| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Anne White,Mike Churchill |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Bill Cochran,Roza Tesfaye,Gary Dekow |
| Engineering Operator Run Comment |
| MP#680 Reduction of core turbulence and transport across the LI transiti |
| Session Leader Plans |
| Entered: Sep 20 2012 10:24:34:323AM |
| Author: Anne White |
| Morning Experiment: MP 680 L-I transition studies
Morning SL: A. E. White *************************** Morning Setup ************************** Shape from 1120917029 5.58 T, Ip = 1.1 MA, nl04 = 0.7 standard overnight ECDC Gas set-up : if Hbottom is still having problems, then do a Ne/Ar mix in B-SIDE-LOWER: 2 psi Ne + 1 psi Ar. If Hbottom is behaving, the we can have a standard gas setup for Hirex in Hbottom (1 psi I think), and use Bside lower for neon. That may be better in case we don't want neon on every shot. No CRYO if DNB is available, we would like to use it for short intervals ~ 200 ms to gather data simultaneously with gas puff CXRS to catch the forward L-I transition. However, since the beam may still be injecting gas after firing, we would only want this on the last shot or two, since it will perturb the end of the plasmas. ICRF - as much power as available at least 3.5 MW No LH *************************** Morning Shot Plan ************************** Shot plan (< 14 shots): step 1 : L-mode fiducial shot with good HIREX data. load shot 1120917029. RF on steady from 0.4 sec to 1.5 sec, use slow ramp as in shot 29. Steady power at 1.5MW. Repeat shot until we verify good HIREX data signals. CXRS puff at end of L-mode phase, e.g. at 1.3 sec. (1-2 shots) step 2: locked mode calibration shot for HIREX, load most recent successful Locked Mode shot. (1-2 shots) step 3: Load L-mode shot from step 1. Develop a shot with L-I transition triggered by RF step at 1.0 seconds. RF on at 0.4 sec. 2.0 MW from t = 0.6-1.0 sec. Step up to 3.5 MW at 1.0 sec, steady out to 1.5 seconds. CXRS puff at 1.3 seconds. Scan density and Ip as needed to secure "best" L-I transition: clean reduction of edge turbulence, Te pedestal, WCM (hopefully) and reduction of core turbulence. Not an H-mode. (2-4 shots) step 4: document forward L-I transition with CXRS by repeating best L-I transition shot from step 3 and bringing CXRS puff on earlier in time (e.g. gas hits at 0.9 seconds). (1-2 shots) step 5: vary timing of CXRS puff as needed to document forward L-I transition with CXRS by repeating best L-I transition shot from step 3 and bringing CXRS puff on at different time (e.g. gas hits at 0.95 seconds). (1-2 shots) step 6: if available, document forward transition with DNB based CXRS. (1-2 shots). |
| Entered: Sep 20 2012 01:27:33:870PM |
| Author: Mike Churchill |
| This run will focus on I-modes with ideal diagnostic setup for edge CXRS (NINJA puffs at will, L-gap scans, and an upgraded set of deuterium light photodiodes (measuring Dbeta)).
Intentional transitions into H-modes will also be run, to compare between I-mode and H-mode, as it appears the I-mode doesnâ??t support an in-out impurity density asymmetry, while the H-mode does. A clear transition to an asymmetry in the impurity density during the same shot would provide clear evidence to support this. Required Diagnostics: edge CXRS, both NINJA plenums filled with 10psi D2, edge TS PART 1: I-modes Start with a 1.1MA I-mode shot from earlier in the morning (base 1120917029), with the following a. R-gap fixed at 1.7cm (no R-gap changes during shot) RF 3MW from 0.7s-1.2s, then 4MW from 1.2s to 1.5s b. 1.1MA adding the following: 1. Add L-gap scan of -4mm from 0.9 to 1.05s, and later of +4mm from 1.3s to 1.45s c. 1.3MA without L-gap scan d. 1.3MA with L-gap scan PART 2: I-H Attempt if enough RF power available (4 MW+) a. Repeat good shot from PART 1, but change RF to RF 3MW from 0.7s-1.0s and 4.5MW from 1.0s-1.2s (try getting into H-mode). Things to try if not initially successful: 1. Drop outer leg into the slot (does this respond the same in reverse field as forward?) 2. Decrease Btor, for HFS heating. Use this is reducing injections from the limiters becomes important. b. Repeat 2.1., adding a gap scan across the I-H transition |
| Entered: Sep 21 2012 09:12:31:140AM |
| Author: Bob Mumgaard |
| Incase we get to it, though it doesn't look promising. Here is the SL plan for the last hour or the day:
Today at the end of the run we will take some beam into gas w/ fields shots as part of calibrating/characterizing the MSE diagnostic. This is (loosely) part of MP 647. MP 647: Evaluation of MSE issues SL: Mumgaard PO: Wolfe Previous data from quiescent ohmic shots this campaign shows several conclusions. Below is the conclusion and the proposed beam into gas experiment: Conclusion 1) That the statistical variation in the MSE polarization angle measured from the beam is higher than we expect. When looking at the ISC during a discharge the statistical uncertainty scales nearly properly with signal level and is what we expect from previous measurements made invessel. However, when viewing the beam, for a given signal level the variability of the polarization angle is a factor of 2-3 larger than we expect. Uncertainty due to background subtraction does not account for the discrepency for most shots leading us to suspect something in the beam is fluctuating causing the polarization angle to fluctuate. We don't know what this could be. we would like to rule out problems with background subtraction. Proposed experiment: Look at beam into gas w/ fields thereby eliminating the polarized background. Measure the variability in the polarization angle from the beam and compare to the variability from the ISC and invessel experiments at similar signal levels. 2) Althought the polarization uncertainty during the beam pulse is higher than expected it does behave statistically within a given pulse but not beam pulse to beam pulse. Dividing up the pulse into different bin sizes and comparing the variation within a pulse shows that the standard error is properly describing the variation of the polarization angle within the beam pulse. However, between adjacent beam pulses the polarization angle changes outside of this standard error by a factor of 2-3 in quiessent plasmas. This looks as if everytime the beam fires something changes in the velocity disrupution or pointing angle of the beam (keep in mind we're worrying about things on the 0.05deg level). We would like to see if this conclusion holds for beam pulse trains significantly different than what we usually run, this could give clues to what might be changing. Proposed experiment: Change the beam modulation during a beam into gas pulse w/ fields. Compare the variabilty of a unmodulated beam with one with only infrequent modulation and one with the standard modulation. Bin the data different ways and see if the above conclusion continues to hold as we exend the beam on periods. 3) We do not know how the variability of the beam polarization angle scales with MSE signal level. In order to obtain this we need to keep the beam at constant parameters but vary the signal level by varying the excitation of the beam. Proposed experiment: Beam into gas w/ fields with a torus pressure scan within the discharge. This will change the excitation of the beam and thus increase the signal level allowing us to determine how the variability in beam polarization angle scales with photon rate. The proposed experiments encompass 4 beam into gas w/ field shots: 1) A normal modulated beam at constant pressure and field 2) An unmodulate dbeam at constant pressure and field 3) A partly modulated beam into gas at constant pressure and field 4) A normal modulated beam with a gas pressure scan at constant field. The gas pressure is specified to maximize the MSE signal The vertical field is specified to minimize the effect of secondary neutral emission ==============REQUIRED SUBSYSTEMS================= DNB (will not run without) no plasma Note: We will be pulsing EF4 and EF3 to get vertical field. The other EF coils will likely need to be open to avoid inducing currents in them. ============Required Diagnostics================== MSE-DNB gside mks DNB tank and duct mks DNB spectrometer ============Desired Diagnostics================== BES fibers into Kaiser spectrometer ============Gas setup================== Working gas species: D2 Disable all gas except fueling gas ================ Shot Plan =============================================== Considerations for DNB and field: The goals is to get the MSE spectrum into the MSE filters. We would like this to be at 5.4T and 40+kV. However, if the beam cannot perform at 40+kV we can use the beam at a lower voltage and compensate for the Doppler shift with a larger Stark shift via a higher field. We'll discuss this after observing the beam performance during the prior day. + + + Take a few DNB shots into the calorimeter with the following timings: Timing 1: Start at 0.5s 80ms on, 20ms off 10 pulses Timing 2: Start at 0.5s 1000ms on, 0ms off 1 pulse Timing 3: Start at 0.5s 300ms on, 20ms off 3 pulses + + + + TF field to 5.4T, (see note above) Shot 1: Reference shot 1070529010 Changes: EF4 to -0.33kA, Reverse EF3 for reverse field Goal gas pressure: 0.8mTorr. See shot 1120621027 for approximate timing. Beam timing 1 Shot 2: No power shot, beam into gas w/o fields Beam timing 1 Shot 3: No changes to gas or fields Beam timing 2 Shot 4: No changes to gas or fields Beam timing 3 Shot 5: No changes to fields Goal: Gas pressure scan within a shot from ~0.5mtorr to 2.5mtor See shot 1070529008 for timing Shot 6: No power shot beam into gas w/o fields with same gas timing as shot 5 Total of 4 power shots and 2 no power shots After the run take a few beam into calorimeter shots with the different timings and with the bending magnet on/off |
| Physics Operators Plans |
| Entered: Sep 20 2012 04:03:38:907PM |
| Author: Steve Wolfe |
| Physop Plan and Engineering Setup for Friday, Sept 21, 2012
PO: wolfe MP#680 Reduction of core turbulence and transport across the LI transition SL: White (9am to 1pm) MP#718 Effect of poloidally-localized sources on in-out asymmetries SL: Churchill (1pm to 5pm) MP#647? Beam into gas with fields SL: Mumgaard (5pm to 6pm) ----------------- Engineering Setup ----------------- Run begins at 09:00 and ends at 18:00 Power systems as on: 1120917029 Acoil: -Dtop +Dbot +Jtop -Jbot (standard reverse field) Hybrid Enabled Gas setup: Fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 2 psi Neon 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 H-bot with 1psi Argon Hybrid ENABLED (PG5) fill "F-port" NINJA with 8 psi D2 DISABLED fill "C-port" NINJA with 10psi He DISABLED Enable gate-valves and shutters: ECE, VUV, HiREX Sr, Xeus/LoWEUS Leave z-bolo shutter as is (should be open) Torvac gatevalve toggle (yes/no): no Boronization(yes/no): no Overnight ECDC (yes/no): YES, standard D2 2e-4 Torr ICRF(yes/no): YES all available transmitters LH(yes/no): no Cryopump (yes/no): no DNB (yes/no): Yes, starting late morning? Vessel temperature: 45/45/45 ------------------------------ ECDC Parameters (if requested) ------------------------------ gas and pressure: D2 at 2e-4 Torr sweep: 44/45/103 cm scan: 20/120 s ***************************************************** Physop plans Morning plans (MP680, L-I transitions) -------------------------------------- 1. Start from 1120917029 (5.6T, 1.1MA, nl04=7.7e19) and establish L-mode fiducial, diagnostics Note: there is concern about H-bot piezo, may need to add 1psi argon to B-side lower. Note puff (and pressures) from 1120917031 for reference. 2. Locked mode calibration shot (most recent may be 1120830005, seg4) 3. Resume from Step 1 shot, power step to get L->I transition, scan Ip and ne to optimize (in the eye of the SL) Watch gh limiter and shoelace heating, 4. Document transition with CXRS 5. Looks to me like the same as step 4, anyhow no PCS changes 6. Continue documentation with DNB along with CXRS puff Afternoon plans (MP718, boron asymmetry) Probably need to pump and purge "C-port" NINJA plenum and refill with D2 1. Start from I-mode target from morning run (based on 1120917029) set outer gap at 1.7cm, if it isn't already Run lts of RF, watch out for shoelace heating! 2. Add L-gap scan: -4mm from 0.9s to 1.05s, hold to 1.3s, then back to original clearin at 1.45s. RCUR the same timing but -2mm swing to keep outer gap constant. 3. Go to 1.3MA (probably gives q95 < 3), no gapscan 4. Repeat 1.3MA with gap scan (should be ok if #3 was ok, since the scan makes it fatter) 5. (aka part 2 I-H in SL_PLAN) Raise power trying for H-mode a. If no H-mode at max useable power, then try moving outer strike into slot b. Try decreasing Btor to reduce H-mode threshold? and move resonance to HFS 6. It we get an H-mode, then add a gap scan across time of transition (and hope the scan doesn't affect the transition) post-5pm plans (MP647 beam-into-gas with fields): Engineering power setup from 1070529010. Torus gate valves closed in pulse Disable all piezos except for B-top; remember to disable NINJA Load from seg1 of 1070529010, flip currents and voltages, Call or zero wires #4 and 6 (zxl and bz_0), turn off dpcs_fizzle (or change the shot number to satisfy polarity) and change EF4 current from -2000A to +330A, per SL (per sds) instruction. Copy pg4 waveform from 1120621027 seg1 (for steps 1-4): pg4 at 100V from -.4 to -.1sec. ** Do steps 1-4 of sl plan. Recover pg4 waveform from 1070529010 (or 008) for pressure ramps. ** Do steps 5-6 of sl plan Turn off all segments except seg1. DO NOT turn off any trees! |
| Session Leader Summaries |
| Entered: Sep 21 2012 06:13:11:680PM |
| Author: Mike Churchill |
| Overall a succesful experiment. Shots 20-24 we had a number of issues at the beginning with accessing I-mode, and the C-port NINJA plenum. We changed to fire both capillaries on F-port plenum, and going to shorter, higher RF pulses, which produced a number of high performance I-modes (25, 26, 28, 29), with and without inner-gap scans.
The H-mode proved elusive. We tried several configuration changes: ramping the density, steping the RF power, putting the outer leg into the slot, lowering the current, lowering the field, all to no avail. We produced a number of good looking I-mode shots, however. It's unclear what the issue was, we were at parameters close to older shots from 1120824 and 1120828 where we accessed H-modes. It may be our radiated power was too high, or small differences in elongation. The new HFS Dalpha photodiodes worked well, and we should have a good set of I-mode data to compare LFS and HFS impurity density. |
| Entered: Sep 22 2012 03:36:20:700PM |
| Author: Anne White |
| Summary for MP 680 : Run during the morning of 9/21
MP 680 is an experiment to document changes in core and edge turbulence simultaneously across the L-I transition. The half day experiment for this morning had the goal of producing a repeatable L-I transition and documenting the changes in Te-tilde/Te with CECE, the edge flow profiles with CXRS, edge turbulence with GPI, and core flows with HIREX. The first half of morning we were able to easily produce a low density target (nl04 ~ 0.77) and access L-I transitions reliably and repeatably using a sharp RF step up in power from 1.5 MW to 3.5 MW. Shots 4/5/6/7/8 form the complete set of shots forming the data set of interest. In between shot analysis (caveat emptor) of CECE fluctuation levels indicated a 30% reduction in normalized electron temperature fluctuations measured at rho = 0.85. This is larger than reductions (15%) previously seen in the density fluctuations as measured with reflectometry at a similar radius in similar plasmas last year. Detailed analysis is needed to carefully quantify the measured reduction in this new experiment. Note that refl. data was also obtained today in the core, but evolving density across the transition will limit the quantitative reduction analysis in these low density targets. The second half of the morning we spent trying to develop a higher density (nl04 0.9-1.0) target, which would provide more extensive measurements of the density fluctuations with reflectometer from the core to the edge, and would put a reflectometer channel (112 GHz, Omode) within radial range of the new tunable CECE channels. We did not have enough power to access I-mode and simultaneously document the transition with CXRS and GPI, due to the increases in density (10-15%) resulting from the puffs. The data set should provide very valuable information for the L-I threshold studies. In addition, we were able to document the fluctuations in the higher density targets. Interestingly, at fixed q and higher density the temperature fluctuation levels were lower in the L-mode prior to the I-mode transition, but a reduction was still measured after the transition. Thank you everyone for a great morning and excellent support from many diagnostic systems!! **** Morning Run Team *** PO: Wolfe SL: White CECE: Howard/Sung Reflectometer: Baek GPI: Terry/Siercho CXRS: Theiler/Churchill HIREX: Gao/ Reinke* (*remotely from England!) GPC: Hubbard TS: Walk Z-Czar: Chilenski* (*is owed one sombrero) RF: Lin PCI: Ennever Polarimeter: Bergerson others I will need to update... |
| Physics Operator Summaries |
| Entered: Sep 21 2012 06:21:03:050PM |
| Author: Steve Wolfe |
Physop Summary for Friday, Sept 21, 2012
We ran two MP's today between 9:00 and 18:00,
MP680 on L->I transitions and
MP718 on boron asymmetry in I-mode.
The third scheduled experiment needed the DNB, which woke up dead,
so the extra hour got absorbed by the other two experiments.
The machine ran pretty well today, and we completed the first
part of MP680, at 1.1MA and nl04~8e19 by shot#8, and then spent
the rest of the morning,
until ~13:30, trying to repeat the transition documentation at higher
density. This was not so successful. Although we got the L->I transition
for the CECE/reflectometer overlap,
the diagnostic puffs for CXRS and GPI were too much for the available power
and prevented fully documenting the condition.
Similarly, we successfully completed part 1 of the second MP,
including one-way gap scans instead of in and back out, in shots#20-29,
including 1.1MA and 1.3MA cases. However, part 2, trying to get an I->H
transition was not successful. Everything we tried either stayed in I-mode
or transitioned back to L-mode.
Startup was robust, with only one (post-disruption) fizzle. Three shots
disrupted before flattop or in early flattop before full RF power. The
rest made it into rampdown. Most of the 1.3MA cases in the afternoon
disrupted between 1.55 and 1.6sec, and it turned out this was because
the OH1 was hitting its 26kA current rail; should have noticed earlier
and extended the limit to 30kA, which I did after shot#30.
The GH limiter and shoelace antenna took some punishment, but survived.
It was necessary to shorten or reduce the RF pulse in several conditions
in response to incandescence on the shoelace wires. RF got up to 5MW,
despite limitations on the D-port antenna around 0.6MW.
The DNB crew managed to remove and reinstall the cathode using cell
accesses between shots, without delaying the run. By the end of the
day they were working the arc back up to about where it had been
a day or so ago, which may be enough to do the remaining beam-based
experiments next week.
Scorecard:
Tests/No Power 0
Duds 0
Fizzles 1
Plasmas 34 (including 3 disruptions before full RF)
======== ==
Shots 35
|
| Session Leader Comments | |||
| Sep 21 2012 09:21:19:193AM | 1120921001 | Anne White | MP 680 L-I transition studies: Morning
first shot of morning run Plan: L-mode fiducial. Bt = 5.5 T, Ip = 1.1 MA, nl04 ~ 0.7, Prf = 1.5MW, steady from t = 0.4 sec to 1.5 sec. NINJA puff (CXRS+GPI) at 1.3 sec. Result: shot ran . looks ok. density is higher than request, but puff is off early. natural evolution. CECE positions look good. Next shot: locked mode calibration shot for HIREX |
| Sep 21 2012 09:29:33:187AM | 1120921002 | Anne White | MP 680 L-I transition studies: Morning
Plan: Locked mode calibration shot Result: locked early, but ended at 0.55 sec, not enough time to get clean data with high signal levels Next shot: locked mode calibration shot |
| Sep 21 2012 09:51:43:253AM | 1120921003 | Anne White | MP 680 L-I transition studies: Morning
Plan: Locked mode calibration shot Result: HIREX (C. Gao) was happy with this for calibration purposes. Next shot: Move to step 3. Develop L-I transition target. Bt = 5.5 T, Ip = 1.1 MA, nl04 ~ 0.7 (request). RF power 1.5 MW from t = 0.4-1.0 sec. RF power up to 3.5 MW from t=1.0-1.5 sec. NINJA at 1.3 seconds. |
| Sep 21 2012 10:08:50:473AM | 1120921004 | Anne White | MP 680 L-I transition studies: Morning
Plan: Start step 3. Develop L-I transition target. Bt = 5.5 T, Ip = 1.1 MA, nl04 ~ 0.7 (request). RF power 1.5 MW from t = 0.4-1.0 sec. RF power up to 3.5 MW from t=1.0-1.5 sec. NINJA at 1.3 seconds. Result: Good target LI transition Next shot: repeat for CECE data. step down RF power to 1.5 MW at 1.3 sec. |
| Sep 21 2012 10:16:24:810AM | 1120921005 | Anne White | MP 680 L-I transition studies: Morning
Plan: Repeat L-I target shot 4. still in step 3 of run plan. Bt = 5.5 T, Ip = 1.1 MA, nl04 ~ 0.7 (request). RF power 1.5 MW from t = 0.4-1.0 sec. RF power up to 3.5 MW from t=1.0-1.3 sec. NINJA at 1.3 seconds. Result: good documentation shot for CECE Next shot: move to step 4 of run plan. Move CXRS puff early in time to catch forward L-I transition. Keep GPI puff at 1.3 seconds. |
| Sep 21 2012 10:27:11:627AM | 1120921006 | Anne White | MP 680 L-I transition studies: Morning
Plan: Start step 4 of run plan. Document L-I target shot 4/5 with CXRS. Bt = 5.5 T, Ip = 1.1 MA, nl04 ~ 0.7 (request). RF power 1.5 MW from t = 0.4-1.0 sec. RF power up to 3.5 MW from t=1.0-1.3 sec. CXRS puff earlier and GPI at 1.3 seconds. Result: good shot for CXRS documentation. Gas hits at 1.0 sec. LI transition around 1.05 sec or so. Next shot: continue step 4. bring GPI puff on early (gas hits at 1.0 sec) and CXRS on at 1.3 sec. |
| Sep 21 2012 10:47:47:800AM | 1120921007 | Anne White | MP 680 L-I transition studies: Morning
Plan: Continue step 4 of run plan. Document L-I target shot 4/5/6 with GPI. Bt = 5.5 T, Ip = 1.1 MA, nl04 ~ 0.7 (request). RF power 1.5 MW from t = 0.4-1.0 sec. RF power up to 3.5 MW from t=1.0-1.3 sec. GPI puff earlier and CXRS at 1.3 seconds. Result: shot ran. good shot. Next shot: reduce outer gap from 1.7 cm to 0.9 cm for GPI data documentation. |
| Sep 21 2012 11:08:12:360AM | 1120921008 | Anne White | MP 680 L-I transition studies: Morning
Plan: Continue step 4 of run plan. Document L-I target shot 4/5/6/7 with GPI. Reduce outer gap from 1.7 cm to 0.9 cm for GPI data documentation. Bt = 5.5 T, Ip = 1.1 MA, nl04 ~ 0.7 (request). RF power 1.5 MW from t = 0.4-1.0 sec. RF power up to 3.5 MW from t=1.0-1.3 sec. GPI puff earlier and CXRS at 1.3 seconds. Result: good shot. got 1.0 cm outer gap for GPI. This completes the documentation of the low density L-I target. Next shot: Keep RF timing , BT and Ip same. Move up in density. nl04~ 1.0. Develop target at higher density. Then document according to steps 3 4 and 5 for CECE/REFL/CXRS an GPI. Shots 4/5/6/7/8 form the low density data set with L-I documentation. |
| Sep 21 2012 11:16:22:403AM | 1120921009 | Anne White | MP 680 L-I transition studies: Morning
Plan: Begin development of higher density L-I target (begin in shot plan at step 3, but now at higher density). Outer gap to 1.0 cm for GPI. Bt = 5.5 T, Ip = 1.1 MA, nl04 ~ 1.0 (request). RF power 1.5 MW from t = 0.4-1.0 sec. RF power up to 3.5 MW from t=1.0-1.3 sec. GPI and CXRS at 1.3 seconds. Result: did not get RF power we wanted. need to repeat. Next shot: Try again at development of higher density L-I target (nl04~1.0). Signal levels on HIREX were low, so decrease time resolution a bit. |
| Sep 21 2012 11:33:32:177AM | 1120921010 | Anne White | MP 680 L-I transition studies: Morning
Plan: Continue development of higher density L-I target Bt = 5.5 T, Ip = 1.1 MA, nl04 ~ 1.0 (request). RF power 1.5 MW from t = 0.4-1.0 sec. RF power up to 3.5 MW from t=1.0-1.3 sec. GPI puff and CXRS at 1.3 seconds Outer gap is 1.0 cm Result: shot ran. no transition to I mode. Next shot: increase RF power request to 4.5 MW from t = 1.0-1.3 sec. keep nl04 request =1.0 sec to overlap refl and cece. Move NINJA puff slightly earlier to gas hit at 1.28 sec to catch back transition. |
| Sep 21 2012 11:45:12:807AM | 1120921011 | Anne White | MP 680 L-I transition studies: Morning
Plan: Continue development of higher density L-I target . RF power up to 4.5 MW from t=1.0-1.3 sec. Bt = 5.5 T, Ip = 1.1 MA, nl04 ~ 1.0 (request). RF power 1.5 MW from t = 0.4-1.0 sec. GPI puff and CXRS at 1.28 seconds Outer gap is 1.0 cm Result: shot ran. no transition to I-mode Next shot: reduce nl04 request to 0.9. keep RF power request and all else the same. |
| Sep 21 2012 12:04:53:123PM | 1120921012 | Anne White | MP 680 L-I transition studies: Morning
Plan: Continue development of higher density L-I target, reduce nl04 request to nl04 ~ 0.9 . RF power 1.5 MW from t = 0.4-1.0 sec. RF power up to 4.5 MW from t=1.0-1.3 sec, then back to 1.5MW. Bt = 5.5 T, Ip = 1.1 MA. . GPI puff and CXRS at 1.28 seconds Outer gap is 1.0 cm Result: shot ran. doesn't look like a L-I transition. Next shot: up in current to 1.2 MA. reduce nl04 request to 0.85 |
| Sep 21 2012 12:22:53:120PM | 1120921013 | Anne White | MP 680 L-I transition studies: Morning
Plan: Continue development of higher density L-I target, reduce nl04 request to nl04 ~ 0.85, which should still be high enough to overlap REFL and CECE with tunable channels. RF power up to 4.5 MW from t=1.0-1.3 sec. Bt = 5.5 T, Ip = 1.1 MA(request). RF power 1.5 MW from t = 0.4-1.0 sec. GPI puff and CXRS at 1.28 seconds Outer gap is 1.0 cm Result: nice I-mode with WCM features, but later after RF step, around 1.2 sec when RF comes on steady. Next shot: reduce RF power request to try and get steady power |
| Sep 21 2012 12:34:19:987PM | 1120921014 | Anne White | MP 680 L-I transition studies: Morning
Plan: Continue development of higher density L-I target, reduce nl04 request to nl04 ~ 0.85, which should still be high enough to overlap REFL and CECE with tunable channels. RF power up to 4.3 MW from t=1.0-1.3 sec. Bt = 5.5 T, Ip = 1.1 MA(request). RF power 1.5 MW from t = 0.4-1.0 sec. GPI puff and CXRS at 1.28 seconds Outer gap is 1.0 cm Result: shot ran, good L-I transition around 1.1 sec. Next shot: repeat. CXRS documents forward transition. Gas hits at 1.0 sec. |
| Sep 21 2012 12:43:25:153PM | 1120921015 | Anne White | MP 680 L-I transition studies: Morning
Plan: document higher density L-I target shot 14 with CXRS at 1.0 seconds. Outer gap is 1.0 cm. Result: shot ran, but looks like puff was too much, no I-mode. Next shot: repeat for documentation, back off on CXRS puff amount. |
| Sep 21 2012 12:57:39:450PM | 1120921016 | Anne White | MP 680 L-I transition studies: Morning
Plan: document higher density L-I target shot 14 with CXRS at 1.0 seconds. Outer gap is 1.0 cm. Result: shot ran, but looks like reduced CXRS puff was too much again, no I-mode. Next shot: repeat for GPI documentation. assess how low to go on CXRS puff |
| Sep 21 2012 01:14:52:890PM | 1120921017 | Anne White | MP 680 L-I transition studies: Morning
Plan: document higher density L-I target shot 14 with CXRS at 1.0 seconds. Outer gap is 1.0 cm. Result: shot ran, but looks like GPI puff was too much at this density, no I-mode. Next shot: repeat with nl04 request at 0.7. Puff both CXRS and GPI for documentation, with goal that NINJA puffs bring us up to target density. Gas hits at 0.95 sec. |
| Sep 21 2012 01:24:34:907PM | 1120921018 | Anne White | MP 680 L-I transition studies: Morning
Plan: document higher density L-I target shot 14 with CXRS and GPI documentation. Outer gap is 1.0 cm. Repeat with nl04 request at 0.7. Puff both CXRS and GPI for documentation, with goal that NINJA puffs bring us up to target density. Gas hits at 0.95 sec. Result: disruption. locked mode. Next shot: one more try. next shot will be last shot of morning. |
| Sep 21 2012 01:37:25:350PM | 1120921019 | Anne White | MP 680 L-I transition studies: Morning
Last shot of morning. Plan: document higher density L-I target shot 14 with CXRS and GPI documentation. Outer gap is 1.0 cm. Puff both CXRS and GPI for documentation, with goal that NINJA puffs bring us up to target density. Gas hits at 0.95 sec. Result: looks like a late transition, based on neuts. but some funny aspects.we'll need to look closer. Next shot: Switch to afternoon experiment. Thanks everyone! The morning MP 680 was a success, thanks to the C-Mod Team. |
| Sep 21 2012 02:13:36:243PM | 1120921020 | Mike Churchill | Load lower density shot 1120921007 from today.
PLAN: 1.1MA, 0.77 nl04, R-gap 1.7cm, no L-gap scan RESULT: Plasma disrupts at 1.2s. First part looks decent, though comes out of I-mode. NEXT: Repeat. Increase first power step to 3.5MW, see if it sustains the first I-mode. |
| Sep 21 2012 02:31:47:933PM | 1120921021 | Mike Churchill | Load lower density shot 1120921007 from today.
PLAN: 1.1MA, 0.77 nl04, R-gap 1.7cm, L-gap scan RESULT: Good I-mode. HFS capillary didn't fire succesfully (or at least the HFS diodes don't seem to have seen signal). Change to F-port plenum (B-Mid-In). Also, heating up the shoelace antenna, that's a no-no. NEXT: Repeat. Decrease first power step to 3.25MW, push back to 0.8s, cut-off at 1.4s. |
| Sep 21 2012 02:44:12:090PM | 1120921022 | Mike Churchill | PLAN: 1.1MA, 0.77 nl04, R-gap 1.7cm, no L-gap scan
RESULT: Marginal I-mode at the 2nd RF pulse. HFS Dalpha looks much better. No shoelace heating. NEXT: Repeat with L-gap scan, -4mm from 0.9s-1.05s, then +4mm from 1.2s-1.35s. Decrease nl04 demand to 0.7. |
| Sep 21 2012 03:05:14:420PM | 1120921023 | Mike Churchill | PLAN: 1.1MA, 0.7 nl04, R-gap 1.7cm, L-gap scan -4mm from 0.9s-1.05s, then +4mm from 1.2s-1.35s.
RESULT: Hot L-mode. Density increase from RF, then NINJA. NEXT: Drastic changes to try and get I-mode. Ramp RF 0.65s-0.8s. 4MW RF 0.9s-1.2s. Gap scan 1.0-1.15s. Single puff. |
| Sep 21 2012 03:21:37:530PM | 1120921024 | Mike Churchill | PLAN: 1.1MA, 0.7 nl04, R-gap 1.7cm, L-gap scan -4mm from 1.0s-1.15s. RF 4MW from 0.9 - 1.2s
RESULT: I-mode. LFS didn't fire. Something must be wrong with the C-port plenum. NEXT: Repeat. Get the puffs into the machine. |
| Sep 21 2012 03:45:55:993PM | 1120921025 | Mike Churchill | PLAN: 1.1MA, 0.7 nl04, R-gap 1.7cm, L-gap scan -4mm from 1.0s-1.15s. RF 4MW from 0.9 - 1.2s.
RESULT: Great I-mode. LFS and HFS puffs look great, gap scan is really working for us. Thomson didn't fire, so won't have ne, will have to use previous shot. NEXT: Move onto 1.d, 1.3MA. Increase nl04 to 0.8. Won't have Thomson till the shot after. |
| Sep 21 2012 03:59:29:067PM | 1120921026 | Mike Churchill | PLAN: 1.3MA, 0.8 nl04, R-gap 1.7cm, L-gap scan -4mm from 1.0s-1.15s. RF 4MW from 0.9 - 1.2s.
RESULT: Great I-mode. NEXT: Repeat with Thomson. |
| Sep 24 2012 06:09:01:153PM | 1120921027 | Mike Churchill | PLAN: 1.3MA, 0.8 nl04, R-gap 1.7cm, L-gap scan -4mm from 1.0s-1.15s. RF 4MW from 0.9 - 1.2s.
RESULT: Fizzle. NEXT: Repeat. |
| Sep 21 2012 04:25:26:230PM | 1120921028 | Mike Churchill | PLAN: 1.3MA, 0.8 nl04, R-gap 1.7cm, L-gap scan -4mm from 1.0s-1.15s. RF 4MW from 0.9 - 1.2s.
RESULT: Nice I-mode. WCM present NEXT: Move onto 1c, repeat with no L-gap scan |
| Sep 21 2012 04:46:46:713PM | 1120921029 | Mike Churchill | PLAN: 1.3MA, 0.8 nl04, R-gap 1.7cm. RF 4MW from 0.9 - 1.2s.
RESULT: Nice I-mode, RF trip in the middle, shouldn't matter since we don't have a gap scan NEXT: Move onto 2a, I-H mode. 1.1MA, 0.7 nl04, raise to 0.9 nl04 at 1.05s. RF 4MW from 0.9s-1.1s, then 4.5MW from 1.1s-1.3s. |
| Sep 21 2012 04:52:39:603PM | 1120921030 | Mike Churchill | PLAN: 1.1MA, 0.7 nl04, 0.9nl04 at 1.05s, R-gap 1.7cm. RF 4MW from 0.9 - 1.1s, 4.5MW from 1.1.
RESULT: Disruption NEXT: Repeat |
| Sep 21 2012 05:09:29:203PM | 1120921031 | Mike Churchill | PLAN: 1.1MA, 0.7 nl04, 0.9nl04 at 1.05s, R-gap 1.7cm. RF 4MW from 0.9 - 1.1s, 4.5MW from 1.1.
RESULT: I-mode, density rising, Te falling, but no H-mode. NEXT: Increase 2nd RF step to 5MW. Increase nl04 demand to 1.2 during 2nd step |
| Sep 21 2012 05:25:10:373PM | 1120921032 | Mike Churchill | PLAN: 1.1MA, 0.7 nl04, 1.2nl04 at 1.05s, R-gap 1.7cm. RF 4MW from 0.9 - 1.1s, 5MW from 1.1.
RESULT: I-mode, then L-mode after we put a lot of gas into the machine. NEXT: Try moving the outer leg into the slot. |
| Sep 21 2012 05:37:53:897PM | 1120921033 | Mike Churchill | PLAN: 1.1MA, 0.7 nl04, 1.2nl04 at 1.05s, R-gap 1.7cm. RF 4MW from 0.9 - 1.1s, 5MW from 1.1, outer leg into the slot
RESULT: L-mode. Outer-leg in the slot a failure. NEXT: Go to 1120824006 recipe: 1MA, 5.4T, nl04 0.7. RF straight across 4.5MW at 0.9s-1.3s. |
| Sep 21 2012 06:00:22:437PM | 1120921035 | Mike Churchill | PLAN: 1.1MA, 0.7 nl04
RESULT: No H-mode :( NEXT: Done for today |
| Physics Operator Comments | |||
| Sep 21 2012 10:39:11:927AM | Steve Wolfe | Setting up for MP680 Load from 1120917029. I'm going to be using H-bottom for the argon today, will watch to be sure it is actually puffing and doesn't go south during the day. Note that this shot has a pg3 feedforward of 15% starting .5sec, nl04 pid=(3,0,6); program=7.7e19, still a bit of oscillation in pg3. May want to increase pg3, decrease P gain to 2; leave it for now TF_CUR is set to 156264; nice to be precise! If we raise it will need to raise engineering limit from 165. We seem to be back to 200msec ef1 crowbars again; no problem, we don't need the early divert on these. Import seg4 from 1120830005, seg4 (may be the same as is already there), for locked mode shot. This has 200msec pg5 puff, 5e19, 850kA. If we change to mixed Ne-Ar in pg1 have to remember to increase pg1 from 150msec. Load at 21-Sep-2012 07:49:27.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| Sep 21 2012 10:46:03:180AM | 1120921001 | Steve Wolfe | Shot#1: Enabled B-top, B-Main, H-bot, Bside-Lower, NINJA Wait for TS to warm up, will try for ICRF on first shot. DNB is dead, will not operate today, so Mumgaard hour between 5 and 6 will be postponed. DNB team will need frequent cell accesses to begin cathode removal. Change Bt from 5.6 to 5.5T (TF_CURRENT from 156264 to 153475 Load at 21-Sep-2012 09:07:27.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: Plasma to 1.6sec H-bot plenum says .56 units of Ar, no impspec signal yet RF has one fault, 1.5MW, good L-mode, probably too much neon Prad~1.0MW (2pi diode*2.75) nl04=1e20 pg3 turns off after .4sec, so no control yet Bt=5.48T. Next: locked mode calibration |
| Sep 21 2012 10:46:35:520AM | 1120921002 | Steve Wolfe | Shot#2: locked mode calibration Turn off seg2, turn on seg4, NINJA off, set pg1 waveform to zero in seg4 Load at 21-Sep-2012 09:18:45.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: Disrupted at .6sec, probably didn't last long enough, it is locked, but maybe too early Next: try tweaking locked mode shot |
| Sep 21 2012 10:46:58:623AM | 1120921003 | Steve Wolfe | Shot#3: locked mode calibration Add 30V pg3 puff from 200 to 400msec, to keep it from locking too early, hope it doesn't keep it from locking later Load at 21-Sep-2012 09:33:21.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: plasma to 1.66, did it lock? No, it doesn't look like it did. Next: Try not turning on the A-coil at all |
| Sep 21 2012 10:47:18:957AM | 1120921004 | Steve Wolfe | Shot#4:Chi is happy with locked mode shot that didn't lock, so moving on, or back, to step 3 Turn back on seg2, off seg4. No PCS changes, will increase RF and probably get lower density than on shot#1 Load at 21-Sep-2012 09:44:34.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: plasma to 1.7sec Looks like we may have an I-mode starting at just after 1.0sec May have been killed by the evil Ninja nl04 before Ninja is 8.1e19, minimal pg3 puffing after .6sec Some incandescence on the shoelace, may need to curtail RF pulselength Next: Changes in RF and diag settings, no PCS changes |
| Sep 21 2012 10:47:42:047AM | 1120921005 | Steve Wolfe | Shot#5: Changes in RF and diag settings, no PCS changes Result: plasma to 1.65 sec I-mode onset about the same, shorter time at max RF, still lighting up on shoelace, not obviously better but no worse. nl04=7.9e19, tiny little puff late in shot, mostly running off the wall and antennas. Next: No PCS changes, on to documentation step 4 will probably try higher ne and smaller outer gap later |
| Sep 21 2012 10:48:19:040AM | 1120921006 | Steve Wolfe | Shot#6: No PCS changes, trying for reproducible shots for documentation This will be just CXRS, no GPI from NINJA Result: plasma to 1.66sec nl04=8.0e19 in L-mode, dropping a little in I-mode until NINJA puff hits, tiny little pg3 puffing during early I-mode, CXRS NINJA did not kill I-mode Next: More documenting, try GPI early this time No PCS change, No RF time |
| Sep 21 2012 10:41:29:913AM | 1120921007 | Steve Wolfe | Shot#7:try GPI early this time No PCS change, No RF time Result: P,asma to 1.65 looks similar Next: decrease outer gap to 9mm |
| Sep 21 2012 10:57:47:250AM | 1120921008 | Steve Wolfe | Shot#8:decrease outer gap to 9mm (presently 17mm) RCUR from .6585 to .6625 (+4mm on rcur to change gap by -8mm) Load at 21-Sep-2012 10:44:27.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: plasma to 1.65sc, gap is 10mm instead of 8mm, we'll see if JT needs more. Next: increase nl04 to 1.0e20, and drop gap another 1mm |
| Sep 21 2012 11:15:57:567AM | 1120921009 | Steve Wolfe | Shot#9: increase nl04 to 1.0e20, pg3 from 15 to 25 (and now I notice that the pg3 is in fact 0.15, not 15, so it's really been doing nothing all day! OK, change it to 15 then; pid still at (3,0,5.5) JT changed his mind about decreasing the gap by another mm, so put it back to .6625, as on #8 Load at 21-Sep-2012 11:05:42.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: plasma to 1.65sec, I don't think we got an I-mode nl04 is 1.0e20 before the RF step, then 1.1e20 Didn't get all the rf, D-port dropped out Prad is at 1.4MW in L-mode, steps up to 1.5MW; could probably decrease Ne? Next: try again with all the RF, we hope |
| Sep 21 2012 11:28:49:193AM | 1120921010 | Steve Wolfe | Shot#10: No pcs changes, try again with all the RF, we hope Result: plasma to 1.65sec; pulse length is stable No I-mode again. D is still choppy, but it should have gone if 3.5MW is enough. Next: will try increasing RF power to 4.5MW |
| Sep 21 2012 11:41:48:263AM | 1120921011 | Steve Wolfe | Shot#11: will try increasing RF power to 4.5MW, no PCS changes Result: plasma to 1.65 sec, I don't think we got a transition D is still choppy, averaging 4MW Next: try asking for nl04=0.9e20 |
| Sep 21 2012 12:06:58:177PM | 1120921012 | Steve Wolfe | Shot#12: try asking for nl04=0.9e20, drop pg3 feedforward to 10% Load at 21-Sep-2012 11:44:15.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Brian will poke the ASP at 0.5sec (conditioning) Result: plasma to 1.65sec (or a little longer) Still no transition, nl04 at .95e20 There was a spike on zmeter at 12msec on this shot, not seen elsewhere Next: try going to 1.2MA |
| Sep 21 2012 12:16:03:930PM | 1120921013 | Steve Wolfe | Shot#13: try going to 1.2MA from 1.1MA, trying to get the transition at the higher density. There seems to be some debate as to whether there actually was an I-mode on #12 Also drop nl04 demand to 8.5e19 Load at 21-Sep-2012 12:02:30.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: plasma to 1.65; msde it at q95 le 3 Looks like a transition at 1.17sec or so, still some rf choppiness Prad is dropping during rf Next: try backing the RF power demand down to keep it from faulting right after the step |
| Sep 21 2012 12:26:30:793PM | 1120921014 | Steve Wolfe | Shot#14: try backing the RF power demand down to keep it from faulting right after the step No PCS changes Result: plasma to 1.65, looks like an I-mode with more stable RF 4.1MW Neutrons are up, Wmhd to 173kJ Next: document with CXRS and GPI |
| Sep 21 2012 12:41:56:067PM | 1120921015 | Steve Wolfe | Shot#15:document with CXRS, no PCS changes Result: plasma ok, but did not get I-mode CXRS Puff may have prevented the transition D was a little ratty again Next: repeat with smaller puff |
| Sep 21 2012 12:56:46:650PM | 1120921016 | Steve Wolfe | Shot#16:document with CXRS again, no PCS changes Result: plasma ok, but no transition again Punt the CXRS and try the GPI puff, which is smaller (maybe) |
| Sep 21 2012 01:11:50:333PM | 1120921017 | Steve Wolfe | Shot#17: Punt the CXRS for now, and try the GPI puff, which is smaller (maybe) No PCS changes Result: plasma, no transition. Reduce target nl04 to 7e19, puff both at once |
| Sep 21 2012 01:24:14:763PM | 1120921018 | Steve Wolfe | Shot#18: Reduce target nl04 from 8.5 to 7.0e19, puff both at once Load at 21-Sep-2012 13:13:33.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: disrupted at .56sec, well before RF step Locked mode starts at .51, density too low early. Probably too short for lm cal shot. Too bad! Next: try again, little higher target nl04 |
| Sep 21 2012 01:39:17:790PM | 1120921019 | Steve Wolfe | Shot#19: try again, little higher target nl04 Raise target at .5sec to 8.0e19, then 7.5 from .65s to EOF Load at 21-Sep-2012 13:28:10.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Didn't drop pg4 after the disruption, hope it's ok Result: plasma into rampdown. Got an I-mode late, I think Injection at 1.12 complicates things. End of MP680. Next: on to MP718 |
| Sep 21 2012 02:09:52:340PM | 1120921020 | Steve Wolfe | Shot#20: on to MP718 Import seg2 of shot#7 from this morning and change RF program, no gap scan yet, RCUR at .6585, Ip=1.1MA, nl04=7.7e19 Load at 21-Sep-2012 13:42:35.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Long delay to get NINJA plenum purged and refilled Result: Disrupted at 1.2sec, Mo injection I think RF was on at 3MW from .7sec, didn't make it to the next step. Mo trace looks to me like a sudden injection, not a melt event. Next: repeat, drop pg4 a little for post-disruption |
| Sep 21 2012 02:23:00:690PM | 1120921021 | Steve Wolfe | Shot#21: repeat, drop pg4 from 20 to 18ms for post-disruption Increase RF power to 3.5MW in first step Load at 21-Sep-2012 14:11:35.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: plasma into rampdown, 1.7sec Shoelace wire glowing after shot, too hot! Mo injection at 1.35sec kills the I-mode There is an issue with the HFS NINJA puff Next: SL will request shortening of RF pulse |
| Sep 21 2012 02:35:41:757PM | 1120921022 | Steve Wolfe | Shot#22: SL will request shortening of RF pulse from both ends Hold CLEARIN const at 0.00 until 1.5sec, it had been ramping from 1.35 Load at 21-Sep-2012 14:24:58.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: plasma to 1.71sec That got a good looking I-mode, no injections Shoelace looks healthy Next: inner gap scan |
| Sep 21 2012 03:02:05:710PM | 1120921023 | Steve Wolfe |
Shot#23: inner gap scan at [0.9,1.05,1.2,1.35]sec,
CLEARIN [0.0,-.004,-.004,0.]
RCUR [.6585,.6565,.6565,.6585]
decrease nl04 to 7.0e19
Load at 21-Sep-2012 14:43:11.00
Open tree /home/wolfe/pcs_scratch -1
Open tree done
Result: plasma to 1.7sec, fewer neuts in second step
Looks like it didn't get an I-mode, power looks the same
Next: change rf and scan time and puff
|
| Sep 21 2012 03:21:43:963PM | 1120921024 | Steve Wolfe |
Shot#24: One-way inner gap scan at [1.0,1.15]sec, and leave it there to EOF
CLEARIN [0.0,-.004]
RCUR [.6585,.6565]
leave nl04 to 7.0e19
RF will go up and shorten, with ramp up earlier
Load at 21-Sep-2012 15:09:00.00
Open tree /home/wolfe/pcs_scratch -1
Open tree done
Result: plasma to 1.75 got I-mode at 0.92sec
Couple of faults on D and E, some injections during I-mode
Shoelace is lighting up pretty bright
Didn't get the outer gas puff
Next: repeat with both inner and outer from the same plenum
|
| Sep 21 2012 03:29:03:647PM | 1120921025 | Steve Wolfe | Shot#25:repeat with both inner and outer from the same plenum No PCS changes plasma to 1.7sec, looks like an I-mode, more neuts, higher & flatter Wmhd than 24 Shoelace maybe a little better, still glowing Two rf dropouts, not too bad CXRS got both puffs Next: Go to 1.3MA, Bt=5.7 |
| Sep 21 2012 03:54:01:953PM | 1120921026 | Steve Wolfe | Shot#26: Go to 1.3MA from 1.1 nl04 to 8e19, pg3 to 15 (from .15) Bt=5.7: TF_CURRENT from 153475 to 160000 (should be 159636, but I'm sick of random extra precision). Raise TF current limit to 170. from 165kA Load at 21-Sep-2012 15:37:22.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Lab access for TS and ECE Result: plasma into rampdown, 1.55sec Looks like a nice hot I-mode, wmhd=175kJ q95=2.85, Bt=5.69T, nl04=9.2e19 in I-mode before puff Shoelace heating is better Next: repeat this with TS, then remove the gap scan |
| Sep 21 2012 04:05:50:787PM | 1120921027 | Steve Wolfe | Shot#27: repeat this with TS, then remove the gap scan No intentional changes, except drop pg4 to 17msec since it was a pretty big disruption Load at 21-Sep-2012 16:00:25.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done IGT=3.1e-6 at INIT, 4.2e-6 in check (some valve opened?) Result: fizzle, pressure was up some at bd to .06mTorr, despite lower pg4, might have fizzled anyway. Next: repeat |
| Sep 21 2012 04:18:10:663PM | 1120921028 | Steve Wolfe | Shot#28: repeat, except slow down the EF4 step at EOF Load at 21-Sep-2012 16:10:33.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: plasma to 1.55s again, got I-mode, but rampdown disruption is still bad. Maybe I should keep it diverted longer? Looks like a pretty good repeat of 26 Next: take out the gap scan |
| Sep 21 2012 04:36:59:697PM | 1120921029 | Steve Wolfe | Shot#29: take out the gap scan Slow down the CLEARIN ramp in rampdown, Extend the TF pulse to 1.7sec Reduce pg4 to 15msec Load at 21-Sep-2012 16:23:24.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: plasma to 1.63sec, better? I-mode has a little glitch, but ends up ok We're getting an inner wall contact at 1.5sec that is not programmed, starting 1.4sec; not sure why. Looks like OH1 is on current rail, which was at 26kA; change to 30kA. Next: Try for an I->H |
| Sep 21 2012 04:52:39:520PM | 1120921030 | Steve Wolfe | Shot#30:Try for an I->H, Put in an RF step at 1.1sec Reload #25 and remove the gap scan, add a density step to 9e19 at 1.05sec, change pg3 to 15V and put back 5.7T (160kA) OH* current limits from 26 to 30kA Load at 21-Sep-2012 16:45:14.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: disrupts at .29sec, Mo injection at .27sec Next: Try again |
| Sep 21 2012 05:04:40:700PM | 1120921031 | Steve Wolfe | Shot#31:Try again for an I->H, Put in an RF step at 1.1sec From #30, we did: Reload #25 and remove the gap scan, add a density step to 9e19 at 1.05sec, change pg3 to 15V and put back 5.7T (160kA) OH* current limits from 26 to 30kA No PCS changes, since PG4 is already at 15msec Result: plasma to rampdown 1.725 Got an iMode, but no H-mode Next: Ask for 1.2e20 at 1.1sec, more RF |
| Sep 21 2012 05:18:52:863PM | 1120921032 | Steve Wolfe | Shot#32: Ask for 1.2e20 at 1.1sec, more RF, raise pg3 to 30% at 1.1sec Try for even more RF Load at 21-Sep-2012 17:08:19.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: plasma to rampdown, possible H-mode late? No I think it's just the density program working and it's an I->L Next: Back off nl04, try moving outer strike into slot |
| Sep 21 2012 05:31:54:353PM | 1120921033 | Steve Wolfe | Shot#33: Back off nl04, try moving outer strike into slot RXL from -.005 to -.02 ZXL from .01 to -.01 Load at 21-Sep-2012 17:24:47.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: plasma to 1.72, no H-mode Maybe no I-mode either Slot doesn't help Next: reload #30, remove density step and drop Ip to 1MA |
| Sep 21 2012 05:49:52:040PM | 1120921034 | Steve Wolfe | Shot#34: reload #30, remove density step and drop Ip to 1MA Drop Bt to 5.45T (153kA) Load at 21-Sep-2012 17:37:43.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: plasma to rampdown, Shoelace very hot, so is the limiter, seeing some melting Mo on bolo I think Next: raise initial nl04 to 7.5e19, then raise to 1.e20 and puff pg3 |
| Sep 21 2012 06:00:01:863PM | 1120921035 | Steve Wolfe | Shot#35: raise initial nl04 to 7.5e19, then raise to 1.e20 and puff pg3 Turn off argon (pg5 to 0.0) Load at 21-Sep-2012 17:53:44.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done Result: plasma to rampdown, iMode but no H-mode, just an L-mode from the puff End of Run |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:08:27:370AM | Plasma | Ok | |
| 2 | 09:22:05:883AM | Plasma | Ok | |
| 3 | 09:35:07:657AM | Plasma | Ok | |
| 4 | 09:50:27:723AM | Plasma | Ok | |
| 5 | 10:06:04:410AM | Plasma | Ok | |
| 6 | 10:20:21:643AM | Plasma | Ok | |
| 7 | 10:37:46:653AM | Plasma | Ok | |
| 8 | 10:51:08:140AM | Plasma | Ok | |
| 9 | 11:06:41:453AM | Plasma | Ok | |
| 10 | 11:20:18:810AM | Plasma | Ok | |
| 11 | 11:35:45:480AM | Plasma | Ok | |
| 12 | 11:50:52:807AM | Plasma | Ok | |
| 13 | 12:06:43:300PM | Plasma | Ok | |
| 14 | 12:21:06:543PM | Plasma | Ok | |
| 15 | 12:36:18:997PM | Plasma | Ok | |
| 16 | 12:49:36:440PM | Plasma | Ok | |
| 17 | 01:04:53:870PM | Plasma | Ok | |
| 18 | 01:19:11:347PM | Plasma | Ok | |
| 19 | 01:33:23:570PM | Plasma | Ok | |
| 20 | 01:59:48:410PM | Plasma | Ok | |
| 21 | 02:13:57:117PM | Plasma | Ok | |
| 22 | 02:29:43:743PM | Plasma | Ok | |
| 23 | 02:43:44:800PM | Plasma | Ok | |
| 24 | 03:10:11:747PM | Plasma | Ok | |
| 25 | 03:22:33:840PM | Plasma | Ok | |
| 26 | 03:45:42:917PM | Plasma | Ok | |
| 27 | 04:01:02:053PM | Plasma | Ok | |
| 28 | 04:13:27:810PM | Plasma | Ok | |
| 29 | 04:27:28:437PM | Plasma | Ok | |
| 30 | 04:45:56:190PM | Plasma | Ok | |
| 31 | 04:58:43:187PM | Plasma | Ok | |
| 32 | 05:12:25:567PM | Plasma | Ok | |
| 33 | 05:25:42:977PM | Plasma | Ok | |
| 34 | 05:41:26:077PM | Plasma | Ok | |
| 35 | 05:55:38:520PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Sep 21 2012 09:08:09:150AM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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