| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Jim Terry,Alex Ince-Cushman |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Andy Pfeiffer,Sam Pierson,Gary Dekow |
| Engineering Operator Run Comment |
| Field Reversal and Edge Poloidal Rotation - MP 437 Session Leader: A Inc |
| Session Leader Plans |
| Entered: Dec 5 2005 04:21:54:943PM |
| Author: Alex Ince-Cushman |
| Session Leader Plan - 1051202
Field Reversal and Edge Poloidal Rotation - MP 437 Session Leader: A Ince-Cushman Physics Operator: B Granetz This 1/2 run day will consist of two parts 1) A series of EDA-H modes in LSN, DN and USN (if there is enough RF power) 2) A series of inner wall limited plasma with an elongation scan Part 1 Achieve steady-state EDA H-modes in mix of LSN, DN & USN plasmas with larger than usual neon and argon puffs. Try to find a balance between impurity density (spectroscopic signals levels) and plasma performance. - Get two good shots for each (LSN, DN & USN). Part 2 Switch to limited plasmas and perform a scan in elongation. Since NeSoX has a fixed horizontal view of the plasma, varying the elongation will change the range in minor radius in the NeSoXs view. - Get two shots at each of k~1.6, k~1.3, k ~1.0 If time permits, try changing the vertical position of a diverted plasma. SETUP: Key diagnostics: Hirex, NeSoXs, Thomson, Edge Thomson, GPC, Bolometer arrays, McPherson, Chromex, CXRS, scanning probe Gas puffs: Argon/Neon puff: 40ms at 0.3s (Neon at 2psi, Argon at 1psi) Part 1) EDA H-modes ----------------------------- Load shot 1050727028, or possibly a similar shot from the first half of the run day. Key parameters are Bt= 5.6 T Ip= 0.8 MA NL_04 (target)=1.0e20 m-2 RF waveform: 3MW Flat top ON at 0.7, OFF at 1.3 Part2) Inner wall limited ------------------------------- The following shots will be loaded for the kappa scan 1.6 -> 1051109017 1.4 ->1050819002 1.2 -> 1050615025 |
| Entered: Mar 15 2006 09:45:19:883PM |
| Author: Jim Terry |
| Session Leader Plan for 1st half of run 1051202:
MP 442 - " Radial Structure and k_theta Variation of the QC Mode" Session Leader: J Terry Physics Operator: B Granetz Plan: 1) Achieve steady-state EDA H-mode with 0.7 cm outer gap and NINJA GPI gas puff; Make sure QCM is seen on fast-diode poloidal array; this may reguire a small change in the outer gap. Get two good EDA shots with GPI and PCI data 2) Sweep the outer gap from 0.7 cm (R_sepx=89.8 cm) to 1.9 cm (R_sepx=88.6 cm). This sweeps the QCM across the fast-diode views 4,5,6,7 (which have the highest radial spatial resolution). The sweep should occur from 0.95 s to 1.08 s, i.e. in 0.13 s. This will also facilitate a high resolution measurement of the pedestal Te profile using heterodyne ECE, as well as an Edge TS measurement of the Te and ne pedestal profiles. Get at least two good EDA shots with this sweep and with good GPI and PCI data. SETUP: ECDC overnight in He Load shot 1050727028. This shot had a long steady-state EDA H-mode. The key parameters are Bt=5.6 T (for the ECE heterodyne system) Ip=0.8 MA NL_04 (target)=1.0e20 m-2 BUT change the outer gap to 0.7 cm, i.e. sepx at R=89.8 cm, during RF ON period. This puts the QCM at the location of the GPI's poloidal array of fiber views RF waveform: ~50ms ramp ON at 0.7 s, ramp to 2MW RF off at 1.3 s gas puff: NINJA plenum fill to 10 PSI Deuterium puff at A-B limiter - start 0.8 s, open for 0.15 s Key diagnostics: PCI GPI fast-diode arrays heterodyne ECE Edge TS PCI setup - k_R range from -11cm-1 to 11cm-1 - digitizer time at least from 0.6 to 1.4 s fast-diode system setup: digitizer start - 0.95 s radial array views: 3,4,5,6,7,23,9,10,11,12,13,14 (from R=88.1 cm to 91.6 cm) poloidal array views: 31,32,33,34,35,9,23,36,37,38,39,40 (from Z=0.3 cm to -4.2 cm) initial diode assignments, transfer fiber, views, and F/no's are: diode trans view F/no 1 GPI#1 OUTER SOL 14 F/1.4 2 GPI#2 OUTER SOL 13 F/2.8 3 GPI#3 Inner SOL C F/1.4 4 GPI#4 OUTER SOL 4 F/1.4 with Anti-Aliasing filter (SN Y6413) 5 GPI#5 OUTER SOL 6 F/1.4 with Anti-Aliasing filter (SN D4863) 6 #39 OUTER SOL 38 F/4.0 7 #40 OUTER SOL 5 F/1.4 with Anti-Aliasing filter (SN D4864) 8 #41 OUTER SOL 31 F/2.8 9 #42 OUTER SOL 32 F/2.8 10 #43 OUTER SOL 33 F/2.8 11 #44 OUTER SOL 7 F/1.4 with Anti-Aliasing filter (SN 6412) 12 #45 OUTER SOL 35 F/4.0 13 #46 OUTER SOL 36 F/4.0 14 #47 OUTER SOL 10 F/2.8 15 #48 OUTER SOL 11 F/2.0 16 #49 OUTER SOL 12 F/1.4 17 #50 OUTER SOL 37 F/4.0 18 #51 OUTER SOL 9 F/2.8 19 #52 OUTER SOL 23 F/4.0 20 #20 OUTER SOL 40 F/2.8 21 #21 OUTER SOL 34 F/4.0 22 #22 OUTER SOL 13 F/2.8 23 #23 OUTER SOL 3 F/1.4 |
| Physics Operators Plans |
| Entered: Dec 1 2005 05:16:54:450PM |
| Author: Robert Granetz |
Engineering setup for Friday 02 Dec 2005
MP 442: Radial struct of QC mode (1/2 day)
MP 437: Edge poloidal rotation (1/2 day)
Session leader: J. Terry (#442), A. Ince-Cushman (#437)
Physics operator: R. Granetz
Overnight ECDC in ** HELIUM ** and bake at 60 C.
Run begins at 09:00 and ends at 17:00.
Power systems as on 1050727028.
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 DISABLED (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 Leave DISABLED
Enable the following gate valves and shutters, assuming no vacuum problems:
ECE, VUV, Z-bolo shutters
Torvac setup: Gate valves open
No between-shot boronization.
Key diagnostics: PCI, GPI fast-diode arrays, heterodyne ECE, Edge TS
Note: PCI setup - k_R range from -11 cm-1 to +11 cm-1; digitizer time at
least from t=0.6 to 1.4 s.
-------------------------------------------------------------------------------
ICRF Setup: 2 MW total (J not necessary if D+E=2 MW); 50 ms rampup starting
at t=0.7 s, ramp up to 2 MW. RF off at t=1.3 s.
-------------------------------------------------------------------------------
Run plan: For first MP, load from shot 1050727028 except reduce outer gap
to 7 mm (by increasing RCUR by 1.5 mm). 150 ms NINJA puff at A-B
limiter, starting at t=0.8 s.
For 2nd MP, a mix of LSN, DN, USN, and Limited shots with
larger-than-usual neon and argon puffs. Scan elongation of
inboard-limited shots.
|
| Session Leader Summaries |
| Entered: Dec 2 2005 05:23:45:540PM |
| Author: Jim Terry |
| Summary for the 1st half of the 1051202 run:
We executed MP 442 "Radial Structure and k_theta Variation of the QC Mode" Session Leader: J Terry Physics Operator: B Granetz After a slow start during which 2hrs were lost due to computer problems, we had a very successful run. The major findings are: 1) We made good k_R measurements of both the QC fundamental and 1st harmonic using the PCI. These are measurements at the top and bottom of the plasma. 2) We made good k_theta measurements of both QC fundamental and 1st harmonic using the poloidal array of the fast-diode GPI system. 3) We observed the fundamental and many harmonics of the QC mode on the fast magnetic B_dot diagnostics. The higher harmonics are possibly due to beating with a possible TAE mode at ~600 kHz. (The increased sensitivity of the B_dot coils may be due to the fact that we had a very small outer gap, 0.4 cm). 4) We were successful in dynamically scanning the outer gap. This moves the QCM across the radial array of the fast-diode system. Indeed, as expected, we see the QCM come and go on the different radial channels of the array. Analysis of the radial structure will come later. The key shots for this work are: Shot 011: Steady-state EDA with QCM wavenumbers observed by PCI and GPI. Many harmonics on magnetics. Outer gap is 3-4 mm. Shot 013: Steady-state EDA with QCM wavenumbers observed by PCI and GPI. Many harmonics on magnetics. Outer gap is 3-4 mm. Shot 014: Swept outer gap from 0.4 cm up to 1.4 cm during the period from 0.95 to 1.08 s Shot 015: Swept outer gap from 0.4 cm up to 1.6 cm during the period from 0.95 to 1.08 s Shot 016: Swept outer gap from 0.4 cm up to 1.6 cm during the period from 0.95 to 1.08 s Shot 017: Steady-state EDA with QCM wavenumbers observed by PCI and GPI. Many harmonics on magnetics. Outer gap is 3-4 mm. Shot 018: Steady-state EDA with QCM wavenumbers observed by PCI and GPI. The data are not as good as from shots 011 and 013. Many harmonics on magnetics. Outer gap is 3-4 mm. These were very good plasmas for steady-state EDA plasmas with strong QC modes. |
| Entered: Dec 2 2005 09:10:47:680PM |
| Author: Alex Ince-Cushman |
| Session Leader Summary
MP 437 - Field Reversal and Edge Poloidal Rotation -------------------------------------------------- Session Leader: A Ince-Cushman Physics Operator: B Granetz This run was supposed to have two parts: - EDA H-modes in LSN, DN & USN - Inner-wall limited discharges with a scan in elongation Due to some computer related delays the elongation scan and DN discharges had to be abandoned. The LSN EDA H-modes discharges were excellent and provided some of the best data so far from the NeSoXs diagnostic. Preliminary analysis from these shots suggest edge poloidal rotation of ~40km/s with transient "kicks" of 5~10km/s associated with L-H(in the positive direction) and H-L (in the negative direction) transitions. The strength of the kicks was highest on the outer most channel (larger r/a) and weakest on the inner ost channel, consistent with the view that the strongest poloidal flows are in the edge/pedestal region. The kicks on the H-L transitions were systematically larger than those seen on L-H. The shots that show these effects most clearly are 11, 12 and 15. All Neon/Argon puffs began at 0.3s Shot#_ _Topo_ _RF_ _H-mode type_ _Puff_ _NeSoXs Timing mode_ 1 LSN - - - Shot integrated 2 no power - - - - 3 test - - - - 4 LSN 1MW EDAs - Data acq problem 5 LSN 1MW EDAs - Shot integrated 6 LSN 2MW 1 EDA - Shot integrated 7 LSN 2MW 1 EDA 40ms@2psi Shot integrated 8 LSN 2MW EDAs 40ms@2psi 5-chords, 95ms-dt 9 no power - - - - 10 LSN 2MW EDAs 40ms@2psi 5-chords, 95ms-dt 11 LSN 2MW 1 EDA 40ms@2psi 5-chords, 95ms-dt 12 LSN 2MW 1 EDA 40ms@2psi 5-chords, 95ms-dt 13 LSN 2MW 1 EDA 40ms@2psi 5-chords, 95ms-dt 14 LSN 2MW 1 EDA 40ms@2psi Data acq problem 15 LSN 2MW 1 EDA 40ms@2psi 5-chords, 95ms-dt 16 LSN 2MW 1 EDA 50ms@2psi Data acq problem 17 LSN 2MW 1 EDA 40ms@2psi 5-chords, 95ms-dt 18 LSN 2MW 1 EDA 60ms@2psi 1-chords, 35ms-dt 19 LSN - - 60ms@3psi 5-chords, 95ms-dt 20 LIM ~3MW - 40ms@2psi 5-chords, 95ms-dt 21 USN 3MW Elm-free 40ms@2psi 5-chords, 95ms-dt 22 USN 3MW Elm-free 50ms@2psi 5-chords, 95ms-dt 23 USN - - 60ms@2psi 5-chords, 95ms-dt 24 USN - - 60ms@2psi 5-chords, 95ms-dt |
| Physics Operator Summaries |
| Entered: Dec 2 2005 05:25:01:007PM |
| Author: Robert Granetz |
Physics operator summary for Friday 02 Dec 2005:
MP 442: Radial struct of QC mode (1/2 day)
MP 437: Edge poloidal rotation (1/2 day)
Session leaders: J. Terry (#442), A. Ince-Cushman (#437)
Physics operator: R. Granetz
We successfully got through the first miniproposal, although it took more
than half the run. K_theta information on the EDA quasi-coherent mode was
obtained with the vertical H-alpha array. This required numerous tweaks of
the outer gap, vertical position, and density. Then an outer gap ramp was
successfully accomplished on shots 15 and 16. See Jim Terry's report for
the details. There was a major problem with internet communication with
the DPCS, which caused cycle hangs. Shots 2 and 3 were no-power test shots
because of this. We lost roughly two hours to this problem. The shot
cycle hung once more on the init for shot 9. There were no computer
problems after this, however.
Around 14:00 we switched to the 2nd MP, which started off using the
equilibrium developed in the first half, but without the outer gap ramp.
The neon puff was increased to get good signal levels on NeSoX. Towards
the end of the day, we switched to upper null, trying to keep all other
equilibrium parameters the same (outer gap, density, Btor, etcetera). This
took several shots to tweak up. The best shot was 22, which had a number
of short ELMfree H-modes. I recommend starting from this shot for future
runs. The last few shots were plagued by early disruptions, which may have
been due to the enhanced neon puffing, or to the fact that the TCI density
feedback signal was failing, resulting in faulty fueling control.
Scorecard: 21 plasmas
0 duds
0 fizzles
3 power supply tests
--------------
Total: 24 shot cycles
|
| Session Leader Comments | |||
| Dec 2 2005 09:22:25:070AM | 1051202001 | Jim Terry | Plasma, but no RF. Something funny with neutral pressure.
Signals on fast-diodes are quite high for no NINJA puff. Fast-diodes trigger at 0.8 s |
| Dec 2 2005 11:59:24:947AM | 1051202003 | Jim Terry | Test
can use for finding fast-diode offsets |
| Dec 2 2005 12:09:12:790PM | 1051202004 | Jim Terry | plasma - with EDA
EDA not in fast-diodes time window background signal on fast diodes is very high because midplane pressure is very high (this was also the case in our loaded shot 1050727028). Some of the diodes are saturated and none of them have enough increase above background. Therefore go to smaller target density request (NL_04=0.8e20) for next shot. I also changed most of the F/nos after this shot |
| Mar 15 2006 08:58:57:587PM | 1051202005 | Jim Terry | plasma - with EDA for much of data window - gets ragged in 2nd half of window
midplane pressure is lower (0.1 mT) The NINJA puff is 3.85 Torr-l. Changed most of the F/nos after this shot diode pre-puff sig -> post-puff 1 F/1.4 to 2.8 N/A 2 F/2.8 to 4.0 N/A 3 F/1.4 N/A 4 F/1.4 0.08 - 0.18 5 F/1.4 0.08 - 0.28 6 F/4.0 0.18 - 0.68 7 F/1.4 0.07 - 0.21 8 F/4.0 0.27 - 0.79 9 F/4.0 0.21 - 0.70 10F/5.6 0.17 - 0.60 11F/1.4 0.07 - 0.31 12F/5.6 0.19 - 0.73 So most of them increase by a factor of ~3.5 For next shot increase NINJA puff to 639 torr |
| Dec 14 2005 03:19:37:867PM | 1051202006 | Jim Terry | Great plasma - long steady-state EDA
NINJA pressure was 639 Torr NINJA plenum pressure drop was 6.0 Torr-l. Typical signal for diode 5 (View 6) is now 0.47, up from 0.28. This means that now the pre- to during-puff signal ratio has increased from ~3.5 to ~5.5-6 with the larger puff. The innermost view (view 3) now increases from 0.165 V to 0.60 V, i.e. a factor of a little less than 4 - OK The next innermost view (view 4) now increases from 0.095 to ~0.37 V, i.e. a factor of 4. See good QC on views with rho <-0.6 cm Best is on view 3 with rho=-1.3 cm! but don't see it on poloidal array which is on rho =-0.1 cm For next shot reduce the outer gap to 0.4 cm |
| Dec 2 2005 01:25:33:070PM | 1051202007 | Jim Terry | Great plasma - long steady-state EDA
NINJA pressure was 639 Torr See good QC on views with rho <-0.6 cm very weak on poloidal array which is on rho =-0.4 cm view 39 is saturated See 1st harmonic on view 7 diode 11! Move fast-diode window to 0.95 s (back 0.1 s) to give the QC mode time to spin down. Also move NINJA start time back to 0.8 s (was 0.7s) For next shot reduce the outer gap to 0.2 cm |
| Dec 2 2005 01:01:33:913PM | 1051202008 | Jim Terry | Poor EDA
NINJA pressure was 639 Torr See QC on only a few views No QC on poloidal array view 39 is saturated For next shot go back to shot with outer gap at 0.4 cm |
| Dec 2 2005 01:51:25:383PM | 1051202010 | Jim Terry | Good EDA after 0.91 s.
NINJA pressure was 634 Torr Signal for view 39 is good, not saturated. QC is good, but very small on poloidal array, not present on views 38-40. (Better than shot 7 tho.) So move plasma down 0.5 cm to compensate for the fact that the poloidal array is centered beow the midplane. |
| Dec 2 2005 02:07:23:507PM | 1051202011 | Jim Terry | Great EDA for the whole RF pulse
NINJA pressure was 634 Torr QC is good, seen on all of the poloidal views. Best yet. Istvan finds a k_theta!!!! PCI resolves k_R for both fundamental and 1st harmonic. Moving the plasma down seems to have made the difference for the poloidal signals. |
| Dec 2 2005 02:06:38:210PM | 1051202012 | Jim Terry | Dithering EDA during data window
NINJA pressure was 634 Torr Not really usable for k_theta. |
| Dec 2 2005 02:56:02:820PM | 1051202013 | Jim Terry | Great EDA for the whole RF pulse
NINJA pressure was 634 Torr QC is good, seen on all of the poloidal views. Best yet. Istvan finds a k_theta PCI resolves k_R for both fundamental and 1st harmonic. |
| Dec 2 2005 05:18:23:790PM | 1051202014 | Jim Terry | Now sweep the outer gap from 0.4 cm up to 1.4 cm during the period from
0.95 to 1.08 s Good EDA for the whole RF pulse NINJA pressure was 634 Torr QC is good, sweep is seen on radial array of diodes. 1st harmonic seems to have a different time history compared to the fundamental. PCI sees a change in QCM amplitude during sweep. |
| Dec 2 2005 05:19:03:130PM | 1051202015 | Jim Terry | Increase the sweep of the outer gap from 0.4 cm up to 1.6 cm during the period from 0.95 to 1.08 s
Good EDA for the whole RF pulse NINJA pressure was 634 Torr QC is good, sweep is seen on radial array of diodes. 1st harmonic seems to have a different time history compared to the fundamental. PCI sees a change in QCM amplitude during sweep. |
| Dec 2 2005 05:19:36:303PM | 1051202016 | Jim Terry | Repeat the sweep of the outer gap from cm up to 0.96s to 1.6 cm at 1.08 cm
Good EDA for the whole RF pulse NINJA pressure was 634 Torr QC is good, sweep is seen on radial array of diodes. 1st harmonic seems to have a different time history compared to the fundamental. |
| Dec 2 2005 04:18:48:523PM | 1051202017 | Jim Terry | Turned the run over to Alex Ince-Cushman.
Remove the outer gap sweep, returned to outer gap=0.4 cm. Good EDA for the whole RF pulse NINJA pressure was 634 Torr QC is good, Good k-theta from poloidal array. (Not as good as 011 and 013 tho, since frequency feature in time average is broader.) |
| Dec 2 2005 03:28:52:507PM | 1051202018 | Alex Ince-Cushman | NeSoXs set to high speed data acq. setting
Puff stays the same. |
| Dec 2 2005 04:51:57:440PM | 1051202018 | Jim Terry | Good EDA for the whole fast_diode time.
NINJA pressure was 634 Torr QC is good, OK k-theta from poloidal array. (Not as good as 011,013,017) |
| Dec 2 2005 04:53:02:910PM | 1051202019 | Jim Terry | disrupted |
| Dec 2 2005 05:10:08:913PM | 1051202020 | Alex Ince-Cushman | This discharge was based on 1040409017 with a few tweaks.
It was supposed to be USN, but turned out as outboard limited. Neon/Argon puff at 0.3s for 40ms No H-mode, spotty RF Very strong counter current toroidal rotation. |
| Dec 2 2005 04:58:55:240PM | 1051202021 | Alex Ince-Cushman | Neon/Argon puff set at 40ms
NeSoXs signal levels were reduced significantly. |
| Dec 2 2005 04:51:48:283PM | 1051202022 | Alex Ince-Cushman | USN with some elm-fre h-modes.
neon/argon puff = 50ms Enough signal for poloidal rotation measurement |
| Dec 2 2005 04:52:21:627PM | 1051202023 | Alex Ince-Cushman | Another USN shot but it distrupted before the neon signal level got very high.
neon/argon puff length = 60ms |
| Physics Operator Comments | |||
| Dec 1 2005 06:28:19:827PM | Robert Granetz | Loaded segment 2 from 1050727028 and "called" all the magnetics predictors to bring the segment up to date. Also increased RCUR by 1.5 mm in order to reduce outer gap by 3mm (which should give a gap of 7 mm) without changing the inner gap. Segments 1,3, and 4 came from the last shot of yesterday (1051201037). | |
| Dec 2 2005 08:11:32:350AM | Robert Granetz | Since we did ECDC in helium overnight, I've added 3 ms to the pre-fill puff. | |
| Dec 2 2005 09:31:47:990AM | 1051202001 | Robert Granetz | Plasma. Good shot. 0.8 MA, 5.6 T, 1.0e20 m-2. RF didn't fire. Lots of early runaways. Outboard gap = 8+ mm. DNB fired into the plasma at t=1.0 s (60 ms pulse). Next shot: get the RF going. Increase pre-fill by 1 ms. Move RCUR out by 0.5 mm. |
| Dec 2 2005 09:32:36:837AM | 1051202001 | Robert Granetz | We're having a considerable delay while Josh checks into a problem with the shot cycle servers. |
| Dec 2 2005 09:48:30:180AM | 1051202002 | Robert Granetz | No power shot...big problems with the shot cycle. Almost no data was recorded for this shot. Also, the DPCS failed to get through its init. Josh is working on it. |
| Dec 2 2005 10:55:17:240AM | 1051202002 | Robert Granetz | Next shot: reduce nl_04 to 0.9e20 m-2 (from 1.1), in hopes of reducing the large amount of gas puff fueling that was observed on shot 1. |
| Dec 2 2005 11:16:11:820AM | 1051202003 | Robert Granetz | No-power shot cycle. Hung on the RF stuff. |
| Dec 2 2005 11:45:51:070AM | 1051202004 | Robert Granetz | Jim Terry required a cell access after this shot in order to adjust apertures and such. This is because of the higher-than-expected neutral gas pressure, which will require a larger NINJA puff. |
| Dec 2 2005 11:57:33:930AM | 1051202004 | Robert Granetz | Plasma. Good shot. Got 1 MW from E, nothing from D. This was still enough to give us some EDA H-modes. Edge pressure was still very high, indicating that the plasma is not sucking up the gas like it should. Outer gap = 7 mm. DNB fired into the plasma at t=1.0 s. Next shot: repeat to get the additional 1 MW from D. Also lower nl_04 to 0.8e20 m-2 (from 0.9e20). |
| Dec 2 2005 12:10:51:820PM | 1051202005 | Robert Granetz | Plasma. Good shot. 1 MW from E. D turned on and briefly got to a MW, but then faulted. The slightly lower density finally resulted in a much decreased gas fueling demand, and so the neutral pressure stayed reasonably low on this shot. Outer gap is 6 mm. Next shot: repeat for D-antenna, and for adjusting the NINJA puff. |
| Dec 2 2005 12:27:34:553PM | 1051202006 | Robert Granetz | Plasma. Good shot, and this time we got both D and E antennas, for a total of 2 MW. Very good, constant, long EDA H-mode. Outer gap = 7-8 mm. DNB fired into plasma at t=1.0 s. Next shot: enable 40 ms puff of Ar/Ne mixture at t=0.3 s for Alex. Also decrease outer gap by 4 mm (to 3 mm) by moving RCUR out by 2 mm throughout the flattop. |
| Dec 2 2005 12:48:36:710PM | 1051202007 | Robert Granetz | Plasma. Another really good, long, steady EDA H-mode. Outer gap is 4 mm. Prf=2 MW. Wth=110 kJ. Next shot: Tweak Btor by adding 1 kA to Itor (requested by Amanda). Also reduce the outer gap by another 2 mm (increase RCUR by 1 mm). |
| Dec 2 2005 12:56:29:053PM | 1051202008 | Robert Granetz | Plasma. Good shot. Outer gap is 2.5 mm. EDA H-mode is not as good (more dithering, lower Wth). There was a big impurity injection at 0.83 s. Prf=2 MW, very clean. Next shot: go back to 4 mm outer gap. |
| Dec 2 2005 01:05:36:647PM | 1051202009 | Robert Granetz | No power shot. The cycle hung in init. |
| Dec 2 2005 01:35:36:460PM | 1051202010 | Robert Granetz | Plasma. Good shot. Prf=2 MW, clean. Long EDA H-mode, interrupted by another big impurity injection. Wth is back to 105 kJ. Outer gap is about 4 mm. Btor=5.64 T. Next shot: move ZCUR downwards by 5 mm. |
| Dec 2 2005 01:47:27:337PM | 1051202011 | Robert Granetz | Plasma. Good shot. Very nice, steady, long EDA H-mode. ZMAGX moved down by 0.5 cm, as requested. Outer gap stayed at 4 mm. Prf=2 MW. Wth=105-110 kJ. Next shot: repeat, no changes. |
| Dec 2 2005 01:59:23:553PM | 1051202012 | Robert Granetz | Plasma. Good shot. EDA H-mode was not as good. Actually is started out okay, but then suddenly degraded partway through. Prf=2 MW, clean. Next shot: repeat, no changes. |
| Dec 2 2005 02:13:35:070PM | 1051202013 | Robert Granetz | Plasma. Good shot. Nice steady, long, EDA H-mode. Prf=2 MW, clean. Outer gap = 4 mm. Next shot: scan the outer gap from 4 to 16 mm over the time 0.95-1.08 s. |
| Dec 2 2005 02:22:52:337PM | 1051202014 | Robert Granetz | Plasma. Good shot. Beauty of an EDA H-mode. Outer gap scanned from 3 mm to 13+ mm over the correct time range. Prf=2 MW. Next shot: increase outer gap scan to 17 mm (move RCUR in another 2 mm) over the same time range. |
| Dec 2 2005 02:35:50:460PM | 1051202015 | Robert Granetz | Plasma. Good shot. Very nice, steady, EDA H-mode. Prf=2 MW, clean. Very nice ramp of outer gap from 3 mm to 16+ mm. Next shot: increase Ar/Ne puff to 50 ms (from 40 ms). We will now switch MP's and session leaders. Alex Ince-Cushman will now be the session leader. We will still keep the gap sweep for now. |
| Dec 2 2005 02:47:54:367PM | 1051202016 | Robert Granetz | Plasma. Good shot. Good EDA H-mode. Good outer gap scan. Next shot: remove the outer gap scan. Keep the outer gap at 4 mm. |
| Dec 2 2005 03:03:48:130PM | 1051202017 | Robert Granetz | Plasma. Good shot. Good EDA. Prf=2 MW. Outer gap = 3 mm (and steady). Next shot: increase Ar/Ne puff to 60 ms. |
| Dec 2 2005 03:27:20:600PM | 1051202018 | Robert Granetz | Plasma. Good shot. Good EDA. Good 2 MW of RF. The central TCI trace screwed up, but neither Jim Irby nor Rick Murray are around to fix it. Next shot: increase neon partial pressure in plenum to 3 psi (from 2 psi). |
| Dec 2 2005 04:27:00:540PM | 1051202019 | Robert Granetz | Plasma. Disrupted. I guess the neon is too much now. Next shot: load and activate segment 3 from 1040409017, an 0.8 MA upper null discharge, into segment 3. Change Btor, nl_04, RCUR, and ZCUR to give the same field, density, outer gap, and vertical position as the preceding shots today, except with an upper null. Also needed to re-"call" all the magnetics predictors. |
| Dec 2 2005 04:27:48:367PM | 1051202020 | Robert Granetz | Plasma. This was limited on the outboard limiter. RF didn't cope well with this. Note that I am running this equilibrium from segment 3. Next shot: reduce RCUR a few mm to get a finite outer gap and a diverted equilibrium. |
| Dec 2 2005 04:14:49:523PM | 1051202021 | Robert Granetz | Plasma. Disrupted at t=1.22 s. This shot toggled between USN and limited. The TCI signals all failed, and perhaps the density feedback failed as well. Next shot: reduce RCUR by another 2 mm (increase outer gap by 4 mm). Sam Pierson is checking on the TCI, since neither Jim Irby nor Rick Murray are around. |
| Dec 2 2005 04:25:43:630PM | 1051202022 | Robert Granetz | Plasma. Good shot. Upper null. Prf=3.2 MW. Some short ELMfree H-modes. TCI signal is okay on this shot. Next shot: increase target density nl_04 to 0.9e20 m-2 to favor EDA H-modes. Also increase Ar/Ne puff back to 60 ms. |
| Dec 2 2005 04:42:44:727PM | 1051202023 | Robert Granetz | Plasma. Disrupted at t=0.58 s. It might have been an impurity injection, but the core x-rays were rising for much of the shot, so it might have been the neon. The TCI feedback failed again. We also pulled a breaker. Cell access for Sam to work on the TCI laser alignment. Power room access for checking the breaker. Next shot (if we can squeeze it in): reduce Ar/Ne puff to 50 ms. |
| Dec 2 2005 05:05:35:163PM | 1051202024 | Robert Granetz | Plasma. Short and disruptive. The TCI density signal failed, causing the gas valve to open fully and kill the plasma early. There was also a lot of dust particles very early in the discharge. End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:03:04:460AM | Plasma | Ok | |
| 2 | 09:42:13:837AM | Plasma | Bad | igor error |
| 3 | 11:08:38:240AM | Test | Ok | |
| 4 | 11:28:39:443AM | Plasma | Ok | |
| 5 | 11:58:46:663AM | Plasma | Ok | |
| 6 | 12:12:20:100PM | Plasma | Ok | |
| 7 | 12:29:10:587PM | Plasma | Ok | |
| 8 | 12:47:59:053PM | Plasma | Ok | |
| 10 | 01:23:38:117PM | Plasma | Ok | |
| 11 | 01:37:18:803PM | Plasma | Ok | |
| 12 | 01:49:48:053PM | Plasma | Ok | |
| 13 | 02:02:06:867PM | Plasma | Ok | |
| 14 | 02:14:40:757PM | Plasma | Ok | |
| 15 | 02:28:23:443PM | Plasma | Ok | |
| 16 | 02:40:50:100PM | Plasma | Ok | |
| 17 | 02:55:29:227PM | Plasma | Ok | |
| 18 | 03:10:24:943PM | Plasma | Ok | |
| 19 | 03:27:51:430PM | Plasma | Ok | |
| 20 | 03:46:44:240PM | Plasma | Ok | |
| 21 | 03:59:34:337PM | Plasma | Ok | |
| 22 | 04:17:04:740PM | Plasma | Ok | |
| 23 | 04:29:45:740PM | Plasma | Ok | |
| 24 | 04:52:44:830PM | Plasma | Ok | |