| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Steve Wukitch |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Gary Dekow,Bill Cochran |
| Engineering Operator Run Comment |
| Machine Conditioning with RF; SL: Wukitch; PO: Granetz; EO: Cochran/Deko |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:29:397PM |
| Author: To Be Determined |
| Run 1020711: Machine and RF Conditioning Campaign Continued EO: Cochran/Dekow PO: Granetz SL: Irby/Wolfe After three days of work on the RAID disk system we were able to run the machine again today. The purpose of this run was to continue conditioning of the machine with rf power if possible. ECDC was run almost continuously since the 7/02 run. In addition we have baked the machine at 60C for several days. The H/D ratio was down another 2% or so today compared to last week. The plasma disrupted at 0.444 s on shot 06 following a disruption at 1.4 s on shot 05. Both H/D and the carbon II were up a factor of 2 at 0.4 s compared to shots earlier today. Using the Granetz startup we were able to get four plasmas in a row. We stopped early today so that rf could continue to debug their electronics. Duds none Fizzles none Plasmas 03,04,05,06 Tests 01,02 |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:15:287PM |
| Author: To Be Determined |
| Physics operator summary for run 1020711 (Thursday): Session leader: S. Wukitch Physics operator: R. Granetz Engineer in charge: G. Dekow/B. Cochran Summary: Although the tokamak ran well, going 4 for 4 on plasma startup, the data systems had some problems, and the RF needed more time without plasma operation to make better progress. So we stopped the run early to accommodate them. H/D was 8-10%. The plasma didn't like running at higher densities, and disrupted when the gas fueling got really strong. Scorecard: 4 plasmas 0 fizzles 0 duds 2 tests 0 aborted and/or screwed up by computer problems ---------- 6 total ------------------------------------------------------------------------------- Engineering setup for Thursday 11 July 2002 Session leader: S. Wukitch (surprise Steve!) Physics operator: R. Granetz ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Set up for possible ECDC in D2 between shots. Run begins at 11:00 (note the delayed start) and ends at 17:00. Power systems the same as for shot 1020702024. Note: We'll have to start with an OH test to check out the data acquisition system, as well as hardware changes made to the magnetics. Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) leave J-Bottom as is Hybrid DISABLED (PG5) Enable the following gate valves, assuming no vacuum problems: DNB, ECE ------------------------------------------------------------------------------- Run Plan: Note the delayed starting time for the run. The RF will be firing into vacuum for the first few hours of the morning before the run begins. The cell will be open until around 11:00. First shot will be an OH test to check the data acquisition system, as well as hardware changes made to the magnetics. Then load shot 1020628023 (standard SNL, 0.8 MA, 5.3 T, 1.e20 m-2) and pick up where we left off. Over the past 2 weeks of operation, we have developed two different startup scenarios: Ian's (segment 1 of 1020702024) and non-Ian's. I'll start with non-Ian's, confirm its reliability, and then perhaps switch to Ian's and compare reliabilities. RF will probably be firing J-port into plasma, in which case we may want to do between-shot ECDC. ------------------------------------------------------------------------------- Overnight ECDC in D2 was done. Hybrid coldstart done; no errors found Loaded PCS from shot 1020628023 for segment 1 and shot 1020702024 for segment 2, and confirmed that density feedback is turned off, per Jim Irby's request. ------------------------------------------------------------------------------- Shot 01 -- Test. OH and EF1 only, under PLC control ... to check data system and also magnetics hardware changes. Next shot: we need another test the check BP15_BC, which had too low a signal level. Between-shot ECDC is being done now. Shot 02 -- Test. EF3 only under PLC control. This is to check the signal on BP15_BC, which had strangely low amplitude on shot 01. BP15_BC looks okay (by comparison to BP15_DE). Next shot: go for plasma. Shot 03 -- Plasma. Good shot. 0.8 MA, 5.3 T, 0.6e20 m-2, SNL. The density feedback signal is inverted, so Jim will fix that for the next shot. H/D=0.09. Next shot: turn on density feedback and increase density to 1.e20 m-2. Shot 04 -- Plasma. Good shot. nl_04=1.0e20 m-2, as requested. H/D=0.08-0.10. Density feedback worked well. Next shot: raise density to nl_04=1.2e20 m-2. Shot 05 -- Plasma. Lots of DAQ failures...no Ip signal available. Disrupted at 1.4 s. Mag_TR16_3 didn't receive trigger. H/D didn't go because of the missing Ip signal. I ran a test shot after the plasma shot and TR16_3 failed to trigger again. Steve and I went down and unplugged/plugged in the TR16_3 trigger cable, ran a test shot, and it's now okay. Next shot: repeat at same density to get H/D (it needs Ip) Shot 06 -- Plasma. Disrupted at t=0.44 s. Ip was starting to turn over, so it may have been due to too much gas. We're going to stop here and let the RF have the time. We're 4 for 4 on plasma startup, using the non-IHH segment 1. End of run. |
| Session Leader Comments | |||
| Jul 11 2002 12:22:34:860PM | 1020711003 | Jim Irby | Plasma H/D 9% at 1s nl04 feedback signal went negative --- see TCI topic |
| Jul 11 2002 12:34:54:943PM | 1020711004 | Jim Irby | Plasma --- asked for 1e20/m^2 H/D .086 |
| Jul 11 2002 03:30:15:017PM | 1020711005 | Jim Irby | Requested higher density Disrupted at 1.43 s --- probably trying too hard to get high density at 800 kA Lost a lot of data: Ip for example H/D 9% at 1 s |
| Jul 11 2002 01:59:24:410PM | 1020711006 | Jim Irby | Repeat at same nl04 request Plasma for 0.444 s H/D 17% at .4 s --- factor of 2 up from shot 004 Carbon II also up a factor of 2 following the disruption |
| Physics Operator Comments | |||
| Jul 11 2002 09:14:32:697AM | Robert Granetz | Engineering setup for Thursday 11 July 2002 Session leader: S. Wukitch (surprise Steve!) Physics operator: R. Granetz ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Set up for possible ECDC in D2 between shots. Run begins at 11:00 (note the delayed start) and ends at 17:00. Power systems the same as for shot 1020702024. Note: We'll have to start with an OH test to check out the data acquisition system, as well as hardware changes made to the magnetics. Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) leave J-Bottom as is Hybrid DISABLED (PG5) Enable the following gate valves, assuming no vacuum problems: DNB, ECE | |
| Jul 11 2002 09:14:53:370AM | Robert Granetz | Run Plan: Note the delayed starting time for the run. The RF will be firing into vacuum for the first few hours of the morning before the run begins. The cell will be open until around 11:00. First shot will be an OH test to check the data acquisition system, as well as hardware changes made to the magnetics. Then load shot 1020628023 (standard SNL, 0.8 MA, 5.3 T, 1.e20 m-2) and pick up where we left off. Over the past 2 weeks of operation, we have developed two different startup scenarios: Ian's (segment 1 of 1020702024) and non-Ian's. I'll start with non-Ian's, confirm its reliability, and then perhaps switch to Ian's and compare reliabilities. RF will probably be firing J-port into plasma, in which case we may want to do between-shot ECDC. | |
| Jul 11 2002 10:45:10:163AM | Robert Granetz | Overnight ECDC in D2 was done. Hybrid coldstart done; no errors found Loaded PCS from shot 1020628023 for segment 1 and shot 1020702024 for segment 2, and confirmed that density feedback is turned off, per Jim Irby's request. | |
| Jul 11 2002 11:46:16:493AM | 1020711001 | Robert Granetz | Shot 01 -- Test. OH and EF1 only, under PLC control ... to check data system and also magnetics hardware changes. Next shot: we need another test the check BP15_BC, which had too low a signal level. Between-shot ECDC is being done now. |
| Jul 11 2002 11:47:37:870AM | 1020711002 | Robert Granetz | Shot 02 -- Test. EF3 only under PLC control. This is to check the signal on BP15_BC, which had strangely low amplitude on shot 01. BP15_BC looks okay (by comparison to BP15_DE). Next shot: go for plasma. |
| Jul 11 2002 12:08:26:293PM | 1020711003 | Robert Granetz | Shot 03 -- Plasma. Good shot. 0.8 MA, 5.3 T, 0.6e20 m-2, SNL. The density feedback signal is inverted, so Jim will fix that for the next shot. H/D=0.09. Next shot: turn on density feedback and increase density to 1.e20 m-2. |
| Jul 11 2002 12:49:51:870PM | 1020711004 | Robert Granetz | Shot 04 -- Plasma. Good shot. nl_04=1.0e20 m-2, as requested. H/D= Density feedback worked well. H/D=0.08-0.10. Next shot: raise density to nl_04=1.2e20 m-2. |
| Jul 11 2002 01:27:02:943PM | 1020711005 | Robert Granetz | Shot 05 -- Plasma. Lots of DAQ failures...no Ip signal available. Disrupted at 1.4 s. Mag_TR16_3 didn't receive trigger. H/D didn't go because of the missing Ip signal. I ran a test shot after the plasma shot and TR16_3 failed to trigger again. Steve and I went down and unplugged/plugged in the TR16_3 trigger cable, ran a test shot, and it's now okay. Next shot: repeat at same density to get H/D (it needs Ip) |
| Jul 11 2002 05:10:53:407PM | 1020711006 | Robert Granetz | Shot 06 -- Plasma. Disrupted at t=0.44 s. Ip was starting to turn over, so it may have been due to too much gas. We're going to stop here and let the RF have the time. We're 4 for 4 on plasma startup, using the non-IHH segment 1. End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 11:04:55:087AM | Test | Ok | oh1, oh2u-l, ef1u-l Test |
| 2 | 11:36:15:930AM | Test | Ok | ef3 only |
| 3 | 11:53:03:707AM | Plasma | Ok | |
| 4 | 12:20:15:857PM | Plasma | Ok | |
| 5 | 12:54:09:363PM | Plasma | Ok | |
| 6 | 01:28:16:103PM | Plasma | Bad | OH1 self powered crkt fired |
| 7 | 03:02:23:863PM | Test | Ok | Cycle Test for magnetics |
| 8 | 03:26:57:980PM | Test | Ok | Cycle Test for magnetics |
| 9 | 03:39:58:923PM | Test | Ok | cycle test |
| 10 | 03:52:32:253PM | Test | Ok | cycle test |