| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | D Jablonski |
| Physics operator(s): | Earl Marmar |
| Engineering operator(s): | Joe Daigle,Vinny Bertolino |
| Engineering Operator Run Comment |
| marmer |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:15:133PM |
| Author: To Be Determined |
| Session Leader Report for 8 February 1996 Run 960208 For Miniproposal 139 Earl Marmar, Physics Operator David Jablonski, Session Leader The run went reasonably well, though perhaps not all that was hoped to be accomplished was accomplished. The new Nitrogen filters appear to not work terribly well. In shot 3, we performed a Nitrogen injection at the inner-wall midplane, observing through a N-I filter (868nm) with the B-side Culham camera. Nothing but a blank screen was observed. This even though the Chromex saw the 868 line to be rather bright. The reason for this failure is not known at the moment (the CCD camera should be sensitive to this wavelength). The attempts to observe flow reversal by reducing the outer gap while puffing through the outer limiter capillary were also not succesfull. The Helium II and Nitrogen II plumes were still observed to go towards the strike-point (shots 5-8). It was hoped that flow reversal might be seen with the plumes, as is seen with the scanning probe often in low density shots. A number of decent Helium II plumes were observed in the bottom half of the machine with the top Culham camera (shots 9-13). These observations were made possible by the installation of a new He-II filter in the B-top filter wheel. The efforts to perform upper x-point discharges met with decidedly negative results. Shot 19 was perhaps the bast upper x-point, there was no NINJA puff for it. Shots 20, 24, 32, and 33, the first two with Helium puffing at the inner-wall, the second two with Nitrogen puffing at the inner-wall, were moderately succesful, with disruptions ending the shots prematurely. Shot 35, with a Nitrogen puff at the inner-wall midplane, gave a rather good upper x-point, with the plasma going the distance. The plumes on these shots were not quite what was expected. They tended to be somewhat symmetric, and in some frames seem to show actual flow reversal. The reason for the odd behaviour (compared with the lower x-point shots, and the Carbon plume upper x-point shots performed last year) is not known, and will require analysis. The pictures taken with the A-side camera (with a C-III filter) will also be useful in analyzing these shots. Shot 31 provides what might be characterized as the best 'Viewgraph Shot' of the day. Nitrogen was puffed on the top of the inner and outer divertor noses simultaneously, while viewed by the top Culham camera through a N-II filter. The plumes produced go in opposite directions (CW and CCW, as appropriate), towards the appropriate strike point. Many of the shots also provided for the taking of interesting data with the McPherson, Chromex, and Scanning Probe systems. A shot by shot breakdown is given below. 'Plenum' gives the gas and pressure in torr in the NINJA plenum. 'Capil' the capillary puffed through. 'Trig' the NINJA valve trigger time and pulse length. 'Filts' the filters used on the Culham cameras. 'Cam' which Culham camera is hooked up to the optical recording system. Shot X-P Plenum Capil Trig Filts Cam nl04 Comments ==== === ====== ===== ==== ===== === ==== ======== 01 Dwn N2/307 -- -- H-A sid -- Fiducial, Fizzle 02 Dwn N2/307 -- -- H-A sid 1.2e20 Fiducial, H-A lks horrible 03 Dwn N2/307 B16-001 .4/.1 N-I sid 9.5e19 See Nothing in N-I See plume on Jim's A-Side 04 -- -- -- -- -- -- -- Hybrid Test 05 Dwn N2/306 B33-001 .4/.1 N-II top 1.1e20 sg,CCW so-so Plume 06 Dwn N2/306 B33-001 .4/.1 N-II top 9.5e19 sg,CCW so-so Plume 07 Dwn N2/306 B33-001 .4/.1 N-II top 8.0e19 sg,CCW so-so Plume 08 Dwn He/601 B33-001 .4/.1 He-II top 1.0e20 sg,CCW so-so Plume 09 Dwn He/601 B33-001 .4/.1 He-II top 1.1e20 ng,Very diffuse 10 Dwn He/600 B22-022 .4/.1 He-II top 1.1e20 A couple frames of decent plume A31-014 .8/.1 11 Dwn He/600 B31-086 .4/.1 He-II top 1.0e20 A couple frames of okay plume A31-014 .4/.1 12 Dwn He/596 B31-086 .4/.1 He-II top 1.2e20 A couple okay frames, dis .65 13 Dwn He/596 B31-086 .4/.1 He-II top 1.6e20 See almost nothing 14 Dwn He/596 B16-001 .4/.1 N-I sid 1.3e20 Wrong Filt, redo next B20-001 15 Dwn He/596 B16-001 .4/.1 He-I sid 1.1e20 Nice Pinpoints of He-I B20-001 16 Up He/595 -- -- H-A sid -- Lasts About 200 msec 17 Up He/595 -- -- He-I sid -- Lasts About 200 msec 18 Up He/595 -- -- He-II sid -- Lasts About 300 msec 19 Up He/592 -- -- H-A sid 1.0e20 H-A picture grainy 20 Up He/592 B16-001 .4/.1 He-II sid 1.0e20 (Sym) Plume, Dis .65 21 Up He/591 B16-001 .4/.1 He-II sid -- Power System Failure 22 Up He/591 B16-001 .4/.1 He-II sid -- Dis .4, no He in 23 Up He/591 B16-001 .4/.1 He-II sid -- Fizzle 24 Up He/590 B16-001 .4/.1 He-II sid 1.1e20 Nice Plume,Sym&Wrong Dir 25 Dwn He/590 B16-001 .4/.1 He-II sid -- Big Fizzle A31-014 .8/.1 He-II 26 Dwn He/588 B16-001 .4/.1 He-II sid 1.0e20 Okay Plume,Straight Accross, A31-014 .8/.1 He-II See tail going around on A-Side 27 Dwn N2/325 B26-019 .4/.1 N-II top -- Big Fiz 28 Dwn N2/325 B26-019 .4/.1 N-II top -- Big Fiz 29 Dwn N2/325 B26-019 .4/.1 N-II top 8.0e19 Nice Shot,See some Divertor Lt 30 Dwn N2/322 B31-038 .4/.1 N-II top -- Big Fiz 31 Dwn N2/320 B22-022 .4/.1 N-II top 8.0e19 Nice Double Plume! B31-086 'Viewgraph' Shot 32 Up N2/320 B16-001 .4/.1 N-II sid 8.5e19 Strge Plume,Sym,Dis at .72 See nice on A-side too (W) 33 Up N2/318 B16-001 .4/.1 N-II sid 8.5e20 Same as 32, See multi-strm on A Amazing A-movie, inc reversal 34 Up N2/316 B16-001 .3/.1 N-II sid -- Big Fiz 35 Up N2/315 B16-001 .3/.1 N-II sid 8.7e19 Same as 33,full shot,Amaz on A 36 Dwn -- -- -- H-A sid -- Fiducial,Early Dis |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:56:067PM |
| Author: To Be Determined |
From: PHYSOP::MARMAR Date: 8-FEB-1996 18:52:20 Subj: Physics operator's run summary 960208 Physics Operator Summary for Thursday, 960208 MP 139 Plumes EO Bertolino/Daigle PO Marmar SL Jablonski Engineering setup: Discharge clean in deuterium for 1 hour before the run A-side (actually K-side) plenum: 19-20 psi of deuterium B-top plenum: 5 psi of deuterium. B-side-lower plenum: 4 psi of argon. NINJA plenum: 300 torr nitrogen Enable hybrid control of A-side and B-top valves for start of run. Enable the ECE, VUV, Moly monitor, PCX, and TCX valves, assuming status of each is okay. Use engineering settings from shot 960202001 (a fiducial shot); enable hybrid control of toroidal field current. Generally an ok run, but: we had difficulty making upper x-point shots that were vertically stable; fizzles became a problem after shot 22 [disruptions?, nitrogen? (puffed intentionally through NINJA), karma?]; glitches on hybrid outputs returned, affecting the TF time history on shots 2 and 3 (Wolfe monitored this through the run, and made numerous entries into the hybrid topic in the logbook) See the session leader's summary for discussion of the plume measurements. There was a problem with EF4 on shot 20, after the disruption (high current through varistors for a short time); on shot 21, EF4 supply blew a fuse due to a bad SCR (presumably caused by shot 20). Shot summary: 1. Fiducial; fizzle 2. B_r offset to 6.2mT, add 1 ms to PG4 prepuff; plasma; disrupt on injection near end of flat-top (1.03 s); loaded into fiducial databases (ohmic and RF) 3. nl_04 to .75e20, clearin to +.003; plasma; glitches on hybrid; got nl_04 ~ .95e20; TF on hybrid control to test gentle rampdown 4. hybrid test; seems ok 5. fiddle with gaps; TF on PLC control; plasma 6. increase right gap 1 cm; plasma 7. decrease right gap 5 mm; argon enabled; some early impurity injections; plasma 8. repeat; He puff on NINJA; plasma 9. gaps from shot 3; plasma; ohmic H-Mode early, followed by imp. injection at .54 s 10. early tweak on EF2byEF4 prop gain, to help Wolfe with diagnosis of hybrid glitches; plasma 11. repeat; plasma; H-mode .54 to .63 s 12. nl_04 programmed to 2e20; plasma; disrupt at .61 s 13. reduce gaps by 2 mm, move down 1 cm; plasma; disrupt on rampdown (.6MA) 14.nl_04 programmed to .9e20; plasma 15. nl_04 prog to .6e20; plasma; H-mode returned 16. attempt upper x-point; argon and NINJA disabled; plasma; disrupt at .24s (first down, then lost it up) 17. raise current limit on EF3's; program ZCUR to go up faster; plasma; lost it down at .22 s 18. reload segment 3 from 951213025, add a little early gas; lower nl_04 to .88e20; plasma; starts oscillating vertically at .205, finally lose it down 19. delay strkpsi control to .4 s; plasma; made it to below .2MA on rampdown 20. lower nl_04; NINJA on; plasma; disrupt; heads up at .605, lose it down; EF4 problem after the disruption (current through varistors) 21. lower zcur by 1 cm; raise ZXU programming to match x-pt better; dud; ef4 fault at -1 second 22. retry; plasma; disrupt; start oscillating after .4, finally lose it up 23. fiddle with RXL (move out); move ZCUR up 5 mm; fizzle 24. reduce pre-puff to 10 msec; plasma; disrupt .73 s (up) 25. back to lower x-point; fizzle 26. reduce pre-puff to 9 ms; plasma 27. retry; fizzle 28. Br offset to 6.8 mT; fizzle 29. Br offset to 6.0 mT; plasma; slight hesitation on Ip rise 30. raise pre-puff to 10 ms; fizzle 31. retry; plasma 32. upper x-point; plasma; disrupt at .72 (up) 33. ramp Ip a little faster between .5 and .8 MA; lower late strkpsi prog gain slightly; plasma; disrupt @.75 s (down) 34. reduce clearin by 4 mm; fizzle 35. retry; plasma; this was the only upper x-point shot of the day with NINJA that made it through ramp-down 36. fiducial; fizzle 35 plasma attempts, 26 plasmas, 8 fizzles, 1 power supply dud 1 hybrid test |
| Session Leader Comments |
| Physics Operator Comments |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:33:27:210AM | Plasma | Ok | |
| 2 | 08:44:03:470AM | Plasma | Ok | |
| 3 | 08:59:45:380AM | Plasma | Ok | |
| 4 | 09:15:06:840AM | Test | Ok | |
| 5 | 09:28:02:840AM | Plasma | Ok | |
| 6 | 09:39:18:400AM | Plasma | Ok | |
| 7 | 09:49:53:550AM | Plasma | Ok | |
| 8 | 10:06:34:660AM | Plasma | Ok | |
| 9 | 10:17:36:770AM | Plasma | Ok | |
| 10 | 10:51:16:050AM | Plasma | Ok | |
| 11 | 11:02:24:160AM | Plasma | Ok | |
| 12 | 11:13:26:400AM | Plasma | Ok | |
| 13 | 11:27:15:850AM | Plasma | Ok | |
| 14 | 11:38:29:680AM | Plasma | Ok | |
| 15 | 11:49:13:180AM | Plasma | Ok | |
| 16 | 12:07:53:330PM | Plasma | Ok | |
| 17 | 12:26:55:400PM | Plasma | Ok | |
| 18 | 12:41:57:000PM | Plasma | Ok | |
| 19 | 01:01:59:340PM | Plasma | Ok | |
| 20 | 01:13:59:810PM | Plasma | Ok | |
| 21 | 01:46:30:430PM | Plasma | Bad | ef4 ioc |
| 22 | 02:12:51:130PM | Plasma | Ok | |
| 23 | 02:29:56:730PM | Plasma | Ok | |
| 24 | 02:37:41:060PM | Plasma | Ok | |
| 25 | 02:54:07:840PM | Plasma | Ok | |
| 26 | 03:03:08:120PM | Plasma | Ok | |
| 27 | 03:16:35:470PM | Plasma | Ok | |
| 28 | 03:24:52:240PM | Plasma | Ok | |
| 29 | 03:34:53:860PM | Plasma | Ok | |
| 30 | 03:46:11:090PM | Plasma | Ok | |
| 31 | 03:56:41:420PM | Plasma | Ok | |
| 32 | 04:11:29:720PM | Plasma | Ok | |
| 33 | 04:24:44:830PM | Plasma | Ok | |
| 34 | 04:41:05:910PM | Plasma | Ok | |
| 35 | 04:49:39:540PM | Plasma | Ok | |
| 36 | 05:01:31:090PM | Plasma | Ok | |