| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Joseph Snipes |
| Physics operator(s): | John Goetz |
| Engineering operator(s): | Vinny Bertolino,Joe Daigle |
| Engineering Operator Run Comment |
| SNIPE/GOETZ::BERTOLINO/FAIRFAX |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:11:227PM |
| Author: To Be Determined |
From: LEADER::SNIPES Date: 21-JUN-1994 18:28:54 Description: Session Leader's Run Summary 940621 The goal of the run was to test the hypothesis that Li pellets improve wall conditioning and lead to reduced H-mode power threshold. Given the small air leak, it was unlikely from the outset that we would get H-modes and indeed, we did not. First, we started with shot 940617018 with EF1 and EF4 waveforms from 931027035 and 800 kA of plasma current. It was a good start and we slowly adjusted things to try to get larger gaps from the inner wall and outboard limiter. A sign error lost us several discharges as we also tried ramping down the TF to reduce the threshold, which led to disruptions because the plasma was pushed against the inner wall while we were trying to divert it as well. Finally, by shot 11, we had the correct sign on the inner gap, but were then plagued by vertical disruptions. Shot 12 was O.K., but no H-modes were found. Then, shot 13, which was not changed, had very little gas and lots of runaways for 0.4 sec. Repeating the shot went O.K., but was still rather disruptive. Then, I decided to inject Li pellets in the hope that Li wall conditioning might clean up the machine. When the pellets were injected at 0.4 sec before the plasma diverted, they did not lead to disruptions even when two pellets were fired out of the same barrel mistakenly on shot 16 and the line integrated density reached nearly 4 x 10**20 m**-2. But, each time we injected a large pellet (nominally 1.5 x 10**20 electrons) into a diverted discharge (at 0.5 sec or 0.9 sec), the plasma disrupted shortly after the pellet. This may indicate that the equilibrium of the diverted discharge is still not very robust, since similar discharges last year did not disrupt with this size pellet. Then, the RF was added from 0.6 to 0.8 sec on shot 15 and they tried to couple in up to 1.5 MW of power. For short periods of time, they achieved that power level, but the RF was constantly tripping out due to rapid changes in the coupling. We then tried combining Li pellets and RF for many discharges with little success in that many disrupted early and no H-modes were found. Finally, we tried the last three shots copying 940616004, which was an inner wall limited H-mode with RF. The plasma disrupted at 0.5 sec after a Li pellet on shot 24, then shot 25 went well without Li and 1.2 MW of RF was successfully coupled. On the last shot, we tried pulling the plasma off of the inner wall and it disrupted at 0.4 sec. Overall, except for a slow start with a power supply problem and a disconnected rogowski cable, the machine ran well. However, no H-modes were found. In that many of the discharges were well above the P/S/(neBt) power threshold sometimes by as much as a factor of two by running at low density and we still found no H-modes, I feel that the air leak has ruined the quality of the discharges and made it very difficult to get H-modes until we can close up the leak and clean up the machine. Nonetheless, the plasmas ran o.k, except that every one disrupted for one reason or another, so some programs may succeed with these machine conditions if the machine cleanliness is not very critical. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:51:960PM |
| Author: To Be Determined |
| Physics operator summary for 940621 EO: Bertolino/Fairfax PO: Goetz SL: Snipes Run 940621 was in support of Mini-Proposal #038 - Lithium Conditioning and Ohmic H Modes. This run started with divertor discharges and lithium pellets were fired to condition the walls. The H-mode threshold was to be investigated. Shot 940617018 was the shot loaded to be the starting shot. Steve Horne had prepared this shot with NL_07 on wire 9 in segment 2 to try and do density feedback. Changes were made to the EF1's and the ZCUR programming to try and mimic shot 931027035. The plasma current was increased to 0.8MA and the flat-top shortened to 1.0sec to allow for more shots. TF invert time moved to 1.1sec and PF invert time to 1.3sec. The discharges were plagued by an oscillation in the z-position for most of the day. These discharges were running at a z of -.03m. Adding extra gain to the chopper controlled ZCUR wires did not help the situation. By easing off on the elongation (using EF1's) and the ZXL position, shots 940621022 and 940621023 made it well into the ramp-down phase. Most shots disrupted early due to pellets, general filth, and high elongation (although this meant that kappa was only greater than 1.6). The RXL position was oscillating a bit today and the drawn waveform was changed to reflect the fact that the divertor was being pulled earlier and that the x-point didn't need to be held outside early in the discharge. The early part of the run was plagued by a small inner gap. This was finally corrected when the operator realized that the drawn waveform was for -.01m instead of +.01m. Once this was realized, plasmas with good inner and outer gaps were routinely obtained. There were changes made to help out the elongation during ramp-down. These changes happened to be in the wrong direction, so if any of these shots are used, change the EF1 ramps to give lower elongation not higher. Density feed-back was not tried today as the offset coming from TCI was not stable. Be careful with the offset typed into the NL_07 controller because it varied during the day and it is unknown as to which value is left there and whether it is correct. The last three shots (24, 25, 26) were limited discharges. This was an attempt to get any kind of H-mode. None were obtained. An air leak to the vacuum vessel was opened up in the p.m. on 940619 which may have affected the quality and usefulness of the discharges obtained today. Engineering today: The bus rogowski for EF1L was disconnected and a firing switch on the OH1 supply was not turned on. This cost the first two shots of the day as OH1 charged through the resistor and did not commutate. Scorecard: 26 shots = 24 plasmas + 2 p.s. duds Shot summary for Run 940621 Reload of 940617018 Changes (made to mimic shot 931027035): current flat-top to 1.0sec IP controller gain switch to 1.0sec IP = -800000 draw ZCUR = -.02 from 0.65 to 1.0sec IC_EF1L = -2000A from 0.2 to 0.5sec and ramp to 0 @ 1.0sec IC_EF1U = 2500A from 0.5 to 1.0sec NL_07 now on wire 9 in segment 2 - PID =0 and waveform = 0 Shot change result ____ _____ ______ 1 fiducial 940603015 ps dud 2 see above ps dud 3 put -22500 in offset for NL_07 predictor and no changes plasma 4 ZCUR=-.027; PULSE_GAS_3=35V; change offset on NL_07 to +22,500 plasma 5 PULSE_GAS_3 to 32V; CLEARIN = -.01 from 0.55 to 1.0sec; add P gain of 2 to third ZCUR wire @ 0.5 plasma 6 IC_EF1L to -2000A in segment 1; up CLEARIN gain to 1.5 @ 0.7sec enable B_SIDE_LOWER; leave ZCUR=-.02 and RCUR=0.67 during rampdown; NL_07 offset = -3.2e20 plasma 7 NL_07 offset = +3.2e20; PULSE_GAS_3 = 34V; IC_EF1L = -2500A from 0.1 to 0.5sec plasma 8 break point on IC_EF1's and EF2's moved to 0.95 to help with shape during ramp-down; ZCUR=-.02 after 1.0sec; TF invert time=0.9sec; NL_07 offset now +5.4e20; CLEARIN gain = 4.0 @ 0.65sec plasma 9 TF inversion time @ 0.5sec; ZCUR P gain on third wire = 3; add OH1 to CLEARIN controller with value of -1e-3 plasma 10 NL_07 offset = 7.6e20; reduce CLEARIN gain to 1.25; PULSE_GAS_3 to 38V after 0.5sec plasma 11 TF invert = 0.9sec; CLEARIN = +.01 plasma 12 PULSE_GAS_3 to 38V @ 0.3sec; turn off gain on third ZCUR wire; IC_EF1U = 2000A; ZXL ramp from 0.4 to 0.6sec plasma 13 PULSE_GAS_3 to 36V; IC_EF1U = 3000A; IC_EF1L=500A @ 0.95sec plasma 14 put waveform into NL_07 P waveform; no other changes plasma 15 Li pellets @ 0.4 and 0.5sec; CLEARIN=+.008; plasma 16 Li pellets @ 0.4 and 0.9sec; RF from 0.6 to 0.8sec; increase PULSE_GAS_3 before 0.15sec; NL_07 offset = -4e20 plasma 17 P gain on third ZCUR wire = 4; IC_EF1U=3700A @ 0.95; IC_EF1L= 1000A @ 0.95; Li pellets @ 0.5 & 0.9 plasma 18 ZXL=-.015 and move gain turn-on to 0.4sec plasma 19 reload shot 940621007; RXL=0; CLEARIN = +.01 plasma 20 Li pellet at 0.9sec; RXL=-.005; ZXL=-.015 plasma 21 ZXL=-.01; IC_EF1U=3000A @ .46 & 3700A @ .95 plasma 22 PULSE_GAS_3 = 37V; CLEARIN = +.005 plasma 23 Add OH1 to CLEARIN with value of -1e-3 plasma 24 Reload 940616004 plasma 25 fire a small Li pellet plasma 26 CLEARIN=+.01 with gain=2 plasma |
| Session Leader Comments | |||
| Jun 21 1994 09:36:57:090AM | Joseph Snipes | H-mode run with Li pellets
First, we will try to get diverted plasmas at 800 kA by copying most of the waveforms from 940617018, but using the EF1 and EF4 programming from an early ohmic H-mode shot 931027035. If we manage to get decent plasmas with the leak that we have, we will first try to get ohmic H-modes without Li pellets and then try again with Li pellets to see if they help lower the power threshold. If H-modes are not forthcoming, we may try ramping the TF down or we may try using high RF power to get into H-mode. | |
| Jun 21 1994 10:42:07:450AM | 940621003 | Joseph Snipes | Plasma! Looks close to what I want.
|
| Jun 21 1994 10:42:53:300AM | 940621004 | Joseph Snipes | Shot 4
Not bad. Need to reduce the density and increase inner wall gap. |
| Jun 21 1994 11:20:23:410AM | 940621005 | Joseph Snipes | Shot 5
Looks pretty good. No H-mode. |
| Jun 21 1994 11:21:44:860AM | 940621006 | Joseph Snipes | Shot 6
Added Ar on the previous shot. Disrupted earlier at 0.8 sec. |
| Jun 21 1994 11:27:34:320AM | 940621007 | Joseph Snipes | Shot 6
Added Ar on the previous shot. Disrupted earlier at 0.8 sec. Well above the P/S/(neBt) threshold up to 0.06. |
| Jun 21 1994 11:43:53:360AM | 940621007 | Joseph Snipes | Shot 7
Not bad shot. Disrupted late. Move TF inversion to 0.9 sec. Try to fill in the density droop as the plasma goes diverted. Still well above the H-mode power threshold. |
| Jun 21 1994 11:59:32:360AM | 940621008 | Joseph Snipes | Shot 8
Not bad shot. Disrupted late. Still no sign of H-mode. Try moving TF inversion to 0.5 sec. |
| Jun 21 1994 12:30:57:620PM | 940621010 | Joseph Snipes | Shot 10
The inner gap gain had the wrong sign. Goetz will correct it for the next shot. So, we will return to TF inversion at 0.9 sec. |
| Jun 21 1994 12:50:31:410PM | 940621011 | Joseph Snipes | Shot 11
Disrupted at 0.8 sec. Inner and outer gaps look better at 2.5 to 3 cm each. Plasma goes vertically unstable and then disrupts. |
| Jun 21 1994 12:57:20:640PM | 940621012 | Joseph Snipes | Shot 12
A bit better, but disrupted at 0.94 sec. Good gaps, but still no sign of H-mode. Density was a bit higher between 0.4 and 0.7 x 10**20 /m**2. |
| Jun 21 1994 01:24:55:860PM | 940621013 | Joseph Snipes | Shot 13
Hard x rays. Plasma seems to have hit something early and was disruptive throughout its 0.4 sec. |
| Jun 21 1994 01:46:53:500PM | 940621014 | Joseph Snipes | Shot 14
Disrupted at 0.65 sec. Very dirty! It seems that the leak is overcoming the experiment. |
| Jun 21 1994 01:58:55:450PM | 940621015 | Joseph Snipes | Shot 15
Disrupted at 0.5 sec after second Li pellet. |
| Jun 21 1994 02:15:25:790PM | 940621015 | Joseph Snipes | Shot 16
Li pellets at 0.4 and 0.9 sec. ICRF on at "full" power from 0.6 to 0.8 sec. Disrupted at 0.82 sec before second Li pellet. RF reached nearly 1 MW but was off and on, mostly off. |
| Jun 21 1994 02:45:34:020PM | 940621016 | Joseph Snipes | Shot 16
Li pellets at 0.4 and 0.9 sec. ICRF on at "full" power from 0.6 to 0.8 sec. Disrupted at 0.82 sec before second Li pellet. RF reached nearly 1 MW but was off and on, mostly off. |
| Jun 21 1994 03:01:30:840PM | 940621017 | Joseph Snipes | Shot 17
Li pellets at 0.4 and 0.9 sec. ICRF on at "full" power from 0.6 to 0.8 sec. Disrupted at 0.86 sec. No Li pellets due to finger trouble. RF reached 1 MW but was off and on, mostly off. |
| Jun 21 1994 03:21:30:170PM | 940621018 | Joseph Snipes | Shot 18
Li pellets at 0.5 and 0.9 sec. ICRF on at "full" power from 0.6 to 0.8 sec. Disrupted at 0.65 sec. Li pellet induced oscillations in Z position that led to the disruption. |
| Jun 21 1994 03:27:23:900PM | 940621019 | Joseph Snipes | Shot 19
Li pellets at 0.5 and 0.9 sec. ICRF on at "full" power from 0.6 to 0.8 sec. Disrupted at 0.56 sec. Li pellet induced oscillations in Z position that led to the disruption. |
| Jun 21 1994 03:36:09:030PM | 940621020 | Joseph Snipes | Shot 20
Li pellets at 0.5 and 0.9 sec. ICRF on at "full" power from 0.5 to 0.8 sec. Disrupted at 0.89 sec. Very small Li pellet fragment at 0.5 sec. Still have Z position problems without the pellet. |
| Jun 21 1994 03:50:52:260PM | 940621021 | Joseph Snipes | Shot 21
Li pellets at 0.5 and 0.9 sec. ICRF on at "full" power from 0.5 to 0.8 sec. Disrupted at 0.785 sec. Very small Li pellet fragment at 0.5 sec. Still have Z position problems. |
| Jun 21 1994 04:43:29:010PM | 940621022 | Joseph Snipes | Shot 22
Li pellets at 0.5 and 0.9 sec. ICRF on at "full" power from 0.5 to 0.8 sec. Disrupted at 1.1sec. Small Li pellet at 0.5 sec. No pellet at 0.9 sec. |
| Jun 21 1994 04:48:18:700PM | 940621023 | Joseph Snipes | Shot 23
Small Li pellet at 0.5 sec. Disrupted at 1 sec. RF ran, but no H-modes. |
| Jun 21 1994 04:52:05:420PM | 940621024 | Joseph Snipes | Shot 24
Large Li pellet at 0.5 sec. Disrupted at 0.52 sec with a locked mode. |
| Jun 21 1994 05:00:50:600PM | 940621025 | Joseph Snipes | Shot 25
No pellets (empty chamber). Good RF heating up to 1.2 MW |
| Jun 21 1994 05:06:08:810PM | 940621026 | Joseph Snipes | Shot 26
Attempt to pull it off the inner wall to limit on the divertor nose failed. Disrupted at 0.4 sec. Overall, the machine ran quite well, but the goals of the experiment were not met, presumably because the machine is dirty due to the air leak. We just weren't very lucky this time. |
| Physics Operator Comments | |||
| Jun 21 1994 09:06:50:270AM | John Goetz | Run 940621 - Mini-Proposal #038 Lithium Conditioning and Ohmic H Modes
Fire lithium pellets into diverted discharges in order to condition the walls and investigate the H-mode threshold Start from shot 940617018 and make changes to mimic shot 931027035 | |
| Jun 21 1994 09:11:59:230AM | 940621001 | John Goetz | Shot 940621001:
load Fiducial shot 940603015 no EF1L bus rogowski - therefore no feedback For Shot 940621002: start from 940617018 invert times: TF=1.1sec; PF=1.3sec IP =-800000 until 1.0sec IP controller gain switches @ 1.0sec IC_EF4 to 2000A at 1.0sec IC_EF1U = 2500A from 0.5 to 1.0sec IC_EF1L = -2000A from 0.2 to 0.5sec and ramps to 0 @ 1.0sec ZCUR = -2.0cm from 0.65 to 1.0sec NL_07 now on wire 9 for segment 2 |
| Jun 21 1994 09:35:33:460AM | 940621002 | John Goetz | Shot 940621002:
power supply dud OH1 only reached -9000A and did not commutate this was also true on shot 001 For Shot 940621003: offset on NL_07 (wire 9, segment 2) is 22,500, so -22,500 typed in the offset box in the predictor no other changes |
| Jun 21 1994 10:08:18:700AM | 940621003 | John Goetz | Shot 940621003:
plasma - disruption @ .825 z-position appears to be stable kappa = 1.6 and steady offset on NL_07 down to 22000 but jumps to 22,500 at the disruption For Shot 940621004: ZCUR = -.027 PULSE_GAS_3 to 35V change offset on NL_07 to +22,500 |
| Jun 21 1994 10:34:27:350AM | 940621004 | John Goetz | Shot 940621004:
plasma - disruption @ 1.06 z-position appears to be stable kappa = 1.6 and steady For Shot 940621005: CLEARIN = -.01 from 0.55 to 1.0sec PULSE_GAS_3 to 32V add P gain of 2 to third ZCUR wire @ 0.5 |
| Jun 21 1994 10:54:47:050AM | 940621005 | John Goetz | Shot 940621005:
plasma - disruption @ 1.03 z-position takes off at the rampdown kappa = 1.6 and steady equilibrium looks fine For Shot 940621006: raise CLEARIN gain to 1.5 @ 0.7sec IC_EF1L to -2000A in segment 1 enable B_SIDE_LOWER for Argon puff leave ZCUR =-.02 and RCUR =.67 during rampdown offset for NL_07 predictor = -3.2e20 |
| Jun 21 1994 11:12:54:200AM | 940621006 | John Goetz | Shot 940621006:
plasma - disruption @ 0.775 z-position starts oscillating @ .75 injection before or during the disruption? predictor out for NL_07 = 4.6e20 For Shot 940621007: NL_07 offset = +3.2e20 PULSE_GAS_3 to 34V IC_EF1L = -2500V from 0.1 to 0.5sec |
| Jun 21 1994 11:40:05:570AM | 940621007 | John Goetz | Shot 940621007:
plasma - disruption @ 1.05 predictor offset for NL_07 now 2.2e20 inner gap getting smaller after 0.6sec For Shot 940621008: move break points on IC_EF1's and IC_EF2's to 0.95 to help with shape during ramp down TF invert time = 0.9sec ZCUR = -.02 after 1.0sec NL_07 offset now +5.4e20 CLEARIN gain now 4.0 @0.65 |
| Jun 21 1994 11:59:50:370AM | 940621008 | John Goetz | Shot 940621008:
plasma - disruption @ .992 z-position oscillation starts @ 0.94sec inner gap getting smaller still after 0.6sec For Shot 940621009: add OH1 to CLEARIN controller with value of -1e-3 TF inversion time @ 0.5sec ZCUR P gain on third wire = 3 |
| Jun 21 1994 12:22:17:480PM | 940621009 | John Goetz | Shot 940621009:
plasma - disruption @ .764 multiple minor disruptions beginning @ .67sec inner gap still very small For Shot 940621010: NL_07 offset now 7.6e20 reduce CLEARIN gain to 1.25 PULSE_GAS_3 = 38v after 0.5sec |
| Jun 21 1994 12:32:55:350PM | 940621010 | John Goetz | Shot 940621010:
plasma - disruption @ .708 mea culpa - CLEARIN was drawn at -.01 For Shot 940621011: make CLEARIN = +.01 TF invert @ 0.9sec |
| Jun 21 1994 12:50:16:950PM | 940621011 | John Goetz | Shot 940621011:
plasma - disruption @ .817 growing z-oscillation beginning @ 0.78 inner gap ~ .025 and outer gap ~ .03 For Shot 940621012: PULSE_GAS_3 = 38V @ 0.3sec turn off gain on third ZCUR wire IC_EF1U = 2000A ZXL ramp from 0.4 to 0.6sec |
| Jun 21 1994 01:04:07:630PM | 940621012 | John Goetz | Shot 940621012:
plasma - disruption @ .942 growing z-oscillation beginning @ 0.85 kappa growing after 0.65sec inner gap ~ .025 and outer gap ~ .03 For Shot 940621013: PULSE_GAS_3 = 36V @ 0.3sec IC_EF1U = 3000A IC_EF1L = 500A @ 0.95 |
| Jun 21 1994 01:25:39:930PM | 940621013 | John Goetz | Shot 940621013:
plasma - disruption @ .442 trouble from the beginning - hits something @ 0.067 low density - lots of hards For Shot 940621014: cut NL_07 waveform from shot 007 into the P waveform to check the feedback |
| Jun 21 1994 01:44:47:010PM | 940621014 | John Goetz | Shot 940621014:
plasma - disruption @ .65 looks dirty - z_ave > 2 For Shot 940621015: NL_07 offset = 1e21 Li pellets @ 0.4 and 0.5sec CLEARIN = +.008 |
| Jun 21 1994 01:58:13:460PM | 940621015 | John Goetz | Shot 940621015:
plasma - disruption @ .508 moly injection @ .227sec Li pellets did it in For Shot 940621016: NL_07 offset = -4e20 increase PULSE_GAS_3 before 0.15sec Li pellets at 0.4 and 0.9 RF pulse from 0.6 to 0.8sec (1.5MW) |
| Jun 21 1994 02:18:18:080PM | 940621016 | John Goetz | Shot 940621016:
plasma - disruption @ .826 z-position oscillation beginning at 0.75 For Shot 940621017: P gain on third ZCUR wire = 4.0 lower IC_EF1L P gain to 0.5 @ .55sec IC_EF1U = 3700A @ 0.95 IC_EF1L = 1000A @ 0.95 Li pellets at 0.5 and 0.9 RF pulse from 0.6 to 0.8sec (1.5MW) |
| Jun 21 1994 02:38:54:940PM | 940621017 | John Goetz | Shot 940621017:
plasma - disruption @ .875 z-position oscillation beginning at 0.75 - ZXL stretches plasma kappa grows and the oscillation begins no Li pellets For Shot 940621018: ZXL =-.015 and move gain turn-on to 0.4sec |
| Jun 21 1994 02:58:30:890PM | 940621018 | John Goetz | Shot 940621018:
plasma - disruption @ .65 z-position oscillation beginning at 0.56 ZXL and RXL oscillating overdid the ZXL gain turn-on it looks like For Shot 940621019: SL says punt reload 940621007 RXL=0 for all time CLEARIN = +.01 |
| Jun 21 1994 03:14:29:950PM | 940621019 | John Goetz | Shot 940621019:
plasma - disruption @ .56 z-position oscillation beginning at 0.5 it looks like the Li pellet induced a vertical oscillation For Shot 940621020: ZXL = -.015 RXL = -.005 Li pellet at 0.9sec |
| Jun 21 1994 03:33:34:000PM | 940621020 | John Goetz | Shot 940621020:
plasma - disruption @ .89 one z-oscillation and its gone - kappa reaches 1.67 For Shot 940621021: ZXL = -.01 IC_EF1U=3000A @ .46 and 3700A @ 0.95 |
| Jun 21 1994 03:53:22:370PM | 940621021 | John Goetz | Shot 940621021:
plasma - disruption @ .78 upper x-point beginning to appear - z oscillation beginning @ .75 For Shot 940621022: CLEARIN = .005 - less clearance, less elongation PULSE_GAS_3 = 37V for more density |
| Jun 21 1994 04:09:15:430PM | 940621022 | John Goetz | Shot 940621022:
plasma - disruption @ 1.1 (into rampdown) break in the plasma current @ .95sec - the plasma jumps in For Shot 940621023: add OH1 to CLEARIN with value of -1e-3 |
| Jun 21 1994 04:32:52:330PM | 940621023 | John Goetz | Shot 940621023:
plasma - disruption @ 1.0 break in the plasma current @ .95sec - the plasma jumps out For Shot 940621024: go back to limited discharges reload 940616004 |
| Jun 21 1994 04:39:10:370PM | 940621024 | John Goetz | Shot 940621024:
plasma - disruption @ 0.52sec pellet induced disruption ( a large Li pellet ) For Shot 940621025: fire small Li pellet |
| Jun 21 1994 05:02:24:460PM | 940621025 | John Goetz | Shot 940621025:
plasma - all the way down For Shot 940621026: CLEARIN = +.01 with gain of 2 |
| Jun 21 1994 05:28:17:980PM | 940621026 | John Goetz | Shot 940621026:
plasma - disruption @ .375 - caused by the attempt to use CLEARIN with no x-point in the machine |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:58:30:600AM | Plasma | Ok | ef1l rogowski - no signal, no plasma |
| 2 | 09:11:56:510AM | Plasma | Bad | oh1 switch didnt close |
| 3 | 09:36:47:110AM | Plasma | Ok | no faults |
| 4 | 10:07:38:560AM | Plasma | Ok | no faults |
| 5 | 10:32:27:560AM | Plasma | Ok | no faults |
| 6 | 10:55:15:240AM | Plasma | Ok | no faults |
| 7 | 11:16:58:250AM | Plasma | Ok | no faults |
| 8 | 11:41:42:550AM | Plasma | Ok | no faults |
| 9 | 12:05:53:180PM | Plasma | Ok | no faults |
| 10 | 12:22:31:450PM | Plasma | Ok | no faults |
| 11 | 12:34:11:640PM | Plasma | Ok | disruption induced comm fault ef1l and oh1 |
| 12 | 12:50:11:680PM | Plasma | Ok | oh2l comm fault at disruption |
| 13 | 01:11:59:230PM | Plasma | Ok | 600 kA disruption during current rise |
| 14 | 01:26:47:080PM | Plasma | Ok | 11th 800 kA disruption; this one at 0.65 sec |
| 15 | 01:45:23:570PM | Plasma | Ok | 800 kA disruption at 0.5 sec |
| 16 | 02:00:32:740PM | Plasma | Ok | yet another 800 kA hit' double Li pellets don't seem to help much |
| 17 | 02:17:37:350PM | Plasma | Ok | 800 kA disruption; shot rate limited by physops past 3 shots |
| 18 | 02:39:15:190PM | Plasma | Ok | 800 kA hit at 0.7 sec; 2 power supplies have induced comm faults |
| 19 | 02:59:23:840PM | Plasma | Ok | 800 kA disruption-induced commutation failure in OH2L |
| 20 | 03:16:36:300PM | Plasma | Ok | another 800 kA hit takes out OH1 and EF1L |
| 21 | 03:32:58:140PM | Plasma | Ok | another 800 kA hit; at least 2 diverter shunts now inoperative |
| 22 | 03:52:57:940PM | Plasma | Ok | disrupted at 600 kA (better than 800!) |
| 23 | 04:08:43:230PM | Plasma | Ok | 600 kA disruption |
| 24 | 04:29:37:970PM | Plasma | Ok | pellet-induced locked mode caused early 800 kA disruption on reload of 9 |
| 25 | 04:44:29:720PM | Plasma | Ok | no disruption!!! Could be related to no Li pellets this shot. |
| 26 | 05:00:21:870PM | Plasma | Ok | early 800 kA disruption |