| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Yijun Lin |
| Physics operator(s): | Bill Rowan,Ian Hutchinson |
| Engineering operator(s): | Bill Cochran,Ed Fitzgerald,Bill Parkin |
| Engineering Operator Run Comment |
| Continuation of MP417? |
| Session Leader Plans |
| Entered: May 5 2005 12:15:15:357PM |
| Author: Yijun Lin |
| Continue on 1050504. Try to get plasmas.
If we get good plasmas, we will run MP417 to evaluate the boronization. We did He flow in 200 torr and 600 Torr in the morning in the machine (total about 4 hours). Thomson scattering saw fewer dust events comparing the beginning (0 events in 10 shots in compared with 3-4 events per shot). Hopefully, we will get significantly less dust in plasma attempts. |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: May 6 2005 09:33:18:597AM |
| Author: Yijun Lin |
| SL summary:
Getting longer plasmas than the previous two runs. shot 16 got to 0.9 sec and shot 22 got to 0.72 sec. Apparently, He4 flow in the morning did not help much. We are in the same slow progress as the last two runs. --------- On the TiD2 powder theory: Supportive evidence: 'Sand' piles are observed in the LH camera view on the grill. It is consistent with the speculation by D. Whyte that there might be 16 gram of TiD2 powder (from the estimation of total degasing in run 1050504). these sand piles may also be Boron hydride or boron after the boronization. Contradictory evidence: Dave Gwinn and Bob Childs performed a test on the Ti alloy we used on the couplers. A sample was put in our vacuum oven, baked at 90C to drive off the water, and then brought back down to 60 C. The chamber was then filled with 500 T of D2 and left 20 hours or so. The sample and a control sample left out of the oven look identical both by eye and under the microscope. No indication of dust or flaking. No change in weight of the oven sample. the test may not have reproduced the evironment on the vessel. Some other things must have helped. We can count them: boronization, ECDC in He4 and/or ECDC in D2. But we have no idea on how this actually could help. ----------- |
| Physics Operator Summaries |
| Entered: May 5 2005 05:08:43:793PM |
| Author: Ian Hutchinson |
| Two plasmas lasted over .5 seconds.
There was some progress but the dust and deuterium is still overwhelming. |
| Session Leader Comments | |||
| May 5 2005 12:27:59:873PM | 1050505001 | Yijun Lin | fizzle |
| May 5 2005 12:50:11:077PM | 1050505002 | Yijun Lin | 260 ms. 560 kA. (encourging) |
| May 5 2005 12:55:30:077PM | 1050505003 | Yijun Lin | fizzle. to 75 ms.
|
| May 5 2005 01:12:30:623PM | 1050505004 | Yijun Lin | plasma to 130 ms, i_max = 280 kA. Stuff coming from the LH launcher
and other places. Next shot: 1050505005, interesting number --> good plasma? |
| May 5 2005 01:27:28:077PM | 1050505005 | Yijun Lin | fizzle.
Apparently, an interesting shot number did not guarrantee a good plasma. The machine does not know the beauty of numbers. |
| May 5 2005 01:34:22:717PM | 1050505006 | Yijun Lin | fizzle |
| May 5 2005 01:51:14:327PM | 1050505007 | Yijun Lin | 340 ms. 600 kA. (the longest plasma this week/month. better than 1050504041)
Still stuff came off the LH grill. |
| May 5 2005 02:01:36:263PM | 1050505008 | Yijun Lin | 170 ms. 300 kA. |
| May 5 2005 02:32:58:077PM | 1050505009 | Yijun Lin | 300 ms. 570 kA. One of the best plasmas we have had since 1050503.
there were a few LH camera frames that did not show any dust. It looks like 'sand'piling on the LH grill from the camera view (frame 9). More 'sand' is on the lower part than the upper part. Is it just optical illusion? It was definitely not there last week. |
| May 5 2005 02:28:50:107PM | 1050505010 | Yijun Lin | 210 ms. 360 kA |
| May 5 2005 02:48:45:670PM | 1050505011 | Yijun Lin | 340 ms. 600 kA. Same sand piles seen in LH view (e.g. frame 9)
Next: try inner wall limited plasma to get plasma longer. |
| May 5 2005 02:51:36:717PM | 1050505012 | Yijun Lin | trying innner wall limited plasma. Fizzle
|
| May 5 2005 03:14:39:373PM | 1050505013 | Yijun Lin | 370 ms. 600 kA. (longest plasma today so far)
|
| May 5 2005 03:20:05:480PM | 1050505014 | Yijun Lin | to 70 ms. fizzle. |
| May 5 2005 03:44:27:920PM | 1050505015 | Yijun Lin | to 140 ms, 360 kA. |
| May 5 2005 03:55:55:043PM | 1050505016 | Yijun Lin | to 0.93 sec, 600 kA. inner wall limited. (good shot!)
No LH camera data. H/D~1% Note: This was the 100th shot this week/month. Maybe shot numbers do matter. |
| May 5 2005 04:04:55:107PM | 1050505017 | Yijun Lin | to 70 ms. fizzle |
| May 5 2005 04:11:45:560PM | 1050505018 | Yijun Lin | to 120 ms. |
| May 5 2005 04:36:33:140PM | 1050505019 | Yijun Lin | shot 19: plasma till 340 ms, 570 kA.
Camera data is back. It is hard to tell whether the 'sand' piles have been getting bigger or smaller. They are about the same size as yesterday. |
| May 5 2005 04:37:32:983PM | 1050505020 | Yijun Lin | plasma to 75 ms. |
| May 5 2005 04:55:56:983PM | 1050505021 | Yijun Lin | plasma to 220 ms. |
| May 5 2005 05:03:42:700PM | 1050505022 | Yijun Lin | plasma to 720 ms, 600 kA. good shot
|
| Physics Operator Comments | |||
| May 5 2005 11:32:21:390AM | Bill Rowan | Attempts during the morning to purge dust. Start from shot 1050504055 | |
| May 5 2005 11:36:08:500AM | Bill Rowan | Load into PCS Load at 5-May-2005 11:34:00.00 Open tree /home/rowan -1 Open tree done | |
| May 5 2005 12:27:32:373PM | 1050505001 | Bill Rowan | Fizzle |
| May 5 2005 12:33:56:107PM | 1050505001 | Bill Rowan | Next shot: No changes. See what it does |
| May 5 2005 12:44:34:250PM | 1050505002 | Bill Rowan | 0.26 s Next shot. No changes |
| May 5 2005 12:55:42:420PM | 1050505003 | Bill Rowan | 0.07 s Next shot. No changes |
| May 5 2005 12:59:15:780PM | 1050505003 | Bill Rowan | 0.07 s Next shot. No changes |
| May 5 2005 01:18:56:607PM | 1050505004 | Ian Hutchinson | Set Rcur offset in segment 1 to 500 from 2500.
No other changes for shot 4. Plasma till .14s No changes. |
| May 5 2005 01:35:12:153PM | 1050505005 | Ian Hutchinson | 40kA died at 30ms. Apparently vertical position problem.
Rcur offset to 1500 Br offset to 0 from -.0005 |
| May 5 2005 01:44:52:840PM | 1050505006 | Ian Hutchinson | 30kA fizzle.
No changes. |
| May 5 2005 02:04:28:060PM | 1050505007 | Ian Hutchinson | Plasma till .35s. Choking on radiation. Probably that would have been ok if the density demand had not been so high.
Lower nl04 to 5e19. |
| May 5 2005 02:13:39:513PM | 1050505008 | Ian Hutchinson | Plasma till .18s, 300kA.
Lower gas puff 3 in segment 1. Rcur offset to 2500 from 1500. |
| May 5 2005 02:25:34:293PM | 1050505009 | Ian Hutchinson | Plasma till .29s. 590kA.
No change |
| May 5 2005 02:39:49:090PM | 1050505010 | Ian Hutchinson | Plasma to .21s. |
| May 5 2005 02:48:50:793PM | 1050505011 | Ian Hutchinson | Plasma to .35s. 590kA.
Since the gas puff was off, this shot demonstrates that the excessive density rise is not due to puffed gas. |
| May 5 2005 03:00:29:560PM | 1050505012 | Ian Hutchinson | Attempt at limited plasma. Clearin and Rcur adjusted to be constant for most of the shot, instead of transitioning to diverted.
Plasma to .08s. |
| May 5 2005 03:14:15:340PM | 1050505013 | Ian Hutchinson | Plasma till .37s. Limited plasma going resistive. |
| May 5 2005 03:29:36:937PM | 1050505014 | Ian Hutchinson | Plasma to .075s. |
| May 5 2005 03:31:12:750PM | 1050505015 | Ian Hutchinson | Plasma to .14s. |
| May 5 2005 03:58:53:217PM | 1050505016 | Ian Hutchinson | Plasma to .94s. Density rises steadily despite no gas.
Adjust clearin to -.03 make more circular. Raise zcur to zero. |
| May 5 2005 04:11:20:090PM | 1050505017 | Ian Hutchinson | Plasma till .064s. Vertical position control lost because the current rise was so slow. |
| May 5 2005 04:17:58:280PM | 1050505018 | Ian Hutchinson | Plasma till .12s. Killed by titanium radiation. |
| May 5 2005 04:37:29:200PM | 1050505019 | Ian Hutchinson | Plasma till .34s. |
| May 5 2005 04:50:00:420PM | 1050505020 | Ian Hutchinson | Plasma till .075s. |
| May 5 2005 05:03:17:670PM | 1050505021 | Ian Hutchinson | Plasma till .23s. |
| May 5 2005 05:03:50:530PM | 1050505022 | Ian Hutchinson | Plasma till .7s. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 12:20:00:437PM | Plasma | Ok | |
| 2 | 12:37:08:200PM | Plasma | Ok | |
| 3 | 12:49:49:840PM | Plasma | Ok | |
| 4 | 01:04:44:950PM | Plasma | Ok | |
| 5 | 01:20:17:390PM | Plasma | Ok | |
| 6 | 01:32:48:467PM | Plasma | Ok | |
| 7 | 01:45:20:857PM | Plasma | Ok | |
| 8 | 01:58:33:967PM | Plasma | Ok | |
| 9 | 02:11:01:717PM | Plasma | Ok | |
| 10 | 02:23:42:763PM | Plasma | Ok | |
| 11 | 02:36:15:250PM | Plasma | Ok | |
| 12 | 02:49:46:467PM | Plasma | Ok | |
| 13 | 03:02:29:310PM | Plasma | Ok | |
| 14 | 03:15:17:077PM | Plasma | Ok | |
| 15 | 03:27:52:450PM | Plasma | Ok | |
| 16 | 03:40:35:827PM | Plasma | Ok | |
| 17 | 03:56:55:047PM | Plasma | Ok | |
| 18 | 04:09:32:763PM | Plasma | Ok | |
| 19 | 04:22:13:483PM | Plasma | Ok | |
| 20 | 04:35:08:997PM | Plasma | Ok | |
| 21 | 04:47:58:793PM | Plasma | Ok | |
| 22 | 05:00:47:077PM | Plasma | Ok | |