Miniproposals

Miniproposal: 170a Date Filed: 5/13/1997 Title: Restart Operation: May 1997 First Author: Robert Granetz Session Leader: Steve Wolfe (shots 1-40)

Engineering Operator Run Comment

Start Up /Granetz,Wolfe/Bertolino,Silva

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Physics Operator Summaries

Entered: Jul 7 2004 04:36:56:833PM

Author: To Be Determined

Physics operator's summary for run 970515 MP#170A Restart Operation: May 1997 SL: Wolfe PO: Granetz EO: Bertolino, Silva Summary: Not much of an improvement over yesterday. The fizzle-to-dud ratio was significantly higher, but only three shots had appreciable current rises. I can't identify any obvious problems, other than the plasmas that we did get were obviously dirty and disruptive. Power supplies worked well until a couple of crowbars occurred late in the afternoon. Camac errors on both the engineering and magnetics highways began cropping up late in the afternoon as well. Raising the toroidal field to 5.9 tesla didn't seem to help things at all. Plasma shots: 002, 023, 037 Scorecard: 3 plasmas (all rather short duration, 2 disruptions) 24 fizzles 12 duds (2 due to power supply faults) 1 power supply test ---------- 40 total ------------------------------------------------------------------------------ Run Plan for Thursday, 970515: We will pick up where we left off on Wednesday. All indications are that the tokamak could use a good cleaning, but other than that, all systems seem to be in working order. ECDC will be done overnight prior to the run. If we are successful at obtaining 0.6 MA full length shots, then Ip will be raised to 0.8 MA. Engineering setup for Thursday 15 May 1997 Discharge clean in deuterium overnight. Engineering setup as on 970514026 (high pre-charge case). TF on PLC control. Gas setup - hybrid enable B-top and K-side (aka A-side) fill K-side with 20 PSI of D2 fill B-top with 5 PSI of D2 fill B-side-lower with 4 PSI of Ar All of the usual gate valves should be enabled, assuming no vacuum problems with the corresponding diagnostics. ------------------------------------------------------------------------------- Detailed shot log: Shot 01 -- First "shot" was a no-power test of the TF scanner Shot 02 -- Plasma, disrupted at t=0.33 s. Ip flattopped at 0.6 MA. Succeeding in becoming diverted. Density reached nl_04=1.5e20 m-2 (demand is for 0.9e20). ECE says 250-300 eV, but that doesn't seem right, given that the loop voltage drops to 2 volts. This disruption went upwards, Ihalo_U=45 kA. Shot 03 -- Dud. (No changes were made from previous shot.) Null looks good. Shot 04 -- Fizzle. Very weak, very late. Keep banging away. No changes. Shot 05 -- Fizzle. A little earlier. Next shot: increase pre-pulse gas puff width from 24 to 26 ms. Shot 06 -- Fizzle. Breakdown at 11 ms. Data acquisition is taking a long time. Shot 07 -- Fizzle. Somewhat stronger flash, and earlier (7 ms). Continue repeating. Shot 08 -- Fizzle. 5 in a row. No changes. Shot 09 -- Dud. Next shot: increase pre-pulse gas puff width from 26 to 28 ms. Shot 10 -- Dud. Next shot: reduce pre-pulse gas puff width from 28 to 20 ms. Shot 11 -- Fizzle. Nearly went. No changes for next shot. Shot 12 -- Dud. Next shot: raise Btor to 5.8 tesla (170 kA). Also increase pre-pulse width from 20 to 22 ms. Shot 13 -- Fizzle. Btor=5.9 T (TF starts at -1.2 s, instead of -1.0). Breakdown was late. Next shot: reduce gas puff to 20 ms. Shot 14 -- Fizzle. Almost was some current. No changes for next shot. Shot 15 -- Dud. Next shot, raise EF4 by 15 amps (+0.6 mT) Shot 16 -- Fizzle. Breakdown was a little earlier (11 ms). Next shot: raise EF4 another +10 amps. Shot 17 -- Dud. Next shot, remove 10 amps from EF4. Shot 18 -- Fizzle. Nearly went. Next shot: increase pre-pulse width to 22 ms. Shot 19 -- Fizzle. Next shot: increase pre-pulse width to 24 ms. Shot 20 -- Fizzle. Next shot: raise Br offset from .0065 to .007 T. Shot 21 -- Fizzle. No changes next shot. Shot 22 -- Fizzle. Next shot: raise Br offset from .007 to .0075 T. Shot 23 -- Plasma. No disruption, current ramped down starting after 0.1 s. All indications are that the plasma crashed to the inside. Why? Next shot: no changes. Probably will be a dud anyway. Shot 24 -- Fizzle. No changes next shot. Shot 25 -- Fizzle. That's 8 non-duds in a row. Does that count as progress? Next shot: raise TF another 5 kA (PLC to 175 kA). Shot 26 -- Dud. Next shot: no changes ... see if it recovers by itself. Shot 27 -- Dud. Next shot: return TF to 170 kA. Shot 28 -- Fizzle. Null is obviously affected by the extra 5 kA of TF. On Steve's suggestion, I'll add 60 volts to the early OH1 programming. Shot 29 -- Fizzle. Null has some radial field in it. Next shot: reduce Br offset from .0075 to .007 T Shot 30 -- Fizzle. Camac errors on engineering tree. Null still has a little positive Br. Next shot: reduce Br offset from .007 to .0065 T. Shot 31 -- Fizzle. Camac errors on engineering and magnetics. Can't reconstruct null. Joe Bosco and Bill Parkin are power cycling some of the highway drivers. Next shot: subtract 15 amps from EF4 (i.e. make it more negative). Shot 32 -- Dud. Null is so-so. We're just playing around in the dark now. For next shot: reduce pre-fill puff to 17 ms. Shot 33 -- No 13.8 kV power supplies fired. Shot 34 -- Dud. Next shot: reload shot 02 from this morning. Shot 35 -- PF breaker pulled out before commutation. Shot 36 -- Fizzle. Camac errors on engineering and magnetics. Can't reconstruct the null. No changes next shot. Shot 37 -- Plasma. Ip=0.6 MA, major disruption at 0.24 s. Didn't divert. No changes next shot. Shot 38 -- Fizzle. No changes next shot. Shot 39 -- Fizzle. Camac errors on some engineering. Next shot, reduce early gas puffing on pulse gas valve #3. Shot 40 -- Fizzle. TF crowbarred during the rampdown. Next shot: reduce pre-pulse pulse to 20 ms. There are a number of blown fuses in the TF supplies, which will take about a half hour to repair and check. In lieu of Keith Burrell being the speaker at the Physics Dept. Colloquium, starting at 16:15, we will cancel the run now.

Session Leader Comments
May 15 1997 08:11:23:310AM		Steve Wolfe	The plan for today is to pick up where we left off and try to get longer plasmas and more reliable current rises. If possible we'll bring the current up to 800kA.
May 15 1997 08:24:35:520AM	970515001	Steve Wolfe	Shot 1: data system only test shot, to check out tf scanner.
May 15 1997 08:47:28:350AM	970515002	Steve Wolfe	Shot 2: Plasma- 600kA to about 330msec. NL4 reaches 1.5e20 Goes diverted at about .26sec Loop voltage to around 2V; ECE says temp is only .3keV, but that has to be wrong. WPLASM from EFIT says 35kJ.
May 15 1997 08:51:36:440AM	970515003	Steve Wolfe	Shot 3: Dud
May 15 1997 08:57:41:610AM	970515004	Steve Wolfe	Shot 4: No changes- got a flash
May 15 1997 09:08:35:500AM	970515005	Steve Wolfe	Shot 5: No changes. fizzle. bd at 15msec.
May 15 1997 09:14:47:650AM	970515006	Steve Wolfe	Shot 6: More pre-puff. fizzle. Note: ITG is at 5.4e-7 before pulse.
May 15 1997 09:24:21:130AM	970515007	Steve Wolfe	Shot 7: another fizzle.
May 15 1997 09:34:37:420AM	970515008	Steve Wolfe	Shot 8: another fizzle. bd at 10msec.
May 15 1997 09:42:33:170AM	970515009	Steve Wolfe	Shot 9: No changes. We're going for the consecutive fizzle record. dud!
May 15 1997 09:47:51:670AM	970515010	Steve Wolfe	Shot 10: raise pre-puff to 28msec another dud.
May 15 1997 10:02:28:020AM	970515011	Steve Wolfe	Shot 11: lower pre-puff to 20msec fizzle. looks like it almost went.
May 15 1997 10:07:43:000AM	970515012	Steve Wolfe	Shot 12: No changes dud. Bob wants to raise the field.
May 15 1997 10:17:35:670AM	970515013	Steve Wolfe	Shot 13: Raise tf current to 170kA. fizzle. bd at 16msec
May 15 1997 10:25:51:840AM	970515014	Steve Wolfe	Shot 14: reduce gas puff. fizzle. bd at 15msec. A little bit of current.
May 15 1997 10:33:53:940AM	970515015	Steve Wolfe	Shot 15: repeat dud
May 15 1997 10:44:09:340AM	970515016	Steve Wolfe	Shot 16: tweak ef4 current more positive 15Amps fizzle. bd at 11msec
May 15 1997 10:53:08:440AM	970515017	Steve Wolfe	Shot 17: tweak ef4 current more positive again by 10Amps dud.
May 15 1997 11:02:03:520AM	970515018	Steve Wolfe	Shot 18: take the 10amps back out. fizzle. bd at 6msec. Looks like it tried to bounce.
May 15 1997 11:09:48:040AM	970515019	Steve Wolfe	Shot 19: raise pre-puff to 22 from 20. Granetz is pussy-footing around fizzle 8msec breakdown.
May 15 1997 11:25:09:900AM	970515020	Steve Wolfe	Shot 20: raise pre-puff to 24 fizzle. earlier bd. 6.6msec
May 15 1997 11:58:07:820AM	970515021	Steve Wolfe	Shot 21: tweak br to 7mT fizzle. similar bd 6.3msec Br looks about the same or even more negative.
May 15 1997 12:02:14:500PM	970515022	Steve Wolfe	Shot 22: no changes fizzle. bd at 8msec Br still looks negative to me.
May 15 1997 12:24:44:100PM	970515023	Steve Wolfe	Shot 23: Add another .5mT to Br (.0075) plasma - current drops fast after 115msec, moving in strongly. No apparent problems on any feedback signals; it seems to have really moved in. CAMAC problems on TRAQ2
May 15 1997 12:29:33:850PM	970515024	Steve Wolfe	Shot 24: repeat. fizzle. bd still early (6ms)
May 15 1997 12:35:04:530PM	970515025	Steve Wolfe	Shot 25: repeat. fizzle. bd at 10msec Now br looks a bit positive.
May 15 1997 12:43:47:850PM	970515026	Steve Wolfe	Shot 26: raise the tf to 175ka. dud.
May 15 1997 12:54:15:910PM	970515027	Steve Wolfe	Shot 27: "do nothing and see if it recovers by itself" - RSG dud
May 15 1997 01:05:53:330PM	970515028	Steve Wolfe	Shot 28: Drop tf back to 170kA fizzle. 6.5msec bd.
May 15 1997 01:32:01:210PM	970515029	Steve Wolfe	Shot 29: Wirehead time! make OH1V more positive by 60V between 5 and 30msec. Long delay to get IGOR straightened out. fizzle. bd at 9msec it has more +radial field, and more Bz.
May 15 1997 01:40:36:540PM	970515030	Steve Wolfe	Shot 30: Br to .007 (down .5mT) fizzle - Irby shouts "hey we got some Teflon" camac errors on buslv rog. traces. bd at 10msec looks like we still have some +Br early.
May 15 1997 01:51:58:190PM	970515031	Steve Wolfe	Shot 31: Br to .0065 (down .5mT) fizzle. bd @7msec camac errors on magnetics so I can't look at the null. Also camac error on EFC current trace
May 15 1997 02:07:30:830PM	970515032	Steve Wolfe	Shot 32: go 15a more negative on EF4 to compensate for oh1 voltage tweak. dud - should have gone the other way?
May 15 1997 02:14:04:220PM	970515033	Steve Wolfe	Shot 33: lower the gas to 17msec I predict another dud. No alternator supplies. Type 3 faults on all.
May 15 1997 02:22:12:410PM	970515034	Steve Wolfe	Shot 34: try again lower the gas to 17msec I predict another dud. I was right- another dud.
May 15 1997 02:52:16:510PM	970515035	Steve Wolfe	Shot 35: reload shot 2, but leave tf at 170kA. PF Breaker pulled out early, oh2l was first to go.
May 15 1997 03:09:13:000PM	970515036	Steve Wolfe	Shot 36: COMM faults on oh2l; no fuses blown. try again at repeating shot 2, at 5.9T fizzle. bd at 6.4msec, a couple of bounces. camac errors on buslv rogowskis
May 15 1997 03:24:32:610PM	970515037	Steve Wolfe	Shot 37: try again, hoping for magnetics data plasma: to 240msec, 600kA.
May 15 1997 03:29:38:320PM	970515038	Steve Wolfe	Shot 38: just repeat, get the dud out of the way. fizzle. bd at 6.4msec CII signal only at .017 mW/cm2/ster Amanda and Joe Snipes point out we had a locked mode on shot 37 from .104 to disruption time.
May 15 1997 03:34:52:800PM	970515039	Steve Wolfe	Shot 39: just repeat, again. fizzle - very similar to 38.
May 15 1997 03:48:24:500PM	970515040	Steve Wolfe	Shot 40: delay pg3 gas pulse to after 20msec tf crowbar at .56 seconds shot was a fizzle. bd at 7.8 msec First gas puff was delayed till 25msec; no effect on lack of current rise.

Physics Operator Comments
May 15 1997 08:24:38:480AM	970515001	Robert Granetz	Run Plan for Thursday, 970515 MP#170A Restart Operation: May 1997 SL: Wolfe PO: Granetz EO: Bertolino, Silva We will pick up where we left off on Wednesday. All indications are that the tokamak could use a good cleaning, but other than that, all systems seem to be in working order. ECDC will be done overnight prior to the run. If we are successful at obtaining 0.6 MA full length shots, then Ip will be raised to 0.8 MA. Engineering setup as on 970514026 (high pre-charge case). TF on PLC control. K-side to 20 psi D2 and B-top to 5 psi D2, with both enabled for hybrid control. All of the usual gate valves should be enabled, assuming no vacuum problems with the corresponding diagnostics.
May 15 1997 08:25:07:930AM	970515001	Robert Granetz	First "shot" was a no-power test of the TF scanner.
May 15 1997 08:47:29:430AM	970515002	Robert Granetz	Shot 02 -- Plasma, disrupted at t=0.33 s. Ip flattopped at 0.6 MA. Succeeding in becoming diverted. Density reached nl_04=1.5e20 m-2 (demand is for 0.9e20). ECE says 250-300 eV, but that doesn't seem right, given that the loop voltage drops to 2 volts.
May 15 1997 08:49:42:370AM	970515002	Robert Granetz	This disruption went upwards, Ihalo_U=45 kA.
May 15 1997 08:54:33:640AM	970515003	Robert Granetz	Shot 03 -- Dud. (No changes were made from previous shot.) Null looks good.
May 15 1997 09:02:45:410AM	970515004	Robert Granetz	Shot 04 -- Fizzle. Very weak, very late. Keep banging away. No changes.
May 15 1997 09:11:52:300AM	970515005	Robert Granetz	Shot 05 -- Fizzle. A little earlier. Next shot: increase pre-pulse gas puff width from 24 to 26 ms.
May 15 1997 09:14:08:520AM	970515005	Robert Granetz	EF1L voltage is looking good...much less ripple than yesterday.
May 15 1997 09:19:16:780AM	970515006	Robert Granetz	Shot 06 -- Fizzle. Breakdown at 11 ms. Data acquisition is taking a long time.
May 15 1997 09:26:46:200AM	970515007	Robert Granetz	Shot 07 -- Fizzle. Somewhat stronger flash, and earlier (7 ms). Continue repeating.
May 15 1997 09:36:43:900AM	970515008	Robert Granetz	Shot 08 -- Fizzle. 5 in a row. No changes.
May 15 1997 09:44:31:010AM	970515009	Robert Granetz	Shot 09 -- Dud. Next shot: increase pre-pulse gas puff width from 26 to 28 ms.
May 15 1997 09:48:59:850AM	970515010	Robert Granetz	Shot 10 -- Dud. Next shot: reduce pre-pulse gas puff width from 28 to 20 ms.
May 15 1997 09:59:43:430AM	970515011	Robert Granetz	Shot 11 -- Fizzle. Nearly went. No changes for next shot.
May 15 1997 10:09:43:440AM	970515012	Robert Granetz	Shot 12 -- Dud. Next shot: raise Btor to 5.8 tesla (170 kA).
May 15 1997 10:11:14:430AM	970515012	Robert Granetz	Also increase pre-pulse width from 20 to 22 ms.
May 15 1997 10:19:21:190AM	970515013	Robert Granetz	Shot 13 -- Fizzle. Btor=5.9 T (TF starts at -1.2 s, instead of -1.0). Breakdown was late. Next shot: reduce gas puff to 20 ms.
May 15 1997 10:27:08:280AM	970515014	Robert Granetz	Shot 14 -- Fizzle. Almost was some current. No changes for next shot.
May 15 1997 10:32:20:300AM	970515015	Robert Granetz	Shot 15 -- Dud. Next shot, raise EF4 by 15 amps (+0.6 mT)
May 15 1997 10:44:34:220AM	970515016	Robert Granetz	Shot 16 -- Fizzle. Breakdown was a little earlier (11 ms). Next shot: raise EF4 another +10 amps.
May 15 1997 10:53:58:380AM	970515017	Robert Granetz	Shot 17 -- Dud. Next shot, remove 10 amps from EF4
May 15 1997 11:01:09:320AM	970515018	Robert Granetz	Shot 18 -- Fizzle. Nearly went. Next shot: increase pre-pulse width to 22 ms.
May 15 1997 11:11:22:850AM	970515019	Robert Granetz	Shot 19 -- Fizzle. Next shot: increase pre-pulse width to 24 ms.
May 15 1997 11:25:55:680AM	970515020	Robert Granetz	Shot 20 -- Fizzle. Next shot: raise Br offset from .0065 to .007 T.
May 15 1997 11:58:10:830AM	970515021	Robert Granetz	Shot 21 -- Fizzle. No changes next shot.
May 15 1997 12:02:13:950PM	970515022	Robert Granetz	Shot 22 -- Fizzle. Next shot: raise Br offset from .007 to .0075 T.
May 15 1997 12:24:38:780PM	970515023	Robert Granetz	Shot 23 -- Plasma. No disruption, current ramped down starting after 0.1 s. All indications are that the plasma crashed to the inside. Why? Next shot: no changes. Probably will be a dud anyway.
May 15 1997 12:30:16:250PM	970515024	Robert Granetz	Shot 24 -- Fizzle. No changes next shot.
May 15 1997 12:36:04:590PM	970515025	Robert Granetz	Shot 25 -- Fizzle. That's 8 non-duds in a row. Does that count as progress? Next shot: raise TF another 5 kA (PLC to 175 kA).
May 15 1997 12:43:59:160PM	970515026	Robert Granetz	Shot 26 -- Dud. Next shot: no changes ... see if it recovers by itself.
May 15 1997 12:56:47:660PM	970515027	Robert Granetz	Shot 27 -- Dud. Next shot: return TF to 170 kA.
May 15 1997 01:08:52:200PM	970515028	Robert Granetz	Shot 28 -- Fizzle. Null is obviously affected by the extra 5 kA of TF. On Steve's suggestion, I'll add 60 volts to the early OH1 programming.
May 15 1997 01:33:00:790PM	970515029	Robert Granetz	Shot 29 -- Fizzle. Null has some radial field in it. Next shot: reduce Br offset from .0075 to .007 T
May 15 1997 01:41:55:230PM	970515030	Robert Granetz	Shot 30 -- Fizzle. Camac errors on engineering tree. Null still has a little positive Br. Next shot: reduce Br offset from .007 to .0065 T.
May 15 1997 01:59:05:910PM	970515031	Robert Granetz	Shot 31 -- Fizzle. Camac errors on engineering and magnetics. Can't reconstruct null. Joe Bosco and Bill Parkin are power cycling some of the highway drivers. Next shot: subtract 15 amps from EF4 (i.e. make it more negative).
May 15 1997 02:10:30:340PM	970515032	Robert Granetz	Shot 32 -- Dud. Null is so-so. We're just playing around in the dark now. For next shot: reduce pre-fill puff to 17 ms.
May 15 1997 02:16:38:310PM	970515033	Robert Granetz	No 13.8 kV power supplies fired.
May 15 1997 02:25:24:400PM	970515034	Robert Granetz	Shot 34 -- Dud. Next shot: reload shot 02 from this morning.
May 15 1997 02:33:50:640PM	970515035	Robert Granetz	Shot 35 -- PF breaker pulled out before commutation.
May 15 1997 03:09:42:740PM	970515036	Robert Granetz	Shot 36 -- Fizzle. Camac errors on engineering and magnetics. Can't reconstruct the null. No changes next shot.
May 15 1997 03:26:13:940PM	970515037	Robert Granetz	Shot 37 -- Plasma. Ip=0.6 MA, major disruption at 0.24 s. Didn't divert. No changes next shot.
May 15 1997 03:30:32:490PM	970515038	Robert Granetz	Shot 38 -- Fizzle. No changes next shot.
May 15 1997 03:40:43:190PM	970515039	Robert Granetz	Shot 39 -- Fizzle. Camac errors on some engineering. Next shot, reduce early gas puffing on pulse gas valve #3.
May 15 1997 03:50:20:450PM	970515040	Robert Granetz	Shot 40 -- Fizzle. TF crowbarred during the rampdown. Next shot: reduce pre-pulse pulse to 20 ms.
May 15 1997 03:59:09:930PM	970515040	Robert Granetz	There are a number of blown fuses in the TF supplies, which will take about a half hour to repair and check. In lieu of Keith Burrell being the speaker at the Physics Dept. Colloquium, starting at 16:15, we will cancel the run now.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	08:23:43:970AM	Test	Ok
2	08:33:28:430AM	Test	Ok
3	08:48:42:020AM	Test	Ok
4	08:56:09:540AM	Test	Ok
5	09:05:13:040AM	Test	Ok
6	09:12:56:810AM	Test	Ok
7	09:22:34:050AM	Test	Ok
8	09:30:18:780AM	Test	Ok
9	09:37:18:430AM	Test	Ok
10	09:46:17:520AM	Test	Ok
11	09:55:15:900AM	Test	Ok
12	10:05:13:620AM	Plasma	Ok
13	10:12:26:100AM	Plasma	Ok
14	10:21:08:640AM	Plasma	Ok
15	10:30:14:010AM	Plasma	Ok
16	10:39:24:110AM	Plasma	Ok
17	10:47:06:850AM	Plasma	Ok
18	10:56:23:620AM	Plasma	Ok
19	11:04:49:170AM	Plasma	Ok
20	11:20:14:390AM	Plasma	Ok
21	11:51:28:750AM	Plasma	Ok
22	11:58:32:380AM	Plasma	Ok
23	12:06:35:790PM	Plasma	Ok
24	12:23:52:800PM	Plasma	Ok
25	12:30:19:950PM	Plasma	Ok
26	12:39:02:140PM	Plasma	Ok
27	12:50:45:900PM	Plasma	Ok
28	01:00:26:780PM	Plasma	Ok
29	01:26:50:410PM	Plasma	Ok
30	01:34:23:390PM	Plasma	Ok
31	01:45:19:430PM	Plasma	Ok
32	02:01:34:880PM	Test	Ok
33	02:11:41:070PM	Test	Ok
34	02:20:22:700PM	Test	Ok
35	02:28:50:390PM	Plasma	Bad	oh2l fault
36	02:59:01:790PM	Plasma	Ok
37	03:17:09:760PM	Plasma	Ok
38	03:24:43:560PM	Plasma	Ok
39	03:31:37:170PM	Plasma	Ok
40	03:42:01:360PM	Plasma	Ok