| Miniproposals | ||||||||||||
|
| Operators | |
| Session leader(s): | John Rice,Earl Marmar |
| Physics operator(s): | Ron Parker |
| Engineering operator(s): | Frank Silva |
| Engineering Operator Run Comment |
| MP#237/Parker,Silva |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:21:240PM |
| Author: To Be Determined |
| Run summary for 990916, MP237, Toroidal Rotation during Plasma Current Scan The purpose of this run was to determine the scaling of the rotation velocity with plasma current, for otherwise constant target plasmas, for H-mode discharges. The range of currents achieved was from 0.8 down to .4 MA, however there was only one good shot at .4 MA due to difficulty coupling 2 MW of ICRF power. The run was terminated early due to Floyd's high humidity compromising the RF systems. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:09:300PM |
| Author: To Be Determined |
| RUN SUMMARY 990916 The purpose of the run was to document scaling of toroidal rotation vs plasma current in H-Mode. Although some data were collected, the run fell far short of being an unqualified success. Two problems developed, both related to hurricane Floyd. Because of the high humidity, transmitter 2 developed arcing problems and became inoperable after shot 12. Thereafter only 1 MW was available and this was insufficient to produce the reliable and high quality H-Modes required for the scan. The second problem was concern over difficulties personnel would have leaving PSFC late in the evening as the storm reached its expected intensity. As a result it was dsecided to terminate the run at 3:00PM. After shot 12, E. Marmar became Session Leader, taking over for J. Rice. The purpose of the last 6 shots (shots 13-18) was to study Rf absorption efficiency as a function of H/D ratio. Some difficulty was encountered in significantly raising the H/D ratio using Pulse Gas Valve 2. Although the shots were useful, the range of H/D variation was insufficient and additional shots will have to be devoted to this study in a future run. In spite of these problems, the machine ran exceptionally well with no fizzles and only two disruptions, one occuring when the current was ramped down to 400 kA and the plasma was vertically instable. With some adjustment to shape (by J. Goetz who had spelled R. Parker) the plasma became stable and no further disruptions were encountered. The other disruption occurred due to a OH2 PS fault. A brief rundown of the shots follows: Shots 1-3: Standard 800 kA plasmas, 2 MW RF H-Modes. Shots 4-6: Current ramped down to 600 kA, 2 MW RF H-Modes Shots 7-12: Various attempts to nail down the 400 kA point. Shots 007 and 010 disrupted, as discussed above. RF tripped out on other shots. Finally a good 400 kA shot was obtained in shot 12. Shots 13-18: E. Marmar became Session Leader. (Transmitter 2 out of service.) These shots were all run with ~ 1 MW RF from Trans 1. Current ~ 1 MA. No further problems encountered, except difficulty bringing H/D ratio to interesting levels with pulse valve 2. Run Plan for Thursday 990916 MP#237 Ip Scaling of Rotation Session Leader: J. Rice Physics Operator: R. Parker Setup Power Supplies from Shot 990915007 Two Hours of ECDC in D2 prior to run. Gas setup: Fill B-Top with 6 psi D2, Hybrid Enabled Fill B-side lower with 1 psi Ar, Hybrid Enabled Fill B-side upper with 6 psi H2, Hybrid DISABLED Fill C-Side with 30 psi D2, Hybrid Enabled J-Bottom as is, Hybrid DISABLED ECE and VUV valves enabled, if no vacuum problems Run will begin with shot 990915007 We will scan Ip down to lowest reasonable levels and then scan it upwards to get as wide range of Ip scaling of rotation as possible. |
| Session Leader Comments | |||
| Sep 16 1999 10:01:22:467AM | 990916001 | John Rice | reran 990915007 with 2MW RF flat top |
| Sep 16 1999 10:02:20:090AM | 990916002 | John Rice | same, with 2MW RF flat top from .6 to 1.1 s |
| Sep 16 1999 10:02:55:310AM | 990916002 | John Rice | same, with 2MW RF flat top from .6 to 1.1 s and earlier TF ramp |
| Sep 16 1999 10:14:06:653AM | 990916004 | John Rice | lower current to .6 MA and earlier TF ramp |
| Sep 16 1999 10:31:52:090AM | 990916005 | John Rice | .6 MA and later RF pulse |
| Sep 16 1999 10:51:45:357AM | 990916006 | John Rice | .6 MA |
| Sep 16 1999 11:07:37:467AM | 990916007 | John Rice | .4 MA w/disruption |
| Sep 16 1999 11:30:10:437AM | 990916008 | John Rice | .4 MA but RF tripped |
| Sep 16 1999 11:52:52:043AM | 990916009 | John Rice | .4 MA but RF tripped again |
| Sep 16 1999 12:21:08:123PM | 990916010 | John Rice | .4 MA, RF tripped again |
| Sep 16 1999 12:25:08:967PM | 990916011 | John Rice | .4 MA, only D antenna |
| Sep 16 1999 12:43:58:700PM | 990916012 | John Rice | .4 MA, good RF |
| Sep 16 1999 01:48:22:607PM | 990916013 | Earl Marmar | Only one transmitter available; switching to H/D scan to assess RF absorption 1 MA RF Tripped |
| Sep 16 1999 01:58:28:750PM | 990916014 | Earl Marmar | retry same RF trip; stays in H-Mode H/D = .035 |
| Sep 16 1999 02:14:12:937PM | 990916015 | Earl Marmar | retry RF stayed on big increase in radiated power early in RF pulse H/D = .035 |
| Sep 16 1999 02:31:35:700PM | 990916016 | Earl Marmar | puff H_2 from B-side upper 100 msec puff, 100 volt, .609 < t < .709 RF power somewhat variable, but turn-off seems ok H/D = .04 |
| Sep 16 1999 03:23:20:030PM | 990916017 | Earl Marmar | retry with 150 ms pulse on B side upper (.559 < t < .709) ~1 MW from E port H/D ~ 0.04 |
| Sep 16 1999 03:25:35:467PM | 990916018 | Earl Marmar | add another 100 ms to H_2 puff It does not appear that the valve is opening. H/D ~ 0.05 Increases in H from shot 16 on might be due to J-Port outgassing. |
| Physics Operator Comments | |||
| Sep 16 1999 09:22:51:840AM | 990916001 | Ron Parker | Shot 001 Shot ran as programmed (same settings as for 990915007) No changes for the next few shots |
| Sep 16 1999 09:45:31:217AM | 990916002 | Ron Parker | Shot 002 Reproduced shot 001 Shot ran well, good H-Mode, RF power ~ 2 MW (1&2) TF ramp will be moved 50 msec earlier for next shot |
| Sep 16 1999 10:12:51:420AM | 990916003 | Ron Parker | Shot 003 Shot ran well, as programmed. TF ramp moved 50 msec earlier Next shot will have current reduced to 600 kA. Also, TF ramp moved 100 msec earlier |
| Sep 16 1999 10:17:19:263AM | 990916004 | Ron Parker | Shot 004 Shot ran well, as programmed. RF turns on just as current flattops to lower value. Next shot, same as 004, but RF will pulse 100 ms later. |
| Sep 16 1999 10:37:29:390AM | 990916005 | Ron Parker | Shot 5 Ran as programmed. 600 kA H-mode, 2 MW RF. Next shot will be a repeat of 005. |
| Sep 16 1999 11:02:16:670AM | 990916006 | Ron Parker | Shot 006 Ran as programmed. John Goetz takes over as Phys Op. Current for next shot will be programmed to 400kA. ICEF4 = 2800A in segment 2 CLEARIN = -.014 in segment 2 (inner gap is getting big) RCUR = .672 in segment2 (outer gap is getting big) |
| Sep 16 1999 11:25:11:187AM | 990916008 | Ron Parker | Shot 007 Plasma - disrupts at 0.62s inner gap of ~2.4cm and outer gap of ~2cm n / n_crit ~ 1.5 Next shot: CLEARIN = -.02 and RCUR = .675 to make smaller gaps |
| Sep 16 1999 11:40:13:090AM | 990916008 | Ron Parker | Shot 008 Plasma 0.4MA, 0.9e19 on nl04 RF tripped some strange happenings with the Dalpha during this shot Next shot: RCUR = 0.676 and CLEARIN=-.021 ZXL = -.011 (was -.005) because the x-point is ~1cm high |
| Sep 16 1999 11:53:44:217AM | 990916009 | Ron Parker | Shot 009 Plasma RF #2 tripped same phenomenon on D_alpha as the last shot outer gap ~ 1cm; inner gap ~ 1.8cm got the x-point down to -38.5cm Next shot: no changes |
| Sep 16 1999 12:12:29:030PM | 990916010 | Ron Parker | Shot 010: Plasma OH2 fault @ 0.86s, disruption @ 1.07s Next shot: try again |
| Sep 16 1999 12:30:15:107PM | 990916011 | Ron Parker | Shot ran, but no power from MW 2. Some problem with bringing up diagnostic signals. Try again, next shot. Parker taking over again as PhysOp, relieving Goetz who did an outstanding job filling in. |
| Sep 16 1999 01:47:58:327PM | 990916012 | Ron Parker | Shot 12 was successful, with 2 MW coupled at 400 kA. Shot 13 will be a repeat of shot 12. Cell entry granted. Change in plans: Transmitter 2 has arcing problem due to humidity. Scan of current at 2 MW cannot be completed. Instead, we'll run 1 MW, 1 MA plasmas and study RF absorption vs. H/D ratio. Session Leader is now E. Marmar |
| Sep 16 1999 01:49:13:687PM | 990916013 | Ron Parker | Shot 13 Ran as programmed. RF tripped. Will repeat, with TF wiggle taken out. |
| Sep 16 1999 01:57:36:140PM | 990916014 | Ron Parker | Shot ran OK. RF tripped. Repeat shot, without changes. |
| Sep 16 1999 02:44:15:280PM | 990916015 | Ron Parker | Shot 15 Shot ran as programmed. |
| Sep 16 1999 02:47:28:327PM | 990916016 | Ron Parker | Shot 16 Shot ran OK. Modest increase in H/D ratio. Next shot, H2 gas will be increased to 150 ms in pulse length (100 V) |
| Sep 16 1999 02:53:53:420PM | 990916017 | Ron Parker | Shot 17 Ran as programmed. H/D ratio increased, only slightly. J port pulsed to about 0.5 MW, from .5 to .7 s. E port pulses at about .75 s at a level of about 1 MW, off at about 1.25 s. H2 pulsed gas will be increased -- increase pulse 100 ms |
| Sep 16 1999 03:06:11:043PM | 990916018 | Ron Parker | Shot 18 Ran as programmed. Run terminated with this shot because of concerns over storm (Floyd). |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:13:16:530AM | Plasma | Ok | 09:10 Interfer delay /no faults/plasma |
| 2 | 09:32:55:920AM | Plasma | Ok | no faults/plasma |
| 3 | 09:51:11:890AM | Plasma | Ok | no faults/plasma |
| 4 | 10:11:14:950AM | Plasma | Ok | no faults |
| 5 | 10:29:08:577AM | Plasma | Ok | no faults/plasma |
| 6 | 10:48:20:623AM | Plasma | Ok | no faults/plasma |
| 7 | 11:06:08:217AM | Plasma | Ok | no faults/disr. |
| 8 | 11:25:08:687AM | Plasma | Ok | no faults/disrupt |
| 9 | 11:42:11:950AM | Plasma | Ok | (null) |
| 10 | 12:00:23:000PM | Plasma | Ok | (null) |
| 11 | 12:19:11:793PM | Plasma | Ok | (null) |
| 12 | 12:38:20:310PM | Plasma | Ok | (null) |
| 13 | 01:32:27:437PM | Plasma | Ok | no faults/plasma |
| 14 | 01:47:53:840PM | Plasma | Ok | no faults/plasma |
| 15 | 02:03:46:500PM | Plasma | Ok | no faults/plasma |
| 16 | 02:21:37:950PM | Plasma | Ok | no faults/plasma |
| 17 | 02:40:44:107PM | Plasma | Ok | no faults/plasma |
| 18 | 03:00:10:500PM | Plasma | Ok | no faults |