| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Jim Terry |
| Physics operator(s): | Joseph Snipes |
| Engineering operator(s): | Frank Silva |
| Engineering Operator Run Comment |
| Snipe/Terry/Silva |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:18:947PM |
| Author: To Be Determined |
| The purpose of this run (and Tuesday's run) is to calibrate McPherson and HIREX Spectrometers as detailed in MP No. 211 " Constant shots to calibrate McPherson and HIREX Spectrometers". We started with shot 990203015, with same Ar puff, but added an additional He puff starting at 0.65 s (on some early shots this puff started at 0.7 s.) After shot 008 the shots were kept as constant as possible. RF ran from 1.0 sec to 1.2 sec at 2.5 MW for most of the day. During RF, H/D ratio was pushed up more than without RF, but only a few percent (about 5% more than usual at that time in the shot). We had no H-modes, probably because the H/D ratio was too high. It was always >15% during the RF pulse. The sensitivity of the McPherson spectrometer is calibrated using the so-called branching ratio technique. This relies on observation along the same line-of-sight of two spectral lines originating from the same upper state, one in the VUV and one in the visible. The intensity ratio of such a pair of line can be calculated quite accurately. Thus a calibration in the visible is to be transferred to the VUV. The line pairs we used in today's run were: D_0 1025 A (Ly_beta) & 6563 A (D_alpha) D_0 972 A (Ly_gamma) & 4861 A (D_beta) He_0 537 A & 5016 A He+ 247 A (Ly_gamma) & 4686 A (Paschen_alpha) He+ 256 A (Ly_beta) & 1640 A (Balmer_alpha) Since there is so much Carbon in the machine, we also tried CIV 312 A & 5801+5812 A The identification of the weak visible lines 5801, 5812 A in the Chromex spectrum is shakey, but there appears to be something there. The McPherson calibration is about 50% complete. For HIREX the views, relative sensitivities, and instrumental spectral resolutions of each of five spectrometers was calibrated. This was done by having pairs of spectrometers view Ar lines from the same plasma region. In addition the pairs' views are scanned as much as possible so that the entire poloidal cross-section can be covered by the combination of all five spectrometers. About 60% of this calibration work was completed. A shot-by-shot account follows: 003 Good shot - saw He puff with McP at .73 s. Divertor appears to detach at 1 s 004 Good shot - saw He puff with McP and Chromex at .73 s. 005 Good shot - McP and Chromex looking at HeI 006 Good shot - McP and Chromex looking at HeI 007 Disrupted at 0.64 s 008 Good shot - Start constant shots - McP and Chromex looking at HeI 009 Good shot - McP and Chromex looking at HeII 010 Good shot - McP and Chromex looking at HeII 011 Good shot - McP on 1640 A (barely saw it) and Chromex looking at HeII 012 Good shot - McP had data problem, Chromex looking at HeII 013 Good shot - McP had data problem, Chromex looking at HeII 014 Good shot - McP had data problem, Chromex looking at HeII 015 Good shot - McP had data problem, Chromex looking at HeII 016 Good shot - McP had data problem, Chromex looking at HeII 017 Good shot - McP now fixed - looking at D_0 - Chromex looking at D_beta in divertor 018 Good shot - McP looking at D_0 - Chromex looking at D_beta in divertor 019 Disrupted at 0.256 s 020 Disrupted at 0.137 s 021 Good shot - McP looking at D_0 - Chromex looking at D_beta in divertor 022 Good shot - McP looking at D_0 - Chromex looking at D_beta in midplane 023 Good shot - McP looking at CIV -312 A, Chromex looking for 5801, 5812 in divertor 024 Good shot - McP looking at CIV -312 A, Chromex looking for 5801, 5812 in divertor 025 Good shot - McP and Chromex looking at HeII in divertor 026 Good shot - McP HV tripped, Chromex looking at HeII in divertor 027 Good shot - McP on 1640 A (barely saw it) and Chromex looking at HeII 028 Disrupted at 0.88 s - McP on 1640 A (barely saw it) and Chromex looking at HeII |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:00:003PM |
| Author: To Be Determined |
| Physop Summary for 990205 MP 211 McPherson,HiRex* Calibrations Physop: Joseph Snipes Session Leader: Jim Terry Engineer in charge: Frank Silva Engineering Setup for Friday 990205 Load from 990203015 Overnight ECDC in D2 TF under hybrid control Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid enabled fill B-side upper with 10 psi of He4 Hybrid enabled fill C-side with 30 psi of D2 Hybrid enabled The following gate valves should be enabled, assuming no vacuum problems: ECE VUV Start with shot 990203015, with same Ar puff, but with additional He puff starting at 0.7 s. This puff should increase NL_04 to ~1.3e20 m^-2. This may have to be fine tuned depending on the signals. Once we agree that this is appropriate for the HIREX, the McPherson, and the Chromex spectrometers, we will keep the shot essentially constant for the rest of the run. Overall, it was a very good run. We got 26 plasmas out of 28 shots. The first two were "engineering test shots". Of the plasmas, four disrupted before ramp down and all of the others disrupted in rampdown. So, there were 22 useful full length discharges. J. T. will finish the calibrations on Tuesday. Shot Summary: Shot 1: Copied shot 990203015 and added a He4 puff at 100 V from 0.7 to 0.9 sec Test shot to correct TMX error. Shot 2: Only 3 power supplies fired. Others failed due to an engineering setup problem. Shot 3: Good shot. Shot 4: Repeat. Good shot. Shot 5: Added 5 msec to Ar puff, now from 0.30 - 0.336 sec. Changed density feedback wire to TCI NL04 from the Zmeter. Good shot. Shot 6: He4 puff starting at 0.65 instead of 0.7 and stopping at 0.9 sec. Good shot. Shot 7: Modified rampdown to reduce the elongation after 1.2 sec and push the plasma against the inner wall to help pumpout the density before the current gets too low to sustain the density. Disrupted at 0.62 sec due to a Moly brick. Shot 8: Try again with no changes. Good shot. Rampdown a little longer. Shot 9: Modified the rampdown a little more to try to push the plasma against the inner wall after 1.2 sec and reduce the elongation. Good shot. Rampdown is not as good however. Disrupted at 1.3 sec. Shot 10: Modified the rampdown again to try to keep the plasma elongated a little longer into the rampdown to maintain a larger plasma while the current is still relatively high. Good shot. Rampdown until about 1.37 sec when it disrupted at about 0.5 MA. Shot 11: Modified rampdown a bit to try not to push the plasma against the wall so strongly after 1.2 sec. Made more gradual changes in RCUR and CLEARIN after 1.2 sec. Good shot. Shot 12: Repeat. Good shot. Shot 13: Modified rampdown again to try to maintain a large elongated plasma well into the rampdown. Modified RCUR and CLEARIN to nearly maintain the plasma shape well into the rampdown. Good shot. Shot 14: Short cell opening to open up a cooling valve. Modified rampdown again slightly. The plasma moves up well before the disruption on the previous shots though ZCUR is programmed to be flat. Try keeping ZXU and ZXL constant through the rampdown. Good shot. Shot 15: J.T. went in to check something. Modified rampdown once again moving RXU and RXL inward during the rampdown. Maybe the strike point in the lower divertor is moving across some loaded surfaces and releasing more gas into the plasma during rampdown. Good shot. Shot 16: Modified rampdown again to keep CLEARIN and RCUR constant out to 1.5 sec. Good shot. Shot 17: Moved RXL in by 3 cm after 1.2 sec to try to improve the rampdown. Good shot. Rampdown looks better. Disrupts at 1.48 sec. Shot 18: Modified rampdown some more moving RXU in after 1.2 sec and moving ZXU and ZXL in toward the plasma center after 1.2 sec, which they were doing anyway without programming them. Good shot. Shot 19: Modified rampdown again moving CLEARIN and RCUR in by 0.5 - 1 cm after 1.2 sec and some more tweaks on the X point locations. Disrupted at 0.27 sec without clear precursors, probably a brick, though Rice sees nothing on the HIREX signals. It was not vertically unstable. Shot 20: Try again. Disrupted at 0.13 sec. Shot 21: Repeat. Good shot. Good rampdown past 1.5 sec. Shot 22: Modified rampdown a bit more reducing RCUR and CLEARIN to reduce the inner gap by another 0.5 cm and moved in RXL and RXU by another 1 cm after 1.2 sec. Good shot. Rampdown not as good as shot 21. Shot 23: Copied shot 990205021 and then modified CLEARIN and RCUR only after 1.4 sec to try to make the rampdown last still longer. Good shot, rampdown better than shot 21 out to 1.52 sec. Shot 24: Modified rampdown again past 1.4 sec to try to make the rampdown last longer still. Moved X points further in radially and vertically. Good shot. Rampdown not quite as good as 23. Shot 25: Returned to rampdown of shot 990205023 then modified rampdown after 1.4 sec to try to force ZCUR down by 1 cm when it is trying to go up. Good shot. Rampdown lasts to 1.5 sec. Shot 26: Modified rampdown again moving X points in radially and vertically after 1.4 sec. Also moved CLEARIN and RCUR in a bit after 1.4 sec. Good shot. Rampdown until 1.51 sec. Shot 27: Modified rampdown again moving ZCUR down another 1 cm after 1.4 sec to attempt to compensate for the plasmas upward motion. Good shot. Rampdown the same. Shot 28: Increased EF4U current after 1.25 sec to try to keep it away from cross-over at the disruption. Disrupted at 0.89 sec. There was also a bite out of the current around 0.4 sec. There was an intentional impurity injection (Au) at 0.25 sec. Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax 1 0.000 0.005 2 0.000 0.007 3 1.380 0.812 4 1.389 0.817 5 1.413 0.812 6 1.418 0.812 7 0.645 0.812 8 1.484 0.817 9 1.332 0.812 10 1.381 0.812 11 1.427 0.817 12 1.434 0.820 13 1.423 0.823 14 1.423 0.818 15 1.447 0.820 16 1.435 0.818 17 1.485 0.820 18 1.492 0.817 19 0.261 0.688 20 0.141 0.425 21 1.518 0.820 22 1.427 0.812 23 1.535 0.812 24 1.518 0.820 25 1.511 0.812 26 1.518 0.812 27 1.520 0.817 28 0.896 0.869 Finished summary for 990205 Total of 28 shots. 28 shots. 26 plasmas. 0 fizzles. 2 tests. |
| Session Leader Comments | |||
| Feb 5 1999 09:24:44:060AM | Jim Terry | The purpose of this run (and Tuesday's run) is to calibrate McPherson and HIREX Spectrometers as detailed in MP No. 211 " Constant shots to calibrate McPherson and HIREX Spectrometers". We will start with shot 990203015, with same Ar puff, but with additional He puff starting at 0.7 s. This puff should increase NL_04 to ~1.3e20 m^-2. This may have to be fine tuned depending on the signals. Once we agree that this is appropriate for the HIREX, the McPherson, and the Chromex spectrometers, we will keep the shot essentially constant for the rest of the run. The sensitivity of the McPherson spectrometer is calibrated using the so-called branching ratio technique. This relies on observation along the same line-of-sight of two spectral lines originating from the same upper state, one in the VUV and one in the visible. The intensity ratio of such a pair of line can be calculated quite accurately. Thus a calibration in the visible can be transferred to the VUV. The line pairs we have used in the past have been: D_0 1025 A (Ly_beta) & 6563 A (D_alpha) D_0 972 A (Ly_gamma) & 4861 A (D_beta) D_0 950 A (Ly_delta) & 4340 A (D_gamma) He_0 537 A & 5016 A He+ 247 A (Ly_gamma) & 4686 A (Paschen_alpha) He+ 253 A (Ly_beta) & 1640 A (Balmer_alpha) Since there is so much Carbon in the machine, we will also try CIV 312 A & 5801+5812 A For HIREX the views, relative sensitivities, and instrumental spectral resolutions of each of five spectrometers must be calibrated. This is done by having pairs of spectrometers view Ar lines from the same plasma region. In addition the pairs' views are scanned as much as possible so that the entire poloidal cross-section could be covered by the combination of all five spectrometers. | |
| Feb 5 1999 09:28:15:967AM | 990205003 | Jim Terry | Good shot - saw He puff with McP at .73 s Divertor detaches at 1 s |
| Feb 5 1999 09:52:49:170AM | 990205004 | Jim Terry | Good shot - saw He puff with Chromex and McP at .73 s RF ON at .9 s |
| Feb 5 1999 10:03:51:403AM | 990205005 | Jim Terry | Good shot - saw He puff with Chromex and McP at .73 s Chromex looking at 5016 A, McP Looking at HeI spectrum. Chromex central wavelength was 5000 A No RF |
| Feb 5 1999 10:13:22:903AM | 990205006 | Jim Terry | Good shot - saw He puff with Chromex and McP at .73 s Chromex looking at 5016 A, McP Looking at HeI spectrum. Chromex central wavelength was 4860 A. RF from 1 to 1.2 s |
| Feb 5 1999 10:24:37:793AM | 990205007 | Jim Terry | Disrupted at 0.64 s - looks like a brick of something. |
| Feb 5 1999 10:48:40:467AM | 990205008 | Jim Terry | Good shot - HIREX has started its scan, so this is the constant shot we want to keep. McP looking at 537 A - Chromex at 5016 A. McP jack at 12.18. |
| Feb 5 1999 11:09:07:373AM | 990205009 | Jim Terry | Good shot - McP looking at 243 A - Chromex at 4686 A. McP jack at 14.43. |
| Feb 5 1999 11:27:20:250AM | 990205010 | Jim Terry | Good shot - McP looking at 243 A and 256 A - Chromex at 4686 A. McP jack at 14.43. |
| Feb 5 1999 11:46:33:607AM | 990205011 | Jim Terry | Good shot - McP looking at 1640 A (barely saw it) - Chromex at 4686 A. McP jack at 14.43. |
| Feb 5 1999 12:19:54:733PM | 990205012 | Jim Terry | Good shot - McP had a HV problem - Chromex at 4686 A. McP jack at 14.43. |
| Feb 5 1999 12:27:20:687PM | 990205013 | Jim Terry | Good shot - Again a HV problem on McP - Chromex at 4686 A. McP jack at 14.43. |
| Feb 5 1999 12:45:03:733PM | 990205014 | Jim Terry | Good shot - HV trip on McP - Chromex at 4686 A. McP jack at 14.43. |
| Feb 5 1999 01:48:28:170PM | 990205015 | Jim Terry | Good shot - McP has signal problem (electrical, not HV) - Chromex at 4686 A. McP jack at 14.43. |
| Feb 5 1999 01:49:50:857PM | 990205016 | Jim Terry | Good shot - Had a cell access ot check detector wires on McP. McP still has signal problem (electrical, not HV) - Chromex at 4686 A. McP jack at 14.43. |
| Feb 5 1999 01:51:11:200PM | 990205017 | Jim Terry | Good shot - McP signal is back looking at Ly beta, gamma - Chromex at 4861 A. McP jack at 14.43. |
| Feb 5 1999 01:58:34:763PM | 990205018 | Jim Terry | Good shot - McP looking at Ly beta, gamma - Chromex at 4861 A. McP jack at 14.43. |
| Feb 5 1999 02:08:21:873PM | 990205019 | Jim Terry | Dirsupted at 0.256 s |
| Feb 5 1999 02:26:45:530PM | 990205020 | Jim Terry | disrupted at 0.137 s |
| Feb 5 1999 02:52:30:513PM | 990205021 | Jim Terry | Good shot - McP looking at Ly beta, gamma - Chromex at 4861 A. McP jack at 14.43. - |
| Feb 5 1999 03:00:47:920PM | 990205022 | Jim Terry | Good shot - McP looking at Ly beta, gamma - Chromex at 4861 A. McP jack at 8.53. - |
| Feb 5 1999 03:29:33:280PM | 990205023 | Jim Terry | Good shot - McP looking at CIV 312 A (see it well). Chromex at 5800 A(marginal identification of 5801 A and 5812 A doublet. McP jack at 14.17. - |
| Feb 5 1999 03:49:18:793PM | 990205024 | Jim Terry | Good shot - McP looking at CIV 312 A (see it well). Chromex at 5800 A(marginal identification of 5801 A and 5812 A doublet). McP jack at 14.75. - |
| Feb 5 1999 04:13:24:590PM | 990205025 | Jim Terry | Good shot - McP looking at He 243 and 256 A. Chromex at 4686 A. McP jack at 14.75. - |
| Feb 5 1999 04:37:19:670PM | 990205026 | Jim Terry | Good shot - McP HV tripped. Chromex at 4686 A. McP jack at 14.75. - |
| Feb 5 1999 04:43:24:000PM | 990205027 | Jim Terry | Good shot - McP HV looking at 1640 A (saw it). Chromex at 4686 A. McP jack at 14.75. - |
| Feb 5 1999 05:14:11:750PM | 990205028 | Jim Terry | Disrupted at 0.888 s McP HV looking at 1640 A (saw it). Chromex at 4686 A. McP jack at 14.75. - |
| Physics Operator Comments | |||
| Feb 5 1999 08:22:57:543AM | Joseph Snipes | Engineering Setup for Friday 990205 Load from 990203015 Overnight ECDC in D2 TF under hybrid control Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid enabled fill B-side upper with 10 psi of He4 Hybrid enabled fill C-side with 30 psi of D2 Hybrid enabled The following gate valves should be enabled, assuming no vacuum problems: ECE VUV Start with shot 990203015, with same Ar puff, but with additional He puff starting at 0.7 s. This puff should increase NL_04 to ~1.3e20 m^-2. This may have to be fine tuned depending on the signals. Once we agree that this is appropriate for the HIREX, the McPherson, and the Chromex spectrometers, we will keep the shot essentially constant for the rest of the run. | |
| Feb 8 1999 02:57:56:530PM | Robert Granetz | Engineering Setup for Tuesday, 990209: Load from 990205027 Overnight ECDC in D2 TF under hybrid control Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid enabled fill B-side upper with 20 psi of He4 Hybrid enabled fill C-side with 30 psi of D2 Hybrid enabled The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV | |
| Feb 8 1999 02:58:43:140PM | Robert Granetz | Run Plan for 990209: ------------------------------------------------------------------------------- Start with shot 990205027, with same Ar and He valve programming, but with twice the pressure in the He plenum. Once we agree that this is appropriate for the HIREX, the McPherson, and the Chromex spectrometers, we will keep the shot essentially constant for the rest of the run. | |
| Feb 5 1999 08:54:59:640AM | 990205001 | Joseph Snipes | Shot 1: Copied shot 990203015 and added a He4 puff at 100 V from 0.7 to 0.9 sec Test shot to correct TMX error, no power supplies. |
| Feb 5 1999 09:00:25:890AM | 990205002 | Joseph Snipes | Shot 2: Only 3 power supplies fired. Others were off due to a setup problem. |
| Feb 5 1999 09:29:54:467AM | 990205004 | Joseph Snipes | Shot 3: Good shot. |
| Feb 5 1999 09:30:09:623AM | 990205004 | Joseph Snipes | Shot 4: Repeat. Good shot. |
| Feb 5 1999 10:05:05:700AM | 990205005 | Joseph Snipes | Shot 5: Added 5 msec to Ar puff, now from 0.30 - 0.336 sec. Changed density feedback wire to TCI NL04 from the Zmeter. Good shot. |
| Feb 5 1999 10:03:44:233AM | 990205006 | Joseph Snipes | Shot 6: He4 puff starting at 0.65 instead of 0.7 and stopping at 0.9 sec. Good shot. |
| Feb 5 1999 10:24:12:390AM | 990205007 | Joseph Snipes | Shot 7: Modified rampdown to reduce the elongation after 1.2 sec and push the plasma against the inner wall to help pumpout the density before the current gets too low to sustain the density. Disrupted at 0.62 sec due to a Moly brick. |
| Feb 5 1999 10:40:18:107AM | 990205008 | Joseph Snipes | Shot 8: Try again with no changes. Good shot. Rampdown a little longer. |
| Feb 5 1999 10:59:37:590AM | 990205009 | Joseph Snipes | Shot 9: Modified the rampdown a little more to try to push the plasma against the inner wall after 1.2 sec and reduce the elongation. Good shot. Rampdown is not as good however. Disrupted at 1.3 sec. |
| Feb 5 1999 11:25:19:840AM | 990205010 | Joseph Snipes | Shot 10: Modified the rampdown again to try to keep the plasma elongated a little longer into the rampdown to maintain a larger plasma while the current is still relatively high. Good shot. Rampdown until about 1.37 sec when it disrupted at about 0.5 MA. |
| Feb 5 1999 11:49:43:000AM | 990205011 | Joseph Snipes | Shot 11: Modified rampdown a bit to try not to push the plasma against the wall so strongly after 1.2 sec. Made more gradual changes in RCUR and CLEARIN after 1.2 sec. Good shot. |
| Feb 5 1999 11:54:34:090AM | 990205012 | Joseph Snipes | Shot 12: Repeat. Good shot. |
| Feb 5 1999 12:18:32:983PM | 990205013 | Joseph Snipes | Shot 13: Modified rampdown again to try to maintain a large elongated plasma well into the rampdown. Modified RCUR and CLEARIN to nearly maintain the plasma shape well into the rampdown. Good shot. |
| Feb 5 1999 12:48:26:310PM | 990205014 | Joseph Snipes | Shot 14: Short cell opening to open up a cooling valve. Modified rampdown again slightly. The plasma moves up well before the disruption on the previous shots though ZCUR is programmed to be flat. Try keeping ZXU and ZXL constant through the rampdown. Good shot. |
| Feb 5 1999 01:06:07:500PM | 990205015 | Joseph Snipes | Shot 15: J.T. went in to check something. Modified rampdown once again moving RXU and RXL inward during the rampdown. Maybe the strike point in the lower divertor is moving across some loaded surfaces and releasing more gas into the plasma during rampdown. Good shot. |
| Feb 5 1999 01:21:17:670PM | 990205016 | Joseph Snipes | Shot 16: Modified rampdown again to keep CLEARIN and RCUR constant out to 1.5 sec. Good shot. |
| Feb 5 1999 01:31:38:373PM | 990205017 | Joseph Snipes | Shot 17: Moved RXL in by 3 cm after 1.2 sec to try to improve the rampdown. Good shot. Rampdown looks better. Disrupts at 1.48 sec. |
| Feb 5 1999 01:41:12:513PM | 990205017 | Joseph Snipes | Shot 17: Moved RXL in by 3 cm after 1.2 sec to try to improve the rampdown. Good shot. Rampdown looks better. Disrupts at 1.48 sec. |
| Feb 5 1999 01:57:26:107PM | 990205018 | Joseph Snipes | Shot 18: Modified rampdown some more moving RXU in after 1.2 sec and moving ZXU and ZXL in toward the plasma center after 1.2 sec, which they were doing anyway without programming them. Good shot. |
| Feb 5 1999 02:17:24:340PM | 990205019 | Joseph Snipes | Shot 19: Modified rampdown again moving CLEARIN and RCUR in by 0.5 - 1 cm after 1.2 sec and some more tweaks on the X point locations. Disrupted at 0.27 sec without clear precursors, probably a brick, though Rice sees nothing on the HIREX signals. It was not vertically unstable. |
| Feb 5 1999 02:25:02:560PM | 990205020 | Joseph Snipes | Shot 20: Try again. Fizzle! |
| Feb 5 1999 02:55:04:107PM | 990205020 | Joseph Snipes | Shot 20: Try again. Disrupted at 0.13 sec. |
| Feb 5 1999 02:55:28:170PM | 990205021 | Joseph Snipes | Shot 21: Repeat. Good shot. Good rampdown past 1.5 sec. |
| Feb 5 1999 03:09:28:043PM | 990205022 | Joseph Snipes | Shot 22: Modified rampdown a bit more reducing RCUR and CLEARIN to reduce the inner gap by another 0.5 cm and moved in RXL and RXU by another 1 cm after 1.2 sec. Good shot. Rampdown not as good as shot 21. |
| Feb 5 1999 03:23:35:420PM | 990205023 | Joseph Snipes | Shot 23: Copied shot 990205021 and then modified CLEARIN and RCUR only after 1.4 sec to try to make the rampdown last still longer. Good shot, rampdown better than shot 21 out to 1.52 sec. |
| Feb 5 1999 03:48:36:560PM | 990205024 | Joseph Snipes | Shot 24: Modified rampdown again past 1.4 sec to try to make the rampdown last longer still. Moved X points further in radially and vertically. Good shot. Rampdown not quite as good as 23. |
| Feb 5 1999 03:58:44:030PM | 990205025 | Joseph Snipes | Shot 25: Returned to rampdown of shot 990205023 then modified rampdown after 1.4 sec to try to force ZCUR down by 1 cm when it is trying to go up. Good shot. Rampdown lasts to 1.5 sec. |
| Feb 5 1999 04:28:58:687PM | 990205026 | Joseph Snipes | Shot 26: Modified rampdown again moving X points in radially and vertically after 1.4 sec. Also moved CLEARIN and RCUR in a bit after 1.4 sec. Good shot. Rampdown until 1.51 sec. |
| Feb 5 1999 04:50:16:233PM | 990205027 | Joseph Snipes | Shot 27: Modified rampdown again moving ZCUR down another 1 cm after 1.4 sec to attempt to compensate for the plasmas upward motion. Good shot. Rampdown the same. |
| Feb 5 1999 04:57:59:123PM | 990205028 | Joseph Snipes | Shot 28: Increased EF4U current after 1.25 sec to try to keep it away from cross-over at the disruption. Disrupted at 0.89 sec. There was also a bite out of the current around 0.4 sec. |
| Feb 5 1999 05:00:48:000PM | 990205028 | Joseph Snipes | Shot 28: There was an intentional impurity injection (Au) at 0.25 sec. |
| Feb 8 1999 09:31:22:090AM | 990205028 | Joseph Snipes | Overall, it was a very good run. We got 26 plasmas out of 28 shots. The first two were "engineering test shots". Of the plasmas, four disrupted before ramp down and all of the others disrupted in rampdown. So, there were 22 useful full length discharges. J. T. will finish the calibrations on Tuesday. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:45:42:340AM | Plasma | Ok | o22 comm bank no charge p.s. off |
| 2 | 08:55:40:090AM | Plasma | Ok | control panel did not turn all supplies on |
| 3 | 09:02:59:437AM | Plasma | Ok | no faults/plasma |
| 4 | 09:21:19:623AM | Plasma | Ok | no faults/plasma |
| 5 | 09:42:35:060AM | Plasma | Ok | no faults/plasma |
| 6 | 09:59:42:590AM | Plasma | Ok | no faults/plasma |
| 7 | 10:17:24:013AM | Plasma | Ok | no faults/plasma |
| 8 | 10:35:38:653AM | Plasma | Ok | no faults/plasma |
| 9 | 10:56:12:623AM | Plasma | Ok | no faults/plasma |
| 10 | 11:15:12:543AM | Plasma | Ok | no faults/plasma |
| 11 | 11:34:25:543AM | Plasma | Ok | no faults |
| 12 | 11:53:08:217AM | Plasma | Ok | no faults |
| 13 | 12:14:01:810PM | Plasma | Ok | no faults/plasma |
| 14 | 12:32:06:293PM | Plasma | Ok | no faults/plasma |
| 15 | 12:51:05:310PM | Plasma | Ok | no faults |
| 16 | 01:09:35:670PM | Plasma | Ok | no faults/plasma |
| 17 | 01:27:41:000PM | Plasma | Ok | no faults/plasma |
| 18 | 01:46:32:200PM | Plasma | Ok | no faults/plasma |
| 19 | 02:05:06:030PM | Plasma | Ok | no faults/fizzel |
| 20 | 02:23:20:543PM | Plasma | Ok | no faults/plasma |
| 21 | 02:39:20:810PM | Plasma | Ok | no faults/plasma |
| 22 | 02:57:22:060PM | Plasma | Ok | no faults/plasma |
| 23 | 03:15:26:263PM | Plasma | Ok | no faults/plasma |
| 24 | 03:36:53:950PM | Plasma | Ok | no faults/plasma |
| 25 | 03:55:45:357PM | Plasma | Ok | no faults/plasma |
| 26 | 04:15:26:357PM | Plasma | Ok | no faults/plasma |
| 27 | 04:34:53:340PM | Plasma | Ok | no faults |
| 28 | 04:54:24:403PM | Plasma | Ok | no faults/plasma |