Miniproposals

Miniproposal: 268 Date Filed: 4/7/2000 Title: Conditioning of D-, E-, or J-Port ICRF Antenna First Author: Gerd Schilling Session Leader: Rejean Boivin (shots 1-19) Session Leader: Steve Wukitch (shots 1-19)

Engineering Operator Run Comment

MP268 and MP248 SL:Wukitch/Greenwald PO:Wolfe EO:Dekow/Cochran

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:25:040PM

Author: To Be Determined

MP#268 ICRF development (J 4-strap) SL: Wukitch,Boivin PO: Wolfe EO: Dekow,Byford,Parkin Plan ---- Now that the ground problem has been isolated to the commutation capacitor bank, we will proceed with plasma operations, in parallel with further testing to identify and replace the bad capacitor(s). The cap banks will be put back in their original systems, so that the bad bank is on OH2L, which has a 150 Ohm resistor in series with the ground fuse. Additionally, the cap cases will be lifted off ground, and regrounded through an instrumented line, in groups, so that the one carrying ground current can be determined. In this configuration, it should be possible to operate the machine "normally". Getting the cap bank set up may take some time in the morning, so the run may start late. It will probably be necessary to run some commutation tests before first plasma to verify the system. Goals of the ICRF experiment are: 1. Measure loading as a function of power comparing D, E, and J-port. (1 shot) 2. Measure J, D, and E-port heating efficiency up to 1.5 MW each - L-mode required. (3 shots) 3. In L-mode and diverted plasmas, verify simultaneous operational capability of D, E, and J-port antennas. (2 shots) 4. Evaluation of maximum reliable power from J-port, and maximum total power from D, E, and J 5. Assuming total achievable power exceeds 3MW, determination of H-mode accessibility for upper-null targets; this will indicate whether we will do reverse the field for next week. Depending on the results of the ICRF evaluation, and on time remaining, we will proceed with MP#248 (H-mode performance at high P_rf). Engineering Setup ------------------ Overnight ECDC in D2, stopping 2 hours before the run. Power systems as on 1001003009 Gas System Setup: fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED fill B-side upper with 35 psi of D2 Hybrid DISABLED, for ECDC fill C-side with 30 psi of D2 Hybrid enabled The following gate valves should be enabled: ECE, VUV, PCX "beast" at B-port RF systems: Complete the checklist and have FMIT#1-4 to run-on by 8:00 am Use match from 1001003009. Initial waveforms from 1001003009: D-port 1.5 MW 1.2-1.45 sec E-port 1.5 MW 0.6-0.85 sec J-port 1.5 MW 0.9-1.15 sec ---------------------------------------------------------------------------- 001 request: Bt~5.2 T, Ip~0.8 MA, upper null D-port 1.3 MW 1.2-1.45 sec E-port 1.3 MW 0.6-0.85 sec J-port 1.3 MW 0.9-1.15 sec plasma - upper null, good comparison shot D-port 1.3 MW 1.2-1.45 sec E-port 1.3 MW 0.6-0.85 sec J-port 1.3 MW 0.9-1.15 sec one fault on #3 next shot: 2 MW pulses from J and D+E 002 request: Bt~5.2 T, Ip~0.8 MA, upper null D-port 1. MW 1.1-1.45 sec E-port 1. MW 1.1-1.45 sec J-port 2 MW 0.6-1. sec plasma - upper null, early disruption ~0.7 sec D-port 0 MW 1.1-1.45 sec E-port 0 MW 1.1-1.45 sec J-port 1.6 MW before #3 screen xbarred antenna then ran as a monopole and injected junk which killed the plasma good power ramp on J-port 003 request: Bt~5.2 T, Ip~0.8 MA, upper null D-port 1. MW 1.1-1.45 sec E-port 1. MW 1.1-1.45 sec J-port 2 MW 0.6-1. sec plasma - upper null, early disruption ~0.7 sec D-port 0 MW 1.1-1.45 sec E-port 0 MW 1.1-1.45 sec J-port 0.8 MW #3 was faulted by false fault indication antenna ran as a monopole and injected junk which killed the plasma remove attempted combined fault indicator for J-port 004 no power 005 request: Bt~5.2 T, Ip~0.8 MA, upper null D-port 1. MW 1.1-1.45 sec E-port 1. MW 1.1-1.45 sec J-port 2 MW 0.6-1. sec plasma - upper null, early disruption ~0.7 sec D-port 0 MW 1.1-1.45 sec E-port 0 MW 1.1-1.45 sec J-port 2 MW until #4 faulted and #3 screen xbarred 006 request: Bt~5.2 T, Ip~0.8 MA, upper null D-port 1. MW 1.1-1.45 sec E-port 1. MW 1.1-1.45 sec J-port 2 MW 0.6-1. sec plasma - upper null, early disruption ~0.7 sec D-port 0 MW 1.1-1.45 sec E-port 0 MW 1.1-1.45 sec J-port 2 MW until #3 & #4 faulted and #3 screen xbarred 007 fizzle 008 request: Bt~5.2 T, Ip~0.8 MA, upper null D-port 1. MW 1.1-1.45 sec E-port 1. MW 1.1-1.45 sec J-port 2 MW 0.6-1. sec plasma - upper null, H-mode with D and E @2 MW D-port 1 MW 1.1-1.45 sec E-port 1 MW 1.1-1.45 sec J-port 2 MW 0.6-1.0 sec need to retune next shot: inner wall limited 009 request: Bt~5.2 T, Ip~0.8 MA, inner wall limited D-port 1.25 MW 1.1-1.45 sec E-port 1.25 MW 1.1-1.45 sec J-port 2.5 MW 0.6-1. sec plasma - inner wall limited, early disruption D-port 0 MW 1.1-1.45 sec E-port 0 MW 1.1-1.45 sec J-port MW 0.6-1.0 sec #3 screen xbarred on fault early gap was 2 cm good for loading check as function of gap 010 request: Bt~5.2 T, Ip~0.8 MA, inner wall limited D-port 1.25 MW 1.1-1.45 sec E-port 1.25 MW 1.1-1.45 sec J-port 2.5 MW 0.6-1. sec plasma - inner wall limited, early disruption D-port 0 MW 1.1-1.45 sec E-port 0 MW 1.1-1.45 sec J-port 1ishMW 4 alone, lots of junk 0.6-1.0 sec #3 screen xbarred on fault early gap was 1 cm good for loading check as function of gap 011 D, 1 trip, DC0, good tune E, 3 trips, DC0 , good tune J3 screen crowbar after ~150 msec J4 5 trips, all DC0 next shot slowed down the ramp, increased filtering on crowbar circuit (#3) 012 early disruption after J went monopole J3 screen crowbar after ~150 msec J4 ran until disruption next shot increased filtering on crowbar circuit (#3) 013 request: Bt~5.2 T, Ip~0.8 MA, inner wall limited D-port 1.25 MW 1.1-1.45 sec E-port 1.25 MW 1.1-1.45 sec J-port 1.8 MW 0.6-0.84sec plasma - inner wall limited, early disruption D-port 0 MW 1.1-1.45 sec E-port 0 MW 1.1-1.45 sec J-port J4 0.85MW 0.6-0.905 (1 trip-monopole) 0.6-0.84sec #3 screen xbarred at trip next shot replace screen crowbar circuit by 480T5E 4800V, 5A fuse (150 msec at 20 amps) 014 request: Bt~5.2 T, Ip~0.8 MA, inner wall limited D-port 1.0 MW 1.1-1.45 sec E-port 1.0 MW 1.1-1.45 sec J-port 1.7 MW 0.6-1.0sec plasma - inner wall limited, early disruption D-port 0.9 MW 1.1-1.45 sec E-port 1.25 MW 1.1-1.45 sec J-port J4 0.6MW max trips 0.9MW #3 max trips fuse on XMTR 3 worked, removed the spurious screen crowbar firing however, screen current spikes visible! 015 request: Bt~5.2 T, Ip~0.8 MA, inner wall limited D-port 1.0 MW 1.1-1.45 sec E-port 1.0 MW 1.1-1.45 sec J-port 1.7 MW 0.6-1.0sec plasma - inner wall limited, early disruption D-port 1.0 MW 1.1-1.45 sec E-port 1.0 MW 1.1-1.45 sec J-port J4 0.5 MW max trips (max trip, too much cross-talk) 0.9MW #3 1 trip (but went monopole) next shot go to lower null, use tune from upper null this morning (shot 008) 016 request: Bt~5.2 T, Ip~0.8 MA, inner wall limited D-port 1.0 MW 1.1-1.45 sec E-port 1.0 MW 1.1-1.45 sec J-port 1.7 MW 0.6-1.0sec plasma - inner wall limited, early disruption D-port 1.0 MW 1.1-1.45 sec E-port 1.0 MW 1.1-1.45 sec J-port J4 0.8 MW went through, even short H modes J3 0.9MW 6 trips, but got most of the power through next shot, reduce gap a little and retune all 4 XMTRs 017 request: Bt~5.2 T, Ip~0.8 MA, inner wall limited D-port 1.0 MW 1.1-1.45 sec E-port 1.0 MW 1.1-1.45 sec J-port 1.7 MW 0.6-1.0sec plasma - inner wall limited, early disruption D-port 1.0 MW 1.1-1.45 sec E-port 1.0 MW 1.1-1.45 sec J-port J4 0.8 MW went through, 2 H-modes J3 0.6MW went through next shot, overlap all 4 for ~300 msec, raise J a bit in power little tune on all 4. 018 request: Bt~5.2 T, Ip~0.8 MA, inner wall limited D-port 1.0 MW 0.8-1.45 sec E-port 1.0 MW 0.8-1.45 sec J-port 1.7 MW 0.6-1.0sec plasma - inner wall limited, early disruption D-port 1.0 MW 0.8-1.45 sec E-port 1.0 MW 0.8-1.45 sec J-port J4 0.8 MW went through, H-modes 9 trips J3 1.0 MW went through 6 trips stub tuner appeared to have skipped getting ready for this shot. next shot, overlap all 4 for ~500msec, raise D and E in power Do a manual change for stub tuner on 3 019 request: Bt~5.2 T, Ip~0.8 MA, inner wall limited D-port 1.3 MW 0.8-1.45 sec E-port 1.4 MW 0.8-1.45 sec J-port 1.7 MW 0.6-1.3sec plasma - inner wall limited, early disruption D-port 1.5 MW 0.8-1.45 sec 8 trips E-port 1.4 MW 0.8-1.45 sec screen crowbar (same symptoms?) 4 trips J-port J4 1.0 MW, H-modes 10 trips eventually J3 1.0 MW max trips Ok shot overall, got in excess of 4MW for 100-200 msec. Best bettween 0.9 and 1.1 sec. Summary: In L-mode, we obtained a good comparison discharge (001). The heating efficiency estimated from the stored plasma energy was ~50%. Using H89P scaling, the absorbed power to obtain an H=1 is ~90%. We also obtained some loading data. We obtained one discharge with 2 MW from J-port. Higher power were not reliable because the antenna or transmission line was arcing beyond DC2. FMIT#3 screen xbar continued to fire RF trips. Installing a 480T5E (4800V, 5A) fuse (150 msec at 20 amps) in place of the screen xbar unit allowed us to observe the screen current spikes associated with antenna arcs. One idea is the screen xbar response is faster than the arc protection (both have ~5-10 usec response time) and the xbar is firing before the arc protection removes the RF drive. The screen xbar in #2 will be instrumented in the same manner to investigate if it suffers from a similar problem. The consistent antenna faulting suggests that J-port requires more voltage and power conditioning before it becomes reliable. It is clear from the operation that if one transmitter faults on J the other needs to fault as well. This will be instrumented shortly.

Physics Operator Summaries

Entered: Jul 7 2004 04:37:12:223PM

Author: To Be Determined

Physics Operator Summary for Friday, Oct 6, 2000 MP#268 ICRF development (J 4-strap) SL: Wukitch,Boivin PO: Wolfe EO: Dekow,Byford,Parkin Plan ---- Now that the ground problem has been isolated to the commutation capacitor bank, we will proceed with plasma operations, in parallel with further testing to identify and replace the bad capacitor(s). The cap banks will be put back in their original systems, so that the bad bank is on OH2L, which has a 150 Ohm resistor in series with the ground fuse. Additionally, the cap cases will be lifted off ground, and regrounded through an instrumented line, in groups, so that the one carrying ground current can be determined. In this configuration, it should be possible to operate the machine "normally". Getting the cap bank set up may take some time in the morning, so the run may start late. It will probably be necessary to run some commutation tests before first plasma to verify the system. Goals of the ICRF experiment are: 1. Measure loading as a function of power comparing D, E, and J-port. (1 shot) 2. Measure J, D, and E-port heating efficiency up to 1.5 MW each - L-mode required. (3 shots) 3. In L-mode and diverted plasmas, verify simultaneous operational capability of D, E, and J-port antennas. (2 shots) 4. Evaluation of maximum reliable power from J-port, and maximum total power from D, E, and J 5. Assuming total achievable power exceeds 3MW, determination of H-mode accessibility for upper-null targets; this will indicate whether we will do reverse the field for next week. Depending on the results of the ICRF evaluation, and on time remaining, we will proceed with MP#248 (H-mode performance at high P_rf). Engineering Setup ------------------ Overnight ECDC in D2, stopping 2 hours before the run. Power systems as on 1001003009 Gas System Setup: fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED fill B-side upper with 35 psi of D2 Hybrid DISABLED, for ECDC fill C-side with 30 psi of D2 Hybrid enabled The following gate valves should be enabled: ECE, VUV, PCX "beast" at B-port RF systems: Complete the checklist and have FMIT#1-4 to run-on by 8:00 am Use match from 1001003009. Initial waveforms from 1001003009: D-port 1.5 MW 1.2-1.45 sec E-port 1.5 MW 0.6-0.85 sec J-port 1.5 MW 0.9-1.15 sec Results: -------- We accomplished many of the RF goals, including comparison shots and loading measurements in L-mode. We actually obtained an upper null H-mode at 2MW using just D&E. J ran clean at 2MW into an L-mode target, and seemed to have quite comparable heating to D&E when the both transmitters managed to stay on. We only had a couple of shots to attempt simultaneous operation of all four transmitters in normal lower null diverted plasmas, and got short periods up to 4.5MW into EDA H-mode on the last shot. Some more development is needed to reach the goal of reliable high power operation into H-modes using the four-strap, but there is light at the end of the tunnel. Obviously, we did not get as far as starting the high performance experiments. The ground problem has been identified and the bad capacitor taken out of the circuit. We will run without replacing this cap for the time being. Details: -------- We started right off with plasma operation, continuing from the PCS setup of 1001005011. The OH2L cap bank was instrumented in groups of six. The ground fault showed up immediately, and was now present for the whole shot after commutation. The bad capacitor was quickly identified (two shots) as being the on the end closest to the control room, which Bill Cochran had suspected last night based on slight oil leakage around one terminal. This capacitor was taken out of the circuit, and the charging voltage raised to 1600V to compensate. Jport showed good heating at 1.4MW into an upper null L-mode target on the first shot. After a disruption on shot 2, the RF group tried to re-work their fault circuitry to force both J3 and J4 to fault out on a fault to either, preventing monopole operation which leads to injections and often disruptions. However, this was not successful. They also replaced a screen crowbar circuit on J3, but the screen crowbars continued for a series of shots. Shot #8 went into H-mode (our first upper null H-mode with normal field?) at 2MW from D&E. J also put out 2MW but stayed in L-mode; the balance of J3/J4 was not 1:1 on this shot, so the phase may have been funny, although it did heat. Shot#9 we went back to inner wall limited discharges, to try to stay in L-mode for a high power comparison shot. J3 continued to fault with screen crowbar trips, with J4 then running by itself and inducing disruptions. This was finally "fixed" by removing the screen crowbar and replacing it with a fuse sized to prevent damage to the tube from exceeding the screen dissipation (D. Gwinn's suggestion). The two J systems continued to have problems running together in the limiter configuration, but at shot#16 we moved on to a lower null target, so we would have some chance at running all antennas together into a normal H-mode plasma. On shot #17, J3 and J4 ran together successfully into H-mode at 1.4MW. On #18 all four overlapped briefly, but J3 and J4 weren't happy and faulted out alternately. Shots 16-18 were accidentally run with a CLEARIN ramping in between 1.0 and 1.5 sec, resulting in shrinkage of both gaps during the D&E pulses. This was corrected for shot 19. On #19 all four stayed on together for ~200msec at a total power of 4.5MW in EDA. The heating efficiency was probably fairly low, with a nominal H-factor of only about 1.5, but we did get up to 120kJ, Rneut~2e13, Te up to 3keV, betaN=1.2. The H/D ratio by this shot had come up to over 10%, so there may be some room for improvement on that score as well. Between shot ECDC was not employed in this run, and probably should have been. We had one strange power system problem on shot #12. EF1U stopped following its command and bounced off its voltage rails several times around .7-.8 sec, leading to a disruption (although the shot was likely to disrupt anyway due to a J4 injection). The supply actually resumed following command after 0.8 sec. Cochran adjusted the phase reference voltage variac, which seems to have been slightly out of position; the problem did not recur. Scorecard: ---------- Tests 1 (no power cycle only) Duds 0 Fizzles 1 Plasmas 17 ------- -- Shots 19

Session Leader Comments
Oct 6 2000 09:23:48:093AM	1001006001	Steve Wukitch	001 request: Bt~5.2 T, Ip~0.8 MA, upper null D-port 1.3 MW 1.2-1.45 sec E-port 1.3 MW 0.6-0.85 sec J-port 1.3 MW 0.9-1.15 sec plasma - upper null, good comparison shot D-port 1.3 MW 1.2-1.45 sec E-port 1.3 MW 0.6-0.85 sec J-port 1.3 MW 0.9-1.15 sec one fault on #3 next shot: 2 MW pulses from J and D+E
Oct 6 2000 09:46:42:717AM	1001006002	Steve Wukitch	002 request: Bt~5.2 T, Ip~0.8 MA, upper null D-port 1. MW 1.1-1.45 sec E-port 1. MW 1.1-1.45 sec J-port 2 MW 0.6-1. sec plasma - upper null, early disruption ~0.7 sec D-port 0 MW 1.1-1.45 sec E-port 0 MW 1.1-1.45 sec J-port 1.6 MW before #3 screen xbarred antenna then ran as a monopole and injected junk which killed the plasma
Oct 6 2000 10:55:22:763AM	1001006003	Steve Wukitch	003 request: Bt~5.2 T, Ip~0.8 MA, upper null D-port 1. MW 1.1-1.45 sec E-port 1. MW 1.1-1.45 sec J-port 2 MW 0.6-1. sec plasma - upper null, early disruption ~0.7 sec D-port 0 MW 1.1-1.45 sec E-port 0 MW 1.1-1.45 sec J-port 0.8 MW #3 was faulted by false fault indication antenna ran as a monopole and injected junk which killed the plasma remove attempted combined fault indicator for J-port
Oct 6 2000 12:02:22:077PM	1001006005	Steve Wukitch	005 request: Bt~5.2 T, Ip~0.8 MA, upper null D-port 1. MW 1.1-1.45 sec E-port 1. MW 1.1-1.45 sec J-port 2 MW 0.6-1. sec plasma - upper null, early disruption ~0.7 sec D-port 0 MW 1.1-1.45 sec E-port 0 MW 1.1-1.45 sec J-port 2 MW until #4 faulted and #3 screen xbarred
Oct 6 2000 12:02:40:450PM	1001006006	Steve Wukitch	006 request: Bt~5.2 T, Ip~0.8 MA, upper null D-port 1. MW 1.1-1.45 sec E-port 1. MW 1.1-1.45 sec J-port 2 MW 0.6-1. sec plasma - upper null, early disruption ~0.7 sec D-port 0 MW 1.1-1.45 sec E-port 0 MW 1.1-1.45 sec J-port 2 MW until #3 & #4 faulted and #3 screen xbarred
Oct 6 2000 12:30:48:437PM	1001006008	Steve Wukitch	008 request: Bt~5.2 T, Ip~0.8 MA, upper null D-port 1. MW 1.1-1.45 sec E-port 1. MW 1.1-1.45 sec J-port 2 MW 0.6-1. sec plasma - upper null, H-mode with D and E @2 MW D-port 1 MW 1.1-1.45 sec E-port 1 MW 1.1-1.45 sec J-port 2 MW 0.6-1.0 sec need to retune next shot: inner wall limited
Oct 6 2000 12:52:01:670PM	1001006009	Steve Wukitch	009 request: Bt~5.2 T, Ip~0.8 MA, inner wall limited D-port 1.25 MW 1.1-1.45 sec E-port 1.25 MW 1.1-1.45 sec J-port 2.5 MW 0.6-1. sec plasma - inner wall limited, early disruption D-port 0 MW 1.1-1.45 sec E-port 0 MW 1.1-1.45 sec J-port MW 0.6-1.0 sec #3 screen xbarred on fault early gap was 2 cm good for loading check as function of gap
Oct 6 2000 02:14:46:420PM	1001006010	Steve Wukitch	shot 010 request: Bt~5.2 T, Ip~0.8 MA, inner wall limited D-port 1.25 MW 1.1-1.45 sec E-port 1.25 MW 1.1-1.45 sec J-port 2.5 MW 0.6-1. sec plasma - inner wall limited, early disruption D-port 0 MW 1.1-1.45 sec E-port 0 MW 1.1-1.45 sec J-port 1ishMW 4 alone, lots of junk 0.6-1.0 sec #3 screen xbarred on fault early gap was 1 cm good for loading check as function of gap -
Oct 6 2000 02:01:34:327PM	1001006011	Steve Wukitch	shot 011 D, 1 trip, DC0, good tune E, 3 trips, DC0 , good tune J3 screen crowbar after ~150 msec J4 5 trips, all DC0 next shot slowed down the ramp, increased filtering on crowbar circuit (#3)

Physics Operator Comments
Oct 6 2000 07:08:23:060AM		Steve Wolfe	Coldstart at 7:06. all matrices respond, no errors.
Oct 6 2000 09:18:54:200AM	1001006001	Steve Wolfe	shot#1: Continuing from last shot yesterday, 1001005011 Note that seg 3 is active segment, upper null plasma The startup from this one was shaky, I think Br was too negative, but today is a new day anyway, so leave it and see what happens. plasma, full length. 3 heating pulses, injection at start of 3rd (D) at 1.24sec. trip on J after 1sec, recovers. Heating looks good on all at 1.3-1.4MW. The gf now occurs at t=0 to 12.7msec, +15Amps on OH2L gf 0-50msec on "bank closest to control room", -15A (1.5V) Voltage on resistor stays up for 100's of msec, the pearsons are both saturating. It looks like it now has a hard ground failure. breakdown is a tad late, and Br is about .5mT negative, but leave it until it fails.
Oct 6 2000 09:41:14:920AM	1001006002	Steve Wolfe	shot#2: repeat, with higher RF power. Pearsons have been moved; no cap was found to have a dc short. Pearson previously labeled "close to alternator" is now on the prime suspect, the cap closest to the control room. plasma, disrupts at .71sec, during J-port pulse (order was switched.) J3 fulted, and J4 kept going, powering 2 straps in- phase. The single suspect cap, the one on the end, shows 15A of ground current. J'accuse! Engineers will take it out of the circuit.
Oct 6 2000 10:32:58:450AM	1001006003	Steve Wolfe	shot#3: bad cap has been removed, comm bank voltage will be raised to try to compensate; a spare cap is being prepared. Shot will be a repeat. plasma, disrupts at .81, but had an injection earlier. J3 didn't come on, J4 ran; it looks like the fix didn't work. No ground faults.
Oct 6 2000 10:53:45:420AM	1001006004	Steve Wolfe	shot#4:NO power shot; forgot to turn charging suplies back on.
Oct 6 2000 11:06:33:013AM	1001006005	Steve Wolfe	shot#5: repeat of shot#3. J-port fault chain still not set up. plasma, disrupted at .865, looks like #3. J3 screen crowbar fault.
Oct 6 2000 11:42:08:890AM	1001006006	Steve Wolfe	shot#6: replace screen crowbar unit on J3, and try it again. plasma disrupted at 1.0sec, injections start around 0.9. Again, both J3 and J4 fault at .88, but J4 comes back on.
Oct 6 2000 12:10:33:200PM	1001006007	Steve Wolfe	shot#7: retune J3 and try again. Screen crowbars are apparently "real" fizzle. probably the disruptions got us, but I may as well do something. We blew a filament on IGT; now down to two good filaments.
Oct 6 2000 12:23:45:077PM	1001006008	Steve Wolfe	shot#8: Br0 offset from .001 to .0015; Pg4 from 24msec to 22msec plasma, full length. H-mode at 1.28sec. Got J3=0.8, J4=1.2MW, L-mode; Dand E at 1 each and gets into H-mode, upper null!
Oct 6 2000 12:46:10:043PM	1001006009	Steve Wolfe	shot#9: Go to an inner limiter discharge, to really keep it in L-mode Switch to seg2, clearin from .005 -> -.018, rcur from .659->.649, change TF current to 146600. Also, lower nl4 to 8e19, as in seg3. plasma disrupted at 0.89 sec, outer gap was 18mm. next shot: reduce outer gap by 8mm
Oct 6 2000 01:16:32:340PM	1001006010	Steve Wolfe	shot#10: rcur from .649->.653. Reduce pg3 maint level to 10V. plasma, disrupted at .97; injections start around .8. Gap around 10mm. J3 faulted again. They think the stub tuner isn't really moving when they try to tune it.
Oct 6 2000 01:53:17:547PM	1001006011	Steve Wolfe	shot#11: repeat. plasma, full length but saw an injection. J3 still getting screen crowbars. D&E put in some gas at 2.5MW, but they heat
Oct 6 2000 02:05:12:640PM	1001006012	Steve Wolfe	shot#12: repeat, plasma, disrupts at .76. Same thing. EF1U hits a voltage rail at .73sec, looks like it isn't following its hybrid command
Oct 6 2000 02:35:27:170PM	1001006013	Steve Wolfe	shot#13: Cochran adjusted a variac on the EF1U supply. plasma disrupts at .89sec j3 faulted again. EF1U looks ok.
Oct 6 2000 02:57:20:327PM	1001006014	Steve Wolfe	shot#14: J3 has had major surgery on the screen crowbar unit. plasma, full length. Injection at 1sec, both J3 and J4 faulting, this time J3 stays on longer. D drops to half power and continues.
Oct 6 2000 03:23:07:763PM	1001006015	Steve Wolfe	shot#15: Repeat. plasma, full length, no injection j4 faulted early, j3 stays on. D&E at 1MW each.
Oct 6 2000 03:48:57:623PM	1001006016	Steve Wolfe	shot#16: Go to a lower null. crashed pcs, have to restart copy shot 8, change to seg 2, copy tf and pg3 voltage traces, drop the density to 8e19. plasma, full length, eda h-mode with D&E, J3 faults and recovers, J4 runs at .8MW. outer gap is ~12.5mm next shot: reduce gap to 10mm
Oct 6 2000 03:50:11:107PM	1001006016	Steve Wolfe	shot#16: Go to a lower null. crashed pcs, have to restart copy shot 8, change to seg 2, copy tf and pg3 voltage traces, drop the density to 8e19. plasma, full length, eda h-mode with D&E, J3 faults and recovers, J4 runs at .8MW. outer gap is ~12.5mm next shot: reduce gap to 9-10mm
Oct 6 2000 04:12:24:937PM	1001006017	Steve Wolfe	shot#17: reduce gap to 9-10mm (rcur->.661) Before the shot EF1L type 1 fault, conduction failure. Reset and reclosed the breaker while in INIT, plasma, full length, H-modes. No RF faults. 2 h-modes with J, one with D&E, better heating from D,E but they had more power. next shot: overlap them
Oct 6 2000 04:41:23:340PM	1001006018	Steve Wolfe	shot#18: Try to overlap J with D&E. plasma full length, lots of h-modes. Short four-way overlap, but J3 and J4 are alternating faults. outer gap is shrinking toward the end of the shot. There was a CLEARIN point at -.005 at 1.5sec, should have been +.005. next shot: Fix the CLEARIN program
Oct 6 2000 05:08:47:140PM	1001006019	Steve Wolfe	shot#19: correct CLEARIN program from 1.0 to 1.5. Rf is retuning. plasma full length, but some injections. Neuts to 1.5e13, looks like some good overlap. 120kJ 4.5MW, for nearly 200msec EDA. J4 faulting more than J3, D&E faulting some too.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:02:49:090AM	Plasma	Ok
2	09:33:27:123AM	Plasma	Ok
3	10:27:41:700AM	Plasma	Ok
4	10:52:29:500AM	Plasma	Bad	No Power - Spellmans not powered up
5	11:03:14:170AM	Plasma	Ok
6	11:35:11:843AM	Plasma	Ok
7	11:56:06:000AM	Plasma	Ok
8	12:15:57:937PM	Plasma	Ok
9	12:39:31:700PM	Plasma	Ok
10	01:06:22:560PM	Plasma	Ok
11	01:31:10:530PM	Plasma	Ok
12	01:54:43:857PM	Plasma	Bad	EF1U not following Hybrid Command
13	02:27:50:700PM	Plasma	Ok
14	02:51:35:047PM	Plasma	Ok
15	03:19:02:890PM	Plasma	Ok
16	03:43:25:733PM	Plasma	Ok
17	04:07:57:967PM	Plasma	Ok
18	04:33:30:730PM	Plasma	Ok
19	04:58:55:843PM	Plasma	Ok