| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Yuichi Takase |
| Physics operator(s): | Joseph Snipes |
| Engineering operator(s): | Vinny Bertolino,Frank Silva,Joe Daigle |
| Engineering Operator Run Comment |
| 7.9 |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:15:507PM |
| Author: To Be Determined |
| Run summary 960222 MP117 7.9T D(He3) SL: Takase PO: Snipes EO: Silva/Bertolino/Daigle Plan: Clean-up shots at 5.3T until H-mode improves, then: 1. 8T, 1.2MA heating (try to evaluate absorption again) 2. Try PEP mode (Li/D2 pellets) Overnight He ECDC was performed (11 hours). After EF1 tests, the problem appeared to have gone away. We took a fiducial shot and a 1MA, 5.3T conditioning shot. H-mode quality was good (ELM-free), with an H factor of almost 2.5 for shot 09 (close to the best H-mode). Comparison of fiducial shots from yesterday and today suggests that overnight He ECDC is beneficial for eliminating the "H_alpha blob", if that is what we want to do (ELM-free H-mode leads to impurity accumulation and eventually degradation of confinement). The H_alpha blob does allow steady-state H-mode operation. With well-conditioned (degassed) walls, H_alpha blob can be controlled by gas puffing during H-mode, so this may be how we want to operate. With gassed-up walls it is difficult to avoid H_alpha blobs. No 8T shots. Shots 01-05 were EF1 tests. EF1 problem has gone away, but not really fixed. shot 06 pla fiducial, 3 H-modes, no D-port (crowbarred before the shot) 07 dud EF1 problem is back! 08 dud same, EF1 problem 09 pla good H-mode, 2.55MW, 200kJ, H=2.5 PF breaker broke End of plasma run. A TF breaker (one out of four) was swapped in for the failed PF breaker. EF1 testing will continue for the rest of the day. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:56:190PM |
| Author: To Be Determined |
| Attempt to run MP 117 ICRF H-modes at 7.9 T D(He3) Engineer in charge: Frank Silva Physicist in charge: Joseph Snipes Session leader: Yuichi Takase Li pellets (PEP) modes, attempt to measure RF power absorption with the diamagnetic stored energies compared to fast EFIT stored energies. Attempt full performance plasmas at 1.2 MA and 7.9 T with all available RF power. Shot 6 was a standard fiducial shot, but the McPherson gate valve did not open because it was set wrong. Shots 7 and 8 had EF1L failures, then shot 9 was a good H-mode shot with and H factor of about 2.4 until there was a moly injection that degraded the stored energy. Shot 9 was another EF1L failure. After shot 960222009, the PF breaker failed. So, there were no further plasmas today. The rest of the day will be devoted to swapping out one of the TF breakers to replace the broken PF breaker and do power supply testing. Scorecard: 4 attempts, 2 plasmas, 2 EF1L failures. (5.3 T part of 7.9 T run) 8 attempts, 2 plasmas, 4 duds, 2 fizzles (3.5 T breakdown studies) Shot Log --------- Shot 1 :EF1L test. Failed like yesterday. Shot 2 :Repeat. EF1L worked fine. Shot 3 :Reversed polarity. Worked O.K. but had 200 V glitches. Shot 4 :Repeat at higher voltage. Shot 5 :Another EF1L test. Looks O.K. Shot 6 :Start with a fiducial copied from shot 960213011 but with Br offset changed from 7.4 mT to 5.4 mT. Good shot. H-modes from 0.76 to 1.02 sec. Shot 7 :Copied shot 960214027 but changed Br offset to 5.4 mT. Ip = 1 MA, Bt = 5.3 T, nl04 ramping from 8 x 10^19 m^-2 to 1 x 10^20 m^-2 from 0.65 to 0.87 sec. EF1L failed. No plasma. Shot 8 :Repeat. EF1L failed again. Shot 9 :Repeat. Good shot. H-modes from 0.63 to 1.1 sec. Reached nearly 200 kJ of stored energy. Shots 10 - 19:Power supply tests Shot 20:Copied shot 960118032. Changed TF to no hybrid control with a set point at 100 kA, which should be about 3.5 T. Set Br offset to 5.4 mT. Ip = 580 kA, nl04 set to 5 x 10^19 m^-2. Dud. Shot 21:Changed EF1U and L currents before t=0 from -4800 to -5000 A. Dud. Too close to the rail on EF1U. Shot 22:Increased pre-puff by 3 msec to 14 msec flattop. Reduced Br by another 0.4 mT to 5.0 mT. OH2 changed from -22200 to -23200 A. EF1U and L returned to -4800 A. Shot 23:Set Br offset to 4 mT, increased pre-puff by 2 msec to 16 msec. Shot 24:Increased pre-puff by 9 msec to 25 msec. Changed EF4 current from -1150 to -1200 A. Got breakdown. Shot 25:Increased Br offset by 0.5 mT to 4.5 mT. Reduced pre-puff by 5 msec to 20 msec. Got plasma. Disrupted at 0.55 sec. Ran limited on the outboard limiter. Shot 26:Reduced RCUR from 0.675 to 0.669 m during the flattop. Fizzle. Shot 27:One more time. Disrupted at 0.185 sec. Probably needs more gas in the current rise. |
| Session Leader Comments | |||
| Feb 22 1996 10:58:35:640AM | Yuichi Takase | MP117 7.9T D(He3)
SL: Takase PO: Snipes EO: Silva/Bertolino/Daigle Plan: Clean-up shots at 5.3T until H-mode improves 7.9T, 1.2MA heating (try to evaluate absorption again) Try PEP mode (Li/D2 pellets) EF1 problem has gone away for the moment, but not really fixed. | |
| Feb 22 1996 11:00:23:800AM | 960222006 | Yuichi Takase | Shot 006: plasma
fiducial no D-port (crowbarred before the shot) |
| Feb 22 1996 11:15:17:180AM | 960222007 | Yuichi Takase | Shot 007: dud
loaded 960214027 Ef1 problem is back! |
| Feb 22 1996 11:28:23:490AM | 960222008 | Yuichi Takase | Shot 008: dud
same, EF1 problem |
| Feb 22 1996 12:52:21:310PM | 960222009 | Yuichi Takase | Shot 009: plasma
good H-mode, 2.55MW, 200kJ, H=2.5 |
| Physics Operator Comments | |||
| Feb 22 1996 11:21:19:470AM | Joseph Snipes | Attempt to run MP 117 ICRF H-modes at 7.9 T D(He3)
Engineer in charge: Frank Silva Physicist in charge: Joseph Snipes Session leader: Yuichi Takase Li pellets (PEP) modes, attempt to measure RF power absorption with the diamagnetic stored energies compared to fast EFIT stored energies. Attempt full performance plasmas at 1.2 MA and 7.9 T with all available RF power. | |
| Feb 22 1996 11:21:45:840AM | 960222001 | Joseph Snipes | Shot 1 :EF1L test. Failed like yesterday.
|
| Feb 22 1996 11:22:14:290AM | 960222002 | Joseph Snipes | Shot 2 :Repeat. EF1L worked fine.
|
| Feb 22 1996 11:22:30:020AM | 960222003 | Joseph Snipes | Shot 3 :Reversed polarity. Worked O.K. but had 200 V glitches.
|
| Feb 22 1996 11:22:52:520AM | 960222004 | Joseph Snipes | Shot 4 :Repeat at higher voltage.
|
| Feb 22 1996 11:24:18:850AM | 960222005 | Joseph Snipes | Shot 5 :Another EF1L test. Looks O.K.
|
| Feb 22 1996 11:25:14:070AM | 960222006 | Joseph Snipes | Shot 6 :Start with a fiducial copied from shot 960213011 but with Br offset
changed from 7.4 mT to 5.4 mT. Good shot. H-modes from 0.76 to 1.02 sec. |
| Feb 22 1996 11:26:09:110AM | 960222007 | Joseph Snipes | Shot 7 :Copied shot 960214027 but changed Br offset to 5.4 mT. Ip = 1 MA,
Bt = 5.3 T, nl04 ramping from 8 x 10^19 m^-2 to 1 x 10^20 m^-2 from 0.65 to 0.87 sec. EF1L failed. No plasma. |
| Feb 22 1996 11:27:04:070AM | 960222008 | Joseph Snipes | Shot 8 :Repeat. EF1L failed again.
|
| Feb 22 1996 12:04:48:440PM | 960222009 | Joseph Snipes | Shot 9 :Repeat. Good shot. H-modes from 0.63 to 1.1 sec. Reached nearly
200 kJ of stored energy. |
| Feb 22 1996 02:07:24:320PM | 960222009 | Joseph Snipes | After shot 960222009, the PF breaker failed. So, there were no
further plasmas today. The rest of the day will be devoted to swapping out one of the TF breakers to replace the broken PF breaker and do power supply testing. |
| Feb 22 1996 03:53:03:050PM | 960222020 | Joseph Snipes | Shot 20:Copied shot 960118032. Changed TF to no hybrid control with a set
point at 100 kA, which should be about 3.5 T. Set Br offset to 5.4 mT. Ip = 580 kA, nl04 set to 5 x 10^19 m^-2. Dud. |
| Feb 22 1996 03:53:40:120PM | 960222021 | Joseph Snipes | Shot 21:Changed EF1U and L currents before t=0 from -4800 to -5000 A.
Dud. |
| Feb 22 1996 04:36:41:450PM | 960222022 | Joseph Snipes | Shot 22:Increased pre-puff by 3 msec to 14 msec flattop. Reduced Br by
another 0.4 mT to 5.0 mT. OH2 changed from -22200 to -23200 A. EF1U and L returned to -4800 A. Dud. |
| Feb 22 1996 04:36:59:400PM | 960222023 | Joseph Snipes | Shot 23:Set Br offset to 4 mT, increased pre-puff by 2 msec to 16 msec.
|
| Feb 22 1996 04:37:15:720PM | 960222024 | Joseph Snipes | Shot 24:Increased pre-puff by 9 msec to 25 msec. Changed EF4 current from
-1150 to -1200 A. Got breakdown. |
| Feb 22 1996 04:52:35:840PM | 960222025 | Joseph Snipes | Shot 25:Increased Br offset by 0.5 mT to 4.5 mT. Reduced pre-puff by 5
msec to 20 msec. Got plasma. Disrupted at 0.55 sec. Ran limited on the outboard limiter. |
| Feb 22 1996 04:58:08:780PM | 960222026 | Joseph Snipes | Shot 26:Reduced RCUR from 0.675 to 0.669 m during the flattop.
Fizzle. |
| Feb 22 1996 05:19:07:370PM | 960222027 | Joseph Snipes | Shot 27:One more time. Disrupted at 0.185 sec. Probably needs more gas in
the current rise. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:06:41:660AM | Test | Bad | ef1 lower test ioc, comm fault |
| 2 | 09:21:29:160AM | Test | Ok | no faults ef1 test |
| 3 | 09:27:33:440AM | Test | Ok | |
| 4 | 09:46:11:670AM | Test | Ok | |
| 5 | 10:15:07:270AM | Test | Ok | |
| 6 | 10:50:48:420AM | Plasma | Ok | |
| 7 | 11:10:19:250AM | Plasma | Bad | ef1l ioc, comm fault |
| 8 | 11:21:53:740AM | Plasma | Bad | ef1 faults |
| 9 | 11:49:42:450AM | Plasma | Ok | |
| 10 | 12:47:42:420PM | Test | Ok | |
| 11 | 12:59:54:640PM | Test | Ok | |
| 12 | 01:18:56:280PM | Test | Ok | |
| 13 | 02:09:09:010PM | Test | Ok | |
| 14 | 02:16:46:690PM | Test | Ok | |
| 15 | 02:21:54:830PM | Test | Ok | |
| 16 | 02:26:05:800PM | Test | Ok | |
| 17 | 02:29:59:770PM | Test | Ok | ef1 test |
| 18 | 02:51:43:450PM | Test | Ok | |
| 19 | 02:58:08:100PM | Test | Ok | |
| 20 | 03:36:20:180PM | Plasma | Ok | |
| 21 | 03:49:56:570PM | Plasma | Ok | |
| 22 | 04:06:52:900PM | Plasma | Ok | |
| 23 | 04:16:31:400PM | Plasma | Ok | |
| 24 | 04:26:39:870PM | Plasma | Ok | |
| 25 | 04:36:15:650PM | Plasma | Ok | |
| 26 | 04:51:17:050PM | Plasma | Ok | |
| 27 | 05:01:38:040PM | Plasma | Ok | |