Miniproposals

Miniproposal: 417 Date Filed: 2/24/2005 Title: Plasma performance, boronization and ICRF heating effectiveness with high-Z antenna guards and all-m First Author: Yijun Lin Session Leader: Yijun Lin (shots 1-55)

Engineering Operator Run Comment

MP 417 EO Pierson PO Granetz SL Lin

Session Leader Plans

Entered: May 4 2005 09:05:46:817AM

Author: Yijun Lin

SL_PLAN: 1050504 (try the oribinal plan of 1050503) MP 417. Post-boronization evaluation We were not able to get a single plasma on 1050503. Run load shot 1050426022 (possibly at a slightly different density) Background: Boronization done only to the outer limiter and antennas. ECDC in D2 prior to the first plasma. We need to evaluate whether such boronization is effective, and whether it is as effective as the previous two boronizations, 1050419 (outer divertor only) and 1050425 (outer divertor together with outer limiter and antennas) Goal 1. Evaluate boronization by running constant discharges. 2. Evaluate the trend of impurities levels in the plasma Plan: 1. Load shot 1050426022 (including D2 puff in H-mode). Slightly modified RF waveform. 3 MW from 0.7 to 0.95 sec, 4 MW from 0.95 sec to 1.15 sec, and 5 MW from 1.15 to 1.5 sec. Do a density scan in the first 3 shots, target density at nl = 1.1, 0.9, 1.3e20 m^-2. For the subsequent shots, choose the density that give the best long EDA H-mode Assess the boronization effectiveness using the first 15 plasmas. 2. Decision point. A. If the performance is excellent (Wtot >= 170 kJ at 3 MW RF), we will continue running the same 1 MA plasmas until we see definite degradation of performance. (criterion: Wtot <~ 150 kJ at 1 MA and 3 MW Prf.) the run will stop as soon as there are three consecutive plasmas meeting the degradated performance criterion. In this case, we possibly run until 9 pm. No boronization will be followed. B. If the boronization has worn out substantially after 15 plasmas (150 kJ < Wtot < 165 kJ at 3 MW, 1 MA), we will continue 1 MA shot until we see three plasmas with Wtot <~ 150 kJ at 3 MW and 1 MA. If time allows (earlier than 5 pm), we will try boron shaker to inject boron to the outer limiter. We will also try Li-pellet injection. And see whether there is an improvement on the performance. In this case, the run will probably stop at 5 pm. No boronization will be followed. C. If the boronization is shown to be a "bust" (3 consecutive plasmas at Wtot < 150 kJ at 1 MA, 3 MW Prf), we will try the boron shaker and Li-pellet injections. We may also do N2 puff into RF heated L-mode and identify the dominant Mo sources. In this case, the run will definitely stop at 5 pm. Following this run, we will boronize the machine in a "normal" (to be defined) way.

Physics Operators Plans

Entered: May 3 2005 05:41:39:103PM

Author: Robert Granetz

Engineering setup for Wednesday, 04 May 2005 MP 417: Performance comparisons (post post 3nd boronization) Session leader: Y. Lin/B. Lipschultz Physics operator: R. Granetz Overnight ECDC in helium, using the "Marmar" dwell on the outboard side. Bake at 60 C. Run begins at 09:00 and may be extend beyond 17:00 (maybe even to 21:00). Power systems as on 1050503028 (1 MA, 5.4 T fiducial plasma) 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 with whatever Hybrid disabled fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill NINJA with 8 psi N2 Leave disabled to begin with Torvac setup: machine gate valves to remain open during and after shot. (I need to reconfirm this in the morning before the run begins.) Enable the following gate valves, assuming no vacuum problems: ECE, VUV, Z-bolo shutters Necessary diagnostics: Core/confinement incl. bolometry, pedestal profiles, H/D, boron and molybdenum monitoring ------------------------------------------------------------------------------- ICRF Setup: All transmitters in run on at 08:00. ------------------------------------------------------------------------------- Run plan: try to carry out Tuesday's original plan, i.e. repeat the same shot over and over again until noticeable degradation in performance is seen.

Session Leader Summaries

Entered: May 4 2005 09:14:09:167PM

Author: Yijun Lin

SL summary: A 12-hour run (total 55 shots). We had some progress in getting longer plasmas (e.g, shot 48, 51, and 53) comparing to run 1050503. The trouble in producing plasmas is due to the dust that is always seen in the LH camera view. At most times, we saw dust from the LH launcher, and also from somewhere on the inner wall. VUV view showed a lot of Ti. Analysis of samples of the debris found on the TCI window also showed significant amount of Ti. The dust is likely from the TiD2 (titanium hydride) somehow produced on the LH launcher. The theory is that TiD2 was produced during the backfill of 500 Torr of D2 at 60C during the weekend for TS calibration. During the calibration, lots of dust was observed (same as previous two TS calibrations done in this campaign). Similar plasma behavior was observed after the previous two D2 backfillings. However, it was not as bad as this time. Tests are being done on Ti materials in a D2 environment to see whether powder-like TiD2 can be easily formed. Methods to remove TiD2, for instance, backfilling He4 and pumping out, are being considered.

Physics Operator Summaries

Entered: May 5 2005 12:14:05:653PM

Author: Jim Irby

I took over from Bob Granetz on shot 42. Shot 41 was our longest discharge, 300 ms, and we hoped we could improve on that during the rest of the run. Unfortunately we only got a couple of discharges that approached shot 41 in discharge length. All shots were eventually limited by injections (most from the launcher, but not always). The LH video camera showed lots of activity on the grill, mostly the middle two couplers, near the bottom of the waveguides. There was some indication of hot spots taking 2 to 4 video frames to go away. These hot spots were again located near the bottom of the middle guides.

Session Leader Comments
May 4 2005 09:06:16:880AM	1050504001	Yijun Lin	fizzle
May 4 2005 09:24:45:357AM	1050504002	Yijun Lin	shorty. 450 kA, last until 150 ms. Dusts seen in LH launcher camera view. Record amount of gas coming off the wall after the disruption.
May 4 2005 09:45:27:130AM	1050504003	Yijun Lin	shorty. 130 ms. 400 kA.
May 4 2005 09:45:08:300AM	1050504004	Yijun Lin	dud
May 4 2005 10:02:56:183AM	1050504005	Yijun Lin	shorty. 400 kA, last until 150 ms.
May 4 2005 10:10:22:307AM	1050504006	Yijun Lin	shorty. 400 kA, last until 140 ms.
May 4 2005 10:31:25:877AM	1050504007	Yijun Lin	same shorty
May 4 2005 10:35:37:533AM	1050504008	Yijun Lin	600 kA. 200 ms.
May 4 2005 10:46:04:013AM	1050504009	Yijun Lin	dud
May 4 2005 11:04:04:270AM	1050504010	Yijun Lin	fizzle
May 4 2005 11:16:01:533AM	1050504011	Yijun Lin	to 200 kA, 90 ms
May 4 2005 11:30:12:603AM	1050504012	Yijun Lin	fizzle
May 4 2005 11:49:51:207AM	1050504013	Yijun Lin	600 kA, 200 ms
May 4 2005 11:56:11:627AM	1050504014	Yijun Lin	shot 14: fizzle Next: ICRF heating at the plasma startup. And see whether the plasma can survive longer.
May 4 2005 12:07:16:623PM	1050504015	Yijun Lin	fizzle
May 4 2005 12:26:35:817PM	1050504016	Yijun Lin	fizzle
May 4 2005 12:35:43:597PM	1050504017	Yijun Lin	340 kA, 130 ms Some ICRF power in from 0.08 to 0.12 sec.
May 4 2005 12:46:31:590PM	1050504018	Yijun Lin	to 260 kA, 130 ms Some RF power in.
May 4 2005 01:01:44:727PM	1050504019	Yijun Lin	fizzle
May 4 2005 01:11:27:973PM	1050504020	Yijun Lin	420 kA, 150 ms.
May 4 2005 01:23:15:687PM	1050504021	Yijun Lin	fizzle
May 4 2005 01:40:10:883PM	1050504022	Yijun Lin	dud
May 4 2005 01:59:56:017PM	1050504023	Yijun Lin	170 ms, 400 kA. We would like to get LH conditioning into vacuum betweein shots, and see whether the dust can be blown off and pumped out. (Apparently, there are not enough LH manpower available for this)
May 4 2005 02:19:48:727PM	1050504024	Yijun Lin	170 ms, 450 kA. Cell access for LH to move LH grill closer to the plasma. (At least try something)
May 4 2005 02:38:42:900PM	1050504025	Yijun Lin	fizzle (to 60 ms)
May 4 2005 02:53:20:180PM	1050504026	Yijun Lin	130 ms, 370 kA
May 4 2005 03:03:41:527PM	1050504027	Yijun Lin	fizzle
May 4 2005 03:16:36:587PM	1050504028	Yijun Lin	fizzle
May 4 2005 03:34:10:650PM	1050504029	Yijun Lin	135 ms, 420 kA Next: set current request to 400 kA.
May 4 2005 03:52:26:977PM	1050504030	Yijun Lin	125 ms, 300 kA Stuff from the inner wall, instead of the LH grill. It is different. Progress?
May 4 2005 04:12:44:760PM	1050504032	Yijun Lin	75 ms, 180 kA. Stuff from inner wall across the LH grill Next shot: full length plasma
May 4 2005 04:21:18:820PM	1050504033	Yijun Lin	110 ms, 400 kA. several bright spots on the LH grill. Next: get a better and longer plasma.
May 4 2005 04:34:31:197PM	1050504034	Yijun Lin	to 84 ms. Stuff from the innner wall.
May 4 2005 04:49:52:243PM	1050504035	Yijun Lin	to 145 ms. 300 kA. Stuff from both the innner wall and the grill. Next: No more ICRF. It does not seem to help at all.
May 4 2005 04:57:41:773PM	1050504036	Yijun Lin	fizzle
May 4 2005 05:17:15:993PM	1050504037	Yijun Lin	fizzle
May 4 2005 05:22:47:167PM	1050504038	Yijun Lin	fizzle
May 4 2005 05:41:14:447PM	1050504039	Yijun Lin	fizzle
May 4 2005 06:03:01:320PM	1050504040	Yijun Lin	plasma to 0.23 sec. started dying after 0.1 sec. current to 520 A. Still seeing stuff from the grill and inner wall
May 4 2005 06:06:52:400PM	1050504041	Yijun Lin	plasma to 0.3 sec. 500 kA. The best one in this week At least we have an almost normal plasma.
May 4 2005 06:19:35:260PM	1050504042	Yijun Lin	100 ms, 250 kA.
May 4 2005 06:35:44:417PM	1050504043	Yijun Lin	Plasma to 0.21 sec. 510 A. Killed by an injection.
May 4 2005 06:45:23:273PM	1050504044	Yijun Lin	dud
May 4 2005 07:03:00:213PM	1050504045	Yijun Lin	fizzle
May 4 2005 07:11:16:337PM	1050504046	Yijun Lin	90 ms. 200 kA. Still lots of stuff from the inner wall.
May 4 2005 07:21:58:807PM	1050504047	Yijun Lin	dud
May 4 2005 07:42:05:807PM	1050504048	Yijun Lin	260 ms, 550 kA. killed by an injection, apparently from the grill.
May 4 2005 07:49:05:947PM	1050504049	Yijun Lin	75 ms, 180 kA. Lots of brght spots from inner wall in LH camera view.
May 4 2005 08:03:54:680PM	1050504050	Yijun Lin	100 ms, 250 kA
May 4 2005 08:43:22:790PM	1050504051	Yijun Lin	230 ms, 520 kA. An injection killed the plasma.
May 4 2005 08:43:15:383PM	1050504052	Yijun Lin	72 ms, 110 kA.
May 4 2005 08:42:56:777PM	1050504053	Yijun Lin	260 ms, 500 kA. No Camera data.
May 4 2005 08:53:18:947PM	1050504054	Yijun Lin	fizzle
May 4 2005 09:11:45:870PM	1050504055	Yijun Lin	120 ms, 300 kA

Physics Operator Comments
May 4 2005 09:06:42:207AM	1050504001	Robert Granetz	Fizzle. Looks like the current turned over for radiative reasons. Fields look okay. Prior to this shot I had reduced the pre-fill from 18 to 15 ms. Next shot: reduce pre-fill puff another 2 ms.
May 4 2005 09:23:39:887AM	1050504002	Robert Granetz	Plasma, but short. Made it to 450 kA at t=0.15 s. Lots of radiated power towards the end. Bruce reports lots of D2 came off of the wall on this shot. Next shot: reduce pre-fill another 2 ms.
May 4 2005 09:34:42:273AM	1050504003	Robert Granetz	Plasma. Another short dirty disruption. More D2 pumped out. Next shot: no changes.
May 4 2005 09:43:48:660AM	1050504004	Robert Granetz	Dud. Fields okay. Next shot: increase pre-fill by 2 ms (back to 13 ms).
May 4 2005 10:03:11:577AM	1050504005	Robert Granetz	Plasma. Another short dirty one. The outgassing tripped the gate valves. All of these plasma have had lots of dust showing up in the LH camera view. I don't think we're making much progress, but Bruce reports that we only got out 30 mtorr of D2 after this shot, compared to 120 mtorr after the first shot. So the gas load is decreasing, but the dust isn't, and the discharge performance isn't improving either. Next shot: no changes.
May 4 2005 10:16:45:243AM	1050504006	Robert Granetz	Plasma. Same-o, same-o. I think the dust from the LH area is killing us. Next shot: no changes.
May 4 2005 10:30:50:283AM	1050504007	Robert Granetz	Plasma. Same thing. Next shot: no changes
May 4 2005 10:43:47:920AM	1050504008	Robert Granetz	Plasma. Better. 0.6 MA, 0.21 s. Next shot: keep going, no changes
May 4 2005 10:46:39:323AM	1050504009	Robert Granetz	Dud. Next shot: add 2 ms to pre-fill.
May 4 2005 11:08:45:207AM	1050504010	Robert Granetz	Fizzle. Next shot: take 1 ms off of the pre-fill.
May 4 2005 11:25:23:840AM	1050504011	Robert Granetz	Plasma. Very short. Bruce's spectroscopy shows lots of Ti, and no Mo. Next shot: why bother?
May 4 2005 11:34:03:320AM	1050504012	Robert Granetz	Fizzle.
May 4 2005 11:46:19:083AM	1050504013	Robert Granetz	Plasma. 0.57 MA, 0.2 s. A big spray of dust comes out from the LH launcher early on. Next shot: full-length discharge
May 4 2005 12:02:02:327PM	1050504014	Robert Granetz	Fizzle. Next shot: set Ip to 0.6 MA (reached at 0.20 s), pull RCUR in a bit, and take 1 ms off the pre-fill.
May 4 2005 12:09:59:667PM	1050504015	Robert Granetz	Fizzle. Next shot: No changes. 0.6 MA. RF is trying to fire very early.
May 4 2005 12:23:36:070PM	1050504016	Robert Granetz	Fizzle. Next shot: take another 1 ms off the pre-fill.
May 4 2005 12:36:10:110PM	1050504017	Robert Granetz	Plasma. Short, 350 kA, 0.12 s. Next shot: set Ip to 300 kA.
May 4 2005 12:51:45:137PM	1050504018	Robert Granetz	Plasma. Short. DIdn't quite make it to 300 kA. Next shot: no changes.
May 4 2005 01:00:35:053PM	1050504019	Robert Granetz	Fizzle. Next shot: set Ip to 0.6 MA.
May 4 2005 01:15:06:143PM	1050504020	Robert Granetz	Plasma. Another short one. 400 kA max. Next shot: no changes.
May 4 2005 01:28:12:327PM	1050504021	Robert Granetz	Plasma. Really, really short. Dust apparently comes in from a high, inboard region on the LH camera view. Next shot: no changes
May 4 2005 01:41:11:947PM	1050504022	Robert Granetz	Dud. Next shot: add 2 ms to pre-fill.
May 4 2005 01:58:50:280PM	1050504023	Robert Granetz	Plasma. Short, 400 kA. Next shot: no changes.
May 4 2005 02:25:29:803PM	1050504024	Robert Granetz	Plasma. Short, 0.45 MA. Cell access granted in order to move the LH launcher inward to 3 mm from the limiter surface. Next shot: no PCS changes. See if the LH dust behavior changes.
May 4 2005 02:47:32:470PM	1050504025	Robert Granetz	Plasma. Very short. There was some action at the LH grill, but only one frame of video, which wasn't very clear. Next shot: no changes
May 4 2005 02:57:09:553PM	1050504026	Robert Granetz	Plasma. Short. Very bright spot on the LH grill...might indicate a localized source of dust, due to the proximity to the plasma edge. Next shot: no changes
May 4 2005 03:09:26:243PM	1050504027	Robert Granetz	Fizzle. Next shot: no changes.
May 4 2005 03:22:20:930PM	1050504028	Robert Granetz	Fizzle. Two in a row. Next shot: add 2 ms to pre-fill (Steve Wolfe's suggestion)
May 4 2005 03:34:25:620PM	1050504029	Robert Granetz	Plasma. Short pulse. 0.4 MA. Lots of bright stuff from the LH grill. Next shot: set Ip at 400 kA.
May 4 2005 03:52:09:883PM	1050504030	Robert Granetz	Plasma. Short. More bright stuff on the cameras, but not necessarily from the LH grill. Next shot: repeat.
May 4 2005 04:04:45:383PM	1050504031	Robert Granetz	Plasma. Short. Next shot: full length plasma.
May 4 2005 04:14:28:633PM	1050504032	Robert Granetz	Plasma. Very short shot. Next shot: repeat
May 4 2005 04:26:54:870PM	1050504033	Robert Granetz	Plasma. Short. Bright spots on LH grill. Next shot; repeat.
May 4 2005 04:44:45:383PM	1050504034	Robert Granetz	Plasma. Short. Next shot; repeat.
May 4 2005 04:46:03:290PM	1050504035	Robert Granetz	Plasma. Short. Next shot; repeat.
May 4 2005 05:01:21:570PM	1050504036	Robert Granetz	Fizzle. Next shot: no changes.
May 4 2005 05:16:44:697PM	1050504037	Robert Granetz	Fizzle. Two in a row. Time to do something. Next shot: Add 2 ms to pre-fill pulse.
May 4 2005 05:28:09:633PM	1050504038	Robert Granetz	Fizzle. Three in a row. Time to do something more. Next shot: Add 3 ms to pre-fill pulse.
May 4 2005 05:40:26:167PM	1050504039	Robert Granetz	Fizzle. Four in a row. Time to do something very different. Next shot: Subtract 10 ms to pre-fill pulse.
May 4 2005 05:55:04:273PM	1050504040	Robert Granetz	Plasma. Short. Next shot: repeat, no changes
May 4 2005 10:19:57:587PM	1050504040	Robert Granetz	Jim Irby will take over as physics operator for shot 42 and later. (I've loaded shot 41 and hit the button.)
May 4 2005 06:17:00:087PM	1050504041	Jim Irby	repeat Bob did it --- 301 ms still early rise in VB --- density ramp starts at 240 ms injections still seen from grill, particularly middle couplers
May 4 2005 06:28:22:370PM	1050504042	Jim Irby	no changes plasma for 99 ms injections early
May 4 2005 06:36:07:977PM	1050504043	Jim Irby	ip request to 600 kA plasma for 207 ms not a lot of material from the launcher try again...
May 4 2005 06:51:20:463PM	1050504044	Jim Irby	density request from 1.0 to 0.9 e 20 /m^2 dud --- let gas get too low?
May 4 2005 07:01:22:870PM	1050504045	Jim Irby	added 3 ms to gas (from 12 to 15 ms) fizzle injections nothing seen at launcher, but "dust" above and inside launcher on frame 2
May 4 2005 07:19:34:243PM	1050504046	Jim Irby	no changes plasma for 86 ms injections did us in again lh view shows dust in frame 3, but possibly not directly from launcher current rise a little slower than on 41 gas actually beginning to pump out before injections began
May 4 2005 07:23:25:510PM	1050504047	Jim Irby	no changes dud no gas!
May 4 2005 07:43:03:103PM	1050504048	Jim Irby	no changes plasma for 267 ms 550 kA injection from launcher probably did that one in density rise starts up at 200 ms along with VB
May 4 2005 07:53:45:587PM	1050504049	Jim Irby	no changes plasma for 75 ms very large injection event seen on LH view afterglow in h-alpha following current drop
May 4 2005 08:13:50:370PM	1050504050	Jim Irby	repeat plasma for 98 ms no clear indication of dust injection on any of the cameras mass 18, 20, and 28 at all time lows for this campaign basepressure 8.5e-7 Torr before shot
May 4 2005 08:18:19:510PM	1050504051	Jim Irby	no changes plasma for 225 ms plenty of dust seen on j-ant view
May 4 2005 08:33:54:760PM	1050504052	Jim Irby	repeat 72 ms of plasma
May 4 2005 08:47:03:290PM	1050504053	Jim Irby	increased gas puff from 20 to 50 ms to help kill x-rays 260 ms lost all our camera data
May 4 2005 09:08:57:620PM	1050504054	Jim Irby	repeat injection kills us at 25 ms data system problem with pcdaqlh1
May 4 2005 09:22:16:070PM	1050504055	Jim Irby	last shot --- repeat 120 ms of plasma cameras screwed up note that wide2 consistently sees a bright spot on the launcher, probably during the 10 or 15 ms period the z-meter sees extra light.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	09:00:24:163AM	Plasma	Ok
2	09:15:39:080AM	Plasma	Ok
3	09:28:18:463AM	Plasma	Ok
4	09:40:57:193AM	Plasma	Ok
5	09:53:38:377AM	Plasma	Ok
6	10:06:15:433AM	Plasma	Ok
7	10:18:57:977AM	Plasma	Ok
8	10:31:43:160AM	Plasma	Ok
9	10:44:21:450AM	Plasma	Ok
10	11:00:40:443AM	Plasma	Ok
11	11:13:27:907AM	Plasma	Ok
12	11:26:15:153AM	Plasma	Ok
13	11:38:59:540AM	Plasma	Ok
14	11:51:24:457AM	Plasma	Ok
15	12:03:56:920PM	Plasma	Ok
16	12:16:34:557PM	Plasma	Ok
17	12:29:30:240PM	Plasma	Ok
18	12:42:17:530PM	Plasma	Ok
19	12:55:09:417PM	Plasma	Ok
20	01:08:16:397PM	Plasma	Ok
21	01:21:02:453PM	Plasma	Ok
22	01:35:55:150PM	Plasma	Ok
23	01:48:54:503PM	Plasma	Ok
24	02:07:14:280PM	Plasma	Ok
25	02:36:10:977PM	Plasma	Ok
26	02:48:51:360PM	Plasma	Ok
27	03:01:39:370PM	Plasma	Ok
28	03:14:54:477PM	Plasma	Ok
29	03:27:31:120PM	Plasma	Ok
30	03:40:21:807PM	Plasma	Ok
31	03:53:08:557PM	Plasma	Ok
32	04:05:35:917PM	Plasma	Ok
33	04:18:02:167PM	Plasma	Ok
34	04:30:26:463PM	Plasma	Ok
35	04:43:16:070PM	Plasma	Ok
36	04:55:49:070PM	Plasma	Ok
37	05:08:22:353PM	Plasma	Ok
38	05:20:56:057PM	Plasma	Ok
39	05:38:26:260PM	Plasma	Ok
40	05:50:54:727PM	Plasma	Ok
41	06:03:29:820PM	Plasma	Ok
42	06:16:25:040PM	Plasma	Ok
43	06:29:04:040PM	Plasma	Ok
44	06:43:01:540PM	Plasma	Ok
45	06:55:28:400PM	Plasma	Ok
46	07:08:04:307PM	Plasma	Ok
47	07:20:20:760PM	Plasma	Ok
48	07:32:40:493PM	Plasma	Ok
49	07:45:24:540PM	Plasma	Ok
50	07:57:42:447PM	Plasma	Ok
51	08:10:08:883PM	Plasma	Ok
52	08:22:33:430PM	Plasma	Ok
53	08:38:41:570PM	Plasma	Ok
54	08:51:00:587PM	Plasma	Ok
55	09:09:33:120PM	Plasma	Ok