| Miniproposals |
| Operators | |
| Session leader(s): | |
| Physics operator(s): | Jim Irby |
| Engineering operator(s): | Andy Pfeiffer,Ed Fitzgerald,Sam Pierson |
| Engineering Operator Run Comment |
| 1) begin to debug OH supply ripple 2) produce a plasma PO Jim Irby |
| Session Leader Plans |
| Physics Operators Plans |
| Entered: Nov 27 2007 05:33:06:163PM |
| Author: Jim Irby |
| -----------------
Engineering Setup ----------------- Tasks to consider: 1) begin to debug OH supply ripple 2) produce a plasma Run begins at 09:00 and ends at 17:00 Power systems as on: 1071127024 Acoil: +Dtop -Dbot -Jtop +Jbot (standard) Hybrid 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 pumped out and DISABLED Enable gatevalves and shutters: ECE, VUV, DNB, Z-bolo Torvac gatevalve toggle (yes/no): no Boronization(yes/no): no Overnight ECDC (yes/no): yes Vessel temp: 60/60/60 ICRF(yes/no): no LH(yes/no): no DNB(yes/no): no Cryopump (yes/no): no ------------------------------ ECDC Parameters ------------------------------ gas and pressure: D2 at 2e-4 Torr sweep: 44/45/103 cm scan: 20/120 s |
| Session Leader Summaries |
| Physics Operator Summaries |
| Entered: Nov 29 2007 08:21:57:233AM |
| Author: Jim Irby |
| The first shot today was a fizzle, but on shot 02, after a gas adjustment, a 250 ms plasma was produced. Unfortunately, we did not get another plasma until shot 11. The rga indicated a continual shot-to-shot decrease in impurity levels until by shot 10 we were back down to pre-shot 02 levels, though that is unlikely to explain the plasma on shot 11. Before shot 05 we did 30 minutes of D2 ECDC while CAMAC and data system issues were worked out. The main effect of the ECDC was to to stir up more impurities, that then took still longer to clean out of the machine. The discharge on shot 11 lasted 350 ms, but evolved much less impurity gas than shot 02. This result seemed to have been a good thing, but we still did not get another plasma, even as the rga indicated a relatively clean background gas.
On shot 21 the DPCS failed, apparently because its server rebooted right before or during the shot cycle. Strange magnet currents were produced. This problem is being very actively investigated. No stress alarms were generated. On shot 22 the oh1 switch did not close, probably because of the problem on shot 21. I only made one small tweak to Bz0 and another to Br0 during the run. Most tweaks were to the gas. I doubt any of these changes would have mattered in a well conditioned machine. If we have similar bad luck with plasma production on Thursday, we should consider warming up the machine somewhat and continuing the 120C bake. plasmas: 02,11 problems: --------- data/camac problems 06,07 fuse replaced in oh1 supply --- SCRs okay, hipot okay duds 17,18 --- F25 issue --- zapping fixed problem shot 21: DPCS server reboot |
| Session Leader Comments |
| Physics Operator Comments | |||
| Nov 28 2007 08:08:51:950AM | Jim Irby | Power supply for H-Alpha rack that failed yesterday has been re-installed.
RGA levels of mass 28, 32, 18 considerably lower than yesterday morning. | |
| Nov 28 2007 09:06:24:143AM | 1071128001 | Jim Irby | H-alpha/CIII signals should be at proper amplitude today
Prepuff will be left at 28 ms as on 1071127024 I asked the rf guys not to condition this morning before the run after they brought up rga levels on their first pulse. Loaded 1071127024 w/o change just to verify PCS operation --- ok Comparison of VB signal from 1071127004 with signal from 1070831030 indicated very little difference during breakdown or well into the discharge. ---------------------------- fizzle h-alpha and ciii signals back in operation ciii signal probably about a factor of 5 larger than seen on clean boronized machine. |
| Nov 28 2007 09:30:39:280AM | 1071128002 | Jim Irby | prepuff from 28 to 26 ms
plasma for 288 ms h/(h+d) = 20% --- not bad lost it starting about 286 ms RGA levels still up a factor of 10 after 15 minutes peak gas puff about 21 Torr-l/s but no gas required past 110 ms or so |
| Nov 28 2007 09:57:52:977AM | 1071128003 | Jim Irby | waiting for cooling --- ln2 pump did not turn on after shot.
cooling ready but will start shot cycle at t=+25 minutes.... fizzle --- ln2 pump did turn back on after this shot --------------------------------- fizzle --- impurity levels still high before shot particularly masses 14 and 18. fields okay gas maybe a little high |
| Nov 28 2007 09:59:26:977AM | 1071128004 | Jim Irby | no DPCS changes
fizzle will ecdc before next shot |
| Nov 28 2007 11:02:12:093AM | 1071128005 | Jim Irby | ecdc for 30 minutes. Large levels of mass 28,32, 18, etc during ecdc compared to levels this morning just before we stopped it.
prepuff from 26 to 24 ms loaded tree starting shot cycle at t=+55 minutes ------------------------------------------- 7.9e-7 Torr at check fizzle --- breakdown earlier than on shot 2 fields okay |
| Nov 28 2007 11:22:03:993AM | 1071128006 | Jim Irby | DPCS repeat
5.1e-7 Torr in check ------------------------- fizzle fields and gas okay lost TCI data and probably other signals (h-alpha, ciii) |
| Nov 28 2007 11:39:09:547AM | 1071128007 | Jim Irby | no power shot --- check out data system
still lots of missing data --- TCI, TF tap data, halpha, ciii.... |
| Nov 28 2007 11:48:19:393AM | 1071128007 | Jim Irby | 11:48 going into cell to check h-alpha rack
ln2 pump off |
| Nov 28 2007 11:52:17:490AM | 1071128007 | Jim Irby | bad fan in CAMAC crate did in highway --- replacing... |
| Nov 28 2007 12:27:45:380PM | 1071128008 | Jim Irby | after replacing oh1 fuse, and fan in CAMAC crate we are ready to try again I hope. TCI test shot was okay indicating at least some of the data system is back.
No DPCS changes. ----------------------------- fizzle --- boring --- a little plasma current gas and fields still okay tf tap, halpha, tci, etc back in operation |
| Nov 28 2007 12:35:30:160PM | 1071128009 | Jim Irby | prepuff from 24 to 27 ms
---------------------------- fizzle |
| Nov 28 2007 12:58:09:327PM | 1071128010 | Jim Irby | ef4 from -1345 to -1355 A
note that most RGA lines are at or below levels seen before shot 2 today. increased cc cooling to 35% from 25% ---------------------------------------- fizzle Note that ecdc before shot 5 had no effect on the ciii light. However, the ciii light was similar to level seen on shot 1 by shot 8 when the data system was functioning again. fields (bz0, br0) now identical to shot 2, but gas higher and breakdown later. |
| Nov 28 2007 02:21:43:057PM | 1071128011 | Jim Irby | no DCPS changes
plasma for 350 ms but start losing it by 260 ms about a factor of two lower signal levels seen on RGA immediately following discharge compared to shot 02 (though discharge lasted 90 ms longer). fields good --- breakdown earlier |
| Nov 28 2007 01:21:10:100PM | 1071128012 | Jim Irby | no changes
fizzle |
| Nov 28 2007 01:33:01:637PM | 1071128013 | Jim Irby | no changes
fizzle |
| Nov 28 2007 01:59:10:277PM | 1071128014 | Jim Irby | prepuff from 27 to 25 ms
fizzle fields okay rga indicates levels factor of two above those before shot 11 ciii signal largest of day so far |
| Nov 28 2007 02:05:21:397PM | 1071128015 | Jim Irby | no DCPS changes
IGT at check 2.6e-7 Torr fizzle fields okay --- gas low? |
| Nov 28 2007 02:34:12:763PM | 1071128016 | Jim Irby | cc cooling back to 25 from 35%. Slow increase in mass 14 and 28 reversed by this change.
prefill from 25 to 29 ms Br0 from -0.0035 to -0.00375 waiting on IGOR.... IGT at check 2.1e-7 Torr ------------------------------------ fizzle --- breakdown later, ciii lower m14 and 28 still a factor of two high relative to pre shot 11. |
| Nov 28 2007 02:51:44:037PM | 1071128017 | Jim Irby | prepuff back to 24 ms from 29.
loaded tree fizzle --- big jump in fields --- f25 problem (not shorted though) |
| Nov 28 2007 03:05:49:150PM | 1071128018 | Jim Irby | will try again w/o cell entry to fix f25
prefill from 24 to 25 ms dud --- fields indicate intense magnetic storm on Jupiter --- Bob goes to cell |
| Nov 28 2007 03:36:45:820PM | 1071128019 | Jim Irby | f25 was zapped.
no DPCS changes --------------------------- fields okay again, but fizzle ciii large (.027) |
| Nov 28 2007 03:50:05:450PM | 1071128020 | Jim Irby | no changes
fizzle -- gas low relative to shot 02 and 15 |
| Nov 28 2007 04:00:38:733PM | 1071128021 | Jim Irby | prefill to 27 from 24 ms
DPCS or other serious error --- OH1 went in wrong direction, servers may have rebooted during shot cycle. |
| Nov 28 2007 04:55:57:617PM | 1071128022 | Jim Irby | DPCS issues resolved by Josh and Steve ---trying again for plasma
no DPCS changes (same as shot 21) dud --- oh1 switch did not close all to the power room... |
| Nov 28 2007 05:06:14:447PM | 1071128023 | Jim Irby | try again. Bill and Sam think the problem has been fixed. This shot will at least show we are ready for the run tomorrow.
fizzle --- no faults all done |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:56:49:687AM | Plasma | Ok | |
| 2 | 09:10:19:897AM | Plasma | Ok | |
| 3 | 09:37:56:483AM | Plasma | Ok | |
| 4 | 09:50:25:460AM | Plasma | Ok | |
| 5 | 10:48:13:620AM | Plasma | Ok | |
| 6 | 11:02:47:127AM | Plasma | Ok | |
| 7 | 11:19:54:680AM | Plasma | Bad | State Init failure |
| 8 | 12:15:43:107PM | Plasma | Ok | |
| 9 | 12:28:55:003PM | Plasma | Ok | |
| 10 | 12:43:58:587PM | Plasma | Ok | |
| 11 | 12:56:48:403PM | Plasma | Ok | |
| 12 | 01:11:39:973PM | Plasma | Ok | |
| 13 | 01:27:40:790PM | Plasma | Ok | |
| 14 | 01:43:53:297PM | Plasma | Ok | |
| 15 | 02:02:04:010PM | Plasma | Ok | |
| 16 | 02:28:10:917PM | Plasma | Ok | |
| 17 | 02:41:44:860PM | Plasma | Ok | |
| 18 | 02:57:56:553PM | Plasma | Ok | |
| 19 | 03:22:21:220PM | Plasma | Ok | |
| 20 | 03:39:46:023PM | Plasma | Ok | |
| 21 | 03:53:36:840PM | Plasma | Ok | |
| 22 | 04:31:47:887PM | Plasma | Bad | oh1 switch did not fire |
| 23 | 05:04:14:337PM | Plasma | Ok | |
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