| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Steve Wukitch |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Bill Parkin,Bill Byford,Ed Fitzgerald,Bill Byford,Ed Fitzgerald |
| Engineering Operator Run Comment |
| MP 298A Plasma Start up, MP 355 RF Conditionong. P.O. Wolfe |
| Session Leader Plans |
| Entered: Nov 4 2005 11:48:30:873AM |
| Author: Steve Wukitch |
| Engineering setup for Thursday 3-Nov-2005
MP298A Plasma startup and MP355 RF Conditioning Session leader: Wukitch Physics operator: Wolfe Overnight ECDC in D2, and bake at 60 C. Run begins at 09:00 and ends at 17:00 Power systems as on 1051102031 (1.0 MA fiducial, 5.4 T, lower single null, right gap 2 cm) A-coil configuration: normal [+Dtop -Dbot -Jtop +Jbot] and enabled. Gas Setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) leave NINJA as is DISABLED Enable the following gate valves and shutters: ECE, VUV, Z-bolo shutters Torvac setup: Gate valves open ICRF Setup: All transmitters to run-on by 8:30 am. Important Diagnostics: magnetics, Cu and Mo impurity spectroscopy, video monitors for antennas Plan: Continue machine cleanup, ICRF conditioning --------------------------------------------------------------------------- |
| Physics Operators Plans |
| Entered: Nov 2 2005 04:01:02:383PM |
| Author: Steve Wolfe |
Engineering setup for Thursday 3-Nov-2005 MP298A Plasma startup and MP355 RF Conditioning Session leader: ? Physics operator: Wolfe Overnight ECDC in D2, and bake at 60 C. Run begins at 09:00 and ends at 17:00 Power systems as on 1051102025 (1.0 MA fiducial, 5.4 T, lower single null) A-coil configuration: normal [+Dtop -Dbot -Jtop +Jbot] and enabled. Gas Setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) leave NINJA as is Leave DISABLED Enable the following gate valves and shutters: ECE, VUV, Z-bolo shutters Torvac setup: Gate valves open ICRF Setup: YES Important Diagnostics: magnetics, standard impurity spectroscopy Plan: Continue machine cleanup, ICRF conditioning (maybe including Jport). If we continue to have alternating fizzles, I may go back to the old 1050525002 startup and see if that's better than what Ian set up yesterday. |
| Session Leader Summaries |
| Entered: Nov 4 2005 11:48:45:060AM |
| Author: Steve Wukitch |
| Run summary:
Using 1 MA, LSN, fiducial discharges, we began conditioning the ICRF antennas into plasma. D antenna had reached ~1.3 MW yesterday but suffered an event that set it back late in the day. It had reconditioned to ~0.8 MW by the end of the day. E antenna continued to operate well up to 1.2 MW and appears to be in good condition for these discharges. E clearly causes D to fault and the situation becomes worse as the H fraction increases. J antenna was slowed by a malfunctioning stub tuner controller. The problem was ultimately traced back to a bad relay. Once this was corrected, we found the phase setting for 0,pi,0,pi to be near the last campaign value of ~320deg. Initial operation without a screen reached ~1.5 MW for short pulse and has been uneventful with respect to injections thus far. |
| Physics Operator Summaries |
| Entered: Nov 3 2005 05:40:46:770PM |
| Author: Steve Wolfe |
Some more progress today. The RF got J-port going, eventually J3 and J4 running together. Machine cleanup also progressed some, I suppose, although H/D rose through the day as we evolved more gas from plasma facing components and from the antennas. Shot#1 started at about 10%, rose to 30% during RF, and got into H-mode. Later in the day we were running up to H/D~0.4 or so, which is somewhat lower than yesterday. Startup reliability improved somewhat, but is still far from robust. We ended up with 19 plasmas in 33 attempts, all but one (#17) full length. Most were also free of runaways. I started out by returning to our old startup (1050525002) with increased pulsed gas, and modified it to higher oh1 voltage. Bz seemed to be drifting during the day and I made several tweaks to the IC_EF4U, getting as low as -1355 and ending up at -1345. The reason for this bad field behavior is not understood but it seems to be a fact. Some minor (<= .5mT) tweaks to Br0 may or may not have made any difference. Plasmas seemed most reproducible at high pre-puff, pg4 >= 25msec, which put the ratiomatic pressure around .06mTorr, rather on the high side by historical standards. Pressures below .05 resulted in some duds. After getting only two plasmas in the first 8 shots, I took 30 minutes of ecdc, which seemed to help; we then got 6 successful out of the next 8 tries. Every fizzle and dud caused the oh2u coax to go into the warning level above 2.5uOhm. Full length shots dropped the resistance back below 2uOhm, but not by much. Note that it seems better to reduce the fizzle delay on the OH2's to at least 300msec, as we had done yesterday. The engineers set this back to 500msec at the start of the day, which only resulted in higher dissipation and perhaps increased resistance readings. The point is that the OH2U swings the wrong way (more positive) on fizzles, because of the Zcur control, rather than double swinging which is the point of having the fizzle delay for oh1 and oh2l. While the joint dissipation never got above about 2kJ, the joint resistance situation is cause for some concern, and the sooner we get past these fizzles, or implement a digital fizzle detector algorithm that forces the currents to do the right thing, the better. Scorecard: ----------- Tests 0 Duds 5 Fizzles 9 Plasmas 19 ======== == Shots 33 |
| Session Leader Comments |
| Physics Operator Comments | |||
| Nov 3 2005 07:43:34:153AM | Steve Wolfe | RF has requested 2cm outer gap (compared to 1.5cm yesterday) I want to change the startup back to the old "magic" 1050525002 PCS setup: ----------- Seg1: Import 1050525002 recalculate all mag preds (note RCUR offset=1500) pg4 from 21msec to 25msec Seg2: RCUR from .6595 to .6570 Load/clean - get timestamp errors on p05,p09 in seg1 Move end points and reload; except I moved them in seg2 instead of seg1. Let's try that again. Load/clean - no errors this time Reset old values so PCS_compare doesn't squawk Load at 3-Nov-2005 07:42:57.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| Nov 3 2005 07:55:02:637AM | Steve Wolfe | RF has requested 2cm outer gap (compared to 1.5cm yesterday) I want to change the startup back to the old "magic" 1050525002 PCS setup: ----------- Seg1: Import 1050525002 recalculate all mag preds (note RCUR offset=1500) pg4 from 21msec to 25msec Seg2: RCUR from .6595 to .6570 Load/clean - get timestamp errors on p05,p09 in seg1 Move end points and reload; except I moved them in seg2 instead of seg1. Let's try that again. Load/clean - no errors this time Reset old values so PCS_compare doesn't squawk Load at 3-Nov-2005 07:42:57.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| Nov 3 2005 09:29:09:073AM | 1051103001 | Steve Wolfe | Shot#1: startup as on 1050525002, except for PG4 to 25msec I expect that the EF4 may be too positive (-1310) but will evaluate after the shot. Seg2 same as 1051102031, except RCUR moved in by 2.5mm to increase outer gap, per RF request. D&E (plus a little J4) will be tried on the first shot; #3 tuner/phase shifter is still having a problem. Result: plasma full length Nice breakdown time 6.5ms, good current rise, pressure is rather high at 55uTorr, Bz is somewhat positive. Small runaways early. Outer gap is 2cm as programmed, got a little over 2MW, solid H-mode for 100ms or so, then D faulted; E ran clean at 1.1MW till EOF. H/D 0.11 before RF, 0.2 to 0.3 during RF next shot: reduce pg4 3ms |
| Nov 3 2005 09:25:28:667AM | 1051103002 | Steve Wolfe | Shot#2: PG4 from 25 to 22msec p0 in check = 1.3e-6 Dud. I guess I shouldn't have dropped pg4 pressure was still .05mTorr, fields look fine (and the same); should have gone? next shot: pg4 back up |
| Nov 3 2005 09:44:05:793AM | 1051103003 | Steve Wolfe | Shot#3: PG4 from 22 to 25msec Another dud? Br0 looks a little negative, Bz is ramping pretty fast. next shot: Pg4 to 28msec, OH1_Volt up by 50V |
| Nov 3 2005 09:54:27:417AM | 1051103004 | Steve Wolfe | Shot#4: PG4 from 25 to 28msec, OH1_Volt from 150 to 200V before .02sec (first point from 120->170) fizzle. breakdown at 8.2msec. next shot: Br0 up .0003, EF4 down 15A |
| Nov 3 2005 10:14:47:793AM | 1051103005 | Steve Wolfe | Shot#5: Br0 to .0003, EF4 from -1310 to -1325 plasma full length breakdown is even later, at 10msec; decent current rise. Halpha is burning out nicely, CIII peaks around .011. Br looks better, Bz a bit slower, still ramping and rather positive at 10msec. E ran ok at 1.25MW, D-faulted immediately, J4 tried and failed. H/D ~0.2 to 0.3 next shot: repeat and see what happens |
| Nov 3 2005 10:37:26:810AM | 1051103007 | Steve Wolfe | Shot#7: Br0 to 0. from .0003 Dud? Br change is the only thing I see. We've been getting oh resistance warnings on OH2U. The engineers had set the OH2 fizzle detector delay to 500msec. We had changed this yesterday (per Irby) to 300msec, since this coil goes the wrong way on a fizzle and having a longer delay just forces it further. I have requested that it be set back to 300ms and may ask to have it reduced further. |
| Nov 3 2005 10:44:35:400AM | 1051103008 | Steve Wolfe | Shot#8: Br0 to .0005; I don't really think it's a Br issue, but that's all that changed. Another dud It's not the fields. Try 30 minutes of ecdc before next shot. |
| Nov 3 2005 11:39:40:497AM | 1051103009 | Steve Wolfe | Shot#9: Br0 back to 0., PG4 to 25msec 30 minutes of ecdc before this shot. 1.0e-6 at check plasma full length breakdown slightly late (~7msec) slight hesitation, Br looks a little low Got E at 1.25MW, J4 at .5MW, D faulting H/D .15 to .25 next shot: repeat |
| Nov 3 2005 11:45:13:323AM | 1051103010 | Steve Wolfe | Shot#10: repeat fizzle. late breakdown @9msec next shot: IC_EF4U to -1335 |
| Nov 3 2005 12:02:55:653PM | 1051103011 | Steve Wolfe | Shot#11: IC_EF4U to -1335 from -1325 Delay seg1 pg3 puff to after 30msec (wouldn't have mattered on 10) plasma full length bd at 6.7msec, nice burnout on H-alpha, no Ip hesitation. D still faulting, E ok at 1.25MW, J ok at 0.6MW Bolo almost as high on J pulse as E, despite half the power. next shot: repeat DNB is firing into machine between shots. |
| Nov 3 2005 12:14:44:060PM | 1051103012 | Steve Wolfe | Shot#12: reduce outer gap back to 1.5cm (RCUR from .657 to .6595) No startup changes DNB tried to fire into machine between shots, but gate valve wouldn't open. plasma full length. Two in a row! startup looks pretty much the same as 11; small runaway burst (1.5e12) early, otherwise ok. D was better, still faulting but ramped up to 0.5MW. E ran clean. J4 up to 0.7MW next shot: repeat |
| Nov 3 2005 12:29:39:183PM | 1051103013 | Steve Wolfe | Shot#13: repeat plasma full length bd a little earlier, 5.8msec Bz is down a tad. No runaways this time. D still ratty, E clean at 1.3, J4 at 0.7MW DNB will fire into the machine before next shot. No PCS changes |
| Nov 3 2005 12:45:34:310PM | 1051103014 | Steve Wolfe | Shot#14: repeat DNB gate valve opened between shots but beam did not fire, according to RSG. Then he tried again and it did, raising the pressure to 1e-5 (gauge) 1.7e-6 in check plasma full length bd back to 6.5msec, still no runaways. one injection ~0.9sec, during D pulse D doing better, ramps to 0.6MW, E and J as before. Also no neuts, the E port heating is now not visible. H/D is up to 0.4 late in the flattop. |
| Nov 3 2005 12:55:44:870PM | 1051103015 | Steve Wolfe | Shot#15: repeat plasma full length bd later this time, 7.7msec Br is a little more positive at t=0 D staggering up to 0.8MW, E and J as before. |
| Nov 3 2005 01:07:10:073PM | 1051103016 | Steve Wolfe | Shot#16: repeat fizzle. Time to go back to work. late breakdown 10msec and an injection (?) at .022sec next: Br0 to -.0003, ef4 down another 10A |
| Nov 3 2005 01:23:58:730PM | 1051103017 | Steve Wolfe | Shot#17: Br0 to -.0003, ef4 to -1345 from -1335 plasma disrupted at 1.2sec. Injection from ? bd at 7msec, no runaways. next: I should probably drop pg4, but I'll just go again and see... |
| Nov 3 2005 01:34:19:230PM | 1051103018 | Steve Wolfe | Shot#18: No changes fizzle, not robust to disruptions yet breakdown at 6.5msec, almost made it; if I'd dropped the pre-puff it probably would have gone through. Next: no change |
| Nov 3 2005 01:47:29:433PM | 1051103019 | Steve Wolfe | Shot#19: No changes another fizzle. Thought that one would be ok. bd at 7.5msec, br is a bit too negative? ratiomatic is actually down a little from the shots that went. Here we go again. Drop pg4 by 2ms, raise Br0 back to 0 |
| Nov 3 2005 02:11:26:247PM | 1051103020 | Steve Wolfe | Shot#20: pg4 from 25 to 23ms, Br0 back to 0 from -.0003 plasma full length. bd at 5.8ms, no hesitation, no runaways J and E clean, D still faulting but getting there. Bolo during J is now less than during E (though not by a factor of two) H/D rising from .25 to .4 during pulse The part for the J3 tuner has arrived. We will have a short delay while they install it. |
| Nov 3 2005 02:31:18:950PM | 1051103021 | Steve Wolfe | Shot#21: J3 is supposedly repaired. DNB is down with a stuck calorimeter. No PCS changes plasma full length bd at 6.7msec, ratiomatic .053mTorr no runaways. D and E look like they did on 20; so does J4; not much from J3, but Steve claims it's "baby steps" next: repeat |
| Nov 3 2005 02:44:26:980PM | 1051103022 | Steve Wolfe | Shot#22:repeat plasma full length. bd 6.5ms; startup looks the same as 21 D looks cleaner, one fault on the way up to 0.8 E clean at 1.3 J about the same. Prad seems to be climbing a little during E pulse next: repeat |
| Nov 3 2005 03:00:14:683PM | 1051103023 | Steve Wolfe | Shot#23:repeat plasma full length bd 7.3ms, a little later Br drifting up, Bz a little down D flat at 0.8MW, with a couple of trips J3 ramping up to 0.5, clean; J4 at 0.7 next: no changes, see if it gets better or worse. |
| Nov 3 2005 03:08:42:277PM | 1051103024 | Steve Wolfe | Shot#24:repeat base pressure seems to be up a little before this shot, 2.2e-6 at INIT, 1.8e-6 in check fizzle. Well, I guess I should have tweaked it. bd at 6.7ms, injection at 19ms, might have been sliding in at the time. next: drop Br, drop pg4 |
| Nov 3 2005 03:23:19:280PM | 1051103025 | Steve Wolfe | Shot#25:drop Br to -.0002, pg4 from 23 to 21ms hope it doesn't dud. oh2u resistance was down to 1.58uOhm on 24; it will probably be up over 3 this time. 1.0e-6 at check. Probably should have left pg4 alone. plasma full length, lots of runaways, over 10^14 equivalent. This one definitely bounced outside. bd at 5.8msec. D and E stacked, D faults out after 100ms or so Got about 2MW for a while. J3 faults at 0.7, J4 ok next: pg4 back to 23msec |
| Nov 3 2005 03:36:27:207PM | 1051103026 | Steve Wolfe | Shot#26:pg4 back to 23msec from 21 1.8e-6 in check this time Dud! Makes no sense. Br looks ok. Next: back to 25msec |
| Nov 3 2005 03:51:08:643PM | 1051103027 | Steve Wolfe | Shot#27:pg4 to 25msec from 23 fizzle. late breakdown 9msec looks like it chokes. Bz went up this time. next: ef4 down by 10A |
| Nov 3 2005 04:02:38:800PM | 1051103028 | Steve Wolfe | Shot#28:ef4 from -1345 to -1355 Br0 back to 0 plasma full length bd at 6ms, couple of small injections (or bounces?) but they don't affect the startup, no runaways. J3 was not on this time, D and E separated again. next: try for a repeat; J3 should be back on. |
| Nov 3 2005 04:15:59:160PM | 1051103029 | Steve Wolfe | Shot#29: repeat plasma full length bd at 7.1ms; Bz now a little negative. J3 .4MW, J4 .3MW D .8MW, E 1.1MW, very short overlap to get to ~2MW next: ef4 positive by 5A |
| Nov 3 2005 04:31:01:143PM | 1051103030 | Steve Wolfe | Shot#30: ef4 from -1355 to -1350 plasma full length early bd 5.5ms, no runaways. Bz still a little negative D has lots of faulting, E clean around 1.1MW J3 and J4 both faulting repeatedly OH2U down to 1.5uOhm, ~1kJ dissipation this time, hopefully down again next shot next: no changes |
| Nov 3 2005 04:42:39:473PM | 1051103031 | Steve Wolfe | Shot#31: no changes plasma full length bd 6.8ms, slight hesitation bz again a little negative D moved after 1sec, E off, D ratty at 0.8MW J3 and J4 together total 1.5MW, not quite balanced next: repeat |
| Nov 3 2005 04:59:33:737PM | 1051103032 | Steve Wolfe | Shot#32: no changes fizzle. extremely late bd, >15msec Bz went negative again, br maybe a little also ratiomatic is around .06mTorr Something is very screwed up with these fields. next: ef4 to -1345 |
| Nov 3 2005 05:12:16:190PM | 1051103033 | Steve Wolfe | Shot#33: ef4 to -1345 from -1350 Plasma full length. bd at 7msec, bounced outside, some runaways. I suppose it could have stood more positive Bz, but I'll take it. D ran clean at .75MW, J faulted completely. H/D starts around .2 and rises to .4 |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:07:25:840AM | Plasma | Ok | |
| 2 | 09:21:43:823AM | Plasma | Ok | |
| 3 | 09:34:45:480AM | Plasma | Ok | |
| 4 | 09:47:35:760AM | Plasma | Ok | |
| 5 | 10:01:50:433AM | Plasma | Ok | |
| 6 | 10:15:00:543AM | Plasma | Ok | |
| 7 | 10:28:38:107AM | Plasma | Ok | |
| 8 | 10:41:48:607AM | Plasma | Ok | |
| 9 | 11:28:47:043AM | Plasma | Ok | |
| 10 | 11:41:48:183AM | Plasma | Ok | |
| 11 | 11:54:47:310AM | Plasma | Ok | |
| 12 | 12:07:56:823PM | Plasma | Ok | |
| 13 | 12:23:32:073PM | Plasma | Ok | |
| 14 | 12:36:43:667PM | Plasma | Ok | |
| 15 | 12:49:52:777PM | Plasma | Ok | |
| 16 | 01:03:01:370PM | Plasma | Ok | |
| 17 | 01:16:33:213PM | Plasma | Ok | |
| 18 | 01:29:30:730PM | Plasma | Ok | |
| 19 | 01:42:33:777PM | Plasma | Ok | |
| 20 | 01:55:34:043PM | Plasma | Ok | |
| 21 | 02:25:20:933PM | Plasma | Ok | |
| 22 | 02:38:38:277PM | Plasma | Ok | |
| 23 | 02:51:46:573PM | Plasma | Ok | |
| 24 | 03:04:42:903PM | Plasma | Ok | |
| 25 | 03:17:32:900PM | Plasma | Ok | |
| 26 | 03:30:22:080PM | Plasma | Ok | |
| 27 | 03:43:11:690PM | Plasma | Ok | |
| 28 | 03:56:59:987PM | Plasma | Ok | |
| 29 | 04:09:52:393PM | Plasma | Ok | |
| 30 | 04:22:45:690PM | Plasma | Ok | |
| 31 | 04:35:52:080PM | Plasma | Ok | |
| 32 | 04:48:42:677PM | Plasma | Ok | |
| 33 | 05:01:33:050PM | Plasma | Ok | |