Miniproposals

Miniproposal: 387 Date Filed: 2/4/2004 Title: Dependence of locked mode thresholds on q95 First Author: Steve Wolfe Session Leader: Steve Wolfe (shots 1-33)

Engineering Operator Run Comment

MP# 387 Dependance Of Locked Mode Tresholds on q95 or MP#386 Locked Mode

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:02:540PM

Author: Steve Wolfe

Session Leader Summary for Tues. 2/10/2004 MP#387 q-scaling of locked mode threshold SL: Wolfe PO: Granetz Run Plan --------- Carry out two scans of q95, at constant B and constant I, to determine scaling of locked mode threshold. Starting from a repeat of 1030715025 (1MA, SN, 5.4T, density ramp-down shot) first carry out a q-scan by varying Bt between 6T and 3.8T, corresponding to 2.8 not energized. Then, starting from a field around 4T, scna current from 1.1MA to 0.6MA, with and without 2500A in the A-coil in standard (+Dtop -Dbot -Jtop +Jbot) configuration. Results ---------- This was a successful run. Both scans were completed. Contrary to my expectation, there is no apparent scaling with q of the locking density in the 1MA constant current scan, although the locked modes do come earlier and are more likely to result in disruptions at low q. There are certainly no step-wise changes around integral q95. Over the range 2.9 density was, with one exception, 5 exception was a shot with low early density that was rotating in the co-direction and had an early lock at nl04=4.5e19. Actually, I believe all cases with nl04<5.8e19 in this scan were co-rotating. At constant B field of 4.1T, the current scan resulted in slightly lower locking density, again with no obvious trend in q between 2.9 values of the locking density were 4.5 to 5e19 for cases with no A-coil current. A repeat of a high field 1MA shot on the last shot of the day confirmed good reproducibility and the 20-25% density difference between this case and the 4.1T case at the same q95. During the current scan we ran a few shots with the A-coil. The results seemed inconsistent with the nominal error field model, in that we got locking was observed on shot24 with q near 3 and the nominal 2/1 error field below 2G. At higher q values (lower current) locking was delayed or prevented with the same Acoil current (1400A). One interesting effect was that at low density and low field we had a number of cases where the core rotation changed from counter to co. These cases tended to lock at lower density than the counter rotating shots. This effect probably bears on Ian's MP#386, although I'm not sure at this point exactly what it means. At any rate, John now has a good set of rotation data as a function of q at fixed B and fixed Ip. Good shots for this MP were: 3,5,8,9,10,11,12,14,16,17,21,22,(23),24,26,27,28,29,(30),31,32,32 (#23 and 30 had no locked mode with A-coil on).

Physics Operator Summaries

Entered: Jul 7 2004 04:36:48:927PM

Author: Robert Granetz

Physics operator summary for run 1040115 (Thursday): MP 387 -- Dependence of locked mode thresholds on q95 Session leader: S. Wolfe Physics operator: R. Granetz Summary: Excellent day. The MP was completed, with clear results. See Steve's session leader's summary for physics details. Plasma operation was very reliable today. NO FIZZLES! We ran a range of toroidal fields and a range of plasma currents without any difficulties, other than some early problems with the TCI density signal. For this reason, we ran most of the day with preprogrammed gas puffing instead of TCI feedback. Since most shots had locked modes, there were numerous disruptions, many at 1 MA, but this didn't impact plasma startup reliability at all. We also had a number of disruptions due to impurity injections, including shot 1040210020, which had an enormous bite taken out of the current early in the shot, and makes for a very interesting video on the wide2 view. Scorecard: 30 plasmas 0 fizzles !!!!!! 1 duds (no TF) 2 tests or no-power shot cycles 0 aborted and/or screwed up by computer problems 0 beam-into-gas calibration shots with B-field(s) ---------- 33 total ------------------------------------------------------------------------------- Engineering setup for Tuesday, 10 Feb 2004 MP 387 -- Dependence of locked mode thresholds on q95 Session leader: S. Wolfe Physics operator: R. Granetz ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Bake at 60 C overnight as well. Run begins at 09:00 and ends at 17:00. Power systems the same as 1030715025 (1.0 MA, 5.4 T, lower X-point, locked mode disruption) A-coils should be hooked up as on 1031204037 (+Dtop -Dbot -Jtop +Jbot), BUT its power supplies should be DISABLED. 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 as is Hybrid DISABLED (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) Disable NINJA Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB Necessary diagnostics: ECE (FRCECE if possible, GPC and GPC2 with gratings adjusted to give coverage over as much of the requested TF range as possible) Desirable diagnostics: HIREX (with argon puffing) for core rotation ------------------------------------------------------------------------------- RF Setup: none ------------------------------------------------------------------------------- Run Plan: MP 387 will start with 1 MA, 5.4 T, lower X-point, no A-coils, and a density rampdown. We will then run a series of discharges at different toroidal fields (up to 6 T and down to 3.8 T), paying particular attention to the locked mode density threshold around q=3 and 4 integer values. We will then switch to 4 T and scan Ip from 1.1 MA down to 0.6 MA, with and without the A-coils enabled (at 2500 A). ------------------------------------------------------------------------------- ECDC was done overnight, but no 60 C bake. Hybrid coldstart done by the engineering group; no errors found Loaded PCS segment 1 from shot 1040209001 PCS segment 2 from shot 1030715025 seg 2 (1.0 MA, 5.4 T, low density locked mode disruption), but reduce A-coil current to 2500 A (but leave disabled for first part of run) PCS segment 3 from shot 1040115001 seg 3 (0.8 MA, 5.4 T, upper null), but decrease nl_04 to 0.84e20 m-2 (nebar=1.4e20 m-3) and increase Ip to 1.0 MA. This segment has been programmed in case we decide to switch to Ian's MP 386 during the day. The A-coil configuration would have to switched to 'E' (three coils only). ------------------------------------------------------------------------------- Shot 01 -- Test of shot cycle. OK. Shot 02 -- No-power shot cycle (computers hung). Shot 03 -- Plasma. Good shot. 1.0 MA, 5.4 T. Got a locked mode at t=1.1 s, although the shot didn't disrupt until halfway through rampdown. No A-coils. nl_04=0.58e20 m-2 at the start of locked mode. Next shot: raise Btor to 6 T. Also tweak Br0 a teeny bit. Shot 04 -- Plasma. Good shot. 1.0 MA, 6.0 T, q95=4.1-4.2. Density feedback screwed up, and we don't know what the density was. (TS is not working today.) SXR show sawteeth. ECE channels do not show central Te, due to the field. No locked mode. Next shot: repeat, with TCI working. Shot 05 -- Plasma. Good shot. 1.0 MA, 6.0 T, q95=4.1. Locked mode starts at t=1.16 s. nl_04=0.67e20 m-2 at time of locking. No A-coils. Next shot: turn off density (both feedback and pre-programmed) after t=0.2 s in order to unload the walls. Also reduce Br0 again. It will be at +0.2 mT for subsequent shots. Shot 06 -- Plasma. Good shot. Got very low density and LOTS of hard x-rays. nl_04=0.2e20 m-2. So we definitely unloaded the walls. Locked mode status is unclear. 1.0 T, 6.0 T. Next shot: return the density control back to normal (same as before shot 06, and reduce Btor to 5.8 T. Shot 07 -- Plasma. Good shot. 1.0 MA, 5.8 T, q95=4.0-4.1. TCI screwed up again. We don't know the density, and the gas went full on, so this shot is no good. Next shot: turn off the density feedback (by zeroing the P gain), and load the pre-programmed voltage for the PG3 from the M-out trace (x 10) on shot 05. Shot 08 -- Plasma. Good shot. 1.0 MA, 5.8 T, q95=4.0. Density was about nl_04=0.65e20 m-2. Locked mode started at t=1.0 s. There was an impurity injection just about at the same time, just to confound things. Next shot: reduce Btor to 5.65 T. Shot 09 -- Plasma. Good shot. 1.0 MA, 5.69 T, q95=3.85. Locked mode again starts at t=1.0 s. nl_04=0.59e20 m-2 at that time. Still no A-coils. Next shot: reduce Btor to 5.3 T. Shot 10 -- Plasma. Good shot. 1.0 MA, 5.3 T, q95=3.6. There was a perturbation to the ECE sawteeth around t=0.75 s, but I'm not this was a locked mode. Density got down pretty low, resulting in some hard x-rays. Argon velocity is positive until t=0.7 s, when it drops to zero. Next shot: add gas using PG3 programming in both segment 1 (a la Earl's run yesterday) and segment 2. Shot 11 -- Plasma. Good shot. 1.0 MA, 5.3 T, q95=3.7. Locked mode begins at t=1.14 s. Density was back to previous levels. nl_04=0.7e20 m-2 at the time of locking. Next shot: reduce Btor to 5.1 T Shot 12 -- Plasma. Good shot. 1.0 MA, 5.1 T, q95=3.5. Locked mode begins at t=1.0 s. nl_04=0.66e20 m-2 at locking time. Next shot: reduce Btor to 4.9 T. Shot 13 -- Plasma. Disrupted at t=0.60 s due to an injection. Btor=4.95 T. Next shot: repeat, hopefully without the injection. Brian will be running the scanning probes. Shot 14 -- Plasma. Good shot. 1.0 MA, 4.93 T, q95=3.4-3.45. Disrupted at t=1.18 s, possibly due to 2nd probe scan. nl_04=0.55e20 m-2 at lock time. Still no A-coils. Next shot: reduce Btor to 4.6 T Shot 15 -- Plasma. Disrupted at t=0.75 s due to a large injection. Shower of sparks seen after the disruption. Btor=4.69 T Next shot: repeat, hopefully without the disruption. Adjust Btor to 4.6 T There will be a delay while a problem with the OH and EF resistance temperature readings is investigated. Shot 16 -- Plasma. 1.0 MA, 4.65 T, q95=3.2. Locked mode occurs at t=0.78 s, when nl_04=0.48e20 m-2. Next shot: reduce Btor to 4.4 T Shot 17 -- Plasma. 1.0 MA, 4.4 T, q95=3.05. Locked mode at t=0.79 s. Some really weird behavior on the ECE channels from t=0.8-1.2 s, terminated by a disruption at t=1.18 s. Next shot: same field; increase PG3 programmed voltage some. Shot 18 -- Plasma. Disrupted too early to be useful. Looks like another impurity injection. Next shot: try again, no changes Shot 19 -- Plasma. Disrupted very early. Next shot: reduce PG3 by reloading the waveform from shot 17, and reduce Btor to 4.1 T Shot 20 -- Plasma. Really bizarre shot. Survived an enormous injection (shows up well on video wide2 view) early in the shot that took a huge bite out of the plasma current. Then lasts until a disruption at t=1.22 s. 0.96 MA, 4.1 T, q95=2.9. Can't tell locked mode status. ECE channels have the weird oscillation on them for much of the shot. Next shot: repeat, hopefully without the injection Shot 21 -- Plasma. Good shot. 1.0 MA, 4.15 T, q95=2.9. Mode locking at t=0.87 s, following shortly thereafter by a disruption (impurity injection?). Next shot: reduce Btor to 3.9 T Shot 22 -- Plasma. Disrupted at t=0.65 s. 0.95 MA, 3.96 T, q95=2.86. May have been a locked mode, but definitely not unambiguous. Next shot: start the 2nd portion of this MP, which consists of a current scan at Btor=4.1 T. Start with Ip=1.0 MA, but turn on A-coils. Shot 23 -- Plasma. Good shot. No locked mode, as expected, with the A-coils in this configuration and amplitude. 1.0 MA, 4.1 T, q95=2.9-3. A-coil current = 2.1 kA. Next shot: reduce A-coil current programming to 1800 A (from 2500 A) Shot 24 -- Plasma. Good shot. Looks like a locked mode began at t=1.39 s followed by an injection 10 ms later, which causes a disruption. 1.0 MA, 4.1 T, 2.95, A-coil current (actual)=1400 A. Next shot: reduce A-coil programmed current to 900 A. Shot 25 -- Dud. No TF. Next shot: try again. Shot 26 -- Plasma. Good shot. Looks very similar to the previous plasma (shot 24), except that the locked mode started earlier. It turns out that when Steve asked to "change the current to 900", he really meant to change Ip to 900 kA, not I(A-coil) to 900 A. Even so, this shot confirms our expectations for these particular conditions. Next shot: reduce Ip to 900 kA and raise I(A-coil) to 1800 A. Shot 27 -- Plasma. Good shot. 0.9 MA, 4.1 T, q95=3.2. This locked at t=1.46 s. Next shot: repeat, except turn off the A-coils Shot 28 -- Plasma. Good shot. 0.9 MA, 4.1 T, q95=3.2. A-coils off. Locked mode starts at t=1.1 s. Next shot: reduce Ip to 0.75 MA. Keep A-coils off. Shot 29 -- Plasma. Good shot. 0.74 MA, 4.1 T, q95=3.7. Locked mode starts at t=1.09 s. A-coils off. Next shot: repeat, except turn on the A-coils, with I(A-coil)=1800 A Shot 30 -- Plasma. Good shot. Full length, no locked mode. 0.74 MA, 4.1 T, q95=3.7. A-coils were on. Next shot: reduce Ip to 0.6 MA, and turn off the A-coils. Shot 31 -- Plasma. Good shot. Locked mode at t=1.31 s. 0.6 MA, 4.1 T, q95=4.6. A-coils were off. Next shot: set plasma current to 0.68 MA Shot 32 -- Plasma. Good shot. Locked mode at t=1.3 s. 0.67 MA, 4.1 T, q95=4.1. Next shot: go back to the current and field of shot 08. I'll do this by loading the Ip wire from that of shot 08 (1 MA), and pasting in TF programming from shot 08. This will leave the PG3 gas programming as on shot 32. Shot 33 -- Plasma. Good shot. Locked mode at t=1.11 s, just like on shot 08. Very good confirmation of the earlier result. 1.0 MA, 5.85 T, q95=4.0. End of run.

Session Leader Comments
Feb 10 2004 09:22:34:830AM	1040210002	Steve Wolfe	Shot#2: hung in init. Ran a no-power cycle.
Feb 10 2004 09:30:53:493AM	1040210003	Steve Wolfe	Shot#3: plasma disrupted in rampdown. locked mode at 1.1sec, nl4=5.8e19, q=3.8 next shot: Bt to 6T
Feb 10 2004 09:47:11:600AM	1040210004	Steve Wolfe	Shot#4: Bt to 6T plasma full length, gas turns on hard at 0.9. density doesn't really drop.tci failure. I think there is no locked mode on this one. next shot: repeat.
Feb 10 2004 10:04:39:487AM	1040210005	Steve Wolfe	Shot#5: repeat Bt to 6T plasma disrupted at 1.7 locked mode at 1.17sec, nl4=6.8e19, density is not dropping q~4.1 next shot: turn nl4 gain off at 0.2, and turn off feed forward at same time
Feb 10 2004 10:20:18:013AM	1040210006	Steve Wolfe	Shot#6: repeat Bt to 6T, try to get back falling nl4 runaways. density dropped to 2e19. I think the locked mode actually happens at 0.45sec, when the nl4 is ~3.5e19, but it's hard to tell. next shot: back to normal density program, drop Bt to 5.8
Feb 10 2004 10:33:23:843AM	1040210007	Steve Wolfe	Shot#7: back to normal density program, drop Bt to 5.8 plasma full length, but tci failed again. gas is on full for most of the shot. next shot: repeat
Feb 10 2004 10:52:37:493AM	1040210008	Steve Wolfe	Shot#8: repeat with all programmed pg3 copied from shot 5, gain off. plasma full length, locked mode at ~1sec, 6.5e19, q=3.96 next shot: 5.65T
Feb 10 2004 11:07:42:397AM	1040210009	Steve Wolfe	Shot#9: drop field to 5.65T plasma disrupts at 1.75sec, locked mode at 1sec, nl4=5.9e19, q=3.9 next shot: drop Brt to 5.3T
Feb 10 2004 11:57:30:497AM	1040210010	Steve Wolfe	Shot#10: drop Brt to 5.3T locked mode at 0.74sec, nl4=.45e20, q=3.65 runaways start at 1sec Ar rotation is positive before locked mode. next shot: change gas program and redo
Feb 10 2004 11:43:43:403AM	1040210011	Steve Wolfe	Shot#11: change gas program and redo plasma disrupts at 1.65sec locked mode at 1.12sec nl4=6.8e19, q=3.7 next shot: go to 5.1T
Feb 10 2004 11:58:44:777AM	1040210012	Steve Wolfe	Shot#12: go to 5.1T plasma disrupts at 1.65 locked mode at sec, nl4=6.4e19,q=3.55 next shot: B=4.9T
Feb 10 2004 12:15:34:507PM	1040210013	Steve Wolfe	Shot#13: B=4.9T early disruption 0.6sec looks like an injection
Feb 10 2004 12:37:46:077PM	1040210014	Steve Wolfe	Shot#14: repeat B=4.9T plasma disrupts at 1.18 locked mode at 1.04sec, 6.5e19, q=3.45 next shot: Bt to 4.6T
Feb 10 2004 12:57:14:053PM	1040210015	Steve Wolfe	Shot#15: Bt to 4.6T disrupted at 0.75sec, big injection at .52 projectile bounces off inner wall, raises ne! next shot: repeat, hopefully without injection.
Feb 10 2004 01:09:01:040PM	1040210015	Steve Wolfe	Shot#16: Bt to 4.6T There will be a short (I Hope) delay while the engineers check on some bad resistance readings.
Feb 10 2004 01:39:12:937PM	1040210016	Steve Wolfe	Shot#16: Bt to 4.6T disrupts at 0.82 locked mode at 0.78sec, 5e19, q=3.2 next shot: go to 4.4T
Feb 10 2004 01:55:26:653PM	1040210017	Steve Wolfe	Shot#17: Bt to 4.4T disrupts at 1.17sec locked mode at .78sec, nl4=5.1e19,q=3.05 sawteeth turn very strange during mode. next shot: increase puff between .2 and .5sec
Feb 10 2004 02:01:50:147PM	1040210018	Steve Wolfe	Shot#18: Bt to 4.4T increase puff between .2 and .5sec early disruption at .53sec, looks like another injection next shot: repeat
Feb 10 2004 02:12:20:430PM	1040210019	Steve Wolfe	Shot#19: Bt to 4.4T increase puff between .2 and .5sec another early disruption, at 0.26 sec next shot: put the gas back to program of 17 and drop field to 4.1T
Feb 10 2004 02:30:39:097PM	1040210020	Steve Wolfe	Shot#20: put the gas back to program of shot 17 and drop field to 4.1T disrupts at 1.22sec, big bite out of the early current rise Something falls from the ceiling and causes a big marfe Too weird to use for locked mode case, although it does get to q=2.9 next shot: try again and hope whatever it was is gone
Feb 10 2004 02:45:16:283PM	1040210021	Steve Wolfe	Shot#21: try again and hope whatever it was is gone locked mode around .875, nl=6e19, q=2.9 there is an injection on the 2pi at .888 or so, just after the locked mode starts. next shot: go to 3.9T
Feb 10 2004 02:57:24:253PM	1040210022	Steve Wolfe	Shot#22: go to 3.9T disrupts at .65sec possible locked mode at nl4 of .68e20, q=2.9 next shot: go to 4.0 and turn on the acoil (2500A)
Feb 10 2004 03:08:23:617PM	1040210023	Steve Wolfe	Shot#23: go to 4.0 and turn on the acoil (2500A) plasma, no locked mode down to nl4=4.4e19 next shot: drop acoil current to 1800A
Feb 10 2004 03:19:07:493PM	1040210024	Steve Wolfe	Shot#24: drop acoil current to 1800A disrupts at 1,43sec, posible locked mode at 1.39sec, followed by an injection? nl4=5.3e19, q=2.95 The model says b21 is below 2G throughout, so there seems to be a problem with that. next shot: 900kA
Feb 10 2004 03:27:20:970PM	1040210025	Steve Wolfe	Shot#25: current to 900kA no TF next shot: try again
Feb 10 2004 03:43:38:827PM	1040210026	Steve Wolfe	Shot#26: try again early disruption, .61sec We're still at 1MA, Bob thought I asked for 900A on the Acoil, instead of 900kA in the plasma. next shot: Acoil to 1800A, Ip to 900kA, B stays at 4.1T
Feb 10 2004 03:54:49:330PM	1040210027	Steve Wolfe	Shot#27: Acoil to 1800A (program), Ip to 900kA, B stays at 4.1T locked mode at 1.45sec, nl4=3.4e19, q=3.2 next shot: turn off acoil, same current
Feb 10 2004 06:12:11:450PM	1040210028	Steve Wolfe	Shot#28: turn off acoil, same B, Ip disrupts at 1.03sec locked mode at 1.01sec,nl4=5e19, q=3.2 next shot: 750kA
Feb 10 2004 04:19:46:940PM	1040210029	Steve Wolfe	Shot#29: go to 750kA into rampdown, but locked mode starts at 1.07sec nl4=4.6e19, q=3.8 next shot: turn on acoil, still at 1800A program
Feb 10 2004 04:42:22:057PM	1040210030	Steve Wolfe	Shot#30: 750kA,turn on acoil, still at 1800A program plasma full length, no locked mode next shot: Ip to 600kA, acoils off
Feb 10 2004 04:45:24:067PM	1040210031	Steve Wolfe	Shot#31: Ip to 600kA, acoils off locks at 1.3sec at nl4=4.7e19, q=4.7 next shot: Ip to 680kA
Feb 10 2004 04:59:58:893PM	1040210032	Steve Wolfe	Shot#32: Ip to 680kA plasma to 1.6, locked mode at 1.3sec, nl4=5.1e19, q=4.1 next shot: go back to 1MA, 5.8T (like shot#8)
Feb 10 2004 05:09:51:257PM	1040210033	Steve Wolfe	Shot#33: go back to 1MA, 5.8T (like shot#8) locked mode at 1.1sec, nl4=6.3e19, q=4.04 It looks like a good repeat, so we haven't been changing during the day. END OF RUN

Physics Operator Comments
Feb 9 2004 05:39:05:120PM		Robert Granetz	Engineering setup for Tuesday, 10 Feb 2004 MP 387 -- Dependence of locked mode thresholds on q95 Session leader: S. Wolfe Physics operator: R. Granetz ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Bake at 60 C overnight as well. Run begins at 09:00 and ends at 17:00. Power systems the same as 1030715025 (1.0 MA, 5.4 T, lower X-point, locked mode disruption) A-coils should be hooked up as on 1031204037 (+Dtop -Dbot -Jtop +Jbot), BUT its power supplies should be DISABLED. 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 as is Hybrid DISABLED (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) Disable NINJA Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB Necessary diagnostics: ECE (FRCECE if possible, GPC and GPC2 with gratings adjusted to give coverage over as much of the requested TF range as possible) Desirable diagnostics: HIREX (with argon puffing) for core rotation ------------------------------------------------------------------------------- RF Setup: none ------------------------------------------------------------------------------- Run Plan: MP 387 will start with 1 MA, 5.4 T, lower X-point, no A-coils, and a density rampdown. We will then run a series of discharges at different toroidal fields (up to 6 T and down to 3.8 T), paying particular attention to the locked mode density threshold around q=3 and 4 integer values. We will then switch to 4 T and scan Ip from 1.1 MA down to 0.6 MA, with and without the A-coils enabled (at 2500 A).
Feb 10 2004 08:03:35:657AM		Robert Granetz	ECDC was done overnight, but no 60 C bake. Hybrid coldstart done by the engineering group; no errors found Loaded PCS segment 1 from shot 1040209001 PCS segment 2 from shot 1030715025 seg 2 (1.0 MA, 5.4 T, low density locked mode disruption), but reduce A-coil current to 2500 A (but leave disabled for first part of run) PCS segment 3 from shot 1040115001 seg 3 (0.8 MA, 5.4 T, upper null), but decrease nl_04 to 0.84e20 m-2 (nebar=1.4e20 m-3) and increase Ip to 1.0 MA. This segment has been programmed in case we decide to switch to Ian's MP 386 during the day. The A-coil configuration would have to switched to 'E' (three coils only).
Feb 10 2004 08:42:06:440AM	1040210001	Robert Granetz	Shot 01 -- Test of shot cycle. OK.
Feb 10 2004 09:17:49:133AM	1040210001	Robert Granetz	Shot 01 (again) -- No-power shot cycle (computers hung).
Feb 10 2004 09:26:23:593AM	1040210002	Robert Granetz	Shot 02 -- No-power shot cycle (computers hung).
Feb 10 2004 09:35:44:190AM	1040210003	Robert Granetz	Shot 03 -- Plasma. Good shot. 1.0 MA, 5.4 T. Got a locked mode at t=1.1 s, although the shot didn't disrupt until halfway through rampdown. No A-coils. nl_04=0.58e20 m-2 at the start of locked mode. Next shot: raise Btor to 6 T. Also tweak Br0 a teeny bit.
Feb 10 2004 09:49:50:957AM	1040210004	Robert Granetz	Shot 04 -- Plasma. Good shot. 1.0 MA, 6.0 T, q95=4.1-4.2. Density feedback screwed up, and we don't know what the density was. (TS is not working today.) SXR show sawteeth. ECE channels do not show central Te, due to the field. No locked mode. Next shot: repeat, with TCI working.
Feb 10 2004 10:07:19:857AM	1040210005	Robert Granetz	Shot 05 -- Plasma. Good shot. 1.0 MA, 6.0 T, q95=4.1. Locked mode starts at t=1.16 s. nl_04=0.67e20 m-2 at time of locking. No A-coils. Next shot: turn off density (both feedback and pre-programmed) after t=0.2 s in order to unload the walls. Also reduce Br0 again. It will be at +0.2 mT for subsequent shots.
Feb 10 2004 10:24:28:930AM	1040210006	Robert Granetz	Shot 06 -- Plasma. Good shot. Got very low density and LOTS of hard x-rays. nl_04=0.2e20 m-2. So we definitely unloaded the walls. Locked mode status is unclear. 1.0 T, 6.0 T. Next shot: return the density control back to normal (same as before shot 06, and reduce Btor to 5.8 T.
Feb 10 2004 10:42:27:880AM	1040210007	Robert Granetz	Shot 07 -- Plasma. Good shot. 1.0 MA, 5.8 T, q95=4.0-4.1. TCI screwed up again. We don't know the density, and the gas went full on, so this shot is no good. Next shot: turn off the density feedback (by zeroing the P gain), and load the pre-programmed voltage for the PG3 from the M-out trace (x 10) on shot 05.
Feb 10 2004 10:59:02:440AM	1040210008	Robert Granetz	Shot 08 -- Plasma. Good shot. 1.0 MA, 5.8 T, q95=4.0. Density was about nl_04=0.65e20 m-2. Locked mode started at t=1.0 s. There was an impurity injection just about at the same time, just to confound things. Next shot: reduce Btor to 5.65 T.
Feb 10 2004 11:07:59:523AM	1040210009	Robert Granetz	Shot 09 -- Plasma. Good shot. 1.0 MA, 5.69 T, q95=3.85. Locked mode again starts at t=1.0 s. nl_04=0.59e20 m-2 at that time. Still no A-coils. Next shot: reduce Btor to 5.3 T.
Feb 10 2004 11:30:59:730AM	1040210010	Robert Granetz	Shot 10 -- Plasma. Good shot. 1.0 MA, 5.3 T, q95=3.6. There was a perturbation to the ECE sawteeth around t=0.75 s, but I'm not this was a locked mode. Density got down pretty low, resulting in some hard x-rays. Argon velocity is positive until t=0.7 s, when it drops to zero. Next shot: add gas using PG3 programming in both segment 1 (a la Earl's run yesterday) and segment 2.
Feb 10 2004 11:42:01:483AM	1040210011	Robert Granetz	Shot 11 -- Plasma. Good shot. 1.0 MA, 5.3 T, q95=3.7. Locked mode begins at t=1.14 s. Density was back to previous levels. nl_04=0.7e20 m-2 at the time of locking. Next shot: reduce Btor to 5.1 T
Feb 10 2004 12:05:38:643PM	1040210012	Robert Granetz	Shot 12 -- Plasma. Good shot. 1.0 MA, 5.1 T, q95=3.5. Locked mode begins at t=1.0 s. nl_04=0.66e20 m-2 at locking time. Next shot: reduce Btor to 4.9 T.
Feb 10 2004 12:22:14:250PM	1040210013	Robert Granetz	Shot 13 -- Plasma. Disrupted at t=0.60 s due to an injection. Btor=4.95 T. Next shot: repeat, hopefully without the injection. Brian will be running the scanning probes.
Feb 10 2004 01:13:22:017PM	1040210015	Robert Granetz	Shot 15 -- Plasma. Disrupted at t=0.75 s due to a large injection. Shower of sparks seen after the disruption. Btor=4.69 T Next shot: repeat, hopefully without the disruption. Adjust Btor to 4.6 T
Feb 10 2004 01:14:41:797PM	1040210015	Robert Granetz	There will be a delay while a problem with the OH and EF resistance temperature readings is investigated.
Feb 10 2004 01:40:11:873PM	1040210016	Robert Granetz	Shot 16 -- Plasma. 1.0 MA, 4.65 T, q95=3.2. Locked mode occurs at t=0.78 s, when nl_04=0.48e20 m-2. Next shot: reduce Btor to 4.4 T
Feb 10 2004 01:51:54:330PM	1040210017	Robert Granetz	Shot 17 -- Plasma. 1.0 MA, 4.4 T, q95=3.05. Locked mode at t=0.79 s. Some really weird behavior on the ECE channels from t=0.8-1.2 s, terminated by a disruption at t=1.18 s. Next shot: same field; increase PG3 programmed voltage some.
Feb 10 2004 02:06:42:517PM	1040210018	Robert Granetz	Shot 18 -- Plasma. Disrupted too early to be useful. Looks like another impurity injection. Next shot: try again, no changes
Feb 10 2004 02:15:51:787PM	1040210019	Robert Granetz	Shot 19 -- Plasma. Disrupted very early. Next shot: reduce PG3 by reloading the waveform from shot 17, and reduce Btor to 4.1 T
Feb 10 2004 02:32:58:843PM	1040210020	Robert Granetz	Shot 20 -- Plasma. Really bizarre shot. Survived an enormous injection (shows up well on video wide2 view) early in the shot that took a huge bite out of the plasma current. Then lasts until a disruption at t=1.22 s. 0.96 MA, 4.1 T, q95=2.9. Can't tell locked mode status. ECE channels have the weird oscillation on them for much of the shot. Next shot: repeat, hopefully without the injection
Feb 10 2004 02:45:17:660PM	1040210021	Robert Granetz	Shot 21 -- Plasma. Good shot. 1.0 MA, 4.15 T, q95=2.9. Mode locking at t=0.87 s, following shortly thereafter by a disruption (impurity injection?). Next shot: reduce Btor to 3.9 T
Feb 10 2004 02:58:57:097PM	1040210022	Robert Granetz	Shot 22 -- Plasma. Disrupted at t=0.65 s. 0.95 MA, 3.96 T, q95=2.86. May have been a locked mode, but definitely not unambiguous. Next shot: start the 2nd portion of this MP, which consists of a current scan at Btor=4.1 T. Start with Ip=1.0 MA, but turn on A-coils.
Feb 10 2004 03:08:47:007PM	1040210023	Robert Granetz	Shot 23 -- Plasma. Good shot. No locked mode, as expected, with the A-coils in this configuration and amplitude. 1.0 MA, 4.1 T, q95=2.9-3. A-coil current = 2.1 kA. Next shot: reduce A-coil current programming to 1800 A (from 2500 A)
Feb 10 2004 03:22:05:337PM	1040210024	Robert Granetz	Shot 24 -- Plasma. Good shot. Looks like a locked mode began at t=1.39 s followed by an injection 10 ms later, which causes a disruption. 1.0 MA, 4.1 T, 2.95, A-coil current (actual)=1400 A. Next shot: reduce A-coil programmed current to 900 A.
Feb 10 2004 03:27:52:170PM	1040210025	Robert Granetz	Shot 25 -- Dud. No TF. Next shot: try again.
Feb 10 2004 03:48:54:757PM	1040210026	Robert Granetz	Shot 26 -- Plasma. Good shot. Looks very similar to the previous plasma (shot 24), except that the locked mode started earlier. It turns out that when Steve asked to "change the current to 900", he really meant to change Ip to 900 kA, not I(A-coil) to 900 A. Even so, this shot confirms our expectations for these particular conditions. Next shot: reduce Ip to 900 kA and raise I(A-coil) to 1800 A.
Feb 10 2004 03:54:27:987PM	1040210027	Robert Granetz	Shot 27 -- Plasma. Good shot. 0.9 MA, 4.1 T, q95=3.2. This locked at t=1.46 s. Next shot: repeat, except turn off the A-coils
Feb 10 2004 04:08:40:437PM	1040210028	Robert Granetz	Shot 28 -- Plasma. Good shot. 0.9 MA, 4.1 T, q95=3.2. A-coils off. Locked mode starts at t=1.1 s. Next shot: reduce Ip to 0.75 MA. Keep A-coils off.
Feb 10 2004 04:21:21:893PM	1040210029	Robert Granetz	Shot 29 -- Plasma. Good shot. 0.74 MA, 4.1 T, q95=3.7. Locked mode starts at t=1.09 s. A-coils off. Next shot: repeat, except turn on the A-coils, with I(A-coil)=1800 A
Feb 10 2004 04:33:12:893PM	1040210030	Robert Granetz	Shot 30 -- Plasma. Good shot. Full length, no locked mode. 0.74 MA, 4.1 T, q95=3.7. A-coils were on. Next shot: reduce Ip to 0.6 MA, and turn off the A-coils.
Feb 10 2004 05:02:36:843PM	1040210032	Robert Granetz	Shot 32 -- Plasma. Good shot. Locked mode at t=1.3 s. 0.67 MA, 4.1 T, q95=4.1. Next shot: go back to the current and field of shot 08. I'll do this by loading the Ip wire from that of shot 08 (1 MA), and pasting in TF programming from shot 08. This will leave the PG3 gas programming as on shot 32.
Feb 10 2004 05:11:44:880PM	1040210033	Robert Granetz	Shot 33 -- Plasma. Good shot. Locked mode at t=1.11 s, just like on shot 08. Very good confirmation of the earlier result. 1.0 MA, 5.85 T, q95=4.0. End of run.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:27:01:927AM	Test	Ok	Shot Cycle No Power
2	09:18:40:350AM	Plasma	Bad	network problem
3	09:25:37:000AM	Plasma	Ok
4	09:39:33:217AM	Plasma	Ok
5	09:55:59:353AM	Plasma	Ok
6	10:11:47:057AM	Plasma	Ok
7	10:28:02:317AM	Plasma	Ok
8	10:46:44:063AM	Plasma	Ok
9	11:03:14:073AM	Plasma	Ok
10	11:19:38:883AM	Plasma	Ok
11	11:35:57:677AM	Plasma	Ok
12	11:52:11:610AM	Plasma	Ok
13	12:09:09:827PM	Plasma	Ok
14	12:28:47:337PM	Plasma	Ok
15	12:46:11:113PM	Plasma	Ok
16	01:31:13:793PM	Plasma	Ok
17	01:43:33:353PM	Plasma	Ok
18	01:56:13:590PM	Plasma	Ok
19	02:08:56:840PM	Plasma	Ok
20	02:21:24:607PM	Plasma	Ok
21	02:33:45:017PM	Plasma	Ok
22	02:47:13:610PM	Plasma	Ok
23	02:59:41:847PM	Plasma	Ok
24	03:12:28:737PM	Plasma	Ok
25	03:25:02:363PM	Plasma	Bad	TF did not fire
26	03:37:32:300PM	Plasma	Ok
27	03:50:01:350PM	Plasma	Ok
28	04:02:29:180PM	Plasma	Ok
29	04:14:56:663PM	Plasma	Ok
30	04:27:37:480PM	Plasma	Ok
31	04:40:12:480PM	Plasma	Ok
32	04:52:38:387PM	Plasma	Ok
33	05:05:13:543PM	Plasma	Ok