Miniproposals

Miniproposal: 167 Date Filed: 7/23/1996 Title: Impurity Screening: Divertor Compression and the Role of First Author: Bruce Lipschultz Session Leader: Bruce Lipschultz (shots 1-36)

Engineering Operator Run Comment

mp167/Terry/Cochran/Bertolino/Wolfe/setup as on 97061731

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Entered: Jul 7 2004 03:49:16:977PM

Author: To Be Determined

Run 970619 Mini-proposal 167: Impurity Screening: Divertor Compression and the Role of Core Impurity Confinement Physics Operator: Steve Wolfe Session Leader: Bruce Lipschultz Engineering Operator: Frank Silva ('dad') The purpose of this run was to try and deal with the following question: (1) Only a small fraction of injected impurities are found in the core. Where are they going? The new Divertor RGA 'Prisma' was used to measure the neutral density in the divertor. The core levels were determined from McPherson and HIREX measurements. The injected quantities will be determined from calibration of the piezo valves used. The mp also includes studies of RF-heated H-mode plasmas but only the ohmic issues were addressed today. During this run we obtained some baseline data, primarily with Ar. The primary difficulty was the run itself. We had reproducibility problems that may be attributable to lack of an ionization gauge with a 'view' of the plasma. In addition, there was difficulty in achieving densities above nl04=1.3e20. As we pushed the density up the the plasma became very disruptive. And each disruption seemed to cause 2 fizzles..... In looking at the Ar data, the primary shots that are usable are 5,15,17,20,22 and 23 with 5 being the baseline shot. Analysis of the RGA data using the calibration numbers from the offline VTS work indicates high Ar neutral densities in the divertor (of order .1 mTorr Ar) with nAr/n_neutral there ~ .3 percent. The compression of Ar in the divertor compared to the core, n_Ar(div)/n_Ar(core) ~ 150! Based on these numbers we can account for all of the injected Ar (the amount injected needs an up to date calibration as well). These are high numbers so final analysis will await calibrations on the tokamak. Jim Terry monitored Li-like Ar in the core and found that for typical injections the Ar level stayed constant after the puff. However, for shot 22, the time behaviour was different. At the partial detachment from the outer divertor the Ar level in the core rose by a factor of 2 (.8 sec). At 1.07 second there was another jump in the brightness due to the 'shark fin'. This may be attributed to a rise in density of Ar and/or D2 in the core. We may have obtained some data with N2 but the signal, if there for the Prisma RGA was negligible. We tried injection of Ne for the remainder of the run but no plasma shots were had. The shot descriptions follow: Shot 1: fizzle shot 2: plasma, no RGA shot 3: no plasma shot 4: no plasma Shot# 5 gas injection species none inj. time pulse width gas pressure Comments: nice plasma, good baseline for RGA shot 6: no plasma break for TF fuse fix Shot 7: fizzle shots 8-13: fizzle/dud shot 14: gas injection species Ar, J-bottom piezo inj. time.3 pulse width.03 gas pressure4 PSi Comments: Good shot, Ar did not get in, piezo sticking? Next shot add another valve (B-side lower) with 4 PSi as well. Shot 15 gas injection species Ar, J-bottom & Bisde lower inj. time.3 sec & .6 sec pulse width.03 sec& .03 sec gas pressure4 psi & 4 PSI Comments: shot good. Prisma saturated. J-bottom still did not go but B-side did. Retake and try again shot 16: fizzle Shot 17 gas injection species Ar through B-side lower inj. time.3 sec pulse width.02 seconds gas pressure 4 PSI Comments: good shot, Prisma data ok. J-bottom still not working. nl04 =.9e20. shot 18: fizzle Shot 19 gas injection species Ar through B-side lower inj. time.3 sec pulse width.02 seconds gas pressure 4 PSI Comments: good plasma, nl04=1.2 but no Prisma, repeat. Got probe scans Shot 20 gas injection species Ar through B-side lower inj. time.3 seconds pulse width.02 sec gas pressure4 PSi Comments: good plasma. FSP plume shot. Prisma data good. next shot higher density. This one had nl04=1.2e20. shot 21: fizzle Shot 22 gas injection species Ar thru b-bottom-lower inj. time.3 sec pulse width.02 sec gas pressure4 PSI Comments: good shot, Prisma data, partial detachment on probes 4&5 correlating with large increases in Li-like Ar in the core. Shot 23 gas injection species none inj. time pulse width gas pressure Comments: shot fine but diruption at .88 seconds. nl04= 1.3e20, switch to N2 shot 24: fizzle shot 25: fizzle Shot 26 gas injection species N2 J-bottom inj. time.7 seconds pulse width.03 gas pressure8 PSI Comments: disruption at .95 seconds., no FSP, Prisma ok, no N seen incore (or divertor?) shots 27-28 fizzles shot 29 gas injection species N2 J-bottom inj. time.7 seconds pulse width.08 gas pressure8 PSI Comments: nice shot. Prisma and McPherson got a good signal. nl04=1.2e20. shot 30: dud Shot 31 gas injection species none inj. time pulse width gas pressure Comments: baseline shot. disrupted at 0.6 seconds Shot 32: fizzle Shot 33: fizzle Shot 34: fizzle Shot 35: fizzle Shot 36: fizzle

Physics Operator Summaries

Entered: Jul 7 2004 04:36:57:787PM

Author: To Be Determined

Physop Summmary for 970619 MP: 167 Impurity compression and transport SL: Blip PO: wolfe EO: Silva,Cochrane,Bertolino Run Plan: -------- Engineering setup: ------------------ Power system as for 970617031 Gas setup: B-top 5psi D2 K-side 20psi D2 B-side lower 4psi Argon J-Bottom 4psi Argon (J-bottom) Note: On Wed. night, Tommy purged the B-side upper plenum with D2 and filled it to 12.4 PSI of He3, then disabled SG6 again, as well as PUR1, so the only access to the plenum is P1IN. This should not be touched before the run; we will need to put some of the He3 from B-side upper to J-bot later in the run. To start, Hybrid ENABLE on B-top, K-side, and B-side-upper, but NOT on B-side-LOWER. Also, plenum output valves on both B-side-UPPER and J-BOT should be open. Gate valves: VUV,ECE,PCX, TCX, assuming the relevant vacuums are ok. Run plan: -------- The purpose of this run is to determine where the "screened fraction" of injected impurities (the part that never shows up in the core) goes, and to investigate the role of core transport on the penetration factor for injected impurities. Impurity gas puffing (Ar, N2, and He3) from J-bottom will be used to obtain ohmic plasma data at several densities, all at 1MA. We'll use a shot from Tuesday as a basis, probably 970617031. The initial density setting will be 0.8e20 (NL4), then raise the density to get detachment. After a background shot with no impurity puff, the first impurity gas will be Argon, using J-bot plenum (PG2) and a pulse time (0.3) and width of 30msec The B-side lower will not be used for these first shots. After several densities with Argon puffing (attached to detached), change to N2 puff from J-bottom, then He3. RF should piggyback during the run. RF timing should be 0.5 to 0.7 sec. Results: ------ This was a really painful run, with terrible startup reliability. We ended up with only 13 plasmas out of 36 attempts. Argon response was obtained for two densities, and N2 response for 1 density. An attempt to inject Ne at the end of the run was unsuccessful because we could get nothing but fizzles. He3 was never attempted. Some useful data was obtained, but probably less than half of the planned experiment was completed. Early in the run we had problems with cooling, and clearing the O2 alarms for cell access. Unfortunately, several accesses were required to get essential systems on-line. By 11:20 we had only had 6 attempts, and only two of them were plasmas. Most of the fizzles in the first six shots seemed to correlate with unbalanced EF4 cooling, but later in the run the balance was good and we were still plagued with non-plasmas. We had an additional delay due to a tf crowbar following shot 6. At about the time the fuses had been replaced and the hipot completed, the IGT torus ion gauge died and had to be swapped to the backup gauge, which doesn't have a line-of-sight to the plasma. It later turned out that the IGT gauge was ok, and the problem was a loose connector at the gauge controller. We also lost some time on a data server hang. Attempts to fix the startup were unsuccessful. I tried resymmetrizing the EF2's, and several tweaks to EF4, RCUR offset, and V_OH1 between shots 6 and 11, with no good startups. Finally for shot 12 I gave up and reloaded #5, which also didn't work. A counter-intuitive Br tweak resulted(?) in good plasmas on 14,15,17,19,20,22,and 23 [7 for 10], but after a 1MA disruption on 23 the fizzles and duds were back with a vengence. It probably didn't help that most of the plasmas later in the run disrupted, either from high density, impurities, or injections, but that may not have been the whole story. The fields seemed to be varying significantly from shot to shot, with no program changes. After shot 22 the replacement ITG ion gauge stopped working, so we left it off for the remainder of the run. It was necessary to have Joe force an interlock in the ladder logic to keep having the ITG off not cause a gas-fill-fault condition. As noted above, the ITG problem was actually with a loose connector, which was fixed after the run. It is not clear that the loss of the direct-view ITG affected the startup, although there were a few duds during the time with no ion gauge, while only fizzles were obtained earlier. There were numerous late breakdowns throughout the run. The new JBOT piezo, which was supposed to be used for all the impurity injection today, took a while to get going, despite having been exercised last night with a DC supply. It appears this valve has a 30msec deadtime, so you have to provide at least that long a pulse to get anything out of it. The differential gauges on the new small plenums seem to work well, and allow an absolute measure of the injected gas. Since we weren't getting a response initially from the JBOT valve, the Argon experiments were done using B-side-lower. Lots of time was spent purging and re-filling various plenums as we tried to change gases. Getting to high density (nl4 > 1.2e20 m^-2) was problematic. While we were able to get up to 1.4e20 with heavy puffing from two valves, these shots all ended in disruptions. After the run, Brian determined that the burping probe capillary is leaking into the torus when he attempts to fill the probe plenum, so that no gas ends up in the plenum. This apparently happened sometime during the run today. The burping probe is now out of commission until this can be repaired. The one piece of good operational news today is that the hybrid wavegen glitch seems to have been diagnosed and remedied. TWF confirmed that the wavegen failures yesterday corresponded to cases where the DECODER INIT was not completed before the BIT_WAVEGEN INIT, so that the wavegen would have fired when the decoder got init'ed and been inert thereafter. This was thought to be excluded by the fact that the CAMAC initialization on DAQA normally runs much faster than the BITBUS initialization on SHAPE, but this apparently is not the case on rare occasions. Tom added an explicit dependence to the BIT_WAVEGEN INIT task to force it to wait until after the DECODER is armed. The RF was successful in getting up to P>1.5MW, and we had some H-modes during the RF pulses. The RF group decided that the tuning and conditioning so far is adequate to go ahead with tomorrow's physics run, rather than requiring an additional conditioning day. Hopefully Goetz will have a better time with startups than I did. Scorecard: ---------- tests 0 duds 3 fizzles 20 plasmas 13 ------- -- shots 36

Session Leader Comments
Jun 19 1997 08:18:12:070AM		Bruce Lipschultz	Run 970619 Mini-proposal 167: Impurity Screening: Divertor Compression and the Role of Core Impurity Confinement Physics Operator: Steve Wolfe Session Leader: Bruce Lipschultz Engineering Operator: Frank Silva ('dad') The purpose of this run is to try and deal with the following question: (1) Only a small fraction of injected impurities are found in the core. Where are they going? The new Divertor RGA 'Prisma' will be used to measure the neutral density in the divertor. The mp also includes studies of RH-heated H-mode plasmas but only the ohmic issues will be dealt with today. The plan is to start with Ar injection throught the J-bottom piezo valve. The core nl04 will be 0.8e20 and 1 MA plasmas. The core level and divertor densities of Ar will be measured at at least 2 densities before we move on to a new gas. For each setting of gas and density we will need at least 2 shots in order to get a background shot without gas and to hit the appropriate wavelengths with the McPherson and Hirex.
Jun 19 1997 08:57:46:600AM	970619001	Bruce Lipschultz	Shot # 970619001 Gas injection species none inj. time pulse width gas pressure Comments: fizzle
Jun 19 1997 10:02:28:940AM	970619002	Bruce Lipschultz	gas injection species none inj. time pulse width gas pressure Comments: plasma, no Prisma
Jun 19 1997 10:02:53:220AM	970619003	Bruce Lipschultz	gas injection species none inj. time pulse width gas pressure Comments: no plasma
Jun 19 1997 10:03:15:370AM	970619004	Bruce Lipschultz	gas injection species none inj. time pulse width gas pressure Comments: no plasma
Jun 19 1997 10:30:47:030AM	970619005	Bruce Lipschultz	shot 970619005 gas injection species none inj. time pulse width gas pressure Comments: plasma, RGA data obtained.
Jun 19 1997 10:33:17:120AM	970619006	Bruce Lipschultz	Shot# 970619006 gas injection species Ar inj. time .3 seconds pulse width .03 gas pressure 4 PSI Comments: no plasma
Jun 19 1997 11:30:41:520AM	970619007	Bruce Lipschultz	Shot 7 gas injection species inj. time pulse width gas pressure Comments: fizzle
Jun 19 1997 01:01:55:180PM	970619014	Bruce Lipschultz	shot 14: gas injection species Ar, J-bottom piezo inj. time .3 pulse width .03 gas pressure 4 PSi Comments: Good shot, Ar did not get in, piezo sticking? Next shot add another valve (B-side lower) with 4 PSi as well.
Jun 19 1997 01:14:54:060PM	970619015	Bruce Lipschultz	Shot 15 gas injection species Ar, J-bottom & Bisde lower inj. time .3 sec & .6 sec pulse width .03 sec & .03 sec gas pressure 4 psi & 4 PSI Comments: shot good. Prisma saturated. Retake and try again
Jun 19 1997 01:31:28:970PM	970619017	Bruce Lipschultz	Shot 17 gas injection species Ar through B-side lower inj. time .3 sec pulse width .02 seconds gas pressure 4 PSI Comments: good shot, Prisma data ok. J-bottom still not working. nl04 =.9e20.
Jun 19 1997 02:08:09:200PM	970619019	Bruce Lipschultz	Shot 19 gas injection species Ar through B-side lower inj. time .3 sec pulse width .02 seconds gas pressure 4 PSI Comments: good plasma, nl04=1.2 but no Prisma, repeat. Got probe scans
Jun 19 1997 02:10:06:340PM	970619020	Bruce Lipschultz	Shot 20 gas injection species Ar through B-side lower inj. time .3 seconds pulse width .02 sec gas pressure 4 PSi Comments: good plasma. FSP plume shot. Prisma data good. next shot higher density
Jun 19 1997 02:45:47:910PM	970619022	Bruce Lipschultz	Shot 22 gas injection species Ar thru b-bottom-lower inj. time .3 sec pulse width .02 sec gas pressure 4 PSI Comments: good shot, Prisma data, partial detachment on probes 4&5 correlating with large increases in Li-like Ar in the core.
Jun 19 1997 03:01:19:670PM	970619023	Bruce Lipschultz	Shot 23 gas injection species none inj. time pulse width gas pressure Comments: shot fine but diruption at .88 seconds. nl04= 1.3e20, switch to N2
Jun 19 1997 03:39:19:160PM	970619026	Bruce Lipschultz	Shot 26 gas injection species N2 J-bottom inj. time .7 seconds pulse width .03 gas pressure 8 PSI Comments: disruption at .95 seconds., no FSP, Prisma ok, no N seen incore (or divertor?)
Jun 19 1997 04:09:45:930PM	970619029	Bruce Lipschultz	shot 29 gas injection species N2 J-bottom inj. time .7 seconds pulse width .08 gas pressure 8 PSI Comments: nice shot. Prisma and McPherson got a good signal. nl04=1.2e20.
Jun 19 1997 04:28:23:930PM	970619031	Bruce Lipschultz	Shot 31 gas injection species none inj. time pulse width gas pressure Comments: baseline shot. disrupted at 0.6 seconds

Physics Operator Comments
Jun 19 1997 06:36:01:750AM		Steve Wolfe	To start, Hybrid ENABLE on B-top, K-side, and B-side-upper, but NOT on B-side-LOWER. Also, plenum output valves on both B-side-UPPER and J-BOT should be open. Gate valves: VUV,ECE,PCX, TCX, assuming the relevant vacuums are ok. Run plan: -------- The purpose of this run is to determine where the "screened fraction" of injected impurities (the part that never shows up in the core) goes, and to investigate the role of core transport on the penetration factor for injected impurities. Impurity gas puffing (Ar, N2, and He3) from J-bottom will be used to obtain ohmic plasma data at several densities, all at 1MA. We'll use a shot from Tuesday as a basis, probably 970617031. The initial density setting will be 0.8e20 (NL4), then raise the density to get detachment. After a background shot with no impurity puff, the first impurity gas will be Argon, using J-bot plenum (PG2) and a pulse time (0.3) and width of 30msec The B-side lower will not be used for these first shots. After several densities with Argon puffing (attached to detached), change to N2 puff from J-bottom, then He3. RF should piggyback during the run. RF timing should be 0.5 to 0.7 sec.
Jun 19 1997 06:37:22:600AM		Steve Wolfe	Side issues: ----------- Try to improve startup robustness. Some ideas include re-symmetrizing the EF2's, and changing the EF2 voltage and/or current ramp rate to affect the index in the first 20msec. Perhaps try some Ip control in seg1. Work on rampdown: maybe try a zero-voltage decay. Watch the hybrid wavegen glitch (and hope to never see it again).
Jun 19 1997 06:55:50:130AM		Steve Wolfe	Load from PCS 970617031 and make the following changes Change nl_04 to 8e19 Drop pre-puff from 29->22 msec Delay PG3 last zero point from .008 to .013 Remove existing pg2 pulse at .5sec (will put in Ar pulse at 0.3 sec for second shot, none for first) Note that Br_0 offset is at .0075; leave it for now. Load at 19-Jun-1997 06:55:27.00
Jun 19 1997 07:08:45:330AM		Steve Wolfe	coldstart done 19-JUN-1997 06:58:00.23 Logfile looks ok.
Jun 19 1997 05:07:47:010PM		Steve Wolfe	Run Plan: -------- Run Plan for Thursday, 970619 MP#167 Impurity Compression and Transport SL: Blip PO: wolfe Engineering setup: ------------------ Power system as for 970617031 Gas setup: B-top 5psi D2 K-side 20psi D2 B-side lower 4psi Argon J-Bottom 4psi Argon (J-bottom) Note: On Wed. night, Tommy purged the B-side upper plenum with D2 and filled it to 12.4 PSI of He3, then disabled SG6 again, as well as PUR1, so the only access to the plenum is P1IN. This should not be touched before the run; we will need to put some of the He3 from B-side upper to J-bot later in the run.
Jun 19 1997 05:11:39:240PM		Steve Wolfe	Run Plan: -------- Run Plan for Thursday, 970619 MP#167 Impurity Compression and Transport SL: Blip PO: wolfe Engineering setup: ------------------ Power system as for 970617031 Gas setup: B-top 5psi D2 K-side 20psi D2 B-side lower 4psi Argon J-Bottom 4psi Argon (J-bottom) Note: On Wed. night, Tommy purged the B-side upper plenum with D2 and filled it to 12.4 PSI of He3, then disabled SG6 again, as well as PUR1, so the only access to the plenum is P1IN. This should not be touched before the run; we will need to put some of the He3 from B-side upper to J-bot later in the run. -
Jun 19 1997 08:40:59:550AM	970619001	Steve Wolfe	Shot 1: Load from PCS 970617031 and make the following changes Change nl_04 to 8e19 Drop pre-puff from 29->22 msec Delay PG3 last zero point from .008 to .013 Remove existing pg2 pulse at .5sec (will put in Ar pulse at 0.3 sec for second shot, none for first) Note that Br_0 offset is at .0075; leave it for now. Getting a small mass 40 increase starting at 8:09 on RGA; F-port? Fizzle. bd at 6.3msec, Br is negative. EF4 imbalance is opposite to normal.
Jun 19 1997 08:42:52:350AM	970619001	Steve Wolfe	Shot 1: TWF has determined that the hybrid problem was due to the bitbus wavegen init happening before the CAMAC decoder init. After I suggested this possibility he checked the log files from yesterday and determined this was the case on the bad shots. He has now put in a conditional wait on the bitbus inits to force them to init later.
Jun 19 1997 09:21:10:470AM	970619002	Steve Wolfe	Shot 2: repeat with EF4's (hopefully) cold plasma to 1.67sec Missing three jk bp coils, efit didn't run because of Mag_traq2 error. TWF recovered, re-run efit and mflux Null still has some negative br cell access to unjimmy the new plenum valves, now that Yuri has updated the paragon logic Have to repeat this background shot because the prisma didn't trigger.
Jun 19 1997 09:33:06:960AM	970619003	Steve Wolfe	Shot 3: repeat with EF4's (hopefully) cold [nominally 179/185] fizzle: late bd 8msec. Bz now looks somewhat negative, Br is better... next shot: EF4 more positive by 10A (-1325->-1315)
Jun 19 1997 09:40:25:140AM	970619004	Steve Wolfe	Shot 4: EF4 more positive by 10A (-1325->-1315) fizzle. late bd. Now it looks too positive! put it back to -1325
Jun 19 1997 10:29:07:600AM	970619005	Steve Wolfe	Shot 5: put ef4 back to -1325, raise pre-puff to 25msec wait for coils to cool back down; we've been 40minutes since last attempt! plasma to 1.67sec; bd at 5.8msec next shot puff argon from Jbot
Jun 19 1997 10:35:53:310AM	970619006	Steve Wolfe	Shot 6: Argon puff from PG2 (JBOT) in seg2 for .030 @0.300 fizzle followed by tf crowbar. slightly late bd (7.5msec) I'm going to try "fixing" the startup
Jun 19 1997 11:27:17:050AM	970619007	Steve Wolfe	Shot 7: copy ef1L seg1 waveform to EF2U (re-symmetrize them) Argon puff from PG2 (JBOT) in seg2 for .030 @0.300 another long wait to check and replace fuses in TF, and hipot. IGT filament 1 is now flaking out (trips out after a few sec); fil2 is dead. Need a cell access to switch to the backup gauge (which doesn't have a direct view of the plasma!) Gage switched; it reads 7.9e-7 and rising (needs to outgas). Down to 4.9e-7 at INIT. Tommy reports both filaments on the old gage read ok to an ohmeter; could be a controller or connector problem. Will check after run. 11:20 and we've had 6 shots and only two plasmas! fizzle. bd at 7.5msec null looks fair, not so much evolving br.
Jun 19 1997 11:41:06:770AM	970619008	Steve Wolfe	Shot 8: a little more oh1 voltage early (5 to 10msec) fizzle, bd at 6.3msec, 40KA. Now br is evolving positive.
Jun 19 1997 11:48:33:310AM	970619009	Steve Wolfe	Shot 9: ef4 from -1325 to -1335A fizzle, late bd.
Jun 19 1997 11:56:01:920AM	970619010	Steve Wolfe	Shot 10: ef4 from -1355 back to -1325A; raise pre-puff to 28msec fizzle. bd @6.9msec,45kA. Try RCUR offset trick.
Jun 19 1997 12:02:33:200PM	970619011	Steve Wolfe	Shot 11: rcur offset from 6600 -> 6500 dud. I give up, try reloading seg1 from shot 5
Jun 19 1997 12:11:52:660PM	970619012	Steve Wolfe	Shot 12: reload seg 1 from shot 5, which went, and hope fizzle. bd @6msec. Why doesn't it take off? br looks bad, bz seems to be coming in too slowly, but the indication is it's moving inside?
Jun 19 1997 12:20:09:990PM	970619013	Steve Wolfe	Shot 13: br offset from .0075 to .008 dud, try going the other way.
Jun 19 1997 01:03:13:250PM	970619014	Steve Wolfe	Shot 14: br offset from .008 to .007 Long delay for server hangup, couldn't find T&J Finally, a plasma. couple of injections, they don't see any Argon ()&)$#*)*$ 1.5MW of RF, and a dithering h-mode
Jun 19 1997 01:09:09:860PM	970619015	Steve Wolfe	Shot 15: Add a pg1 puff at .6sec, 30msec plasma 1.53 sec b-side lower gives saturation on Ar signal, nothing from first pulse
Jun 19 1997 01:18:53:480PM	970619016	Steve Wolfe	Shot 16: move pg1 puff at .3sec, 20msec pg2 to .6sec, 50msec can't get three in a row! fizzle, very late bd 14msec
Jun 19 1997 01:27:32:260PM	970619017	Steve Wolfe	Shot 17: No changes move pg1 puff at .3sec, 20msec pg2 to .6sec, 50msec ion gage is acting very flakey in INIT plasma 1.58sec bd at 5.7sec still nothing from Jbot valve. Bside lower is ok.
Jun 19 1997 01:37:50:210PM	970619018	Steve Wolfe	Shot 18: Increase nl04 to 1.3e20 fizzle bd at 5.6msec,
Jun 19 1997 02:02:33:270PM	970619019	Steve Wolfe	Shot 19: change to 20psi of D2 in J-bot. , increase pg2 width to 100msec Increase nl04 to 1.3e20 plasma to 1.45sec, nl=1.2e20 unclear if anything vcame from j-bot, there is some drop in demand at the right time goetz didn't get data, just repeat.
Jun 19 1997 02:06:53:620PM	970619020	Steve Wolfe	Shot 20: No changes plasma to 1.45 sec go on to next density
Jun 19 1997 02:16:57:340PM	970619021	Steve Wolfe	Shot 21: nl04 to 1.5e20 add a second j-bot pulse at .79sec to .91sec (roughly) fizzle late bd, 11msec just go again.
Jun 19 1997 02:28:45:540PM	970619022	Steve Wolfe	Shot 22: increase nl04 to 1.7e20 (go for it, need to get a detached case). add a second j-bot pulse at .79sec to .91sec (roughly) plasma - 1.36sec, nl4= 1.4e20 looks like the jbot valve is getting conditioned.
Jun 19 1997 02:52:27:190PM	970619023	Steve Wolfe	Shot 23: take a background = no enable on B-side-lower IGT is dead again, both filaments; it must be the controller or the cable. Leave it off, see if we can run at all. Need to get Yuri or Joe to bypass the fill fault so it will enable the valves. still need to bypass torvac at the state machine plasma - disruption at around .88sec
Jun 19 1997 03:12:15:650PM	970619024	Steve Wolfe	Shot 24: pg2 (jbot) to 8psi N2, 30msec pulse at .7sec pg1 (b-side lower) 20psi D2+3.75psi Ar, 100msec at .6sec Purging the Ar would take too long, and we seem to need the extra puff; however this is going to be a lot of Ar. fizzle. bd at 11msec
Jun 19 1997 03:22:13:500PM	970619025	Steve Wolfe	Shot 25: go again, but chicken out on the pg1 pulse pg2 (jbot) to 8psi N2, 30msec pulse at .7sec Get rid of the pulse pg1 (b-side lower) 20psi D2+3.75psi Ar Purging the Ar would take too long, and we seem to need the extra puff; however this is going to be a lot of Ar. fizzle. 55ka, late bd (10msec)
Jun 19 1997 03:36:29:360PM	970619026	Steve Wolfe	Shot 26: ef4 from 1325 to 1330 (just to do something). pg2 (jbot) to 8psi N2, 30msec pulse at .7sec plasma, disrupts at around .92sec bd around 9msec (still late) h-modes during rf around .6sec
Jun 19 1997 03:46:43:130PM	970619027	Steve Wolfe	Shot 27: back to 20msec Ar at .3sec from pg1 60msec pg2 N2 pulse @0.7sec back off nl4 demand to 1.4e20 (all we're getting anyway) dud!
Jun 19 1997 03:52:43:270PM	970619028	Steve Wolfe	Shot 28:increase pre-puff to 28msec back to 20msec Ar at .3sec from pg1 60msec pg2 N2 pulse @0.7sec back off nl4 demand to 1.4e20 (all we're getting anyway) fizzle. bd at 10msec
Jun 19 1997 04:02:11:900PM	970619029	Steve Wolfe	Shot 29: go to 80msec on N2 puff, back off nl4 to 1.2e20 plasma to 1.46sec, nl4 =1.1e20 bd at 7.1msec
Jun 19 1997 04:15:10:670PM	970619030	Steve Wolfe	Shot 30: Baseline shot, disable and purge b-side lower and jbot. dud. Null doesn't look bad,
Jun 19 1997 04:23:31:800PM	970619030	Steve Wolfe	Shot 30: no change Baseline shot, disable and purge b-side lower and jbot. plasma disrupts at .57sec they think it's ok for a baseline! disruption looks like an injection,
Jun 19 1997 04:34:37:400PM	970619032	Steve Wolfe	Shot 32: 4psi Ne through jbot (60msec pulse @0.3sec) fizzle, 45ka, bd @7.5msec, CII at .01mW/cm2/ster
Jun 19 1997 04:41:59:890PM	970619033	Steve Wolfe	Shot 33: no changes 4psi Ne through jbot (60msec pulse @0.3sec) another fizzle. CII down to .007, bd at 7msec
Jun 19 1997 04:49:32:260PM	970619034	Steve Wolfe	Shot 34: no changes 4psi Ne through jbot (60msec pulse @0.3sec) another fizzle, late bd (9msec)
Jun 19 1997 04:55:57:800PM	970619035	Steve Wolfe	Shot 35: Rcur offset from 6600 to 6500 4psi Ne through jbot (60msec pulse @0.3sec) fizzle, later bd 12msec Try the other direction for the last shot.
Jun 19 1997 05:02:51:720PM	970619036	Steve Wolfe	Shot 36: Rcur offset from 6500 to 6700 (opposite direction to 35) 4psi Ne through jbot (60msec pulse @0.3sec) fizzle, another late 12msec breakdown.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:34:25:730AM	Plasma	Ok
2	08:56:27:120AM	Plasma	Ok
3	09:25:39:280AM	Plasma	Ok	no faults
4	09:35:37:010AM	Plasma	Ok	no faults
5	10:19:45:280AM	Plasma	Ok	no fault
6	10:30:18:480AM	Plasma	Ok	self powered TF #3 fault
7	11:20:55:050AM	Plasma	Ok
8	11:33:53:410AM	Plasma	Ok
9	11:44:55:470AM	Plasma	Ok
10	11:52:14:240AM	Plasma	Ok
11	12:00:12:680PM	Plasma	Ok
12	12:07:20:730PM	Plasma	Ok
13	12:17:46:580PM	Plasma	Ok
14	12:52:16:270PM	Plasma	Ok
15	01:03:44:740PM	Plasma	Ok
16	01:14:13:010PM	Plasma	Ok
17	01:21:25:260PM	Plasma	Ok
18	01:32:19:200PM	Plasma	Ok
19	01:53:05:900PM	Plasma	Ok
20	02:02:19:780PM	Plasma	Ok
21	02:13:46:090PM	Plasma	Ok
22	02:21:54:890PM	Plasma	Ok
23	02:44:59:910PM	Plasma	Ok
24	03:09:49:120PM	Plasma	Ok
25	03:18:06:700PM	Plasma	Ok
26	03:27:19:340PM	Plasma	Ok
27	03:42:04:300PM	Plasma	Ok
28	03:49:16:490PM	Plasma	Ok
29	03:56:44:620PM	Plasma	Ok
30	04:09:31:530PM	Plasma	Ok
31	04:17:32:000PM	Plasma	Ok
32	04:31:26:950PM	Plasma	Ok
33	04:38:42:240PM	Plasma	Ok
34	04:45:27:600PM	Plasma	Ok
35	04:52:30:300PM	Plasma	Ok
36	04:59:06:700PM	Plasma	Ok