| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | John Goetz |
| Physics operator(s): | Earl Marmar |
| Engineering operator(s): | Frank Silva |
| Engineering Operator Run Comment |
| silva/vinnie oh test start |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:50:270PM |
| Author: To Be Determined |
| Summary of 930803 Physics Op: Marmar Assistant: Goetz Engineer: Silva This was a classic Tuesday run. Goals of the run: 1) set up a good discharge for the fast probe experiments: elongated, fat (R ~ 69 cm), moved down (z ~ -2 cm). 2) Piggy-back pellets, laser ablation impurity injection, RF conditioning, I_p feedback. 3) test the effects of ECDC over the weekend, with no ECDC in the morning before the run. There were 8 attempts to make plasma. Of these 2 were good (shots 3 and 7), 2 were fizzles and 4 were duds. All but one of the duds were due to power supply / CAMAC problems. The 2 shots we got had current feedback enabled, and there were some apparent effects, although the control was not evident. On shot 3, the feedback tried to reduce the current late in the shot, possibly contributing to the disruption. On shot 7, we reprogrammed the demand to look more like what we got on shot 3. Shot 7 was a good long shot, although the R and z positions were not in good agreement with what we had asked for. The z_cur controller gain was rather low, which might have been part of the problem, although the I_p feedback may also have been interfering. Had we gotten another shot, the I_p feedback would have been turned off. Problems: The EFC lower coil was not cooling, so we could not use the chopper. EF1U had a ripple problem throughout the day. For most of the run, there were spurious noise spikes on the magnetics and soft x-ray signals from the TRAQ digitizers. They were not present on the hybrid digitized signals. This was traced to a software problem with crate controller software. On shot 2, the EF breakers tripped before commutation, leading to a dud. Shots 4 and 5 were duds for no apparent reason. Shot 6 was a fizzle, with relatively high fill pressure (1.4e-5) After shot 7, the data aquisition did not complete in a timely fashion. During the first attempt to init for shot 8, there was a computer problem. After going back to recool and then init again, the cycle went through but there were many errors. In particular, failure to initialize decoders led to the the result that the bus Rogowski integrators appeared to be resetting throughout the shot. This in turn caused to the hybrid to force extra current out of the EF's, but apparently not up to the PLC-set current limits. The init problems also meant that most of the data from the shot were lost. During the shot, several GFI electrical outlets in the cell tripped, causing a loss of power to 2 TV cameras, and an inner seal pump. These were reset after the shot; the cause was not discovered. At this time ground faults were also discovered. There was a fault with about 20 mA of current flowing from the E section of the support stand to ground. This was traced to ventilation hose, a piece of which was touching the stand under D port. The vessel was also showing a 3 ohm resistance to ground. The cause of this was not determined; it was speculated that it is due to ice at one of the legs. In light of the data aquisition problems, we ran a data aquisition only test shot (9) which was successful. Shot 10 was a power supply test shot with the PLC current limits all set to low values. This showed ripple problems on EF1, OH1 and OH2. Shot 11 was a PLC control test of EF1. The ripple persisted, and it was decided to terminate the physics run to work on the power supply problems. Shot 11 was also used to test the pellet injector, firing 3 small pellets into the chamber. This caused an overpressure alarm on TORVAC, with the vessel pressure rising to approximately 100 millitorr just after the shot. The torus gate valves and pumps did not shut down, and the torus pressure was back to normal after about 1 minute (<1e-6). The RGA showed that approximately 1% of the gas was deuterium, and the rest hydrogen (the pellets are deuterium, the pusher gas is hydrogen). |
| Session Leader Comments | |||
| Aug 3 1993 09:09:53:180AM | John Goetz | RUN 930803
PO: Marmar Asst: Goetz Eng: Silva Today's run is a discharge development run. It is following MP013 in support of MP014 and MP016. Some hoped for accomplishments today are: debug OH1 ripple (engineering) achieve reliable startup make fat low plasmas to match the limiter and the FSP plasma current control (secondary) impurity injection (piggyback) argon puffing (piggyback) pellet injection (piggyback) | |
| Aug 3 1993 09:18:02:180AM | John Goetz | RUN 930803
PO: Marmar Asst: Goetz Eng: Silva Start from shot 930729019 Changes: -load the ZCUR controller from shot 930728025 (has -2 cm movement) change the PID start time from 30 to 50 msec and allow the request for the -3cm program to last from 150msec til the end. -change RCUR controller from 0.64 to 0.66 m -lowered the argon puff -raised PULSE_GAS_2 (the main fueling) and removed the second puff from PULSE_GAS_3 -ZCUR (chopper) PID's zeroed because no EFC coil cooling today -loaded EF2 waveform from 930730014 to compensate for no EFC -loaded IP controller from 930630028 which consists of OH1, EF1L, EF1U, and EF3. PID turns on in steps of 2 from 150 to 260msec. Drawn value of 400kA. | |
| Aug 3 1993 09:20:33:250AM | John Goetz | Shot 930803001
Fizzle 1mT radial field at breakdown For shot 002: Change S_Br from +8.5mT to +7.5mT | |
| Aug 3 1993 09:37:44:690AM | 930803002 | John Goetz | Shot 930803002
Dud EF1 troubles - PF breaker pulled out - commutation failure For shot 003: none for breakdown less ambitious on the IP controller PID values |
| Aug 3 1993 10:09:35:840AM | 930803003 | John Goetz | Shot 930803003
Plasma 450 kAmps - disruptive bad x-ray channel and trouble with the flux loops FFIT says the plasma moves in around 180msec For shot 004: load in plasma waveform from shot 003 for IP and remove the disruption increased PULSE_GAS_2 (main fueling) |
| Aug 3 1993 10:25:03:030AM | 930803004 | John Goetz | Shot 930803004
Dud noise troubles with the flux loops For shot 005: fill pressure to 1.2e-5 from 1.1e-5 |
| Aug 3 1993 11:06:39:100AM | 930803005 | John Goetz | Shot 930803005
Dud things look o.k., should have gone noise troubles with the flux loops - Granetz through the wall to investigate no problems found For shot 006: fill pressure to 1.4e-5 from 1.2e-5 |
| Aug 3 1993 11:32:28:600AM | 930803006 | John Goetz | Shot 930803006
Fizzle still noise on magnetics and x-ray signals. No extra noise on the probes and bolometry signals. For shot 007: fill pressure to 1.0e-5 from 1.4e-5 |
| Aug 3 1993 11:59:50:960AM | 930803006 | John Goetz | Shot 930803007
Plasma - 450kA - 520msec duration couldn't hold the plasma out and couldn't hold it down pellet injector gate valve opened during check - brought the pressure down to 7e-6 - will change to open during INIT For shot 008: no changes |
| Aug 3 1993 02:07:55:270PM | 930803008 | John Goetz | Shot 930803008
Dud many errors in decoder INITs and stores an INIT trouble with the bus rogowski decoder caused a bad integrator reset which in turn put garbage in - garbage out on the hybrid some TV cameras have turned off - heater power GFI's tripped at E,F, & J-port exhaust tube causing ground fault remedied For shot 009: data shot only - no power supplies |
| Aug 3 1993 02:26:48:230PM | 930803009 | John Goetz | Shot 930803009
No data init and store problems Noise is back on the magnetics For shot 010: low current power supply test |
| Aug 3 1993 02:47:51:540PM | 930803010 | John Goetz | Shot 930803010
EF1 commutation failure. Much noise on OH1, OH2's, and EF1's Still some noise on the magnetics For shot 011: EF1 only under PLC control |
| Aug 3 1993 03:27:52:400PM | 930803011 | John Goetz | Shot 930803011
EF1 supply didn't work Pellet fired into vessel - pressure to tens of mTorr For shot 012: Rest of run dedicated to engineering tests of coil systems |
| Physics Operator Comments |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:06:53:560AM | Plasma | Ok | 09:11 first shot |
| 2 | 09:22:22:300AM | Plasma | Bad | commm fail ef1 |
| 3 | 09:39:31:450AM | Plasma | Ok | 450ka |
| 4 | 10:08:47:910AM | Plasma | Ok | no faults |
| 5 | 10:25:17:010AM | Plasma | Ok | |
| 6 | 11:17:56:530AM | Plasma | Ok | |
| 7 | 11:41:50:020AM | Plasma | Ok | good shot |
| 8 | 12:12:26:480PM | Test | Bad | question |
| 9 | 02:13:09:290PM | Test | Ok | test ok |
| 10 | 02:31:43:930PM | Test | Bad | ef1 comm. fail. all supplies current liomi |
| 11 | 03:02:02:700PM | Test | Bad | ef1 still much ripple |
| 12 | 03:34:53:240PM | Test | Ok | data system test |
| 13 | 03:54:27:760PM | Test | Ok | Seems ok |
| 14 | 04:12:32:330PM | Test | Ok | ef1 u+l much better now with V + I currents lowered by .5 |
| 15 | 04:36:32:640PM | Test | Bad | |