Miniproposals

Miniproposal: 068a Date Filed: 11/28/1994 Title: Effect of plasma outer gap on divertor characteristics First Author: Bruce Lipschultz Session Leader: Bruce Lipschultz (shots 1-32)

Engineering Operator Run Comment

outer gap effects

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:11:710PM

Author: To Be Determined

Run of 941213 Physics Operator - J. Goetz Session Leader - B. Lipschultz Engineering - V. Bartolino MP# 68A: Effect of plasma outer gap on divetor characteristics Mini-proposal 68A is considered accomplished. We were able to vary the gap over the range desired and obtained all the required data. The loading resistance v as predicted; increasing by about a factor of 2 (from 5 - 10 ohms) as the outer gap was reduced from 2.1 cm to 0.5 cm. The effects on the outer divertor were less clear. The domed probe #9 located at ~ 1.2 cm in rho was unaffected even when the outer gap was reduced to 0.5 cm. On the other hand, the inner divertor showed an increase in current as the gap was reduced. So at first glance, the divertor parameters were relatively unaffected by the change in gap. We still need to look at things like radiated power and neutral pressure. There were some additional things to note about this run: (1) H-mode dithering shots were achieved when the RF power was turned up - shots 27 & 28. At each sawtooth crash the H-alpha @ H-port would go into oscillation for a short period. The ISAT currents at the outer divertor plate private flux region correlate almost exactly with the H-alpha. There is similar behaviour at the inner divertor except the common flux region ISats oscillate before the private flux regions. (2) We finally achieved divertor detachment without an impurity injection. This required raising nebar above 2.0e20 which is much higher than the previous 2 run periods (threshold was more like 1.3e20). The transition was much less abrupt in these examples of detachment (shots 29-32). We did see the characteristics of localized detachment in shots 29 (no RF) and 32 (RF-reattachment). (3) The antenna loading was very high (30 ohms) at the highest densities (shot 32). This was at the larger outer gap of 1.8 - 1.9 cm. The shot summary/comments follow: shot 1: power supply test shot2: disrupt at 420 ms. The density and kappa both were high (2e20, 1.8) shot 3: This went the full length. Nebar ~ 1.7e20. Outer gap was fine (2cm) with the inner gap a little too small. shot 6: gaps fine; 2.15 cm outside, 1.5 at inside. shot 7: The probe went in this shot. However, Brian felt that we should repeat it because the probes is 'still cleaning up'. Also, the RF power was low for some reason. shot 8: Repeat of shot 7 but the RF didn't fire. We will continue the program by reducing the outer gap (reducing plasma current center radius). shot 9: Outer gap reduced to 1.9-2 cm over most of the shot. It is smaller at the earliest times before the probe insertion time (.6 seconds). John Rice is going to increase the Ar on the next shot by 50% to get more signal. shot 10: All went well for the probe and RF. Next shot we will reduce the gap by ~ 2mm. John R. has again requested an increase in the Ar puff to get his signal. He only obtained a 25% increase in signal from a 50% increase in plenum pressure. I have acquiesed (sp?) in that the radiated power seems unaffected by the previous increase. shot 11: fizzle shot 12: fine with outer gap of 1.5 cm. Probe will go in the next shot. shot 13: All went fine with RF and probe with this gap. The probe seemed to get additional triggers during the second scan which caused it not to pull back in the ususal way. It hesitated on the way out. The outer divertor strike points were very constant in position. shot 14: The gap is in the range 1.1 - 1.35 cm. This is acceptable given the rest of the conditions are good. The Ar will be off the next shot to see if there is residual Ar affecting the penetration measurements. Francesca reports that the penetration efficiency for Ar has been varying; increasing as the gap is decreased. shot 15: The probe and RF were fine. The gap varied from 1. cm to 1.25 cm over the course of the shot. We will try to keep the outer gap more constant at ~ .9 to 1 cm for the next shot with no probe scan. The radiated power (2pi) dropped by 1/3 with the Ar off. We will reinstate the Ar for the next shot but with a shorter puff. shot 16: EF supply problem and plasma disrupted at .6 sec. Repeat again without probe scan shot 17: This shot didn't disrupt. However the position (outer gap and strike points) is varying too much. We will try again before doing the probe insertion shot. shot 18: The position seems more constant this shot - .7 cm outer gap. The strike points seem pretty good too. No probe insertion this shot. We will have on the next. shot 19: Another probelem with EF1, the plasma disrupted. Try again shot 20: This shot was fine but the probe was not enabled so will do it again. shot 21: The probe went, this is fine for .7 - .8 outer gap. shot 22: Gap is good at ~ 0.5 mm. We will replay this shot with probe insertion. shot 23: All went well with RF and probe insertion. Outer gap of 0.5 cm again. Next shot change outer gap to ~ 1.75 cm. shot 24: We are back to an outer gap of 1.75 cm. Probe will be inserted the next shot. shot 25: This ends the scan in gaps. We will now stay at this gap and change the RF power programming. The first and second pulses have been ~ 10kW and 500kW respectively. These will now be changed to 0.5 and 1.0 MW respectively. The probe will not be inserted the next shot while we tune up the position of the x-point. shot 26: The x-point position looks better. The probe will go in the next shot. The RF power was 0.5 MW and 1.0 MW. shot 27: 1.0 and 1.7 MW RF with a good probe scan. We will repeat at slightly higher power. On looking back at this shot it appears that at these high RF powers the plasma is dithering around H-mode. G has pointed out that the oscillations on the H-alpha correlate with the sawtooth crash. An added twist to this is that I noticed that the H-alpha (H-port) oscillations look just like the oscillations on Isat in the private flux region of the outer divertor. shot 28: 1.0 and 1.8 MW pulses of RF. Good probe scan through SOL. Next shot we will leave the RF power at low levels and try to see how high we can raise the density. The plasma current will be ramped up 50 kA during the of .5 - 1.0 sec. shot 29: Nebar increased to 2. e20. ramping during the current 'flattop'. We will try and make the density as constant as possible the next shot - the probe will fire and the RF power will be in the usual 2 steps - 10kW and 0.5 MW. shot 30: This is significantly different. Although nebar is not much higher (2.4e20) it appears that the divertor plasma is going in and out of detachment. The evidence is that all the probes in the outer divertor below the nose have Isat currents which are oscilating over about a 100 ms time scale. When the Isats in the divertor decrease, nebar increases in the main plasma. The RF faulted on this shot. For the next shot we will increase the density further. shot 31: Definite detachment on this shot! Nebar ~ 2.3 e20 when the current on probes 1-7 in th divertor (outer) drop. We then increased nebar to 2.8e20 before the end of the shot. No RF power. shot 32: We kept the density the same and tried to put RF power in. The loading resistance was enormous (30 ohms) but only 400 kW was put in. This was enough to nudge the divertor plasma towards reattachment; The Isat currents increased every time the RF power was stepped up.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:52:503PM

Author: To Be Determined

Physics operator summary for 941219 EO: Bertilino PO: Goetz SL: Lipschultz Run 941219 was in support of Mini-Proposal #068A - Effect of outer gap on divertor characteristics. The goal of this mini-proposal is to determine the minimum gap between the separatrix and the antenna required to obtain the best divertor operation. Program for this run: Vary the outer gap from 2.0 to 0.6 cm in 0.2 cm steps two RF pulses per shot - one low power, one high power ( >0.5MW) Insert fast-scanning probe (FSP) into the SOL during each RF pulse This goal was accomplished and then some. A scan of outer gap was done, from 0.4cm to 1.9cm. The preliminary results will be summarized in the session leader's summary. A power scan at fixed gap and a density scan were also performed at the same gap. Some things discovered today: 1) Work on the ramp-down segment still needs to be performed. Moving both the x-points further away from the plasma seemed to help get the current almost all the way down. At the higher densities, shark fins were the norm. The density was just too high for the given current. 2) Some attention needs to be payed to the x-point and gap controllers. Ramping the drawn waveform will help to hold the gaps and positions constant through the shot. 3) The machine ran well today. Helium ECDC was performed over the weekend as was deuterium ECDC. Recovery from all disruptions was seen. After the two EF1 disruptions, hard x-rays were measured on the succeeding shots. One fizzle was had today for no apparent reason. Engineering today: EF1L had two comm. faults today. Both led to disruptions during the shot. Otherwise, a good day. Scorecard: 32 shots = 30 plasmas + 1 fizzles + 1 p.s. test Shot summary for Run 941219 Reload of 941206025 Changes to shot 941206025: copy segment 1 from 941216024 (use startup changes from last week) Rename NL_07 to NL_04 and draw 1.0e20 add I gain to CLEARIN = 0.5 at 0.05sec RCUR offset = 10000. in segment 2 Shot change result ____ _____ ______ 1 OH stack test shot - o.k. 2 P_0 = 1.5e-5 plasma - disr. at 0.41 kappa>1.8 delta>0.6 3 RCUR = .66 plasma - disr. at 0.2MA kappa=1.6; outer=2.5 inner=1.5 4 NL_04=9e19 with break @ .825 plasma - disr @ 1.31sec raise CLEARIN I gain to 2 no change in inner gap outer=2.5cm; kappa=1.6 5 RCUR=.665 plasma - disr. @ 1.29sec outer=1.6cm; inner=1.5->1.0 6 enable B_SIDE_LOWER plasma - disr @ 1.43 RCUR=.6625; CLEARIN=-.005 outer=2.2; inner=1.5; kappa=1.6 ZXU and ZXL constant during rampdown 7 CLEARIN=-.004 plasma 2.3PSIA in B_SIDE_LOWER and one outer=2.2; inner=1.5; kappa=1.6 pulse on PG1 fire FSP 8 PG1=90Vx.024sec plasma - disr. @ 1.29 ZXU and ZXL ramp out during rampdown outer=2.1 inner=1.5 kappa=1.63 move RXL out by .005 during flattop no RF fire FSP 9 RCUR=.664 (start gap scan) plasma - disr @ 1.3 PG1=90Vx.034sec outer=1.9 inner=1.5 kappa=1.62 RXL=-.006 10 2.7PSIA in B_SIDE_LOWER plasma - disr. @ 1.37 fire FSP outer=1.9 inner=1.5 kappa=1.62 11 NL_04 break @ 0.9sec fizzle - everything looks o.k. CLEARIN=-.003 and RCUR=.667 3.9PSIA in B_SIDE_LOWER yank ZXU and ZXL out harder during ramp 12 no changes plasma - disr. @ 1.32 outer=1.5 inner=1.5 kappa=1.61 13 RXL=-.01 (after ramp) fire FSP plasma - disr @ 1.25 outer=1.5 inner=1.5 kappa=1.60 14 RXL=-.012 (after ramp) plasma - disr. @ 1.27 RCUR=.6685 and CLEARIN=-.002 outer=1.1->1.3 inner=1.5 15 disable B_SIDE_LOWER plasma - disr. @ 1.15 yank in CLEARIN and RCUR outer=1.0->1.3 inner=1.5 16 turn on P gain on ZXU plasma - disr. @ 0.7 undo CLEARIN and RCUR yank EF1L comm. fault @ 0.55 enable B_SIDE_LOWER and PG1=90Vx.026sec crowbar @ 0.6 RCUR=.67 after 0.7sec 17 RCUR = 0.67 @ 0.5sec plasma - disr @ 1.33 outer=0.8->1.2 inner=1.5 18 RXL=-.006 plasma - disr @ 1.4 RCUR=0.671 @ 0.7sec outer=0.7 inner=1.5 kappa=1.57 19 no changes plasma - disr @ 0.31 EF1L comm fault @ 0.20 20 no changes plasma - disr. @ 1.45 outer=0.75 inner=1.5 kappa=1.57 21 no changes plasma - disr. @ 1.45 outer=0.75 inner=1.5 kappa=1.57 22 RCUR=.6725 and RXL=-.005 plasma - disr. @ 1.4 outer=0.5 inner=1.5 kappa=1.56 23 RXL=-.007 and fire FSP plasma - disr. @ 1.4 outer=0.5 inner=1.5 kappa=1.56 24 RCUR=.6655 plasma - disr. @ 1.43 outer=1.75 inner=1.5 kappa=1.61 25 no changes plasma - disr. @ 1.43 outer=1.75 inner=1.5 kappa=1.62 26 RXL=-.095 plasma - disr. @ 1.46 Prf=1.0MW RF two steps - 0.5 & 1.0 MW outer=1.8 inner=1.5 kappa=1.61 27 more RF plasma - disr. @1.46 Prf=1.5MW outer=1.8 inner=1.5 kappa=1.61 28 more RF plasma - disr. @1.45 Prf=1.75 outer=1.75 inner=1.5 kappa=1.61 29 ramp Ip to -850000 plasma - disr. @ 1.33 ramp NL_04 to 1.35e20 outer=1.75 inner=1.5 kappa=1.61 no RF power 30 NL_04=1.5e20 and hold gain on plasma - disr. @ 1.3 until 1.5sec outer=1.9 inner=1.5 kappa=1.63 31 NL_04=1.75e20 plasma - disr. @ 1.27 outer=1.9->2.1 inner=1.5->1.7 32 no changes plasma - disr. @ 1.28 outer=1.8->2.0 inner=1.5->1.7

Session Leader Comments
Dec 19 1994 08:32:21:810AM		Bruce Lipschultz	Run of 941213 Physics Operator - J. Goetz Session Leader - B. Lipschultz Engineering - V. Bartolino MP# 68A: Effect of plasma outer gap on divetor characteristics The approach for these studies is to vary the outer gap and observe the effect on both RF coupling and divertor characteristics (temperature, density, profile shapes, divertor detachment) of these changes. For each gap value the characteristics of the SOL and divertor will be measured at low and high RF power. We will vary the gap by 2 mm from 2 cm to 0.6 cm. There will be 2 shots for each gap value. The first shot will allow the determination of the separatrix location needed for insertion of the fast-scanning probe on the second shot. The fast-scanning probe will be inserted twice during the shot; once during a 200-300 ms long low-power RF pulse, once during a 200-300 ms high RF pulse ($\ge 500$ kW). The magnetic equilibrium should be as close to identical as possible at the 2 probe insertion yimes. The density will be fixed during the shot such that the plasma is attached before the RF.
Dec 19 1994 08:48:29:470AM	941219002	Bruce Lipschultz	shot 2: The density screamed upto 2.e20 and the plasma disrupted at 420 ms. The main cause was probably the kappa being about 1.8
Dec 19 1994 10:08:31:770AM	941219006	Bruce Lipschultz	shot 6: This looks fine; outer gap 2.15 cm, inner gap 1.5 cm. We will start the mp using this shot. 6 will be the baseline, on #7 Brian will insert the probe on the next shot.
Dec 19 1994 10:17:27:270AM	941219007	Bruce Lipschultz	shot 7: Brian felt that the probe may still be cleaning up. We will repeat this shot. Also the RF power dropped to .4 MW for some unknown reason.
Dec 19 1994 10:39:30:970AM	941219008	Bruce Lipschultz	shot 8: Probe went in fine but the RF didn't fire. The RF faulted and didn't fire. We will continue the program by reducing the outer gap.
Dec 19 1994 10:57:58:140AM	941219009	Bruce Lipschultz	shot 9: The outer gap was reduced to ~ 1.9 cm and the shot went fine. No probe insertions, this shot will be used to determine the insertion depth for shot 10.
Dec 19 1994 11:12:34:120AM	941219010	Bruce Lipschultz	shot 10: All went well for the probe and RF. Next shot we will reduce the gap by ~ 2mm. John R. has again requested an increase in the Ar puff to get his signal. He only obtained a 25% increase in signal from a 50% increase in plenum pressure. I have acquiesed (sp?) in that the radiated power seems unaffected by the previous increase.
Dec 19 1994 11:59:25:130AM	941219013	Bruce Lipschultz	shot 13: all went well for this shot. Probe and RF fired and the outer gap was 1.4-1.5 cm.
Dec 19 1994 12:21:05:420PM	941219014	Bruce Lipschultz	shot 14: The gap is in the range 1.1 - 1.35 cm. This is acceptable given the rest of the conditions are good. The Ar will be off the next shot. No probe insertion this shot (just a test into the nether regions of the plasma. The probe will fire on the next shot.
Dec 19 1994 12:33:18:480PM	941219015	Bruce Lipschultz	shot 15: The probe and RF were fine. The gap varied from 1. cm to 1.25 cm over the course of the shot. We will try to keep the outer gap more constant at ~ .9 to 1 cm for the next shot with no probe scan. The radiated power (2pi) dropped by 1/3 with the Ar off. We will reinstate the Ar for the next shot but with a shorter puff.
Dec 19 1994 12:51:55:580PM	941219016	Bruce Lipschultz	shot 16: EF supply problem and plasma disrupted at .6 sec. Repeat again without probe scan
Dec 19 1994 01:21:15:520PM	941219018	Bruce Lipschultz	shot 18: The position seems more constant this shot - .7 cm outer gap. The strike points seem pretty good too. No probe insertion this shot. We will have on the next.
Dec 19 1994 01:29:25:830PM	941219019	Bruce Lipschultz	shot 19: Another probelem with EF1, the plasma disrupted. Try again.
Dec 19 1994 01:56:39:150PM	941219020	Bruce Lipschultz	shot 20: This shot was fine but the probe was not enabled so will do it again.
Dec 19 1994 01:58:09:590PM	941219021	Bruce Lipschultz	shot 21: The probe went, this is fine for .7 - .8 outer gap. We will reduce the gap to ~ .6 cm next shot.
Dec 19 1994 02:19:22:680PM	941219022	Bruce Lipschultz	shot 22: Gap is good at ~ 0.5 mm. We will replay this shot with probe insertion.
Dec 19 1994 02:39:22:650PM	941219023	Bruce Lipschultz	shot 23: All went well with RF and probe insertion. Outer gap of 0.5 cm again. Next shot change outer gap to ~ 1.75 cm.
Dec 19 1994 02:54:43:660PM	941219024	Bruce Lipschultz	shot 24: We are back to an outer gap of 1.75 cm. Probe will be inserted the next shot.
Dec 19 1994 03:13:38:650PM	941219025	Bruce Lipschultz	shot 25: This ends the scan in gaps. We will now stay at this gap and change the RF power programming. The first and second pulses have been ~ 10kW and 500kW respectively. These will now be changed to 0.5 and 1.0 MW respectively. The probe will not be inserted the next shot while we tune up the position of the x-point.
Dec 19 1994 03:29:37:810PM	941219026	Bruce Lipschultz	shot 26: The x-point position looks better. The probe will go in the next shot. The RF power was 0.5 MW and 1.0 MW.
Dec 19 1994 03:55:41:580PM	941219027	Bruce Lipschultz	shot 27: 1.0 and 1.7 MW pulses of RF. Good probe scan through SOL.
Dec 19 1994 03:59:49:120PM	941219028	Bruce Lipschultz	shot 28: 1.0 and 1.8 MW pulses of RF. Good probe scan through SOL. Next shot we will leave the RF power at low levels and try to see how high we can raise the density. The plasma current will be ramped up 50 kA during the of .5 - 1.0 sec.
Dec 19 1994 04:18:45:300PM	941219029	Bruce Lipschultz	shot 29: Nebar increased to 2. e20. ramping during the current 'flattop'. We will try and make the density as constant as possible the next shot - the probe will fire and the RF power will be in the usual 2 steps - 10kW and 0.5 MW.
Dec 19 1994 04:39:48:640PM	941219030	Bruce Lipschultz	shot 30: This is significantly different. Although nebar is not much higher (2.4e20) it appears that the divertor plasma is going in and out of detachment. The evidence is that all the probes in the outer divertor below the nose have Isat currents which are oscilating over about a 100 ms time scale. When the Isats in the divertor decrease, nebar increases in the main plasma. The RF faulted on this shot. For the next shot we will increase the density further.
Dec 19 1994 05:18:01:320PM	941219030	Bruce Lipschultz	shot 30: This is significantly different. Although nebar is not much higher (2.4e20) it appears that the divertor plasma is going in and out of detachment. The evidence is that all the probes in the outer divertor below the nose have Isat currents which are oscilating over about a 100 ms time scale. When the Isats in the divertor decrease, nebar increases in the main plasma. The RF faulted on this shot. For the next shot we will increase the density further.
Dec 19 1994 05:22:53:190PM	941219032	Bruce Lipschultz	shot 32: We kept the density the same and tried to put RF power in. The loading resistance was enormous (30 ohms) but only 400 kW was put in. This was enough to nudge the divertor plasma towards reattachemnt; The Isat currents increased every time the RF power was stepped up.

Physics Operator Comments
Dec 19 1994 08:22:54:600AM		John Goetz	Run 941219 is in support of Mini-Proposal 068A - Effect of outer gap on divertor characteristics. This run will hopefully determine the minimum gap between the separatrix and the antenna required to obtain the best divertor operation. Program for the run: Start from 941206025 Vary the outer gap from 2.0 to 0.6 cm in 0.2 cm steps Two RF pulses per shot - one low power, one high power ( >0.5MW) Insert fast-scanning probe (FSP) into the SOL during each pulse Changes: Load segment 1 from 941216024 - try and use the breakdown stuff learned over the week of 941212 change name of wire NL_07 to NL_04 in segment 2 and draw 1e20 add I gain of 0.5 to CLEARIN wire add offset of 10000 to RCUR in segment 2 change Ip rampdown rate
Dec 19 1994 08:28:40:930AM	941219001	John Goetz	Shot 941219001: OH stack test shot - 10kA under PLC control
Dec 19 1994 08:52:27:350AM	941219002	John Goetz	Shot 941219002: Plasma - disrupts at 0.41sec when kappa becomes > 1.8 density varying wildly triangularities of > 0.6 For Shot 941219003: draw RCUR = 0.66 CLEARIN = -.01 NL_04=7.5e19 and stairstep on gain for NL_04
Dec 19 1994 09:04:35:870AM	941219003	John Goetz	Shot 941219003: Plasma - disrupts at 0.2MA outer gap = 2.0cm; inner gap=1.5->1.0 cm; kappa=1.6 For Shot 941219004: NL_04=9e19; break point @ 0.825sec raise CLEAIN I gain to 2 in steps
Dec 19 1994 09:24:27:650AM	941219004	John Goetz	Shot 941219004: Plasma - disrupts @ 1.31 outer gap = 2.5cm; inner gap=1.5->1.0 cm; kappa=1.6 nl_04=1.0e20 For Shot 941219005: RCUR = .665 (close up the outer gap)
Dec 19 1994 09:51:47:200AM	941219005	John Goetz	Shot 941219005: Plasma - disrupts @ 1.29 outer gap = 1.6cm; inner gap=1.5->1.0 cm; kappa=1.6 nl_04=0.94e20 For Shot 941219006: RCUR = .6625 (more outer gap) ramp CLEARIN to -.005 (to hold inner gap) ZXU and ZXL drawn flat during rampdown enable B_SIDE_LOWER (for Ar)
Dec 19 1994 10:07:45:800AM	941219006	John Goetz	Shot 941219006: Plasma - disrupts @ 1.43sec outer gap = 2.2cm; inner gap=1.5cm; kappa=1.6 nl_04=0.95e20 For Shot 941219007: CLEARIN=-.004 one pulse on PG1 and 2.35PSIA in B_SIDE_LOWER
Dec 19 1994 10:24:38:130AM	941219007	John Goetz	Shot 941219007: Plasma - disrupts @ 1.43sec outer gap = 2.2cm; inner gap=1.5cm; kappa=1.6 nl_04=0.95e20 For Shot 941219008: PG1 = 90V x .024sec ZXU and ZXL ramp out during rampdown ramp RXL out by .005 during shot
Dec 19 1994 10:40:15:050AM	941219008	John Goetz	Shot 941219008: Plasma - disrupts @ 1.29sec outer gap = 2.1cm; inner gap=1.5cm; kappa=1.63 For Shot 941219009: PG1 = 90V x .034sec RCUR=.664 remove ZXU and ZXL changes from 008 RXL=-.006
Dec 19 1994 10:55:25:260AM	941219009	John Goetz	Shot 941219009: Plasma - disrupts @ 1.3sec outer gap = 1.9cm; inner gap=1.5->1.4cm; kappa=1.62 For Shot 941219010: 2.7PSIA in B_SIDE_LOWER fire FSP
Dec 19 1994 11:11:53:160AM	941219010	John Goetz	Shot 9412190010: Plasma - disrupts @ 1.37sec outer gap = 1.9cm; inner gap=1.5->1.4cm; kappa=1.62 For Shot 941219011: 3.9PSIA in B_SIDE_LOWER yank ZXU and RXU out harder during rampdown NL_04 break @ 0.9sec CLEARIN=-.003 and RCUR=.667
Dec 19 1994 11:29:41:820AM	941219011	John Goetz	Shot 9412190011: Fizzle - everything looks fine For Shot 941219012: no changes
Dec 19 1994 11:48:16:030AM	941219012	John Goetz	Shot 9412190012: Plasma - disr. @ 1.32 kappa=1.61; inner=1.5; outer=1.5 For Shot 941219013: RXL=-.01 (after ramp) fire FSP
Dec 19 1994 12:00:04:560PM	941219013	John Goetz	Shot 9412190013: Plasma - disr. @ 1.25 kappa=1.60; inner=1.5; outer=1.5 For Shot 941219014: RXL=-.012 (after ramp) RCUR=.6685 and CLEARIN=-.002 (after ramp)
Dec 19 1994 12:20:00:700PM	941219014	John Goetz	Shot 9412190014: Plasma - disr. @ 1.27 kappa=1.60; inner=1.5; outer=1.1->1.3 For Shot 941219015: disable B_SIDE_LOWER yank in CLEARIN and RCUR during rampdown
Dec 19 1994 12:32:55:440PM	941219015	John Goetz	Shot 9412190015: Plasma - disr. @ 1.15 kappa=1.60; inner=1.5; outer=1.0->1.3 For Shot 941219016: enable B_SIDE_LOWER and PG1=90Vx.026sec remove yank in CLEARIN and RCUR during rampdown turn on P gain (=2) on ZXU during rampdown RCUR=.67 from 0.7 on
Dec 19 1994 12:52:57:940PM	941219016	John Goetz	Shot 9412190016: Plasma - disr. @ 0.7 EF1L comm fault at 0.55 - crowbar at 0.6 For Shot 941219017: RCUR=0.67 @ 0.5sec
Dec 19 1994 01:08:41:020PM	941219017	John Goetz	Shot 9412190017: Plasma - disr. @ 1.33 outer=0.8->1.2 inner=1.5 kappa=1.58 For Shot 941219018: RCUR=0.671 @ 0.7sec ( try and stop the outer gap growth) RXL=-.006 (RXL was moving last shot)
Dec 19 1994 01:20:12:880PM	941219018	John Goetz	Shot 9412190018: Plasma - disr. @ 1.4 outer=0.7 inner=1.5 kappa=1.57 For Shot 941219019: fire FSP
Dec 19 1994 01:33:32:950PM	941219019	John Goetz	Shot 9412190019: Plasma - disr. @ 0.31 EF1L comm. fault @ 0.2 For Shot 941219020: fire FSP
Dec 19 1994 01:46:41:850PM	941219020	John Goetz	Shot 9412190020: Plasma - disr. @ 1.45 outer=0.75->0.8 inner=1.5 kappa=1.57 no FSP For Shot 941219021: fire FSP
Dec 19 1994 02:00:28:650PM	941219021	John Goetz	Shot 9412190021: Plasma - disr. @ 1.45 outer=0.75->0.8 inner=1.5 kappa=1.57 For Shot 941219022: RCUR=0.6725 (smaller gap yet) RXL=-.005
Dec 19 1994 02:19:36:800PM	941219022	John Goetz	Shot 9412190022: Plasma - disr. @ 1.4 outer=0.5 inner=1.5 kappa=1.56 For Shot 941219023: RXL=-.007 (after ramp) to try to hold constant fire FSP
Dec 19 1994 02:35:22:630PM	941219023	John Goetz	Shot 9412190023: Plasma - disr. @ 1.41 outer=0.5 inner=1.5 kappa=1.56 For Shot 941219024: RCUR=.6655 (try to get outer=1.7)
Dec 19 1994 02:54:55:330PM	941219024	John Goetz	Shot 9412190024: Plasma - disr. @ 1.43 outer=1.75 inner=1.5 kappa=1.61 For Shot 941219025: fire FSP
Dec 19 1994 03:11:16:660PM	941219025	John Goetz	Shot 9412190025: Plasma - disr. @ 1.43 outer=1.75 inner=1.5 kappa=1.62 For Shot 941219026: RXL=-.095 at end of ramp (to hold x-point more constant)
Dec 19 1994 03:27:01:170PM	941219026	John Goetz	Shot 9412190026: Plasma - disr. @ 1.46 outer=1.8 inner=1.5 kappa=1.61 For Shot 941219027: fire FSP
Dec 19 1994 03:41:54:540PM	941219027	John Goetz	Shot 9412190027: Plasma - disr. @ 1.46 outer=1.8 inner=1.5 kappa=1.61 Prf=1.5MW For Shot 941219028: more RF power
Dec 19 1994 03:58:50:670PM	941219028	John Goetz	Shot 9412190028: Plasma - disr. @ 1.45 outer=1.75 inner=1.5 kappa=1.61 Prf=1.75MW For Shot 941219029: ramp Ip to -850000 ramp NL_04 to 1.35e20 no RF power
Dec 19 1994 04:16:58:920PM	941219029	John Goetz	Shot 9412190029: Plasma - disr. @ 1.33 outer=1.75 inner=1.5 kappa=1.61 For Shot 941219030: NL_04=1.5e20 (no ramp) and hold gain on until 1.5sec
Dec 19 1994 04:34:14:010PM	941219030	John Goetz	Shot 941219030: Plasma - disr. @ 1.3 outer=1.9 inner=1.5 kappa=1.63 For Shot 941219031: NL_04=1.75e20 (no ramp)
Dec 19 1994 04:47:34:420PM	941219031	John Goetz	Shot 941219031: Plasma - disr. @ 1.27 outer=1.9->2.1 inner=1.5->1.7 kappa=1.62->1.65 For Shot 941219032: no changes
Dec 19 1994 05:03:54:080PM	941219032	John Goetz	Shot 941219032: Plasma - disr. @ 1.28 outer=1.8->2.0 inner=1.5->1.7 kappa=1.61->1.65

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:22:29:350AM	Test	Ok	oh coax test
2	08:36:23:650AM	Plasma	Ok	no faults
3	08:49:31:440AM	Plasma	Ok	no faults
4	09:12:13:970AM	Plasma	Ok	no faults
5	09:29:07:000AM	Plasma	Ok	disruption induced comm faults oh2u and oh1
6	09:51:22:250AM	Plasma	Ok	no faults
7	10:07:40:800AM	Plasma	Ok	no faults
8	10:26:00:890AM	Plasma	Ok	disruption induced comm faults oh2l oh1
9	10:42:36:960AM	Plasma	Ok	disruption induced comm faults
10	10:58:06:320AM	Plasma	Ok	no faults
11	11:16:59:540AM	Plasma	Ok	no faults
12	11:30:40:470AM	Plasma	Ok	no faults
13	11:45:10:750AM	Plasma	Ok	no faults
14	12:03:45:740PM	Plasma	Ok	no faults
15	12:19:26:900PM	Plasma	Ok	disruption induced comm faults- oh1 and oh2l
16	12:36:38:030PM	Plasma	Bad	ef1l comm fault, then oh1 comm fault
17	12:52:22:110PM	Plasma	Bad	ef4 fault 1 - d and e breaker pulled
18	01:08:45:150PM	Plasma	Ok	no faults
19	01:22:09:620PM	Plasma	Bad	ef1l comm fault killed plasma
20	01:35:46:690PM	Plasma	Ok	no faults
21	01:50:47:740PM	Plasma	Ok	no faults
22	02:07:25:060PM	Plasma	Ok	no faults
23	02:22:05:810PM	Plasma	Ok	no faults
24	02:40:16:010PM	Plasma	Ok	no faults
25	02:59:14:500PM	Plasma	Ok	no faults
26	03:15:19:130PM	Plasma	Ok	no faults
27	03:31:28:010PM	Plasma	Ok	no faults
28	03:48:29:180PM	Plasma	Ok	no faults
29	04:03:58:800PM	Plasma	Ok	no faults
30	04:20:35:840PM	Plasma	Ok	no faults
31	04:35:58:600PM	Plasma	Ok	no faults
32	04:52:40:960PM	Plasma	Ok	no faults