| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Steve Wolfe,Jerry Hughes |
| Physics operator(s): | Steve Wukitch |
| Engineering operator(s): | Bill Parkin,Roza Tesfaye,Ed Fitzgerald |
| Engineering Operator Run Comment |
| MP#716 ITER Demo discharges at 5.4T |
| Session Leader Plans |
| Entered: Aug 16 2012 12:42:46:967AM |
| Author: Jerry Hughes |
|
If time is made available for MP715 tomorrow, the shot plan will consist of: 1. Load from 1120810030. Load ICRF demand from 1120810030, and make the following changes: 0.5--0.7s: keep unchanged 0.7--0.8s: increase by 300kW 0.8--1.0s: keep unchanged 1.0--1.1s: decrease by 300kW 1.1--1.3s: keep unchanged 1.3--1.5s: increase by 300kW Disable NINJA. Enable Ar from B-side lower. Use a 70ms puff at 0.3s. Keep this constant throughout. Make any necessary adjustments to ECE to reproduce coverage from previous runs of this MP on 1120807 and 1120810. Run this shot and look for L-H transitions. 2. Adjust the Prf steps shot-to-shot in order to resolve the power threshold in each phase. 3. In the unlikely event that step 2 is completed, then change the order of current ramps to rule out time-sensitive behavior: Change the current demand so that: 0.5--0.7s: flat 1.1MA 0.7--0.8s: ramp from 1.1 to 0.8MA 0.8--1.0s: flat 0.8MA 1.0--1.1s: ramp from 0.8 to 1.1MA 1.1--1.3s: flat 1.1MA 1.3--1.5s: ramp from 1.1 to 0.8MA 1.5-- : ramp down as usual Adjust Prf steps to attempt to stay below Pth based on experience in 2. Then re-adjust to check Pth in each phase. |
| Entered: Aug 16 2012 08:27:25:097AM |
| Author: Steve Wolfe |
Session Leader plan for Thursday, Aug 16, 2012 MP#716 ITER Demo discharges at 5.4T SL: wolfe Overnight boronization required (standard prescription, He ECDC afterward) Required systems: ---------------- ICRF (all 4 transmitters) LH (700kW or max available power) N2 seeding (16psi in H-bottom plenum), enable B-div-horizontal output PG6 Argon (1psi in B-side Lower) Diagnostics: ------------ All standard profile diagnostics should be operational. Thomson scattering views should be arranged to cover the pedestal in the ITER shape (ref 1120807012). HIREX_SR data for Ti and rotation is desired, provided it does not require too much argon. Neutron rate measurements are required. Core bolometry (Prad_Main) is required. Divertor bolometry is desired. Nitrogen monitoring as on 1120807 is desired. Divertor heat flux measurements, including IR camera, are desired. Fluctuation diagnostics are desired and encouraged. Non-perturbative NINJA puffing for GPI will be allowed. LHRF-related diagnostics should be enabled (no need for HXR though) We'll be doing N2 puffing, so the B CXRS systems will presumably not be useful. Run begins at 09:00 and ends at 14:00 (assuming no delays) This MP will end by 13:00 (or earlier), to be followed by one hour (or more) of MP#715, assuming Jerry wants it. The goal of this run is to extend the C-Mod dataset of ITER-like discharges employing EDA H-modes to 5.4T, 1.3MA, kappa=1.75, q95~3.2. The target performance, as defined in IOS-1.1, is to achieve beta_N>1.7, which corresponds to Wmhd>300kJ; this would significantly exceed the record stored energy for C-Mod, and implies H98~1. It's good to have goals. This run will build on the experience from MP645a on 1120807, and try to improve the beta, primarily by increasing the confinement. The best results from 1120807 had H98~0.7 and beta_N~1.2. Steady EDA H-modes were obtained with nebar~5.2e20, n/nG~0.6. Pnet/Pth was below 1, which may account for the low H factor. There is essentially no headroom on the RF power, which ran up to 4.5MW, but it may be possible to increase Pnet somewhat by reducing the core radiation further. We may also be able to reduce the H-mode density and perhaps increase the confinement by adding LH power, as in Matt's MP701 experiment on 1120725, which found surprisingly beneficial effects from 650kW of LH at quite high density. We will start from shot#1120807018 (target nl04=1.6e20, N2 seeding at 40%) but extend the flattop from 1.2 to 1.5sec, keeping the RF power flat at 4.5MW (or maximum) to EOF. The N2 seeding puff will also be extended. The idea is to see if the core radiation will decrease further, as observed in other seeded EDA H-modes. It may be useful to decrease the outer gap to improve the RF loading to keep J from faulting near its voltage limit. It may also be useful to reduce the initial RF power to 2MW to avoid ELM-free behavior in the early H-mode. We will then add LH power in the 600 to 700kW range, and see if the magic observed on 1120725 translates to the even higher densities of the ITER-like case. There are a limited number of knobs available, so if these are not successful we may be ready to bail out early. Jerry has at least another hour allocated to MP#715, and we could add any time saved from MP#716 to that. Proposed shot sequence (total 15 shots): 1) Boronization recovery and shot setup [3-6 shots] Load from 1120807018 (both seg1 and 2), extend flattop (including Ip and shape programming) from 1.2 to 1.5sec. Extend TF to 1.7 sec. Enable B-div (N2) as in the reference shot, with puff extended to 1.3sec. Probably want some changes to early PCS programming to try to avoid the vertical thrashes between 0.8 and .14 sec encountered on 1120807 (tbd). RF programmed to start at 0.6sec, 2MW, and ramp to 3MW at 1.2sec, then flat at 3MW to EOF, then drop to 1MW in rampdown. a) Begin boronization recovery, increasing the max RF power to 4.5MW. Adjust outer gap if necessary to improve RF loading. b) Once EDA H-mode is established, inject minimum amount of argon (B-side Lower) consistent with usable HIREX_SR signal; start with 35msec (@1psi). If it seems to adversely affect the EDA then turn it off. c) Once H-mode is obtained, begin injecting LH between .9 and 1.2 sec (or at some time during the EDA). If necessary, adjust outer gap to improve LH coupling, hopefully without compromising ICRF. Raise power to ~700kW, if possible. 2a) If LH seems to be effective, either in improving H or decreasing pedestal density, extend pulse length to cover more of the flattop. If possible, increase LH power. Tune for most neuts. [2-5 shots] 2b) If LH won't couple or has no effect, then turn it off. Try tailoring RF power and seeding waveforms to maximize performance in quasi-steady EDA. [2-5 shots] 3) Density scan: a) If previous steps have been successful in increasing Wmhd into the target range, then increase the target density to probe the effect of increasing n/nG. Based on the results of MP#698, we expect degradation of the H-factor, and the RF may be adversely affected by increased fueling, so there is probably not a lot of room for a scan in this direction [2-3 shots] b) If we haven't been successful in step 2, then decrease the target density and see what can be done in more transient, ELM-free conditions. Target nl04=1.2e20 and 1.0e20; try increasing the N2 seeding to avoid overheating the divertor and excess Mo. [3-5 shots] 4) If we haven't turned off the argon, and the results look sufficiently interesting, then run a locked mode shot so HIREX_SR can calibrate its rotation measurements. |
| Physics Operators Plans |
| Entered: Aug 16 2012 06:32:54:890AM |
| Author: Steve Wukitch |
| -----------------
Engineering Setup ----------------- Run begins at 09:00 and ends at 17:00 MP#716 ITER Demo discharges at 5.4T SL: wolfe PO: Wukitch First Half of Run ================= Power systems as on: 1120807018 Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid Enabled Gas setup: Require N2 bottle connected Pump and purge all plenums (except B-side Upper) Fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill H-bot with 16psi of N2, Hybrid DISABLED (PG6) fill NINJA with 10 psi D2 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): yes Overnight ECDC (yes/no): Yes ICRF(yes/no): Yes LH(yes/no): no Cryopump (yes/no): no DNB (yes/no): no Vessel temperature: 35/35/35 -------------------------------------- Boronization Parameters (if requested) -------------------------------------- rmin/rdwell/rmax: 44/75/90 cm tdwell/tsweep: 60/120 s EF4 current: 0 A ---------------------------- Post boronization ECDC ---------------------------- 1st Gas Setup: Gas: He sweep: 45/103/45 cm scan: 20/120 s Pressure: 5e-5 Torr Duration: 2Hrs ---------------------------- PO Plan ---------------------------- Made changes to avoid thrash at segment switch (0.08 s) EF2U was copied from EF2L ZXL was zeroed before 0.5 s We did not modify RCUR gains which also have discontinuity at the segment switch Increased the flat top to 1.5 s from 1.2 s Ip turns over at 1.5 s nl_04 extended to 1.5 s RCUR extended to 1.5 s follow SL plan |
| Session Leader Summaries |
| Entered: Aug 16 2012 02:05:25:710PM |
| Author: Steve Wolfe |
Session Leader summary for 16-aug-2012, 9:00-13:00 MP#716: ITER demo discharges at 5.4T SL: wolfe PO: wukitch EO: Parkin, Tefaye We gave it the old Institure try, but we were unsuccessful in increasing the beta_N of the 1.3MA, nebar~5e20/m^3 H-mode discharge above 220kJ, betaN~1.15, which had already been achieved on 1120807. The LH was unsuccessful operating above 200kW of net power, and any effect on the discharge was hard to see. ICRF coupled up to 4MW with only a few faults. The H-modes for the first part of the day were much more ELM-free than expected, based on the results of 1120807. After shot#9 we turned on the H-div puff, at the same ~10Tl/sec as B-div, and we got steadier radiated power, and longer EDA-ish H-modes with small ELMs, but low pedestals and somewhat poorer H-factor and beta. These shots also used delayed ICRF (to .7sec rathere than .6), so it's not completely clear what killed the ELM-free behavior, but I think it was the incresed N2. Attempts to reduce the total N2 puff on shots 14-16 were frustrated by fizzles. The best H-mode shots in terms of steady Prad and beta were 10,11 and 13. These shots also had small ELMs, and very quasi QCM. Jerry reports that the pedestal density was high, nearly up to the central density, which has previously been flagged as not being conducive to good H-factors. H98 was about 0.6, i.e. L-modish, on these shots, somewhat higher on the ELM-freeish cases earlier in the day, e.g. H98 > 0.7 on shot#4 and 5, but still not nearly good enough. JT got IR camera data on the high N2 shots, which indicated very low power to the outboard divertor, which is consistent with the display_energy plots. I need a probe person to look at the probe data, but it looked to me like the outer divertor detached on these, which is different from the results with half the total N2 on 1120807. Core N2 signals were about higher than shots earlier in the day, and roughly flat during the H-mode. Probably the core radiation was dominated by low-z, since the Mo brightness went way down. There may be some additional data for the seeding study in today's shots; nothing really to contribute to IOS-1.1. |
| Entered: Aug 16 2012 04:50:42:663PM |
| Author: Jerry Hughes |
| MP715 wrap-up. (PM run)
We had an apparently successful ~2 hours devoted to finishing MP715. This comprised shots 17--24. Seven of these were useful plasmas, intended to be similar to discharges developed for run 1120810. Shots 17--20, 22 and 23 had Ip waggles during flattop, and varying steps of ICRF power. Short-lived H-modes were obtained in several cases, and we were able to bracket the power threshold with d|Ip|/dt = +/-3MA/s, and also with a half-speed ramp-up. Shot 24 was a constant Ip=0.93 flattop with RF power steps to establish the control power threshold. The L-mode density in all cases ranged from about 1.9 to 2.6 x 10^20 m-3. With non-ramping current, 1.1MW of ICRF was required to initiate H-mode. When ramping |Ip| down, only about 0.7MW of ICRF was required. This reduction is consistent with initial results obtained for this MP on 1120810. When ramping |Ip| up, we needed closer to to 2.0MW of ICRF power. This is all on top of ~1MW of Ohmic power, give or take. I want to check my ohmic power calculation and include the Wdot before saying anything about the total power at L-H in all these cases. |
| Physics Operator Summaries |
| Entered: Aug 16 2012 03:09:24:570PM |
| Author: Steve Wukitch |
| We had concerns about instabilities at segment 1 to segment 2 switch
but we did not have it today. We made changes prior to operation to avoid discontinuities. In particular, EF2U was copied from EF2L and the chopper was zeroed at 0.05 s. We had more fizzles than we would like and to control the moly radiation we increased N2 seeding. The second part of the run went smoothly and was based on 1120810 with largely RF waveform modifications. Summary plasmas 17 fizzle 7 disrupted 3 (>0.7 MA) --------------------- attempts 24 |
| Session Leader Comments | |||
| Aug 16 2012 08:45:04:753AM | 1120816001 | Steve Wolfe | There was a snafu on the cooling water temperature last night, and a number of HV systems have water condensation issues this morning. RF and power systems engineers are trying to get things dried out. Shot#1: First plasma attempt, aiming for 1.3MA to 1.5sec eof, target nl04=1.6e20; may have first shot after boronization wall outgassing issues. RF should fire 2-> 3MW, starting at 0.6sec. N2 seeding requested from 0.55sec to 1.3sec (40% on B-DIV) No LH on first shot. |
| Aug 16 2012 09:17:49:387AM | 1120816001 | Steve Wolfe | There was a snafu on the cooling water temperature last night, and a number of HV systems have water condensation issues this morning. RF and power systems engineers are trying to get things dried out. Shot#1: First plasma attempt, aiming for 1.3MA to 1.5sec eof, target nl04=1.6e20; may have first shot after boronization wall outgassing issues. RF should fire 2-> 3MW, starting at 0.6sec. N2 seeding requested from 0.55sec to 1.3sec (40% on B-DIV) No LH on first shot. Result: plasma disrupted 1.6 sec, with H-modes Going vertically unstable in late flattop. RF on and off. Wmhd maxes out at 160kJ Need to look at the vertical instability ECE turbo tripped on the disruption, engineer's workstation crashed. |
| Aug 16 2012 09:41:45:450AM | 1120816002 | Steve Wolfe | Shot#2: tweaked the late flattop and rampdown a little, hopefully RF will stay on better. Result: presure was 6e-6 in Check? fizzle. pressure was .07mTorr at breakdown. Probably a gatevalve opened at high pressure in init or check. Next: repeat, after cell access for JT, TCI, etc |
| Aug 16 2012 09:57:52:017AM | 1120816003 | Steve Wolfe | Shot#3: repeat, after cell access for JT, TCI, etc plasma to 1.8sec lots of h-modes again, lots of rf faults. Max wmhd=187kj, very transient Early H-modes look pretty elm-free, Repeat, try for better RF hold off on lh for now. |
| Aug 16 2012 10:13:45:220AM | 1120816004 | Steve Wolfe | Shot#4:Repeat, try for better RF hold off on lh for now. plasma to 1.8sec, despite a high pressure in check from VUV (McPherson) three H-modes, all pretty ELM-free? Target density is 1.65e20 at the first one, but radiated power is screaming up. Wmhd reaches 210kJ, betaN~1.18 RF better, trips on H-L I think. Next: Request LH from 0.9 to 1.2sec, raise target nl04 to 1.7e20 raise icrf flattop power to 4MW Increase pg6 from 40 to 50%, only got 6.6T-l in .75sec, try a little more |
| Aug 16 2012 10:28:38:463AM | 1120816005 | Steve Wolfe | Shot#5 :Request LH from 0.9 to 1.2sec, raise target nl04 to 1.7e20 raise icrf flattop power to 4MW Increase pg6 to 50% VUV gate valve off, I hope. plasma to 1.7, too many h-modes J-port drops out in the middle of the shot LH faulting repeatedly. Wmhd transiently to 207 in first h-mode. H98~.7 Move LH earlier, .75-1.0sec RF still tuning. Move start of pg6 to 0.5sec |
| Aug 16 2012 10:46:21:737AM | 1120816006 | Steve Wolfe | Shot#6 :Move LH earlier, .75-1.0sec RF still tuning. Move start of pg6 to 0.5sec Disrupted at 1.35sec, one H-mode until it dies, or maybe it just restrike quickly? nebar~6e20, wmhd~210kJ Some rf faulting, but not too bad, max rf~4MW. Prad still high, looks like Mo? LH a little better, continuing to try. Next: try again |
| Aug 16 2012 10:59:23:297AM | 1120816007 | Steve Wolfe | Shot#7 : try again plasma full length, lots of transitions, lots of faulting on ICRF, lost D at 1.2sec, faulting on E and J. LH is looking a little better at 200kW, no obvious effect. Next: Enable H-div puff same as B-div, should almost double the N2, which would be too much based on last week, but it's not doing much now. |
| Aug 16 2012 11:07:04:220AM | 1120816008 | Steve Wolfe | Shot#8: Enable H-div puff same as B-div, should almost double the N2, which would be too much based on last week, but it's not doing much now. fizzle, looks like a flake at .03 sec or so, moving outside. Cell access to fix ratiomatic. Also engineers will check fuses in OH1 Next: repeat |
| Aug 16 2012 11:34:01:643AM | 1120816009 | Steve Wolfe | Shot#9: Enable H-div puff same as B-div, should almost double the N2, which would be too much based on last week, but it's not doing much now. plasma full length. Steady Prad from 1.0 to 1.5sec Steadier H-mode at ~200kJ, D faults out after 1.2sec or so. LH stays on pretty well at 200kW, but it's only there before 1sec ECE is right on the edge of cut-off. N light is up, Mo seems to be down, except for a spike around 1.1sec If I'm interpreting the probes correctly, we may be detaching the outer div. Add 2mm to outer gap for LH Delay ICRF to .7, delay LH to .85 and run to 1.3sec |
| Aug 16 2012 11:38:02:267AM | 1120816009 | Steve Wolfe | Shot#9: Enable H-div puff same as B-div, should almost double the N2, which would be too much based on last week, but it's not doing much now. plasma full length. Steady Prad from 1.0 to 1.5sec Steadier H-mode at ~200kJ, D faults out after 1.2sec or so. LH stays on pretty well at 200kW, but it's only there before 1sec ECE is right on the edge of cut-off. N light is up, Mo seems to be down, except for a spike around 1.1sec If I'm interpreting the probes correctly, we may be detaching the outer div. Ratiomatic is back on, but calibration looks high by at least a factor of two Add 2mm to outer gap for LH Delay ICRF to .7, delay LH to .85 and run to 1.3sec Ask JT to turn on IR camera, it's been off! |
| Aug 16 2012 11:56:13:747AM | 1120816010 | Steve Wolfe | Shot#10: Add 2mm to outer gap for LH Delay ICRF to .7, delay LH to .85 and run to 1.3sec Ask JT to turn on IR camera, it's been off! plasma to 1.8sec, steadier Prad around 2MW, RF looks good, LH timing was not changed, Wmhd is down to 190kJ, nebar~5.4e20. JT reports very low power on outer divertor, consistent with TC's Next: get ICRF to 4MW by 1.0sec, LH extended to .85 to 1.3sec, step power up to 450 for second half |
| Aug 16 2012 12:06:06:343PM | 1120816011 | Steve Wolfe | Shot#10: get ICRF to 4MW by 1.0sec, LH extended to .85 to 1.3sec, step power up to 450 for second half Similar shot, a few more rf faults, prad pretty steady LH ok at 240kW, faults at 450; not looking good for increasing that. wmhd peaks at 195kJ, then falls.Elongation up a bit D is not happy at the end of flattop. LH will try more smaller steps. |
| Aug 16 2012 12:13:10:090PM | 1120816012 | Steve Wolfe | Shot#12:LH will try more smaller steps. Fizzle, injection at .035sec Next: Try again |
| Aug 16 2012 12:41:22:080PM | 1120816013 | Steve Wolfe | Shot#13:LH will try more smaller steps. Fizzle, injection at .035sec Disrupts in early rampdown, long steady-ish H-mode, still decaying stored energy and neutrons. LH is no better, still nothing above 220kW. There may be a problem with nl04 analyzed data on this shot, the feedback signal shows target at 1.65e20, analyzed signal says over 2. Move plasma over in by 2mm, trying to improve LH Decrease N2 puffs to 35%. |
| Aug 16 2012 12:41:52:333PM | 1120816014 | Steve Wolfe | Shot#14:Move plasma over in by 2mm, trying to improve LH Decrease N2 puffs to 35%. fizzle, hits outside, so dropping the fill would have made it worse. Try again. |
| Aug 16 2012 12:57:07:987PM | 1120816015 | Steve Wolfe | Shot#15:Move plasma in by 2mm from #13, trying to improve LH Decrease N2 puffs to 35%. Another fizzle, One more try, then turn it over to Jerry, unless something really exciting happens. |
| Aug 16 2012 01:03:16:943PM | 1120816016 | Steve Wolfe | Shot#15:Move plasma in by 2mm from #13, trying to improve LH Decrease N2 puffs to 35%. One more try, then turn it over to Jerry. Fizzle, that's all for this one. |
| Aug 16 2012 01:27:06:707PM | 1120816017 | Jerry Hughes | Time to squeeze some more juice out of MP715.
Shot 17 Try a reload of 1120810030, with some mods to the RF power program. Result: Good Ip trace. 900kW in the flat Ip periods. 2nd one has some faults. 1200kW in the fast ramp-up phase with some faults. 560kW in the ramp-down phase clean. 1200kW in the slow ramp-up phase clean. No L-H in any case. Next try to get cleaner RF, plus more demand in some phases. |
| Aug 16 2012 01:47:19:457PM | 1120816018 | Jerry Hughes | Shot 18:
Result 1st flat Ip phase: no L-H with 900kW clean fast ramp up: no L-H with 1200kW (fault) 2nd flat Ip phase: no L-H with 900kW clean fast ramp down: L-H at 1.057s, with Prf=750kW, clean 3rd flat Ip phase: no L-H with 900kW (faulting) -- but we are limited because of an uncorrected radial excursion. slow Ip ramp-up: no L-H with 1500kW (one fault, partly limited) This would seem to bracket the power needed in ramp-down phase. Next: adjust power levels further to try find L-H in other phases. |
| Aug 16 2012 01:55:53:377PM | 1120816019 | Jerry Hughes | Shot 19:
Result 1st flat Ip phase: no L-H with 900kW clean fast ramp up: no L-H with 1700kW (fault late) 2nd flat Ip phase: no L-H with 1050kW clean fast ramp down: no L-H, with Prf=650kW, clean 3rd flat Ip phase: no L-H with 900kW (faulting) slow Ip ramp-up: no L-H with 1650kW (some faulting) Need to be more aggressive with power, given the time available |
| Aug 16 2012 02:05:27:493PM | 1120816020 | Jerry Hughes | Shot 20:
Result: 1st flat Ip phase: no L-H with 1200kW (fault) fast ramp up: no L-H (I think) with 1950kW (faults, with a skrinking RGAP) 2nd flat Ip phase: no L-H with 1370kW clean fast ramp down: L-H at 1.03s, with 950kW, clean 3rd flat Ip phase: no L-H with max 1170kW (faulting) slow Ip ramp-up: no L-H with 1950kW (some faulting) Next: Raise power 400kW in the ramp-up phases and 300kW in the flat Ip phases. Drop power 100kW in the ramp-down phase. |
| Aug 16 2012 02:09:20:880PM | 1120816021 | Jerry Hughes | Shot 21
Fizzle |
| Aug 16 2012 02:35:56:680PM | 1120816022 | Jerry Hughes | Shot 22
Nice shot. 3 H-modes. Result: Good RGAP, good density trace 1st flat Ip phase: no L-H with 1200kW (fault) fast ramp up: L-H at 0.724s with 2000kW, clean (but just barely into the ramp-up) 2nd flat Ip phase: no L-H with 1430kW clean (recovering from H-L transition) fast ramp down: L-H at 1.04s, with 800kW, clean 3rd flat Ip phase: no L-H with max 1200kW clean (recovering from H-L transition) slow Ip ramp-up: L-H at 1.46s with 1950kW clean Next: Adjust power some more to clean up result |
| Aug 16 2012 02:49:37:203PM | 1120816023 | Jerry Hughes | Shot 23
Good shot. Clear transition in the fast ramp-up phase. 1st flat Ip phase: no L-H with 1000kW, clean fast ramp up: L-H at 0.76s with 2080kW, mostly clean 2nd flat Ip phase: no L-H with 1430kW clean (recovering from H-L transition) fast ramp down: L-H at 1.05s, with 650kW clean 3rd flat Ip phase: no L-H with max 1400kW, mostly clean (recovering from H-L transition) slow Ip ramp-up: no L-H with 1760kW clean Still need a clear Pth result with constant Ip. |
| Aug 16 2012 03:08:14:197PM | 1120816024 | Jerry Hughes | Shot 24
Constant Ip plasma, with RF steps. Perfect. L-H at 0.85s with 1120kW ICRF. That nails it. We have bracketed the threshold power in the flat Ip case as well as in the Ip ramps. |
| Physics Operator Comments | |||
| Aug 16 2012 09:02:35:120AM | 1120816001 | Steve Wukitch | prep for 001
Seg2: Move ramp in on RCUR to start at 1.5sec, instead of 1.35sec (your logbook entry says you did this, but it doesn't seem to have happened) Move ramp in on CLEARIN to start at 1.5sec, instead of 1.2sec On ALL_V's screen: extend TF flattop to 1.7sec (from 1.5sec) for ICRF heating in rampdown. extend B-divertor (PulseGas6) pulse to 1.3sec (from 1.0sec) Seg1: On ALL_V's screen: Change Chopper waveform to get down to 0.0 at .05sec (was at .06) We will want B-divertor gas enabled for first shot. |
| Aug 16 2012 09:34:10:447AM | 1120816001 | Steve Wukitch | 001 demand: nl04~1.6, BT~5.4, Ip~1.3
result: plasma disruption in rampdown - vertically unstable next: extend ZXU into rampdown (1.65 s) modify ZXL during rampdown Load at 16-Aug-2012 09:33:18.00 |
| Aug 16 2012 09:42:04:937AM | 1120816002 | Steve Wukitch | 002 demand: nl04~1.6, BT~5.4, Ip~1.3
result: fizzle - pressure spike observed in check checked vacuum behind diagnostics - look okay next: return prepuff to 20 ms Load at 16-Aug-2012 09:40:26.00 |
| Aug 16 2012 10:13:45:397AM | 1120816003 | Steve Wukitch | 003 demand: nl04~1.6, BT~5.4, Ip~1.3
result: plasma - disrupted about ~0.5 MA multiple H-modes next: slow decrease in RCUR during rampdown Load at 16-Aug-2012 09:59:07.00 |
| Aug 16 2012 10:14:40:783AM | 1120816004 | Steve Wukitch | 004 demand: nl04~1.6, BT~5.4, Ip~1.3
result: plasma despite VUV/HIREX SR - McPherson opening and raising the Torus pressure H-modes are ELM free next: raise target density to 1.7, raise demand at 0.3 s to 1.4 raise RF power to 4 MW start LH injection slow ZXU ramp in rampdown Load at 16-Aug-2012 10:13:22.00 |
| Aug 16 2012 10:59:31:270AM | 1120816007 | Steve Wukitch | 007 demand: nl04~1.7, BT~5.4, Ip~1.3
result: plasma - further into rampdown LH ran better ICRF was ratty next: prepuff back to 20 ms H-div enabled Load at 16-Aug-2012 10:58:04.00 |
| Aug 16 2012 11:12:03:880AM | 1120816008 | Steve Wukitch | 008 demand: nl04~1.7, BT~5.4, Ip~1.3
result: strong fizzle - ill time crudflake at 0.03 s next: repeat cell access to replace filament - f-side ratiomatic |
| Aug 16 2012 11:51:49:003AM | 1120816010 | Steve Wukitch | 010 demand: nl04~1.7, BT~5.4, Ip~1.3
result: plasma best RF of the day thus far next: repeat with adjusted LH and ICRF timing/power level |
| Aug 16 2012 12:06:24:873PM | 1120816011 | Steve Wukitch | 011 demand: nl04~1.7, BT~5.4, Ip~1.3
result: plasma next: repeat with different LH |
| Aug 16 2012 12:18:02:857PM | 1120816012 | Steve Wukitch | 012 demand: nl04~1.7, BT~5.4, Ip~1.3
result: fizzle - ill timed crudflake at 0.03 next: make EF4 more positive by 10 A (-1310 to -1300) work on rampdown - limit plasma more quickly by reducing CLEARIN at 1.8 s Load at 16-Aug-2012 12:17:35.00 |
| Aug 16 2012 12:44:27:760PM | 1120816013 | Steve Wukitch | 013 demand: nl04~1.7, BT~5.4, Ip~1.3
result: plasma - disruption in rampdown next: move whole plasma away for LH reduce RCUR by 2 mm reduce CLEARIN by 2 mm Load at 16-Aug-2012 12:33:15.00 |
| Aug 16 2012 12:49:32:550PM | 1120816014 | Steve Wukitch | 014 demand: nl04~1.7, BT~5.4, Ip~1.3
result: fizzle - hits on outboard next: raise prepuff 2 ms to 22 ms PG6 and PG7 at 35V Load at 16-Aug-2012 12:47:57.00 |
| Aug 16 2012 12:55:30:243PM | 1120816015 | Steve Wukitch | 015 demand: nl04~1.7, BT~5.4, Ip~1.3
result: operator error - did not increase prepuff as I intended next: increase prepuff 3 ms Load at 16-Aug-2012 12:54:10.00 |
| Aug 16 2012 01:04:33:177PM | 1120816016 | Steve Wukitch | fizzle |
| Aug 16 2012 01:05:00:007PM | 1120816016 | Steve Wukitch | Power systems same as 1120810030.
|
| Aug 16 2012 01:12:39:867PM | 1120816016 | Steve Wukitch | next: loaded from 1120810030 both seg1 and seg2
only changes are RF waveforms Load at 16-Aug-2012 13:11:44.00 |
| Aug 16 2012 01:23:22:530PM | 1120816017 | Steve Wukitch | 017 demand: Ip wags around 0.8, nl04~1.5, BT~5.45
result: plasma next: adjust RCUR to avoid outboard contact at 1.2 s Load at 16-Aug-2012 13:20:28.00 |
| Aug 16 2012 01:38:09:160PM | 1120816018 | Steve Wukitch | 018 demand: Ip wags around 0.8, nl04~1.5, BT~5.45
result: plasma right gap is too small from 1.1-1.4 s next: increase right gap - RCUR smaller by 0.01 increase nl_04 demand at 0.24 s to 1.2 Load at 16-Aug-2012 13:37:09.00 |
| Aug 16 2012 01:51:43:020PM | 1120816019 | Steve Wukitch | 019 demand: Ip wags around 0.8, nl04~1.5, BT~5.45
result: plasma right gap is better next: tweek RCUR smaller by 0.002 Load at 16-Aug-2012 13:46:55.00 |
| Aug 16 2012 02:01:19:360PM | 1120816019 | Steve Wukitch | 020 demand: Ip wags around 0.8, nl04~1.5, BT~5.45
result: plasma next: tweek RCUR smaller by 0.006 at 0.8 Load at 16-Aug-2012 14:00:53.00 |
| Aug 16 2012 02:17:34:900PM | 1120816021 | Steve Wukitch | fizzle
next: EF4 10A more positive (-1300 from -1310) |
| Aug 16 2012 02:28:11:013PM | 1120816022 | Steve Wukitch | 022 demand: Ip wags around 0.8, nl04~1.5, BT~5.45
result: plasma next: repeat with different RF waveforms |
| Aug 16 2012 02:43:17:677PM | 1120816023 | Steve Wukitch | 023 demand: Ip wags around 0.8, nl04~1.5, BT~5.45
result: plasma - SL is happy next: repeat with flat Ip at 0.93 MA Load at 16-Aug-2012 14:39:54.00 |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:03:08:327AM | Plasma | Ok | |
| 2 | 09:34:11:347AM | Plasma | Ok | |
| 3 | 09:46:44:777AM | Plasma | Ok | |
| 4 | 10:00:21:087AM | Plasma | Ok | |
| 5 | 10:15:42:937AM | Plasma | Ok | |
| 6 | 10:30:28:520AM | Plasma | Ok | |
| 7 | 10:46:37:557AM | Plasma | Ok | |
| 8 | 11:00:31:127AM | Plasma | Ok | |
| 9 | 11:20:18:020AM | Plasma | Ok | |
| 10 | 11:40:38:530AM | Plasma | Ok | |
| 11 | 11:53:35:817AM | Plasma | Ok | |
| 12 | 12:08:19:313PM | Plasma | Ok | |
| 13 | 12:20:41:900PM | Plasma | Ok | |
| 14 | 12:34:17:413PM | Plasma | Ok | |
| 15 | 12:48:49:457PM | Plasma | Ok | |
| 16 | 01:01:15:393PM | Plasma | Ok | |
| 17 | 01:13:43:540PM | Plasma | Ok | |
| 18 | 01:26:25:040PM | Plasma | Ok | |
| 19 | 01:39:10:410PM | Plasma | Ok | |
| 20 | 01:52:48:207PM | Plasma | Ok | |
| 21 | 02:06:27:993PM | Plasma | Ok | |
| 22 | 02:19:27:717PM | Plasma | Ok | |
| 23 | 02:33:30:617PM | Plasma | Ok | |
| 24 | 02:48:10:537PM | Plasma | Ok | |
| System Availability | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Aug 16 2012 09:02:50:663AM | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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