Miniproposals

Miniproposal: 073a Date Filed: 1/20/1995 Title: Effect of RF heating on divertor detachment characteristics First Author: Bruce Lipschultz Session Leader: Bruce Lipschultz (shots 1-25)

Engineering Operator Run Comment

plasma run, will attempt to get data

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:12:053PM

Author: To Be Determined

Run of 950125 Physics Operator - J. Goetz Session Leader - B. Lipschultz Engineering - F. SIlva MP# 73: Effect of RF heating on divertor detachment characteristics It is important in the understanding of divertor detachment to study the dependence of the divertor radiation and detachement threshold characteristics on input power. The variation of RF power at a fixed line-averaged denstiy will allow us to vary the power into the SOL independent of plasma current and line-averaged density. The approach for these studies was to create a standard divertor detachment shot with as constant a density as possible. The RF power would be varied from shot to shot to try and reattach the plasma during the shot. This would then be repeated for different plasma densities. This run was partially successful. We were able to use the RF to affect the divertor plasma. There were increases in both density and temperature in the divertor as well as changes in the profile. In some cases the plasma did appear to be completely detached (up through probe 7) before the RF turned on. In those cases (e.g. shots 21 -22) the first RF pulse reattached most of the divertor plasma. The higher RF power had lesser effects. The primary change in divertor parameters was that the density increased. The temperature increases were more modest (2-5 or 10 eV). It seems that the plasma far from the separatrix is much easier (less power) to affect than the plasma closest to the separatrix. However even with the highest RF powers the separatrix and private flux region appear not to have reattached. Why was a large amount of RF power required to affect the divertor plasma? There does appear to be significant increases in the power flowing into the SOL - 600kW at low RF or during the ohmic phase and up to 1.2 MW in the high RF power cases. At first glance it appears that there are correspondingly large increases in the divertor radiated power. The signals on the div. bolos were the highest that I have seen. Unfortunately I don't think we can confirm these high P_SOL numbers with the fast-scanning probe due to its problems. Flourine lines at Lambda=3848 & 3851 Ang. were observed by Garry and Ben Welch using the OMA spectrograph viewing the outer divertor through the A-port (large) periscope. They were well correlated with RF power. Other lines at Lambda=3754 to 3759 Ang. (possibly OIII) were also correlated with the RF power. Ben also obtained good spectra of high-n states of D for the Balmer series n=7-13. These lines were Stark broadened with analyzed ne up to 1 x 10^21 m^-3. The view averages over the entire inclined section of the outer divertor plate. Operationally we had problems in a number of areas. The most significant problem was that the scanning probe had difficulties during the RF with being shutoff and the position sensor reading improperly. There are no obvious solutions to this problem. Initially we also had difficulties with the RF in that the D-port antenna was out of commision and the E-port antenna was very finicky. We stopped the run around shot 8 to fix the problems with the D-port antenna and from then on the RF was fairly reliable. IGOR gave us numerous problems towards the end of the run. Josh had to completely restart the logbook during this period because we went to init 3 times and had to stop each time. After the logbook was restarted the data taking went much faster. In the control area the biggest issue was the control of the x-point. As the denaity was increased the x-point drifted towards the inner divertor nose by 1 -1.5 cm effectively creating a limited plasma there. This problem will hopefully be addressed by increasing the ohmic transformer precharge. shot 1: fine, nl04 = 1.2 e 20. almost no rf power shot 2: fine, same density. We had 3 steps of RF power each ~ 150 ms long starting at .5 sec. The powers were 0, .2 and .45 MW respectively. shot 3: The outer and inner gaps are more constant now; 1.5 cm inside, 1.75 cm outside. The RF power pulses were 0, .7 and 1.3 MW respectively. nebar ~ 2.25 e20. shot 4: The plasma appears to be detached at the separatrix (probes 1-2) but attached further out. The gaps are fine but the plasma position for the scanning probe is not constant. We will go back to shot 2 equilibrium and raise the density slightly. During the 600kW RF power pulse ne increased at rho=1 mm (probe 3) and decreased at probe 4 bringing the pressure profile peak closer to the separatrix. No effect on the local Tes. shot 5: The RF did not fire. We are having problems with the gaps changing during the shot (inner gap down to 1 cm and outer gap varying). The variation in the outer gap appears to determine the movement of the separatrix for insertion of the FSP giving problems there. John will try to modify this. shot 6: The RF powers are 0, .5 and .8 MW. Things are getting close. The second and third RF pulses raise the density on probe 3 and decrease probe 4, the final density and pressure peak has moved to probe 3. Very little effect on probes 1 & 2. shot 7: The probe went in this shot. The RF looks good too.shot 7: The probe went in this shot. The RF arcs during the second rf pulse (1.5 MW) and the third pulse really doesn't go. Otherwise we got the three probe scans. Try again next shot. When the RF turns off the divertor profile relaxes back to peaking on probe 4. shot 8: RF problems - they will go in and get the D-port antenna going. shot 9: The RF went for the first pulse but failed after that. We moved the plasma up by .5 cm that shot. shot 10: Big moly injection at .72 sec from scanning probe kills the plasma. The RF power was higher than requested - .7MW for the first pulse, 1.8 MW for the second. It is possible that the increased RF power affected the equilibrium through beta and the plasma shifted out. shot 11: Very nice shot. The RF power went in all 3 steps: .1,.4,.75 MW. However, the previous disruption on the probe appears to have killed the north and south probes. Each RF pulse increases the density on probe 3. The last RF pulse also increases the density on probe 2 (separatrix or slightly private flux). shot 12: Very nice shot. Three rf pulses are .5, 1., 1.1 MW. nebar in the range 2.2-2.5 e20. The probe only went in for one scan because of an interlock tripout during the shot. The density peak moves towards the separatrix with each increase in RF power. The temperature in the divertor increases with each RF power increase. We will try again with the same thing for the next shot. shot 13: The RF power was almost constant for the shot with H-mode occuring at .84 sec. The probe only made one scan, during the first RF pulse. shot 14: The RF powers were .2, 1. and 1.4 MW with H-mode again at .84 sec. The probe again had problems. We will increase the density and move the plasma up by 1 cm for the next shot. shot 15: RF power pulses of .5,1.0 and 1.5 MW before H-mode at .85 sec. One good probe scan at .59 sec. shot 16: 3 rf pulses 1.0,1.5 and 2MW. H-mode at .82 sec which causes the rf power to drop. nebar is 2.6e20 before H-mode and 3320 after. We got one probe scan at .87 sec. shot 17: RF pulses of .5, ragged (.5-1.0) and 1.5 MW with no H-mode. The probe went in at .75 sec. nebar ~ 2.5 e20. shot 18: Best shot so far for RF power. Rf pulses of .9,1. & 1.5 MW. Probe insertion not trustworthy. Each RF pulse shifts the divertor profile. Next shot we will increase the density again. shot 19: RF PULSES OF .25,.8 AND 1.3 MW. The probe was not fired. nebar ~2.8e20. B-bottom MKS pressures of 35 mtorr. As we have increased the density the x-point has slowly moved closer to the inner divertor in order to keep Strkpsi at the correct location. Plasma is almost completely detached up through probe 7 before the RF. The first rf pulse has little effect. The second and third affect all probes down through to the private flux region. shot 20: Rf power of .3, 1. & 1.5 MW. We had a probe scan but the position trace was screwed up again. We will try to get more RF power on the next shot. The x-point was better controlled - further off the inner divertor. This one had plasma detached from the divertor up through probe 6 before the RF. During the RF the plasma reattaches back down through probe 3. Record densities on the probes of 1.5 e21 on probes 4 & 5 at various times. shot 21: RF pulses of .5, 1.8 & 1.5 MW. At .68 sec there is rearrangement of the radiation in the divertor and the plasma profile on the outer divertor plate. It appears that the plasma is completely detached before this time up through probe 7 at the outer divertor. After this time the divertor bolos have very high signals (perhaps the highest). For the next shot we will move the strike point back up the div plate slightly in the hope that the x-point will move off the inner div. plate. shot 22: still problems with the location of the x-point. It doesn't look like the plasma is properly diverted until .68 sec. We will lower the density and try for higher powers. This is similar to shot 21 in terms of detachment and reattachment. 2e21 densities on probe 4! shot 23: Lower density - nebar ~ 2.3e20 with 2 very short H-mode periods. We got 2 decent probe scans, 1 during the RF pulse. RF pulses of 1., 1.7 & 1.4 MW. Strike point is a little high - probes 4 & 5. We will try to make the density more constant and lower the strike point back down the plate to the region of probe 2. shot 24: nebar ~ 2.3e20. RF powers 0, 1. and 1.7 MW. The RF trips out when the plasma goes into H-mode and the coupling actually improves (it was tuned for H-mode apparently and the amount of power went too high). The strike point is a little high. shot 25" same density, the strike point slightly farther down the plate. The last RF power pulse (.73 sec) affects the divertor plasma with ~ 30 ms delay - both on the rise and fall of the RF power. This corr. to about an energy confinement time.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:52:957PM

Author: To Be Determined

Physics operator summary for 950125 EO: Silva/Bertilino PO: Goetz SL: Lipschultz Run 950125 was in support of Mini-Proposal #073 - Effect of RF Heating on Divertor Detachment Characteristics. The goal of this mini-proposal is to study the dependence of the divertor detachment threshold characteristics on the input power. RF power will be the tool used to vary the input power. Program for this run: - Setup a lower SN discharge with outer gap 1.5-2.0cm and achieve a detached divertor - Stairstep the RF injected power (0.4MW x .15sec) and determine the necessary power for reattachment - Perform a density scan - Repeat at Ip=0.6MA See the Session Leader's summary to find out if and how this program was carried out. Some things discovered today: 1) A very reliable day today. Twenty-five straight plasmas. With NL_04 less than or equal to 1.35e20, most of these discharges ramped down to <0.2MA using Horne's exponential decay technique. 2) With the line-density (NL_04) greater than 1.35e20, the control system begins to have problems. Radial control of the lower x-point is lost and the upper x-point begin to creep into the plasma. Most of these plasmas were riding the inner nose long after EFIT said the plasmas were diverted. The ISAT profile on the inner divertor indicated that the plasmas were still limited while the outer divertor shows a diverted discharge. Riding the plasma on the inner nose results in a large influx of carbon and deuterium. 3) In an attempt to regain control during these high density discharges, control was returned to RXL at the expense of STRKPSI, but this only seemed to help a small amount. Full control was never obtained for these plasmas. Also, these plasmas all disrupted shortly after ramp-down with Ip~0.6MA. 4) The pressure in the A_SIDE plenum needed to be increased throughout the day to help the piezo valve achieve the requested densities. So, keep an eye on the feedback scope to see if the valve is being railed. 5) Some success in keeping EF2L off the rail was achieved by slowing down the rise in CLEARIN. However, at the higher densities this was not an effective technique. Engineering, computing, and diagnostics today: No engineering problems today. The computers were slow all day long. Loading the shot into the hybrid seemed to take a long time. The INIT and STORE cycles were long today and were finally fixed by restarting the logbook (JAS). The FSP had many problems today and the RF boys struggled to keep their tune. Scorecard: 25 shots = 25 plasmas Shot summary for Run 950125 Reload of 950119023 Changes to shot 950119023: NL_04 drawn to 1.2e20 from 0.3 to 0.95 sec CLEARIN = -9.0e-3 @ 0.35 (to stop inner gap ramp) Shot change result ____ _____ ______ 1 see above plasma - disr.@1.28 - shark fin EF's on the rail 2 CLEARIN=-.011 @ 0.4; RCUR=.667 plasma - disr.@1.28 - shark fin o. gap=1.5; i. gap=1.9->1.5 RCUR=.6662; enable B_SIDE_LOWER 3 STRKPSI=-7.5e-4; CLEARIN=-1.5e-2@.45 plasma - disr.@1.26 & -2e-3@1.0 RCUR=.6662 severe shaking at crossover i.gap=1.5 o.gap=1.9 4 CLEARIN I gain=2 @ 0.4 plasma - disr @ 1.1 STRKPSI=-2.5e-4 EF2's off the rail i.gap=1.0->1.5 o.gap=1.0->2.0 5 CLEARIN=-9E-3@.45 RCUR=.6655 plasma - disr.@1.23 NL_04=1.35E20 diverts @ .5 CLEARIN change wasn't there 6 CLEARIN=-6e-3@.4245 I gain on @ .375 plasma - disr.@1.15 i.gap=1.7->1.5 o.gap=2.0->1.7->2.0 7 CLEARIN=-2e-3@.475 plasma - disr.@1.19 i.gap=1.6 o.gap=1.9 8 add 3PSIA D2 to A_SIDE plasma - disr. @ 1.26 better density feedback o.gap=2.0 i.gap=1.7->1.5 9 add 3PSIA D2 to A_SIDE; RCUR=0.667 plasma - disr. @1.25 RXL P gain=1.5; ZCUR=-.022 o.gap=2.0; i.gap=1.7; z=-.018 10 no changes plasma - disr. @.74 due to large Mo influx from FSP 11 no changes plasma - disr. @1.25sec o.gap=2.0; i.gap=1.7 12 no changes plasma - disr. @1.26 o.gap=2.0; i.gap=1.7 13 no changes plasma - disr. @1.26 o.gap=1.7; i.gap=1.7 14 no changes plasma - disr. @1.26 o.gap=1.8; i.gap=1.7 15 ZCUR=-.012; NL_04=1.5e20 plasma - disr. @1.02 caused by discont. in ZCUR across seg switch 16 ZCUR=-.012 in segment 3 and lower plasma - disr. @ 1.1 P gain on fast ZCUR wire to 1. kappa = 1.7 match STRKPSI across segments o.gap=2->1.8; i.gap=1.8 17 ZXL=0; CLEARIN=-3e-3 plasma - disr. @ 1.12 kappa=1.64 i.gap=1.5 o.gap=1.8 18 CLEARIN ramp in begin @ 0.95 plasma - disr. @ 1.12 STRKPSI P gain = 0 @ 0.95 kappa=1.63 i.gap=1.5 o.gap=1.8 19 NL_04=1.7e20 plasma - disr. @ 1.08 fueling from inner nose i.gap=1.7; o.gap=2.0 20 RXL=0 and Pgain = 2 plasma - disr. @ 1.14 i.gap=1.5; o.gap=1.8 21 RXL=+.005 and P gain =2.5 plasma - disr. @ 1.12 Mo inj. @ .37; EF2L on rail 22 delay turn on of CLEARIN; ZCUR=-.015 plasma - disr. @ 1.13 STRKPSI=+2.5e-4 i.gap=1.7->1.5; o.gap=2.2->1.8 outer strike = -50 23 NL_04=1.5e20; STRKPSI=0. plasma - disr. @ 1.21 outer strike = -51.5; RXL=55.5 i.gap=1.6; o.gap=1.8 24 add 3PSIA to A_SIDE; delay CLEARIN plasma - disr. @ 1.14 until 0.55; STRKPSI=-2.5e-4 Mo inj. @ .37 25 lower gain on RXL to 1.5 plasma - disr. @ 1.12 better on the Mo

Session Leader Comments
Jan 25 1995 08:27:21:740AM		Bruce Lipschultz	It is important in the understanding of divertor detachment to study the dependence of the divertor radiation and detachement threshold characteristics on input power. The variation of RF power at a fixed line-averaged denstiy will allow us to vary the power into the SOL independent of plasma current and line-averaged density. The approach for these studies is to create a standard divertor detachment shot with as constant a density as possible. The RF power would be varied from shot to shot to try and reattach the plasma during the shot. This would then be repeated for different plasma densities. We will start the run with a standard inclined plate equilibrium and line-averaged density of 1.7-2 x 10^20 to be close to detachment.
Jan 25 1995 09:20:31:420AM	950125002	Bruce Lipschultz	shot 2: fine, same density. We had 3 steps of RF power each ~ 150 ms long starting at .5 sec. The powers were 0, .2 and .45 MW respectively.
Jan 25 1995 09:35:00:010AM	950125003	Bruce Lipschultz	shot 3: The outer and inner gaps are more constant now; 1.5 cm inside, 1.75 cm outside. The RF power pulses were 0, .7 and 1.3 MW respectively. nebar ~ 2.25 e20.
Jan 25 1995 09:51:27:160AM	950125004	Bruce Lipschultz	shot 4: The plasma appears to be detached at the separatrix (probes 1-2) but attached further out. The gaps are fine but the plasma position for the scanning probe is not constant. We will go back to shot 2 equilibrium and raise the density slightly.
Jan 25 1995 10:04:40:740AM	950125005	Bruce Lipschultz	shot 5: The RF did not fire. We are having problems with the gaps changing during the shot (inner gap down to 1 cm and outer gap varying). The variation in the outer gap appears to determine the movement of the separatrix for insertion of the FSP giving problems there. John will try to modify this.
Jan 25 1995 10:29:52:160AM	950125006	Bruce Lipschultz	shot 6: The RF powers are 0, .5 and .8 MW. Things are getting close
Jan 25 1995 10:47:11:330AM	950125007	Bruce Lipschultz	shot 7: The probe went in this shot. The RF arcs during the second rf pulse (1.5 MW) and the third pulse really doesn't go. Otherwise we got the three probe scans. Try again next shot.
Jan 25 1995 11:29:20:880AM	950125009	Bruce Lipschultz	shot 9: The RF went for the first pulse but failed after that. We moved the plasma up by .5 cm that shot.
Jan 25 1995 11:41:43:860AM	950125010	Bruce Lipschultz	shot 10: Big moly injection at .72 sec from scanning probe kills the plasma. The RF power was higher than requested - .7MW for the first pulse, 1.8 MW for the second. It is possible that the increased RF power affected the equilibrium through beta and the plasma shifted out.
Jan 25 1995 12:17:57:040PM	950125011	Bruce Lipschultz	shot 11: The RF power went in all 3 steps: .1,.4,.75 MW. The probe went in fine as well. However, the previous disruption on the probe appears to have killed the north and south probes.
Jan 25 1995 12:20:07:950PM	950125012	Bruce Lipschultz	shot 12: Three rf pulses are .5, 1., 1.1 MW. nebar in the range 2.2-2.5 e20. The probe only went in for one scan because of an interlock tripout during the shot. We will try again with the same thing for the next shot.
Jan 25 1995 12:31:29:300PM	950125013	Bruce Lipschultz	shot 13: The RF power was almost constant for the shot with H-mode occuring at .84 sec. The probe only made one scan, during the first RF pulse.
Jan 25 1995 12:54:42:710PM	950125014	Bruce Lipschultz	shot 14: The RF powers were .2, 1. and 1.4 MW with H-mode again at .84 sec. The probe again had problems. We will increase the density and move the plasma up by 1 cm for the next shot.
Jan 25 1995 01:25:12:590PM	950125015	Bruce Lipschultz	shot 15: RF power pulses of .5,1.0 and 1.5 MW before H-mode at .85 sec. One good probe scan at .59 sec.
Jan 25 1995 01:23:37:240PM	950125016	Bruce Lipschultz	shot 16: 3 rf pulses 1.0,1.5 and 2MW. H-mode at .82 sec which causes the rf power to drop. nebar is 2.6e20 before H-mode and 3320 after. We got one probe scan at .87 sec.
Jan 25 1995 01:42:50:590PM	950125017	Bruce Lipschultz	shot 17: RF pulses of .5, ragged (.5-1.0) and 1.5 MW with no H-mode. The probe went in at .75 sec. nebar ~ 2.5 e20.
Jan 25 1995 02:30:35:330PM	950125019	Bruce Lipschultz	shot 19: RF PULSES OF .25,.8 AND 1.3 MW. The probe was not fired. nebar ~2.8e20. B-bottom MKS pressures of 35 mtorr. As we have increased the density the x-point has slowly moved closer to the inner divertor in order to keep Strkpsi at the correct location.
Jan 25 1995 02:45:45:470PM	950125020	Bruce Lipschultz	shot 20: Rf power of .3, 1. & 1.5 MW. We had a probe scan but the position trace was screwed up again. We will try to get more RF power on the next shot. The x-point was better controlled - further off the inner divertor.
Jan 25 1995 03:10:27:290PM	950125021	Bruce Lipschultz	shot 21: RF pulses of .5, 1.8 & 1.5 MW. At .68 sec there is rearrangement of t radiation in the divertor and the plasma profile on the outer divertor plate. It is not clear what this is due to. At this time the divertor bolos have very high signals (perhaps the highest). For the next shot we will move the strike point back up the div plate slightly in the hope that the x-point will move off the inner div. plate.
Jan 25 1995 03:39:37:040PM	950125022	Bruce Lipschultz	shot 22: still problems with the location of the x-point. It doesn't look like the plasma is properly diverted until .68 sec. We will lower the density and try for higher powers.
Jan 25 1995 05:20:56:910PM	950125024	Bruce Lipschultz	shot 24: nebar ~ 2.3e20. RF powers 0, 1. and 1.7 MW. The RF trips out when the plasma goes into H-mode and the coupling actually improves (it when the plasma goes into H-mode and the coupling actually improves (it was tuned for H-mode apparently and the amount of power went too high). The strike point is a little high.
Jan 25 1995 05:26:57:690PM	950125025	Bruce Lipschultz	shot 25" same density, the strike point slightly farther down the plate. The last RF power pulse (.73 sec) affects the divertor plasma with ~ 30 ms delay - both on the rise and fall of the RF power. This corr. to about an energy confinement time.

Physics Operator Comments
Jan 25 1995 08:13:38:190AM		John Goetz	Run 950125 Mini-Proposal #073 - Effect of RF Heating on Divertor Detachment Characteristics The input power will be varied to study the deteachment threshold characteristics. RF power will be the tool to vary the input power at fixed line-averaged density. Program: 1) Obtain lower SN discharge with outer gap 1.5-2.0cm and achieve a detached divertor 2) Stairstep the RF injected power (0.4MW x .15sec) and determine the necessary power for reattachment 3) Perform a density scan 4) Repeat at Ip=0.6MA Coldstart hybrid - all matrices respond Start from the equilibrium of 950119023 CLEARIN = -9.0e-3 @ .35sec (to stop inner gap ramp) NL_04 = 1.2e20 from 0.3 to 0.95 sec
Jan 25 1995 09:00:43:830AM	950125001	John Goetz	Shot 950125001 Plasma - disruption @ 1.28 - shark fin EF2's on the rail inner gap goes from 2.0->1.5; outer gap = 1.9 For 002: CLEARIN = -1.1e-2 @ 0.4 (get EF2's off the rail) RCUR = 0.667 (smaller outer gap)
Jan 25 1995 09:17:15:830AM	950125002	John Goetz	Shot 950125002 Plasma - disruption @ 1.28 - shark fin EF2's kiss the rail inner gap goes from 1.9->1.5; outer gap = 1.5 For 002: CLEARIN = -1.5e-2 @ 0.45 (get EF2's off the rail) & -2e-3 @ 1.0sec RCUR = 0.6662 (larger outer gap) STRKPSI = -7.5e-4 (get the strike point further down the plate) enable B_SIDE_LOWER
Jan 25 1995 09:34:49:210AM	950125003	John Goetz	Shot 950125003: Plasma - disruption @ 1.28 - shark fin EF2's on the rail - shaking at crossover inner gap somewhat flat @ 1.5; outer gap = 1.9 For 004: CLEARIN I gain = 2 @ 0.4 (wait until after crossover) STRKPSI = -2.5e-4 (move it back to where it was on 002)
Jan 25 1995 09:54:48:330AM	950125004	John Goetz	Shot 950125004: Plasma - disruption @ 1.1 - very quick shark fin EF2's no longer hit the rail inner gap = 1.0->1.5; outer gap = 1.0->1.9 (why? - RCUR says it is o.k. - must be an interaction between STRKPSI and RCUR) For 005: CLEARIN = 9.0e-3 @ .45 NL_04=1.35e20 RCUR=.6655
Jan 25 1995 10:26:54:510AM	950125006	John Goetz	Shot 950125006: Plasma - disruption @ 1.15 - shark fin inner gap = 1.7->1.5; outer gap = 2.0->1.7->2.0 For 007: CLEARIN = -2.0e-3 @ .475 enable FSP
Jan 25 1995 10:45:25:690AM	950125007	John Goetz	Shot 950125007: Plasma - disruption @ 1.19 - shark fin inner gap = 1.6; outer gap = 1.9 RF arcs out on second pulse For 008: add 3 PSIA of D2 to A_SIDE
Jan 25 1995 11:18:22:940AM	950125008	John Goetz	Shot 950125008: Plasma - disruption @ 1.26 - shark fin inner gap = 1.7->1.5; outer gap = 2.0 Rf trips early density feedback better For 009: add 3 PSIA of D2 to A_SIDE RXL P gain = 1.5 ZCUR = -.022 RCUR = 0.667
Jan 25 1995 11:29:21:850AM	950125009	John Goetz	Shot 950125009: Plasma - disruption @ 1.25 - shark fin inner gap = 1.7; outer gap = 2.0 For 010: no changes
Jan 25 1995 11:45:45:460AM	950125010	John Goetz	Shot 950125010: Plasma - disruption @ 0.74 - thermal collapse large moly influx @ 0.71 when FSP kisses plasma high power RF causes a 1mm change in RXL and a hotter SOL For 011: no changes
Jan 25 1995 12:05:37:190PM	950125011	John Goetz	Shot 950125011: Plasma - disruption @ 1.25 - shark fin outer gap=2.0; inner gap=1.7 For 012: no changes
Jan 25 1995 12:17:40:430PM	950125012	John Goetz	Shot 950125012: Plasma - disruption @ 1.26 - shark fin outer gap=2.0; inner gap=1.7 For 013: no changes
Jan 25 1995 12:33:14:470PM	950125013	John Goetz	Shot 950125013: Plasma - disruption @ 1.26 - shark fin outer gap=1.7; inner gap=1.7 For 014: no changes
Jan 25 1995 12:51:57:370PM	950125014	John Goetz	Shot 950125014: Plasma - disruption @ 1.26 - shark fin outer gap=1.8; inner gap=1.7 For 015: ZCUR = -.012 NL_04 = 1.5e20
Jan 25 1995 01:23:30:920PM	950125015	John Goetz	Shot 950125015: Plasma - disruption @ 1.02 - vertical instab. discontinuity in ZCUR across the segment switch For 016: ZCUR = -.012 in segment 3 lower P gain on fast ZCUR wire to 1. at segment switch match STRKPSI across segment switch
Jan 25 1995 01:25:13:380PM	950125016	John Goetz	Shot 950125016: Plasma - disruption @ 1.1 - vertical instab. kappa = 1.7 thru most of shot outer gap=2.0->1.8; inner gap = 1.8 For 017: ZXL = 0. CLEARIN = -3e-3
Jan 25 1995 01:43:40:840PM	950125017	John Goetz	Shot 950125017: Plasma - disruption @ 1.12 - vertical instab. kappa = 1.64 thru most of shot outer gap=1.8; inner gap = 1.5 For 018: CLEARIN ramp in starting @ 0.95 STRKPSI P gain =0 @ 0.95
Jan 25 1995 01:59:21:750PM	950125018	John Goetz	Shot 950125018: Plasma - disruption @ 1.12 - shark fin kappa = 1.63 thru most of shot outer gap=1.8; inner gap = 1.5 For 019: NL_04=1.7e20 and break @ 0.92sec
Jan 25 1995 02:26:08:460PM	950125019	John Goetz	Shot 950125019: Plasma - disruption @ 1.08 RXL = .54 thru the shot -> riding the inner nose fueling comes from the inner nose up until 0.5 sec For 020: RXL = 0.0 and increase P gain = 2
Jan 25 1995 02:44:07:000PM	950125020	John Goetz	Shot 950125020: Plasma - disruption @ 1.14 RXL = .55->.54 thru the shot not much riding of the inner nose For 021: RXL = +0.005 and increase P gain = 2.5
Jan 25 1995 03:09:21:420PM	950125021	John Goetz	Shot 950125021: Plasma - disruption @ 1.12 RXL = .54->.55 thru the shot back to riding the inner nose until 0.675 EF2L on the rail until 0.41 For 022: delay turn on of CLEARIN STRKPSI = +2.5e-4 ZCUR = -.015
Jan 25 1995 03:29:28:290PM	950125022	John Goetz	Shot 950125022: Plasma - disruption @ 1.13 RXL = .54->.55 thru the shot riding the inner nose until 0.65 EF2L on the rail until 0.38 (better) For 023: NL_04 = 1.5e20
Jan 25 1995 03:56:01:280PM	950125023	John Goetz	Shot 950125023: Plasma - disruption @ 1.21 RXL = 0.55 much better on nose kiss inner gap = 1.6; outer gap = 1.8 For 024: STRKPSI = -2.5E-4 add 3 PSIA to A_SIDE delay CLEARIN turn on until 0.55
Jan 25 1995 04:49:55:030PM	950125024	John Goetz	Shot 950125024: Plasma - disr. @ 1.14 moly injection @ 0.37; EF2L almost to the rail outer strike point at -51.5cm For 025: lower P gain on RXL to 1.5
Jan 25 1995 04:57:41:500PM	950125025	John Goetz	Shot 950125025: Plasma - disr. @ 1.12 better on the Mo influx EOR

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:44:13:410AM	Plasma	Ok	no faults plasma
2	09:00:41:520AM	Plasma	Ok	no faults, plasma
3	09:19:27:520AM	Plasma	Ok	no faults
4	09:34:01:360AM	Plasma	Ok	no faults, plasma
5	09:52:45:180AM	Plasma	Ok	no faults, plasma
6	10:10:48:230AM	Plasma	Ok	no faults, plasma
7	10:28:33:040AM	Plasma	Ok	no faults, plasma
8	10:47:53:900AM	Plasma	Ok	no faults, plasma
9	11:13:11:700AM	Plasma	Ok	no faults,plasma
10	11:31:13:250AM	Plasma	Ok	no faults, plasma
11	11:49:19:120AM	Plasma	Ok	no faults plasma
12	12:03:23:880PM	Plasma	Ok	no faults, plasma
13	12:19:50:580PM	Plasma	Ok	no faults, plasma
14	12:36:57:150PM	Plasma	Ok	no faults, plasma
15	12:54:12:750PM	Plasma	Ok	no faults, plasma
16	01:09:15:270PM	Plasma	Ok	no faults
17	01:28:16:580PM	Plasma	Ok	disruption induced comm faults oh2l, oh1
18	01:45:38:340PM	Plasma	Ok	no faults
19	02:07:39:040PM	Plasma	Ok	disruption induced comm faults oh1, oh2u and ef1u
20	02:28:45:550PM	Plasma	Ok	no faults
21	02:50:17:440PM	Plasma	Ok	no faults
22	03:16:42:570PM	Plasma	Ok	no faults
23	03:40:44:550PM	Plasma	Ok	no faults
24	04:35:01:510PM	Plasma	Bad
25	04:51:39:610PM	Plasma	Ok	no faults