| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Yuichi Takase,Yuichi Takase |
| Physics operator(s): | John Goetz |
| Engineering operator(s): | Frank Silva,Joe Daigle |
| Engineering Operator Run Comment |
| preboron fiducials/goetz/marmer/silva/ps supply tests |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:56:440PM |
| Author: To Be Determined |
| Physics operator summary for 960814 EO: Silva / Daigle PO: Goetz SL: Marmar Run 960814 was in support of Mini-Proposal #159A - Restart Alcator C-Mod and Mini-Proposal #148 - RF Conditioning. The goals for today are to try and get C-Mod operational once again. If indeed acceptable plasmas are produced, check-out of diagnostics and RF conditioning will be done. Plan: power supply tests OH test run an old shot with standard precharge on the ohmic stack and with the EF4's in series twiddle gas and fields until reproducible continue until the day is over The plan was not carried out. No plasmas were obtained. Some things discovered today: 1) Scans of Br, Bz, and fill pressure were performed. The flux plots and the reconstructed vacuum magnetic signals looked comparable to those obtained on 960105. Thus the string of duds and fizzles remains unexplained. 2) The B-Top piezoelectric valve is linear (P_0[Torr] = 2.9E-6 * PG4[msec]) with 5.5PSIA of deuterium. 3) Breakdown studies clearly are needed. Engineering, computing, and diagnostics today: Many TF crowbars occurred late in the day which are still in under investigation. The first TF crowbar happened with the EF4's in series. A hangup was encountered when the system disk was full. Scorecard: 36 shots = 0 plasmas + 13 fizzles + 5 tests + 18 duds Shot summary for Run 960814: Load 960105009 remove 100V point at t=0 from PG3 prefill puff = 18msec coldstart hybrid - all matrices respond Shot change result ____ _____ ______ 1 OH coax test o.k. 2 load 960105009, remove 100V dud - radial field = 2mT pulse from PG3 at t=0 3 BR_0 offset = .006 fizzle - Bz in too early 4 prefill pulse = 15msec; dud - too little gas?? - Bz in too early?? BR_0 = .0055 5 PG4 width = 17msec; BR_0 = .005 dud - Bz in too early 6 BR_0 offset = .006; IC_EF4 = fizzle - z_meter array says light is centered -1180A 7 PG3 starting at .02sec fizzle - camera says the light is inside 8 IC_EF4 = -1190A fizzle - weak one 9 fill pulse = 15msec fizzle - 30kA - no current channel 10 fill pulse = 13msec fizzle - very weak - no density 11 fill pulse = 15msec; BR_0=.005 fizzle - .07MA - current channel moves in - Br very positive at .02sec 12 V_OH1 = 200V from .005 to .015s magnet resistance fault 13 try again fizzle - weak - no current channel 14 prefill = 16msec fizzle - Br too low? 15 BR_0=.0055T; V_OH1=175V dud - Br too high 16 BR_0 = .0045 fizzle - late breakdown 17 BR_0 = .0035 dud - Br too negative 18 BR_0=.0045; V_OH1=225V dud - Br too negative 19 reload 960814011 dud - ????? 20 BR_0=.0055; prefill = 17msec fizzle - breakdown @ 7msec 21 prefill = 19msec fizzle - weak - late breakdown 22 IC_EF4 = -1180A dud 23 IC_EF4=-1190A; prefill 13msec dud 24 prefill 21msec dud 25 prefill 17msec; BR_0=.005; dud IC_EF4=-1200A 26 prefill 26msec TF crowbar before commutation 27 try again TF crowbar before commutation 28 try again TF crowbar before commutation 29 try again TF crowbar before commutation 30 try again fizzle - breakdown @ 7msec 31 prefill 18msec, PG3 on at 8msec dud - fields look o.k. 32 prefill 24mc; PG3 on at -10ms; TF crowbar before commutation EF4's in parallel 33 try again, EF3 off TF crowbar before commutation 34 try again, EF3 off TF crowbar eliminated (low voltage) 35 test again, EF3 off TF crowbar before commutation 36 test again, EF3 off TF crowbar |
| Session Leader Comments | |||
| Aug 14 1996 08:55:01:850AM | 960814002 | Earl Marmar | Plasma attempt. Series EF4, 18 msec gas pre-pulse;
Dud Possibly too much radial field (~2 mT at t=0) |
| Aug 14 1996 09:07:38:350AM | 960814003 | Earl Marmar | change B_r offset, from 7 to 6 mT
fizzle |
| Aug 14 1996 09:16:01:760AM | 960814004 | Earl Marmar | change B_r offset, from 6 to 5.5 mT
gas prepulse to 15 ms (from 18) dud |
| Aug 14 1996 09:25:34:240AM | 960814005 | Earl Marmar | change B_r offset, from 5.5 to 5 mT
gas prepulse to 17 ms dud |
| Aug 14 1996 09:42:48:640AM | 960814006 | Earl Marmar | change B_r offset, from 5 to 6 mT
gas prepulse still 17 ms add -30 A to EF4 fizzle |
| Aug 14 1996 09:52:59:220AM | 960814007 | Earl Marmar | gas prepulse still 17 ms
delay PG3 fizzle |
| Aug 14 1996 10:12:43:450AM | 960814008 | Earl Marmar | add -10 A to EF4
fizzle |
| Aug 14 1996 10:25:31:190AM | 960814009 | Earl Marmar | lower prepuff to 15 ms
fizzle |
| Aug 14 1996 10:33:59:320AM | 960814010 | Earl Marmar | lower prepuff to 13 ms
fizzle (very weak) |
| Aug 14 1996 10:56:39:880AM | 960814011 | Earl Marmar | raise prepuff to 15 ms
B_r offset to 5 mT from 6 mT 70 kA fizzle |
| Aug 14 1996 11:04:01:950AM | 960814012 | Earl Marmar | add 50 V to OH1 (to slow the B_z ramp)
power supply dud (probable magnet resistance fault) |
| Aug 14 1996 11:15:57:060AM | 960814013 | Earl Marmar | re-try
fizzle |
| Aug 14 1996 11:36:27:650AM | 960814014 | Earl Marmar | prepuff to 16 ms from 15 (gasheads will be gasheads)
fizzle |
| Aug 14 1996 11:56:01:150AM | 960814015 | Earl Marmar | B_r to 5.5 from 5
undo OH1 voltage change dud |
| Aug 14 1996 12:12:56:650PM | 960814016 | Earl Marmar | B_r to 4.5 from 5.5
60 kA fizzle |
| Aug 14 1996 12:35:12:720PM | 960814017 | Earl Marmar | B_r to 3.5 from 4.5
dud |
| Aug 14 1996 12:35:29:120PM | 960814018 | Earl Marmar | B_r to 4.5 from 3.5
dud |
| Aug 14 1996 01:03:15:120PM | 960814019 | Earl Marmar | reload shot 11
dud |
| Aug 14 1996 01:12:03:930PM | 960814020 | Earl Marmar | pre-puff to 17 ms from 15 ms
B_r offset to 5.5 from 5 mT fizzle |
| Aug 14 1996 01:25:56:830PM | 960814021 | Earl Marmar | pre-puff to 19 from 17 ms
fizzle |
| Aug 14 1996 01:47:43:950PM | 960814022 | Earl Marmar | subtract -10 A from EF4 to -1180
dud |
| Aug 14 1996 01:57:54:930PM | 960814023 | Earl Marmar | EF4 to -1190
pre-puff to 13 ms dud |
| Aug 14 1996 02:12:42:760PM | 960814024 | Earl Marmar | pre-puff to 21 ms
dud |
| Aug 14 1996 02:22:35:170PM | 960814025 | Earl Marmar | B_r offset to 5 mT
add -10 A to EF4 pre-puff to 17 ms dud |
| Physics Operator Comments | |||
| Aug 14 1996 07:57:54:310AM | John Goetz | Run 960814
In support of mini-proposal 159A - Restart Alcator C-Mod and mini-proposal 148 - RF Conditioning Start from an old shot (960105009) with the EF4's in series and the standard precharge scenario Tweak until the plasmas are reproducible | |
| Aug 14 1996 08:31:11:660AM | 960814001 | John Goetz | Shot 960814001:
OH coax test Results: all o.k. |
| Aug 14 1996 08:53:00:940AM | 960814002 | John Goetz | Shot 960814002:
load 960105009 remove 100V point @ t=0 from PG3 Results: dud radial field = .002T @ 0; too much OH2U |
| Aug 14 1996 09:04:48:380AM | 960814003 | John Goetz | Shot 960814003:
BR_0 offset = .006 (was .007) Results: fizzle fairly weak discharge Bz in too early? |
| Aug 14 1996 09:18:06:560AM | 960814004 | John Goetz | Shot 960814004:
lower prefill pulse to 15msec (was 18msec) BR_0 offset = .0055 Results: dud fill pressure = 4.2e-5 Br >= 1mT |
| Aug 14 1996 09:26:19:620AM | 960814005 | John Goetz | Shot 960814005:
raise prefill pulse to 17msec BR_0 offset = .005 Results: dud Bz = 12mT @ 3msec (was 9mT @ 3msec on 960105009) |
| Aug 14 1996 09:45:32:510AM | 960814006 | John Goetz | Shot 960814006:
BR_0 offset = .006 IC_EF4 = -1180A (was -1150A) Results: fizzle Z-meter array shows the light is centered but no current channel formation on the GPC |
| Aug 14 1996 09:54:15:800AM | 960814007 | John Goetz | Shot 960814007:
slide PG3 to start at .020 Results: fizzle camera says the light remains to the inside |
| Aug 14 1996 10:08:23:710AM | 960814008 | John Goetz | Shot 960814008:
IC_EF4 = -1190A Results: fizzle - a weak one |
| Aug 14 1996 10:22:41:270AM | 960814009 | John Goetz | Shot 960814009:
fill pulse = 15 msec Results: fizzle - 30kA - no current channel formation |
| Aug 14 1996 10:35:07:450AM | 960814010 | John Goetz | Shot 960814010:
fill pulse = 13 msec Results: fizzle - very weak late breakdown - almost a dud no density - no visible light signals |
| Aug 14 1996 10:57:54:550AM | 960814011 | John Goetz | Shot 960814011:
fill pulse = 15 msec BR_0 = .005 Results: fizzle - .070MA current channel formation - moves in radial field very positive at .02sec |
| Aug 14 1996 11:00:19:520AM | 960814012 | John Goetz | Shot 960814012:
V_OH1 = 200V from .005 to .015sec Results: magnet resistance fault |
| Aug 14 1996 11:13:43:740AM | 960814013 | John Goetz | Shot 960814013:
V_OH1 = 200V from .005 to .015sec Results: fizzle - weak - no current channel |
| Aug 14 1996 11:41:39:380AM | 960814014 | John Goetz | Shot 960814014:
prefill pulse = 16msec Results: fizzle - breakdown @ .008 Br a little too low? |
| Aug 14 1996 11:55:31:700AM | 960814015 | John Goetz | Shot 960814015:
BR_0 = .0055 V_OH1 = 175V Results: dud Br too positive according to the recon scope |
| Aug 14 1996 12:11:20:800PM | 960814016 | John Goetz | Shot 960814016:
BR_0 = .0045 Results: fizzle - .06MA late breakdown Br rises to 4mT after breakdown - was 2mT on good shots |
| Aug 14 1996 12:24:23:310PM | 960814017 | John Goetz | Shot 960814017:
BR_0 = .0035 Results: dud radial field too negative |
| Aug 14 1996 12:38:07:470PM | 960814018 | John Goetz | Shot 960814018:
BR_0 = .0045 V_OH1 = 225V from .005 to .015 Results: dud - Br still too negative |
| Aug 14 1996 01:03:02:150PM | 960814019 | John Goetz | Shot 960814019:
punt - reload 960814011 with no changes Results: dud - explain that one |
| Aug 14 1996 01:11:00:520PM | 960814020 | John Goetz | Shot 960814020:
BR_0 offset = .0055 prefill puff = 17msec Results: fizzle - breakdown @ ~7msec |
| Aug 14 1996 01:23:10:520PM | 960814021 | John Goetz | Shot 960814021:
prefill puff = 19msec Results: fizzle - weak - late breakdown |
| Aug 14 1996 01:44:12:870PM | 960814022 | John Goetz | Shot 960814022:
IC_EF4 = -1180A Results: dud |
| Aug 14 1996 01:56:49:690PM | 960814023 | John Goetz | Shot 960814023:
IC_EF4 = -1190A prefill puff = 13msec Results: dud |
| Aug 14 1996 02:12:24:240PM | 960814024 | John Goetz | Shot 960814024:
prefill puff = 21msec Results: dud |
| Aug 14 1996 02:32:58:790PM | 960814025 | John Goetz | Shot 960814025:
prefill puff = 17msec BR_0 = .005 IC_EF4 = -1200A Results: dud |
| Aug 14 1996 02:46:37:970PM | 960814026 | John Goetz | Shot 960814026:
prefill puff = 26msec Results: TF crowbar before commutation |
| Aug 14 1996 03:01:03:650PM | 960814027 | John Goetz | Shot 960814027:
prefill puff = 26msec Results: TF crowbar early |
| Aug 14 1996 03:26:11:160PM | 960814028 | John Goetz | Shot 960814028:
prefill puff = 26msec Results: TF crowbar before commutation |
| Aug 14 1996 03:55:16:300PM | 960814029 | John Goetz | Shot 960814029:
prefill puff = 26msec Results: TF crowbar early |
| Aug 14 1996 03:58:32:990PM | 960814030 | John Goetz | Shot 960814030:
prefill puff = 26msec purge and refill B_TOP to 5.5PSIA of D2 Results: fizzle - breakdown at 7msec |
| Aug 14 1996 04:17:15:790PM | 960814031 | John Goetz | Shot 960814031:
prefill puff = 18msec move PG3 to 8msec Results: dud - fields look o.k. |
| Aug 14 1996 04:30:33:350PM | 960814032 | John Goetz | Shot 960814032:
prefill puff = 24msec move PG3 to -10msec EF4's in parallel Results: TF crowbar before commutation |
| Aug 14 1996 04:44:55:240PM | 960814033 | John Goetz | Shot 960814033:
prefill puff = 24msec move PG3 to -10msec EF4's in parallel Results: TF crowbar before commutation |
| Aug 14 1996 05:04:30:710PM | 960814034 | John Goetz | Shot 960814034 - 36:
engineering tests for the TF crowbar problem |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:29:05:660AM | Test | Ok | oh test |
| 2 | 08:41:35:480AM | Test | Ok | no faults |
| 3 | 08:55:12:230AM | Test | Ok | no faults |
| 4 | 09:09:53:400AM | Test | Ok | no faults |
| 5 | 09:20:22:800AM | Test | Ok | no faults |
| 6 | 09:32:15:780AM | Test | Ok | no faults |
| 7 | 09:46:35:820AM | Test | Ok | |
| 8 | 09:59:19:780AM | Test | Ok | |
| 9 | 10:13:50:950AM | Test | Ok | no faults |
| 10 | 10:28:35:700AM | Test | Ok | no faults |
| 11 | 10:43:24:040AM | Test | Ok | |
| 12 | 10:58:08:860AM | Plasma | Ok | no 13.8 power supplies operated |
| 13 | 11:04:41:900AM | Plasma | Ok | |
| 14 | 11:28:08:210AM | Plasma | Ok | no faults |
| 15 | 11:49:10:980AM | Plasma | Ok | no faults |
| 16 | 12:03:54:350PM | Plasma | Ok | no faults |
| 17 | 12:18:24:580PM | Plasma | Ok | no faults |
| 18 | 12:33:00:700PM | Plasma | Ok | no faults |
| 19 | 12:49:07:400PM | Plasma | Ok | no faults |
| 20 | 01:03:50:320PM | Plasma | Ok | no faults |
| 21 | 01:18:34:510PM | Plasma | Ok | no faults |
| 22 | 01:33:12:030PM | Plasma | Ok | |
| 23 | 01:49:30:100PM | Plasma | Ok | |
| 24 | 02:06:28:060PM | Plasma | Ok | |
| 25 | 02:20:30:550PM | Plasma | Ok | no faults |
| 26 | 02:35:21:510PM | Plasma | Bad | TF Cbar |
| 27 | 02:58:26:270PM | Plasma | Bad | TF C-bar |
| 28 | 03:12:47:860PM | Plasma | Bad | TF c-bar |
| 29 | 03:30:25:740PM | Test | Ok | C-bar TF |
| 30 | 03:48:22:480PM | Test | Ok | |
| 31 | 04:05:53:110PM | Test | Ok | |
| 32 | 04:27:05:840PM | Test | Bad | tf xbar |
| 33 | 04:38:11:020PM | Test | Ok | |
| 34 | 04:52:41:100PM | Test | Ok | |
| 35 | 04:59:34:710PM | Test | Ok | |
| 36 | 05:07:23:750PM | Test | Ok | |