| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Steve Wukitch |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Sam Pierson,Bill Byford,Ed Fitzgerald |
| Engineering Operator Run Comment |
| MP#326 EO Pierson SL Wukitch PO Granetz |
| Session Leader Plans |
| Entered: Mar 17 2005 09:39:48:990PM |
| Author: Steve Wukitch |
| Plan:
We will start with vanilla discharges to compare the heating effectiveness (different from heating efficiency) of the 3 antennas. This means separate antenna pulses within each discharge 0.5, 1.0, 1.5 MW. Then combine D and E and increase the total power to 2 MW and 2.5 MW. We will then investigate operation at higher neutral pressure by scanning to higher density. We will return to more standard density and compare H-mode thresholds via power ramps and scan current to compare impurity and density production. We may need one discharge to calibrate the bolometers via impurity puffing depending on diagnostic requirements. --------------------------------------------------------- |
| Physics Operators Plans |
| Entered: Mar 17 2005 06:30:24:443PM |
| Author: Robert Granetz |
| Engineering setup for Friday, 18 Mar 2005 MP #326 -- D, E, and J-port Antenna Evaluation and Comparison Session leader: S. Wukitch Physics operator: R. Granetz Overnight ECDC in D2, bake at 60 C. Run begins at 09:00 and ends at 17:00. Power systems as on 1050316018. A-coils in standard configuration (lock mode suppression): +Dtop -Dbot -Jtop +Jbot (same as 1050316) Gas Setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 2 psi Ar Hybrid enabled (PG1) leave B-side upper with He3 Hybrid disabled fill B-main (C-side) with 30 psi D2 Hybrid enabled (PG3) leave J-bot Hybrid disabled (PG2) fill NINJA with 10 psi D2 Leave disabled to begin with Torvac setup: GV1 closed; bypass to RGA open Torus gate valves to REMAIN OPEN during and after shot. Enable the following gate valves, assuming no vacuum problems: ECE, Z-bolo shutters. Necessary diagnostics: Standard, including bolometry, video cameras. ------------------------------------------------------------------------------- ICRF Setup: All transmitters in run on at 08:30. ------------------------------------------------------------------------------- Run plan: The goal of this run is to retry this past Wednesday's run (1050316), which was unsuccessful because of problems with the EF3 breaker and with RF pickup noise throughout the cell. These problems have been fixed Start with 1050316018 (vanilla shot with 0.8 MA, 5.4 T, and target nl_04=1.0e20 m-2). Compare heating efficiencies of the three antennas. We will then investigate operation at higher neutral pressure by scanning to higher density. We will return to more standard density and compare H-mode thresholds via power ramps and scan current to compare impurity and density production. |
| Session Leader Summaries |
| Entered: Mar 21 2005 11:43:03:653AM |
| Author: Steve Wukitch |
| Run summary The antenna heating effectiveness appears about the same for all antennas within 10%. One could argue that J antenna is slightly less effective than D and E and D may be slightly better than E. From a few discharges, the heating efficiency was measured from change in slope in stored energy and the range of efficiencies is from 0.5-0.7. The J antenna neutral pressure limit appears unchanged from last campaign (~0.25 mTorr) at 0.8 MA and increased to between 0.7-1 mtorr at 1 MA. This suggests to condition the antenna after boronization we should increase the plasma current. |
| Physics Operator Summaries |
| Entered: Mar 18 2005 05:34:41:743PM |
| Author: Robert Granetz |
| From the physop standpoint, the run when very well today. We had 35 shot cycles, of which only one was a fizzle, and another one was a no-power shot due to a computer hang. D, E, and J antennas were all run today at powers up to 2.5 MW. The antennas all seemed to be heating equally well. Despite the high RF power, we had only marginal, dithering H-modes. Late in the run we tried to do the bolometry calibration by causing impurity disruptions with argon puffing. This was sort of successful, except that we couldn't stretch out the timescale as much as we would have liked, despite trying various valve waveforms and plenum pressures. Scorecard: 33 plasmas 1 fizzles 0 duds 1 tests or no-power shot cycles 0 beam-into-gas calibration shots with B-field(s) ---------- 35 total shot cycles |
| Session Leader Comments | |||
| Mar 18 2005 09:38:15:153AM | 1050318001 | Steve Wukitch | 001 5.4 T, Ip=0.8 MA, nl_04->0.8 D: 0.5 MW [0.6,0.9]sec E: 0.5 MW [0.9,1.2]sec J: 0.5 MW [1.2,1.5]sec result: plasma D: ran 1 fault E: ran J: ran 1 fault next shot: raise power to 1 MW |
| Mar 18 2005 09:38:57:530AM | 1050318002 | Steve Wukitch | 002 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.0 MW [0.6,0.9]sec E: 1.0 MW [0.9,1.2]sec J: 1.0 MW [1.2,1.5]sec result: plasma D: ran E: ran J: ran 3 faults next shot: repeat cell data is lost |
| Mar 18 2005 10:14:18:903AM | 1050318003 | Steve Wukitch | 003 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.0 MW [0.6,0.8]sec E: 1.0 MW [0.9,1.1]sec J: 1.0 MW [1.2,1.4]sec result: plasma D: ran E: ran J: ran 1 fault cell data is lost next shot: raise power |
| Mar 18 2005 10:15:00:903AM | 1050318004 | Steve Wukitch | 004 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.4 MW [0.55,0.85]sec E: 1.4 MW [0.9,1.15]sec J: 1.5 MW [1.2,1.5]sec result: plasma D: ran E: ran J: ran 7 faults cell data is lost no spectroscopy data next shot: repeat |
| Mar 18 2005 10:31:23:700AM | 1050318005 | Steve Wukitch | 005 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.4 MW [0.55,0.85]sec E: 1.4 MW [0.9,1.15]sec J: 1.5 MW [1.2,1.5]sec result: plasma D: ran E: ran J: ran 1 fault cell data is lost next shot: swap pulse order |
| Mar 18 2005 11:09:57:620AM | 1050318006 | Steve Wukitch | 006 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.4 MW [0.9,1.15]sec E: 1.4 MW [0.55,0.85]sec J: 1.5 MW [1.2,1.5]sec result: plasma D: ran E: ran J: ran 4 faults cell data is lost next shot: move J to beginning |
| Mar 18 2005 11:10:44:607AM | 1050318007 | Steve Wukitch | 007 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.4 MW [0.9,1.15]sec E: 1.4 MW [0.55,0.85]sec J: 1.5 MW [1.2,1.5]sec result: plasma D: ran E: ran J: ran cell data is lost next shot: repeat |
| Mar 18 2005 11:21:21:530AM | 1050318008 | Steve Wukitch | 008 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.4 MW [0.9,1.15]sec E: 1.4 MW [0.55,0.85]sec J: 1.5 MW [1.2,1.5]sec result: plasma D: ran E: ran J: ran cell data is present - changed decoder channel, power cycled CAMAC and cPCI next shot: overlap D and E |
| Mar 18 2005 11:56:33:167AM | 1050318009 | Steve Wukitch | 009 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.0 MW [1.1,1.5]sec E: 1.0 MW [1.1,1.5]sec J: 2 MW [0.55,1.05]sec result: plasma - H-mode D: ran E: ran J: ran 5 faults next shot: repeat |
| Mar 18 2005 11:56:07:450AM | 1050318010 | Steve Wukitch | 010 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.0 MW [1.1,1.5]sec E: 1.0 MW [1.1,1.5]sec J: 2.0 MW [0.55,1.05]sec result: plasma D: ran E: ran J: ran 9 faults cameras are back next shot: repeat |
| Mar 18 2005 11:55:13:167AM | 1050318011 | Steve Wukitch | 011 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.0 MW [1.1,1.5]sec E: 1.0 MW [1.1,1.5]sec J: 2 MW [0.55,1.05]sec result: plasma D: ran E: ran J: ran 6 faults next shot: repeat |
| Mar 18 2005 12:17:38:337PM | 1050318012 | Steve Wukitch | 012 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.4 MW [1.1,1.5]sec E: 1.4 MW [1.1,1.5]sec J: 1.5 MW [0.55,1.05]sec result: plasma D: ran E: ran J: ran 2 faults next shot: move up in power |
| Mar 18 2005 12:20:29:087PM | 1050318013 | Steve Wukitch | 013 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.25 MW [1.1,1.5]sec E: 1.25 MW [1.1,1.5]sec J: 2.5 MW [0.55,1.05]sec result: plasma D: ran 3 faults E: ran 1 fault J: ran 8 faults next shot: repeat |
| Mar 18 2005 12:45:18:057PM | 1050318014 | Steve Wukitch | 014 NTP |
| Mar 18 2005 12:56:03:587PM | 1050318015 | Steve Wukitch | 015 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.2 MW [1.1,1.5]sec E: 1.1 MW [1.1,1.5]sec J: 2.5 MW [0.55,1.05]sec result: plasma D: ran E: ran J: ran 9 faults next shot: repeat |
| Mar 18 2005 01:08:09:413PM | 1050318016 | Steve Wukitch | 016 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.2 MW [1.1,1.5]sec E: 1.1 MW [1.1,1.5]sec J: 2.5 MW [0.55,1.05]sec result: plasma D: ran 2 faults E: ran 1 fault J: ran max faults next shot: repeat |
| Mar 18 2005 01:28:53:460PM | 1050318017 | Steve Wukitch | 017 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.2 MW [1.1,1.5]sec E: 1.1 MW [1.1,1.5]sec J: 2.5 MW [0.55,1.05]sec result: plasma D: ran 2 faults E: ran 1 fault J: ran 2 faults next shot: repeat |
| Mar 18 2005 01:45:58:523PM | 1050318018 | Steve Wukitch | 018 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.2 MW [1.1,1.5]sec E: 1.1 MW [1.1,1.5]sec J: 2.5 MW [0.55,1.05]sec result: plasma D: ran 2 faults E: ran 1 fault J: ran max faults next shot: raise density, separate antennas - begin neutral pressure scan |
| Mar 18 2005 01:55:49:680PM | 1050318020 | Steve Wukitch | 020 5.2 T, Ip=0.8 MA, nl_04->1 D: 1.4 MW [0.9,1.15]sec E: 1.4 MW [0.55,0.85]sec J: 1.5 MW [1.2,1.5]sec result: plasma D: ran 1 fault E: ran clean J: ran 4 faults next shot: swap antenna order and raise density |
| Mar 18 2005 02:13:04:697PM | 1050318021 | Steve Wukitch | 021 5.2 T, Ip=0.8 MA, nl_04->1.2 D: 1.4 MW [0.55,0.85]sec E: 1.4 MW [0.9,1.15]sec J: 1.5 MW [1.2,1.5]sec result: plasma D: ran 1 fault E: ran clean J: ran max faults - all J4 next shot: repeat |
| Mar 18 2005 02:26:55:023PM | 1050318022 | Steve Wukitch | 022 5.2 T, Ip=0.8 MA, nl_04->1.2 D: 1.4 MW [0.55,0.85]sec E: 1.4 MW [0.9,1.15]sec J: 1.5 MW [1.2,1.5]sec result: plasma D: ran 1 fault E: ran clean J: ran max faults - all J4 next shot: turn off D and E and run long pulse with J |
| Mar 18 2005 02:46:37:867PM | 1050318023 | Steve Wukitch | 023 5.2 T, Ip=0.8 MA, nl_04->1.2 J: 1.5 MW [.6,1.5]sec result: plasma J: ran max faults next shot: retune and hope for the best |
| Mar 18 2005 03:00:19:600PM | 1050318024 | Steve Wukitch | 024 5.2 T, Ip=0.8 MA, nl_04->1.2 J: 1.5 MW [.6,1.5]sec result: plasma J: ran max faults next shot: raise current to 1 MA |
| Mar 18 2005 03:07:10:103PM | 1050318025 | Steve Wukitch | 025 5.2 T, Ip=0.8 MA, nl_04->1.2 J: 1.5 MW [.6,1.5]sec result: plasma J: ran max faults next shot: repeat with better match |
| Mar 18 2005 04:04:38:383PM | 1050318026 | Steve Wukitch | 026 5.2 T, Ip=1 MA, nl_04->1.2 J: 1.5 MW [.6,1.5]sec result: plasma J: ran next shot: raise density to 1.5 |
| Mar 18 2005 04:04:20:710PM | 1050318027 | Steve Wukitch | 027 5.2 T, Ip=1 MA, nl_04->1.2 J: 1.5 MW [.6,1.5]sec result: plasma J: ran next shot: raise density to 1.5 |
| Mar 18 2005 03:42:32:883PM | 1050318028 | Steve Wukitch | 028 NTP |
| Mar 18 2005 04:03:15:023PM | 1050318029 | Steve Wukitch | 029 5.2 T, Ip=1 MA, nl_04->1.2 J: 1.5 MW [.6,1.5]sec result: plasma J: ran max fault - still have neutral pressure limit but it is between 0.7 and 1 mtorr next shot: return to standard shot, with intentional RF trips at 0.8 and 1 sec |
| Mar 18 2005 04:07:15:413PM | 1050318030 | Steve Wukitch | 030 5.2 T, Ip=0.8 MA, nl_04->0.8 J: 1.5 MW [0.55,1.0]sec result: plasma J: ran 1 fault next: repeat without disruption |
| Mar 18 2005 04:25:52:633PM | 1050318031 | Steve Wukitch | 031 5.2 T, Ip=0.8 MA, nl_04->0.8 J: 1.5 MW [0.55,1.0]sec result: plasma J: ran. good DW/dT at the two shut-offs (0.8 and 1.0 sec) gave efficiency at 0.5 and 0.64, respectively |
| Mar 18 2005 04:53:59:807PM | 1050318032 | Steve Wukitch | 032 5.2 T, Ip=0.8 MA, nl_04->0.8 J: 1.5 MW [0.6,.9]sec result: plasma J: ran. good DW/dT at the two shut-offs (0.8 and .9 sec) gave efficiency at 0.6 and 0.4, respectively |
| Mar 18 2005 04:54:47:070PM | 1050318033 | Steve Wukitch | 033 5.2 T, Ip=0.8 MA, nl_04->0.8 D: 1.2 MW [0.6,.9]sec result: plasma D: ran. good DW/dT at the two shut-offs (0.8 and .9 sec) gave efficiency at 0.7 and 0.6, respectively |
| Mar 21 2005 09:23:05:950AM | 1050318034 | Steve Wukitch | 034 5.2 T, Ip=0.8 MA, nl_04->0.8 E: 1.2 MW [0.6,.9]sec result: plasma E: ran. good DW/dT at the two shut-offs (0.8 and .9 sec) gave efficiency at about 0.55 |
| Mar 21 2005 09:22:55:513AM | 1050318035 | Steve Wukitch | 035 5.2 T, Ip=0.8 MA, nl_04->0.8 E: 1.2 MW [0.6,.9]sec result: plasma E: ran. good DW/dT at the two shut-offs (0.8 and .9 sec) gave efficiency at about 0.5 |
| Physics Operator Comments | |||
| Mar 18 2005 09:27:14:450AM | 1050318001 | Robert Granetz | Plasma. Good standard shot, but really ratty startup. Lots of runaways until they suddenly all went away at 0.24 s, possibly due to an injection at that time. The rest of the shot looked okay. Video cameras had a problem with data acquisition. All three antennas were on (not simultaneously) at about a half-MW each. Next shot: adjust RCUR offset in segment 1 (1500 -> 2000). Also reduce Btor from 5.4 to 5.2 T (144 kA). |
| Mar 18 2005 09:44:59:857AM | 1050318002 | Robert Granetz | Plasma. Good shot. Good startup. Btor=5.2 T, as requested. Ip=0.8 MA, nl_04=0.9e20 m-2. All three antennas fired individually. Problem with the RF data. Next shot: repeat, no changes. |
| Mar 18 2005 10:00:55:573AM | 1050318003 | Robert Granetz | Plasma. Good shot. Good startup, but there are lots of runaways. Got some RF data this time...about 1 MW in each antenna. Next shot: increase early density pre-programmed gas. Also fill NINJA plenum with 5 psi of helium-4. |
| Mar 18 2005 10:21:44:763AM | 1050318004 | Robert Granetz | Plasma. Good shot. Great startup. Much fewer hard x-rays. All antennas fired, but there are still data acquisition problems. 1.5 MW from each antenna. Amanda reports that early Te(r) profiles are back to their normal, peaked shape. (Yesterday they were strongly hollow.) Next shot: no changes |
| Mar 18 2005 10:30:34:920AM | 1050318005 | Robert Granetz | Plasma. Good shot. All antennas fired, but there are still data acquisition problems. 1.5 MW from each antenna. Heating effectiveness seems to drop with time during the shot, or with D -> E -> J sequency. Next shot: no changes, except change the order of antenna firing |
| Mar 18 2005 10:45:22:373AM | 1050318006 | Robert Granetz | Plasma. Good shot. All antennas fired at 1.55-1.8 MW, but J-port had numerous trips. Sequence was E -> D -> J Next shot: tweak up the early pre-programmed gas puff some more |
| Mar 18 2005 10:53:47:543AM | 1050318007 | Robert Granetz | Plasma. Good shot. All antennas fired at 1.5-1.8 MW. Sequence was J -> E -> D. Good equal heating by all antennas, but still no H-modes. H/(H+D) is remaining down at 5-6%. Zeff is 1.4-1.5. Next shot: no PCS changes. D and E will be overlapped. |
| Mar 18 2005 11:20:02:543AM | 1050318008 | Robert Granetz | Plasma. Good shot. All antennas fired at 1.5-1.7 MW. Sequence was J -> E -> D. D and E were NOT overlapped. Approximately equal heating by all antennas, but still no H-modes. H/(H+D) is remaining down at 5-6%. Zeff is 1.4-1.5. Next shot: no PCS changes. D and E will be overlapped. |
| Mar 18 2005 11:30:03:513AM | 1050318009 | Robert Granetz | Plasma. Good shot. D and E were overlapped, giving 2.2 MW total, and an EDA H-mode (finally). J-port fired first, but had some faulting problems early on and then settled down to 1.9 MW. H/(H+D) is remaining down at 5%. Zeff is 1.2-1.3. Next shot: no PCS changes. Repeat to get better J-port performance. |
| Mar 18 2005 12:41:27:760PM | 1050318009 | Robert Granetz | Earl points out that this was not an EDA H-mode, but rather a dithery, barely H-mode plasma. (Type III ELM's ?) |
| Mar 18 2005 11:46:47:227AM | 1050318010 | Robert Granetz | Plasma. Good shot. D and E were overlapped, giving 2.2 MW total, and an EDA H-mode. J-port fired first, but had faulting problems. H/(H+D) is remaining down at 6%. Next shot: no PCS changes. Repeat to get better J-port performance. |
| Mar 18 2005 11:59:27:980AM | 1050318011 | Robert Granetz | Plasma. Good shot. D and E were overlapped, giving 2.2 MW total, and an EDA H-mode. J-port fired first, got 2.0 MW with a few faults. J-port also produced a few short L-H transitions. H/(H+D) is remaining down at 6%. Zeff=1.3-1.5 Next shot: no PCS changes. |
| Mar 18 2005 12:11:02:197PM | 1050318012 | Robert Granetz | Plasma. Good shot. D and E were overlapped, giving 2.2 MW total, and an EDA H-mode. J-port fired first, got 2.0 MW with only a couple of faults. J-port also produced a short L-H transition. H/(H+D) is remaining down at 6%. Zeff=1.5 Next shot: no PCS changes. Raise J-port to 2.5 MW |
| Mar 18 2005 12:23:44:960PM | 1050318013 | Robert Granetz | Plasma. Good shot. RF power was raised. J=2.4, D+E=2.8 MW, but lots of faulting. H/(H+D) gets up to 8-9%. Next shot: tweak up early pre-programmed gas some more. |
| Mar 18 2005 12:34:57:197PM | 1050318014 | Robert Granetz | No power shot due to computer problems in init. |
| Mar 18 2005 01:00:28:773PM | 1050318015 | Robert Granetz | Plasma. Good shot. J=2.5 MW with lots of faulting, D+E=2.5 MW. H/(H+D)=6-8%. Next shot: no PCS changes. |
| Mar 18 2005 01:08:02:103PM | 1050318015 | Robert Granetz | Plasma. Good shot. J didn't stay on. D+E=2.5 MW. H/(H+D)=6-7%. Next shot: more early pre-programmed gas puffing. |
| Mar 18 2005 01:24:22:883PM | 1050318015 | Robert Granetz | Plasma. Good shot. J=2.4 MW, D+E=2.5 MW. H/(H+D)=7-9%. Next shot: one more repeat, then we'll start a density scan. |
| Mar 18 2005 01:35:00:040PM | 1050318015 | Robert Granetz | Plasma. Good shot. J=2.4 MW, D+E=2.4 MW. Short dithery H-modes. H/(H+D)=6-8%. Zeff=1.6 Next shot: Start a density scan. Increase nl_04 to 1.0e20 m-2 (from 0.8) |
| Mar 18 2005 01:48:54:400PM | 1050318015 | Robert Granetz | Plasma. Good shot. Got the requested density of nl_04=1.0e20 m-2. J=1.4 MW, E=1.4 MW, but D didn't stay on. No H-modes. H/(H+D)=6-7%. Zeff=1.6 Next shot: no PCS changes |
| Mar 18 2005 02:04:32:977PM | 1050318020 | Robert Granetz | Plasma. Good shot. About 1.5 MW from each antenna. Got a couple of dithery H-modes. H/(H+D)=5-7%. Zeff=1.3 Next shot: raise nl_04 to 1.2e20 m-2. |
| Mar 18 2005 02:10:11:743PM | 1050318021 | Robert Granetz | Plasma. Good shot, although it disrupted during rampdown. Antenna sequence was changed around: D -> E -> J. Prf=1.65 MW from each of D and E, but J failed to stay on. No H-modes. Next shot: no PCS changes. |
| Mar 18 2005 02:26:04:697PM | 1050318022 | Robert Granetz | Plasma. Good shot, although again it disrupted during rampdown. Prf=1.65 MW from each of D and E, but J failed to stay on again. No H-modes. H/(H+D)=4-5%. Zeff=1.2 Next shot: no PCS changes. |
| Mar 18 2005 02:36:40:523PM | 1050318023 | Robert Granetz | Plasma. Good shot, although again it disrupted during rampdown. Tried for J only this time, but it didn't do too well. Next shot: no PCS changes. |
| Mar 18 2005 02:57:38:540PM | 1050318024 | Robert Granetz | Plasma. Good shot, although again it disrupted during rampdown. Tried for J only this time, but it didn't do too well on this shot either. Next shot: raise Ip to 1.0 MA (from 0.8) |
| Mar 18 2005 03:11:47:290PM | 1050318025 | Robert Granetz | Plasma. Good shot, Got the 1.0 MA. There's a mysterious density increase from t=0.35 to 0.62 s due to a big marfe. J-port ran much better at this higher plasma current. Next shot: no PCS changes. |
| Mar 18 2005 03:18:50:460PM | 1050318026 | Robert Granetz | Plasma. Good shot, Same early marfe and density bump. J-port had 1.5 MW for 0.9 s. Next shot: raise nl_04 to 1.5e20 m-2 (from 1.2) |
| Mar 18 2005 03:32:07:510PM | 1050318027 | Robert Granetz | Plasma. Good shot, but disrupted early in rampdown at 0.8 MA. I_Halo_L=177 kA. Got the density, actually even a little more: nl_04=1.6e20 m-2. J-port is still looking very good, with 1.4 MW for 0.9 s. Next shot: raise nl_04 to 1.8e20 m-2 |
| Mar 18 2005 03:40:35:197PM | 1050318028 | Robert Granetz | Fizzle. Maybe it was the preceding rampdown disruption. Next shot: reduce pre-fill by 2 ms. |
| Mar 18 2005 04:02:12:447PM | 1050318029 | Robert Granetz | Plasma. Disrupted at t=1.47 s. Current was dropping before it was supposed to. J-port didn't stay on. Startup looked ratty. Next shot: return to conditions of shot 18 (0.8 MA, nl_04=0.8e20 m-2), but add a 100 ms argon puff starting at t=0.95 s. This is the start of our bolometry calibration portion of the run. |
| Mar 18 2005 04:11:19:413PM | 1050318030 | Robert Granetz | Plasma. Disrupted at t=0.94 s, just BEFORE the 2nd argon puff was supposed to begin. So I don't know what caused that disruption. We got the requested plasma current (0.8 MA) and density (nl_04=0.8e20 m-2). H/(H+D) is still down at 5%. J-port gave 1.5 MW. Next shot: increase pre-fill by 2 ms. |
| Mar 18 2005 04:25:36:977PM | 1050318031 | Robert Granetz | Plasma. Made it into rampdown. J-port had 1.5 MW until t=1.0 s, then it turned off quickly in order to get an absorption measurement from the EFIT diamagnetic signal. 2pi foil signal doesn't show any increase due to the 2nd argon puff. Next shot: raise argon plenum pressure to 10 psi (from 2 psi) and turn off the early puff (normally for JR). |
| Mar 18 2005 04:44:56:913PM | 1050318032 | Robert Granetz | Plasma. Disrupted at t=1.05 s, definitely due to the argon puff (as confirmed by John Rice). Interestingly, the argon takes 40+ ms to get in. Next shot: change argon puff to be 30 volts starting at t=0.95 s and going until t=1.5 s |
| Mar 18 2005 04:50:50:400PM | 1050318033 | Robert Granetz | Plasma. Best shot of the day. Unfortunately there wasn't any argon visible. John Rice tells us that we have to run that valve at 100 volts. Next shot: raise B-side-lower voltage to 100 V, from t=0.95 to 1.5 s, but reduce the plenum pressure to 5 psi. |
| Mar 18 2005 05:01:28:133PM | 1050318034 | Robert Granetz | Plasma. Disrupted at t=1.06 s definitely due to argon radiation. But it's still occurring too fast. Next shot: reduce argon plenum pressure to 3 psi. |
| Mar 18 2005 05:17:41:853PM | 1050318035 | Robert Granetz | Plasma. Disrupted at 1.10 s, again due to argon radiation (and maybe some non-linear MHD triggered by the argon). End of run |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:07:40:607AM | Plasma | Ok | |
| 2 | 09:28:43:060AM | Plasma | Ok | |
| 3 | 09:43:38:480AM | Plasma | Ok | |
| 4 | 10:01:48:620AM | Plasma | Ok | |
| 5 | 10:17:59:887AM | Plasma | Ok | |
| 6 | 10:30:55:107AM | Plasma | Ok | |
| 7 | 10:45:28:390AM | Plasma | Ok | |
| 8 | 11:07:32:107AM | Plasma | Ok | |
| 9 | 11:21:19:920AM | Plasma | Ok | |
| 10 | 11:35:58:043AM | Plasma | Ok | |
| 11 | 11:48:39:317AM | Plasma | Ok | |
| 12 | 12:01:44:477PM | Plasma | Ok | |
| 13 | 12:16:40:383PM | Plasma | Ok | |
| 14 | 12:29:12:570PM | Plasma | Bad | Computer problem |
| 15 | 12:46:25:587PM | Plasma | Ok | |
| 16 | 01:00:37:040PM | Plasma | Ok | |
| 17 | 01:12:57:460PM | Plasma | Ok | |
| 18 | 01:27:04:790PM | Plasma | Ok | |
| 19 | 01:39:32:150PM | Plasma | Ok | |
| 20 | 01:52:13:477PM | Plasma | Ok | |
| 21 | 02:04:56:930PM | Plasma | Ok | |
| 22 | 02:17:53:260PM | Plasma | Ok | |
| 23 | 02:31:09:087PM | Plasma | Ok | |
| 24 | 02:46:35:680PM | Plasma | Ok | |
| 25 | 02:59:23:367PM | Plasma | Ok | |
| 26 | 03:12:31:353PM | Plasma | Ok | |
| 27 | 03:25:02:430PM | Plasma | Ok | |
| 28 | 03:37:28:663PM | Plasma | Ok | |
| 29 | 03:49:53:913PM | Plasma | Ok | |
| 30 | 04:03:24:040PM | Plasma | Ok | |
| 31 | 04:15:50:477PM | Plasma | Ok | |
| 32 | 04:28:10:900PM | Plasma | Ok | |
| 33 | 04:43:55:290PM | Plasma | Ok | |
| 34 | 04:56:18:227PM | Plasma | Ok | |
| 35 | 05:08:50:307PM | Plasma | Ok | |