| Miniproposals | ||||||||||||
| ||||||||||||
|
| Operators | |
| Session leader(s): | Steve Wukitch,Amanda Hubbard,Steve Wolfe |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Bill Parkin,Bill Cochran |
| Engineering Operator Run Comment |
| Granetz/Cochran |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:26:290PM |
| Author: To Be Determined |
| Session Leader Summary for part 1 of 1010530 SL: wolfe,boivin PO: Granetz EO: Cochran,Parkin Run Plan: Plasma conditioning, DNB conditioning MP 214: D & E antenna conditioning MP 287: ASDEX non-dimensional comparison (possible piggyback) Start from most recent shot (1010525021), except re-program Ip to be flat. The density will be raised during the morning to try and reduce the H/D ratio, in preparation for next week's boronization. Helium will be puffed for DNB/CXRS. RF will start off with D and E antennas, with the possibility of also turning on J. If we get around to MP 287, Amanda will specify the desired shapes, which mostly involve reducing the triangularity. Results: -------- Things got off to an exciting start when the Oh2 supplies went berserk on shot#1. The problem was traced to the DC supply for the magnetics integrators, which had fried itself, causing unintegrated signals to go to the hybrid feedback inputs. The supply was replaced, and we ran a PLC test shot to confirm things were working. Shot #3-6 were duds, although the fields looked good; we made a minor tweak to EF4 and raised the pre-puff on each of these, to no avail. Finally, Bob tried lowering the pre-puff on shot#7, and that resulted in a full length plasma, with a bouncing startup. H/D was not bad, at 0.35; the ECDC and bake since the last run may have helped. The oh2L coax resistance went over 2uOhm again after the unpleasantness on shot 1, but recovered after a few shots. That's the good news. We then raised the density to 1.0e20, so the valve would stay on. This worked, but at 1.1-1.2sec the density again had an uncontrolled rise. Brian confirmed that this was a detachment. We also began developing a low-triangularity shape for the ASDEX simulation, but this was not completed. The run was plagued by continued unexplained duds (#10, 11, 12, 14, 15). After shot 12 we ran ECDC and did not do RF conditioning of J-antenna, and the following shot ran. After 15 we again ran ECDC, with no RF conditioning, and again got a plasma on 16. However, after shot 16, Chris observed a piece of shim stock lying in the divertor between B and C ports. This has been tentatively identified as the VB viewing dump. The run was stopped and cooling turned off in preparation for an up-to-helium tomorrow to remove it. All in all, NOT a good day! |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:13:083PM |
| Author: To Be Determined |
| Physics operator summary for run 1010530 (Wednesday): Plasma conditioning, DNB conditioning MP 214: D & E antenna conditioning MP 287: ASDEX non-dimensional comparison (possible piggyback) Session leader: Wolfe/Wukitch/Hubbard Physics operator: R. Granetz Engineer: G. Dekow/B. Cochran Summary: Lots of problems today. On shot 1 we found that the magnetics system was not working. This was traced to a failed power supply to the integrator circuits. (More info in logbook under MHD.) It took until noontime to replace the supply and confirm that everything was working properly. Throughout the rest of the day, we were plagued by inexplicable duds. The RF and the DNB were firing between shots, and we suspect (for no justifiable reason other than statistics) that conditioning J-port between shots somehow causes duds. Two times we did ECDC between shots, instead of RF conditioning, and both of the following shots had plasma. The H/D ratio was varying between 0.3 and 0.6 today. In the afternoon, we started matching triangularities to ASDEX, for MP 287, and we could probably do even better with a few more shots. The run ended prematurely when Chris Boswell observed a sheet (of metal?) standing in the divertor after shot 16. Scorecard: 5 plasmas 0 fizzles 9 duds 2 tests 0 aborted and/or screwed up by computer problems ---------- 16 total ------------------------------------------------------------------------------- Engineering setup: ECDC in D2 overnight prior to run. Be prepared for ECDC in D2 between shots (using B-top valve). Power systems as on 1010525021. Gas setup: fill B-top with 6 psi of D2 Hybrid enabled (PG4) fill B-side lower with 1 psi of Ar Hybrid enabled (PG1) fill B-side upper with 6 psi of He Hybrid enabled (PG2) fill C-side with 30 psi of D2 Hybrid enabled (PG3) fill J-bottom with nothing Hybrid DISABLED (PG5) Enable the following gate valves: ECE, DNB. Do NOT enable VUV ! Run starts at 09:00 and ends at 17:00. ------------------------------------------------------------------------------- RF Setup: Transmitters 1, 2, 3, and 4 should be warmed up by 07:30. ------------------------------------------------------------------------------- Run Plan: Plasma conditioning, DNB conditioning MP 214: D & E antenna conditioning MP 287: ASDEX non-dimensional comparison (possible piggyback) Start from most recent shot (1010525021), except re-program Ip to be flat. The density will be raised during the morning to try and reduce the H/D ratio, in preparation for next week's boronization. Helium will be puffed for DNB/CXRS. RF will start off with D and E antennas, with the possibility of also turning on J. If we get around to MP 287, Amanda will specify the desired shapes, which mostly involve reducing the triangularity. ------------------------------------------------------------------------------- Overnight ECDC in D2 was done. Hybrid coldstart done; no errors found ------------------------------------------------------------------------------- Shot 01 -- Dud. OH2's went beserk because the magnetics didn't work correctly. The +/-15 volt supply for the integrators (and the +5 volt TTL invertors for the TR16's) is blown. The wiring harness to one of the integrator circuit racks is burned up. We don't think the circuits themselves have any problems. There will be a delay of several hours while a new power supply and wiring is prepared and reinstalled. Then we will run some magnetics tests and a "Tuesday morning" test of the OH's to confirm that they're okay and that the magnetics system is working properly. Shot 02 -- Test; OH1, OH2's under PLC control. Looks good. Magnetics system is working properly. Next shot: go for plasma Shot 03 -- Dud. All power supplies look good. Fields and pressure look good. Next shot: add +10 amps to IC_EF4 and 3 ms to pre-fill puff Shot 04 -- Test, no power; (because the EF breaker faulted during INIT) Next shot: try for plasma again. Shot 05 -- Dud. Fields and pressure looks good. Next shot: increase pre-fill puff another 5 ms, on Steve Wolfe's request. Shot 06 -- Dud. Fields look good. Fill pressure is on the high side. Next shot: try going the other way in pre-fill pressure. Set it at 18 ms. (It was at 30 ms for this last shot.) Shot 07 -- Plasma. Full length shot; ramped all the way down. Ip=0.8 MA, nice flattop. nl_04=0.7e20 m-2. Prf=0.5 MW from each of D and E. Some hints of heating. H/D=0.35. Next shot: raise nl_04 to 1.0e20 m-2. Shot 08 -- Plasma. Disrupted in rampdown. Prf=1.0 MW from D+E. Density was at nl_04=1.0e20 m-2 for most of the shot, but then rose a little late in the shot. H/D ramps from 0.3 to 0.6 during the shot. Next shot: increase argon puff from 25 to 35 ms. Note: RF and DNB have been firing between shots since the beginning of the run. Shot 09 -- Plasma. Disrupted at t=0.49 s. Looks like it was getting a little resistive, or maybe a little injection. Next shot: slow down the density ramp a bit. Shot 10 -- Dud. Fields look good. Pre-fill has gone up a bit. Next shot: decrease pre-fill another 2 ms. Also decrease upper and lower triangularities by moving RXL and RXU out by 1.0 and 1.5 cm respectively. Amanda wants us to shoot for DOUTU=0.316 and DOUTL=0.431 Shot 11 -- Dud. Next shot: put the pre-fill puff back to 18 ms Shot 12 -- Dud. Everything looks fine. Start ECDC in D2 between shots. Next shot: no changes. Shot 13 -- Plasma. Disrupted during rampdown. No DNB. Prf=0.5 MW from E. DOUTU=0.31-0.32, DOUTL=0.43-0.44, Kappa=1.62. Next shot: add 3 mm to RXL, add ramp to RXU after t=1.0 s to try and keep upper triangularity constant. No between-shot ECDC this time, so RF can continue conditioning. Shot 14 -- Dud. Next shot: no changes. No between-shot ECDC. Shot 15 -- Dud. We're beginning to think that between-shot conditioning of the J-port antenna is somehow causing these duds. ECDC between shots. No RF conditioning between shots. Next shot: reduce ZXU by about 1.5 cm to try and increase the elongation for a better match to the ASDEX shape. Shot 16 -- Plasma. Disrupted at t=1.12 s. I think there was an injection at t=1.06 s. Prf=1 MW from D+E. Elongation didn't increase much, but upper triangularity did. ** Chris Boswell has video images showing a sheet of something sitting in the divertor between B and C ports. ** End of run. Tomorrow we'll have to backfill the machine with helium, open up the gate valve at C-port, reach in and extract the object. |
| Session Leader Comments | |||
| May 30 2001 10:20:16:327AM | 1010530001 | Steve Wolfe | shot#1: Plasma attempt. Dud. Oh2 supplies went berserk. Hybrid Br and ZCUR feedback thrashing rail-to-rail Magnetics problem. The DC supply to the integrator crates is dead. Note that this supply also runs the inverter that supplies triggers to the TR16's, so they didn't go. Delay until a new DC supply is wired up and installed. Then we'll proceed carefully to make sure nothing else is gronked. |
| May 30 2001 11:45:00:850AM | 1010530002 | Steve Wolfe | shot#2:OH's under PLC control signals look ok, oh2L resistance is back to 2.5uOhm. Next shot: try for plasma |
| May 30 2001 12:03:17:480PM | 1010530003 | Steve Wolfe | shot#3: try for plasma dud. Fields look ok, p0=.07mTorr. Should have gone? Coax at 1.8 Next shot; raise fill, 10A more positive on EF4 |
| May 30 2001 12:18:17:560PM | 1010530004 | Steve Wolfe | shot#4: raise fill, 10A more positive on EF4 No power shot - breaker pulled. |
| May 30 2001 12:38:00:610PM | 1010530005 | Steve Wolfe | shot#5: raise fill, 10A more positive on EF4 another dud. raise fill again |
| May 30 2001 12:44:28:347PM | 1010530006 | Steve Wolfe | shot#6: raise pre-puff to 30msec another dud. Bob wants to lower the fill. I think we may be getting poisoned by RF and/or DNB going between shots. Earl remembers when this happened last year; he also remembers getting plasma back by lowering the fill, so we'll see. |
| May 30 2001 01:08:11:070PM | 1010530007 | Steve Wolfe | shot#7: Prepuff to 18msec plasma full length! RF from D&E at 0.5MW each. H/D ~.35 next shot: Raise nl4 to 1e20 |
| May 30 2001 01:31:15:693PM | 1010530008 | Steve Wolfe | shot#8: Raise nl4 to 1e20 plasma to 1.65sec; EF1U is maxed out at +5000A EFIT bombed at the disruption, re-running it. pressure rise at 1.1sec may be the beam? RF on 0.6:1.5 at 1MW total next shot: raise Ar for JR |
| May 30 2001 01:46:46:313PM | 1010530009 | Steve Wolfe | shot#9: raise Ar for JR, otherwise the same early disruption 0.5sec; may have marfed during crossover. PF breaker pulled, oh1 crowbarred after the disruption next shot: delay the density rise a little. |
| May 30 2001 02:05:53:253PM | 1010530010 | Steve Wolfe | shot#10: delay the density rise a little. dud. |
| May 30 2001 02:22:58:800PM | 1010530011 | Steve Wolfe | shot#11: drop the fill? Bob wants to. Also, begin lowering the triangularity for the ASDEX sim. another dud. Raise the fill. |
| May 30 2001 02:38:53:610PM | 1010530012 | Steve Wolfe | shot#12: Raise the fill back to where it was on shot 9 (and 10). Still trying fo rlower triangularity, slower density rise. And another dud. Go to ECDC before the next shot. |
| May 30 2001 03:11:47:010PM | 1010530013 | Steve Wolfe | shot#13: Try ten minutes of between-shot ECDC, no RF conditioning pulses this time. Still trying fo rlower triangularity, slower density rise. plasma, 1.62sec; density still rises at 1.1sec but the beam was off, so it's not them D faulted, E stayed on. lower tri=.44 upper tri=0.32 before 1sec, rising to .36 kappa=1.62. The target was .43, .31, 1.64, but ASDEX was closer to being double null. |
| May 30 2001 03:32:16:783PM | 1010530014 | Steve Wolfe | shot#14: add 3mm to rxl, and increase rxu after 1 sec. and another dud. I think it's the RF conditioning, but they need to do it. NO ECDC this time. |
| May 30 2001 03:43:18:547PM | 1010530015 | Steve Wolfe | shot#15: add 3mm to rxl, and increase rxu after 1 sec (relative to 13) dud |
| May 30 2001 03:52:41:603PM | 1010530015 | Steve Wolfe | shot#15: add 3mm to rxl, and increase rxu after 1 sec (relative to 13) dud Back to ECDC between shots, RF will stop pulsing between shots. See if this works. |
| May 30 2001 04:30:05:517PM | 1010530016 | Steve Wolfe | shot#16: add 3mm to rxl, and increase rxu after 1 sec (relative to 13) zxu to +.03, to try to match ASDEX shape better. plasma, disrupts at 1.1sec. RF at 1MW. du=.37, dl=.43, kappa=1.63, ssep=-1.2cm There is a piece of metal, like shim stock, in the divertor between B and C port. It could be a viewing dump from the Z-meter. It seems to be there from the beginning of shot 16, but was not visible during shot 13. |
| Physics Operator Comments | |||
| May 29 2001 05:31:04:820PM | Robert Granetz | ------------------------------------------------------------------------------- Engineering setup: ECDC in D2 overnight prior to run. Be prepared for ECDC in D2 between shots (using B-top valve). Power systems as on 1010525021. Gas setup: fill B-top with 6 psi of D2 Hybrid enabled (PG4) fill B-side lower with 1 psi of Ar Hybrid enabled (PG1) fill B-side upper with 6 psi of He Hybrid enabled (PG2) fill C-side with 30 psi of D2 Hybrid enabled (PG3) fill J-bottom with nothing Hybrid DISABLED (PG5) Enable the following gate valves: ECE, DNB. Do NOT enable VUV ! Run starts at 09:00 and ends at 17:00. ------------------------------------------------------------------------------- RF Setup: Transmitters 1, 2, 3, and 4 should be warmed up by 07:30. ------------------------------------------------------------------------------- Run Plan: Plasma conditioning, DNB conditioning MP 214: D & E antenna conditioning MP 287: ASDEX non-dimensional comparison (possible piggyback) Start from most recent shot (1010525021), except re-program Ip to be flat. The density will be raised during the morning to try and reduce the H/D ratio, in preparation for next week's boronization. Helium will be puffed for DNB/CXRS. RF will start off with D and E antennas, with the possibility of also turning on J. If we get around to MP 287, Amanda will specify the desired shapes, which mostly involve reducing the triangularity. ------------------------------------------------------------------------------- | |
| May 30 2001 09:02:42:870AM | Robert Granetz | ------------------------------------------------------------------------------- Overnight ECDC in D2 was done. Hybrid coldstart done; no errors found ------------------------------------------------------------------------------- | |
| May 30 2001 10:34:45:977AM | 1010530001 | Robert Granetz | Shot 01 -- Dud. OH2's went beserk because the magnetics didn't work correctly. The +/-15 volt supply for the integrators (and the +5 volt TTL invertors for the TR16's) is blown. The wiring harness to one of the integrator circuit racks is burned up. We don't think the circuits themselves have any problems. There will be a delay of several hours while a new power supply and wiring is prepared and reinstalled. Then we will run some magnetics tests and a "Tuesday morning" test of the OH's to confirm that they're okay and that the magnetics system is working properly. |
| May 30 2001 11:45:23:900AM | 1010530002 | Robert Granetz | Shot 02 -- Test; OH1, OH2's under PLC control. Looks good. Magnetics system is working properly. Next shot: go for plasma |
| May 30 2001 12:00:43:893PM | 1010530003 | Robert Granetz | Shot 03 -- Dud. All power supplies look good. Fields and pressure look good. Next shot: add +10 amps to IC_EF4 and 3 ms to pre-fill puff |
| May 30 2001 12:19:45:687PM | 1010530004 | Robert Granetz | Shot 04 -- Test, no power; (because the EF breaker faulted during INIT) Next shot: try for plasma again. |
| May 30 2001 12:27:34:710PM | 1010530005 | Robert Granetz | Shot 05 -- Dud. Fields and pressure looks good. Next shot: increase pre-fill puff another 5 ms, on Steve Wolfe's request. |
| May 30 2001 12:43:49:393PM | 1010530006 | Robert Granetz | Shot 06 -- Dud. Fields look good. Fill pressure is on the high side. Next shot: try going the other way in pre-fill pressure. Set it at 18 ms. (It was at 30 ms for this last shot.) |
| May 30 2001 01:09:53:963PM | 1010530007 | Robert Granetz | Shot 07 -- Plasma. Full length shot; ramped all the way down. Ip=0.8 MA, nice flattop. nl_04=0.7e20 m-2. Prf=0.5 MW from each of D and E. Some hints of heating. H/D=0.35. Next shot: raise nl_04 to 1.0e20 m-2. |
| May 30 2001 01:31:43:693PM | 1010530008 | Robert Granetz | Shot 08 -- Plasma. Disrupted in rampdown. Prf=1.0 MW from D+E. Density was at nl_04=1.0e20 m-2 for most of the shot, but then rose a little late in the shot. H/D ramps from 0.3 to 0.6 during the shot. Next shot: increase argon puff from 25 to 35 ms. Note: RF and DNB have been firing between shots since the beginning of the run. |
| May 30 2001 01:51:28:043PM | 1010530009 | Robert Granetz | Shot 09 -- Plasma. Disrupted at t=0.49 s. Looks like it was getting a little resistive, or maybe a little injection. Next shot: slow down the density ramp a bit. |
| May 30 2001 02:13:08:240PM | 1010530010 | Robert Granetz | Shot 10 -- Dud. Fields look good. Pre-fill has gone up a bit. Next shot: decrease pre-fill another 2 ms. Also decrease upper and lower triangularities by moving RXL and RXU out by 1.0 and 1.5 cm respectively. Amanda wants us to shoot for DOUTU=0.316 and DOUTL=0.431 |
| May 30 2001 02:24:13:943PM | 1010530011 | Robert Granetz | Shot 11 -- Dud. Next shot: put the pre-fill puff back to 18 ms |
| May 30 2001 02:40:54:863PM | 1010530012 | Robert Granetz | Shot 12 -- Dud. Everything looks fine. Start ECDC in D2 between shots. Next shot: no changes. |
| May 30 2001 03:19:07:153PM | 1010530013 | Robert Granetz | Shot 13 -- Plasma. Disrupted during rampdown. No DNB. Prf=0.5 MW from E. DOUTU=0.31-0.32, DOUTL=0.43-0.44, Kappa=1.62. Next shot: add 3 mm to RXL, add ramp to RXU after t=1.0 s to try and keep upper triangularity constant. No between-shot ECDC this time, so RF can continue conditioning. |
| May 30 2001 03:34:09:773PM | 1010530014 | Robert Granetz | Shot 14 -- Dud. Next shot: no changes. No between-shot ECDC. |
| May 30 2001 03:57:21:490PM | 1010530015 | Robert Granetz | Shot 15 -- Dud. We're beginning to think that between-shot conditioning of the J-port antenna is somehow causing these duds. ECDC between shots. No RF conditioning between shots. Next shot: reduce ZXU by about 1.5 cm to try and increase the elongation for a better match to the ASDEX shape. |
| May 30 2001 04:53:44:830PM | 1010530016 | Robert Granetz | Shot 16 -- Plasma. Disrupted at t=1.12 s. I think there was an injection at t=1.06 s. Prf=1 MW from D+E. Elongation didn't increase much, but upper triangularity did. ** Chris Boswell has video images showing a sheet of something sitting in the divertor between B and C ports. ** End of run. Tomorrow we'll have to backfill the machine with helium, open up the gate valve at C-port, reach in and extract the object. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:06:49:497AM | Plasma | Bad | OH2U/L seem to have a wild oscillation at beginning of the pulse. |
| 2 | 11:35:27:547AM | Test | Ok | OH Test Shot Only, PLC, 10Kamps |
| 3 | 11:51:12:337AM | Plasma | Ok | |
| 4 | 12:04:53:780PM | Plasma | Bad | OH2L flt during Init |
| 5 | 12:20:43:753PM | Plasma | Ok | No power supply faults |
| 6 | 12:38:02:563PM | Plasma | Ok | |
| 7 | 12:57:07:633PM | Plasma | Ok | |
| 8 | 01:19:04:253PM | Plasma | Ok | |
| 9 | 01:40:11:230PM | Plasma | Bad | OH1 self power circuit fired (type 1 fault). |
| 10 | 02:00:28:380PM | Plasma | Ok | |
| 11 | 02:19:41:743PM | Plasma | Ok | |
| 12 | 02:35:21:960PM | Plasma | Ok | |
| 13 | 02:59:44:197PM | Plasma | Ok | |
| 14 | 03:22:21:490PM | Plasma | Ok | |
| 15 | 03:39:55:583PM | Plasma | Ok | |
| 16 | 04:06:25:500PM | Plasma | Ok | |