| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Brian Labombard |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Gary Dekow |
| Engineering Operator Run Comment |
| MP#393 Magnetic fluctuations; SL:LaBombard; PO:Wolfe; EO:Dekow/Parkin |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:04:867PM |
| Author: Brian Labombard |
| Run Summary for 1040414 MP#393 "Magnetic fluctuations associated with edge plasma turbulence" Physics Operator: S. Wolfe Session Leader: B. LaBombard ______________________________________________________________________________ Purpose: The purpose is to characterize broad-band magnetic fluctuations associated with plasma turbulence in the vicinity of the magnetic separatrix. We will use the two-coil magnetic probe head installed on the A-port drive (ASP) to record poloidal magnetic field fluctuations (frequency and k-poloidal resolved) as a function of depth in the scrape-off layer. We are specifically interested in looking for changes in the character of magnetic fluctuations in ohmic L-mode as the edge plasma collisionality is changed. Plan: The key diagnostics which must be operational for this study are: A-port scanning probe (with double magnetic probe head) and F-port scanning probe. Start with a reload of shot#1040326019 which ran as a lower single-null, Ip = 0.8 MA, Bt = 5.4 tesla discharge with N04 = 0.86e20. Set ASP rest position to +14mm, FSP to -4 mm and scanning at 0.6, 0.8, 1.0 seconds. Shot#1,2 NL04 = 0.9 set up probe targets Begin density scan with two shots at each density. Alternate between A-port probe in scanning- and fixed-location modes Shot#4-14: NL04 = 0.9, 0.7, 0.5, 1.1, 1.3, 1.5 Allow for some repeated shots. If time allows, we may want to run a couple of shots in upper null topology to see if the poloidal phase velocities of the magnetic perturbations track with changes in edge plasma toroidal rotation. ______________________________________________________________________________ Result: This was a very productive run. We got an excellent density scan from NL04 = 0.3e20 to NL04 = 1.7e20 in lower-null discharges (Ip = 0.8MA, Bt = 5.4 tesla). We started off trying to alternate between having the ASP (magnetic probe) in a scanning and dwell (fixed-location) mode. But it became apparent that the probe was spewing in some gas (plus crud) in dwell mode. Also, the magnetic signals were weak in dwell mode. So we kept the probe scanning on the rest of the shots and did a fine density scan instead (steps of approx NL04 = 0.1e20). The magnetic probe signals were very clean and we were able to look at frequency and wavenumber resolved fluctuation spectra during the run. Some systematic differences were seen as a function of density and depth into the SOL. As a bonus, we were also able to take data in upper single-null discharges (shots 23-29). The magnetic data clearly showed a reduced poloidal phase velocity (i.e., not as strong in the electron diamagnetic direction) in these discharges compared to similar ones in lower single null. Perhaps the difference is related to a reduced pressure gradient near the separatrix which has been noted previously in probe profile data. This run completed all goals in MP#393. ______________________________________________________________________________ Shot log: 01- SNL, NL04=0.98, ASP(+15), FSP(-4), ISP, data ok 02- no TF 03- SNL, NL04=1.14, ASP(+13,dwell scan trig=.8), FSP(-3), ISP 04- early disruption 05- early disruption 06- SNL, NL04=0.9, ASP(+15), FSP(-3), ISP 07- SNL, NL04=0.9, ASP(+15), FSP(+1), ISP - excellent data 08- SNL, NL04=0.77, ASP(+15), FSP(+1), ISP - nice data 09- SNL, NL04=0.72, ASP(+14), FSP(-1), ISP - nice data 10- SNL, NL04=0.63, ASP(+14), FSP(-1), ISP 11- SNL, NL04=0.5, ASP(+12), FSP(-3), ISP 12- SNL, NL04=0.4, ASP(+12), FSP(-2), ISP 13- SNL, NL04=0.3, ASP(+12), FSP(-2), ISP 14- SNL, NL04=0.95, ASP(+12), FSP(-2), ISP 15- no power shot 16- SNL, NL04=1.15 to 1.2, ASP(+12), FSP(-2), ISP 17- SNL, NL04=1.1, ASP(+12), FSP(0), ISP => disrupts right after 1st scan 18- SNL, NL04=1.2 to 1.3, ASP(+11), FSP(-2) 19- SNL, NL04=1.3, 1.5, 1.6, ASP(+11), FSP(-1) 20- SNL, NL04=1.4, 1.5, 1.65, ASP(+12), FSP(0) 21- no power shot 22- SNL, NL04=1.4, 1.5, 1.65, ASP(+12), FSP(+2) 23- SNU, NL04=0.9 ASP(+6.5), FSP(+8.5) 24- SNU, NL04=1.1 ASP(+8.5), FSP(+9.5) 25- SNU, NL04=0.7 ASP(+8.5), FSP(+9.5) 26- SNU, NL04=0.5 ASP(+8.5), FSP(+9.5) 27- early disruption 28- early disruption 29- SNU, NL04=0.6, 0.54, 0.48 ASP(+8.5), FSP(+9.5) |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:49:863PM |
| Author: Steve Wolfe |
| Physics Operator Summary for 1040414 MP#393 "Magnetic fluctuations associated with edge plasma turbulence" SL: LaBombard followed by (time permitting) MP#386 "locked mode thresholds" SL: Hutchinson PO: Wolfe EO: Dekow,Byford ECDC overnight (D2) Run begins at 09:00 and ends at 17:00. Power systems the same as 1040326019 A-coils should be configured as on 1040331001 (+Dtop -Dbot -Jtop +Jbot), 3kA, 600V, enabled. Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) leave B-side upper with 15 psi He3 Hybrid disabled (not connected) fill C-side with 30 psi D2 Hybrid enabled (PG3) fill J-side with 30 psi D2 Hybrid disabled (PG2) Disable NINJA Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB ------------------------------------------------------------------------------- RF Setup: RF in RunOn by 9:00AM so Wukie can run some test piggyback shots for VTang ( a late addition to the plan). ------------------------------------------------------------------------------- Run Plan for MP#393: The purpose is to characterize broad-band magnetic fluctuations associated with plasma turbulence in the vicinity of the magnetic separatrix. We will use the two-coil magnetic probe head installed on the A-port drive (ASP) to record poloidal magnetic field fluctuations (frequency and k-poloidal resolved) as a function of depth in the scrape-off layer. We are specifically interested in looking for changes in the character of magnetic fluctuations in ohmic L-mode as the edge plasma collisionality is changed. The key diagnostics which must be operational for this study are: A-port scanning probe (with double magnetic probe head) and F-port scanning probe. Start with a reload of shot#1040326019 which ran as a lower single-null, Ip = 0.8 MA, Bt = 5.4 tesla discharge with N04 = 0.86e20. Set ASP rest position to +14mm, FSP to -4 mm and scanning at 0.6, 0.8, 1.0 seconds. Shot#1,2 NL04 = 0.9 set up probe targets Begin density scan with two shots at each density. Alternate between A-port probe in scanning- and fixed-location modes Shot#4-14: NL04 = 0.9, 0.7, 0.5, 1.1, 1.3, 1.5 Allow for some repeated shots. If time allows, we may want to run a couple of shots in upper null topology to see if the poloidal phase velocities of the magnetic perturbations track with changes in edge plasma toroidal rotation. --------------------------------------------- If time allows, proceed to the final "three" shots required to complete (??) Ian's locked mode threshold experiments at 1MA: 1. Load 1MA shot from 1040317 and reduce density to nebar~4.5e19/m^3 (nl04~2.6e19) with acoil current =1000A. 2. Same density, run acoil current of 3500A 3. Reverse Acoil current to "-1200A" and go to density nebar=2.3e20 (nl04=1.4e20) ******************************************************************* Results ------ A pretty good run day. Brian got all of his MP393 done, and then some, completing a density scsn from 3e19 1040213006, with reprogrammed density. He turned the run over to the second MP at ~15:10, after shot#29. Getting to low density under feedback control was quite successful. I adjusted the pg3 feedforward in seg2 as I changed the nl04 request and was able to get pretty much what I asked for. Even the 3e19 800kA case still had some gas puff going. During the last shot in Ian's part of the run I dropped the nl04 P gain from 8 to 4, which seemed to reduce the oscillations in the gas puff and steady the density. It helped that we went in the direction of decreasing density on these sequences, so that the walls were unloading. It was also necessary (?) to increase the pg4 puff in seg 1 to keep the breakdown good. The lowest density points in the MP393 run had moderate runaways, building up some during the shot. Ian's shots, at even lower density, had large, saturating hard xray levels. On the low density shots#11, 12, and 13 RF and DNB fired late in the pulse so Vincent could check his signals and noise in preparation for tomorrow's run. There were H-modes at quite low density on #11 and 12; on #13 the RF reduced power and the density was even lower (nl4=3e19) and there was no H-mode. These discharges should be evaluated in terms of the "low density H-mode limit". The locked mode MP#386 was not as successful. We started with fizzles and early disruptions (and finished that way too). Only 3 useful plasmas (and 5 fizzles or disruptions) were produced in this part of the run. Attempts to refine the threshold of point #1 only provided a lower bound of 500A, (shots #33 and 36 were unlocked). However, this was enough information to cast doubt on the validity of the straight line relation of nebar vs B21_app, as the expectation was that the 1000A case would lock. The high acoil current case#2 (shot#35) appeared to have a locked mode at acoil current of 3500A, although the signature was less than clear; basically only the magnetics signals seemed to have a transition, while the sawteeth and nl04 had no obvious breaks. We did not attempt a lower positive current to refine the threshold in the region of point#2. We did not get to try the high density, adverse current case #3. There were a number of early disruptions, apparently associated with injections near segment switch, OH crowbar, and/or OH1 crossover, early in the run and again late in the day. No solution was found; we basically just ended up waiting for the machine to clean up again. There were also two computer-related no power shots, and one no TF shot (the usual unexplained failure) on shot#2. On one of the no power shots (#15) the magnetics data from shot 14 was stored again because the cpci did not get initialized. The first (and last) attempt by Brian to dwell the ASP on shot#3 seemed to cause excess fueling from the probe, as the density went considerably higher than programmed with the gas valve off after .38sec. Aftr that Brian decided to use the ASP only in scan mode, and we did the density scan at intervals of 0.1e20 instead of 0.2e20. Scorecard: ---------- Tests/NoPower 2 Duds (no TF) 1 fizzles 3 Early disruption 6 (0.1 ============ == Shots 37 |
| Session Leader Comments | |||
| Apr 14 2004 09:07:24:583AM | 1040414001 | Brian Labombard | Shot 01 FSP, ASP, ISP scanning at .65, .85. 1.05 NL04=.98 ASP - double magnetic probe head FSP - ok, could be deeper, data ok ISP - shorted electrode |
| Apr 14 2004 09:39:14:693AM | 1040414003 | Brian Labombard | Shot 03 FSP, ISP scanning at .65, .85. 1.05 ASP dwelling, trig=0.8s NL04=1.14 ASP - double magnetic probe head FSP - ok, could be deeper, data ok ISP - shorted electrode |
| Apr 14 2004 10:19:55:007AM | 1040414006 | Brian Labombard | Shot 06 FSP, ASP, ISP scanning at .65, .85. 1.05 NL04=.9 ASP - double magnetic probe head FSP - ok, could be deeper, data ok ISP - shorted electrode |
| Apr 14 2004 10:28:19:817AM | 1040414007 | Brian Labombard | Shot 07 FSP, ASP, ISP scanning at .75, .95. 1.15 NL04=.9 ASP - double magnetic probe head - nice signals FSP - excellent data ISP - shorted electrode |
| Apr 14 2004 10:43:48:340AM | 1040414008 | Brian Labombard | Shot 08 FSP, ASP, ISP scanning at .75, .95. 1.15 NL04=.77 ASP - double magnetic probe head - nice signals FSP - excellent data - getting deep ISP - shorted electrode |
| Apr 14 2004 10:57:41:970AM | 1040414009 | Brian Labombard | Shot 09 FSP, ASP, ISP scanning at .75, .95. 1.15 NL04=.72 ASP - double magnetic probe head - nice signals FSP - excellent data ISP - shorted electrode |
| Apr 14 2004 11:17:26:970AM | 1040414010 | Brian Labombard | Shot 10 FSP, ASP, ISP scanning at .75, .95. 1.15 NL04=.63 ASP - double magnetic probe head - nice signals FSP - excellent data - getting deep again ISP - shorted electrode |
| Apr 14 2004 11:30:15:193AM | 1040414011 | Brian Labombard | Shot 11 FSP, ASP, ISP scanning at .75, .95. 1.15 NL04=.5 ASP - double magnetic probe head - nice signals FSP - excellent data - deep but ok ISP - shorted electrode |
| Apr 14 2004 11:47:31:343AM | 1040414012 | Brian Labombard | Shot 12 FSP, ASP, ISP scanning at .75, .95. 1.15 NL04=.4 ASP - double magnetic probe head - nice signals FSP - excellent data - deep ISP - shorted electrode |
| Apr 14 2004 12:03:26:713PM | 1040414013 | Brian Labombard | Shot 13 FSP, ASP, ISP scanning at .75, .95. 1.15 NL04=.3 ASP - double magnetic probe head - ok FSP - ok ISP - shorted electrode |
| Apr 14 2004 12:03:52:197PM | 1040414014 | Brian Labombard | Shot 14 FSP, ASP, ISP scanning at .75, .95. 1.15 NL04=.95 ASP - double magnetic probe head - ok FSP - ok, could be deeper ISP - shorted electrode |
| Apr 14 2004 12:40:37:397PM | 1040414016 | Brian Labombard | Shot 16 FSP, ASP, ISP scanning at .75, .95. 1.15 NL04=1.15 to 1.2 ASP - double magnetic probe head - ok FSP - ok, could be deeper ISP - shorted electrode |
| Apr 14 2004 12:47:01:250PM | 1040414017 | Brian Labombard | Shot 17 FSP, ASP, ISP scanning at .75, .95. 1.15 NL04=1.0, disrupts after first scan ASP - double magnetic probe head - ok FSP - ok ISP - shorted electrode |
| Apr 14 2004 01:02:55:303PM | 1040414018 | Brian Labombard | Shot 18 FSP, ASP, ISP scanning at .75, .95. 1.15 NL04=1.2 to 1.3 ASP - double magnetic probe head - ok FSP - ok, would like it to be deeper ISP - shorted electrode |
| Apr 14 2004 01:30:37:830PM | 1040414019 | Brian Labombard | Shot 19 FSP, ASP scanning at .75, .95. 1.15 NL04=1.3, 1.5, 1.6 ASP - double magnetic probe head - ok FSP - ok, try for deeper |
| Apr 14 2004 01:30:58:597PM | 1040414020 | Brian Labombard | Shot 20 FSP, ASP scanning at .75, .95. 1.15 NL04=1.4, 1.5, 1.65 ASP - double magnetic probe head - ok FSP - ok, try for deeper |
| Apr 14 2004 01:52:07:863PM | 1040414022 | Brian Labombard | Shot 22 FSP, ASP scanning at .75, .95. 1.15 NL04=1.4, 1.5, 1.58 ASP - double magnetic probe head - ok FSP - ok |
| Apr 14 2004 02:06:20:527PM | 1040414023 | Brian Labombard | Shot 23 USN, FSP, ASP scanning at .75, .95. 1.15 NL04=.88 ASP - double magnetic probe head - ok, could be deeper FSP - nice |
| Apr 14 2004 02:29:14:987PM | 1040414025 | Brian Labombard | Shot 25 USN, FSP, ASP scanning at .75, .95. 1.15 NL04=0.7 ASP - double magnetic probe head - ok FSP - nice |
| Apr 14 2004 03:22:06:287PM | 1040414029 | Brian Labombard | Shot 29 USN, FSP, ASP scanning at .75, .95. 1.15 NL04=0.6, .54, .48 ASP - double magnetic probe head - ok FSP - nice |
| Physics Operator Comments | |||
| Apr 14 2004 06:53:04:580AM | Steve Wolfe | Engineering setup for Wednesday 14-Apr-2004 MP#393 "Magnetic fluctuations associated with edge plasma turbulence" SL: LaBombard followed by (time permitting) MP#386 "locked mode thresholds" SL: Hutchinson PO: Wolfe ECDC overnight on Sunday (D2) Run begins at 09:00 and ends at 17:00. Power systems the same as 1040326019 A-coils should be configured as on 1040331001 (+Dtop -Dbot -Jtop +Jbot), 3kA, 600V, enabled. Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) leave B-side upper with 15 psi He3 Hybrid disabled (not connected) fill C-side with 30 psi D2 Hybrid enabled (PG3) fill J-side with 30 psi D2 Hybrid disabled (PG2) Disable NINJA Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB ------------------------------------------------------------------------------- RF Setup: NO RF Required ------------------------------------------------------------------------------- Run Plan for MP#393: The purpose is to characterize broad-band magnetic fluctuations associated with plasma turbulence in the vicinity of the magnetic separatrix. We will use the two-coil magnetic probe head installed on the A-port drive (ASP) to record poloidal magnetic field fluctuations (frequency and k-poloidal resolved) as a function of depth in the scrape-off layer. We are specifically interested in looking for changes in the character of magnetic fluctuations in ohmic L-mode as the edge plasma collisionality is changed. The key diagnostics which must be operational for this study are: A-port scanning probe (with double magnetic probe head) and F-port scanning probe. Start with a reload of shot#1040326019 which ran as a lower single-null, Ip = 0.8 MA, Bt = 5.4 tesla discharge with N04 = 0.86e20. Set ASP rest position to +14mm, FSP to -4 mm and scanning at 0.6, 0.8, 1.0 seconds. Shot#1,2 NL04 = 0.9 set up probe targets Begin density scan with two shots at each density. Alternate between A-port probe in scanning- and fixed-location modes Shot#4-14: NL04 = 0.9, 0.7, 0.5, 1.1, 1.3, 1.5 Allow for some repeated shots. If time allows, we may want to run a couple of shots in upper null topology to see if the poloidal phase velocities of the magnetic perturbations track with changes in edge plasma toroidal rotation. --------------------------------------------- If time allows, proceed to the final "three" shots required to complete (??) Ian's locked mode threshold experiments at 1MA: 1. Load 1MA shot from 1040317 and reduce density to nebar~5e19/m^3 (nl04~3e19) with acoil current =1000A. 2. Same density, run acoil current of 3500A 3. Reverse Acoil current to "-1200A" and go to density nebar=2.3e20 (nl04=1.4e20) | |
| Apr 14 2004 06:59:07:450AM | Steve Wolfe | PCS setup for 1040414: Load from 1040326019 (all segs) Decrease pg4 puff from 18msec to 14msec Keep br0=0, ic_ef4=-1335 note nl04=.85; I'm not sure from Blab's run plan if he wants this raised to .90 or not, so leave it for now. Load at 14-Apr-2004 06:58:22.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| Apr 14 2004 07:27:41:367AM | Steve Wolfe | PCS setup for 1040414: The reference shot 1040326019 has RF; it also seems to have the A-coils disabled, although the program is there for a 2500A pulse. I'll check with Brian to see if he wants them on or off. | |
| Apr 14 2004 08:28:55:680AM | Steve Wolfe | Brian says he does want nl04=.9 on the first shot. Change nl04 program to 9.5e19, and program pg3 for 30V maintenance level Load at 14-Apr-2004 08:28:45.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| Apr 14 2004 09:01:51:870AM | 1040414001 | Steve Wolfe | shot#1: plasma full length. Got closer to 1 than .9 next shot: drop nl04 demand back down to 8.8e19 |
| Apr 14 2004 09:07:11:600AM | 1040414001 | Steve Wolfe | shot#1: plasma full length. Got closer to 1 than .9 A few early runaways. small injection after 1.4sec next shot: drop nl04 demand back down to 8.8e19 |
| Apr 14 2004 09:15:18:157AM | 1040414002 | Steve Wolfe | shot#2: drop nl04 demand back down to 8.8e19 move rcur out by 1.5mm at 1.5s, 0.8mm at 1.0s, trying to flatten the outer gap trace. NO TF. |
| Apr 14 2004 09:39:37:553AM | 1040414003 | Steve Wolfe | shot#3: Try again. drop nl04 demand back down to 8.8e19 move rcur out by 1.5mm at 1.5s, 0.8mm at 1.0s, trying to flatten the outer gap trace. plasma disrupts at 1.4sec; small runaway dump at .1sec density too high, around 1.2e20. No problem on tci, gas is off after .38sec Are we fueling from the probe?? next shot: back to scanning mode, out another 1.5mm on rcur |
| Apr 14 2004 09:46:40:190AM | 1040414004 | Steve Wolfe | shot#4: back to scanning mode, out another 1.5mm on rcur at 1.5sec Short disruption, 135ms; injection around 50msec, next shot: raise pg4 to 16msec |
| Apr 14 2004 10:00:57:527AM | 1040414005 | Steve Wolfe | shot#5: raise pg4 to 16msec disrupts at .33sec More injections. Still some runaways. next shot: Raise pg4 again, tweak early ip program |
| Apr 14 2004 10:09:36:007AM | 1040414006 | Steve Wolfe | shot#6: : Raise pg4 to 18ms, tweak early ip from 700 to 650@0.1sec plasma; almost lose it .12sec, big marfe early then recovers. next shot: reduce early nl04 rise, and seg1 pg3. |
| Apr 14 2004 10:28:07:927AM | 1040414007 | Steve Wolfe | shot#7: nl04 rise to 0.4sec, and seg1 pg3 down to 50V move rcur point at 1 sec out by 1.5mm plasma full length, no marfe, no current glitch Looks good. next shot- down to 0.8e19 |
| Apr 14 2004 10:43:39:747AM | 1040414008 | Steve Wolfe | shot#8: nl04 from .88 to .78, pg3 seg 2 from 30 to 15V plasma full length, nl4=7.6 to 7.8e19, looks good except for injections at the probe sweeps and at crossover around 0.5sec next shot: down to 0.7e20 |
| Apr 14 2004 10:52:46:450AM | 1040414009 | Steve Wolfe | shot#9: nl04 down to 0.7e20; raise pg4 to 20msec plasma full length nl04~0.7e20, some wobbles. looks like some dithers on Halpha around 1sec and 1.5sec next shot: down to 0.6e20 |
| Apr 14 2004 11:08:11:347AM | 1040414010 | Steve Wolfe | shot#10: nl04 down to 0.6e20; pg3 maint level off plasma full length, 6e19 next shot: down to 5e19 |
| Apr 14 2004 11:22:11:883AM | 1040414011 | Steve Wolfe | shot#11: nl04 down to 0.5e20; pg3 seg 2 off completely RF will fire late for Vincent. Beam time adjusted. plasma full length, 5e19. H-mode at 1.21sec when the RF comes on Got E and J, no D next shot: down to 4e19 |
| Apr 14 2004 11:37:59:720AM | 1040414012 | Steve Wolfe | shot#12: nl04 down to 4e19 plasma full length, 4e19; hmode at 1.22sec or so Still no D-port; E and J ok. next shot: go to 0.3 |
| Apr 14 2004 11:48:32:330AM | 1040414013 | Steve Wolfe | shot#13: nl04 down to 3e19 ! plasma full length, nl04=3e19; no h-mode still no d-port. next shot: nl04=1e20 |
| Apr 14 2004 12:01:46:007PM | 1040414014 | Steve Wolfe | shot#14:nl04 to 1e20 and pg3 to 30V maint after 50V early seg2 plasma full length, nl4=.97e20 next shot: 1.1e20 |
| Apr 14 2004 12:16:06:327PM | 1040414015 | Steve Wolfe | shot#15:nl04 to 1.1e20 and pg3 to 40V maint after 50V early seg2 No power shot -- Data system/tree not found problem Magnetics data from previous shot! Seems to have been something T&J did by mistake? Expect next shot to be ok? |
| Apr 14 2004 12:23:51:590PM | 1040414016 | Steve Wolfe | shot#16:nl04 to 1.1e20 and pg3 to 40V maint after 50V early seg2 plasma full length, nl04=1.25e20; too much maintenance gas? next shot: drop the maintenance down to 15V, decrease pg4 puff |
| Apr 14 2004 12:39:48:080PM | 1040414017 | Steve Wolfe | shot#17:drop the maintenance down to 15V, decrease pg4 puff from 20->16msec plasma disrupted at .7861, injection at .75 on the probe poke nl04 was 1.0, so I should probably increase the maint level to 25V next shot: raise pg3 maint to 25V |
| Apr 14 2004 12:58:39:690PM | 1040414018 | Steve Wolfe | shot#18: raise pg3 maint to 25V, raise nl04 to 1.3 plasma to 1.85sec, nl4=1.3 with some wobulation. Pokes could be doing a little fueling. next shot: 1.4 |
| Apr 14 2004 01:08:55:250PM | 1040414019 | Steve Wolfe | shot#19:nl4 to 1.4e20 at .5sec; early point from .4 to .5e20 plasma to 1.85sec, nl4 between 1.4 and 1.7e20; looks like may have been fueled by the second poke. next shot: repeat |
| Apr 14 2004 01:24:10:993PM | 1040414020 | Steve Wolfe | shot#20: repeat, except drop pg4 from 16 to 14msec plasma to 1.85sec nl4 from 1.4 to 1.7e20 next shot: repeat |
| Apr 14 2004 01:36:06:310PM | 1040414020 | Steve Wolfe | shot#21: repeat with slightly different probe targeting Data system hangs in init No power shot. |
| Apr 14 2004 01:47:20:480PM | 1040414022 | Steve Wolfe | shot#22: repeat of 20 with slightly different probe targeting plasma to 1.8sec, similar to 20 next shot: upper null |
| Apr 14 2004 02:01:59:270PM | 1040414023 | Steve Wolfe | shot#23: load from 1040213006 (seg 3 uupper null) reload seg1 from 1040414022 nl04 change to 0.9e20, pg3 maint to 25V ip[0.1] from 600->650kA Got one factor message in load plasma full length, nl04=8.9e19 next shot: go to 1.1e20 |
| Apr 14 2004 02:13:46:850PM | 1040414024 | Steve Wolfe | shot#24: go to nl04=1.1e20 plasma full length, almost lost it at .1 with a big current glitch early marfe. nl04 ok at 1.1e20 next shot: go down to 0.7e20 |
| Apr 14 2004 02:27:44:233PM | 1040414025 | Steve Wolfe | shot#25: drop nl04 to 0.7e20,pg3 maint to 15V Change first zcur point to -.003 from -.009 pg4 to 16ms plasma full length, nl4=7->6e19 glitch at .1 is gone, still some crossover thrash. next shot: 0.5e20 |
| Apr 14 2004 02:45:45:933PM | 1040414026 | Steve Wolfe | shot#26: drop nl04 to 0.5e20,pg3 maint to 0, most of early seg2 pg3 off Eliminate rcur point near crossover time plasma full length, nl04=5->4e19 big CII excursion in startup, nearly lost it. next shot: pg4 to 19ms. nl04 to 0.6 |
| Apr 14 2004 02:59:51:940PM | 1040414027 | Steve Wolfe | shot#27: nl04 to 0.7e20,pg4 to 19ms from 16 short disruption, the glitch at seg switch came back next shot: just repeat |
| Apr 14 2004 03:07:55:623PM | 1040414028 | Steve Wolfe | shot#28: just repeat And it did, disrupts at 300msec This is like what happened at the start of the day on 4,5,and 6? next shot: try one more |
| Apr 14 2004 03:18:38:063PM | 1040414029 | Steve Wolfe | shot#29: try one more plasma full length. mnl04=5e19, some early glitches End of MP393. next shot: Go to Ian's shots |
| Apr 14 2004 03:32:13:600PM | 1040414030 | Steve Wolfe | shot#30: Import seg2 from 1040317025 (1MA SNL from Ian's run) reduce nl04 to 2.6e19, drop pg3 maint to 0 Program acoil to 1500A fizzle. pressure may be a touch high next shot: repeat |
| Apr 14 2004 03:48:48:923PM | 1040414031 | Steve Wolfe | shot#31: repeat for Ian's condition#1 early disruption. Current turns around at .1sec, recovers, then disrupts at .3, runaway dump at the disruption next shot: drop ip[.1] from 700->600kA, reduce rcur near crossover |
| Apr 14 2004 03:55:50:200PM | 1040414032 | Steve Wolfe | shot#32: drop ip[.1] from 700->600kA, reduce rcur near crossover fizzle. next shot: drop pg4 to 17msec |
| Apr 14 2004 04:14:06:617PM | 1040414033 | Steve Wolfe | shot#33: drop pg4 to 17msec, while I'm at it reduce seg1 pg3 to 40V plasma full length, nl04=2.3 falling to 1.5e19; acoil at 1000A NO LOCKED Mode; not the expected result. Next shot: Raise Acoil current to 4000A for condition 2 |
| Apr 14 2004 04:17:47:997PM | 1040414033 | Steve Wolfe | shot#34: drop pg4 to 17msec, while I'm at it reduce seg1 pg3 to 40V plasma full length, nl04=2.3 falling to 1.5e19; acoil at 1000A NO LOCKED Mode; not the expected result. Next shot: Raise Acoil current to 4000A for condition 2 |
| Apr 14 2004 04:27:54:230PM | 1040414034 | Steve Wolfe | shot#34: Raise Acoil current to 4000A for condition 2,move late pg3 to +10Vfrom negative early disruption. .25sec next shot: repeat |
| Apr 14 2004 04:42:43:160PM | 1040414035 | Steve Wolfe | shot#35: Repeat Acoil current to 4000A for condition 2,move late pg3 to 10V from negative plasma full length, 2 Not visible on ece or nl04 next shot: Acoil to 500A, |
| Apr 14 2004 04:54:23:400PM | 1040414036 | Steve Wolfe | shot#36: Acoil to 500A, reduce P gain on nl04 from 8 to 4 Another try for case 1 at lower acoil current plasma full length, some runaways less oscillation on 1.8 next shot: Turn off acoil |
| Apr 14 2004 05:04:42:193PM | 1040414037 | Steve Wolfe | shot#37: Acoil to 0A Another try for case 1 as intrinsic fizzle CO2 had a glitch too, so the feedback probably wouldn't have worked anyway END OF RUN |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:57:21:193AM | Plasma | Ok | |
| 2 | 09:13:02:920AM | Plasma | Bad | No TF on this Shot |
| 3 | 09:25:20:393AM | Plasma | Ok | |
| 4 | 09:41:01:103AM | Plasma | Ok | |
| 5 | 09:53:29:450AM | Plasma | Ok | |
| 6 | 10:06:19:660AM | Plasma | Ok | |
| 7 | 10:19:05:160AM | Plasma | Ok | |
| 8 | 10:35:02:187AM | Plasma | Ok | |
| 9 | 10:47:50:673AM | Plasma | Ok | |
| 10 | 11:00:50:850AM | Plasma | Ok | |
| 11 | 11:16:34:470AM | Plasma | Ok | |
| 12 | 11:29:33:537AM | Plasma | Ok | |
| 13 | 11:43:47:447AM | Plasma | Ok | |
| 14 | 11:56:19:983AM | Plasma | Ok | |
| 15 | 12:09:44:550PM | Plasma | Bad | No Data System |
| 16 | 12:19:47:050PM | Plasma | Ok | |
| 17 | 12:32:12:773PM | Plasma | Ok | |
| 18 | 12:50:58:490PM | Plasma | Ok | |
| 19 | 01:04:23:070PM | Plasma | Ok | |
| 20 | 01:16:52:450PM | Plasma | Ok | |
| 22 | 01:43:39:147PM | Plasma | Ok | |
| 23 | 01:56:30:323PM | Plasma | Ok | |
| 24 | 02:09:35:720PM | Plasma | Ok | |
| 25 | 02:22:16:210PM | Plasma | Ok | |
| 26 | 02:36:53:937PM | Plasma | Ok | |
| 27 | 02:49:29:283PM | Plasma | Ok | |
| 28 | 03:02:13:710PM | Plasma | Ok | |
| 29 | 03:14:58:587PM | Plasma | Ok | |
| 30 | 03:28:14:343PM | Plasma | Ok | |
| 31 | 03:40:43:550PM | Plasma | Ok | |
| 32 | 03:53:25:147PM | Plasma | Ok | |
| 33 | 04:06:13:200PM | Plasma | Ok | |
| 34 | 04:20:55:253PM | Plasma | Ok | |
| 35 | 04:33:42:943PM | Plasma | Ok | |
| 36 | 04:47:27:887PM | Plasma | Ok | |
| 37 | 05:00:36:093PM | Plasma | Ok | |