Miniproposals

Miniproposal: 133 Date Filed: 12/8/1995 Title: Boronization of Alcator C-Mod First Author: Jim Terry Session Leader: Unknown (shots 1-26)

Miniproposal: 135 Date Filed: 12/18/1995 Title: Deep Tracer-Gas Injection Experiments First Author: Brian Labombard Session Leader: Brian Labombard (shots 27-35)

Engineering Operator Run Comment

MP133, MP135/Wolfe, Labombard

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:18:007PM

Author: To Be Determined

Session Leader's summary of run 980210 MP 135, Influence of Surface Loop Voltage on Recycling Light Asymmetry in Limiter Discharges SL: Labombard PO: Wolfe EO: Silva/Bertolino Idea: The goal of these experiments was to look for any influence that the surface loop voltage might have on the up/down asymmetry in recycling light on the inner wall during limiter discharges. The plan was to program 0.1 MA steps in 0.8 MA inner-wall limited plasmas and monitor the symmetry of the recycling light on the inner wall using the B-side and F-side D-alpha reticon arrays. Also, D-Balmer series emission was to be monitored from the inner wall with the Cromex spectrometer to determine the relative importance of volume versus surface recombination. Result: Amazing enough, the symmetry of the inner-wall recycling light appears to be affected by the current (or loop voltage, or something) perturbations. For moderate density discharges (NL04~ 1), a large up-down asymmetry was generally observed when the loop voltage was high. The asymmetry went away when the loop voltage dropped to zero. Unfortunately since we were not able to reverse the loop voltage (minimum loop voltage was ~ 0) the case for or against a direct relationship between loop voltage asymmetries will not be easy to make. If we had achieved a negative surface loop voltage and had seen the asymmetry reverse, then we would have a much stronger case for loop voltage influence (if,if,if..). Nevertheless, we have some interesting data to sift through. 6 inner-wall limited discharges at 5.3 tesla were obtained: SHOT#27 - 0.8 MA constant current program with NL04 ~ 1.1 This discharge showed an early marfe (.26-.52 seconds). During the current flat-top, the B-side reticon array showed two recycling "lobes" in the inner wall, symmetric about the midplane with emission peaks located at around Z = +/- 5 cm. During the early "marfe", the lower lobe (Z = - 5 cm) was a factor of two or more bigger that the upper lobe. SHOT#28 - Nominally 0.8 MA with five 0.8 to 0.72 MA Ip wiggles. NL04 ~ 1.1 to 1.0. Loop voltage goes from +2 to 0 volts. B-side camera shows large emission in the lower lobe during Ip ramp-up (loop voltage ~2), symmetric emission during ramp-down (loop voltage ~0). Many other things are modulating including outer gap and total radiation. The large asymmetric recycling emissions during the 0.1 MA ramp-up periods are virtually identical to the early 'marfe' emission profiles that occurs during the Ip startup ramp. (...Humm) SHOT#30 - Nominally 0.8 MA with four 0.8 to 0.65 MA Ip wiggles - disrupts at the last wiggle. NL04 ~ 1.1 to 1.0. Loop voltage goes from +3 to slightly negative. Similar D-alpha response as in shot #28 SHOT#32 - Nominally 0.8 MA with five 0.8 to 0.72 MA Ip wiggles. NL04 ~ 1.0. Loop voltage goes from +2 to 0 volts. Even though the density is not much lower, the D-alpha response has changed. Now the B-side camera shows symmetric top-bottom recycling lobes in which BOTH lobes modulate with equal magnitude (~50%) during the Ip wiggles. SHOT#33 - Nominally 0.8 MA with five 0.8 to 0.72 MA Ip wiggles. Requested lower density again but still got NL04 ~ .95 Early marfe is gone. D-alpha response during Ip modulation is virtually identical to shot 32. SHOT#35 -Nominally 0.8 MA with five 0.8 to 0.72 MA Ip wiggles NL04 ~ 1.3. Inner wall marfe is present during the entire shot. Now it appears that the lower lobe on the B-side camera (the 'marfe") is so large that the upper recycling lobe can not be seen. The z-position of the "lower" lobe appears to move up and down during modulation.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:59:427PM

Author: To Be Determined

Physop summary for 980210 (Also session leader summary for part 1 MP133) MP 133 Post-boronization fiducials MP 135 Surface Voltage effect on SOL asymmetries SL: LaBombard (for MP135) PO: wolfe EO: Silva/Bertolino Run Plan for Tuesday, 980210 ============================ Engineering Setup: ------------------ Overnight boronization, followed by 3 hours or more ECDC in He, followed by at least 2 hours ECDC in D2. Gas setup: K-side 30psi deuterium Hybrid Enable B-side lower 1psi argon Disabled B-top 6psi deuterium Hybrid Enable Power Systems: As on 980204001, TF under hybrid control ECE gate valve enabled for first plasma shot. Other gate valves as requested by diagnosticians. Verify all shutters, gate valves, gauges, etc. are back in normal status following boronization. PCS Setup: ---------- Load_from 980204001 (fiducial in segment 4) Import segment 2 from 980120032 (limiter case) and tweak as follows: change title to "0.8MA limiter case" change clearin to -0.05 for all of t<1.5 sec change RCUR to 0.662 for t>.300 change ZCUR to -.01 from t=0.2 to 1.7 Recall algs for wires 2 & 3 Import segment 3 from 980120027 change title to "1.0 MA fiducial-like" Run Plan: -------- Start with standard Tuesday OH test, except: Enable B-top valve for hybrid puff during test shot. Run fiducials until reasonably reproducible startup and plasma operation is regained, or until the cows come home, whichever comes first. Try adjusting pre-puff to compensate for wall pumping, if significant. If sufficiently frustrated by lack of startup, run some additional D2 ECDC. Once fiducials look ok, run some 1MA discharges like 98012027-28. Increase power in second RF pulse if possible. Once conditions are reasonably settled down, run the MP135 discharges. This experiment calls for inner-wall limited plasmas with square-wave modulated loop voltage, to be obtained by programming steps in the plasma current. Start with the 800kA equilibrium used for the limiter phase of shot 980120032, but eliminate the diverted times. No RF on these shots. Once a good limiter plasma is obtained, setup the Ip stepped waveform. Initially, try steps of -/+ 100kA in 50msec intervals, beginning at 0.5sec from an 800kA flattop. Scan density from .85 < nl4 < 1.4e20. If time permits, go back to fiducials, or 1MA high power shots, to check if conditions have changed. Results: ------- Not a bad run, considering. In part I, we ran a series of 800kA cases, initially at nl4=1e20, then at reduced density. RF powers were up to 3MW, and stored energy up to 150kJ in the best of the 800kA shots. On increasing the current, we got two 1MA plasmas (#25 and 26) above 210kJ at 2.7-2.8MW, with neutron rates in the 1.e14/sec range. These are comparable to the Jan 1996 trophy shots, and are the best we've had this year. The electron temperatures reached 4keV. Steve Wukitch still says the absorbed power is only 50-60% even on these, which would make the H-factors the best we've ever seen in EDA. We seem to still be getting gas influx during the RF, which could be wall-conditioning or antenna conditioning. The fizzle rate after boronization was better than last time, but still a struggle especially early in the day. There was no sign of the strong wall pumping observed in January. The RGA didn't seem to have as much boron compounds after shots. On the other hand, the Mo and 2pi radiation were quite low, especially in the 800kA cases, which had P2pi < 200kW. The voltage perturbation, limiter part of the run started with shot 27. The idea was to draw a square-wave modulation on the plasma current to provide a shape-preserving modulated loop voltage, which is supposed to drive up/down asymmetries in the SOL particle flux and/or recycling. This sort of worked. There was a modulation on RCUR, and a little on ZCUR for a 100kA demand. When I doubled the modulation amplitude, the EF2's saturated and the plasma disrupted with a vertical problem (chopper railed), probably caused by unequal saturation of the EF2 voltages. More analysis is required to understand why the EF2's are so strongly driven; it does not seem consistent with the Ip controller. In any case, with a 100kA Ip modulation, the RECON_VAC Vloop signal went from about zero to -2.5V. Note that the EFIT surface voltage trace is generated by numerically differentiating on a 20msec timebase, so it is not useful for estimating the true voltage perturbation; it will be necessary to re-run EFIT on a fast timebase to get a better value. Some effects on the recycling lobes, apparently consistent with the hypothesis, were observed. See Brian's RUN_SUMMARY for details. Shots 28,30,32,33,and 35 are examples with modulation. #30 had too much modulation and disrupted, but did get some times with reverse voltage. We were unable to get the density below 1.e20, but the low puff attempts did show different recycling behavior. NOTE: The fiducial shots and extra power fiducial-like shots #3-20 use seg. #4. The lower density and higher current shots #21-26 use segment #3. The limiter discharges used segment #2. Details: ------- For more details, see the LOGBOOK under the PHYSICS_OPERATOR topic, which is NOT identical to what follows here. Shot 1 Data System exercise Shot 2 Tuesday test; gas puff looks normal, no unusual wall pumping Shot 3 Started from 980204001, a fiducial (in SEG4) from Ian's long string of shots last week. With a small tweak this got a good shot on the second attempt (shot 4). Shot 5-6 both fizzled. Shot 7: tweaked Br by .5mT; might have gone, but EF3 blew fuse/SCR at 12-15msec. Shot 8: After a long delay to chase down bad SCR run an EF3 only test. Looks ok. Shot 9: plasma, good EDA, Steve says 50% absorbed Shot 10: fizzle Shot 11: plasma, just like 9, 110kJ, Rneut=1.e13 Shot 12: fizzle Shot 13: fizzle; Shot 14: drop Br by .0005 and pre-puff by 2msec. plasma, 118kJ, Rneut=1.2e13; slightly better than #11. Shot 15: fizzle. Shot 16: plasma,112kJ,Rneut=1.2e13; similar to 14. Shot 17: plasma,116kJ,Rneut=1.2e13; no obvious change. Next shot raise power. Shot 18: plasma,133kJ,Rneut=2.3e13, Prf=2.5MW. Next shot raise power to 3MW Shot 19: plasma,145kJ,Rneut=3e13, Prf=3MW, big injection at 1.11sec Shot 20: plasma,150kJ,Rneut=3.5e13;3MW still an injection at 1.15sec Next shot drop nl4 to 0.7e20, using segment 3. (Import SEG 4 to SEG 3, and change NL4. Lose the original 1MA shot in SEG 3). Shot 21: plasma,150kJ,3.1e13; two big injections, nl target 0.8e20,gas off from .4sec. Shot 22: fizzle. Shot 23: plasma,120kJ at 2MW; one xmitter drops out. shot 24: plasma,130kJ,2.e13 at 2.7MW, no injections, lower density Shot 25: go to 1MA plasma, 213kJ, 1.e14neut/sec+ at 2.7MW; 2pi ramps up to 600kW. This shot is as good as the trophy shots. Shot 26: Keep RF flat at 2.7MW plasma, 213kJ, 1.e14 very similar to 25. Move on to MP135. Set up limiter discharge, 800kA in Segment 2. Note: Set RF tree noinclude from cmod_manage. This will need to be turned back on for tomorrow. Shot 27: plasma. Good limiter discharge, a little asymmetric. Shot 28: program 5 cycles of current sweeps from 800 to 700kA, starting at .5sec. Also, raise drop ZXL from -.015 to -.025. plasma, marfe seems to move up and down. Not perfect, there is a RCUR modualtion and some ZCUR, but it looks like the effect may be there.Voltage swings just to zero, doesn't cross. shot 29: Increase modulation to 200kA. Decrease nl4 to .8e20 Magnet resistance fault. Try again. Shot 30:plasma disrupts at .92sec, EF2's are railing in V, chopper rails trying to catch vertical excursions. Shot 31:Drop modulation amplitude back to 100KA; decrease nl4 to .7e20 DUD? Fields ok, gas ok. Shot 32: plasma. Still around 1.0e20. shot 33: Drop pg3 voltage program to zero after .2sec; plasma. Still around 1.e20. The inner wall is not unloading. Shot 34: Increase nl4 to 1.2e20, increase pg3 to 30V. fizzle. TF crowbarred late in rampdown. Fairly long delay. Shot 35: Br offset to .0045 from .005 plasma. Got 1.3e20 during modulation. End of Run. Problems: --------- EFIT failed to run on shot 4 (first plasma), because of a quota problem in cmod$models. Large files were removed from cmod$models:[mhd...] so that the RUN_EFIT.COM file could be written. EFIT was run manually for shot 4. On shot 7, EF3 blew a fuse and SCR. It has been so many years since we had any problems with EF3 the engineers couldn't remember quite how to check it out. The SCR was removed, not replaced, and the run continued after a PLC EF3 test on shot 8. Shot 29 had a magnet resistance fault. Joe Bosco was called in to examine the entrails. Shot 34 had a TF crowbar late in rampdown after a fizzle. This was associated with an unexplained alternator inhibit fault. There was one delay for a computer problem, when the engineering operator entry couldn't be logged. Scorecard: ---------- Tests 3 Duds 2 (1 mag. res. fault) Fizzles 10 (1 due to EF3 failure?) Plasmas 20 ------ -- Shots 35

Session Leader Comments
Feb 10 1998 03:16:32:940PM	980210027	Brian Labombard	First limited plasma. 800 kA. Constant Ip program. NL04 - 1.1 Early marfe .26 to .52 sec. B-side camera shows two symmetric recycling lobes after early marfe. During the marfe, the lower lobe (~ recombination light) is much larger than the upper lobe.
Feb 10 1998 03:38:12:390PM	980210028	Brian Labombard	Ip modulation 800 kA to 720 kA. NL4 ~ 1.1. H-alpha shows clear modulation. B-side camera shows larger emission in the lower lobe during ramp-up (loop voltage ~2), symmetric emission during ramp-down (loop voltage ~0). Outer gap also is modulating. Rejean says edge radiation is also modulating. (spatial position or magnitude?) Steve is going to try to increase the modulation amplitude on the next shot.
Feb 10 1998 03:57:17:230PM	980210030	Brian Labombard	Ip modulation 780 kA to 640 kA. NL4 ~ 1. Plasma disrupts at .9 sec (too much modulation!) Similar H-alpha response as shot 28. Still no negative loop voltage. Asymmetry does not reverse, it just goes to zero at zero loop voltage. Next shot lower density, back to original modulation.
Feb 10 1998 04:23:28:630PM	980210032	Brian Labombard	Ip modulation 800 kA to 730 kA. NL4 ~ 1. Did not get the lower density (requested 0.8). But now the B-side camera shows symmetric lobes in which BOTH lobes modulate with equal magnitude.
Feb 10 1998 04:29:53:790PM	980210033	Brian Labombard	Ip modulation 800 kA to 730 kA. NL4 ~ .95 Again, did not get the lower density (requested 0.8). But again, the B-side camera shows symmetric lobes in which BOTH top and bottom lobes modulate with equal magnitude.
Feb 10 1998 05:59:39:320PM	980210035	Brian Labombard	Ip modulation 790 kA to 730 kA. NL4 ~1.3 Now it appears that the lower lobe on the B-side camera is so large that the upper lobe can not be seen. The z-position of the lobe appears to move during modulation.

Physics Operator Comments
Feb 9 1998 06:28:05:370PM		Steve Wolfe	Setting up for tomorrow's run (980210). Load_from 980204001 (fiducial in segment 4) Import segment 2 from 980120032 (limiter case) and tweak as follows: change title to "0.8MA limiter case" change clearin to -0.05 for all of t<1.5 sec change RCUR to 0.662 for t>.300 change ZCUR to -.01 from t=0.2 to 1.7 Recall algs for wires 2 & 3 Import segment 3 from 980120027 change title to "1.0 MA fiducial-like" Load_clean Load at 9-Feb-1998 18:20:22.00 Save as pcs$wolfe 980210999 Do a coldstart (hybinit_dispatch), just to be sure things are up and runnning. Logs look ok.
Feb 10 1998 07:14:22:580AM		Steve Wolfe	coldstart 10-FEB-1998 07:10:14.30 log checks ok.
Feb 10 1998 07:19:41:630AM		Steve Wolfe	Run Plan for Tuesday, 980210 ============================ MP 133 Post-Boronization Fiducials, etc. MP 135 Surface Voltage effect on SOL asymmetry SL: LaBombard (MP135) PO: wolfe Engineering Setup: ------------------ Overnight boronization, followed by 3 hours or more ECDC in He, followed by at least 2 hours ECDC in D2. Gas setup: K-side 30psi deuterium Hybrid Enable B-side lower 1psi argon Disabled B-top 6psi deuterium Hybrid Enable Power Systems: As on 980204001, TF under hybrid control ECE gate valve enabled for first plasma shot. Other gate valves as requested by diagnosticians. Verify all shutters, gate valves, gauges, etc. are back in normal status following boronization.
Feb 10 1998 07:20:32:810AM		Steve Wolfe	Run Plan: -------- Start with standard Tuesday OH test, except: Enable B-top valve for hybrid puff during test shot. Run fiducials until reasonably reproducible startup and plasma operation is regained, or until the cows come home, whichever comes first. Try adjusting pre-puff to compensate for wall pumping, if significant. If sufficiently frustrated by lack of startup, run some additional D2 ECDC. Once fiducials look ok, run some 1MA discharges like 98012027-28. Increase power in second RF pulse if possible. Once conditions are reasonably settled down, run the MP135 discharges. This experiment calls for inner-wall limited plasmas with square-wave modulated loop voltage, to be obtained by programming steps in the plasma current. Start with the 800kA equilibrium used for the limiter phase of shot 980120032, but eliminate the diverted times. No RF on these shots. Once a good limiter plasma is obtained, setup the Ip stepped waveform. Initially, try steps of -/+ 100kA in 50msec intervals, beginning at 0.5sec from an 800kA flattop. Scan density from .85 < nl4 < 1.4e20. If time permits, go back to fiducials, or 1MA high power shots, to check if conditions have changed.
Feb 10 1998 08:21:28:260AM	980210001	Steve Wolfe	Shot #1: Data system-only shot cycle to check if everything on the computer end is working. Got errors on all three TRAQ's; Device not triggered errors. Lots of other camac errors. State was put into standby to synch up before recool was complete; I don't know if that did anything, since a lot of stores are completing. Try doing a recover, using @CMOD$MODELS:[MHD.MAGNETICS]RECOVER_TRAQ_1.TCL, etc. That seems to work. I now have a noise trace for Ip. I think the pulse state just completed too fast.
Feb 10 1998 09:04:36:510AM	980210002	Steve Wolfe	Shot #2: Tuesday OH test. firing B-top valve to check wall-pumping. Get about .05mTorr for a 14msec pulse. This looks normal.
Feb 10 1998 09:13:48:690AM	980210003	Steve Wolfe	Shot #3: First plasma attempt. No changes from original setup. Using Seg 1 & Seg 4. fizzle. Br looks positive, Bz negative.
Feb 10 1998 09:28:20:350AM	980210004	Steve Wolfe	Shot #4: Br from .006 to .005. EF4 from -1345 to -1330. plasma. full length. H-mode, EDA almost at once. H-alpha increases during second RF step. nl4 is very hashy; Irby is working on it. EFIT didn't run.
Feb 10 1998 09:34:18:490AM	980210004	Steve Wolfe	Shot #4: EFIT failed because cmod$mhd was out of quota on cmod$models, so it couldn't create the run_efit.com file. Copied my big save set cj960125014.save to scratch and deleted it; this should make room for next shot. Re-running efit manually. Got 105kJ.
Feb 10 1998 09:41:32:290AM	980210005	Steve Wolfe	Shot #5: Repeat. fizzle. Very slow current rise. Just repeat it a few times.
Feb 10 1998 09:49:43:550AM	980210006	Steve Wolfe	Shot #6: Repeat. Another fizzle. Here we go. I'm supposed to be patient. This one got to 45kA, slow current rise, slightly negatinve br.
Feb 10 1998 10:01:05:170AM	980210007	Steve Wolfe	Shot #7: Br offset from .005 to .0055 fizzle. EF3 had a fuse blow at 13msec. We were up to 45kA, I'll blame this one on the supply.
Feb 10 1998 11:20:43:790AM	980210008	Steve Wolfe	Shot #8: EF3 test after 1hr plus delay to change fuse, hipot, remove SCR; cell access for Nachtreib et al. Looks ok. Set up for another shot/fizzle.
Feb 10 1998 11:34:13:050AM	980210009	Steve Wolfe	Shot #9: Repeat of shot 7. Note that the Argon leak has been high (7 scale) for the past hour at least. plasma. late bd 7.7msec; br = +.001 EDA, 2pi is under 200kW, no increase with 2nd RF step. H-alpha does increase on 2nd step W=112kJ
Feb 10 1998 11:41:38:630AM	980210010	Steve Wolfe	Shot #10: repeat. fizzle. bd back at 6msec, Br=+.0005, bz looks a bit negative. Just wait it out.
Feb 10 1998 11:56:15:560AM	980210011	Steve Wolfe	Shot #11: no changes. plasma. looks like #9. small injection at .85, then 2pi drops to 150kW W=110kJ. Rneut=1.e13. Mo monitor died this shot. Won't be back for next shot according to JT Next shot, just repeat.
Feb 10 1998 12:04:01:880PM	980210012	Steve Wolfe	Shot #12: no changes. fizzle. bd at 6.3msec, slow current rise.
Feb 10 1998 12:11:35:520PM	980210013	Steve Wolfe	Shot #13: no changes.fizzle.
Feb 10 1998 12:23:04:350PM	980210014	Steve Wolfe	Shot #14: br from .0055 to .005; pre-puff from 14msec to 12msec plasma. faster current rise. Nice EDA h-mode; 2pi< 160kW. W=118kJ, Rneut= 1.2e13, slightly better than #11.
Feb 10 1998 12:30:48:130PM	980210015	Steve Wolfe	Shot #15: no changes. fizzle. bd back at 5.5msec, CII signal up to .003
Feb 10 1998 12:41:54:140PM	980210016	Steve Wolfe	Shot #16: no changes. plasma. w=110kJ, Rneut= 1.2e13. Not much change from 14.
Feb 10 1998 12:52:54:780PM	980210017	Steve Wolfe	Shot #17: no changes. plasma. Two in a row! W=116kJ, Rneut=1.2e13 Next shot, raise the power; try for 2.5MW on the second step.
Feb 10 1998 01:04:40:480PM	980210018	Steve Wolfe	Shot #18: raise the power; try for 2.5MW on the second step. plasma. got 2.6MW, density and h-alpha step increased. W> 130kJ, Rneut=2.3e13. Te>3keV H-alpha gets noiser in second step.
Feb 10 1998 01:16:28:590PM	980210019	Steve Wolfe	Shot #19: raise the power again; try for 3MW on the second step. plasma. Big injection at 1.11sec. Got the 3MW, with a trip at the injection. W=145kJ, Rneut=3e13. before the injection, then it loses it.
Feb 10 1998 01:29:48:540PM	980210020	Steve Wolfe	Shot #20: repeat, try to avoid the injection. smaller injection at 1.15. 150kJ, Rneut=3.5e13. Next shot, drop Nl4 to .7e20 (using segment 3).
Feb 10 1998 01:47:20:610PM	980210021	Steve Wolfe	Shot #21: drop Nl4 to .7e20 (using segment 3) (Wukitch's suggestion, instead of 1MA) plasma. 2big injections. W=150kJ, Rn=3.2e13, nl=0.8e20 (target)
Feb 10 1998 02:01:22:040PM	980210022	Steve Wolfe	Shot #22: No changes, see if the density comes down some more as the wall unloads. fizzle. late bd 9msec. Fields don't look terrible. Maybe we were just due.
Feb 10 1998 02:13:48:720PM	980210023	Steve Wolfe	Shot #23: No changes, see if the density comes down some more as the wall unloads. plasma. bd at 6.8msec, one transmitter drops out at .97sec, so only got 2.1MW in first step, 1.6MW in second. density a little lower, but gas is on longer.
Feb 10 1998 02:26:18:130PM	980210024	Steve Wolfe	Shot #24: Drop pg3 in segment 3 to 10V after .4sec. RF reducing power a bit. plasma, density down again, second RF step only 2.7MW. No injections. 2pi=200kW. 130kJ, 2e13 Next shot, 1MA.
Feb 10 1998 02:37:13:290PM	980210025	Steve Wolfe	Shot #25: Raise current to 1MA, same target density. plasma. 2.75MW into 1MA plasma. density keeps on ramping up, but it looks EDA 2pi ramps up to 600kW. Rneut =1.e14. W=213kJ. Best we've done this year.
Feb 10 1998 02:55:26:710PM	980210026	Steve Wolfe	Shot #26: Keep RF on flat at 2.7MW plasma, Rneut just under 1.e14, 213kJ near the end of the pulse. Very similar to #25. Quit while we're ahead, move on to the MP135 part of the run.
Feb 10 1998 03:10:33:160PM	980210027	Steve Wolfe	Shot #27: Start the MP135 part of the run: Use segment 2, 0.8MA limited discharge. Set RF tree noinclude in CMOD_MANAGE plasma, looks pretty good, lower x-point is a bit too close.
Feb 10 1998 03:20:35:790PM	980210028	Steve Wolfe	Shot #28: Add chops on Ip starting at .5sec. up to -700kA. five periods. Drop ZXL to -.025 from -.015. plasma. TV looked like the midplane marfe was bouncing. halpha is modulated, current gets modulated down to .725MA. Density is not modulated. RCUR and outer gap are.
Feb 10 1998 03:31:14:590PM	980210029	Steve Wolfe	Shot #29: INcrease modulation depth to 200kA, drop density to .8e20, drop pg3 to zero after .4sec dud, magnet resistance fault.
Feb 10 1998 03:46:41:870PM	980210030	Steve Wolfe	Shot #30: INcrease modulation depth to 200kA, drop density to .8e20, drop pg3 to zero after .4sec plasma disrupted at 0.92sec . Vertical position is bouncing and driving the chopper to the rail. also, a long hesitation in startup, almost didn't go at all.
Feb 10 1998 04:01:48:690PM	980210031	Steve Wolfe	Shot #31: modulation depth back to 100kA. Try again at nl4=.7e20 dud! Fields don't look that bad.
Feb 10 1998 04:24:10:010PM	980210033	Steve Wolfe	Shot #33: Drop the pg3 voltage to zero from .2sec on. plasma, density still at 1.0e20. Move on to higher density.
Feb 10 1998 04:40:15:300PM	980210034	Steve Wolfe	Shot #34: NL4 to 1.2e20; pg3 to 30V in seg2. previous shot had a late breakdown and a hesitation; maybe I should have tweaked the startup. fizzle. TF crowbarred late. late bd again.
Feb 10 1998 05:03:52:320PM	980210035	Steve Wolfe	Shot #35: br to .0045 from .005 NL4 to 1.2e20; pg3 to 30V in seg2. plasma, nl4 goes from 1.2 to 1.4e20. Looks good on the TV.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:04:23:310AM	Test	Ok	cycle test errors probably because cycle was put into standby to sync u
2	08:59:09:300AM	Test	Ok	OH test /Btop puff test OK
3	09:09:41:210AM	Test	Ok	no faults
4	09:19:28:680AM	Test	Ok	no faults/plasma
5	09:36:12:260AM	Test	Ok	no faults
6	09:45:26:420AM	Test	Ok	no faults
7	09:57:04:480AM	Test	Bad	ef3 blown fuse, scr to be checked
8	11:18:35:080AM	Test	Ok
9	11:26:08:330AM	Plasma	Ok	no faults/plasma
10	11:37:12:900AM	Plasma	Ok	no faults
11	11:48:04:700AM	Plasma	Ok	no faults/plasma
12	11:57:30:520AM	Plasma	Ok	no faults
13	12:07:45:190PM	Plasma	Ok	no faults
14	12:16:46:740PM	Plasma	Ok	no faults/plasma
15	12:27:10:720PM	Plasma	Ok	no faults
16	12:36:06:620PM	Plasma	Ok	no faults/plasma
17	12:47:01:950PM	Plasma	Ok	no faults/plasma
18	12:58:31:940PM	Plasma	Ok	no faults/plasma
19	01:10:03:890PM	Plasma	Ok	no faults/plasma
20	01:23:56:350PM	Plasma	Ok
21	01:37:46:640PM	Plasma	Ok
22	01:55:41:930PM	Plasma	Ok
23	02:06:33:490PM	Plasma	Ok
24	02:18:44:990PM	Plasma	Ok
25	02:29:55:280PM	Plasma	Ok
26	02:48:54:020PM	Plasma	Ok
27	03:00:51:480PM	Plasma	Ok
28	03:14:07:770PM	Plasma	Ok
29	03:28:52:590PM	Plasma	Bad	mag resist fault
30	03:39:41:360PM	Plasma	Ok
31	03:55:31:340PM	Plasma	Ok
32	04:07:20:530PM	Plasma	Ok
33	04:20:07:780PM	Plasma	Ok
34	04:32:20:770PM	Plasma	Ok	tf cbar after fizzle in inversion
35	04:58:56:770PM	Plasma	Ok