| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Yuichi Takase |
| Physics operator(s): | Joseph Snipes |
| Engineering operator(s): | Vinny Bertolino |
| Engineering Operator Run Comment |
| RF Commissioning |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:14:210PM |
| Author: To Be Determined |
| Run plan for 951129: MP102 RF Conditioning + D2 pellet piggy-back Start from 951128033 (possibly with minor modification). The goal is to obtain reliable power at 1.5 MW level from each antenna. SL: Takase PO: Snipes EO: Bertolino This run was continuation of yesterday's run. The shot rep rate was very slow today (problem with TF cooling). The goal of reliable 1.5MW power from each antenna was achieved. Transmitter 1 has is operating near its power limit and has frequent crowbars. E-port has larger excursions in the reflection coefficient than D-port, and it is difficult to keep it from tripping on transitions into EML-free H-mode. The reflection trip threshold probably needs to be raised slightly. D-port can be tuned to handle both L and H-modes. In addition to achieving the primary goal: An official fiducial shot was established (shot 951129008). The RF power was programmed to be 1MW from D port (.8 - .95sec) and 1MW from E port (.85 - 1.00sec), so that there is a .1sec interval (.85 - .95) when both antennas are on. However, 951129008 had only a short duration of high power (2MW) RF because of H-mode. We had a large number of H-modes. During the course of conditioning (can also be considered to be a fine-step power scan) we have a few instances in which the H-mode threshold was barely crossed. These data can be useful. On shots 15 (high density) and 21 (low density), outer gap scans were performed, to obtain information on how much the outer gap needs to be changed in order to gain a certain amount of loading. D2 pellet was fired on shots 23 and 25. Shot 26 was an attemp to get a PEP mode, but the plasma fizzled. Shot 01 pla Repeat of 951128033, no RF 02 pla RF on D:1.2MW E:1.6MW (30 kV on both antennas) Lots of spikes on density, D_alpha, etc., nel_04=1.6 03 fiz 04 pla RF on D:1.3MW E:1.6MW, still lots of density spikes, nel_04=1.5 05 pla RF pulses separated, D:0.9MW E:1.5MW, nel_04=1.2 Density feedback now on TCI (was on Z meter) 06 fiz Trying to take a fiducial, nel_04=1.0 07 pla Fiducial, got ELM-free H-modes, also got a few Mo injections 08 pla Reduced TF to 5.3T (was 5.5T), another fiducial, H-modes 09 pla asking for nel_04=1.2, reducing outer gap by 6mm (was 16mm) got nel_04=1.1, R_gap=10mm, and H-modes, D:0.9MW E:1.5MW 10 pla add gas from B-top at 0.5sec, D:1.2MW, E:1.6MW 11 pla got H-mode with D-port, too (just above threshold), D:1.3MW, E:1.6MW 12 pla add gas from B-side-upper, D:1.3MW, E:1.7MW 13 pla add Ar from B-side-lower, asking for nel_04=1.4, D:1.5MW, E:0MW 14 pla R_gap scan (0.5 - 2cm) for E-port, D:1.6MW, E:0MW didn't get R_gap scan 15 pla more Ar, larger R_gap swing, got R_gap scan (0.5 - 3cm) disrupted after 1sec, D:1.6MW, E:0MW 16 fiz 17 dud 18 pla no R_gap scan, D:1.5MW, E:1.5MW 19 pla early disruption 20 pla Good shot, Mo injection @ .86sec, D:1.6MW, E:1.7MW 21 pla nel_04=1.2, R_gap scan 22 fiz reload shot 20, D and E on at the same time, D2 pellet at .65sec 23 pla D2 (#2) pellet @ .65sec, RF @ .7sec, E-port tripped on H-modes 24 fiz 25 pla D2 pellet @ .67sec, E-port still tripping on H-modes 26 fiz trying for larger (#3) D2 pellet @ .68sec, sharper RF turn-on |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:55:457PM |
| Author: To Be Determined |
| Run 951129 RF Commissioning Engineer in Charge: Vince Bertolino Physicist in Charge: Joseph Snipes Session Leader: Yuichi Takase Goal: To bring up both RF transmitters to 1.5 MW launched into the plasma for reliable plasma operation. Start with shot 951128033 at 0.8 MA, 5.3 T. Results: The run went rather well. Both antennas produced 1.5 MW and for some periods, even together for more than 3 MW. Both ELMy and ELM-free H-modes were produced with taue up to 75 msec, though the H factor still did not exceed 1.5 (see shot 951129010). Deuterium pellets were injected into a couple of discharges before the ICRF (shots 23 and 25). I noted that extra gas was injected into the torus when the deuterium pellet injector gate valve was open at about -1.6 sec, which increased the pressure at breakdown from 0.05 mTorr to about 0.06 mTorr. This may have contributed to the fizzles on shots 22, 24, and 26, but it may have also been because the CII levels were higher on those shots. There were some problems with cooling that led to 1/2 hour shot cycles for some of the run. There was also one mysterious power supply failure on shot 17 caused by an apparent magnetic resistance fault that disappeared for the next shot. There were also a number of CAMAC problems that led to lost data for some diagnostics and made it necessary to try to recover data before the next shot. Otherwise, the systems ran reasonably well. Good run. Scorecard: 26 shots, 19 plasmas, 6 fizzles, 1 power supply failure Shot 1 : Start with shot 951128033 at 0.8 MA, 5.3 T. Good shot. Disrupted at 1.2 sec. Shot 2 : Moved CLEARIN ramp down time from 1.05 to 1.0 sec and increased the rate of the ramp into the inner wall during rampdown. Turned off the gas at 0.9 sec. O.K. Shot. Large oscillations on the H alpha and electron density. Shot 3 : Fizzle. Shot 4 : Repeat. O.K. shot. Large oscillations in H alpha. Shot 5 : Changed wire 14 to NL_04 density feedback. Requested 1.4 x 10^20 m^-2. O.K. shot. Disrupted at 1.2 sec. Shot 6 : Fiducial shot. nl04 requested at 1.0 x 10^20 m^-2. RF moved to 0.8 sec. Fizzle! Shot 7 : Repeat. Fiducial with Moly injection at 0.777 sec, H-modes from 0.86 - 1.01 sec. Shot 8 : Another fiducial. TF current set to 151 kA from 156 kA to get down to 5.3 T. Good fiducial shot. ICRF H-modes from 0.86 - 1.01 sec. Shot 9 : Raising nl04 to 1.2 x 10^20 m^-2. Increased RCUR by 3 mm to 0.669 m to reduce the outer gap for RF coupling. Good shot. H-modes from 0.85 - 1.01 sec. Shot 10: Added B top gas puff from 0.498 to 0.52 at 100 V, then 50 V until 0.7 sec. Good shot. ELMy H-mode from 0.78 - 0.8 sec, then ELMy and ELM-free H-modes from 0.85 - 1.01 sec. Shot 11: B top gas puff from 0.4 to 0.7 at 100 V. Good shot. ICRF H-modes from 0.7 - 1.0 sec. Shot 12: Late B top gas puff turned off. B side upper gas valve filled with D to 20 psi. B side puff at 100 V from 0.4 to 0.5 sec and at 50 V from 0.5 to 0.7 sec. Good shot. ICRF H-modes from 0.68 - 1.0 sec. Shot 13: B side puff at 100 V from 0.4 to 0.7 sec. nl04 request set to 1.4 x 10^20 m^-2. Ar puff from 0.28 - 0.3 sec. Disrupted at 1.16 sec. Short ELMy H-mode from 0.63 - 0.69 sec. Shot 14: Changed RCUR programming to reduce outer gap to 5 mm between 0.7 and 0.8 sec, then increase the outer gap to 2 cm at 0.95 sec. ELMy H-mode 0.64 - 0.74 sec. Shot 15: Ar puff increased to 40 msec duration. RCUR changes doubled since the gap scan did not work. Disrupted at 1 sec. Shot 16: Ar puff reduced to 30 msec duration. RCUR programmed flat at 0.669 m. Fizzle! Shot 17: Magnet resistance fault. No TF. Shot 18: Repeat. Decent shot. Disrupted at 1.16 sec. Shot 19: Repeat. Lousy shot. Disrupted at 0.43 sec. Looks like a moly brick. Shot 20: Repeat. Decent shot. Disrupted at 1.13 sec. Shot 21: Reduced density to 1.2 x 10^20 m^-2. Disabled B side upper D gas. Returned to RCUR programming from shot 15 but moved RCUR out 5 mm at 1 sec. Good shot. Disrupted at 1.22 sec. Shot 22: Return to shot 20. Reduce RCUR and CLEARIN in the rampdown to try to prevent disruptions. Fizzle! Gas puff at -1.6 sec caused breakdown conditions to be wrong. I suspect the deuterium pellet injector may have let some gas into the torus. Shot 23: Repeat. Good shot. Disrupted at 1.2 sec. D pellet at 0.65 sec. H-modes from 0.74 - 0.91 sec. ICRF power up above 3 MW. Shot 24: Repeat. Fizzle! Again, there is a gas puff at -1.6 sec that increases the pressure at breakdown. However, the CII level was also higher, so that may be why the plasma fizzled. Shot 25: Repeat. D pellet requested at 0.69 sec. Good shot. H-modes from 0.75 to 0.92 sec. Shot 26: Repeat. D pellet requested at 0.68 sec. Fizzle! |
| Session Leader Comments | |||
| Nov 29 1995 10:27:31:090AM | Yuichi Takase | Run plan for 951129:
MP102 RF Conditioning + D2 pellet piggy-back Start from 951128033 (possibly with minor modification). The goal is to obtain reliable power at 1.5 MW level from each antenna. | |
| Nov 29 1995 10:28:27:090AM | 951129001 | Yuichi Takase | Shot 01 plasma
Repeat of 951128033, no RF |
| Nov 29 1995 10:28:56:900AM | 951129002 | Yuichi Takase | Shot 01 plasma
RF on D:1.2MW E:1.6MW (30 kV on both antennas) Lots of spikes on density, D_alpha, etc., nel_04=1.6 |
| Nov 29 1995 10:29:15:190AM | 951129002 | Yuichi Takase | Shot 02 plasma
RF on D:1.2MW E:1.6MW (30 kV on both antennas) Lots of spikes on density, D_alpha, etc., nel_04=1.6 |
| Nov 29 1995 10:29:33:250AM | 951129003 | Yuichi Takase | Shot 03 fizzle
|
| Nov 29 1995 10:30:20:200AM | 951129004 | Yuichi Takase | Shot 04 plasma
RF on D:1.3MW E:1.6MW, still lots of density spikes, nel_04=1.5 |
| Nov 29 1995 10:30:47:580AM | 951129005 | Yuichi Takase | Shot 05 plasma
RF pulses separated, D:0.9MW E:1.5MW, nel_04=1.2 |
| Nov 29 1995 10:31:15:430AM | 951129006 | Yuichi Takase | Shot 06 fizzle
|
| Nov 29 1995 11:10:02:360AM | 951129007 | Yuichi Takase | Shot 07 plasma
Fiducial, got ELM-free H-modes, also got a few Mo injections |
| Nov 29 1995 11:12:40:550AM | 951129008 | Yuichi Takase | Shot 08 plasma
Another fiducial, got H-modes again (no ratiomatic data on this shot) |
| Nov 29 1995 12:41:25:970PM | 951129009 | Yuichi Takase | Shot 09 plasma
asking for nel_04=1.2, reducing outer gap by 6mm (was 16mm) got nel_04=1.1, R_gap=10mm, and H-modes, D:0.9MW E:1.5MW |
| Nov 29 1995 12:41:44:350PM | 951129010 | Yuichi Takase | Shot 10 plasma
add gas from B-top at 0.5sec, D:1.2MW, E:1.6MW |
| Nov 29 1995 12:42:02:830PM | 951129011 | Yuichi Takase | Shot 11 plasma
got H-mode with D-port, too (just above threshold), D:1.3MW, E:1.6MW |
| Nov 29 1995 12:42:19:730PM | 951129012 | Yuichi Takase | Shot 12 plasma
add gas from B-side-upper, D:1.3MW, E:1.7MW |
| Nov 29 1995 03:06:42:610PM | 951129013 | Yuichi Takase | Shot 13 plasma
add Ar from B-side-lower, asking for nel_04=1.4, D:1.5MW, E:0MW |
| Nov 29 1995 03:07:09:630PM | 951129014 | Yuichi Takase | Shot 14 plasma
R_gap scan (0.5 - 2cm) for E-port, D:1.6MW, E:0MW didn't get R_gap scan |
| Nov 29 1995 03:07:31:880PM | 951129015 | Yuichi Takase | Shot 15 plasma
more Ar, larger R_gap swing, got R_gap scan (0.5 - 3cm) disrupted after 1sec, D:1.6MW, E:0MW |
| Nov 29 1995 03:07:44:970PM | 951129016 | Yuichi Takase | Shot 15 fizzle
|
| Nov 29 1995 03:07:53:250PM | 951129016 | Yuichi Takase | Shot 16 fizzle
|
| Nov 29 1995 03:08:08:630PM | 951129017 | Yuichi Takase | Shot 17 dud (power supply)
|
| Nov 29 1995 03:08:36:780PM | 951129018 | Yuichi Takase | Shot 18 plasma
no R_gap scan, D:1.5MW, E:1.5MW |
| Nov 29 1995 03:08:57:110PM | 951129019 | Yuichi Takase | Shot 19 plasma
early disruption |
| Nov 29 1995 04:11:18:370PM | 951129020 | Yuichi Takase | Shot 20 plasma
Good shot, Mo injection @ .86sec, D:1.6MW, E:1.7MW |
| Nov 29 1995 04:11:41:890PM | 951129021 | Yuichi Takase | Shot 21 plasma
nel_04=1.2, R_gap scan |
| Nov 29 1995 04:12:25:520PM | 951129022 | Yuichi Takase | Shot 22 fizzle
reload shot 20, D and E on at the same time, D2 pellet at .65sec |
| Nov 29 1995 04:31:55:910PM | 951129023 | Yuichi Takase | Shot 23 plasma
Li pellet @ .65sec, RF .7 - .9sec, E-port tripped on H-modes |
| Nov 29 1995 04:55:06:900PM | 951129023 | Yuichi Takase | Shot 23 plasma
D2 pellet @ .65sec, RF @ .7sec, E-port tripped on H-modes |
| Nov 29 1995 04:35:02:430PM | 951129024 | Yuichi Takase | Shot 24 fizzle
|
| Nov 29 1995 04:55:24:750PM | 951129025 | Yuichi Takase | Shot 25 plasma
D2 pellet @ .67sec, E-port still tripping on H-modes |
| Nov 29 1995 05:03:43:550PM | 951129026 | Yuichi Takase | Shot 26 fizzle
trying for larger (#3) D2 pellet @ .68sec, sharper RF turn-on |
| Physics Operator Comments | |||
| Nov 29 1995 09:05:36:360AM | Joseph Snipes | Run 951129 RF Commissioning
Engineer in Charge: Vince Bertolino Physicist in Charge: Joseph Snipes Session Leader: Yuichi Takase Goal: To bring up both RF transmitters to 1.5 MW launched into the plasma for reliable plasma operation. Start with shot 951128033 at 0.8 MA, 5.3 T. | |
| Nov 29 1995 09:06:33:670AM | 951129001 | Joseph Snipes | Start with shot 951128033 at 0.8 MA, 5.3 T. Good shot. Disrupted at 1.2 sec.
|
| Nov 29 1995 09:31:51:090AM | 951129002 | Joseph Snipes | Shot 2
Moved CLEARIN ramp down time from 1.05 to 1.0 sec and increased the rate of the ramp into the inner wall during rampdown. Turned off the gas at 0.9 sec. O.K. Shot. Large oscillations on the H alpha and electron density. |
| Nov 29 1995 09:32:30:490AM | 951129003 | Joseph Snipes | Shot 3
Fizzle. |
| Nov 29 1995 09:45:37:430AM | 951129004 | Joseph Snipes | Shot 4
Repeat. O.K. shot. Large oscillations in H alpha. |
| Nov 29 1995 10:10:53:150AM | 951129005 | Joseph Snipes | Shot 5
Changed wire 14 to NL_04 density feedback. Requested 1.4 x 10^20 m^-2. O.K. shot. Disrupted at 1.2 sec. |
| Nov 29 1995 10:23:52:830AM | 951129006 | Joseph Snipes | Shot 6
Fiducial shot. nl04 requested at 1.0 x 10^20 m^-2. RF moved to 0.8 sec. Fizzle! |
| Nov 29 1995 10:38:47:690AM | 951129007 | Joseph Snipes | Shot 7
Repeat. Fiducial with Moly injection at 0.777 sec, H-modes from 0.86 - 1.01 sec. |
| Nov 29 1995 10:56:31:710AM | 951129008 | Joseph Snipes | Shot 8
Another fiducial. TF current set to 151 kA from 156 kA to get down to 5.3 T. Good fiducial shot. ICRF H-modes from 0.86 - 1.01 sec. |
| Nov 29 1995 11:19:31:500AM | 951129009 | Joseph Snipes | Shot 9
Raising nl04 to 1.2 x 10^20 m^-2. Increased RCUR by 3 mm to 0.669 m to reduce the outer gap for RF coupling. Good shot. |
| Nov 29 1995 11:33:57:400AM | 951129009 | Joseph Snipes | Shot 9
Raising nl04 to 1.2 x 10^20 m^-2. Increased RCUR by 3 mm to 0.669 m to reduce the outer gap for RF coupling. Good shot. H-modes from 0.85 - 1.01 sec. |
| Nov 29 1995 11:49:31:110AM | 951129010 | Joseph Snipes | Shot 10
Added B top gas puff from 0.498 to 0.52 at 100 V, then 50 V until 0.7 sec. Good shot. ELMy H-mode from 0.78 - 0.8 sec, then ELMy and ELM-free H-modes from 0.85 - 1.01 sec. |
| Nov 29 1995 12:08:24:320PM | 951129011 | Joseph Snipes | Shot 11
B top gas puff from 0.4 to 0.7 at 100 V. Good shot. ICRF H-modes from 0.7 - 1.0 sec. |
| Nov 29 1995 12:34:32:550PM | 951129012 | Joseph Snipes | Shot 12
Late B top gas puff turned off. B side upper gas valve filled with D to 20 psi. B side puff at 100 V from 0.4 to 0.5 sec and at 50 V from 0.5 to 0.7 sec. Good shot. ICRF H-modes from 0.68 - 1.0 sec. |
| Nov 29 1995 01:04:55:890PM | 951129013 | Joseph Snipes | Shot 13
B side puff at 100 V from 0.4 to 0.7 sec. nl04 request set to 1.4 x 10^20 m^-2. Ar puff from 0.28 - 0.3 sec. Disrupted at 1.16 sec. Short ELMy H-mode from 0.63 - 0.69 sec. |
| Nov 29 1995 01:44:10:260PM | 951129014 | Joseph Snipes | Shot 14
Changed RCUR programming to reduce outer gap to 5 mm between 0.7 and 0.8 sec, then increase the outer gap to 2 cm at 0.95 sec. ELMy H-mode 0.64 - 0.74 sec. |
| Nov 29 1995 02:28:46:210PM | 951129015 | Joseph Snipes | Shot 15
Ar puff increased to 40 msec duration. RCUR changes doubled since the gap scan did not work. Disrupted at 1.0 sec. |
| Nov 29 1995 02:29:45:260PM | 951129016 | Joseph Snipes | Shot 16
Ar puff reduced to 30 msec duration. RCUR programmed flat at 0.669 m. Fizzle! |
| Nov 29 1995 02:40:02:300PM | 951129017 | Joseph Snipes | Shot 17
Repeat. Magnet resistance fault. No TF. |
| Nov 29 1995 03:14:25:570PM | 951129018 | Joseph Snipes | Shot 18
Repeat. Decent shot. Disrupted at 1.16 sec. |
| Nov 29 1995 03:16:09:360PM | 951129019 | Joseph Snipes | Shot 19
Repeat. Lousy shot. Disrupted at 0.43 sec. Looks like a moly brick. |
| Nov 29 1995 03:25:19:440PM | 951129019 | Joseph Snipes | Shot 20
Repeat. Decent shot. Disrupted at 1.13 sec. |
| Nov 29 1995 03:25:30:900PM | 951129020 | Joseph Snipes | Shot 20
Repeat. Decent shot. Disrupted at 1.13 sec. |
| Nov 29 1995 03:39:12:370PM | 951129021 | Joseph Snipes | Shot 21
Reduced density to 1.2 x 10^20 m^-2. Disabled B side upper D gas. Returned to RCUR programming from shot 15 but moved RCUR out 5 mm at 1 sec. Good shot. Disrupted at 1.22 sec. |
| Nov 29 1995 04:13:04:150PM | 951129022 | Joseph Snipes | Shot 22
Return to shot 20. Reduce RCUR and CLEARIN in the rampdown to try to prevent disruptions. D pellet requested at 0.65 sec (size 2 = 2 x 10^20 atoms). Fizzle! Gas puff at -1.6 sec caused breakdown conditions to be wrong. I suspect the deuterium pellet injector may have let some gas into the torus. |
| Nov 29 1995 04:26:18:330PM | 951129023 | Joseph Snipes | Shot 23
Repeat. Good shot. Disrupted at 1.2 sec. D pellet at 0.65 sec. H-modes from 0.74 - 0.91 sec. ICRF power up above 3 MW. |
| Nov 29 1995 04:41:12:450PM | 951129024 | Joseph Snipes | Shot 24
Repeat. Fizzle! Again, there is a gas puff at -1.6 sec that increases the pressure at breakdown. However, the CII level was also higher, so that may be why the plasma fizzled. |
| Nov 29 1995 04:56:22:800PM | 951129025 | Joseph Snipes | Shot 25
Repeat. D pellet requested at 0.69 sec. Good shot. H-modes from 0.75 to 0.92 sec. |
| Nov 29 1995 05:15:58:220PM | 951129026 | Joseph Snipes | Shot 26
Repeat. D pellet requested at 0.68 sec. Fizzle! |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:44:16:760AM | Plasma | Ok | |
| 2 | 09:03:24:570AM | Plasma | Ok | |
| 3 | 09:20:12:300AM | Plasma | Ok | |
| 4 | 09:33:02:160AM | Plasma | Ok | |
| 5 | 09:48:55:460AM | Plasma | Ok | |
| 6 | 10:17:56:450AM | Plasma | Ok | |
| 7 | 10:28:25:140AM | Plasma | Ok | |
| 8 | 10:51:19:650AM | Plasma | Ok | |
| 9 | 11:17:01:790AM | Plasma | Ok | |
| 10 | 11:35:22:780AM | Plasma | Ok | |
| 11 | 11:53:24:770AM | Plasma | Ok | |
| 12 | 12:25:36:040PM | Plasma | Ok | |
| 13 | 12:57:07:570PM | Plasma | Ok | |
| 14 | 01:25:50:890PM | Plasma | Ok | |
| 15 | 02:07:42:570PM | Plasma | Ok | |
| 16 | 02:26:23:590PM | Plasma | Ok | |
| 17 | 02:35:23:130PM | Plasma | Bad | mag res fault |
| 18 | 02:44:29:270PM | Plasma | Ok | |
| 19 | 03:01:45:230PM | Plasma | Ok | |
| 20 | 03:18:50:380PM | Plasma | Ok | |
| 21 | 03:35:11:230PM | Plasma | Ok | |
| 22 | 03:59:01:010PM | Plasma | Ok | |
| 23 | 04:19:24:010PM | Plasma | Ok | |
| 24 | 04:31:02:540PM | Plasma | Ok | |
| 25 | 04:41:32:600PM | Plasma | Ok | |
| 26 | 05:01:29:930PM | Plasma | Ok | |