| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Jim Irby |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Gary Dekow,Bill Byford |
| Engineering Operator Run Comment |
| Plasma Startup, SL: Irby, PO: Wolfe, EO:Dekow/Byford |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:28:803PM |
| Author: To Be Determined |
| Run Summary for 1020619 Plasma Startup MP298A SL: Irby PO: Wolfe EO: Byford/Dekow We continued to clean up the machine today. The density was programmed to 7e19/m^2 to keep from over-gasing the plasma. During the early discharges most of the particles making up the plasma were coming from the walls. NL04 for example rose to nearly 1.5e20/m^2 on shot 05. After shot 09 we stopped for approx one hour to change the EF4 connections so that all the current was properly measured by the bus Rogowskis. We had been living with a 120 amp imbalance in the magnets. On shot 10 the imbalance was back to the 10 to 20 amp range. However, following this change, it took several duds and fizzles and field tweaks to get a very nice plasma on shot 17. By this point the density was almost under control and only rising to 8e19/m^2 before development of what looked like a MARFE beyond 1.1 s. On shot 21 we successfully started moving the plasma up towards a more double null configuration. Unfortunately, this was our last plasma. The remaining shots were either duds or fizzles. We also began running the DNB on shot 21, which may or may not have affected operation. The MARFE formation was also moving later and later into the shot as we cleaned up the machine. Generally a very good day in that we are now clearly cleaning up the machine and getting full length discharges. H_to_D was also improving during the day. It ranged from 20 down to 14% at 200 ms and was below 50% at 1.5 s. John Rice mentioned that the new tangential x-ray detectors are working well, and Howard says that the MSE signal looks very promising. The plasma shots: shot duration cii ---- ------- --- 03 0.39 .004 05 1.29 .005 07 1.30 .008 08 0.25 .008 09 1.73 .007 14 0.14 .008 17 1.68 .010 18 1.71 .011 20 1.69 .008 21 1.73 .006 |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:14:863PM |
| Author: To Be Determined |
| Physics Operator Summary for Wed 19-JUN-2002 SL: Irby PO: Wolfe EO: Dekow,Cochran,Byford MP: 298A C-Mod Plasma Startup Engineering setup ------------------ ECDC overnight in D2 at 2e-4 Torr, stopping by 8:00 am. We may want ECDC in D2 between shots. Run begins at 09:00 and ends at 17:00. Power systems the same as for shot 1020618012. Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) leave J-Bottom as is Hybrid DISABLED (PG5) Enable the following gate valves, assuming no vacuum problems: ECE, DNB ------------------------------------------------------------------------------- RF Setup: None ------------------------------------------------------------------------------- Run Plan: Continue startup struggles. If we get more reproducible plasmas, we will try to track down the EF4 imbalance problem. If we start getting plasmas through rampdown we will start the day 1&2 program of MP#298A. Start from 1020618012; a .6sec shot We may want ECDC in D2 between shots. We would like to have the TCI working. We will probably also puff some argon for HIREX Ti (and Te) measurements. Results: ------- An ok day, certainly not great, but progress was made. We ran ecdc for 5 minutes between shots all day. The machine does seem to be cleaning up. We had several 800kA plasmas run into ramp-down. H/D on these was le 0.5, and the density ran around 7e19 with no gas demand during flattop. On the other hand, the startup was not robust, losing us several shots at the end of the run after nearly full length pulses seemed established. The swap of the two J-bot connectors restored the apparently broken JK coils and a few of the GH coils. The weights for BP_14 and BP15 were put back on in \analysis::efit_efitin:fwtmp2 . Bob also put the original \BTOR loop back in. Unfortunately, on shot #6 BP16_JK died for real, probably due to the disruption on shot 5, and Bob had to change the processed BP_15 to use bp16_bc. BP16_JK was showing baseline jumps for the rest of the run. It's possible that tightening the connector might fix it again, but for now we can use bp16_bc. THe EF4 imbalance problem was understood and corrected, as described below. The Power Room UPS failed last night, and was placed in bypass for the run. This failure (possibly) was responsible for some CAMAC and PLC errors on shot#1 which resulted in a dud due to no EF4; the Chopper also misbehaved on #1 and the tf rogowski trace had a huge baseline offset. Service was called on the UPS, and when the tech arrived this afternoon the unit seemed to be working again. We left it bypassed, however, since no cause for the original failure was identified. After power cycling some PLC's and taking a test shot on the bus rogowskis, we ran an EF4 and EFC hybrid control test on shot #2, which was successful. Shot #3 was a short plasma, followed by a fizzle on #4, and a long (1.29s) plasma pn #5, another fizzle on 6, and plasmas on #7-9. #9 got to 1.63sec, well into rampdown. While this was going on, we reviewed the modification that had been made to the EF4 varistor connection with Bill Cochran, and determined that a current path had been introduced which allowed current in ef4L that would not show up on the EF4 bus rogowski, and actually went through the EF4U shunt. Some of the EF4L current also could go through the EF4U rogowski. This was the likely reason for the apparent large imbalances in the EF4 rogowski signals, and for the very different programming required on IC_EF4 to get good Bz. After shot #9, Bill restored the old varistor configuration, eliminating the unmeasured and mis-measured current paths. This resulted in very well balanced signals on the EF4U and EF4L bus rogowskis. However, it took more shots than expected to recover plasmas, and the startup was not as robust, although the fields looked good. Shots #10-12 were duds. I was adjusting IC_EF4, and shot #12 with IC_EF4=-1350 had nearly identical Bz to #9. Shot #13 was a fizzle, after a small Br tweak from .002 to .0025 . #14 dropped Br0 to .00225 and was a short plasma, which got into trouble around 100msec, and 15 was another dud. #16 was also a dud, with Br0 back to .002. For shot #17 Br0 dropped to .0015, and the dnb gate valve and zbolo-shutter were disabled. This shot ran to 1.68 sec. shot #18 was a repeat and ran a little longer. On #19 we re-enabled the bolo shutter, and got a dud. However, #20 was a repeat, with the shutter still open, and we got another 1.7 sec shot. For Shot #21 we lowered the upper xpoint by nearly 2cm, and got a nice long (1.73sec) plasma with elongation over 1.7 and nearly flat density. The dnb gate valve was re-enabled for this shot, but the beam didn't run. For shot #22 we programmed zcur to be 1cm higher (from -.015 to -.005), but shots #22-25 were all duds or fizzles. It may have been coincidence that the beam was firing on all of these, or it might not. Small changes in fields and gas puff did not recover a current rise. We never got the higher plasma position shot. At around shot 12 I discovered that the magnetics predictors had not been updated. Apparently when Bill or maybe Jim loaded from shot 1010801015 he ignored the warning about f24a being changed to f24. I recalculated the Br0 predictor for shot 13, but didn't get around to doing all of the others until shot #24 (seg 2 done for shot #22, the unused seg3 and 4 on shot #23). When I did seg 1 I found that there were two input mismatches, f24a and bp26_gh. After the run, Bob told me that on May 31, during power tests, he replaced bp26_GH with bp26_BC on input 55. Bp26_GH was the only one of the coils on the swapped J-bottom connectors that was being used. However, while Ian recalculated the predictors, and Bob made a logbook entry under magnetics, noone updated the hybrid config_id, so the config message did not reflect the change. Since BP26_GH is now back where it belongs, after the run Bob swapped these back, so BP26_GH is now on input_55, and we updated both the input_55 and config_id nodes. This means that all the predictors I changed will need to be redone tomorrow, but they would have had to be anyway if a shot before 22 got loaded. Scorecard ----------- Tests 1 Duds 9 (including 1 power supply dud) fizzles 5 plasmas 10 ======= == shots 25 |
| Session Leader Comments | |||
| Jun 19 2002 09:43:56:733AM | 1020619001 | Jim Irby | Took a test shot (no power) to check bus Rogowskis. Everything seems to be okay. |
| Jun 19 2002 10:51:13:523AM | 1020619005 | Jim Irby | near full length plasma (1.29 s) Density rises through out shot w/o gas input Carbon is lower (.006) HTOD 20% at 200 ms and rises to abt 60% at end of shot |
| Jun 19 2002 11:22:31:037AM | 1020619007 | Jim Irby | near full length plasma (1.30 s) Density rises through out shot w/o gas input Carbon .008 HTOD 16% at 200 ms and rises to 55% |
| Jun 19 2002 11:48:21:140AM | 1020619008 | Jim Irby | plasma, but only .25 seconds. Ratiomatic not turned on. HTOD 20% at 200 ms |
| Jun 19 2002 01:50:46:250PM | 1020619014 | Jim Irby | Lost plasma at 140 ms or so. Injections starting at 100 ms... |
| Jun 19 2002 03:05:36:993PM | 1020619017 | Jim Irby | Beautiful shot: 1.68 s Density almost under control HTOD 12% at 200 ms, peaking at 44% or so ----- gettting better? |
| Jun 19 2002 03:10:00:280PM | 1020619018 | Jim Irby | another very nice shot: 1.71 s HTOD abt 19% at 200 ms. Now has begun to roll over and fall until the MARFE developed. Peaking late at 50%. CII at .0011 --- not dropping very quickly |
| Jun 19 2002 03:46:20:040PM | 1020619020 | Jim Irby | Plasma for 1.69 s Carbon a little lower (.008) HTOD 14% at 200 ms, max of 43% late in discharge Next shot Steve will start heading for a double null discharge.... |
| Jun 19 2002 04:05:55:273PM | 1020619021 | Jim Irby | Plasma for 1.73 s Steve was able to move plasma up and begin approach to double null Carbon II down again (.0065) HTOD a little higher peaking at 50% Next shot we will continue moving plasma up... |
| Physics Operator Comments | |||
| Jun 19 2002 07:14:21:973AM | Steve Wolfe | Setting up for 1020619 run We had a fault in the power room UPS last night; still not fixed, but we can probably run without it. I'm going to try doing everything from the cmodws07 screen today, although if T&J don't get the updates on the Linux scopes working it may be painful. Doing coldstart on Spanna. rtnode -- data loaded, A matrix responds rtnode -- data loaded, M matrix responds rtnode -- data loaded, PID matrix responds RT_NODE Done Looks ok. Run PCS from VMSTERM on spanna (@cmod$Models:[hybrid]pcs) load-from 1020618012 note IC_EF4U=-1200, BR0 0ffset=.002 load into model | |
| Jun 19 2002 07:44:00:233AM | Steve Wolfe | Irby requests that we maximize shot count by reducing between-shot ECDC to five minutes. | |
| Jun 19 2002 08:33:50:707AM | Steve Wolfe | Reload the PCS shot with seg2 title changed to indicate correct field. | |
| Jun 19 2002 09:18:24:067AM | 1020619001 | Steve Wolfe | Shot #1: dud - no ef4, chopper funny, oh2l goes up after fizzle, because of long fizzle delay. |
| Jun 19 2002 09:35:16:900AM | 1020619001 | Steve Wolfe | Shot #1: TF rogowski signal has a huge positive baseline shift +335000 |
| Jun 19 2002 09:51:55:800AM | 1020619002 | Steve Wolfe | Shot #2: Chopper and EF4 test only (hybrid control) Looks ok, ef4 still has imbalance, but runs at program current efc looks ok. TF baseline ok. next shot: full shot, with tf and oh fizzle delays removed |
| Jun 19 2002 10:07:40:100AM | 1020619003 | Steve Wolfe | Shot #3: full shot attempt, with tf and oh fizzle delays removed plasma to .4sec, some hards on tv (HXray detector not installed) PF breaker pulled - oh1 after the disruption; self-power circuit fired It goes resistive around the time it diverts, ~.24sec density is low, |
| Jun 19 2002 10:16:18:950AM | 1020619003 | Steve Wolfe | Shot #4: increase pg4 puff from 21 to 23 msec Had to go to spanna screen, alt-shift isn't working on the linux screen! |
| Jun 19 2002 10:21:42:387AM | 1020619004 | Steve Wolfe | Shot #4: increase pg4 puff from 21 to 23 msec Had to go to spanna screen, alt-shift isn't working on the linux screen! fizzle - breakjdown slightly late 6.8msec, CII at .018mW/cm2/sr (was ~.005 on #3) |
| Jun 19 2002 10:52:00:010AM | 1020619005 | Steve Wolfe | Shot #5: ecdc for 5min, no pcs changes Bob switches btor signal back to the original btor loop. plasma to 1.29 sec, density rising from 0.7sec on, with no gas puff after .4sec H/D rises from .2 to .6 before the disruption. outer strike going above the nose. ef1U goes to the rail Figured out how to keep alt-mouse from doing things to the window, and it now works in PCS, so back to the linux screen. next shot: 5min ecdc, no pcs changes. |
| Jun 19 2002 11:00:55:247AM | 1020619006 | Steve Wolfe | Shot #6: no pcs changes fizzle, looks like a bouncer? early bd, bz may be down a tiny bit. next shot: 5 min ecdc, no pcs changes |
| Jun 19 2002 11:27:15:490AM | 1020619007 | Steve Wolfe | Shot #7: 5 min ecdc, no pcs changes plasma, to 1.30sec ; similar to 5, bad startup, 1 bounce, almost lost it. efit doesn't converge, bp15 (bp16jk) is broken; now it really is broken, doed during #6, although probably the doiruption on 5 did it in. Next shot: dnb permissive on for next shot. 5 min ecdc, no pcs changes. Bob will change bp_15 to bp16_bc |
| Jun 19 2002 11:46:12:047AM | 1020619008 | Steve Wolfe | Shot #8: dnb permissive on. 5 min ecdc, no pcs changes. Bob changed processed bp_15 to bp16_bc plasma - short and ugly 0.25 sec late bd, 7.8 sec traq 2 failed, so efit ran without it. ratiomatic was off, can't tell how much the dnb raised p0 next shot: repeat |
| Jun 19 2002 12:04:13:693PM | 1020619009 | Steve Wolfe | Shot #9: repeat plasma to 1.63 sec, into rampdown density rises from about 1sec (marfe?) loop voltage goes from 1.2 to 1.6V next shot: Gary and Bill will change the EF4 configuration back to what it used to be, eliminating the extra cble that doesn't pass through the bus rogowski; this means I'll have to adjust the startup. I'll guess a value of -1290, and see what we get. Zbolo shutter will be enabled for next shot. |
| Jun 19 2002 12:48:25:600PM | 1020619010 | Steve Wolfe | Shot #10: ICEF4 from -1200 to -1290; EF4 Varistors back to "normal" dud. Bz is a little positive, compared to shot 9 #9 #10 Bz[-.005] -.0048 -.0018 [0.] 0.0028 -.0012 [.010] .00009 .0036 next shot: IC_EF4 from -1290 to -1320 |
| Jun 19 2002 12:57:15:307PM | 1020619011 | Steve Wolfe | shot#11: IC_EF4U from -1290 to -1320 dud, must not have been enough of an increase give it another 30Amps |
| Jun 19 2002 01:23:15:097PM | 1020619012 | Steve Wolfe | shot#12 IC_EF4U from -1320 to -1350; increase pg4 to 26msec dud. BZ is almost identical to shot 9; br looks about .5mT more negative next shot: raise br0 from .002 to .0025; it's reporting invalid predictor. still has f24a? How did it get this way? call the alg, and then set the offset to .0025 also, raise fill again, to 28msec |
| Jun 19 2002 01:35:45:273PM | 1020619013 | Steve Wolfe | shot#13:raise br0 from .002 to .0025; also, raise fill again, to 28msec fizzle. bd at 6.3msec, bounces next shot: br0 back down to .00225 |
| Jun 19 2002 01:50:31:860PM | 1020619014 | Steve Wolfe | shot#14: br0 back down to .00225 short plasma, .14 sec, gets in trouble at seg switch. bd is late .0078 next shot: repeat |
| Jun 19 2002 02:10:41:133PM | 1020619015 | Steve Wolfe | shot#15: repeat, see if it happens again. dud! br0 is more positive again, bz looks about right next shot: br0 back to .002, |
| Jun 19 2002 02:19:04:447PM | 1020619016 | Steve Wolfe | shot#16: br0 back to .002, dud, not unexpected. next shot: br0 down to .0015 |
| Jun 19 2002 02:34:53:953PM | 1020619017 | Steve Wolfe | shot#17: br0 down to .0015 disable dnb and zbolo shutters. plasma, to 1.68sec nice and quiet. bd around 7msec, slightly late. density rises at ~1.1sec, no injections next shot: repeat |
| Jun 19 2002 03:12:50:630PM | 1020619018 | Steve Wolfe | shot#18: repeat plasma to 1.7sec. Almost identical. bd earlier, 5.4sec next shot: repeat, re-enable zbolo shutter. |
| Jun 19 2002 03:23:06:100PM | 1020619019 | Steve Wolfe | shot#19: repeat dud! Earl insists that the bolo shutter can't cause anything like this, but that was the only difference. fields look the same. next shot: no changes; if we get another dud, close it again. |
| Jun 19 2002 03:48:10:433PM | 1020619020 | Steve Wolfe | shot#20: repeat plasma to 1.7 sec again. beam on next shot. next shot: drop zxu from .048 to .03 also, lower pg4 from 28 msec to 24msec |
| Jun 19 2002 04:01:02:780PM | 1020619021 | Steve Wolfe | shot#21: drop zxu from .048 to .03 also, lower pg4 from 28 msec to 24msec plasma to 1.73; bd at 6.3 density is flatter. next shot: raise zcur from -.015 to -.005 |
| Jun 19 2002 04:17:18:307PM | 1020619022 | Steve Wolfe | shot#22: raise zcur from -.015 to -.005. While I'm at it do the predictor recalculations in seg 2. The only offsets are clearin 12700 and ip -23000. fizzle. bouncer, got to 42kA. bd at 5.3msec next shot: 10A more positive on EF4 |
| Jun 19 2002 04:30:58:063PM | 1020619023 | Steve Wolfe | shot#23: raise zcur from -.015 to -.005. 10A more positive on EF4 recalcualte mag predictors in seg3 and seg 4 (for future use) fizzle, another bouncer. next shot: raise pg4 by 2msec |
| Jun 19 2002 04:47:45:323PM | 1020619024 | Steve Wolfe | shot#24: raise zcur from -.015 to -.005. IC_ef4 from -1340 to -1330 raise pg4 by 2msec to 26msec. recalculate seg1 mag predictors; note that rcur is still using bp26gh (offset 5500) dud. must have gone the wrong way. next shot: ic_ef4u to -1360 |
| Jun 19 2002 05:05:21:303PM | 1020619025 | Steve Wolfe | shot#25: raise zcur from -.015 to -.005. ic_ef4u to -1360 (maybe I went the wrong way?) dud . Fields look ok, small negative radial field. I think it's a gas problem. Maybe something to do with the dnb, but I don't know what. Note that the dnb gate valve opened on 21, but beam dodn't fire. All the subsequent tries the beam went normally, and we either got duds or fizzles. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:12:36:220AM | Plasma | Bad | EF4 and Chopper didn't go |
| 2 | 09:48:58:610AM | Test | Ok | EF4 and Chopper test...Okay |
| 3 | 09:58:24:143AM | Plasma | Ok | |
| 4 | 10:17:25:543AM | Plasma | Ok | |
| 5 | 10:37:40:223AM | Plasma | Ok | |
| 6 | 10:57:11:700AM | Plasma | Ok | |
| 7 | 11:11:36:487AM | Plasma | Ok | |
| 8 | 11:35:57:370AM | Plasma | Ok | |
| 9 | 11:49:26:157AM | Plasma | Ok | |
| 10 | 12:39:29:410PM | Plasma | Ok | |
| 11 | 12:53:39:087PM | Plasma | Ok | |
| 12 | 01:07:42:390PM | Plasma | Ok | |
| 13 | 01:24:41:380PM | Plasma | Ok | |
| 14 | 01:40:21:543PM | Plasma | Ok | |
| 15 | 01:56:35:453PM | Plasma | Ok | |
| 16 | 02:12:16:367PM | Plasma | Ok | |
| 17 | 02:28:13:293PM | Plasma | Ok | |
| 18 | 02:51:20:523PM | Plasma | Ok | |
| 19 | 03:10:57:907PM | Plasma | Ok | |
| 20 | 03:35:08:990PM | Plasma | Ok | |
| 21 | 03:52:27:597PM | Plasma | Ok | |
| 22 | 04:12:13:190PM | Plasma | Ok | |
| 23 | 04:27:33:993PM | Plasma | Ok | |
| 24 | 04:42:43:283PM | Plasma | Ok | |
| 25 | 04:57:22:557PM | Plasma | Ok | |