| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Spencer Pitcher |
| Physics operator(s): | Dmitri Mossessian |
| Engineering operator(s): | Frank Silva |
| Engineering Operator Run Comment |
| MP230 Divertor Baffling/Pitcher/Silva |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:19:930PM |
| Author: To Be Determined |
| Run Summary for 990303 /continued from 990302 MP 230 Effect of Divertor Baffling on Confinement, Thresholds and the ELM-free/EDA Boundary Session Leader: S Pitcher Phys Op : D Mossessian Purpose: The purpose of this experiment was to investigate the effect of divertor baffling on confinement, H-mode thresholds and the ELM-free/EDA boundary. Conditions in the pedestal/edge region were carefully monitored. Summary: The machine ran somewhat better today after the boronization last night, in comparison to yesterday. We ran alternate shots, flapper closed and then open. With only 1.5 MW of RF, we got multiple EDA's in a single discharge, which made shot to shot comparisons difficult. Nevertheless, it was clear that divertor neutral pressure was approx a factor of 2 lower with flapper open, midplane pressure and H-alpha were not affected, Wmhd not affected. The following conditions were investigated: (1) target nl04 = 1.0, 1.5 MW (eg. cf shots 7,8) (2) target nl04 = 0.7, 1.5 MW (eg. cf shots 15,16) (3) target nl04 = 1.5, 1.5 MW (eg. cf shots 20,21) From shot 22, we attemped to investigate the effect of the flapper on threshold, but RF had problems. This was not done. Conclusion: It is becoming fairly clear that the flapper does not influence midplane pressures or Halpha, or confinement, although we are still looking for truly steady reproducible EDA's with flapper open/closed, ie trophy shots. Again, divertor pressures are reduced by a factor of 2 with the flapper open. Still not clear regarding the effect on thresholds.....remains to be done. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:00:537PM |
| Author: To Be Determined |
| Run summary for 990303 SL: S. Pitcher PO: D. Mossessian The run was in support of MP 230 - Effect of divertor baffling on confinement. thresholds and ELM-free/EDA boundary. Scorecard: 27 shots, 4 fizzles, 23 plasmas. First shot was loaded from 990302019 - 800 kA current, 1.0e20 target density. After 5 plasmas in a row we went in alternating plasma/fizzle mode for shots 6 - 12. For shot 13 the Br0 offset was reduced by 0.5 mT thus producing negative Br0 at t=0 sec and after that there was no more fizzles. On shot 6 the ZCUR was moved down 4 mm to provide for better coverage for edge TS. It was moved down 2 more mm on shot 22. The lower x-point was pulled down 4 mm at 1.2 sec on shot 6 and 3 mm more on shot 22. From shot 4 to shot 22 two Btor bumps were programmed for ECE. The RF broke down on shot 25 so the last 2 shots were programmed for density ramp up to 1.7e20. Shot 26 had density ramped up to 1.5e20, but next shot was a fizzle. |
| Session Leader Comments | |||
| Mar 3 1999 09:10:42:983AM | 990303001 | Spencer Pitcher | flapper open, t = -.2 s to t = 1.5 s |
| Mar 3 1999 09:11:08:217AM | 990303002 | Spencer Pitcher | flapper closed |
| Mar 3 1999 09:22:00:310AM | 990303003 | Spencer Pitcher | flapper closed |
| Mar 3 1999 09:32:12:950AM | 990303004 | Spencer Pitcher | flapper open whole shot |
| Mar 3 1999 09:56:26:763AM | 990303005 | Spencer Pitcher | flapper open whole shot |
| Mar 3 1999 10:02:43:340AM | 990303006 | Spencer Pitcher | flapper closed whole shot |
| Mar 3 1999 10:43:15:857AM | 990303007 | Spencer Pitcher | flapper closed whole shot |
| Mar 3 1999 10:43:35:920AM | 990303008 | Spencer Pitcher | flapper open whole shot |
| Mar 3 1999 11:10:04:373AM | 990303009 | Spencer Pitcher | flapper open whole shot argon enabled |
| Mar 3 1999 11:43:53:623AM | 990303010 | Spencer Pitcher | flapper open whole shot argon enabled......gave too much....radiation too high!! EDA not very good |
| Mar 3 1999 11:45:02:530AM | 990303011 | Spencer Pitcher | flapper open whole shot argon enabled......reduce by approx factor 4 |
| Mar 3 1999 12:11:06:793PM | 990303012 | Spencer Pitcher | flapper open whole shot argon enabled......reduce by approx factor 4 |
| Mar 3 1999 12:19:41:937PM | 990303013 | Spencer Pitcher | flapper closed whole shot argon enabled |
| Mar 3 1999 12:47:11:437PM | 990303014 | Spencer Pitcher | flapper open whole shot argon enabled, but dropped to 15 ms target density dropped to nl04 0.7 |
| Mar 3 1999 01:01:40:450PM | 990303015 | Spencer Pitcher | flapper closed whole shot argon enabled, argon 15 ms target density nl04 = 0.7 |
| Mar 3 1999 01:22:48:670PM | 990303016 | Spencer Pitcher | flapper open whole shot argon disabled target density nl04 = 0.7 |
| Mar 3 1999 01:46:06:670PM | 990303017 | Spencer Pitcher | flapper closed whole shot argon disabled target density nl04 = 1.5 |
| Mar 3 1999 02:03:08:780PM | 990303018 | Spencer Pitcher | flapper closed whole shot argon disabled target density nl04 = 1.5 |
| Mar 3 1999 02:26:20:390PM | 990303019 | Spencer Pitcher | flapper open whole shot argon disabled target density nl04 = 1.5 |
| Mar 3 1999 02:46:16:043PM | 990303020 | Spencer Pitcher | flapper open whole shot argon enabled: 15 ms target density nl04 = 1.5 |
| Mar 3 1999 03:02:09:170PM | 990303021 | Spencer Pitcher | flapper closed whole shot argon enabled...increase to : 20 ms target density nl04 = 1.5 |
| Mar 3 1999 03:38:03:780PM | 990303022 | Spencer Pitcher | Threshold study: flapper closed whole shot argon disabled RF ramp from 0.5 MW at t = 0.5 s to 1.5 MW at t = 1.2 s nl04 = 1.0 Pthresh = 0.88 MW |
| Mar 3 1999 04:04:54:090PM | 990303023 | Spencer Pitcher | Threshold study: flapper open whole shot argon disabled RF ramp from 0.5 MW at t = 0.5 s to 1.5 MW at t = 1.2 s nl04 = 1.0 RF matching changed for this shot! |
| Mar 3 1999 04:13:00:590PM | 990303024 | Spencer Pitcher | Threshold study: flapper open whole shot argon disabled change >> RF ramp from 0.5 MW at t = 0.5 s to 1.5 MW at t = 1.0 s and then flat nl04 = 1.0 RF matching put back as in shot 22 Pthresh = 1.06 MW |
| Mar 3 1999 04:47:45:810PM | 990303026 | Spencer Pitcher | RF ist kaput! Ohmic density ramp flapper open whole shot argon not enabled! |
| Mar 3 1999 04:51:48:250PM | 990303027 | Spencer Pitcher | Ohmic density ramp flapper closed whole shot argon not enabled! |
| Physics Operator Comments | |||
| Mar 3 1999 08:28:45:233AM | Dmitri Mossessian | Load from 990302019 - 800 kA, 1.0e20 density. PCS coldstart OK. | |
| Mar 3 1999 08:56:23:513AM | 990303001 | Dmitri Mossessian | Plasma. No RF. |
| Mar 3 1999 09:15:12:500AM | 990303002 | Dmitri Mossessian | RF should be on this time. No PCS changes. PLasma. RF is on, ELM-free H-mode. |
| Mar 3 1999 09:32:39:780AM | 990303003 | Dmitri Mossessian | No PCS changes. PLasma - 2 EDA H-modes |
| Mar 3 1999 09:55:45:827AM | 990303004 | Dmitri Mossessian | Added 7 kA Btor bump from 0.8 to .893 sec for ECE scan. Plasma, h-modes. |
| Mar 3 1999 10:09:59:030AM | 990303005 | Dmitri Mossessian | No PCS changes Plasma |
| Mar 3 1999 10:19:29:310AM | 990303006 | Dmitri Mossessian | Moved ZXL 4 mm down at 1.22 sec. Moved ZCUR 4 mm down from .5 to 1.3 sec Fizzle |
| Mar 3 1999 10:44:08:890AM | 990303007 | Dmitri Mossessian | Add another B-tor bump for ECE at 0.55 sec. No startup changes. Plasma, long EDA |
| Mar 3 1999 11:02:15:857AM | 990303008 | Dmitri Mossessian | No PCS changes. Plasma. |
| Mar 3 1999 11:17:12:280AM | 990303009 | Dmitri Mossessian | No PCS changes. Enable Argon valve. Fizzle. Probably did not wait long enough for base pressure to come down. |
| Mar 3 1999 11:40:38:187AM | 990303010 | Dmitri Mossessian | No PCS changes Plasma |
| Mar 3 1999 12:03:36:140PM | 990303011 | Dmitri Mossessian | Reduced Argon puff to 20 msec (from 30 msec). Fizzle |
| Mar 3 1999 12:17:28:687PM | 990303012 | Dmitri Mossessian | No PCS changes. PLasma |
| Mar 3 1999 12:29:26:327PM | 990303013 | Dmitri Mossessian | Reduced Br0 offset in segment 1 to 0.0015 from 0.002. Plasma |
| Mar 3 1999 12:50:22:013PM | 990303014 | Dmitri Mossessian | Reduced Ar puff to 15 msec. Set Pulse_gas3 0 after 0.239 sec. Density 0.7e20. Plasma. |
| Mar 3 1999 01:07:50:950PM | 990303015 | Dmitri Mossessian | No PCS change. Plasma |
| Mar 3 1999 01:29:47:327PM | 990303016 | Dmitri Mossessian | Add a little more gas in Pulse_gas3 after 0.239 sec. Disable B_side_lower (Ar). Plasma. |
| Mar 3 1999 01:54:21:483PM | 990303017 | Dmitri Mossessian | Density 1.5e20. Add more gas in Pulse_gas3 after .239 sec. Plasma. Did not make it to the target Ne. Increase Pulse_gas3 puff for next shot. |
| Mar 3 1999 02:25:14:000PM | 990303018 | Dmitri Mossessian | Increase Pulse_gas3 puff. PLasma, no RF. |
| Mar 3 1999 02:40:02:263PM | 990303019 | Dmitri Mossessian | No PCS changes. Plasma |
| Mar 3 1999 02:58:26:653PM | 990303020 | Dmitri Mossessian | Enable Ar 15 msec pulse. Plasma |
| Mar 3 1999 03:10:53:840PM | 990303021 | Dmitri Mossessian | 20 msec Ar. Plasma |
| Mar 3 1999 03:32:58:420PM | 990303022 | Dmitri Mossessian | Target density 1.0e20 (lowered Pulse_gas3). Ar disabled. Moved plasma down 2 mm (ZCUR from 0.5 to 1.3 sec) Move ZXL down 3 mm at 1.2 sec. Removed ECE Btor bumps. Plasma |
| Mar 3 1999 03:56:27:500PM | 990303023 | Dmitri Mossessian | No PCS changes. Plasma |
| Mar 3 1999 04:10:16:030PM | 990303024 | Dmitri Mossessian | No PCS changes. Plasma |
| Mar 3 1999 04:37:40:263PM | 990303025 | Dmitri Mossessian | No PCS changes. Plasma |
| Mar 3 1999 04:49:34:983PM | 990303026 | Dmitri Mossessian | Density increasing from 0.6e20 at 0.5 sec to 1.8e20 at 1.2 sec. Plasma. Density went up to 1.5e20. Ar was desabled. |
| Mar 3 1999 05:01:06:640PM | 990303027 | Dmitri Mossessian | No PCS changes. Fizzle. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:48:01:000AM | Plasma | Ok | no faults/plasma |
| 2 | 09:11:17:967AM | Plasma | Ok | no faults/plasma |
| 3 | 09:25:51:483AM | Plasma | Ok | no faults/plasma |
| 4 | 09:43:11:873AM | Plasma | Ok | no faults/plasma |
| 5 | 09:56:54:060AM | Plasma | Ok | no faults/plasma |
| 6 | 10:13:47:857AM | Plasma | Ok | No Faults |
| 7 | 10:37:05:780AM | Plasma | Ok | no faults/plasma |
| 8 | 10:55:14:937AM | Plasma | Ok | no faults/plasma |
| 9 | 11:12:34:357AM | Plasma | Ok | no faults/fizzel |
| 10 | 11:31:16:077AM | Plasma | Ok | no faults/plasma |
| 11 | 11:54:15:187AM | Plasma | Ok | no faults/fizzel |
| 12 | 12:08:20:687PM | Plasma | Ok | no faults |
| 13 | 12:27:46:857PM | Plasma | Ok | no faults |
| 14 | 12:47:42:390PM | Plasma | Ok | no faults/plasma |
| 15 | 01:06:08:983PM | Plasma | Ok | No Faults / Plasma |
| 16 | 01:26:52:780PM | Plasma | Ok | No Faults / Plasma |
| 17 | 01:47:20:373PM | Plasma | Ok | No Faults /Plasma |
| 18 | 02:09:09:903PM | Plasma | Ok | No Faults / Plasma |
| 19 | 02:30:55:107PM | Plasma | Ok | No Faults / Plasma |
| 20 | 02:49:36:513PM | Plasma | Ok | No Faults / Plasma |
| 21 | 03:08:31:500PM | Plasma | Ok | No Faults / Plasma |
| 22 | 03:28:21:170PM | Plasma | Ok | No Faults / Plasma |
| 23 | 03:49:47:327PM | Plasma | Ok | No Faults / Plasma |
| 24 | 04:03:51:500PM | Plasma | Ok | No Faults / Plasma |
| 25 | 04:16:51:077PM | Plasma | Ok | No Faults / Plasma |
| 26 | 04:42:19:937PM | Plasma | Ok | No Faults / Plasma |
| 27 | 04:59:21:500PM | Plasma | Ok | No Faults |