| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Alex Ince-Cushman |
| Physics operator(s): | Jim Irby |
| Engineering operator(s): | Andy Pfeiffer,Ed Fitzgerald,Bill Parkin |
| Engineering Operator Run Comment |
| MP#437 Poloidal Rotation SL Ince-Cushman PO Irby |
| Session Leader Plans |
| Entered: May 19 2006 05:19:29:923PM |
| Author: Alex Ince-Cushman |
| Session Leader Plan - 10605019
Field Reversal and Edge Poloidal Rotation - MP 437 Session Leader: A Ince-Cushman Physics Operator: S Wolfe This mini-proposal was put forward to compare rotation measurements in standard and reversed field. This run day will be used to complete the reversed field component of the mini-proposal. The run will be divided into two parts: 1 - Repeat some EDA-H-modes in both USN and LSN from 1051202. 2 ⿿ Inner wall limited elongation scan SETUP: Key diagnostics: Hirex, NeSoXs, Thomson, Edge Thomson, GPC, Bolometer arrays, McPherson, Chromex, CXRS, scanning probe Gas puffs: Argon/Neon puff: 50ms at 0.3s (Neon at 2psi, Argon at 1psi) Part 1) EDA H-modes ----------------------------- LSN ------- Start with shot: 1051202015 Bt=5.6 T Ip=0.8 MA NL_04 (target)=1.0e20 m-2 RF waveform: Flat top ON at 0.7 OFF at 1.3 at 2 MW USN -------- Start with shot: 1051202022 Key parameters are: Bt=5.6 T Ip=0.8 MA NL_04 (target)=1.0e20 m-2 RF waveform: Flat top ON at 0.7 OFF at 1.3 at 3 MW Part2) Inner wall limited ------------------------------- The following shots will be loaded for the kappa scan 1.6 -> 1051206028 1.35 -> 1051206032 |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: May 19 2006 06:16:09:390PM |
| Author: Alex Ince-Cushman |
| MP 437 - Field Reversal and Poloidal Rotation
Session Leader: A Ince-Cushman Physics Operator: J. Irby We began the run attempting to get LSN EDA H-mode plasmas. These LSN discharges were plagued by strong MARFEs and inconsistent RF trips which limited the discharges to dithering H-modes. In an attempt to improve performance a 10 minute boronization was applied between shots 12 and 13 using the now standard recipe (sweep 65 to 75 with dwell at 70 cm. 5 mTorr 20% diborane). The two shots preceding the boronization were fizzles, but on shot 16 we finally produced an EDA H-mode. The next plasma (shot 18) was back to dithering H-modes. We tried switching to LSN in the hope that the borinzation had not been worn off in the divertor, but there did not seem to be enough RF power to get into H-mode. We then switched back to USN for the remainder of the run. We were hoping to see a reversal of the 'kick' in poloidal rotation that has been observed repeatedly on H-L transitions of EDA H-modes with the standard field direction. We were only able to produce one EDA H-mode discharge (shot 16) and the kick was not observed. It is not clear if this means that the plasma conditions required for this kick were not properly reproduced or if the kick is an artifact of the NeSoXs instrumentation. Hopefully we will obtain additional data next week that will help to resolve this question. All shots were at Ip = -0.8MA and Bt = -5.4 Shot Topology RF(MW) Notes --------------------------------------------------------------- 1 LSN - Good shot 2 LSN 2 Good shot - disrupted at 1.5s 3 - - Fizzle 4 - - Fizzle 5 - - Fizzle 6 LSN ~1.5 Disrupted at 1.0s 7 LSN ~3 Brief H-mode, a few RF trips 8 LSN ~3 Two brief h-modes, a few major trips 9 USN ~2 Dithering H-modes for length of RF pulse 10 USN 3 Dithering H-modes 11 USN 3 Dithering H-modes, multiple RF faults 12 USN 3 Dithering H-modes, RF a little better Between shot boronization for 10 minutes 13 - - Fizzle 14 - - Fizzle 15 USN ~1 RF had some trouble 16 USN 1-3 Finally an EDA - RF antennas failed 1 by 1 17 Fizzle 18 USN 2 Back to dithering H-modes 19 LSN ~2 No H-mode - RF power was too low 20 LSN ~2 Very brief H-mode, multiple RF trips 21 Fizzle 22 USN 3 Dithering H-mode, a single RF fault 0.91s 23 Fizzle |
| Physics Operator Summaries |
| Entered: May 19 2006 05:52:56:983PM |
| Author: Jim Irby |
| Steve Wolfe worked very hard to get the fix for the failed #11 flux loop installed for the run day. The first two shots seems to run okay, but with a very negative br0 being indicated. We then had three fizzles. By shot 05 Steve had determined that the br0 readings were not correct. Some reprogramming resulted in a plasma on shot 06, and a 1 mT positive jump in br0. All plasmas to this point had a very large MARFE causing trouble for the rf. We were only able to get briefly into h-mode on shot 08. On shot 09 we went to upper null with a Bart mode developing and problems with j-port (only 2 MW total). I also had too large an outer gap, which was corrected in shot 10. On shot 11 we tried raising the density a little to get an eda, but no success.
Before shot 13 we did a 10 minute boronization: sweep 65 to 75 with dwell at 70 cm. 5 mTorr 20% diborane Boronization recovery still costs two shots today. Reduced fill to 4 ms for first shot, then back to 16 for the second. It went on the third try w/o any changes. Nice eda for Alex. Boron depleated in one shot. On shot 19 we returned to lsn hoping some boron was left, but just got the MARFE back. We tried dropping the density a little for 20 and upped the rf power to 3 MW, but still no h-mode or eda until very late. The rest of the run was done with a usn so that Alex could get some data with h-modes if not eda h-modes. For the last shot of the day we increased the ar/ne puff to 80 ms so that NESOX could have a very good signal. We need to figure out what to do about the MARFE. It begins around 0.45 s and then goes away with the start of rf. The start of the MARFE could be related to the drop in the inner wall gap around that time. I tried moving it away from the wall early in the day, but probably should have been more agressive. The MARFE was most serious in lsn but was still there in the usn cases. On shot 24 it seemed to leave behind some shrapnel on the inner wall as it moved away (see wide2 movie). plasma 01,02,06,07,08,09.10,11,12,15, 16,18,19,20,21,22,24 fizzle 03,04,05,13,14,17,23 |
| Session Leader Comments | |||
| May 19 2006 12:20:05:703PM | 1060519001 | Alex Ince-Cushman | Good plasma.
The shot was based on shot 19 from yesterday (1060518) except that it was LSN instead of USN. LSN, Ip = -0.8, Bt = -5.4, nl04 = 7e19, RF = 0MW Ar/Ne Puff: 50ms @ 0.3s, 2psi Ne & 1psi Ar For the next shot we will increase the target density and try to get some RF into the plasma. |
| May 19 2006 12:20:22:127PM | 1060519002 | Alex Ince-Cushman | Another good plasma although it disrupted at ~1.5s.
LSN, Ip = -0.8, Bt = -5.4, nl04 = 1.0e20, RF = 2MW Ar/Ne Puff: 50ms @ 0.3s, 2psi Ne & 1psi Ar Despite 2W of power there was no H-mode. For the next shot we will up the RF to 3MW, and fiddle with the inner gap. |
| May 19 2006 12:20:42:673PM | 1060519006 | Alex Ince-Cushman | Disruption at ~1.0s.
LSN, Ip = -0.8, Bt = -5.4, nl04 = 1.0, RF = 1.5-3MW Ar/Ne Puff: 50ms @ 0.3s, 2psi Ne & 1psi Ar Large MARFE causing some problems, although the RF kills it. |
| May 19 2006 12:21:26:843PM | 1060519007 | Alex Ince-Cushman | Good Shot. Brief H-mode
LSN, Ip = -0.8, Bt = -5.4, nl04 = 1.0, RF = 0-3MW Ar/Ne Puff: 50ms @ 0.3s, 2psi Ne & 1psi Ar The MARFE is still coming in around .4s and is turned off by the RF. The RF was up to 3MW but there were some major faults around 1s. |
| May 19 2006 04:26:19:907PM | 1060519008 | Alex Ince-Cushman | Good Shot. Two brief H-mode
LSN, Ip = -0.8, Bt = -5.4, nl04 = 1.0, RF = ~3MW Ar/Ne Puff: 50ms @ 0.3s, 2psi Ne & 1psi Ar The MARFE persists ]. 3MW of RF with sporadic faults. It does not look like we will be able to get EDA H-modes in LSN. Switch to USN for the next shot. |
| May 19 2006 12:58:13:877PM | 1060519009 | Alex Ince-Cushman | Good Shot. Sustained period of H-modes, but no EDA
USN, Ip = -0.8, Bt = -5.4, nl04 = 1.0, RF = 2MW Ar/Ne Puff: 50ms @ 0.3s, 2psi Ne & 1psi Ar |
| May 19 2006 04:25:35:860PM | 1060519010 | Alex Ince-Cushman | Good Shot. Sustained period of H-modes, but no EDA
USN, Ip = -0.8, Bt = -5.4, nl04 = 1.0, RF = 2-3MW Ar/Ne Puff: 50ms @ 0.3s, 2psi Ne & 1psi Ar |
| May 19 2006 01:40:51:673PM | 1060519011 | Alex Ince-Cushman | Good Shot. Sustained period of H-modes, but no EDA
USN, Ip = -0.8, Bt = -5.4, nl04 = 1.0, RF = 2-3MW Ar/Ne Puff: 50ms @ 0.3s, 2psi Ne & 1psi Ar |
| May 19 2006 01:42:58:657PM | 1060519012 | Alex Ince-Cushman | Good Shot. Sustained period of H-modes, but no EDA
USN, Ip = -0.8, Bt = -5.4, nl04 = 1.0, RF = 2MW Ar/Ne Puff: 50ms @ 0.3s, 2psi Ne & 1psi Ar For the next shot we are going to try a 10min between shot boronization. |
| May 19 2006 03:49:19:330PM | 1060519015 | Alex Ince-Cushman | 1st successful shot after Boronization
USN, Ip = -0.8, Bt = -5.4, nl04 = 1.0, RF = 1MW Ar/Ne Puff: 50ms @ 0.3s, 2psi Ne & 1psi Ar Shot looks good but we need more than 1MW of RF to get an EDA H-mode |
| May 19 2006 03:58:04:797PM | 1060519016 | Alex Ince-Cushman | Finally an EDA H-mode
USN, Ip = -0.8, Bt = -5.4, nl04 = 1.0, RF = 2-3MW Ar/Ne Puff: 50ms @ 0.3s, 2psi Ne & 1psi Ar The RF atennas faulted one by one from about t > 1.38 |
| May 19 2006 04:23:56:953PM | 1060519018 | Alex Ince-Cushman | Back to dithering H-modes
USN, Ip = -0.8, Bt = -5.4, nl04 = 1.0, RF = ~2MW Ar/Ne Puff: 50ms @ 0.3s, 2psi Ne & 1psi Ar The RF was quite clean |
| May 19 2006 04:11:57:813PM | 1060519019 | Alex Ince-Cushman | Switch to LSN in the hope that the boronization has not worn off down there.
LSN, Ip = -0.8, Bt = -5.4, nl04 = 1.0, RF = 2-3MW Ar/Ne Puff: 50ms @ 0.3s, 2psi Ne & 1psi Ar The RF performed very well, but there wasn't enough power to get into H-mode. |
| May 19 2006 04:19:53:110PM | 1060519020 | Alex Ince-Cushman | One very brief H-mode killed by RF trip.
LSN, Ip = -0.8, Bt = -5.4, nl04 = 1.0, RF = ~2-3MW Ar/Ne Puff: 50ms @ 0.3s, 2psi Ne & 1psi Ar |
| May 19 2006 04:59:18:703PM | 1060519022 | Alex Ince-Cushman | No chance of getting H-modes in LSN any more so switch back to USN. The RF performed well at 3MW with only one major fault.
USN, Ip = -0.8, Bt = -5.4, nl04 = 1.0, RF = 3MW Ar/Ne Puff: 50ms @ 0.3s, 2psi Ne & 1psi Ar |
| Physics Operator Comments | |||
| May 18 2006 10:20:10:470AM | Jim Irby | Engineering setup for Thursday 19 May 2006
MP#437 Field Reversal and Edge Poloidal Rotation Session leaders: B. Labombard Physics operator: R. Granetz Overnight ECDC in deuterium; bake at 60 C BE PREPARED FOR BETWEEN SHOT BORONIZATION The run will start at 09:00 and end at 17:00. Power systems as on: A-coil configuration: normal [-Dtop +Dbot +Jtop -Jbot] and enabled. Gas Setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar + 2 psi Ne Hybrid enabled (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill NINJA with 10 psi D2 enabled Enable the following gate valves and shutters: ECE, VUV, Z-bolo shutters Key diagnostics: NESOX and HIREX ------------------------------------------------------------------------------- ICRF Setup: all transmitters ready to go by 9:00 ------------------------------------------------------------------------------- Run plan: | |
| May 19 2006 09:23:47:230AM | 1060519001 | Jim Irby | seg 1 RCUR offset was -1200
called FLUXIHH and then setset offset where available, I recalculated the following in all segments (probably twice): RCUR ZCUR ZCUR BR0 BZ0 CLEARIN RXL ZXL RXU ZXU SSEP STRKSI STRKIN seg 4 P_INFO could not return info about SSEP or ssep did a load/clean P_10 and P_12 in seg 2 needed to be "touched" plasma on first shot |
| May 19 2006 09:45:30:513AM | 1060519002 | Jim Irby | nl_04 request to 1e20 from 7e19 /m^2
plasma for 1.514 s --- 800 kA disruption --- 2.1 MW of rf with one trip early 3 and 4 outer gap is very large -- 1.8 cm --- will reduce for next shot |
| May 19 2006 09:58:52:357AM | 1060519003 | Jim Irby | RCUR in seg 2 from 0.6565 to 0.6610 m --- 5 mm change
nl_04 request from 1.0e20 to .9e20 /m^2 no changes to startup --- ignoring last disruption ratiomatic has been 0.044e-3 Torr first two shots rf will attempt 3 MW on this shot fizzle --- should have dropped gas I guess fields okay --- large h-alpha increase around 10 ms --- pressure a little higher than shot 1 or 2 prepuff currently at 18 ms |
| May 19 2006 10:18:19:920AM | 1060519004 | Jim Irby | no dpcs changes
fizzle --- br0? |
| May 19 2006 10:27:23:467AM | 1060519005 | Jim Irby | br0 from 0.0 to +0.00025 --- Steve is not certain that we can believe br0, but it does indicate being at least a mT low.
fizzle again! br0 seemed to respond to my change --- will make a bigger adjustment for the next shot h-alpha actually went down this time before it bounced... |
| May 19 2006 11:28:32:220AM | 1060519006 | Jim Irby | br0 to +0.001 from +0.00025 T
Steve may have found problem with software --- holding Steve gave okay to try again. He is not sure why the first two shots worked today. did a recalc on br0 in seg 1. Offset is now back to 0.0 plasma for 0.736 s --- br0 from -1.2 to -0.2 mT large MARFE starting around 0.43 s and going until rf starts prad_main to 3 MW at 0.8 s |
| May 19 2006 11:56:34:593AM | 1060519007 | Jim Irby | clearin from -.0015 to -.0005 m
plasma into rampdown, but still have the MARFE several retrys on rf but eventually got 3 MW clearin change kept us a little more off the wall neuts/hards down this shot, can probably drop gas some next shot. |
| May 19 2006 12:21:30:843PM | 1060519008 | Jim Irby | dropped seg 1 programmed gas
prepuff from 18 to 17 ms --- ratiomatic up last shot plasma into rampdown --- still have MARFE, but brief h-modes 120 kJ j-port tripping, but 2 to 3 MW total neuts/hards okay |
| May 19 2006 12:36:35:500PM | 1060519009 | Jim Irby | Moved to upper null: Seg 2 off, seg 3 on.
I did a recalc of all the magnetics predictors again, just to make sure I hadn't missed any earlier. plasma into rampdown --- runaways back --- short MARFE period --- h-mode/Bart mode prad_main and net rf power pretty much the same outer gap too large again. j not happy |
| May 19 2006 12:51:24:877PM | 1060519010 | Jim Irby | RCUR increased by 0.005 m
plasma into rampdown --- Bart mode -- 2 to 3 MW of rf neuts/hards down factor of 5 or 10 for no clear reason got the outer gap down j port ran but with a few trips prad_main 2.1 MW |
| May 19 2006 01:21:10:937PM | 1060519011 | Jim Irby | prepuff from 17 to 16 ms --- ratiomatic up
nl_04 request from 0.95 to 1.05e19 / m^2 plasma --- still having troubles with j neuts/hards okay |
| May 19 2006 02:52:42:233PM | 1060519013 | Jim Irby | between shot boronization before this shot
purge done at 36 minutes --- should do purge before run? bottle open at 42 minutes gas in machine by 56 minutes dropped prepuff to 4 ms fizzle --- low ciii --- gas at .02 mTorr |
| May 19 2006 03:07:37:623PM | 1060519014 | Jim Irby | prepuff back to 16 ms
fizzle drop in br0 by about .3 mT relative to shot 8 |
| May 19 2006 03:19:27:343PM | 1060519015 | Jim Irby | no changes
itg 1.3e-6 Torr at check plasma --- rf in trouble boronization was very effective if we can get more rf |
| May 19 2006 03:33:45:440PM | 1060519016 | Jim Irby | no dpcs changes
plasma --- h-mode --- 3 MW of rf |
| May 19 2006 03:39:03:627PM | 1060519017 | Jim Irby | no dpcs changes
rf adjustments fizzle |
| May 19 2006 03:57:48:703PM | 1060519018 | Jim Irby | prepuff from 16 to 15 ms
plasma for 1.32 s --- Bart returns --- injection kills plasma |
| May 19 2006 04:13:04:500PM | 1060519019 | Jim Irby | going back to LSN ---- is there still boron there
seg3 off, seg 2 on Alex will try to bring back some j-port power plasma but have the MARFE back |
| May 19 2006 04:22:49:423PM | 1060519020 | Jim Irby | dropped nl_o4 request to 8 from 9e19/m^2
dropped early programmed gas a little --- no runaway problem last shot plasma --- still had the MARFE 3 MW of rf until the h-mode and then some trips back to usn next shot |
| May 19 2006 04:44:59:860PM | 1060519021 | Jim Irby | seg 3 off, seg 2 on --- usn
fizzle --- spike in h-alpha at 15 ms |
| May 19 2006 04:54:28:890PM | 1060519022 | Jim Irby | no dpcs changes
plasma into rampdown --- h-mode --- 3 MW of rf |
| May 19 2006 05:03:25:423PM | 1060519023 | Jim Irby | argon/neon puff from 50 to 80 ms with start at 300 ms
fizzle --- not at all clear why |
| May 19 2006 05:19:59:750PM | 1060519024 | Jim Irby | prepuff from 15 to 16 ms
ef4 from +1330 to +1325 A (tweak for tweak's sake) plasma into rampdown --- bz0 did go lower rf at 3 MW with trip during first h-mode (elm-free) EOT |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:11:59:263AM | Plasma | Ok | |
| 2 | 09:28:00:060AM | Plasma | Ok | |
| 3 | 09:52:32:717AM | Plasma | Ok | |
| 4 | 10:05:25:213AM | Plasma | Ok | |
| 5 | 10:21:14:450AM | Plasma | Ok | |
| 6 | 11:18:15:203AM | Plasma | Ok | |
| 7 | 11:43:21:390AM | Plasma | Ok | |
| 8 | 12:01:33:690PM | Plasma | Ok | |
| 9 | 12:26:11:377PM | Plasma | Ok | |
| 10 | 12:40:40:440PM | Plasma | Ok | |
| 11 | 12:56:56:920PM | Plasma | Ok | |
| 12 | 01:17:49:420PM | Plasma | Ok | |
| 13 | 02:36:41:017PM | Plasma | Ok | |
| 14 | 02:53:53:233PM | Plasma | Ok | |
| 15 | 03:06:35:437PM | Plasma | Ok | |
| 16 | 03:19:23:470PM | Plasma | Ok | |
| 17 | 03:34:22:547PM | Plasma | Ok | |
| 18 | 03:48:25:500PM | Plasma | Ok | |
| 19 | 04:01:00:923PM | Plasma | Ok | |
| 20 | 04:15:36:920PM | Plasma | Ok | |
| 21 | 04:31:26:657PM | Plasma | Ok | |
| 22 | 04:44:43:190PM | Plasma | Ok | |
| 23 | 04:57:33:203PM | Plasma | Ok | |
| 24 | 05:10:48:767PM | Plasma | Ok | |