| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Brian Labombard |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Joe Daigle,Vinny Bertolino, Unknown |
| Engineering Operator Run Comment |
| scrape-off layer |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:12:710PM |
| Author: To Be Determined |
| Session Leader's summary of run 950315 MP# 084 Scrape_off Layer Characterization II Physics Operator: Wolfe Session Leader: LaBombard Engineering Operator: Bertolino/Daigle/Paranay The goal of this run was to continue the study of scrape-off layer conditions in single null diverted plasmas, focussing on the lower plasma currents of 0.4 and 0.6 MA. In the run of 950308, we managed to get data at 0.8 and 1.0 MA but found it difficult to obtain vertically stable plasmas at the lower currents. The challenge for Steve today was to navigate around unstable equilibria at 0.4 and 0.6 MA, allowing us to complete first half (diverted plasmas) of this miniproposal. As usual, Steve was up to the task. He started with a successful 0.5 MA shot from 950202 and performed some extensive wire-head surgery on it. By shot 10, we had a stable 0.4 MA shot with the desired gaps and scanning probe target position. Meanwhile, the first 10 shots were used also used to test the response of the scanning probe during RF. The problem with the scanning probe power supplies dropping out during RF seems to have been fixed. However, there is still some pickup on the +15 volt supply which shows up just noticably on the scanning probe's position signal. These tests where performed at the 1 MW level. It remains to be seen if further problems show up at higher powers. In any case, it looks like the probe will function at the 1 MW RF level which is good news for the planned LLNL remote run. Scanning probe data up to the LCFS was taken for a range of densities for Ip = 0.4 MA over shots 14 to 19. The switch-over to 0.6 MA went remarkably well and I figured that our luck had to run out soon. Yet, we got a variety of densities on shots 21 to 26. We had some difficulty with the LCFS shrinking away from the probe at high densities. Then shot 26 ended with a VDE disruption, directly hitting the scanning probe. The north and south probes got melted and shorted to the probe body (sounds familiar?). We changed the bias on these probes to "floating" mode and continued on. By shot 29, we got the desired high density data point (NL_04 = 1.4e20). To provide a comparison with results from the 950308 run, we dialed up a 0.8 MA shot. No problem. We took probe data up to the LCFS with the two standard density ramps, completing the diverted phase of this miniproposal. Shot 32 had a Sc injection (in preparation for tomorrow's run). Shot 35 had a CH4 injection through NINJA capillaries B22-022 and B31-086. Garry and Dave managed to see a directional CII "plume" from the B22-022 capillary using the newly installed Culham camera system (exposure time is feedback controlled). The diverted plasma portion of this miniproposal is now complete. The second half of MP#084 involves these same currents and densities, but in limited plasmas. See entries in the logbook under the physics operator and session leader topics for shot-to-shot commentary. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:53:520PM |
| Author: To Be Determined |
| Physics Operator Summary for 950315 MP#084 SOL Characterization II SL: LaBombard PO: Wolfe EO: Bertolino/Daigle/Paranay The run plan was as folllows: 5.3 Tesla deuterium plasmas, no impurity gas injection, maximum overnight wall conditioning (D2 ECDC) to try and clean up from the recent leak. Engineering set up should be as for shot #950307002 on supply timing, A-side plenum filled to 19psi (D2). B-side lower plenum filled with argon to 4psi, but not enabled for first shot. Fill pressure will be determined in the morning after ECDC. Initial Segment 1 startup programming will be from 950314020, to be tweaked up to taste. (0) - Obtain a decent diverted shot at 0.4 MA vaguely related to the equilibrium developed for the 0.5 MA shots (start from 950202020, lose the sweeps, change the gains, recalculate the RCUR predictor, etc.). Tweak the outer discharge shape to have a constant strike point location (probe 2 on outer divertor), good scanning probe targeting, and good gaps. Ideally we would use x-point control rather than strikepsi control. If we must sacrifice constant strike point control in order to get a good probe target then so be it. The challenge will be to get good plasmas back of any type, really. The low current request is an additional complication. If we can not do 0.4 MA then we could try 0.6 MA. (10 shots?) Again, five key equilibrium shape parameters need to be watched during this run: inner gap > 1.5 cm, outer gap > 1.5 cm, distance to second separatrix (SSEP on EFIT scope) > 1.7 cm, constant outer divertor strike point location, and constant scanning probe target flux surface location. (1) - tune up a density ramp from NL_04 = 0.5e20 at 0.5 sec to 1.0e20 at 1 sec. Fire the scanning probe at 0.5, 0.75 and 1.0 sec. (3 shots) (2) - density ramp from NL_04 = 0.8e20 at 0.5 sec to 1.5e20 at 1 sec, fire probe (3 shots) (2a) - optional at 1.0 MA: density ramp from NL_04 = 1.0e20 at 0.5 sec to 2.0e20 at 1 sec, fire probe (3 shots) - repeat steps (1) and (2) for plasma currents of 0.6, and 0.8 MA. If all goes well then repeat for 1.0 MA. (3) - for last 2 shots, return to 0.8 MA with density ramp NL_04 = 0.5e20 at 0.5 sec to 1.0e20 at 1 sec, fire probe We actually completed the work at the two lower currents (.4 and .6MA) and got two density scans at 0.8MA to make contact with previous runs. We did not get to the 1MA cases. We got extended periods with the density as low as 3e19 (NL4) with no problems. The RF was firing in the early part of the pulse (E-port only) and seemed to be reliably getting around 1MW when the densities were reasonable. CH4 injection from NINJA was tried on the last shot, and produced a visible plume, as hoped. There was a Sc injection on the next to last shot. For a blow-by-blow account, see the PHYSICS_OPERATOR topic in the logbook. The first task was to get the 0.4MA equilibrium. We started with a 500kA case from 950202, seriously tweaked (see the logbook for details). On shot 3 we dropped the programming to 384kA to get a nominal 400kA discharge. As I expected, it turned out to be useful to move the OH1 and OH2 crowbar times to .090 sec, from .120, in order to keep the current from overshooting and coming back down. It was also helpful to increase the Ip gain, especially early. There was some problem with hard xrays, which was dealt with by raising the fill. The equilibrium was extablished by shot#10, on schedule, and we began doing the density ramps. At 400kA the higher density led to shark fins and some late disruptions, so we backed off the high end of the ramp. The 400kA data shots were 11:19. The 600kA shots were somewhat more problematic, particularly at the high density end. The crowbar times were put back to .12, and we got a good looking target by #22. It turned out that on the high density cases the EF1 supplies were running out of voltage, leading to loss of target location and eventually to vertical disruptions. We finally had to give up on the highest density for this case. Data shots were from 22 : 31 To do the 800kA case, we reloaded Seg 2 from 950309009, which had used STRKPSI control. The first try ran fine, but the second attempt, with the probe going further in, disrupted early on a vertical problem early. This was corrected by dropping the slow ZCUR P gain from 3 to 1.5, and the fast ZCUR P gain from 5 to 4. The machine does not run well anymore with slow ZCUR P-gain at 3. Future operators should be aware (and beware). Data shots were 32,34,35. Startups were basically ok, 2 fizzles out of 35 attempts. There was one tweak to Bz (IC_EF4). The Bz at t=0 had crept up over the first dozen shots, finally leading to a late breakdown on 11 and a fizzle on 12. This may be a coil cooling problem; there was a definite secular trend in the initial Bz. We started with a fill of 1.8, and raised it to 2.2-2.5 later in the run; this was the only anti-xray remedy taken today. Problems: -------- The EF1 supplies seem to be saturating on voltage late in the pulse, especially on the ramps to high density. This may or may not be a consequence of the new slew rate boards. Cooling was slow today, held up by one upper TF arm. This probably cost us a couple of shots, over the course of the day. The last shot had an alternator problem in check and had to be ramped back up a second time. The shot went ok, but the PF breaker pulled out after the disruption (only time that happened all day). Scorecard: ---------- Fizzles 2 Duds 0 Plasmas 33 ------- -- Total 35 |
| Session Leader Comments | |||
| Mar 15 1995 08:52:51:750AM | 950315001 | Brian Labombard | Shot 1:
Steve: "Loaded shot 950202020 with a bunch of changes" Disrupted at 0.3 sec. Vertically unstable. |
| Mar 15 1995 09:13:52:900AM | 950315002 | Brian Labombard | Shot 2:
Amazing 0.5 MA plasma. Are we just lucky? 5 small moly injections. Steve will reduce current on next shot and reduce the gain on strikepsi control. RF pulsed three times starting at .44 sec. FSP will fire on next shot to test interaction with RF. |
| Mar 15 1995 09:28:48:470AM | 950315003 | Brian Labombard | Shot 3:
Another nice plasma. 0.4 MA as requested. FSP firing at 0.5, .78, and .96 sec. Rest position is -20 mm No problem with RF on probe position or on power supplies. |
| Mar 15 1995 09:42:19:720AM | 950315004 | Brian Labombard | Shot 4:
0.5 MA dropping to 0.4 MA. Disrupted at 0.76 sec. Plasma bumps the inner wall at 0.6 sec which leads to a large density rise. FSP firing at 0.5, .78, and .96 sec. Rest position is -20 mm No RF pulses. |
| Mar 15 1995 10:02:33:260AM | 950315005 | Brian Labombard | Shot 5:
Again 0.5 MA dropping to 0.4 MA. FSP firing at 0.5, .78, and .96 sec. Rest position is -20 mm Three RF pulses starting at .38 sec. Last pulse is 0.5 MW. No effect on probe position trace. +15 volt supply shows a fast spike down to 14 volts at the turn on of the 0.5 MW pulse. Try to lower the density on the next shot to 0.5e20 on NL_04. Also try to increase the inner gap and lower the outer strike point. |
| Mar 15 1995 10:17:34:060AM | 950315006 | Brian Labombard | Shot 6:
Again 0.42 MA. FSP firing at 0.5, .78, and .96 sec. Rest position is -20 mm Three RF pulses starting at .38 sec. Last pulse is 0.6 MW. Some effect on probe position trace is now showing up. +15 volt supply shows a fast spike down to 10 volts at the turn on of the 0.6 MW pulse. NL_04 is 0.5e20 as requested. Inner gap needs to be increased. |
| Mar 15 1995 10:26:58:550AM | 950315007 | Brian Labombard | Shot 7:
0.42 MA. Disruption at .465 sec. FSP firing at 0.5, .78, and .96 sec. Rest position is -5 mm |
| Mar 15 1995 10:27:42:240AM | 950315007 | Brian Labombard | Shot 7:
Sorry - Disruption was at .378 sec. |
| Mar 15 1995 11:04:15:750AM | 950315009 | Brian Labombard | Shot 9:
Good shot. Almost have the target plasma now. Gaps are good. Tweaking SSEP again. FSP firing at .6, .78, and .96 sec. Rest position is 0 mm. |
| Mar 15 1995 11:18:33:840AM | 950315010 | Brian Labombard | Shot 10:
FSP firing at .60, .76, and .96 sec. Rest position is 0 mm. SSEP improved. Target is not as good. Add density ramp on next shot. |
| Mar 15 1995 11:32:29:910AM | 950315011 | Brian Labombard | Shot 11:
FSP firing at .66, .81, and .96 sec. Rest position is 0 mm. SSEP improved. Target is not as good. Add density ramp on next shot. |
| Mar 15 1995 11:36:45:230AM | 950315011 | Brian Labombard | Shot 11:
Sorry. pressed the wrong button. FSP firing at .66, .81, and .96 sec. Rest position is 0 mm. Density ramp. Probe samples: .52, .71, 1.3 e20 Full plasma detachment at .94 sec? Setting up 0.3e20 to 0.9e20 target for next shot. |
| Mar 15 1995 11:40:45:930AM | 950315012 | Brian Labombard | Shot 12:
Argon is off on this shot. FSP firing at .66, .81, and .96 sec. Rest position is 10 mm. Fizzle. |
| Mar 15 1995 11:57:14:550AM | 950315013 | Brian Labombard | Shot 13:
Argon is off on this shot. FSP firing at .66, .81, and .96 sec. Rest position is 10 mm. Divertor detaches at .87 sec. FSP samples: .34, .6, .84 e20 |
| Mar 15 1995 12:23:41:130PM | 950315014 | Brian Labombard | Shot 14:
Argon is off on this shot. FSP firing at .66, .81, and .96 sec. Rest position is 15 mm. Sampled: .38, .57, .79 e20 Increasing first density point on next shot. |
| Mar 15 1995 12:26:15:780PM | 950315015 | Brian Labombard | Shot 15:
Argon is off on this shot. FSP firing at .66, .81, and .96 sec. Rest position is 15 mm. Sampled: .61, .75, .87 e20 Target is 17 mm. |
| Mar 15 1995 12:51:14:760PM | 950315017 | Brian Labombard | Shot 17:
Argon is off on this shot. Programmed 0.45e20 on start of ramp. FSP firing at .66, .81, and .96 sec. Rest position is 17 mm. Sampled: .43, .63, .77 e20 Target was 15 mm. |
| Mar 15 1995 12:59:34:490PM | 950315018 | Brian Labombard | Shot 18:
Argon is off on this shot. Programmed 0.45e20 on start of ramp. FSP firing at .66, .81, and .96 sec. Rest position is 15 mm. Sampled: .73, .83, .96 e20 Target moved to 18 mm. We will retake this shot. |
| Mar 15 1995 01:18:58:300PM | 950315019 | Brian Labombard | Shot 19:
Argon is off on this shot. FSP firing at .66, .81, and .96 sec. Rest position is 18 mm. Sampled: .74, .84, .91 e20 Change to 0.6 MA on next shot. MOve FSP out to -10 mm on next shot. |
| Mar 15 1995 01:34:12:020PM | 950315020 | Brian Labombard | Shot 20:
Argon is off on this shot. FSP firing at .66, .81, and .96 sec. Rest position is -10 mm. Nice 0.8 MA plasma. Samples: .76, .84, .96 e20 Changing to 0.5e20 for start of ramp on next shot. Target is 6 mm. Moving probe to 3 mm for next shot. |
| Mar 15 1995 01:45:46:580PM | 950315021 | Brian Labombard | Shot 21:
Argon is off on this shot. FSP firing at .66, .81, and .96 sec. Rest position is 3 mm. Samples: .65, .78, .91 e20 Target is moving: 4 mm to 10 mm Try to fix RXL on next shot. |
| Mar 15 1995 02:07:17:260PM | 950315022 | Brian Labombard | Shot 22:
Disrupted at 0.962 sec. FSP firing at .66, .81, and .96 sec. Rest position is 3 mm. Samples: .67, .80, .90 e20 Target is moving: 4 mm to 15 mm |
| Mar 15 1995 02:20:13:780PM | 950315023 | Brian Labombard | Shot 22:
Nice target at 8 mm. FSP firing at .66, .81, and .96 sec. Rest position is 3 mm. Samples: .54, .72, .86 e20 Target is moving: 4 mm to 15 mm |
| Mar 15 1995 02:29:34:710PM | 950315024 | Brian Labombard | Shot 24:
FSP firing at .66, .81, and .96 sec. Rest position is 7 mm. Samples: .48, .60, .75 e20 Made it to LCFS on three scans. Change to next density ramp. |
| Mar 15 1995 02:46:29:510PM | 950315025 | Brian Labombard | Shot 25:
FSP firing at .66, .81, and .96 sec. Rest position is 7 mm. Samples: .8, .9, 1.1 e20 First two scans go to LCFS. Last scan is 5 mm out. Did not get the full density ramp. Try again with increased gain on the density feedback. |
| Mar 15 1995 03:07:33:060PM | 950315026 | Brian Labombard | Shot 26:
FSP firing at .66, .81, and .96 sec. Rest position is 7 mm. Samples: 0.8, 1.1, 1.4 e20 First two scans make it to LCFS. Last scan is 10 mm out. Next shot is a slower ramp starting 0.8e20 at .3 sec to 1.5 at 1.0 sec. |
| Mar 15 1995 03:19:05:900PM | 950315027 | Brian Labombard | Shot 27:
FSP firing at .66, .81, and .96 sec. Rest position is 7 mm. Samples: 1.0, 1.35, 1.46 e20 First scan makes it to LCFS. Second scan is 7 out. Disrupts on third scan. |
| Mar 15 1995 03:46:35:870PM | 950315028 | Brian Labombard | Shot 28:
FSP firing at .66, .81, and .96 sec. Rest position is 7 mm. Samples: 1.4, 1.3 e20 Target moved up to 18 mm. Looks like the disruption on the previous shot killed the north probe. It appears to be shorted to the body. |
| Mar 15 1995 03:51:31:150PM | 950315029 | Brian Labombard | Shot 29:
FSP firing at .66, .81, and .96 sec. Rest position is 14 mm. Samples: 1.3, 1.35 e20 First scan is 4 mm INSIDE LCFS. second scan is at LCFS Last scan is at disruption. North probe is shorted to body. Nex shot will have it floating. |
| Mar 15 1995 04:03:43:550PM | 950315030 | Brian Labombard | Shot 30:
FSP firing at .66, .81, and .96 sec. Rest position is 5 mm. North probe is floating Samples: .36, .58, .7 e20 South probe is also shorted to the body. Retake the shot. |
| Mar 15 1995 04:11:26:810PM | 950315031 | Brian Labombard | Shot 31:
FSP firing at .66, .81, and .96 sec. Rest position is 5 mm. North and South probes floating All three scan make it LCFS. Samples: .4, .59, .74 e20 |
| Mar 15 1995 04:24:50:060PM | 950315032 | Brian Labombard | Shot 32:
0.8 MA shot. FSP firing at .66, .81, and .96 sec. Rest position is 0 mm. North and South probes floating Samples: .5, .75, .9 e20 Sc injection at 1.05 sec. |
| Mar 15 1995 04:42:24:830PM | 950315033 | Brian Labombard | Shot 33:
0.8 MA shot. FSP firing at .66, .81, and .96 sec. Rest position is 7 mm. North and South probes floating Disruption at .452 sec. |
| Mar 15 1995 04:53:09:250PM | 950315034 | Brian Labombard | Shot 34:
0.8 MA shot. FSP firing at .66, .81, and .96 sec. Rest position is 7 mm. North and South probes floating Samples: .53, .74, .92 e20 |
| Mar 15 1995 05:03:22:250PM | 950315035 | Brian Labombard | Shot 35:
0.8 MA shot. FSP firing at .66, .81, and .96 sec. Rest position is 7 mm. North and South probes floating Samples: .7, .82, .9 e20 0, 0, 2 mm outside LCFS CH4 NINJA injection from B22-022 and B31-086. |
| Physics Operator Comments | |||
| Mar 15 1995 07:34:21:380AM | Steve Wolfe | The run plan for Wednesday 15-MAR-1995 (MP# 084 Scrape-off Layer
Characterization II) is as follows: 5.3 Tesla deuterium plasmas, no impurity gas injection, maximum overnight wall conditioning (D2 ECDC) to try and clean up from the recent leak. Engineering set up should be as for shot #950307002 on supply timing, A-side plenum filled to 19psi (D2). B-side lower plenum filled with argon to 4psi, but not enabled for first shot. Fill pressure will be determined in the morning after ECDC. Initial Segment 1 startup programming will be from 950314020, to be tweaked up to taste. | |
| Mar 15 1995 07:35:47:430AM | Steve Wolfe | (0) - Obtain a decent diverted shot at 0.4 MA vaguely related to the
equilibrium developed for the 0.5 MA shots (start from 950202020, lose the sweeps, change the gains, recalculate the RCUR predictor, etc.). Tweak the outer discharge shape to have a constant strike point location (probe 2 on outer divertor), good scanning probe targeting, and good gaps. Ideally we would use x-point control rather than strikepsi control. If we must sacrifice constant strike point control in order to get a good probe target then so be it. The challenge will be to get good plasmas back of any type, really. The low current request is an additional complication. If we can not do 0.4 MA then we could try 0.6 MA. (10 shots?) Again, five key equilibrium shape parameters need to be watched during this run: inner gap > 1.5 cm, outer gap > 1.5 cm, distance to second separatrix (SSEP on EFIT scope) > 1.7 cm, constant outer divertor strike point location, and constant scanning probe target flux surface location. | |
| Mar 15 1995 07:36:38:110AM | Steve Wolfe | (1) - tune up a density ramp from NL_04 = 0.5e20 at 0.5 sec to 1.0e20 at 1
sec. Fire the scanning probe at 0.5, 0.75 and 1.0 sec. (3 shots) (2) - density ramp from NL_04 = 0.8e20 at 0.5 sec to 1.5e20 at 1 sec, fire probe (3 shots) (2a) - optional at 1.0 MA: density ramp from NL_04 = 1.0e20 at 0.5 sec to 2.0e20 at 1 sec, fire probe (3 shots) - repeat steps (1) and (2) for plasma currents of 0.6, and 0.8 MA. If all goes well then repeat for 1.0 MA. (3) - for last 2 shots, return to 0.8 MA with density ramp NL_04 = 0.5e20 at 0.5 sec to 1.0e20 at 1 sec, fire probe | |
| Mar 15 1995 08:44:53:350AM | 950315001 | Steve Wolfe | Shot #950315001
Use segment 1 from a successful shot from yesterday 950314020. Use segment 2 based on 950202020 with lots of changes. (prepared shot was in PCS$WOLFE:PCS_950315901). This is programmed for 500kA, we'll start from here and drop it to 400 if possible. Coldstart was run at 07:39 Note - among the changes, I noticed this morning that the Ip gain in Seg 2 wasn't on until .127 sec, so the forst 27msec of the segment was uncontrolled! I moved the initial point on the P-gain to .05sec Also note that the new slew rate boards are in the EF1 supplies. These were in yesterday for the last fizzle, but have not been tested double swing. At 08:25 base pressure is 3.4e-6 Fill set to 1.8e-5 Result: Disrupts around 300msec. |
| Mar 15 1995 09:01:56:880AM | 950315002 | Steve Wolfe | Shot #950315002
Decrease CLEARIN to -.005, reduce EF4 to 1500A Ran full length. Lots of injections, still thrashing early on EF2 and OH2's It may be the strikepsi control, which we want to reduce anyway |
| Mar 15 1995 09:20:58:090AM | 950315003 | Steve Wolfe | Shot #950315003
Reduce Ip programming to 384ka Reduce physics P gain on strkpsi from 120 to 40 INcrease zxl gain to 32 (8 in H units) Got xrays, but it ran; disrupts at 1.29 Current comes down to a flattop at 420kA |
| Mar 15 1995 09:37:40:520AM | 950315004 | Steve Wolfe | Shot #950315004
Move OH crowbars from .120 to .090sec At .5sec, increase RXL gain to 90/sec decrease STRKPSI control from 3 to 1, then 0 at .5sec Increase fill to 2.0e-5 Disrupted at .8sec - growing vertical oscillation There is a big oscillation on the EF2's, in phase. May have too much gain on RXL and/or CLEARIN |
| Mar 15 1995 09:52:37:730AM | 950315005 | Steve Wolfe | Shot #950315005
Decrease RXL gain to 30/s throughout INcrease early P-gain on Ip Ran ok, disruption on ramp-down at 1.27sec Multiple injections |
| Mar 15 1995 10:10:45:790AM | 950315006 | Steve Wolfe | Shot #950315006
Reduce NL_04 program to be flat at 5e19 Increase CLEARIN to 0. at 0.5sec Move RCUR from .662 to .664 at 0.5sec Drop ZXL by 1cm to -1.29e-2, and further out on rampdown Hold RXL out at rampdown Maintain low RXL gain through rampdown Raise Ip gain to constant level throughout shot Ran, but disrupts at 1.18; I'll need to deal with the ramp-down soon Current looks pretty flat. Inner gap still a bit too small, strike still too high |
| Mar 15 1995 10:30:08:030AM | 950315007 | Steve Wolfe | Shot #950315007
Get rid of STRKPSI control completely (including integral gain) Increase CLEARIN to 0.004 from 0.5sec Increase RCUR from .664 to .666, and don't swing in as fast on rampdown Got hards again, early disruption EF2L went to zero current at 180msec, disrupted at 390?? |
| Mar 15 1995 10:41:20:730AM | 950315008 | Steve Wolfe | Shot #950315008
Raise fill to 2.3e-4, everything else left the same as 7: Get rid of STRKPSI control completely (including integral gain) Increase CLEARIN to 0.004 from 0.5sec Increase RCUR from .664 to .666, and don't swing in as fast on rampdown That one ran ok, I still don't understand what happened to #7 ZXL is constant at +5000 a-m error, RXL is moving out, CLEARIN is pretty constant Left gap is 1.5 to 2 except for a glitch between .5 and .6 (crossover!) right gap is around 2, strikes a bit high |
| Mar 15 1995 10:58:51:260AM | 950315009 | Steve Wolfe | Shot #950315009
Lower ZXL to -.016 from -.0129 Raise ZXU from .03 to .04 Ran ok. Gaps are ok, strike still rides a little high SSEP better, could stand a litle more |
| Mar 15 1995 11:18:42:300AM | 950315010 | Steve Wolfe | Shot #950315010
Raise ZXU from .04 to .05 Drop EF4 to 940A Ramp Clearin in faster at ramdown Enable Ar puff Ran ok. 2pi up slightly but still below 100kW in flattop. SSEP is now out of the vessel outer strike goes up above the mose at end of flattop |
| Mar 15 1995 11:33:06:090AM | 950315011 | Steve Wolfe | Shot #950315011
Program density ramp from 0.5e20@.65 to 1.e0 at 1sec Program EF4 ramp from 920 at .6 to 1900 at 1sec Bring Ip down faster Raise fill to 2.5e-5 Disrupted at 1sec Looks like a shark fin Detaches from divertor around .7 |
| Mar 15 1995 11:56:02:020AM | 950315013 | Steve Wolfe | Shot #950315013
INcrease EF4 from 1085 to 1100a (it's that or a V_OH1 tweak) Program density ramp from 0.3e20@.65 to .9e20 at 1sec Argon puff off Got it back, Disrupts at 1.1sec Nice early breakdown, current rise Density starts REALLY LOW, as programmed Still looks like its detaching early Growing vertical instability on early rampdown |
| Mar 15 1995 12:13:48:860PM | 950315014 | Steve Wolfe | Shot #950315014
Only rampdown changes, ramp CLEARIN in faster, Ip down a little faster For next shot, narrow the Ar pulse to 13msec, still leave valve disabled Made it further into rampdown Brian got good data, detaching during ramp |
| Mar 15 1995 12:25:22:690PM | 950315015 | Steve Wolfe | Shot #950315015
Raise initial density to 6e19, leave ramp to 0.8 after .65 Ran ok. Brian likes the data |
| Mar 15 1995 12:40:58:110PM | 950315016 | Steve Wolfe | Shot #950315016
Lower initial density to 4.5e19, leave ramp to 0.8 after .65 Cooling is slow today, there's one upper TF arm that's lagging Fizzle. Why? Fields look better than 15, which went ok. |
| Mar 15 1995 12:49:27:350PM | 950315017 | Steve Wolfe | Shot #950315017
Drop fill to 2.2e-5 and repeat: Lower initial density to 4.5e19, leave ramp to 0.8 after .65 Ran ok. Some ECE data lost (CAMAC error) |
| Mar 15 1995 12:57:20:410PM | 950315018 | Steve Wolfe | Shot #950315018
Raise initial density to 7e19, ramp to 1.e20 after .65 Try to see the shark fin come back (or not) Disrupts at 1sec, similar to before. This completes the data for 400kA |
| Mar 15 1995 12:59:28:940PM | 950315018 | Steve Wolfe | Shot #950315018
Raise initial density to 7e19, ramp to 1.e20 after .65 Try to see the shark fin come back (or not) Disrupts at 1sec, similar to before. Brian's target moved away. Need to redo this point. |
| Mar 15 1995 01:15:30:470PM | 950315019 | Steve Wolfe | Shot #950315019
Repeat with deeper probe insertion: Raise initial density to 7e19, ramp to 1.e20 after .65 Try to see the shark fin come back (or not) This one ramped on down, vertical problem at 1.0, but made it through Longer RF pulse at .43 to .53 sec, 1.1MW |
| Mar 15 1995 01:29:37:280PM | 950315020 | Steve Wolfe | Shot #950315020
Raise Ip programing to 570kA, EF4 initial level to 1400a Leave crowbar settings the same (.090 on OH's) Ran through Current turns around a little after crowbar, need to increase the programmed value. Gaps look ok |
| Mar 15 1995 01:45:00:580PM | 950315021 | Steve Wolfe | Shot #950315021
Move 400kA point earlier on Ip programming to match the real rise Start NL_04 at 5e19 and ramp to 1.0 between .65 and 1.0 Flatten EF4 at 1435a Ran fine. See how the target looks Density has three early wobbles? X-point is now too far outside |
| Mar 15 1995 02:00:19:180PM | 950315022 | Steve Wolfe | Shot #950315022
Move RXL from -.005 to -.01 Increase integral gain on CLEARIN from 4 to 8 Turn on NL_04 derivative gain at 0.4 sec to 2.0 Disrupted at about 0.9 sec, looks like a vertical problem again EF2 U railed early and stayed up. Last time it also railed. The CLEARIN tweak was the WRONG thing to do. |
| Mar 15 1995 02:16:06:180PM | 950315023 | Steve Wolfe | Shot #950315023
Move crowbar times back to 0.120 Drop CLEARIN Integral gain back to 4 Slow down the current rise program .1sec to .4 sec: Ip from 400kA->600kA Ran through, we'll see how the target looks EF2's now well off the rail Target looks ok |
| Mar 15 1995 02:29:09:200PM | 950315024 | Steve Wolfe | Shot #950315024
Change P gain on NL_04 from 8 to 3 at .4sec to try to reduce density wobble. No equilibrium changes Ran fine. Still a little drop in density following the RF. Target looks good, on to the next ramp |
| Mar 15 1995 02:39:08:220PM | 950315025 | Steve Wolfe | Shot #950315025
Change density ramp: 0.8 to 1.5e20 Ran through ok.Looks like a bit of a vertical problem at EOF Didn't get the high density. |
| Mar 15 1995 03:05:04:770PM | 950315026 | Steve Wolfe | Shot #950315026
Raise both P and D gains on NL_04 at 0.65sec Ran ok, but got some hard xrays early. Breakdown almost doesn't make it. Disrupted at EOF. Got to 1.5 at 1sec EF1's seem to stop following demand at around .75 sec (flat out?) |
| Mar 15 1995 03:18:09:290PM | 950315027 | Steve Wolfe | Shot #950315027
Raise fill to 2.4e-5 (to try to hold down xrays) Slow down density ramp, starting at .3 sec instead of .65 The idea is to require less voltage out of EF1 by slowing things down No xrays, still disrupts just before EOF No improvement |
| Mar 15 1995 03:34:29:670PM | 950315028 | Steve Wolfe | Shot #950315028
Program flat density at 1.3e20 Ramp EF4 to 2000A late Disrupted again, before EOF Looks like a vertical problem Density goes way high early. |
| Mar 15 1995 03:44:48:560PM | 950315029 | Steve Wolfe | Shot #950315029
Slow down density ramp, reach 1.3e20 at .6sec Ramp EF4 to 2000A late Still disrpting before EOF. Brian has a shorted probe from disruption two or three shots ago. Got the density this time, and EF2's are off the rail. Still losing control of the EF1's at about the same time Done with this density at 600kA |
| Mar 15 1995 03:59:26:410PM | 950315030 | Steve Wolfe | Shot #950315030
Density ramp from 0.3e20 to 0.8e20 Brian re-configuring his probes because N is shorted Ran ok. Got the density we asked for Looks like S probe is also shorted. |
| Mar 15 1995 04:05:34:560PM | 950315031 | Steve Wolfe | Shot #950315031
Repeat with S probe floating as well Looks ok. |
| Mar 15 1995 04:23:06:550PM | 950315032 | Steve Wolfe | Shot #950315032
Load seg 2 from 950309009, an 800kA shot, program NL_04 from .5 to 1.0e20 Fill NINJA plenum to 8psi CH4 Enable shitshooter gate valve; will fire Sc at 1.sec Ran fine. Note that this one is using strkpsi control. |
| Mar 15 1995 04:32:02:360PM | 950315033 | Steve Wolfe | Shot #950315033
Repeat to get probe scans Disrupted early. Damn, it had the old bad gains. Must have just made it through last time |
| Mar 15 1995 04:45:42:540PM | 950315034 | Steve Wolfe | Shot #950315034
Drop slow Zcur gain to 1.5, fast P gain to 4 Enable NINJA puff (CH4 at .35 sec) There was some problem writing to the tree to set up the NINJA Got it! |
| Mar 15 1995 05:02:47:050PM | 950315035 | Steve Wolfe | Shot #950315035
NL_04 ramp from .8 to 1.5 e20 Turn on NL_4 D gain at 2.0 from 0.5sec NINJA system was not enabled at PC on lasr shot; will be this shot Alternator had to ramp up twice. Shot ran ok, disrupted at 1.25 got a PF fault late EF1 may have lost control (saturated) again |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:33:14:240AM | Plasma | Ok | no faults |
| 2 | 08:53:28:460AM | Plasma | Ok | No Faults. |
| 3 | 09:13:08:370AM | Plasma | Ok | no faults |
| 4 | 09:30:19:360AM | Plasma | Ok | no faults |
| 5 | 09:45:38:430AM | Plasma | Ok | no faults |
| 6 | 10:02:23:440AM | Plasma | Ok | no faults |
| 7 | 10:17:09:720AM | Plasma | Ok | no faults |
| 8 | 10:31:27:760AM | Plasma | Ok | no faults |
| 9 | 10:48:06:660AM | Plasma | Ok | no faults |
| 10 | 11:06:11:070AM | Plasma | Ok | no faults |
| 11 | 11:23:43:040AM | Plasma | Ok | no faults |
| 12 | 11:39:12:110AM | Plasma | Ok | no faults |
| 13 | 11:47:12:180AM | Plasma | Ok | no faults |
| 14 | 12:05:20:500PM | Plasma | Ok | no faults |
| 15 | 12:16:26:240PM | Plasma | Ok | no faults |
| 16 | 12:32:38:990PM | Plasma | Ok | no faults |
| 17 | 12:42:07:550PM | Plasma | Ok | no faults |
| 18 | 12:52:05:680PM | Plasma | Ok | no faults |
| 19 | 01:09:39:920PM | Plasma | Ok | No Faults. |
| 20 | 01:20:58:270PM | Plasma | Ok | No Faults. |
| 21 | 01:34:06:450PM | Plasma | Ok | No Faults. |
| 22 | 01:56:07:210PM | Plasma | Ok | no faults |
| 23 | 02:08:29:550PM | Plasma | Ok | No Faults. |
| 24 | 02:20:51:760PM | Plasma | Ok | No Faults. |
| 25 | 02:33:00:450PM | Plasma | Ok | No Faults. |
| 26 | 02:51:41:330PM | Plasma | Ok | No Faults |
| 27 | 03:08:00:360PM | Plasma | Ok | no faults |
| 28 | 03:22:40:320PM | Plasma | Ok | no faults |
| 29 | 03:35:59:840PM | Plasma | Ok | no faults |
| 30 | 03:49:57:490PM | Plasma | Ok | no faults |
| 31 | 04:01:45:030PM | Plasma | Ok | no faults |
| 32 | 04:15:41:950PM | Plasma | Ok | no faults |
| 33 | 04:28:41:420PM | Plasma | Ok | no faults |
| 34 | 04:41:57:570PM | Plasma | Ok | no faults |
| 35 | 04:52:57:570PM | Plasma | Ok | comm fail oh2u, oh1 |