| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Robert Granetz |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Bill Cochran,Frank Silva,Vinny Bertolino |
| Engineering Operator Run Comment |
| mp175/Terry/Cochran/Bertolino/Granetz/setup as for 970624038 |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:17:007PM |
| Author: To Be Determined |
| Physics operator summary for run 970625 MP 158, Fast disruption termination using massive D2 pellet injection SL: Granetz PO: Granetz EO: Silva, Cochran, Bertolino Summary: A very successful run. We conclusively showed that massive D2 pellet injection does NOT speed up the current quench at all, nor does it reduce the halo current. The pellets typically raised the plasma density momentarily to nebar=1.6e21 m-3 (about 3 times the Greenwald limit), and lowered Te to 100-200 eV in the outer portion of the plasma, but the current quench timescale was about 5 ms, which is the typical value. The same result was obtained when we tried to kill a VDE (shot 20). Simultaneous injection of D2 pellets and tungsten (from the laser blowoff) did not do any better. We were able to kill OH, L-mode, ELMy H-mode, and ELM-free H-modes, with identical results. See shots 11, 13, 14, 16, 17, and 20. MP #158 has been completed. Some progress was also made with the RF, but there are still a lot of problems. Shot 16 had 2.2 MW. Problems today: the TCI laser had some problems today, resulting in loss of density feedback, and probably leading to some unexpected disruptions. To get around this, we turned off the hybrid feedback and pasted in an actual valve voltage trace from a good shot into the pre-programmed voltage. ******* WARNING: IF YOU USE ONE OF TODAY'S SHOTS (AFTER 009) FOR FUTURE SETUP'S, REMEMBER THAT THE DENSITY FEEDBACK IS TURNED OFF! ******* WARNING: IF YOU USE ONE OF TODAY'S SHOTS (AFTER 018) FOR FUTURE SETUP'S, REMEMBER THAT THE ZCUR FEEDBACK IS TURNED OFF AFTER T=1.10 SECONDS! There was a unexplained fault with TF cabinet #1 (shot 020) which caused a lot of unusual noise in the power room, and a lot of electrical noise on the TF current. No problems were found in the cabinet, however, and subsequent shots were fine. Scorecard: 14 plasmas 4 fizzles 2 duds (1 magnetic resistance fault, 1 gas system problem) 2 tests ---------- 22 total ------------------------------------------------------------------------------ Run Plan for Wednesday, 970625: MP 158 -- Fast disruption termination using massive D2 pellet injection. Engineering setup for Wednesday 25 June 1997: ** Please note: ** After the most recent plasma run (Tues), a series of shot cycles was run for gas calibration purposes. Please be sure to have all necessary trees turned back on again for the beginning of this run. Overnight ECDC in deuterium. Engineering setup as on 970624035, with TF under hybrid control Plasma current to be set for 0.8 MA instead of 1.0 MA. Density to be set for nl_04=1.0e20 m-2. Segment 1 startup will be copied from 970624035. Gas setup - fill K-side with 20 PSI of D2, hybrid enable fill B-top with 6 PSI of D2, hybrid enable fill B-side-lower with 4 PSI of Ar, hybrid enable fill J-bottom with 4 PSI of Ne, DO NOT ENABLE The following gate valves should be enabled, assuming no vacuum problems: ECE and PI only! (not PCX, not TCX, not VUV) The IG1 and IG2 turbopump gauges should be turned off. The ratiomatic gauge should be turned off and its auto reset turned off. ------------------------------------------------------------------------------- Detailed shot log: Hybrid coldstart done; no problems. Reload plasma shot from late yesterday (970624035), B=5.3 tesla Reduce plasma current to 0.8 MA. Reduce nl_04 to 1.0e20 m-2. Because of an overnight fault in the pellet injector system, the pellet injector will require 1.5 hours to recool. RF will make use of the first part of the run. Shot 01 -- Test of TF scanner. Shot 02 -- Plasma, but no EFC, resulting in a disruption at 0.19 s. There was also a PF crowbar. Next shot: repeat with no changes, except try a 50 ms puff of neon from J-bottom valve. Shot 03 -- Plasma. Good shot. Prf=1 MW. A couple of ELMy H-modes. No neon. The feedback signal for the antenna gap is now getting to the hybrid (that's one problem fixed), but it is not correct. We are having a break now to allow RF access to the cell. Next shot: repeat with no changes, except this time enable the J-bottom PLC bit (oops, operator error). Shot 04 -- Plasma. Good shot. Got two good ELM-free H-modes. Neon got in. Next shot: repeat. Shot 05 -- Plasma. Good shot. Disrupted at 1.22 s. Prf>1 MW. Two more ELM-free H-modes. Next shot: pellet injection, all barrels enabled. Pellets should hit plasma at t=1.170 s (600 microseconds prior to YAG pulse). Turn off IGP1, IGP2, F-ratiomatic. Turn on PI gate valve. Turn off and bypass IGT. Setup fast windows starting at t=1.150 s. Also turn on impurity injector to fire silicon at t=0.5 s. ** Start pellet injection next shot ** Shot 06 -- Plasma. Disrupted at t=1.00 s, which is well before the pellets were fired. Pellet injector worked well. Some RF, but no H-modes. No density signal. It turns out that the density feedback was asking for lots of gas because of the lack of density signal. I'm blaming the disruption on that, but the YAG gives ne0=3e20 m-3 only. Next shot: try again, no changes. Shot 07 -- Fizzle. Problems with the interferometer laser again. Chalk it up to disruption recovery. Next shot: try again, no changes. Shot 08 -- Dud. Most power supplies didn't fire. Magnet resistance fault. Next shot: try again, no changes. Shot 09 -- Plasma. Disrupted at 1.03 s. No density again. Jim will need cell access soon. Next shot: move pellet injection to t=0.7095 s. RF will be on at that time. Also, assume there will be no density feedback signal. Copy PG3 voltage trace from shot 004 into voltage programming for segment 2, and turn off feedback gain for nl_04. Shot 10 -- Fizzle. Disruption recovery again? Next shot: try again. Shot 11 -- Plasma. Got it! Pellets were strung out over 1.5 ms, starting at t=0.7074 s. Prf=0.9 MW at the injection. Current quench was very slow, about 5 ms! I_halo_lower=120 kA (typical value). Next shot: repeat, perhaps with more RF power. Shot 12 -- Fizzle. Disruption recovery? Next shot: repeat. Shot 13 -- Plasma. Got another one! Density on this shot (and previous one) reaches nebar=1.6e21 !!!. Plasma takes a relatively long time to begin to quench, and the current quench again takes 5 ms. Typical halo currents, as well. Prf was again 1 Mw, but this shot was killed during an ELM-free H-mode. Martin reports that the pellets were less strung out than previously. Next shot: repeat, except turn off RF at 0.6 s. (It will probably be a fizzle anyway.) Shot 14 -- Plasma. Got another one. This was killed in ohmic L-mode. Same results as previous shots. We are having a break now to allow access to the cell for multiple purposes. Next shot: turn RF back on. Try firing tungsten simultaneously with the pellets. Shot 15 -- Dud. Null looks okay. All supplies fired. Steve Wolfe has found that the hybrid gas pulse did not get to the valve. Next shot: try again. RF will be going. Tungsten will be injected at t=0.708 s, along with the D2 pellets. Shot 16 -- Plasma. Another successful kill. Typical quench time, typical halo current. It doesn't look like the tungsten made it in. Good RF ... 2.2 MW! ELM-free H-modes. Next shot: try again. Move tungsten injection earlier. Increase neon puff from 50 to 60 ms. Shot 17 -- Plasma. Another successful kill. Same results. RF didn't work as well. Tungsten got in, but didn't cool the plasma enough to speed up the current quench. Next shot: change gears and try killing VDE's. Turn off the ZCUR feedback gain at t=1.10 s. Move fast windows to t=1.10 s RF will be on. Shot 18 -- Fizzle. Null is so-so. Next shot: repeat with no changes. Shot 19 -- Plasma. VDE went upwards, with plasma termination at t=1.131 s. Z-centroid from x-rays was at +0.02 m at t=1.12 s, with the pellet firing at 1.17 s. Very fast current quench (2 ms). Multiple H-modes. Next shot: delay start of VDE by 50 ms (gains turn off at t=1.150 s) Shot 20 -- Plasma. Good VDE, but there was a really wierd noise coming from the power room. There is a lot of noise on the TF current and Btor during the flattop. Apparently a current sensor in one of the TF cabinets became very noisy. Pellets hit the plasma when it was 3 cm down. Perfect timing. Still did not speed up the current quench though. Typical halo current. That completes MP 158 ! We are having a break now to allow access to the power room to work on the TF supply. Shot 21 -- PLC test of TF at 100 kA. Looks good. Next shot: normal plasma with RF. No pellets. Shot 22 -- Plasma. Good VDE, but we didn't want this to be a VDE. I forgot to turn on the ZCUR feedback for the entire shot ... operator error! End of run |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:57:850PM |
| Author: To Be Determined |
| Physics operator summary for run 970625 MP 158, Fast disruption termination using massive D2 pellet injection SL: Granetz PO: Granetz EO: Silva, Cochran, Bertolino Summary: A very successful run. We conclusively showed that massive D2 pellet injection does NOT speed up the current quench at all, nor does it reduce the halo current. The pellets typically raised the plasma density momentarily to nebar=1.6e21 m-3 (about 3 times the Greenwald limit), and lowered Te to 100-200 eV in the outer portion of the plasma, but the current quench timescale was about 5 ms, which is the typical value. The same result was obtained when we tried to kill a VDE (shot 20). Simultaneous injection of D2 pellets and tungsten (from the laser blowoff) did not do any better. We were able to kill OH, L-mode, ELMy H-mode, and ELM-free H-modes, with identical results. See shots 11, 13, 14, 16, 17, and 20. MP #158 has been completed. Some progress was also made with the RF, but there are still a lot of problems. Shot 16 had 2.2 MW. Problems today: the TCI laser had some problems today, resulting in loss of density feedback, and probably leading to some unexpected disruptions. To get around this, we turned off the hybrid feedback and pasted in an actual valve voltage trace from a good shot into the pre-programmed voltage. ******* WARNING: IF YOU USE ONE OF TODAY'S SHOTS (AFTER 009) FOR FUTURE SETUP'S, REMEMBER THAT THE DENSITY FEEDBACK IS TURNED OFF! ******* WARNING: IF YOU USE ONE OF TODAY'S SHOTS (AFTER 018) FOR FUTURE SETUP'S, REMEMBER THAT THE ZCUR FEEDBACK IS TURNED OFF AFTER T=1.10 SECONDS! There was a unexplained fault with TF cabinet #1 (shot 020) which caused a lot of unusual noise in the power room, and a lot of electrical noise on the TF current. No problems were found in the cabinet, however, and subsequent shots were fine. Scorecard: 14 plasmas 4 fizzles 2 duds (1 magnetic resistance fault, 1 gas system problem) 2 tests ---------- 22 total ------------------------------------------------------------------------------ Run Plan for Wednesday, 970625: MP 158 -- Fast disruption termination using massive D2 pellet injection. Engineering setup for Wednesday 25 June 1997: ** Please note: ** After the most recent plasma run (Tues), a series of shot cycles was run for gas calibration purposes. Please be sure to have all necessary trees turned back on again for the beginning of this run. Overnight ECDC in deuterium. Engineering setup as on 970624035, with TF under hybrid control Plasma current to be set for 0.8 MA instead of 1.0 MA. Density to be set for nl_04=1.0e20 m-2. Segment 1 startup will be copied from 970624035. Gas setup - fill K-side with 20 PSI of D2, hybrid enable fill B-top with 6 PSI of D2, hybrid enable fill B-side-lower with 4 PSI of Ar, hybrid enable fill J-bottom with 4 PSI of Ne, DO NOT ENABLE The following gate valves should be enabled, assuming no vacuum problems: ECE and PI only! (not PCX, not TCX, not VUV) The IG1 and IG2 turbopump gauges should be turned off. The ratiomatic gauge should be turned off and its auto reset turned off. ------------------------------------------------------------------------------- Detailed shot log: Hybrid coldstart done; no problems. Reload plasma shot from late yesterday (970624035), B=5.3 tesla Reduce plasma current to 0.8 MA. Reduce nl_04 to 1.0e20 m-2. Because of an overnight fault in the pellet injector system, the pellet injector will require 1.5 hours to recool. RF will make use of the first part of the run. Shot 01 -- Test of TF scanner. Shot 02 -- Plasma, but no EFC, resulting in a disruption at 0.19 s. There was also a PF crowbar. Next shot: repeat with no changes, except try a 50 ms puff of neon from J-bottom valve. Shot 03 -- Plasma. Good shot. Prf=1 MW. A couple of ELMy H-modes. No neon. The feedback signal for the antenna gap is now getting to the hybrid (that's one problem fixed), but it is not correct. We are having a break now to allow RF access to the cell. Next shot: repeat with no changes, except this time enable the J-bottom PLC bit (oops, operator error). Shot 04 -- Plasma. Good shot. Got two good ELM-free H-modes. Neon got in. Next shot: repeat. Shot 05 -- Plasma. Good shot. Disrupted at 1.22 s. Prf>1 MW. Two more ELM-free H-modes. Next shot: pellet injection, all barrels enabled. Pellets should hit plasma at t=1.170 s (600 microseconds prior to YAG pulse). Turn off IGP1, IGP2, F-ratiomatic. Turn on PI gate valve. Turn off and bypass IGT. Setup fast windows starting at t=1.150 s. Also turn on impurity injector to fire silicon at t=0.5 s. ** Start pellet injection next shot ** Shot 06 -- Plasma. Disrupted at t=1.00 s, which is well before the pellets were fired. Pellet injector worked well. Some RF, but no H-modes. No density signal. It turns out that the density feedback was asking for lots of gas because of the lack of density signal. I'm blaming the disruption on that, but the YAG gives ne0=3e20 m-3 only. Next shot: try again, no changes. Shot 07 -- Fizzle. Problems with the interferometer laser again. Chalk it up to disruption recovery. Next shot: try again, no changes. Shot 08 -- Dud. Most power supplies didn't fire. Magnet resistance fault. Next shot: try again, no changes. Shot 09 -- Plasma. Disrupted at 1.03 s. No density again. Jim will need cell access soon. Next shot: move pellet injection to t=0.7095 s. RF will be on at that time. Also, assume there will be no density feedback signal. Copy PG3 voltage trace from shot 004 into voltage programming for segment 2, and turn off feedback gain for nl_04. Shot 10 -- Fizzle. Disruption recovery again? Next shot: try again. Shot 11 -- Plasma. Got it! Pellets were strung out over 1.5 ms, starting at t=0.7074 s. Prf=0.9 MW at the injection. Current quench was very slow, about 5 ms! I_halo_lower=120 kA (typical value). Next shot: repeat, perhaps with more RF power. Shot 12 -- Fizzle. Disruption recovery? Next shot: repeat. Shot 13 -- Plasma. Got another one! Density on this shot (and previous one) reaches nebar=1.6e21 !!!. Plasma takes a relatively long time to begin to quench, and the current quench again takes 5 ms. Typical halo currents, as well. Prf was again 1 Mw, but this shot was killed during an ELM-free H-mode. Martin reports that the pellets were less strung out than previously. Next shot: repeat, except turn off RF at 0.6 s. (It will probably be a fizzle anyway.) Shot 14 -- Plasma. Got another one. This was killed in ohmic L-mode. Same results as previous shots. We are having a break now to allow access to the cell for multiple purposes. Next shot: turn RF back on. Try firing tungsten simultaneously with the pellets. Shot 15 -- Dud. Null looks okay. All supplies fired. Steve Wolfe has found that the hybrid gas pulse did not get to the valve. Next shot: try again. RF will be going. Tungsten will be injected at t=0.708 s, along with the D2 pellets. Shot 16 -- Plasma. Another successful kill. Typical quench time, typical halo current. It doesn't look like the tungsten made it in. Good RF ... 2.2 MW! ELM-free H-modes. Next shot: try again. Move tungsten injection earlier. Increase neon puff from 50 to 60 ms. Shot 17 -- Plasma. Another successful kill. Same results. RF didn't work as well. Tungsten got in, but didn't cool the plasma enough to speed up the current quench. Next shot: change gears and try killing VDE's. Turn off the ZCUR feedback gain at t=1.10 s. Move fast windows to t=1.10 s RF will be on. Shot 18 -- Fizzle. Null is so-so. Next shot: repeat with no changes. Shot 19 -- Plasma. VDE went upwards, with plasma termination at t=1.131 s. Z-centroid from x-rays was at +0.02 m at t=1.12 s, with the pellet firing at 1.17 s. Very fast current quench (2 ms). Multiple H-modes. Next shot: delay start of VDE by 50 ms (gains turn off at t=1.150 s) Shot 20 -- Plasma. Good VDE, but there was a really wierd noise coming from the power room. There is a lot of noise on the TF current and Btor during the flattop. Apparently a current sensor in one of the TF cabinets became very noisy. Pellets hit the plasma when it was 3 cm down. Perfect timing. Still did not speed up the current quench though. Typical halo current. That completes MP 158 ! We are having a break now to allow access to the power room to work on the TF supply. Shot 21 -- PLC test of TF at 100 kA. Looks good. Next shot: normal plasma with RF. No pellets. Shot 22 -- Plasma. Good VDE, but we didn't want this to be a VDE. I forgot to turn on the ZCUR feedback for the entire shot ... operator error! End of run |
| Session Leader Comments |
| Physics Operator Comments | |||
| Jun 25 1997 08:54:59:470AM | Robert Granetz | Run Plan for Wednesday, 970625: MP 158 -- Fast disruption termination using massive D2 pellet injection. Engineering setup for Wednesday 25 June 1997: ** Please note: ** After the most recent plasma run (Tues), a series of shot cycles was run for gas calibration purposes. Please be sure to have all necessary trees turned back on again for the beginning of this run. Overnight ECDC in deuterium. Engineering setup as on 970624035, with TF under hybrid control Plasma current to be set for 0.8 MA instead of 1.0 MA. Density to be set for nl_04=1.0e20 m-2. Segment 1 startup will be copied from 970624035. Gas setup - fill K-side with 20 PSI of D2, hybrid enable fill B-top with 6 PSI of D2, hybrid enable fill B-side-lower with 4 PSI of Ar, hybrid enable fill J-bottom with 4 PSI of Ne, DO NOT ENABLE The following gate valves should be enabled, assuming no vacuum problems: ECE and PI only! (not PCX, not TCX, not VUV) The IG1 and IG2 turbopump gauges should be turned off. The ratiomatic gauge should be turned off and its auto reset turned off. | |
| Jun 25 1997 08:55:41:080AM | Robert Granetz | Hybrid coldstart done; no problems. Reload plasma shot from late yesterday (970624035), B=5.3 tesla Reduce plasma current to 0.8 MA. Reduce nl_04 to 1.0e20 m-2. Because of an overnight fault in the pellet injector system, the pellet injector will require 1.5 hours to recool. RF will make use of the first part of the run. | |
| Jun 25 1997 08:59:16:350AM | 970625001 | Robert Granetz | Shot 01 -- Test of TF scanner. |
| Jun 25 1997 09:30:53:160AM | 970625002 | Robert Granetz | Shot 02 -- Plasma, but no EFC, resulting in a disruption at 0.19 s. There was also a PF crowbar. Next shot: repeat with no changes, except try a 50 ms puff of neon from J-bottom valve. |
| Jun 25 1997 09:52:26:120AM | 970625003 | Robert Granetz | Shot 03 -- Plasma. Good shot. Prf=1 MW. A couple of ELMy H-modes. No neon. The feedback signal for the antenna gap is now getting to the hybrid (that's one problem fixed), but it is not correct. We are having a break now to allow RF access to the cell. Next shot: repeat with no changes, except this time enable the J-bottom PLC bit (oops, operator error). |
| Jun 25 1997 10:16:27:900AM | 970625004 | Robert Granetz | Shot 04 -- Plasma. Good shot. Got two good ELM-free H-modes. Neon got in. Next shot: repeat. |
| Jun 25 1997 11:19:16:730AM | 970625005 | Robert Granetz | Shot 05 -- Plasma. Good shot. Disrupted at 1.22 s. Prf>1 MW. Two more ELM-free H-modes. Next shot: pellet injection, all barrels enabled. Pellets should hit plasma at t=1.170 s (600 microseconds prior to YAG pulse). Turn off IGP1, IGP2, F-ratiomatic. Turn on PI gate valve. Turn off and bypass IGT. Setup fast windows starting at t=1.150 s. Also turn on impurity injector to fire silicon at t=0.5 s. |
| Jun 25 1997 10:53:38:140AM | 970625006 | Robert Granetz | Shot 06 -- Plasma. Disrupted at t=1.00 s, which is well before the pellets were fired. Pellet injector worked well. Some RF, but no H-modes. No density signal. It turns out that the density feedback was asking for lots of gas because of the lack of density signal. I'm blaming the disruption on that, but the YAG gives ne0=3e20 m-3 only. Next shot: try again, no changes. |
| Jun 25 1997 11:10:38:770AM | 970625007 | Robert Granetz | Shot 07 -- Fizzle. Problems with the interferometer laser again. Chalk it up to disruption recovery. Next shot: try again, no changes. |
| Jun 25 1997 11:17:55:960AM | 970625008 | Robert Granetz | Shot 08 -- Dud. Most power supplies didn't fire. Magnet resistance fault. Next shot: try again, no changes. |
| Jun 25 1997 11:36:31:620AM | 970625009 | Robert Granetz | Shot 09 -- Plasma. Disrupted at 1.03 s. No density again. Jim will need cell access soon. Next shot: move pellet injection to t=0.7095 s. RF will be on at that time. Also, assume there will be no density feedback signal. Copy PG3 voltage trace from shot 004 into voltage programming for segment 2, and turn off feedback gain for nl_04. |
| Jun 25 1997 11:43:43:280AM | 970625010 | Robert Granetz | Shot 10 -- Fizzle. Disruption recovery again? Next shot: try again. |
| Jun 25 1997 12:04:09:660PM | 970625011 | Robert Granetz | Shot 11 -- Plasma. Got it! Pellets were strung out over 1.5 ms, starting at t=0.7074 s. Prf=0.9 MW at the injection. Current quench was very slow, about 5 ms! I_halo_lower=120 kA (typical value). Next shot: repeat, perhaps with more RF power. |
| Jun 25 1997 12:15:57:030PM | 970625012 | Robert Granetz | Shot 12 -- Fizzle. Disruption recovery? Next shot: repeat. |
| Jun 25 1997 12:26:30:870PM | 970625013 | Robert Granetz | Shot 13 -- Plasma. Got another one! Density on this shot (and previous one) reaches nebar=1.6e21 !!!. Plasma takes a relatively long time to begin to quench, and the current quench again takes 5 ms. Typical halo currents, as well. Prf was again 1 Mw, but this shot was killed during an ELM-free H-mode. Martin reports that the pellets were less strung out than previously. Next shot: repeat, except turn off RF at 0.6 s. (It will probably be a fizzle anyway.) |
| Jun 25 1997 12:44:49:790PM | 970625014 | Robert Granetz | Shot 14 -- Plasma. Got another one. This was killed in ohmic L-mode. Same results as previous shots. We are having a break now to allow access to the cell for multiple purposes. Next shot: turn RF back on. Try firing molybdenum simultaneously with the pellets. |
| Jun 25 1997 01:47:14:370PM | 970625015 | Robert Granetz | Shot 15 -- Dud. Null looks okay. All supplies fired. Steve Wolfe has found that the hybrid gas pulse did not get to the valve. Next shot: try again. RF will be going. Molybdenum will be injected at t=0.708 s, along with the D2 pellets. |
| Jun 25 1997 02:05:39:680PM | 970625016 | Robert Granetz | Shot 16 -- Plasma. Another successful kill. Typical quench time, typical halo current. It doesn't look like the molybdenum made it in. Good RF ... 2.2 MW! ELM-free H-modes. Next shot: try again. Move moly injection earlier. Increase neon puff from 50 to 60 ms. |
| Jun 25 1997 02:29:55:520PM | 970625018 | Robert Granetz | Shot 18 -- Fizzle. Null is so-so. Next shot: repeat with no changes. |
| Jun 25 1997 02:52:00:230PM | 970625019 | Robert Granetz | Shot 19 -- Plasma. VDE went upwards, with plasma termination at t=1.131 s. Z-centroid from x-rays was at +0.02 m at t=1.12 s, with the pellet firing at 1.17 s. Very fast current quench (2 ms). Multiple H-modes. Next shot: delay start of VDE by 50 ms (gains turn off at t=1.150 s) |
| Jun 25 1997 03:23:23:960PM | 970625020 | Robert Granetz | Shot 20 -- Plasma. Good VDE, but there was a really wierd noise coming from the power room. There is a lot of noise on the TF current and Btor during the flattop. Apparently a current sensor in one of the TF cabinets became very noisy. Pellets hit the plasma when it was 3 cm down. Perfect timing. Still did not speed up the current quench though. Typical halo current. That completes MP 158 ! We are having a break now to allow access to the power room to work on the TF supply. |
| Jun 25 1997 04:10:50:250PM | 970625021 | Robert Granetz | Shot 21 -- PLC test of TF at 100 kA. Looks good. Next shot: normal plasma with RF. No pellets. |
| Jun 25 1997 04:16:07:300PM | 970625022 | Robert Granetz | Shot 22 -- Plasma. Good VDE, but we didn't want this to be a VDE. I forgot to turn on the ZCUR feedback for the entire shot ... operator error! |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 07:25:48:670AM | Test | Ok | TF Scanner test |
| 2 | 08:48:12:890AM | Plasma | Ok | no efc, oh2lo comm fault |
| 3 | 09:16:06:070AM | Plasma | Ok | no faults |
| 4 | 10:05:27:100AM | Plasma | Ok | no faults |
| 5 | 10:17:09:850AM | Plasma | Ok | no faults |
| 6 | 10:40:58:760AM | Plasma | Ok | no faults |
| 7 | 11:00:16:180AM | Plasma | Ok | no fault |
| 8 | 11:11:08:000AM | Plasma | Bad | efc,ef2 only worked |
| 9 | 11:19:30:050AM | Plasma | Ok | |
| 10 | 11:40:10:630AM | Plasma | Ok | |
| 11 | 11:49:08:200AM | Plasma | Ok | |
| 12 | 12:03:21:020PM | Plasma | Ok | |
| 13 | 12:12:55:940PM | Plasma | Ok | |
| 14 | 12:28:44:120PM | Plasma | Ok | |
| 15 | 01:36:18:550PM | Plasma | Ok | |
| 16 | 01:49:11:590PM | Plasma | Ok | |
| 17 | 02:06:38:040PM | Plasma | Ok | |
| 18 | 02:24:45:540PM | Plasma | Ok | |
| 19 | 02:34:25:480PM | Plasma | Ok | |
| 20 | 02:51:55:520PM | Plasma | Ok | |
| 21 | 04:01:41:990PM | Test | Ok | |
| 22 | 04:12:15:880PM | Plasma | Ok | |