| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Bruce Lipschultz,Bruce Lipschultz |
| Physics operator(s): | Ron Parker |
| Engineering operator(s): | Gary Dekow,Bill Cochran |
| Engineering Operator Run Comment |
| MP 268 ICRF Commissioning and MP 225 Impurity Screening. Wukitch/Lipsch |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:24:493PM |
| Author: To Be Determined |
| PO - Parker EO - Cochrane SL - Wukitch/Lipschultz The primary goal of today's run is to evaluate the effect of changes made in the J-Port antenna. The 2 outer straps were shorted to ground and the inner 2 straps will be operated as a single 2-strap antenna. The idea is that most of the parasitic loading, which the RF group thinks is leading to the reduced power coupled to the plasma, is due to power launched at the back of the antenna at the high voltage regions associated with the 2 outer straps. The evaluation of the antenna performance will include a number of steps, which must be dealt with around the fact that there is a review of the potential changes for the J-port antenna. This review will be ocurring in parallel with the run and so the order of occurrence may vary from the shot plan posted. ------------------------------------------------------------------------------- Run plan: For first plasma shot, load from 1000512016 (1 MA, 5.2 T) Most shots will be inner wall limited. 1. Emissive probe comparison right gap 2 cm, nl_01~1.2 staircase RF power as shot (2 shots) like 1000512016 2. Sources/core impurity comparison staircase RF power like 1000512016 (3 shots) 3. Perform Power ramp [1-250 kW/each] for loading studies. at ~0.5, 1.0, 1.5, 2. cm right gap (5 shots) like shot 1000614004 4. Pabs measurement at right gap of 1.5 cm for each antenna (2 shots) like shot 1000614013 5. Emissive probe comparison current scan Ip=[0.6,.8,1.2] (3 shots) ------------------------------------------------------------------------------- shot 1: shot went with some difficulty in current rise. D and E fired, but not J. plasma innner wall limited D and En were flawless J was mistuned next shot: retune J and repeat shot 2: Repeat of 1. Stll no J power. plasma innner wall limited D and E were flawless J was mistuned next shot: retune J and repeat shot 3: no changes - still no J port plasma innner wall limited D and E were flawless J was mistuned next shot: retune J and repeat shot 4: some amount of J-port power this time. They can now attempt to tune it. plasma innner wall limited D and E were flawless J much better next shot: retune J and repeat shot 5: 0.8 MW on J. Tuning to continue. plasma innner wall limited D and E were flawless J much better next shot: retune J and repeat shot 6: fizzle shot 7: SOme arcs on J, still tuning. plasma innner wall limited D and E were flawless J much better next shot: retune J and repeat shot 8: fizzle shot 9: still limited power on J-port - 1 MW. Transmitter issues. plasma - J-port is matched, but power limited 2 cm right gap shot 10: J-port limited to 900 kW. So this shot switched over to power ramps to get the loading resistance plasma 2 cm right gap 250 kW ramps from all three next shot: 1.5 cm right gap shot 11: fizzle shot 12: power ramps, outer gap at 1.5 cm 012 plasma 1.5 cm right gap 250 kW ramps from all three next shot: 1.5 cm right gap shot 13: fizzle shot 14: power ramp, outer gap = 1. cm shot 15: OH test shot 16: fizzle shot 17: ok shot. J, D and E at 1 MW each square wave 300 ms each. This is to determine the heating efficiency of each antenna by looking at the Te decay at shutoff. This shot was inner wall limited and 1.5 cm outer gap. Neutrons from each seem similar which would indicate that the antenna change to J has helped. plasma right gap ~1.5 cm good shot D,E and J - PABS calc next shot: repeat shot 18: fizzle shot 19: a repeat of 17 to look at power absorption. Summary: We completed part of this run. J-port began slowly (had difficulty finding a good match) but 017 suggests that as a dipole J-port heats approximately as well as D and E according to central Te and neutrons. Further analysis will analyze Pabs from stored magnetic energy. This suggests that properly grounding the antenna box and shielding the feed straps should improve the 4-strap configuration. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:11:427PM |
| Author: To Be Determined |
| Run Plan and Engineering Setup for 1000621 MP 268: ICRF Commissioning MP 225: Impurity Screening Session Leader: S. Wukitch/B. Lipschultz Physics Operator: R. Parker Engineering Operators: G. Dekow/B. Cochran --------------------------------------------------------------------- Engineering Setup: ECDC in D2, stopping 1-2 hours before run. Run begins at 9:00 and ends at 17:00. Power system setup: Same as for 1000616001 Set OH1, OH2U and OH2L fizzle delays at 300ms Set TF fizzle delay at 400 ms Gas setup: B-Top 6 psi D2 Hybrid Enabled B-side lower 1 psi Argon Hybrid DISABLED ** B-side upper 2 psi Krypton Hybrid DISABLED ** NOTE!! C-side 30 psi D2 Hybrid Enabled J-bottom leave as is Hybrid DISABLED The following Gate Valves should be ENABLED, assuming no vacuum problems: ECE, VUV, HIREXjr ------------------------------------------------------------------- Run Plan: For first shot, load from 1000512016 (1 MA, 5.2 T) Most shots will be inner wall limited 1. Emissive probe comparison, right gap ~2 cm, nl_04 ~ 1.0 Staircase RF power. Similar to shot 1000512016 (2 Shots) 2. Sources/core impurity comparison. Staircase RF power, with shot similar to 1000512016 (3 Shots) 3. Perform Power Ramp Studies (1-250 kW each) for loading studies, with right gap at ~0.5, 1.0, 1.5, 2.0 cm. Similar to shot 1000614004 (5 Shots) 4. Pabs measurement with right gap set at 1.5 cm for each antenna. Shot similar to 1000614013 5. Emissive probe comparison scan. Ip=0.6, 0.8, 1.2 MA. (3 Shots). ----------------------------------------------------------- RUN SUMMARY A very frustrating run with many fizzles. Nevertheless some useful data were obtained. All shots except the last were limited in order to avoid changes in loading due to onset of H mode. The first 9 shots were patterned after 1000512016 and, except for minor tuning of the startup phase, were identical. The first 5 shots ran perfectly, lulling the Physop into thinking this would be an easy day. However, shot 6 fizzled, shot 7 ran as programmed, and shot 8 fizzled again, followed by a normal shot 9. At this point, shot 1000614004 was loaded to check RF loading as a function of right gap. The pattern of every other shot fizzling (sp?) continued. Even so useful data were produced on the comparison of D and E antennas with the reconfigured J port antenna. On shot 16, a problem developed during the countdown with the OH 1 power supply, causing a 1 hour delay. Apparently, the problem fixed itself. Shot 17 ran as programmed, but shot 18 was a dud. At this point, Steve Wolfe noticed a strong 28 peak on the RGA and we suspected a leak, a suspicion that was confirmed after the run. The last 2 shots, 19 and 20 ran as programmed, with shot 20 being diverted at the request of B. Lipschultz. It was noted that on shot 20, the BZ(0) was 0, to within measurement accuracy, but was about 1 mT on some of the fizzles. Thus variability in the BZ null could, in addition to the effects of the leak, have caused the large number of fizzles (5) and the one dud. As mentioned, the leak was confirmed and traced to F port, due to inadequate heating of the seal. Hopefully it will not be a problem for the rest of the campaign. One should also keep an eye on the BZ null variability, presumably connected with differential cooling of the upper and lower coils. |
| Session Leader Comments | |||
| Jun 21 2000 09:02:54:827AM | Bruce Lipschultz | PO - Parker EO - Cochrane SL - Wukitch/Lipschultz The primary goal of today's run is to evaluate the effect of changes made in the J-Port antenna. The 2 outer straps were shorted to ground and the inner 2 straps will be operated as a single 2-strap antenna. The idea is that most of the parasitic loading, which the RF group thinks is leading to the reduced power coupled to the plasma, is due to power launched at the back of the antenna at the high voltage regions associated with the 2 outer straps. The evaluation of the antenna performance will include a number of steps, which must be dealt with around the fact that there is a review of the potential changes for the J-port antenna. This review will be ocurring in parallel with the run and so the order of occurrence may vary from the shot plan posted. | |
| Jun 21 2000 09:34:51:077AM | 1000621001 | Bruce Lipschultz | shot 1: shot went with some difficulty in current rise. D and E fired, but not J. |
| Jun 21 2000 09:51:41:793AM | 1000621002 | Bruce Lipschultz | shot 2: Repeat of 1. Stll no J power. |
| Jun 21 2000 10:09:21:310AM | 1000621003 | Bruce Lipschultz | shot 3: no changes - still no J port |
| Jun 21 2000 10:48:07:717AM | 1000621004 | Bruce Lipschultz | shot 4: some amount of J-port power this time. They can now attempt to tune it. |
| Jun 21 2000 10:48:24:890AM | 1000621004 | Bruce Lipschultz | shot 4: some amount of J-port power this time. They can now attempt to tune it. |
| Jun 21 2000 11:09:00:763AM | 1000621005 | Bruce Lipschultz | shot 5: 0.8 MW on J. Tuning to continue. |
| Jun 21 2000 11:21:31:263AM | 1000621006 | Bruce Lipschultz | shot 6: fizzle |
| Jun 21 2000 11:51:47:217AM | 1000621007 | Bruce Lipschultz | shot 7: SOme arcs on J, still tuning. |
| Jun 21 2000 12:08:35:530PM | 1000621008 | Bruce Lipschultz | shot 8: fizzle |
| Jun 21 2000 12:30:05:497PM | 1000621009 | Bruce Lipschultz | shot 9: still limited power on J-port - 1 MW. Transmitter issues. |
| Jun 21 2000 12:30:16:653PM | 1000621009 | Bruce Lipschultz | shot 9: still limited power on J-port - 1 MW. Transmitter issues. |
| Jun 21 2000 02:20:12:310PM | 1000621010 | Bruce Lipschultz | shot 10: J-port limited to 900 kW. So this shot switched over to power ramps to get the loading resistance |
| Jun 21 2000 02:20:44:343PM | 1000621011 | Bruce Lipschultz | shot 11: fizzle |
| Jun 21 2000 02:22:16:763PM | 1000621012 | Bruce Lipschultz | shot 12: power ramps, outer gap at 1.5 cm |
| Jun 21 2000 02:22:26:030PM | 1000621013 | Bruce Lipschultz | shot 13: fizzle |
| Jun 21 2000 02:23:10:903PM | 1000621014 | Bruce Lipschultz | shot 14: power ramp, outer gap = 1. cm |
| Jun 21 2000 02:43:27:480PM | 1000621015 | Bruce Lipschultz | shot 15: OH test |
| Jun 21 2000 04:03:48:857PM | 1000621016 | Bruce Lipschultz | shot 16: fizzle |
| Jun 21 2000 04:13:29:967PM | 1000621017 | Bruce Lipschultz | shot 17: ok shot. J, D and E at 1 MW each square wave 300 ms each. This is to determine the heating efficiency of each antenna by looking at the Te decay at shutoff. This shot was inner wall limited and 1.5 cm outer gap. Neutrons from each seem similar which would indicate that the antenna change to J has helped. |
| Jun 21 2000 04:34:50:077PM | 1000621018 | Bruce Lipschultz | shot 18: fizzle |
| Jun 21 2000 04:53:01:530PM | 1000621019 | Bruce Lipschultz | shot 19: a repeat of 17 to look at power absorption. |
| Physics Operator Comments | |||
| Jun 21 2000 09:38:43:263AM | 1000621001 | Ron Parker | Shot 1 was programmed from shot 1000516001. It ran as programmed but with a somewhat erratic startup. Fill pressure and BZ(0) will be tuned for next shot. |
| Jun 21 2000 09:36:23:593AM | 1000621002 | Ron Parker | Shot 2 was a repeat of shot 1, with some tuning of the startup. Initial fill pulse was extended by 2 msec to 20 msec and IC4 was decreased by 10 A to -1290. |
| Jun 21 2000 10:11:13:750AM | 1000621003 | Ron Parker | Shot 3 was another repeat -- no changes from shot 2. Startup still erratic around crossover. SW points out that current rise is exceeding programmed waveform, which may cause the hesitations in the current rise. For next shot, the demand for Ip will be increased. Also, clearin decreased by a few mm. |
| Jun 21 2000 10:49:51:403AM | 1000621004 | Ron Parker | Shot 4 was again a repeat, with the changes noted in the entry for the last shot. Current rise was improved as a result of setting the demand closer to the actual early rate of rise. I/B seems to be getting a little higher in the early phase, so EF4 current increased by 10 A to -1280. Problem noted with Ross relay in power room, requiring power room entry. 15 minute delay as a result. No changes for next shot. |
| Jun 21 2000 11:30:22:123AM | 1000621005 | Ron Parker | Shot 5 ran as programmed. Current rise still a little erratic, with demand running behind actual. Demand will be increased slightly on next shot. Breakdown and startup look good. Next shot: no changes, except as noted above. |
| Jun 21 2000 11:31:47:030AM | 1000621006 | Ron Parker | Shot 6 was a fizzle, with slower current rise than earlier shots. Next shot: pulse gas fill increased by 2 msec to 22 msec. |
| Jun 21 2000 11:49:44:293AM | 1000621007 | Ron Parker | Plasma came back, but breakdown is still slower than in earlier shots. No change for next shot. |
| Jun 21 2000 12:04:18:280PM | 1000621008 | Ron Parker | Shot 8 was again a fizzle. Breakdown is ~1 msec late and current rise hesitates. For next shot, decrease EF4 current from 1280 to 1290 A. |
| Jun 21 2000 12:52:11:123PM | 1000621009 | Ron Parker | Shot came back as initial breakdown occurred at 6.5 msec, compared to 7.7 msec on last shot which fizzled. Power room and cell access. 25 minute delay for RF deliberations and access to power room. |
| Jun 21 2000 01:05:43:780PM | 1000621010 | Ron Parker | Shot 1000614004 was loaded for this shot, and ran as programmed. We are now varying the right gap, beginning with 2 cm on this shot. Next shot: similar, but right gap should be 1.5 cm (RCUR increasd by 3 mm). |
| Jun 21 2000 01:27:56:763PM | 1000621011 | Ron Parker | Another fizzle! Too much gas? Next shot will have the fill pulse reduced in duration from 25 to 20 msec. Note: Fill pulse should have been reduced when shot 1000614004 was loaded. |
| Jun 21 2000 01:43:00:730PM | 1000621012 | Ron Parker | Shot ran with right gap at ~ 1.4 cm. Initial fill pressure dropped to ~0.042 mT and initial breakdown and current rise were good. Next shot: right gap set for ~ 1 cm. No change in startup conditions. |
| Jun 21 2000 02:03:42:560PM | 1000621013 | Ron Parker | Another fizzle--every other shot! Why? Try a little less EF4 current at -1295 A. |
| Jun 21 2000 02:31:51:763PM | 1000621014 | Ron Parker | This shot ran as programmed, EF4 current at -1295 A. Next shot: Right gap set @ 1.4 cm (as in shot 12) Shot interrupted due to OH 1 power supply problem -- type 3 fault. Count down continued, but no shot. |
| Jun 21 2000 02:30:59:247PM | 1000621015 | Ron Parker | Shot 15 was interrupted due to OH 1 fault. Power room entry to check problem. |
| Jun 21 2000 03:51:19:640PM | 1000621016 | Ron Parker | Shot 16 was another fizzle. 1 hour delay due to OH 1 problem. |
| Jun 21 2000 04:09:21:230PM | 1000621017 | Ron Parker | Shot 17 ran with a few small tunes on the startup: 1 msec more gas, from 20 to 21 msec, and decreased BR offset from .00035 to 0.00025. No changes for next shot. |
| Jun 21 2000 04:36:52:047PM | 1000621018 | Ron Parker | This shot was a dud. No apparent reason as far as field null is concerned. There is a strong 28 peak on RGA which suggests possibility of a leak. Also 32 peak is present and dies after each fizzle, rising after each shot. Gas pulse increased for next shot by 2 msec. |
| Jun 21 2000 05:02:42:437PM | 1000621019 | Ron Parker | Shot 19 ran as programmed. Breakdown is still a little late -- 6.6 msec on z meter. Pressure is also still a bit low, 0.04 mT. Last shot coming up, and will be programmed to be diverted. We continue to suspect a leak. |
| Jun 21 2000 05:23:02:280PM | 1000621020 | Ron Parker | Shot ran as programmed, no fizzle. Surprising was the BZ trace, essentially zero although on shot 16, with identical settings of EF4, it was about 1 mT -- and 16 was a fizzle. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:08:34:950AM | Plasma | Ok | |
| 2 | 09:31:58:873AM | Plasma | Ok | |
| 3 | 09:50:57:327AM | Plasma | Ok | |
| 4 | 10:15:16:903AM | Plasma | Ok | |
| 5 | 10:49:20:577AM | Plasma | Ok | |
| 6 | 11:10:40:920AM | Plasma | Ok | |
| 7 | 11:32:23:123AM | Plasma | Ok | |
| 8 | 11:52:58:530AM | Plasma | Ok | |
| 9 | 12:08:31:873PM | Plasma | Ok | |
| 10 | 12:52:46:687PM | Plasma | Ok | |
| 11 | 01:10:39:200PM | Plasma | Ok | |
| 12 | 01:26:40:937PM | Plasma | Ok | |
| 13 | 01:46:37:403PM | Plasma | Ok | |
| 14 | 02:03:56:933PM | Plasma | Ok | |
| 15 | 02:23:41:593PM | Plasma | Bad | OH1 Type 3 Flt during Init, shot aborted. |
| 16 | 03:32:54:297PM | Plasma | Ok | |
| 17 | 03:50:45:937PM | Plasma | Ok | |
| 18 | 04:18:14:343PM | Plasma | Ok | |
| 19 | 04:37:50:153PM | Plasma | Ok | |
| 20 | 05:02:04:153PM | Plasma | Ok | |