| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | John Rice |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Bill Parkin,Ed Fitzgerald,Bill Cochran |
| Engineering Operator Run Comment |
| MP#289A Double Barrier,MP#137 L-H-L transitionsSL:Rice,Hubbard PO:Granet |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:27:383PM |
| Author: To Be Determined |
| Session Leader Run Summary for 1010718 MP289A Double Barrier Studies Again several double barrier plasmas were formed at 4.5 T using D and E port; however J-port was essentially unavailable so not much headway was made into MP289A. The run began late, with the first plasma after 1 PM. Most of the shots were spent trying to arrest the density and impurity increase by reramping the TF, similar to shot 1010717017 but all plasmas suffered H-L transitions which destroyed the ITBs. Perhaps the problem was due to high radiation. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:13:880PM |
| Author: To Be Determined |
| Physics operator summary for run 1010718 (Wednesday): MP #289A -- Double Barrier MP #137 -- L-H-L transitions (standby) Session leader: J. Rice (A. Hubbard for standby MP) Physics operator: R. Granetz Engineer: W. Cochran/E. Fitzgerald/W. Parkin Summary: We stayed with MP #289A for the whole run, but plasma operation didn't begin until 13:00, because a failed OH2 shunt had to be removed. When we finally did get going, the machine ran well, with only 2 fizzles and no duds. We did ECDC between nearly all shots. Most of the PCS work today involved varying the temporal behavior of the toroidal field, using varies rampups from 4.5 to 5.4 T. This had a noticeable effect on the H-L back-transition. See John Rice's run summary for more details. H/D was kept at 8% for shots with 2 MW of RF, 10% for shots with 2.5 MW (all from D and E antennas). J-antenna only got up to 300 kW for short pulses. Scorecard: 10 plasmas 2 fizzles 0 duds 2 tests 0 aborted and/or screwed up by computer problems ---------- 14 total ------------------------------------------------------------------------------- Engineering setup for Wednesday 18 July 2001 ECDC in D2 overnight, stopping by 8:00 am. ******************************************************************************* * If the ICRF does vacuum conditioning of J-port before the run, we will * * want to do at least 30 minutes of ECDC in D2 just prior to plasma * * operation. * ******************************************************************************* Run begins at 09:00 and ends at 17:00, unless there are delays required by the pumping/purging of the J-port line. Power systems the same as for shot 1010717016. 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) fill J-Bottom with 30 psi He Hybrid DISABLED(PG5) Enable the following gate valves, assuming no vacuum problems: ECE, DNB, VUV ------------------------------------------------------------------------------- RF Setup: Transmitters 1 and 2 in run-on started at 08:00. Transmitters 3 and 4 in run-on started at 08:00. RF Waveforms: same as on 1010717016 (2+ MW from D+E, flat from t=0.6 to 1.5 s ------------------------------------------------------------------------------- Run Plan: Pick up where we left off on Tuesday. Start with shot 1010717016. Try to optimize the off-axis core barrier with D and E at 80 MHz. J-port tuning at 70 MHz will be done in background (i.e. toward the end of each shot). If the double barrier experiments are completed and J-port is not ready to proceed, then Amanda's MP #137 (L-H-L transitions) will be started. ------------------------------------------------------------------------------- Overnight ECDC in D2 was done. Hybrid coldstart done; no errors found Loaded PCS from shot 1010717016, no changes made. ------------------------------------------------------------------------------- The start of the run is delayed to 10:00 in order to fix an OH2 shunt, and to work on the RF. The first shot will be a 10 kA OH test to check the new shunt. Shot 01 -- Test. No-power shot cycle. PF fault occurred during INIT. Next shot: OH test (with power) Shot 02 -- Test. 10 kA OH test to check the new shunt. All OK. Next shot: go for plasma, after first doing 20 minutes of ECDC (J-port did some vacuum conditioning this morning.) 20 minutes of ECDC in D2. Shot 03 -- Fizzle. Next shot: increase pre-fill puff by 2 ms. ECDC in D2 between shots. Shot 04 -- Plasma. Good shot. Ip=0.8 MA, Btor=4.5 T, nl_04(target)=1.0e20 m-2 Good core barrier. Prf=2 MW, equally from D and E. Next shot: ramp Btor back up to 5.4 T starting at t=0.85 s (like shot 17 from yesterday). Also reduce pre-fill puff by 1 ms. ECDC in D2 between shots. Shot 05 -- Plasma. Disrupted at t=0.62 s, just after the RF turns on. Looks like an impurity injection killed it. Nothing seen in the wide angle camera view. Next shot: try again, no changes. ECDC in D2 between shots. Shot 06 -- Plasma. Good shot. Btor ramps back up and reaches 5.4 T at t=1.0 s. Short ITB, followed by a standard EDA. Prf=2.0 MW. Next shot: repeat, no changes ECDC in D2 between shots. Short cell access for TS, DNB, XTOMO Shot 07 -- Plasma. Good shot. Virtually identical ITB and EDA behavior as the previous shot. H/D has been holding at 8% during the RF pulse for all of the plasmas today. Next shot: move Btor rampup earlier by 100 ms, to see whether this has something to do with triggering the end of the ITB. ECDC in D2 between shots. Shot 08 -- Plasma. Disrupted at t=1.40 s. ITB H-L back transition is earlier on this shot, seemingly caused by the Btor rampup. Next shot: cut the Btor ramp rate. (Start rampup at t=0.75, as before, but end the rampup at t=1.10 s.) ECDC in D2 between shots. Shot 09 -- Fizzle. Weak. Pressure is high. Next shot: reduce pre-fill puff by 2 ms. No ECDC in D2 between shots this time. Shot 10 -- Plasma. Back-transition happened a little later this time. No H/D signal this shot. Next shot: start Btor rampup at t=0.85 and stop it at t=1.50. This cuts the ramp rate nearly in half again. ECDC in D2 between shots. Shot 11 -- Plasma. Good shot. Prf=2.0 MW from D and E. H/D=8-10%. Next shot: get rid of Btor rampup entirely (stay at 4.5 T) ECDC in D2 between shots. Shot 12 -- Plasma. Good shot. Only one H-mode/ITB. H/D=8%. Prf=2.0 MW (D+E) Next shot: reset Btor to be the same as on shot 10 (start rampup at t=0.75 and stop rampup at t=1.10 s ECDC in D2 between shots. Shot 13 -- Plasma. Disrupted at t=1.18 s. Looks like an impurity injection. Three H-modes. Prf=2.5 MW, but there were a lot of faults. Wide-angle camera shows an obvious bright spot at the top of D-antenna on the frame before the disruption. Next shot: raise target density by 10% (to nl_04=1.1e20 m-2) ECDC in D2 between shots. Shot 14 -- Plasma. Good shot. Prf=2.5 MW, but E faulted alot. H/D=8-10% End of run. |
| Session Leader Comments | |||
| Jul 18 2001 12:32:15:870PM | 1010718003 | John Rice | fiz |
| Jul 18 2001 01:14:30:373PM | 1010718004 | John Rice | good ITB no J-port |
| Jul 18 2001 01:33:58:363PM | 1010718005 | John Rice | disrupted at 0.6s |
| Jul 18 2001 02:05:31:470PM | 1010718006 | John Rice | ITB, with TF reramp, but H-L at 0.9 s |
| Jul 18 2001 02:41:05:977PM | 1010718007 | John Rice | ITB, with TF reramp, but H-L at 0.9 s |
| Jul 18 2001 02:43:44:030PM | 1010718007 | John Rice | ITB, with TF reramp earlier, and H-L also earlier at 0.8 s |
| Jul 18 2001 02:57:57:603PM | 1010718008 | John Rice | ITB, with TF reramp earlier, and H-L also earlier at 0.8 s |
| Jul 18 2001 03:06:33:230PM | 1010718009 | John Rice | fiz |
| Jul 18 2001 03:23:36:183PM | 1010718010 | John Rice | ITB, slower TF ramp, but still H-L at 0.8 s |
| Jul 18 2001 03:57:23:470PM | 1010718011 | John Rice | ITB, slower TF ramp, but still H-L at 0.88 s |
| Jul 18 2001 04:17:26:960PM | 1010718012 | John Rice | ITB, no TF ramp, but still H-L at 0.88 s |
| Jul 18 2001 04:40:40:550PM | 1010718013 | John Rice | ITB, TF ramp, but still H-L at 0.8 s |
| Jul 18 2001 05:04:19:847PM | 1010718014 | John Rice | ITB, raised density, TF ramp, but still H-L at 0.8 s |
| Physics Operator Comments | |||
| Jul 18 2001 09:12:15:127AM | Robert Granetz | Engineering setup for Wednesday 18 July 2001 ECDC in D2 overnight, stopping by 8:00 am. ******************************************************************************* * If the ICRF does vacuum conditioning of J-port before the run, we will * * want to do at least 30 minutes of ECDC in D2 just prior to plasma * * operation. * ******************************************************************************* Run begins at 09:00 and ends at 17:00, unless there are delays required by the pumping/purging of the J-port line. Power systems the same as for shot 1010717016. 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) fill J-Bottom with 30 psi He Hybrid DISABLED(PG5) Enable the following gate valves, assuming no vacuum problems: ECE, DNB, VUV ------------------------------------------------------------------------------- RF Setup: Transmitters 1 and 2 in run-on started at 08:00. Transmitters 3 and 4 in run-on started at 08:00. RF Waveforms: same as on 1010717016 (2+ MW from D+E, flat from t=0.6 to 1.5 s ------------------------------------------------------------------------------- Run Plan: Pick up where we left off on Tuesday. Start with shot 1010717016. Try to optimize the off-axis core barrier with D and E at 80 MHz. J-port tuning at 70 MHz will be done in background (i.e. toward the end of each shot). If the double barrier experiments are completed and J-port is not ready to proceed, then Amanda's MP #137 (L-H-L transitions) will be started. | |
| Jul 18 2001 09:12:43:707AM | Robert Granetz | Overnight ECDC in D2 was done. Hybrid coldstart done; no errors found Loaded PCS from shot 1010717016, no changes made. | |
| Jul 18 2001 09:12:51:567AM | Robert Granetz | The start of the run is delayed to 10:00 in order to fix an OH2 shunt, and to work on the RF. | |
| Jul 18 2001 11:02:39:243AM | Robert Granetz | The first shot will be a 10 kA OH test to check the new shunt. | |
| Jul 18 2001 11:40:21:850AM | 1010718001 | Robert Granetz | Shot 01 -- Test. No-power shot cycle. PF fault occurred during INIT. Next shot: OH test (with power) |
| Jul 18 2001 11:55:12:080AM | 1010718002 | Robert Granetz | Shot 02 -- Test. 10 kA OH test to check the new shunt. All OK. Next shot: go for plasma, after first doing 20 minutes of ECDC (J-port did some vacuum conditioning this morning.) 20 minutes of ECDC in D2. |
| Jul 18 2001 12:38:12:100PM | 1010718003 | Robert Granetz | Shot 03 -- Fizzle. Next shot: increase pre-fill puff by 2 ms. ECDC in D2 between shots. |
| Jul 18 2001 02:06:30:850PM | 1010718004 | Robert Granetz | Shot 04 -- Plasma. Good shot. Ip=0.8 MA, Btor=4.5 T, nl_04(target)=1.0e20 m-2 Good core barrier. Prf=2 MW, equally from D and E. Next shot: ramp Btor back up to 5.4 T starting at t=0.85 s (like shot 17 from yesterday). Also reduce pre-fill puff by 1 ms. ECDC in D2 between shots. |
| Jul 18 2001 01:36:23:993PM | 1010718005 | Robert Granetz | Shot 05 -- Plasma. Disrupted at t=0.62 s, just after the RF turns on. Looks like an impurity injection killed it. Nothing seen in the wide angle camera view. Next shot: try again, no changes. ECDC in D2 between shots. |
| Jul 18 2001 02:05:40:173PM | 1010718006 | Robert Granetz | Shot 06 -- Plasma. Good shot. Btor ramps back up and reaches 5.4 T at t=1.0 s. Short ITB, followed by a standard EDA. Prf=2.0 MW. Next shot: repeat, no changes ECDC in D2 between shots. Short cell access for TS, DNB, XTOMO |
| Jul 18 2001 03:38:26:930PM | 1010718007 | Robert Granetz | Shot 07 -- Plasma. Good shot. Virtually identical ITB and EDA behavior as the previous shot. H/D has been holding at 8% during the RF pulse for all of the plasmas today. Next shot: move Btor rampup earlier by 100 ms, to see whether this has something to do with triggering the end of the ITB. ECDC in D2 between shots. |
| Jul 18 2001 02:47:51:757PM | 1010718008 | Robert Granetz | Shot 08 -- Plasma. Disrupted at t=1.40 s. ITB H-L back transition is earlier on this shot, seemingly caused by the Btor rampup. Next shot: cut the Btor ramp rate. (Start rampup at t=0.75, as before, but end the rampup at t=1.10 s.) ECDC in D2 between shots. |
| Jul 18 2001 03:13:14:430PM | 1010718009 | Robert Granetz | Shot 09 -- Fizzle. Weak. Pressure is high. Next shot: reduce pre-fill puff by 2 ms. No ECDC in D2 between shots this time. |
| Jul 18 2001 03:36:53:930PM | 1010718010 | Robert Granetz | Shot 10 -- Plasma. Back-transition happened a little later this time. No H/D signal this shot. Next shot: start Btor rampup at t=0.85 and stop it at t=1.50. This cuts the ramp rate nearly in half again. ECDC in D2 between shots. |
| Jul 18 2001 04:04:57:810PM | 1010718011 | Robert Granetz | Shot 11 -- Plasma. Good shot. Prf=2.0 MW from D and E. H/D=8-10%. Next shot: get rid of Btor rampup entirely (stay at 4.5 T) ECDC in D2 between shots. |
| Jul 18 2001 04:28:12:497PM | 1010718012 | Robert Granetz | Shot 12 -- Plasma. Good shot. Only one H-mode/ITB. H/D=8%. Prf=2.0 MW (D+E) Next shot: reset Btor to be the same as on shot 10 (start rampup at t=0.75 and stop rampup at t=1.10 s ECDC in D2 between shots. |
| Jul 18 2001 05:52:35:767PM | 1010718013 | Robert Granetz | Shot 13 -- Plasma. Disrupted at t=1.18 s. Looks like an impurity injection. Three H-modes. Prf=2.5 MW, but there were a lot of faults. Wide-angle camera shows an obvious bright spot at the top of D-antenna on the frame before the disruption. Next shot: raise target density by 10% (to nl_04=1.1e20 m-2) ECDC in D2 between shots. |
| Jul 18 2001 05:34:42:310PM | 1010718014 | Robert Granetz | Shot 14 -- Plasma. Good shot. Prf=2.5 MW, but E faulted alot. H/D=8-10% End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 11:35:17:747AM | Test | Bad | OH PLC Test, Aborted due to erroneous OH2L type 1 flt |
| 2 | 11:49:43:150AM | Test | Ok | OH PLC Test |
| 3 | 12:24:11:073PM | Plasma | Ok | |
| 4 | 12:56:11:573PM | Plasma | Ok | |
| 5 | 01:23:03:360PM | Plasma | Ok | |
| 6 | 01:47:13:937PM | Plasma | Ok | |
| 7 | 02:12:26:330PM | Plasma | Ok | |
| 8 | 02:37:37:127PM | Plasma | Ok | |
| 9 | 03:03:03:723PM | Plasma | Ok | |
| 10 | 03:18:06:783PM | Plasma | Ok | |
| 11 | 03:48:43:327PM | Plasma | Ok | |
| 12 | 04:15:03:000PM | Plasma | Ok | |
| 13 | 04:38:06:390PM | Plasma | Ok | |
| 14 | 05:02:18:500PM | Plasma | Ok | |