Miniproposals

Miniproposal: 105 Date Filed: 3/24/1995 Title: Dependence of Detachment Threshold and Radial Extent on Plasma Current & q First Author: Bruce Lipschultz Session Leader: Bruce Lipschultz (shots 1-29)

Engineering Operator Run Comment

Wolfe

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:13:680PM

Author: To Be Determined

Run 950509 Engineering operator: V. Bertolino Physics operator: S. Wolfe Session leader: BLip M.P.# 105: Effect of current and q on divertor characteristics This m. p. has 2 parts: First we plan to study the detachment characterisitics of plasmas at 1 MA . For the second half of the mp we will be varying q. Today we addressed the first part of this mp. We ran 1 MA shots first with vertical plate and then with flat-plate equilibria. The first 1/2 of the run was spent trying to implement a new inner strike point controller - STRKIN. This was successful (after alot of shots) in the sense that the controller did what it was supposed to. However, this control was incompatible with the location of the x-point; the plasma dropped down to 'sit' on the divertor plates. We gave up on STRKIN control and switched back to a combination of STRKPSI and RXL. This eventually worked and we went back up to 1 MA (shot 15) and proceeded with a density scan with the vertical plate equilibria. Starting at nl04=1.45e20 (shot 19) we saw detachment start. As the density was increased over the next several shots the detachment appeared to extend further up the divertor plate. The verification will have to await the analysis with of the FSP data. At nl04=1.85e20 we did appear to be detached up through probe 7. The highest density reached with vertical plate was 2.1e20. For that shot (22) it is possible that even probe 8 was detached. In summary the threshold for death ray appearance is higher than at 800 kA (1.45e20 vs 1.1-1.2e20 for 800kA). The process of detachment also seems different at 1 MA in that the pressure drop edge moved up the divertor face over a range in density ( 1MA) as opposed to the whole vertical face of the divertor immediately after the death ray disappears. We then dropped back to 800 kA for shot 23 with flat-plate divertor equilibria. Shots 24-27 were flat-plate at 1 MA. We achieved densities of 1.0, 1.4 and 1.8 (which disrupted and ended the run). We did not observe any detachment on these shots. Unfortunately the separatrix sweep at nl04=1.8e20 was interrupted by the disruption and so we do not know whether detachment was occurring. A summary of shots follows: shot 1: power supply test shot 2: 800 kA, nl04 = 8.5e19. Right gap and SSEP a little small. shot 3: nl04=8e19. SSEP better (1.5 or so). Strike point down aroung probe 4 and drifting. shot 4: nl04= 8e19. Strike point on probe 3. 800 kA. shot 5: no change other than strike point on probe 2 now. Unfortunately, x-point riding on inner nose. shot 6: same but better x-point control. Next shot to 1 MA. shot 7: try for 1 MA failed, disruption at .37 seconds. shot 8: nl04= .8e20, 1MA. Still having problems with x-point position. shot 9: nl04=0.7e20, 1 MA. Disruption at 1.1 sec shot 10: disruption shot 11: disruption shot 12: 800 kA again to regroup and try again, lots of injections. shot 13: same, still tuning shot 14: still tuning shot 15: 1 MA, 7e19 on nl04. shot 16: Disruption at 1.1 seconds. nl04 = .7e20, FSP scan ok. shot 17: nl04=1.15e20. FSP scan to within 2 mm of separatrix. shot 18: nl04=1.25e20, FSP scan ok. Not detached. shot 19: nl04=1.45e20 (rises to 1.55 after .9 seconds). There does appear to be detachment at probes 4 & 5 of the outer divertor that shot along with a death ray on probe 4. shot 20: nl04 = 1.55-1.7 e20. FSP scan ok. Detachment again on probes 4 & 5 but no further up the plate! shot 21: nl04 = 1.85 e20. FSP scan ok. Detachment again on probes 4 -6 + possibly probe 7 (but we don't have a domed probe there). shot 22: nl04= 2.1e20. FSP scan ok. detached up through, I think, probes 7 & 8. The decision about probe 8 will have to await the FSP analysis. shot 23: 800 kA Flat-plate divertor loaded in from last week (950503018). nl04=1.0e20. shot 24: 1 MA, nl04=1.e20, no FSP scan. shot 25: 1 MA flat-plate. nl04=1.0e20. FSP scan. shot 26: nl04=1.4e20, FSP scan ok, no evidence of detachment. shot 27: STRIKE OUT! flat-plate out. We had a BIG disruption. shot 28: He3 pulse for Yuichi, 800 kA, nl04=0.7e20.

Physics Operator Summaries

Entered: Jul 7 2004 04:36:54:160PM

Author: To Be Determined

Physics Operator Summary for 950509 MP#105 Divertor Detachment (1MA) SL: BLIP PO: Wolfe EO: Bertolino/Daigle The goal of this run was to get ohmic detachment data at 1MA for vertical plate and "flat plate" configurations. I didn't expect to get through the whole program, and as it happened we didn't. This was partly because I wasted too much time at the beginning of the run trying to get a non-overdetermined control using STRKPSI and STRKIN. This actually worked, but for the strikepoint at probe 2, this control ended up with the x-point very low. We eventually went back to a STRKPSI,RXL,ZXL control scheme, which worked well enough. To my surprise, we actually got to the flatplate part of the run. For this we used the same basic scheme as Ian had last Wednesday; this worked fine until we pushed the density to high (NL_04=1.8e20) and got a Halo **OUT** on shot 27 (270kA halo current). The probable cause was OH2L voltage railing at 65Volts. These plasmas may just not be possible with the present supplies. It would probably be worthwhile to see if there is any room left to adjust the margin angles on the OH2 supplies. In view of the short time remaining, there was no way to back off and try another approach, even if I could have thought of one. Therefore, I reloaded an earlier low-density 800kA shot and let Yuichi try out the He3 puff for tomorrow on the last 2 shots. The detailed plan for today was: (-1) Engineering setup as for 950505012, except delay TF start to -1.0 sec. A-side plenum filled to 20psi of D2. ECDC in D2. (0) Start with Segment 1 from Friday, and Segment 2 a clone of 950502019, an 800kA shot with the desired characteristics: strike point in probe 2-3 area, SSEP > 1.6cm, inner and outer gaps > 1.8cm. Initial changes to 950502019: NL_04 changed from 1.5e20 to .7e20, delay RXL ramp from .95sec to 1.05sec. Try to get a robust looking shot with NL_04=0.7e20, and the above gaps and strikes, preferably with ZCUR between 0 and -1cm, but don't push too hard on that. Things to try: Increase IC_EF4 program to 2500A; Adjust RXL,ZXL gains to reduce over-determination of controllers; eliminate RXL,ZXL control entirely and use STRKIN; keep an eye on EF2's and perhaps adjust CLEARIN ramp to keep them off the rail early; watch for voltage saturations and current railings; tweak up the ramp-down to try to eliminate disruptions without RF. (1) When satisfied with the 800kA shot, go up to 1 MA . Check the EF2's and EF3 ramp. Consider delaying the crowbar times to get more current early. (2) After the shot is set up and Brian has a FSP scan at nl04=0.7 we will raise the density in steps of 0.2 until death ray has come and gone (6 - 10 shots depending if Brian needs extra shots). Then go back and fill in density scan through death ray range in density (2 more shots). (3) Starting where we left off density scan increase density in 0.4 steps to maximum. Use either NINJA or B-side LOWER valve to get to high density, if needed; note - WE WILL NOT BE USING ARGON in this run. (2 -3 shots). (4) Convert to flat plate scan of last Wednesday but at 1 MA. Start at nl04=0.7 (5 shots?). It may make sense to lengthen the shot to achieve the return scan across probe 8 properly. (5) Step up density in 0.4 steps to maximum (5-8 shots depending on FSP needs). (6) Fill in density in steps of 0.2 around detachment start ( if any). What actually happened was: --------------------------- Shot 1 was the usual Tuesday morning test Shot 2-6 were spent tuning up the STRKIN/STRKPSI control at 800kA Shot 7-10 were at 1.0MA with STRKIN/STRKPSI. It didn't work very well, with several disruptions in early rampdown and moving targets for the FSP. The main problem was that the x-point was forced very low, close to the floor, late in the shot. Shot 11 went back to RXL/STRKPSI control at 1MA; this disrupted in flattop with a bad VDE and EF2's and EF4 all on their rails. Fortunately the disruption went up, and halo current was small. Shot 12-14 were back at 800kA, tuning up RXL/ZXL/STRPSI control. I ended up with RXL on wire 9 with P=36/sec, I=50/sec^2; STRKPSI on wire 12 with the controller calculated orthogonal to STRKIN (full rank) and P=85/s,I=142/s^2; ZXL on wire 6 with P=10/s.This combination allowed the RXL to fight the STRKSPI, so typically we had good RXL position amd STRKPSI near probe 4, rather than probe 2. We probably could have used STRKIN/STRKPSI if we had been willing to program STRPSI for probe 4 in the first place, but BLIP's standards became looser as the day wore on (and on and on and ...) Shot 15-22 were a density scan at 1MA. Full detachment was obtained at NL_04=2.1e20 on shot 22. B-side LOWER valve was used for additional D2 puff, since B-side Upper has He3 in it. On shot 20, Joe moved the margin angle on the EF1 supplies from 20 to 18, to try to get more voltage, as #19 had both EF1's in saturation; this seemed to help. There may be more safe room on this adjustment. Shot 23 went back to 800kA to set up the flatplate shots. Loaded seg 2 from 950503018 and raised ZCUR by 1cm. This ran well. Shot 24-27 were a flatplate density scan at 1MA. 24-26 ran well, although voltage was rising as we increased density, as expected. On 25 the reverse sweep was increased so the separatrix went back across probe 8 at the end of the sshot. Shot 27 disrupted hard around .84sec, giving a halo current **OUT** at 270kA. This terminated the flatplate run. Shot 28-29 reloaded shot 13, with the ZCUR ramp slowed down to help rampdown. Enable He3 puff from B-side upper: shot 28 4psi, 350msec wide puff; shot 29 18.5psi, 200msec wide puff. Shot 28 the He3 was visible to spectroscopists, but not on density feedback. Shot 29 the density doubled and shut off the A-side valve. Presumably Yuichi will want something in between for tomorrow. General comments: ----------------- The -1.0sec start time on the TF worked fine, and probably would have gotten us a couple of extra shots due to reduced cooling time if we hadn't had to wait for the TF scanner every shot. The scanner was the dominant delay today. Startup was reliable all day, even after killer disruptions. I have no ideal why. I was using the same Segment 1 as last Friday's run. We got several ohmic H-modes, and more that were dithering. Shot 3 is a good early example. See the logbook entries for more. The voltage limits on EF1 and OH2's are still a problem. We were running at slightly reduced alternator voltage today, as we have been since last Thursday, but this is probably not the main problem. Scorecard: ---------- Tests 1 Duds 0 Fizzles 0 Plasmas 28 (1warning, 1 **OUT**) ------- -- Total 29

Session Leader Comments
May 9 1995 08:23:21:340AM		Bruce Lipschultz	Run 950509 Engineering operator: V. Bertolino Physics operator: S. Wolfe Session leader: BLip M.P.# 105: Effect of current and q on divertor characteristics This m. p. has 2 parts: First we plan to study the detachment characterisitics of plasmas at 1 MA (today's run). For the second half of the mp we will be varying q. The order of today's run is to obtain a 1 MA plasam with outer strike point in the region of probes 2 & 3. From shot to shot scan the density up through a maximum value. Take some extra shots around the 'death ray' occurence densities. We will then attempt to switch to flat-plate divertor equilibrium and repeat the density scan.
May 9 1995 09:08:08:890AM	950509002	Bruce Lipschultz	shot 2: 800 kA, nl04 = 8.5e19. Right gap and SSEP a little small.
May 9 1995 09:11:28:880AM	950509002	Bruce Lipschultz	shot 2: 800 kA, nl04 = 8.5e19. Right gap and SSEP a little small.
May 9 1995 09:19:09:480AM	950509003	Bruce Lipschultz	shot 3: nl04=8e19. SSEP better (1.5 or so). Strike point down aroung probe 4 and drifting.
May 9 1995 09:35:16:460AM	950509003	Bruce Lipschultz	shot 3: nl04=8e19. SSEP better (1.5 or so). Strike point down aroung probe 4 and drifting.
May 9 1995 09:35:57:160AM	950509004	Bruce Lipschultz	shot 4: nl04= 8e19. Strike point on probe 3. 800 kA.
May 9 1995 10:03:05:080AM	950509005	Bruce Lipschultz	shot 5: no change other than strike point on probe 2 now.
May 9 1995 10:03:40:650AM	950509005	Bruce Lipschultz	shot 5: no change other than strike point on probe 2 now.
May 9 1995 10:18:17:890AM	950509006	Bruce Lipschultz	shot 6: same but better x-point control. Next shot to 1 MA.
May 9 1995 10:30:14:940AM	950509007	Bruce Lipschultz	shot 7: try for 1 MA failed, disruption at .37 seconds.
May 9 1995 10:56:40:980AM	950509008	Bruce Lipschultz	shot 8: nl04= .8e20, 1MA. Still having problems with x-point position.
May 9 1995 11:31:52:950AM	950509009	Bruce Lipschultz	shot 9: nl04=0.7e20, 1 MA. Disruption at 1.1 sec
May 9 1995 12:12:01:840PM	950509010	Bruce Lipschultz	shot 10: disruption
May 9 1995 12:12:16:940PM	950509011	Bruce Lipschultz	shot 11: disruption
May 9 1995 12:27:11:700PM	950509012	Bruce Lipschultz	shot 12: 800 kA again to regroup and try again, lots of injections.
May 9 1995 12:27:39:900PM	950509012	Bruce Lipschultz	shot 12: 800 kA again to regroup and try again, lots of injections.
May 9 1995 12:45:57:610PM	950509012	Bruce Lipschultz	shot 12: 800 kA again to regroup and try again, lots of injections.
May 9 1995 12:46:19:540PM	950509013	Bruce Lipschultz	shot 13: same, still tuning
May 9 1995 01:15:05:070PM	950509014	Bruce Lipschultz	shot 14: still tuning
May 9 1995 01:16:32:850PM	950509015	Bruce Lipschultz	shot 15: 1 MA, 7e19 on nl04.
May 9 1995 01:35:30:180PM	950509016	Bruce Lipschultz	shot 16: Disruption at 1.1 seconds. nl04 = .7e20, FSP scan ok.
May 9 1995 01:45:31:450PM	950509017	Bruce Lipschultz	shot 17: nl04=1.15e20. FSP scan to within 2 mm of separatrix.
May 9 1995 02:02:41:850PM	950509018	Bruce Lipschultz	shot 18: nl04=1.25e20, FSP scan ok. Not detached.
May 9 1995 02:27:22:160PM	950509019	Bruce Lipschultz	shot 19: nl04=1.45e20 (rises to 1.55 after .9 seconds). There does appear to be detachment at probes 4 & 5 of the outer divertor that shot along with a death ray on probe 4.
May 9 1995 02:51:52:270PM	950509020	Bruce Lipschultz	shot 20: nl04 = 1.55-1.7 e20. FSP scan ok. Detachment again on probes 4 & 5 but no further up the plate!
May 9 1995 03:02:47:720PM	950509020	Bruce Lipschultz	shot 20: nl04 = 1.55-1.7 e20. FSP scan ok. Detachment again on probes 4 & 5 but no further up the plate!
May 9 1995 03:05:04:880PM	950509021	Bruce Lipschultz	shot 21: nl04 = 1.85 e20. FSP scan ok. Detachment again on probes 4 -6 + possibly probe 7 (but we don't have a domed probe there).
May 9 1995 03:06:21:220PM	950509021	Bruce Lipschultz	shot 21: nl04 = 1.85 e20. FSP scan ok. Detachment again on probes 4 -6 + possibly probe 7 (but we don't have a domed probe there).
May 9 1995 03:18:04:230PM	950509022	Bruce Lipschultz	shot 22: nl04= 2.1e20. FSP scan ok. detached up through, I think, probes 7 & 8. The decision about probe 8 will have to await the FSP analysis.
May 9 1995 03:29:54:070PM	950509023	Bruce Lipschultz	shot 23: 800 kA Flat-plate divertor loaded in from last week (950503018). nl04=1.0e20.
May 9 1995 03:31:57:120PM	950509023	Bruce Lipschultz	shot 23: 800 kA Flat-plate divertor loaded in from last week (950503018). nl04=1.0e20.
May 9 1995 04:05:39:200PM	950509025	Bruce Lipschultz	shot 25: 1 MA flat-plate. nl04=1.0e20. FSP scan.
May 9 1995 04:41:18:310PM	950509026	Bruce Lipschultz	shot 26: nl04=1.4e20, FSP scan ok, no evidence of detachment.
May 9 1995 04:42:32:300PM	950509027	Bruce Lipschultz	shot 27: STRIKE OUT! flat-plate out. We had a BIG disruption.
May 9 1995 04:47:37:790PM	950509027	Bruce Lipschultz	shot 27: STRIKE OUT! flat-plate out. We had a BIG disruption.
May 9 1995 04:49:35:490PM	950509028	Bruce Lipschultz	shot 28: He3 pulse for Yuichi, 800 kA, nl04=0.7e20.

Physics Operator Comments
May 9 1995 07:20:35:440AM		Steve Wolfe	MP#105 Divertor Detachment (1MA) SL: BLIP PO: Wolfe EO: Bertolino (-1) Engineering setup as for 950505012, except delay TF start to -1.0 sec. A-side plenum filled to 20psi of D2. ECDC in D2. (0) Start with Segment 1 from Friday, and Segment 2 a clone of 950502019, an 800kA shot with the desired characteristics: strike point in probe 2-3 area, SSEP > 1.6cm, inner and outer gaps > 1.8cm. Initial changes to 950502019: NL_04 changed from 1.5e20 to .7e20, delay RXL ramp from .95sec to 1.05sec. Try to get a robust looking shot with NL_04=0.7e20, and the above gaps and strikes, preferably with ZCUR between 0 and -1cm, but don't push too hard on that. Things to try: Increase IC_EF4 program to 2500A; Adjust RXL,ZXL gains to reduce over-determination of controllers; eliminate RXL,ZXL control entirely and use STRKIN; keep an eye on EF2's and perhaps adjust CLEARIN ramp to keep them off the rail early; watch for voltage saturations and current railings; tweak up the ramp-down to try to eliminate disruptions without RF.
May 9 1995 07:21:30:520AM		Steve Wolfe	(1) When satisfied with the 800kA shot, go up to 1 MA . Check the EF2's and EF3 ramp. Consider delaying the crowbar times to get more current early. (2) After the shot is set up and Brian has a FSP scan at nl04=0.7 we will raise the density in steps of 0.2 until death ray has come and gone (6 - 10 shots depending if Brian needs extra shots). Then go back and fill in density scan through death ray range in density (2 more shots). (3) Starting where we left off density scan increase density in 0.4 steps to maximum. Use either NINJA or B-side LOWER valve to get to high density, if needed; note - WE WILL NOT BE USING ARGON in this run. (2 -3 shots). (4) Convert to flat plate scan of last Wednesday but at 1 MA. Start at nl04=0.7 (5 shots?). It may make sense to lengthen the shot to achieve the return scan across probe 8 properly. (5) Step up density in 0.4 steps to maximum (5-8 shots depending on FSP needs). (6) Fill in density in steps of 0.2 around detachment start ( if any).
May 9 1995 07:22:08:920AM		Steve Wolfe	Coldstart done at 07:15. First shot will be usual Tuesday OH test
May 9 1995 07:46:36:820AM		Steve Wolfe	Coldstart done at 07:15. Additional change Loaded at 7:43: Extend CLEARIN to 1.05 sec
May 9 1995 08:38:23:050AM	950509001	Steve Wolfe	Shot 950509001 Tuesday morning test looks ok
May 9 1995 08:57:15:300AM	950509002	Steve Wolfe	Shot 950509002 First plasma attempt. Fill at 2.0e-5 Plasma - runs full length. Some Mo injections. Gaps look good, SSEP only 1cm though
May 9 1995 09:11:11:720AM	950509003	Steve Wolfe	Shot 950509003 Increase ZXU gain from 3 to 6 to try to improve SSEP. Plasma runs full length. H-mode at .83sec. SSEP is better. Outer gap still a bit small late.
May 9 1995 09:35:58:800AM	950509004	Steve Wolfe	Shot 950509004 Try using STRKIN control STRKIN on wire 11 with gain=20/sec @.350 sec STRKPSI on wire 12 with ALL including STRKIN, P=85/sec,I=142 RXL gain down to 20/sec ZXL gain down to zero Plasma - Full length. Dithering from about .7, H-mode at 1.09sec STRKIN is a little high, error around 1000. BLIP says STRKPSI is moving about a mm during flattop (rho space)
May 9 1995 09:53:49:620AM	950509005	Steve Wolfe	Shot 950509005 Continue using STRKIN control STRKIN gain to 20/sec =5 hybrid (was actually only 8/s last time) STRKPSI on wire 12 with ALL including STRKIN, P=85/sec,I=142 Change programming from +.0006,.0004 to 0. after .586 sec RXL gain down to zero ZXL gain down to zero Plasma - Disrupted a little earlier, EF2's have a big thrash early from .3 to .6. That's not good.
May 9 1995 10:11:54:050AM	950509006	Steve Wolfe	Shot 950509006 Turn STRKIN on at before .1sec, I=1 at .54s Plasma - disrupted earlier, 1.3sec EF2's better, STRKIN somewhat better. Still dithering H-mode.
May 9 1995 10:33:06:480AM	950509007	Steve Wolfe	Shot 950509007 INcrease I gain on STRKIN to 2, turn off both at 1.2sec Increase Ip to 1.0MA Increase IC_EF4 to 2200a Dirupted early, around crossover? Only gets to 600kA 2pi bolo starts up 315msec, disruption around 369 The only change at that time is the IC_EF4
May 9 1995 10:53:30:030AM	950509008	Steve Wolfe	Shot 950509008 Leave old IC_EF4 program until 400msec, then raise to 2000a at .6sec Disrupted in ramp-down (1.15sec)
May 9 1995 11:10:40:180AM	950509009	Steve Wolfe	Shot 950509009 Lower NL_04 to 6.5e19 (from 7.5e19) Chnage STRKIN to -.002 Leave ZXU high in rampdown Slow down CLEARIN rampdown Still disrupting; this one at 1.06sec, just at EOF. This looks like a VDE.
May 9 1995 11:40:37:590AM	950509010	Steve Wolfe	Shot 950509010 No changes in Flattop, try to fix up rampdown Put ZXU programming back Extend ZCUR flat till after 1.08 Extend STRKPSI to 1.05 Leave IC_EF4 gain low through rampdown Disrupted early, at 0.91 sec Halo warning.
May 9 1995 11:58:13:710AM	950509011	Steve Wolfe	Shot 950509011 Give up on STRKIN for now, go back to RXL only as on original shot Still disrupting. Bad VDE at .85. EF2's both railed throughout! And EF4 is also at max current. Don't do that again. ZXL is very negative. Inner strike is on the EF1 shelf the whole time Back to 800kA, try to tune up the overdetermined system.
May 9 1995 12:16:14:190PM	950509012	Steve Wolfe	Shot 950509012 Back to 800kA. Tuning up the over-determined case: Bring in ZXL control as on 950502 Reduce RXL gain to 20/sec. Plasma - ran through to 1.46 EF2's look happy. Lots of Mo injections RXL too far inside?
May 9 1995 12:37:08:750PM	950509013	Steve Wolfe	Shot 950509013 Increase RXL gain to 36/s at .5 sec, back down in rampdown Plasma - ran till 1.4sec EF2's still ok. Still several injections. Looks like another late H-mode. RXL still inside, but better.
May 9 1995 12:48:33:250PM	950509014	Steve Wolfe	Shot 950509014 Move RXL to wire 9, and turn on Integral gain at 50/sec2, between .58 and 1.05 Plasma - disrupts a little earlier (1.33) EF2L ok, EF2U around 3000A Still lots of injections. RXL steady at about -10000 error
May 9 1995 01:11:35:380PM	950509015	Steve Wolfe	Shot 950509015 Back to 1MA. No other changes. (Turn off shit shooter for this one) Made it through to about 1.2sec EF2U touches the rail at .56sec No H-mode. FSP target is moving down
May 9 1995 01:24:00:980PM	950509016	Steve Wolfe	Shot 950509016 Extend STRKPSI control to EOF Slow down current ramp to try to fix EF2 rail Brian will fire the FSP on this shot. Didn't last as long, disrupts at 1.1sec EF2U is off the rail but close the whole shot.
May 9 1995 01:42:23:250PM	950509017	Steve Wolfe	Shot 950509017 Raise NL_04 to 1.1e20 Plasma - Lasted to 1.3sec Dithering the whole shot. Gaps a bit small, especially outside.
May 9 1995 02:00:45:140PM	950509018	Steve Wolfe	Shot 950509018 Raise NL_04 to 1.25e20 Move RCUR in by 3mm to increase right gap. Reduce peak in pre-programmed gas puff. Plasma - PF crowbar after ramp-down disruption at 1.28 Looks like a VDE in rampdown EF1U may be railing at end of flattop
May 9 1995 02:25:58:020PM	950509019	Steve Wolfe	Shot 950509019 Raise NL_04 to 1.45e20 Slow down RCUR ramp in rampdown Slow down CLEARIN ramp around .5 sec to reduce demand on EF2 early Back to recool- alternator fault Ran through to 1.35 Density starts to increase around .9 EF1U and EF1L are on the voltage rail at 200V (despite the fact EF1L got to 260 last week)
May 9 1995 02:43:26:890PM	950509020	Steve Wolfe	Shot 950509020 Try increasing margin angle on EF1 supplies Raise NL_04 to 1.65e20 Plasma - ran to 1.3sec Still getting a density rise late in flattop Got a bit more voltage on EF1's, didn't saturate
May 9 1995 03:03:31:560PM	950509021	Steve Wolfe	Shot 950509021 Purge B-side lower of Ar, fill with 20psi of D2 Enable B-side lower (pulse gas 1); Puff from 0.6 to 0.8 Raise NL_04 to 1.85e20 Program RXL to ramp in by 0.005 during flattop Plasma - lasts to 1.28sec Supplies look ok.
May 9 1995 03:15:54:110PM	950509022	Steve Wolfe	Shot 950509022 Raise NL_04 to 2.05e20 Plasma - ran to 1.33 Got 2.1e20, fully detached.
May 9 1995 03:36:45:270PM	950509023	Steve Wolfe	Shot 950509023 Go to flatplate Load Seg2 from 950503018. The damn shot is already on Optical!!! Raise ZCUR from -.015 to -.005 Plasma - ramped all the way down EF1's are pushing, but not saturated yet. EF2's look ok
May 9 1995 03:45:53:110PM	950509024	Steve Wolfe	Shot 950509024 Go to 1MA, IC_EF4 to 2000A Plasma - Made it! EF2's in good shape, EF1's look ok, although EF1L is getting up there on the reverse swing. BLIP wants to swing back further.
May 9 1995 04:02:55:600PM	950509025	Steve Wolfe	Shot 950509025 Extend STRKPSI gain to 1.1 (was turning off at 1.0) INcrease reverse sweep on STRKPSI to (1.1,-.005) Extend NL_04 program to 1.05 BLAB will fire the FSP on this shot .7,.85,1.0sec Plasma - ramps all the way down Looks like it swept ok
May 9 1995 04:15:28:390PM	950509026	Steve Wolfe	Shot 950509026 Increase NL_04 to 1.4e20 Plasma - ramps down all the way SSEP down to 1.2cm, Supplies look ok
May 9 1995 04:34:20:290PM	950509027	Steve Wolfe	Shot 950509027 Increase NL_04 to 1.8e20; enable B-side lower, puff from .6 to .85 Increase ZXU gain from 3 to 6 during flattop Disrupted in flattop at 0.84sec Halo Out. 270kA Halo current. Looks like OH2L on voltage rail?
May 9 1995 04:55:00:410PM	950509028	Steve Wolfe	Shot 950509028 Reload 950509013 (800kA, STRKSPI,RXL,ZXL control) Slow down RCUR ramp Puff He3 from .5 to .85sec Plasma - ramps all the way down No obvious sign of any Helium on Zmeter, CX, or feedback
May 9 1995 06:24:42:540PM	950509029	Steve Wolfe	Shot 950509029 Increase He3 plenum pressure on B-side upper to 19psi Shorten pulse to 200msec Jim Terry and Garry McCracken report they saw the He line on shot 28. Plasma - runs all the way down. Density ran up to 1.4e20 with the He3 pulse, then comes back down to 1.1. Feedback turned the A-side valve off

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:34:45:700AM	Test	Ok	oh coax, efc test
2	08:44:38:640AM	Plasma	Ok
3	09:02:59:220AM	Plasma	Ok
4	09:22:15:050AM	Plasma	Ok
5	09:46:34:200AM	Plasma	Ok
6	10:03:57:910AM	Plasma	Ok
7	10:21:13:150AM	Plasma	Ok
8	10:40:10:150AM	Plasma	Ok
9	11:03:45:980AM	Plasma	Ok
10	11:23:24:460AM	Plasma	Ok
11	11:47:14:350AM	Plasma	Ok
12	12:05:41:400PM	Plasma	Ok
13	12:22:22:180PM	Plasma	Ok
14	12:41:32:460PM	Plasma	Ok	No Faults.
15	12:58:38:360PM	Plasma	Ok	No Faults.
16	01:16:57:560PM	Plasma	Ok	No Faults.
17	01:32:44:310PM	Plasma	Ok	no faults.
18	01:50:13:340PM	Plasma	Ok	Comm Fault OH2l&oh1
19	02:06:45:650PM	Plasma	Ok	No Faults.
20	02:31:01:680PM	Plasma	Ok	No Faults
21	02:53:00:570PM	Plasma	Ok	No Faults.
22	03:09:08:960PM	Plasma	Ok	No faults.
23	03:24:35:670PM	Plasma	Ok	No Faults.
24	03:40:24:220PM	Plasma	Ok	No faults.
25	03:55:47:540PM	Plasma	Ok	No Faults.
26	04:10:47:200PM	Plasma	Ok	No Faults.
27	04:26:19:740PM	Plasma	Ok	oh2l type 2 fault after shot unexplained
28	04:45:39:860PM	Plasma	Ok	No Faults.
29	05:01:20:610PM	Plasma	Ok	No Faults.