joseph Snipes | Shot 22: ECDC between shots for 15 minutes. |
| Sep 25 2002 02:34:23:857PM | 1020925023 | Joseph Snipes | Shot 23: Repeat. Fizzle! |
| Sep 25 2002 02:54:12:893PM | 1020925024 | Joseph Snipes | Shot 24: Repeat. Good shot. Long EDA but only D port worked. |
| Sep 25 2002 03:07:02:387PM | 1020925025 | Joseph Snipes | Shot 25: Repeat. Good shot. Short ELM-free H-mode followed by a long steady EDA. Only D port again. |
| Sep 25 2002 03:21:01:413PM | 1020925026 | Joseph Snipes | Shot 26: Ramp the TF down to 4.7 T, which means ITF down to 130 kA. Good shot. Only D port worked. Brief H-mode after 1.2 s. |
| Sep 25 2002 03:39:59:623PM | 1020925027 | Joseph Snipes | Shot 27: Repeat. Good shot. Similar to shot 26. |
| Sep 25 2002 03:57:03:640PM | 1020925028 | Joseph Snipes | Shot 28: Raise nl04 to 7.15 x 10^19 m^-2. Good shot. A few H-modes. |
| Sep 25 2002 04:13:30:547PM | 1020925029 | Joseph Snipes | Shot 29: Repeat. Good shot. Similar to shot 28. |
| Sep 25 2002 04:26:45:727PM | 1020925030 | Joseph Snipes | Shot 30: Reduce ITF to 121 kA = 4.4 T. L-mode despite 2 MW of RF. |
| Sep 25 2002 04:27:07:493PM | 1020925030 | Joseph Snipes | Shot 30: ECDC for 10 minutes. |
| Sep 25 2002 04:56:39:317PM | 1020925031 | Joseph Snipes | Shot 31: Reduced prepuff by 4 ms to 23 ms duration anticipating higher gas after the ECDC. Fizzle! |
| Sep 25 2002 05:08:21:090PM | 1020925032 | Joseph Snipes | Shot 32: Repeat. Good shot. L-mode except for a brief H-mode after 1.4 s. |
| Sep 25 2002 05:10:45:623PM | 1020925032 | Joseph Snipes | Summary: Overall, the machine ran quite well. Of 32 shots, there were 4 fizzles and 28 plasmas only one of which disrupted in flattop. Shot 1 was an excellent standard EDA H-mode confinement shot and shot 7 was an excellent EDA ITB shot. From there on, problems developed in maintaining D and E port power. So, the rest of the run was devoted to attempting to tune up the ICRF. Part of the problem could have been the high H/(H+D) ratio exceeding 10% at times. We tried twice running ECDC in D2 between shots to reduce that ratio, but it was not terribly effective. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:04:22:433AM | Plasma | Ok | |
| 2 | 09:21:14:933AM | Plasma | Ok | |
| 3 | 09:35:05:960AM | Plasma | Ok | |
| 4 | 09:50:08:443AM | Plasma | Ok | |
| 5 | 10:04:36:830AM | Plasma | Ok | |
| 6 | 10:17:40:997AM | Plasma | Ok | |
| 7 | 10:30:52:037AM | Plasma | Ok | |
| 8 | 10:44:07:267AM | Plasma | Ok | |
| 9 | 10:57:50:963AM | Plasma | Ok | |
| 10 | 11:10:43:300AM | Plasma | Ok | |
| 11 | 11:24:19:683AM | Plasma | Ok | |
| 12 | 11:37:51:180AM | Plasma | Ok | |
| 13 | 11:52:35:647AM | Plasma | Ok | |
| 14 | 12:05:31:710PM | Plasma | Ok | |
| 15 | 12:18:23:063PM | Plasma | Ok | |
| 16 | 12:32:15:870PM | Plasma | Ok | |
| 17 | 12:46:44:633PM | Plasma | Ok | |
| 18 | 01:01:41:990PM | Plasma | Ok | |
| 19 | 01:15:52:347PM | Plasma | Ok | |
| 20 | 01:28:52:120PM | Plasma | Ok | |
| 21 | 01:41:58:177PM | Plasma | Ok | |
| 22 | 01:55:55:923PM | Plasma | Ok | |
| 23 | 02:32:03:100PM | Plasma | Ok | |
| 24 | 02:46:51:770PM | Plasma | Ok | |
| 25 | 03:01:08:343PM | Plasma | Ok | |
| 26 | 03:16:41:280PM | Plasma | Ok | |
| 27 | 03:36:23:927PM | Plasma | Ok | |
| 28 | 03:49:15:250PM | Plasma | Ok | |
| 29 | 04:03:14:527PM | Plasma | Ok | |
| 30 | 04:16:46:820PM | Plasma | Ok | |
| 31 | 04:51:48:213PM | Plasma | Ok | |
| 32 | 05:05:34:490PM | Plasma | Ok | |