| Miniproposals |
| Operators | |
| Session leader(s): | |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Bill Parkin |
| Engineering Operator Run Comment |
| MP527 - H-mode SSEP scans |
| Session Leader Plans |
| Entered: Oct 14 2009 03:52:20:347PM |
| Author: Jerry Hughes |
|
Bake/ECDC in D2 overnight 5.4T run in D2. 1psi Ar enabled, puff at 0.3s, 50ms in length ICRF: up to 3MW from D+E; keep J in reserve in case needed Essential diagnostics: Thomson, TCI, ECE, standard bolometry and Lyman alpha, reflectometry, fast magnetics. Highly desired diagnostics: passive edge CXRS, Hirex rotation, divertor probes Cryopump NOT requested. A. Discharge development is needed to recover SSEP scan, while avoiding the trouble row of tiles, and also to promote up-down symmetry of the equilibrium. 1. Attempt to reproduce the equilibrium of shot 1080125013 (5.4T, 800kA, target nl04=7e19, SSEP jogging twice during flattop). ICRF will tune D+E at low power (~1--2MW) during 1.3--1.5s. 2. Increase RXL as needed to raise strike point to the 4th tile. 3MW from D+E from 0.6s to 1.5s. This is an attempt to reproduce density and temperature pedestal modification observed in 2007-08. 2a.If necessary, adjust ZCUR program to achieve SSEP steps of -4mm, ~0mm, and +4mm. 3. Increase RXU so that triangularity is matched in the LSN/USN cases. 3MW from D+E from 0.6s to 1.5s. B. Keep discharge developed for A3. Keep ICRF program. Modify ZCUR to obtain steady H-mode periods of >200ms (3 per shot), changing SSEP on each shot to obtain a set of measurements at -6mm, -4mm, -2mm, +2mm, +4mm, +6mm. C. Raise Ip to 1MA, nl04 demand to 1e20. Keep ICRF program. Modify ZCUR to obtain steady H-mode periods of >200ms (3 per shot), changing SSEP on each shot to obtain a set of measurements at -6mm, -4mm, -2mm, +2mm, +4mm, +6mm. Try tweaking nl04 if steady H-modes are not accessible. D. If steady H-modes were achieved in C, go to 1.2MA and increase nl04 demand to 1.2e20. Modify ZCUR to obtain steady H-mode periods of >200ms (3 per shot), changing SSEP on each shot to obtain a set of measurements at -6mm, -4mm, -2mm, +2mm, +4mm, +6mm. Try tweaking nl04 if steady H-modes are not accessible. E. If there's enough time, repeat the method in B, C, and D at Ip=600kA, nl04=6e19. F. When the clock strikes 4:00, do a series of ZCUR scans at each Ip that's been successfully tried so far, with ICRF OFF. Insofar as possible, use divertor probes and plenum pressures to "calibrate" SSEP. |
| Physics Operators Plans |
| Entered: Oct 14 2009 03:26:24:160PM |
| Author: Robert Granetz |
Engineering setup for Thursday 2009/10/15
MP527 - H-mode SSEP scans
Session leaders: J. Hughes
Physics operator: R. Granetz
Overnight: usual ECDC in D2 and 60 C bake
Run will start at 09:00 and end at 17:00.
Power systems as on 1080125013 (5.4T, 0.8 MA, 3MW ICRF, ZCUR stepping up
twice during the H-mode to produce steps in SSEP.
A-coil configuration: +Dtop -Dbot -Jtop +Jbot; Enabled (standard
configuration)
Gas Setup:
fill B-Top with 6 psi D2 Hybrid enabled (PG4)
fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1)
leave B-side upper as is Hybrid DISABLED (PG2)
fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3)
leave NINJA as is DISABLED
Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo
Torvac setup: keep gate valves open during PULSE
Specific diagnostics: standard set plus fast magnetics, reflectometry.
Highly desired: HIREX, divertor probes, passive edge CXRS
------------------------------------------------------------------------------
Boronization: no
ICRF Setup: All three transmitters in run-on by 08:30
LH Setup: no
DNB: no
Cryopump: no
------------------------------------------------------------------------------
Run plan: SSEP jogs; Load from 1080125013; recall all magnetics predictors
in seg 2 to bring them up-to-date. Zero segs 3 & 4. Import seg
1 from Wednesday (1091014019). (I did all this the day before
today's run and saved it in /home/granetz/pcs_scratch as shot
1091015000.)
Additional info from session leader:
"This shot needs to be tweaked however. The outer strike should be
moved out of the tungsten trouble area. Simultaneously, I'd like
to match the R-positions of the upper and lower x-point. This is
because of an outstanding concern that, in these SSEP scans,
triangularity changed when we transitioned from LSN to USN.
For the first shot though, let's see if we can just repeat
1080125013. I'll have RF tune on the latter part of the shot"
See the session leader's run plan in the logbook for detailed
information.
|
| Session Leader Summaries |
| Entered: Oct 15 2009 05:05:45:947PM |
| Author: Jerry Hughes |
| Here are the data I collected from today's run:
Time Alternator speed (RMP) ---- ---------------------- 09:21 814 10:21 924 11:11 ~1200 14:06 814 14:54 1152 15:34 1057 At no point did the alternator obtain full speed. There were no attempts at shots. On the positive side, I got a lot of email answered. |
| Physics Operator Summaries |
| Entered: Oct 15 2009 04:06:42:643PM |
| Author: Robert Granetz |
Run summary for Thursday 2009/10/15
MP527 - H-mode SSEP scans
Session leader: J. Hughes
Physics operator: R. Granetz
Today's run was scrubbed due to the recurring problem with the torque transfer control on the
2000 HP motor on the generator. The generator never made it past speed 3. Work was carried out
all day to try to solve the problem, but as of the close-of-business today, the problem had not
been resolved. Work will continue tonight on this problem.
Scorecord: 0 plasmas
0 duds
0 fizzles
0 power supply tests
0 no-power MDS shot cycles
--------------
Total: 0 shot cycles
|
| Session Leader Comments | |||
| Oct 15 2009 04:09:07:673PM | 1091015001 | Jerry Hughes | Run is delayed due by alternator issues. It had slowed down to ~770RPM but
looks like it is starting to spin back up. Actually, as of 9:21 it looks like its frozen at 814. _______ 10:21 924 RPMs and rising. _______ 11:11 Got up to ~1200 RPM then dropped back down to the 800s _______ 12:08 Up and down again. There is a report that the alternator will be delayed >=2 more hours. _______ 14:06 Sitting at 814 RPM. _______ 14:54 1152 and rising _______ 15:34 1057RPM and rising. It's like we're watching the Dow. _______ 16:08 While I was napping, the run was finally scrubbed. |
| Physics Operator Comments | |||
| Oct 15 2009 09:24:26:760AM | Robert Granetz | Loaded saved shot 1091015000 from /home/granetz/pcs_scratch. See comment under PO_PLAN for details of the setup. | |
| Oct 15 2009 09:25:47:620AM | Robert Granetz | The start of the run is delayed due to a recurring problem bringing the alternator up to speed. Problem is with transfer to speed 3 (again). | |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |