| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Robert Granetz |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Frank Silva,Joe Daigle |
| Engineering Operator Run Comment |
| Re-Start C-MOD Aug. 96Granetz/Wolfe/Silva |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:15:837PM |
| Author: To Be Determined |
| Run summary for MP 159A: Re-start C-Mod tokamak SL: R. Granetz PO: S. Wolfe EC: Silva/Daigle Primary goal: Get first plasma after 5 month shutdown. Run lots of fiducial shots. Secondary goal: If successful, use the high number of repeatible fiducial plasmas to test, calibrate, exercise, etc the diagnostics and the ICRF. ------------------------------------------------------------------------------- Summary: It was a tough day. The first half was devoted to working on EFC and EF1 problems, and the second half was spend trying to get a full length plasma. The best we could do were 3 short plasmas and a lot of fizzles and duds. The machine clearly needs a good cleaning. ------------------------------------------------------------------------------- Shot sequence plan: Simple: lots of fiducial shots. ------------------------------------------------------------------------------- Shot 01 -- OH1 & 2 test under PLC control (check coax resistances). All OK Shot 02 -- Supposed to be a plasma shot, but only the OH supplies went, and even one or two of those crowbarred. Shot 03 -- Another attempt at plasma, but EF2's and EFC didn't fire. Engineering claims that everything will be enabled on the next shot. Shot 04 -- Plasma attempt. No breakdown, too much radial field. Also no EFC. Shot 05 -- Fizzle. No EFC. Only 20 kA. Field gradient is a little high, but the Br is alot better. I think it just needs some repetition. Shot 06 -- EF1 test. Shot 07 -- Another EF1 test, this time under hybrid control. Shot 08 -- Another EF1 test. Shot 09 -- Another EF1 test. Shot 10 -- Test of all PF supplies. EF1's looked good. Shot 11 -- Plasma. Ip=0.27 MA. Died at 0.1 s because EFC didn't turn on. Shot 12 -- Dud. EFC finally worked. Shot 13 -- Dud. All supplies fired. Still some problems with EF1's. Shot 14 -- Fizzle. Shot 15 -- Plasma. Ip=0.29 MA. Died at 0.1 s. OH2U faulted then. Shot 16 -- Dud. No changes were made between this shot and the previous one. Shot 17 -- Fizzle. Shot 18 -- Fizzle. Shot 19 -- Fizzle. Shot 20 -- Plasma. Ip=0.55 MA, duration=0.18 s (disrupted). Shot 21 -- Fizzle. Shot 22 -- Fizzle. Shot 23 -- Fizzle. End of run |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:56:363PM |
| Author: To Be Determined |
| Physics Operator Summary for Monday 960805 MP#159A Start up August 1996 SL: Granetz PO: Wolfe EO: Silva/Daigle The goal of today's run was to get reproducible plasmas and then run a series of shots for diagnostic alignment and calibration. This goal was NOT accomplished. After a lot of power supply problems, we succeeded in getting a breakdown, and a couple of current rises, but never got to programmed flattop current. Each partially successful plasma brought off a considerable load of dirt, with a number of subsequent fizzles. The longest plasma was shot 20, which reached 600kA at .18 seconds. We began the day late, as the alternator was not ready until 9:30. The standard OH test was ok. We then had a couple of failed attempts at plasma on which not all supplies fired. The first shot on which all the main supplies came on was #4. The EFC was still not working, and the EF1L was showing the same symptoms as on Friday, basically not following the hybrid demand. On shot 5 we increased the Br0 program level and got a flash. We then began a long sequence of trying to trace and fix the EF1L problem. Shots 6-10 were EF1 tests with various other supplies off. See Logbook for confusing details. Lots of ghosts were chased, none caught. Shot 11 was still trying to diagnose the EF1L problem, but with everything firing. We got a plasma, 250kA disrupting at .11sec or so. EF1 was still screwed up and EFC still not working. The lack of EFC probably would have killed the plasma anyway, but it had enough problems of its own. On shot 12-13 EFc was fixed, but we got duds. In addition to the blown fuses found in the 30V supply after the first shot (4), there were fried resistors on the ON-pulse board in the chopper. The cause of these is unknown, but once the board was replaced the chopper worked. Shot 14, after some board swapping and increasing the margin angle on both EF1 supplies, the EF1s finally behaved. The time was 15:30. Whether it was actually fixed, or just decided to start working on its own is debatable. This problem may come back to haunt us. The shot produced a fizzle. For shot 15, increased the pre-puff and got a plasma similar to 11, short and resistive. Shot 16 was a repeat and gave a dud. Shot 17 I eliminated the 100V point on PG3 around t=0. This shot fizzled. It was noted that the EF4 current was not getting to flattop, and that the Bz was somewhat too negative. It was not noted, by me at least, that getting it to flattop would increase the negative Bz, not decrease it. Therefore, for shot 18 I increased the gain on IC_EF4 from 5 to 8, and ended up with another fizzle with poorer vertical field. I then reduced the program value from -1180 to -1140. This one also fizzled, but the breakdown was earlier. For shot 20 I tried increasing the vertical field by upping the OH1 current, which would also help with the field gradient. Shot 20 was the best shot of the day, which isn't saying much; it got almost 600kA and lasted to almost 200msec, but was horribly resistive. The surface voltage was about 4V. Shot 21-23 were all fizzles, apparently because of all the junk evolved on shot 20. Other problems, issues: ----------------------- We had no ECDC before the run or over the weekend, because the PEI is defunct. The plasmas we did get were extremely dirty. We need to get the ECDC back online. For most of the day we had OH coax resistance warnings (>1uohm). These finally went away at 16:00, as the OH2L coax finally came down below 1uohm. Strong cooling of the stack is the key here, apparently. By that time we were banging away at the plasma-fizzle-fizzle-fizzle cycle, and the OH1 coax began increasing resistance; there was another warning on the last shot at 17:01. Hopefully these warnings will go away when we get the cooling under control. Assessment: ------------ Supplies were not really working until around 15:30. In the last hour and a half of the run we ran about nine shots, and were probably making progress in cleaning up. Some ECDC would help, but even without it another few hours of banging away tomorrow should put us in reasonable shape, if we don't have more supply problems. We need to find out why the EFC died again today, after having been fixed on Friday; apparently turning the supply off or on may be doing it in. Scorecard: --------- PLasmas 3 Fizzles 8 Duds 6 (2 pwr supply failures) tests 6 ------ -- total 23 |
| Session Leader Comments | |||
| Aug 4 1996 11:26:41:600AM | Robert Granetz | SL: R. Granetz
PO: S. Wolfe EC: V. Bertolino Primary goal: Get first plasma after 5 month shutdown. Run lots of fiducial shots. Secondary goal: If successful, use the high number of repeatible fiducial plasmas to test, calibrate, exercise, etc the diagnostics and the ICRF. | |
| Aug 5 1996 09:55:57:950AM | 960805001 | Robert Granetz | Shot 01 -- OH1 & 2 test under PLC control (check coax resistances).
All OK |
| Aug 5 1996 10:08:09:560AM | 960805002 | Robert Granetz | Shot 02 -- Supposed to be a plasma shot, but only the OH supplies went, and
even one or two of those crowbarred. |
| Aug 5 1996 10:30:09:490AM | 960805003 | Robert Granetz | Shot 03 -- Another attempt at plasma, but EF2's and EFC didn't fire.
Engineering claims that everything will be enabled on the next shot. |
| Aug 5 1996 10:54:04:200AM | 960805004 | Robert Granetz | Shot 04 -- Plasma attempt. No breakdown, too much radial field. Also no EFC.
|
| Aug 5 1996 11:06:31:720AM | 960805005 | Robert Granetz | Shot 05 -- Fizzle. No EFC. Only 20 kA. Field gradient is a little high,
but the Br is alot better. I think it just needs some repetition. |
| Aug 5 1996 11:28:18:770AM | 960805006 | Robert Granetz | Shot 06 -- EF1 test.
|
| Aug 5 1996 11:54:46:140AM | 960805007 | Robert Granetz | Shot 07 -- Another EF1 test, this time under hybrid control.
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| Aug 5 1996 12:52:37:480PM | 960805008 | Robert Granetz | Shot 08 -- Another EF1 test.
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| Aug 5 1996 12:59:08:710PM | 960805009 | Robert Granetz | Shot 09 -- Another EF1 test.
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| Aug 5 1996 01:10:01:370PM | 960805010 | Robert Granetz | Shot 10 -- Test of all PF supplies. EF1's looked good.
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| Aug 5 1996 01:26:23:320PM | 960805011 | Robert Granetz | Shot 11 -- Plasma. Ip=0.27 MA. Died at 0.1 s because EFC didn't turn on.
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| Aug 5 1996 03:02:24:550PM | 960805012 | Robert Granetz | Shot 12 -- Dud. EFC finally worked.
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| Aug 5 1996 03:20:00:190PM | 960805013 | Robert Granetz | Shot 13 -- Dud. All supplies fired. Still some problems with EF1's.
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| Aug 5 1996 03:29:30:700PM | 960805014 | Robert Granetz | Shot 14 -- Fizzle.
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| Aug 5 1996 03:43:04:950PM | 960805015 | Robert Granetz | Shot 15 -- Plasma. Ip=0.29 MA. Died at 0.1 s. OH2U faulted then.
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| Aug 5 1996 03:56:13:560PM | 960805016 | Robert Granetz | Shot 16 -- Dud. No changes were made between this shot and the previous one.
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| Aug 5 1996 04:05:45:470PM | 960805017 | Robert Granetz | Shot 17 -- Fizzle.
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| Aug 5 1996 04:16:03:860PM | 960805018 | Robert Granetz | Shot 18 -- Fizzle.
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| Aug 5 1996 04:25:26:490PM | 960805019 | Robert Granetz | Shot 19 -- Fizzle.
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| Aug 5 1996 04:38:14:850PM | 960805020 | Robert Granetz | Shot 20 -- Plasma. Ip=0.55 MA, duration=0.18 s (disrupted).
|
| Aug 5 1996 04:45:31:590PM | 960805021 | Robert Granetz | Shot 21 -- Fizzle.
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| Aug 5 1996 04:50:36:710PM | 960805022 | Robert Granetz | Shot 22 -- Fizzle.
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| Aug 5 1996 04:58:51:890PM | 960805023 | Robert Granetz | Shot 23 -- Fizzle.
End of run |
| Physics Operator Comments | |||
| Aug 5 1996 08:24:56:400AM | Steve Wolfe | Run 960805
MP 159A First plasma run of new campaign SL: granetz PO: wolfe EO: Silva/Daigle COldstart at 08:00. Load 960227003. Engineering instructions: ------------------------- If possible, ECDC in D2 - t possible Engineering setup as for 960227003 EF4 coils in series. ote: From the power tests run on Friday, it appears that EF1L is not following the hybrid demand very well (see scope printout left by SENSEI). Power Systems Engineers should be prepared to instrument and diagnose this problem, if it is still there when we start trying for plasma. | |
| Aug 5 1996 08:25:24:080AM | Steve Wolfe | Run 960805
MP 159A First plasma run of new campaign SL: granetz PO: wolfe EO: Silva/Daigle Run Plan: --------- The purpose of this run is to get plasmas and run a series of reproducible shots for clean-up and diagnostic alignment and calibration. All power supplies have been exercised, separately and together, under hybrid control, as of last Friday. With the possible exception of an EF1L problem noted above, all power systems appear to be ready for operation in the standard configuration. The new pulse-width modulation gas pulse driver for Pulse-gas#3 (K-side valve) was installed and checked out on Saturday, after a problem with the hybrid output to this valve had been repaired. The new gas valve driver has been set up to have approximately linear response above a program voltage of 20V (i.e. 20% full scale). This means the valve will be somewhat more sensitive at low input levels than the previous pulse-rate modulator board, so some changes in gas programming will likely be necessary. The other gas drivers are on direct drive from the hybrid waveform, as they have always been. | |
| Aug 5 1996 08:27:39:700AM | Steve Wolfe | Run 960805
MP 159A First plasma run of new campaign SL: granetz PO: wolfe EO: Silva/Daigle If we are successful in obtaining reasonable clean full-length plasmas, we will spend the remainder of the run on repeat shots. A number of diagnostic systems have expressed interest in carrying out alignment and calibration during sucvh a sequence, including HIREX,ECE, U. Md. Spectrometer,NPA,FSP, Impurity injector, and McPherson alignment. (Ar will be provided for HIREX alignment only if machine cleanliness is sufficient to allow non-disruptinve operation with Ar added). To the extent possible consistent with these activities, we would like for some of the spectroscopic diagnostics to monitor the cleanup of the plasmas during this sequence, which will consist of standard fiducial parameters. If the RF wishes to begin conditioning activities during this time, they should fire late in the pulse to avoid complications with diagnostic activities. | |
| Aug 5 1996 08:27:56:340AM | Steve Wolfe | Run 960805
MP 159A First plasma run of new campaign SL: granetz PO: wolfe EO: Silva/Daigle The plan for subsequent runs will depend on the degree of success of this run, which may have to be continued on Tuesday. | |
| Aug 5 1996 09:52:41:550AM | 960805001 | Steve Wolfe | 960805001:
OH test. Currents ok. no warnings on coax resistance. |
| Aug 5 1996 10:09:54:310AM | 960805002 | Steve Wolfe | 960805002:
Try for plasma. PF breaker pulled. No EF1,No Ef3, No EFc, No TF. |
| Aug 5 1996 10:33:18:560AM | 960805003 | Steve Wolfe | 960805003:
The shot counter may be screwed up. JAS is investigating. Try for plasma again. No EF2's. Also EFC. EF1L still overdoing it. |
| Aug 5 1996 10:48:38:910AM | 960805004 | Steve Wolfe | 960805004:
Try for plasma again. Still no EFc. No flash Some negative Br. EF1L is overshooting a bit. |
| Aug 5 1996 11:08:09:870AM | 960805005 | Steve Wolfe | 960805005:
Increase Br0 offset from .0055 to .007 Got a flash. Chokes and hits something at 17msec. Seems to be moving in. Still seems to have a small negative radial field as well. EFc still didn't work correctly. Still getting OH coax resistance warnings. |
| Aug 5 1996 11:33:05:140AM | 960805006 | Steve Wolfe | 960805006:
Br0 from .007 to .0075. Reduce gas pre-pulse from 14msec to 12msec. Not loaded into model yet. This shot will be a PLC only pulse of EF1L to try to diagnose that problem. EFC still not right; they can't find a problem. Some small overshoot on EF1L, but inconclusive. Next shot try hybrid control, EF1's only. |
| Aug 5 1996 12:47:40:390PM | 960805007 | Steve Wolfe | 960805007:
Br0 from .007 to .0075. Reduce gas pre-pulse from 14msec to 12msec. Not loaded into model yet. EF1's only. Hybrid control. It seems to be ok this way. EF1 is the first to come on; how can it know the others aren't enabled??????? |
| Aug 5 1996 12:52:53:370PM | 960805007 | Steve Wolfe | 960805007:
Br0 from .007 to .0075. Reduce gas pre-pulse from 14msec to 12msec. Not loaded into model yet. EF1's only. Hybrid control. Same as 7, but close all the breakers. Still looks ok? So much for that idea. |
| Aug 5 1996 12:54:11:130PM | 960805008 | Steve Wolfe | 960805008:
Br0 from .007 to .0075. Reduce gas pre-pulse from 14msec to 12msec. Not loaded into model yet. EF1's only. Hybrid control. Same as 7, except all breakers in. Still ok. So much for the breaker idea. |
| Aug 5 1996 12:59:19:530PM | 960805009 | Steve Wolfe | 960805009:
Br0 from .007 to .0075. Reduce gas pre-pulse from 14msec to 12msec. Not loaded into model yet. EF1's only. Hybrid control. Same as 8, all breakers in, cap banks charged. Still fine. Maybe it's fixed itself. |
| Aug 5 1996 01:08:51:880PM | 960805010 | Steve Wolfe | 960805010:
Br0 from .007 to .0075. Reduce gas pre-pulse from 14msec to 12msec. Not loaded into model yet. All PF's.No TF. Hybrid control. all breakers in, cap banks charged. Still starts off ok. There is a deviation at -.6sec |
| Aug 5 1996 01:26:49:550PM | 960805011 | Steve Wolfe | 960805011:
Br0 from .007 to .0075. Reduce gas pre-pulse from 14msec to 12msec. Not loaded into model yet. All PF's.and TF. Hybrid control. all breakers in, cap banks charged. Basically, a full shot. This time they have instrumented some points in the EF1L supply. Plasma - 250kA, disrupts after .1sec. We need the EFc. The EF1 still didn't do its thing at -1.2, but the problem around -.5sec is still there. |
| Aug 5 1996 03:02:21:630PM | 960805012 | Steve Wolfe | 960805012:
PUt BR0 and gas backj the way they were in scratch; never loaded it. There is a hot chip on the control board in EF1L supply. Daigle is dealing. Andy and Sam are looking into EFC Set up again. The boards from EF1U and EF1L may have been swapped. EFC may have been fixed. No flash. EFC is workiong again. |
| Aug 5 1996 03:29:15:360PM | 960805013 | Steve Wolfe | 960805013:
INcrease margin angle on both EF1's. Swapped boards? Still no flash. Where'd it go? |
| Aug 5 1996 03:57:16:950PM | 960805015 | Steve Wolfe | 960805015:
INcrease prepulse from 14msec to 16msec PLasma- PF crowbar. Has a vertical problem. EFIT is not working. Don't know why. |
| Aug 5 1996 04:12:14:540PM | 960805017 | Steve Wolfe | 960805017:
Get rid of early high voltage point on PG3. flash, no rise. late breakdown. EF4 only got to 1114 A this time. |
| Aug 5 1996 04:19:35:660PM | 960805018 | Steve Wolfe | 960805018:
INcrease gain on IC_EF4 from 5 to 8. fizzle. EF4 at 1150 this time. Still a late breakdown Clearly too negative Bz this time. |
| Aug 5 1996 04:40:02:930PM | 960805020 | Steve Wolfe | 960805020:
Increase IC_OH1 from -16600 to -16700 plasma - 600kA. .18sec. |
| Aug 5 1996 04:45:02:560PM | 960805021 | Steve Wolfe | 960805021:
Repeat. fizzle. b.d. around 10msec. |
| Aug 5 1996 04:52:13:610PM | 960805022 | Steve Wolfe | 960805022:
Repeat. fizzle - bd at 6msec |
| Aug 5 1996 04:59:07:670PM | 960805023 | Steve Wolfe | 960805023:
Repeat. fizzle. That's all for today. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:43:07:950AM | Test | Ok | Coax Test |
| 2 | 10:04:33:510AM | Test | Bad | |
| 3 | 10:25:57:150AM | Plasma | Bad | NO EF2 or EFC |
| 4 | 10:33:42:630AM | Plasma | Bad | no efc chopper |
| 5 | 10:52:55:330AM | Plasma | Bad | efc chopper not working |
| 6 | 11:24:50:030AM | Plasma | Ok | ef1 plc test ok |
| 7 | 11:36:06:050AM | Plasma | Ok | ef1 u-l hybrid test |
| 8 | 12:49:21:020PM | Plasma | Ok | ef1 ul hybrid test all breakers closed |
| 9 | 12:55:20:920PM | Plasma | Ok | ef1 test ok |
| 10 | 01:02:14:670PM | Plasma | Ok | pf test ok |
| 11 | 01:21:04:420PM | Plasma | Bad | EFc Did not go on ef1 not following command. |
| 12 | 02:55:50:680PM | Plasma | Ok | efc and ef1 no breakdown |
| 13 | 03:14:04:300PM | Plasma | Ok | ef1 u problem |
| 14 | 03:27:27:890PM | Plasma | Ok | OK |
| 15 | 03:38:34:750PM | Plasma | Ok | Self powered Fired OH2 U |
| 16 | 03:54:14:630PM | Plasma | Ok | |
| 17 | 04:03:59:900PM | Plasma | Ok | flash |
| 18 | 04:14:25:470PM | Plasma | Ok | |
| 19 | 04:23:39:230PM | Plasma | Ok | |
| 20 | 04:32:16:530PM | Plasma | Ok | |
| 21 | 04:40:56:030PM | Plasma | Ok | |
| 22 | 04:48:55:330PM | Plasma | Ok | |
| 23 | 04:57:12:790PM | Plasma | Ok | |