Miniproposals

Miniproposal: 170a Date Filed: 5/13/1997 Title: Restart Operation: May 1997 First Author: Robert Granetz Session Leader: Steve Wolfe (shots 1-42)

Engineering Operator Run Comment

MP170A Restart Operation/Marmar/Bertolino,Silva

Session Leader Plans

Physics Operators Plans

Session Leader Summaries

Physics Operator Summaries

Entered: Jul 7 2004 04:36:57:223PM

Author: To Be Determined

From: PHYSOP::MARMAR Date: 19-MAY-1997 18:17:34 Subj: PHYSOP run summary; 970519 Physop Run Summary, 970519 PO Marmar EO Bertolino, Silva SL Wolfe Continuation of MP 170A, restart operations. After a slow start due to vessel temperature problems, we made progress on the cleanup, with a total of 7 plasma shots. The best of these, shot 32, was a .8MA shot which lasted 1.2 seconds, up until the beginning of current ramp-down. It was vertically unstable at the end. An attempt to fix this, by reducing clearin to -.01, was never tested; shot 40 did not last to end of flat-top. The plasma are still resistive and radiative, but somewhat less so than last week. At the start of the day, the pre-fill puff was moved to -3.3 seconds; Shot 3, which was the first plasma attempt, had a large fluorocarbon puff. After this, the pre-puff was moved to -.5 s, where it remained for the rest of the run. After the first plasma shot with current rise (shot 7), we had one fizzle, followed by 20 minutes of ECDC in D2. This was not obviously either beneficial or detrimental. During ECDC, mostly masses 18 and 20 were produced, presumably due primarily to D_2O. Plasmas were obtained on shots 7 0.3s 0.64MA 18 0.49s 0.60MA 22 1.0s 0.62MA 23 1.07s 0.62MA 29 0.21s 0.72MA 32 1.21s 0.81MA 40 0.62s 0.80MA The pre-fill puffs were generally smaller than those used last week. This parameter, along with the B_r offset, was tweaked through the day. Shot 35 displayed an anomalous hybrid behavior which did not recur in tests or the rest of the run. See Wolfe's logbook entries on this event. Scorecard: Tests 3 Plasma attempts 39 Plasmas 7 fizzles 11 duds 21

Session Leader Comments
May 19 1997 09:02:10:410AM		Steve Wolfe	There was a heat failure over the weekend that was not recognized until this morning. Apparently the scanner stopped updating at some point. The wall temperatures dropped to very negative (avg < -100C), and some ports froze up. We are having a delay while the walls warm back up.
May 19 1997 10:02:57:850AM	970519001	Steve Wolfe	shot 1: Tuesday test wall avg at -36C Camac failures again! DO it over.
May 19 1997 10:03:49:610AM	970519002	Steve Wolfe	shot 2: Tuesday test wall avg at -15C Test ok, go for plasma next shot.
May 19 1997 10:27:27:520AM	970519003	Steve Wolfe	shot 3: Try for plasma Loaded from 970516002, but Earl moved the gas puff way early (see run plan). Wall at +1C, P=1.6e-6 fizzle. Late bd (11msec) More CAMAC errors : MEDOFL's Missing most of the bus rogs Null looks bad. Big radial field.
May 19 1997 10:50:36:040AM	970519005	Steve Wolfe	shot 5: dud camac problems on engineering hiway again.
May 19 1997 11:04:09:780AM	970519006	Steve Wolfe	shot 6: Br tweak (it was very positive on the flux plot) fizzle. Null looks better, still not very good. Looks like a big EF4 imbalance.
May 19 1997 11:13:12:870AM	970519007	Steve Wolfe	shot 7: plasma 300msec at 600kA, just diverts. Note that there was an Ar puff at .3sec, but it was already in trouble.
May 19 1997 11:16:11:510AM	970519008	Steve Wolfe	shot 8: fizzle Ok, now try ECDC for 15 minutes.
May 19 1997 11:57:05:710AM	970519009	Steve Wolfe	shot 9: ECDC for about 30 min. after last fizzle. dud. Null looks horrid. EF4 imbalance now around 10Amps
May 19 1997 12:07:00:590PM	970519010	Steve Wolfe	shot 10: another dud. Still + radial field.
May 19 1997 12:13:56:080PM	970519011	Steve Wolfe	shot 11: dud Null still looks bad.
May 19 1997 12:20:39:430PM	970519012	Steve Wolfe	shot 12: Increase pre-puff. dud
May 19 1997 12:32:44:510PM	970519013	Steve Wolfe	shot 13: I recommended decreasing Br by 1mT (more negative). another dud. Null still looks screwed up around the bottom.
May 19 1997 12:43:29:940PM	970519014	Steve Wolfe	shot 14: Raised the fill fizzle. Nice early bd (5.7msec) Still not a good null. Bz is negative early and the gradient is large.
May 19 1997 01:17:42:590PM	970519018	Steve Wolfe	shot 18: plasma to .5 sec Density gets to 2.2e20/m2 (NL4) Null looks horrible. There seems to be a problem, but I don't see any bad flux loops. According to RECON_VAC signal, Br is taking a big negative step around 5msec.
May 19 1997 01:47:49:940PM	970519021	Steve Wolfe	shot 21: dud. Looking for the imbalance in Br. It looks like EF2U is about 100A more negative than EF2L, although both PHYS_A_OUT signals are close to zero, at -.1 sec. Therefter the Br gain may be pushing toward further imbalance?
May 19 1997 01:53:40:090PM	970519022	Steve Wolfe	shot 22: 1 sec long plasma. Dies on vertical instability.
May 19 1997 02:02:13:810PM	970519023	Steve Wolfe	shot 23: 1.07 sec long plasma. Dies on vertical instability. Earl thought he had loaded a shot with seg4 on and seg 2 off, but it looks like he got what seems to be the same program, instead of an 800kA "fiducial".
May 19 1997 04:00:35:250PM	970519035	Steve Wolfe	Shot 35: NO HYBRID supplies. Looks like the wavegen didn't pulse.
May 19 1997 04:25:25:770PM	970519036	Steve Wolfe	Shot 36: No power test. See if it works in a full cycle. Seems to have worked this time.
May 19 1997 04:40:15:960PM	970519037	Steve Wolfe	SHot 37: try for plasma again. See if Hybrid fails again. Hybrid ran ok. Got a fizzle.
May 19 1997 04:56:46:120PM	970519040	Steve Wolfe	shot 40: plasma, to a bit after 600msec, looks dirty and resistive again.

Physics Operator Comments
May 19 1997 08:51:30:440AM		Earl Marmar	Continuation of MP 170A, restart operations. Coldstart hybrid, no errors. The day started with the heaters turned off (probably for more than a day. Vessel temps below -100. RGA shows 4, 28, 14, almost nothing else. System restarted at about 8:40 am.
May 19 1997 09:56:44:670AM	970519001	Earl Marmar	"Tuesday" OH test CAMAC errors
May 19 1997 09:57:44:080AM	970519002	Earl Marmar	repeat "Tuesday" OH test looks ok
May 19 1997 10:19:50:970AM	970519003	Earl Marmar	plasma attempt base pressure = 1.5e-6! load from 970516002 move pre-fill puff earlier (open at -3.300 sec) lower initial gas puff nl_04 prog to 8e19 early in shot fizzle
May 19 1997 10:32:38:690AM	970519004	Earl Marmar	base pressure = 1.9e-6 try again; no changes fizzle big fluorocarbon puff
May 19 1997 06:03:26:960PM	970519005	Earl Marmar	dud
May 19 1997 11:00:40:670AM	970519006	Earl Marmar	base pressure = 1.7e-6 reduce prefill puff from 20 msec to 16 msec B_r offset to .006 from .0065 T fizzle
May 19 1997 11:11:23:170AM	970519007	Earl Marmar	base pressure = 1.6e-6 reduce prefill puff to 14 msec from 16 msec plasma disrupt at .3 s, just after it goes diverted
May 19 1997 05:46:31:640PM	970519008	Earl Marmar	fizzle
May 19 1997 11:53:00:700AM	970519009	Earl Marmar	between shots 8 and 9, ECDC'd in D2 P_fill = 5e-4 for 15 minutes P_fill = 2e-4 for 5 minutes mostly masses 20 and 18 came up on the RGA for shot 9: no changes base pressure = 1.2e-6 dud
May 19 1997 12:05:41:040PM	970519010	Earl Marmar	base pressure = 9.8e-7 change B_r offset back to .0065 from .006 T dud
May 19 1997 12:08:05:750PM	970519011	Earl Marmar	base pressure = 8.3e-7 add 1 msec to prefill puff (now 15 msec) dud
May 19 1997 05:47:35:940PM	970519012	Earl Marmar	dud
May 19 1997 12:26:06:120PM	970519013	Earl Marmar	base pressure = 7.1e-7 reduce B_r offset to .0055 T from ,0065 reduce pre-fill puff to 14 msec dud
May 19 1997 12:38:36:410PM	970519014	Earl Marmar	base pressure = 6.6e-7 increase pre-fill puff to 20 msec fizzle
May 19 1997 12:45:49:690PM	970519015	Earl Marmar	base pressure = 6.6e-7 decrease pre-fill puff to 18 msec dud
May 19 1997 12:56:10:590PM	970519016	Earl Marmar	increase prefill puff to 22 msec dud
May 19 1997 12:59:47:160PM	970519017	Earl Marmar	B_r offset to .007 base pressure = 5.9e-7 fizzle
May 19 1997 01:09:23:000PM	970519018	Earl Marmar	prefill pulse to 14 msec base pressure = 5.9e-7 plasma, 0.5 seconds
May 19 1997 01:19:30:180PM	970519019	Earl Marmar	no changes base pressure = 9.3e-7 fizzle
May 19 1997 01:26:23:280PM	970519020	Earl Marmar	B_r offset to .0075 T from .007 base pressure = 8.1e-7 dud
May 19 1997 01:36:13:110PM	970519021	Earl Marmar	B_r offset to .0068 T from .0075 dud
May 19 1997 01:46:41:170PM	970519022	Earl Marmar	prefill puff to 16 msec from 14 plasma; lasted to 1 second
May 19 1997 02:00:49:540PM	970519023	Earl Marmar	switch segment 2 to a 0.8MA fiducial-like program (PCS segment 04) base pressure = 8.7e-7 plasma, 1.05s but only 600 kA (forgot to load?)
May 19 1997 02:08:08:680PM	970519024	Earl Marmar	switch segment 2 to a 0.8MA fiducial-like program (PCS segment 04) dud
May 19 1997 02:15:54:740PM	970519025	Earl Marmar	B_r offset to .0065 from .0068 (just to feel like I did something). base pressure = 1.0 e-6 fizzle
May 19 1997 02:24:56:550PM	970519026	Earl Marmar	no changes base pressure = 8.7e-7 dud
May 19 1997 05:48:16:530PM	970519027	Earl Marmar	dud
May 19 1997 02:39:13:440PM	970519028	Earl Marmar	B_r offset to .0067 from .007 prefill puff to 17 msec from 16 msec base pressure = 6.6e-7 dud
May 19 1997 02:50:43:460PM	970519029	Earl Marmar	B_r offset .0062 base pressure = 6.2e-7 plasma; .2 seconds; .72 MA
May 19 1997 03:00:34:780PM	970519030	Earl Marmar	go back to previous segment 2; import current trace from 960828005, the 0,8MA shot from which this programming was originally derived base pressure = 9.5e-7 fizzle
May 19 1997 03:07:04:700PM	970519031	Earl Marmar	no changes base pressure = 7.2e-7 dud
May 19 1997 03:21:07:440PM	970519032	Earl Marmar	B_r offset to .0065 base pressure = 6.3 e-7 plasma; 1.2 seconds; .8MA, going vertically unstable; lose it at inversion lost PF breaker
May 19 1997 03:25:50:010PM	970519033	Earl Marmar	change clearin to -0.01 in segment 2 base pressure = 1.0e-6 dud
May 19 1997 03:41:11:600PM	970519034	Earl Marmar	lengthen Ar pulse program by 2 msec (P_G_1) fizzle
May 19 1997 03:48:24:440PM	970519035	Earl Marmar	base pressure = 7.9e-7 various power supply problems; many missing fields dud
May 19 1997 04:10:49:510PM	970519036	Earl Marmar	test to check out hybrid signals; no power supplies
May 19 1997 04:30:01:580PM	970519037	Earl Marmar	no changes; try again base pressure = 1.0e-6; 28 is going up and down fizzle
May 19 1997 04:36:42:120PM	970519038	Earl Marmar	no changes; try again base pressure = 6.3e-7 dud
May 19 1997 04:42:44:670PM	970519039	Earl Marmar	no changes base pressure = 6.8e-7 dud
May 19 1997 04:57:06:010PM	970519040	Earl Marmar	no changes base pressure = 6.0e-7 plasma; .625 s; something happened at .593 (n_e, T_e drop)
May 19 1997 04:57:20:940PM	970519041	Earl Marmar	no changes dud
May 19 1997 05:02:17:070PM	970519042	Earl Marmar	reduce prefill puff by 1 msec to 16 msec base pressure = 1.1e-6 dud

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:42:02:980AM	Test	Ok
2	09:54:24:620AM	Test	Ok
3	10:18:13:530AM	Plasma	Ok
4	10:29:23:650AM	Plasma	Ok
5	10:41:38:140AM	Plasma	Ok
6	10:54:29:680AM	Plasma	Ok
7	11:04:04:070AM	Plasma	Ok
8	11:13:46:550AM	Plasma	Ok
9	11:51:08:420AM	Plasma	Ok
10	11:58:11:200AM	Plasma	Ok
11	12:06:27:680PM	Plasma	Ok
12	12:14:52:930PM	Plasma	Ok
13	12:24:13:840PM	Plasma	Ok
14	12:34:13:710PM	Plasma	Ok
15	12:44:09:200PM	Plasma	Ok
16	12:51:45:210PM	Plasma	Ok
17	12:58:09:530PM	Plasma	Ok
18	01:05:42:060PM	Plasma	Ok
19	01:16:58:840PM	Plasma	Ok
20	01:24:46:660PM	Plasma	Ok
21	01:31:03:730PM	Plasma	Ok
22	01:41:02:980PM	Plasma	Ok
23	01:54:10:530PM	Plasma	Ok
24	02:05:53:490PM	Plasma	Ok
25	02:14:25:490PM	Plasma	Ok
26	02:21:43:710PM	Plasma	Ok
27	02:29:59:380PM	Plasma	Ok
28	02:37:43:360PM	Plasma	Ok
29	02:44:50:680PM	Plasma	Ok
30	02:54:48:910PM	Plasma	Ok
31	03:03:35:320PM	Plasma	Ok
32	03:10:16:850PM	Plasma	Ok
33	03:24:11:810PM	Plasma	Ok
34	03:38:11:210PM	Plasma	Ok
35	03:44:58:280PM	Plasma	Bad	many supplies didn't fire
36	04:09:14:040PM	Test	Ok
37	04:27:06:610PM	Plasma	Ok
38	04:33:22:320PM	Plasma	Ok
39	04:39:29:760PM	Plasma	Ok
40	04:46:42:210PM	Plasma	Ok
41	04:54:25:200PM	Plasma	Ok
42	05:00:42:090PM	Plasma	Ok