| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Kirill Zhurovich,Steve Wukitch |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Andy Pfeiffer,Ed Fitzgerald,Bill Byford |
| Engineering Operator Run Comment |
| MP#296: TS/ECE cross-calibration (1/2 day) MP#438: J-antenna evaluation |
| Session Leader Plans |
| Entered: Nov 16 2005 04:24:29:473PM |
| Author: Kirill Zhurovich |
| Run plan for 1051117a (same as for 1050620a):
MP #296 (revised) 'TS/ECE density calibration' Configure GPC2 for 4.6T operation No RF L-mode operation, avoid getting ohmic H-modes Basically repeat the run 1050620a, shots 02-15, but with higher field. Start with 1050620012, just change Bt to 4.6T. Magnetic field and gas puff will be optimized to get ECE cutoffs for all TS spatial channels. |
| Physics Operators Plans |
| Entered: Nov 16 2005 04:58:34:927PM |
| Author: Robert Granetz |
Engineering setup for Thursday 17 Nov 2005 MP#296: TS/ECE cross-calibration (1/2 day) MP#438: J-antenna evaluation (1/2 day) Session leader: T. Biewer (MP 296), S. Wukitch (MP 438) Physics operator: R. Granetz Overnight ECDC in D2 and bake at 60 C. Run begins at 09:00 and ends at 17:00. Power systems as on 1050620012, except the toroidal field will be raised to 4.6 T. A-coil configuration: normal [+Dtop -Dbot -Jtop +Jbot] and enabled. Gas Setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar + 2 psi Ne Hybrid DISABLED (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill NINJA with 10 psi D2 Leave DISABLED Enable the following gate valves and shutters, assuming no vacuum problems: ECE, VUV, Z-bolo shutters Torvac setup: Gate valves open No between-shot boronization. Important Diagnostics: TS, Edge TS, and GPC2 are required. GPC and FRCECE are desirable, if possible. GPC2 should be configured for Btor=4.6 T. ------------------------------------------------------------------------------- ICRF Setup: No RF for first half of the day. Transmitter 3 needs to be in run-on at 08:30. The others need to be able to be turned on remotely later in the day (go through checklist and set them up for remote control). ------------------------------------------------------------------------------- Run plan: See the SL_PLANs in the logbook. |
| Session Leader Summaries |
| Entered: Nov 21 2005 12:20:24:680PM |
| Author: Kirill Zhurovich |
| Run summary for MP #296: "TS/ECE density calibration"
Session leader : Kirill Zhurovich Physics Operator : Bob Granetz First half of the day - shots 1-22 Aim: get ECE cutoff data at different radii, so that later it will be possible to derive density calibration coefficients for TS from the calculated critical density values for ECE Low magnetic field (~4.6T): since it's easier to get cutoffs at lower Btor L-mode : to avoid abrupt cutoffs at the edge during L-H transition and avoid TS timing issues Results: We used to do this at lower field (4T) and GPC system. Since now we had to use GPC2 only, which does not have grating for this field, we were operating at 4.6T. Got multiple cutoffs at different radii, but mainly in the core plasma region. In order to get cutoffs at the very edge during flattop phase gas puff needs to be delayed. However, the edge was very cold at these densities, which hindered observations of the cutoffs. Moreover, we noticed that edge density was clamped during flattop phase of any discharge and somewhat independent of gas puff. Hope to pull out something from the edge data we got. Finally, tried RF shot to induce H-mode transition and cutoffs at the edge - did not work (superb RF, 2 very brief H-modes, no cutoffs). For details of each particular shot, see SL comments during the run. - |
| Entered: Nov 21 2005 03:09:13:773PM |
| Author: Steve Wukitch |
| Run summary:
Good H-mode threshold comparison discharges on 023, 024, 028, 030. Seems to be a fair bit of scatter in the plasma response and shot 028, 031 showed significantly disparate H-mode threshold values for D and E versus J depending upon their time in the pulse. Better electron, neutron, and stored energy response are seen in first RF pulse compared to the second RF pulse independent of which antenna is first. Radiation appears to be similar for the different antennas. |
| Physics Operator Summaries |
| Entered: Nov 17 2005 04:54:18:180PM |
| Author: Robert Granetz |
Physics operator summary for Thursday 17 Nov 2005:
MP#296: TS/ECE cross-calibration (1/2 day)
MP#438: J-antenna evaluation (1/2 day)
Session leader: T. Biewer (MP 296), S. Wukitch (MP 438)
Physics operator: R. Granetz
Tough day in the physop chair. The TS/ECE MP basically required density
ramps to the disruption limit. This resulted in an alternating
disruption/fizzle/disruption/fizzle sequence which persisted throughout
their portion of the run. Because of the high OH2U coax readings, there
were also a number of OH+TF shots required as well. The core ECE channels
were successfully cut off, but the edge channels were rather cool, so it's
difficult to find the cut off for them.
Around 14:00 we switched to the 2nd MP. J-antenna ran very well (up to 3
MW), as did D+E. Various comparisons of heating efficiency and H-mode
access between J and D+E were done. See the session leaders' summaries for
more details.
Even during the 2nd part of the day, the startups were not robust, and
there were lots of shots with runaways.
Scorecard: 15 plasmas
3 duds
10 fizzles
4 power supply tests
--------------
Total: 32 shot cycles
|
| Session Leader Comments | |||
| Nov 17 2005 09:16:18:980AM | 1051117001 | Kirill Zhurovich | Good cutoffs at R~71.3-76.5, 79.5, 83.7
next: correct TS alignment and increase Btor to 4.6T |
| Nov 17 2005 09:18:20:450AM | 1051117002 | Kirill Zhurovich | no plasma |
| Nov 17 2005 09:45:54:887AM | 1051117003 | Kirill Zhurovich | Cutoffs for R~68.5cm, 72.5-77.7, 81, and it's trickier at the edge, since there is not much signal there |
| Nov 17 2005 09:46:28:743AM | 1051117004 | Kirill Zhurovich | no plasma (as Bob's predicted) |
| Nov 17 2005 09:58:41:137AM | 1051117005 | Kirill Zhurovich | Good cutoffs at R~69.2-78.5 cm, 81.6cm |
| Nov 17 2005 10:10:20:683AM | 1051117006 | Kirill Zhurovich | no plasma
again there is shot/fizzle pattern due to disruptions |
| Nov 17 2005 10:33:24:387AM | 1051117007 | Kirill Zhurovich | early disruption |
| Nov 17 2005 10:47:02:887AM | 1051117008 | Kirill Zhurovich | fizzle |
| Nov 17 2005 11:09:50:540AM | 1051117009 | Kirill Zhurovich | Cutoffs for R~69.2-78.4cm, 81.6
next: delay the gas puff by ~100ms |
| Nov 17 2005 11:14:08:667AM | 1051117010 | Kirill Zhurovich | fizzle |
| Nov 17 2005 11:32:31:103AM | 1051117011 | Kirill Zhurovich | no plasma shot
next: in addition to the puf delay decrease the overall density to 2 (nl values) to avoid disruptions |
| Nov 17 2005 11:44:16:497AM | 1051117012 | Kirill Zhurovich | no plasma |
| Nov 17 2005 12:06:52:527PM | 1051117013 | Kirill Zhurovich | no plasma |
| Nov 17 2005 12:42:45:117PM | 1051117014 | Kirill Zhurovich | Cutoffs at R~69.2-78.4cm, 81.6cm
No edge cutoffs |
| Nov 17 2005 12:47:08:440PM | 1051117015 | Kirill Zhurovich | no plasma
next increase plasma current to 1MA decrease Btor to 4.55T |
| Nov 17 2005 12:57:31:147PM | 1051117016 | Kirill Zhurovich | strange shot
no cutoffs at all |
| Nov 17 2005 01:09:01:243PM | 1051117017 | Kirill Zhurovich | no plasma |
| Nov 17 2005 01:51:57:803PM | 1051117018 | Kirill Zhurovich | Cutoffs at R~71.5-76.7,79.8, 83.9 and probably 86.4 |
| Nov 17 2005 01:49:37:553PM | 1051117019 | Kirill Zhurovich | no plasma
next :add RF to get H-mode and cutoffs at the edge |
| Nov 17 2005 02:33:14:447PM | 1051117022 | Kirill Zhurovich | Nice RF!
a couple of H-mode blips, no cutoffs that's it for ECE calibration today |
| Nov 17 2005 02:52:49:680PM | 1051117023 | Steve Wukitch | 023 BT~4.5 T, Ip~1 MA, nl_04~0.8
D: ramp to 1 MW [1.1,1.5] sec E: ramp to 1 MW [1.1,1.5] sec J: ramp to 2 MW [0.6,1] sec result: plasma D: ran max faults at high power E: ran J: ran 2 faults |
| Nov 17 2005 03:13:19:337PM | 1051117024 | Steve Wukitch | 024 BT~5.2 T, Ip~1 MA, nl_04~0.9
D: ramp to 0.8 MW [1.1,1.5] sec E: ramp to 1.2 MW [1.1,1.5] sec J: ramp to 2 MW [0.6,1] sec result: plasma H-mode threshold D: ran 1 fault E: ran 1 fault J: ran |
| Nov 17 2005 03:31:36:587PM | 1051117025 | Steve Wukitch | fizzle |
| Nov 17 2005 03:34:29:850PM | 1051117026 | Steve Wukitch | dud |
| Nov 17 2005 03:57:30:913PM | 1051117027 | Steve Wukitch | dud |
| Nov 17 2005 04:25:59:243PM | 1051117028 | Steve Wukitch | 028 BT~5.2 T, Ip~1 MA, nl_04~0.9
D: ramp to 0.8 MW [1.1,1.5] sec E: ramp to 1.2 MW [1.1,1.5] sec J: ramp to 2 MW [0.6,1] sec result: plasma D: ran E: ran J: ran good comparison swap order of antennas |
| Nov 17 2005 04:26:15:320PM | 1051117029 | Steve Wukitch | fizzle |
| Nov 17 2005 04:47:58:913PM | 1051117030 | Steve Wukitch | 030 BT~5.2 T, Ip~1 MA, nl_04~0.9
D: ramp to 0.8 MW [0.6,1] sec E: ramp to 1.2 MW [0.6,1] sec J: ramp to 2 MW [1.1,1.5] sec result: plasma D: ran E: ran J: ran good comparison |
| Nov 17 2005 04:47:22:540PM | 1051117031 | Steve Wukitch | 031 BT~5.2 T, Ip~1 MA, nl_04~0.9
D: ramp to 0.8 MW [0.6,1] sec E: ramp to 1.2 MW [0.6,1] sec J: ramp to 2 MW [1.1,1.5] sec result: plasma D: ran E: ran J: ran good comparison H mode for J but not for D+E something to the order making it difficult to get into H-mode |
| Nov 17 2005 05:00:57:493PM | 1051117032 | Steve Wukitch | fizzle |
| Physics Operator Comments | |||
| Nov 16 2005 06:08:05:207PM | Robert Granetz | Loaded DPCS segment 2 from 1050620012 segment 3 (yes, 3). Re-called all the magnetics predictors to get the new BP16 coil. Then changed Btor in segment 2 to 4.6 T (123900 kA). Saved in /home/granetz/pcs_scratch shot 1051117000. Also loaded into model. | |
| Nov 17 2005 09:12:46:590AM | 1051117001 | Robert Granetz | Plasma. Good shot. Density ramped up to get the ECE cutoff at t=1.37 s, followed shortly thereafter by a density limit disruption. Btor=4.5 T (wanted 4.6). The new IR pyrometer peaks at 560 C on the disruption. It also sees the marfe start up just before the disruption. Lots of early runaways. Next shot: increase Btor to 4.6 T (126400 A). Also add 1 ms to prefill. |
| Nov 17 2005 09:18:11:340AM | 1051117002 | Robert Granetz | Fizzle. Next shot: no changes |
| Nov 17 2005 09:36:54:790AM | 1051117003 | Robert Granetz | Plasma. Good shot. Density limit disruption after the ECE cutoff. Btor=4.6 T. Good startup, almost no runaways. Inner wall gets to 560 C. Next shot: increase Btor to 4.65 (127800 A) |
| Nov 17 2005 09:45:04:040AM | 1051117004 | Robert Granetz | Fizzle. This is alternating just like the last time this run was tried on 1050620. Next shot: no changes. |
| Nov 17 2005 09:57:59:277AM | 1051117005 | Robert Granetz | Plasma. Good shot. Got ECE cutoff and density limit disruption. Next shot: Change unused wire 9 to be the usual B21 A-coil feedback (copy from recent shot). Also reduce prefill by 4 ms to see if we can get out of this alternating shot/fizzle/shot/fizzle pattern. |
| Nov 17 2005 10:09:31:277AM | 1051117006 | Robert Granetz | Dud. Next shot: add the 4 ms back to the prefill. |
| Nov 17 2005 10:37:06:683AM | 1051117007 | Robert Granetz | Plasma. Disrupted early due to an injection. Didn't get to the ECE cutoff. OH2U coax is okay. Next shot: reduce prefill by 2 ms. |
| Nov 17 2005 10:53:29:510AM | 1051117008 | Robert Granetz | Fizzle. Next shot: add 2 ms back to prefill. |
| Nov 17 2005 11:09:04:777AM | 1051117009 | Robert Granetz | Plasma. Good shot. Got the ECE cutoff and a density-limit disruption. Lots of early runaways. Next shot: no changes. I've tried to get out of the alternating fizzle pattern, but nothing has helped. Delay the density ramp programming by 100 ms. |
| Nov 17 2005 11:25:25:900AM | 1051117010 | Robert Granetz | Fizzle. What a surprise. Next shot: OH + TF only shot to tighten the OH2U coax back up, just to be on the safe side. |
| Nov 17 2005 11:32:38:870AM | 1051117011 | Robert Granetz | Test shot; OH + TF only. OH2U coax looks good. Next shot: reduce nl_04 to 2.0e20 m-2, hopefully to get edge channel cutoff without getting to density limit disruption. |
| Nov 17 2005 11:45:51:557AM | 1051117012 | Robert Granetz | Dud. OH2U didn't commutate. Steve Wolfe noticed that its switch didn't close at t = -0.7 s. Next shot: try again, after checking the supply. |
| Nov 17 2005 12:11:38:010PM | 1051117013 | Robert Granetz | Another OH + TF only shot. Next shot: go for plasma again. The density will be 2.0e20 m-2, so that we'll get the edge ECE channels cut off, but hopefully we won't get a density-limit disruption. |
| Nov 17 2005 12:33:21:090PM | 1051117014 | Robert Granetz | Plasma. Good shot. It's still difficult to determine whether the edge channels show a cut off, or whether they're just cold. Next shot: increase Ip to 1.0 MA (was 0.9), and decrease nl_04 to 1.9e20 m-2. |
| Nov 17 2005 12:47:14:177PM | 1051117015 | Robert Granetz | Fizzle. Still in the alternating pattern. Next shot: reduce Btor to 4.55 T (125000 A). (Was 4.65 T) |
| Nov 17 2005 01:14:04:553PM | 1051117016 | Robert Granetz | Plasma. Big burst of runaways from t=0.5 to 0.7 s. Density was under better control, but the plasma still disrupted. Next shot: Increase early density to 0.7e20 m-2 to see if we can avoid the runaways. Also reduce pre-fill by 1 ms, but it'll be a fizzle anyway. Also increase the OH1 and OH2's reverse PLC current limits to -30 kA. |
| Nov 17 2005 01:12:50:430PM | 1051117017 | Robert Granetz | Fizzle. Next shot: decrease Btor to 4.50 T (123600 A). |
| Nov 17 2005 01:24:03:820PM | 1051117018 | Robert Granetz | Plasma. Still disrupted at t=1.5 s. Next shot: fizzle. |
| Nov 17 2005 01:47:31:680PM | 1051117019 | Robert Granetz | Fizzle. Next shot: Turn on the RF in order to try and get an H-mode to enhance the edge temperature. Reduce nl_04 to 0.9e20 m-2. Keep Btor at 4.5 T. |
| Nov 17 2005 01:51:46:320PM | 1051117020 | Robert Granetz | Fizzle. This is the first time today that we've had two fizzles in a row. Next shot: OH + TF only shot. |
| Nov 17 2005 02:22:50:413PM | 1051117021 | Robert Granetz | OH + TF only test. Good OH2U resistance. Next shot: go for plasma again. |
| Nov 17 2005 02:36:17:913PM | 1051117022 | Robert Granetz | Plasma. Made it well down the ramp. Good 3 MW RF pulse, including J3 and J4. Only the briefest of H-modes though. No cutoff seen on the edge Te channels. End of MP 296. Now start with MP 438, J-antenna evaluation Next shot: Load segment 2 from 1051116028 segment 2. (5.2 T, 0.9 MA, 0.9e20 m-2, SNL) |
| Nov 17 2005 02:58:34:587PM | 1051117023 | Robert Granetz | Plasma. Good, full-length shot. J-antenna ramps up to 2 MW. D and E go later. H/(H+D)=10%. Next shot: no changes. |
| Nov 17 2005 03:12:48:180PM | 1051117024 | Robert Granetz | Plasma. Good, full-length shot. Similar to previous shot. Next shot: repeat, no changes. |
| Nov 17 2005 03:24:15:930PM | 1051117025 | Robert Granetz | Plasma, but very, very short. Next shot: OH + TF only reverse bridge shot. |
| Nov 17 2005 03:38:45:617PM | 1051117026 | Robert Granetz | OH+TF only, reverse bridge OH2U coax resistance = 1.5 micro-ohms. Next shot: go for plasma again. Pre-fill has been increased by 2 ms from shot 25. |
| Nov 17 2005 03:51:45:790PM | 1051117027 | Robert Granetz | Dud! I didn't expect that. Fields and gas look acceptable. Next shot: add -10 A to IC_EF4, increase prefill by another 1 ms. |
| Nov 17 2005 04:07:49:210PM | 1051117028 | Robert Granetz | Plasma. Good full-length shot. Good RF performance. Prf_J gets up to 3 MW, but it's not as good as D+E in getting the plasma into H-mode. There were lots of runaways. Next shot: add another 1 ms to prefill. |
| Nov 17 2005 04:17:44:023PM | 1051117029 | Robert Granetz | Fizzle. Next shot: reduce pre-fill by 2 ms. |
| Nov 17 2005 04:31:32:570PM | 1051117030 | Robert Granetz | Plasma. Good shot. J and (D+E) were swapped in time. Short H-modes. Awful startup, but there doesn't seem to be an alternative today. Next shot: no changes. |
| Nov 17 2005 04:42:01:820PM | 1051117031 | Robert Granetz | Plasma. Good full-length shot. Good D,E, and J performance. Almost no runaways. Next shot: no changes. |
| Nov 17 2005 04:53:31:867PM | 1051117032 | Robert Granetz | Fizzle. End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:00:59:307AM | Plasma | Ok | |
| 2 | 09:14:32:840AM | Plasma | Ok | |
| 3 | 09:27:52:090AM | Plasma | Ok | |
| 4 | 09:41:02:090AM | Plasma | Ok | |
| 5 | 09:54:07:933AM | Plasma | Ok | |
| 6 | 10:07:25:917AM | Plasma | Ok | |
| 7 | 10:29:22:387AM | Plasma | Ok | |
| 8 | 10:45:00:340AM | Plasma | Ok | |
| 9 | 10:58:09:650AM | Plasma | Ok | |
| 10 | 11:12:10:243AM | Plasma | Ok | |
| 11 | 11:28:51:480AM | Test | Ok | Reverse Bridge Shot |
| 12 | 11:41:59:370AM | Plasma | Bad | Commutation Switch Failure |
| 13 | 12:04:09:307PM | Test | Ok | Reverse-Bridge Shot |
| 14 | 12:19:26:760PM | Plasma | Ok | |
| 15 | 12:36:36:650PM | Plasma | Ok | |
| 16 | 12:49:53:137PM | Plasma | Ok | |
| 17 | 01:06:00:697PM | Plasma | Ok | |
| 18 | 01:19:16:523PM | Plasma | Ok | |
| 19 | 01:32:32:163PM | Plasma | Ok | |
| 20 | 01:48:52:680PM | Plasma | Ok | |
| 21 | 02:11:08:960PM | Test | Ok | OH TF Reverse Bridge shot |
| 22 | 02:25:02:523PM | Test | Ok | |
| 23 | 02:46:49:320PM | Plasma | Ok | |
| 24 | 03:00:13:883PM | Plasma | Ok | |
| 25 | 03:13:37:587PM | Plasma | Ok | |
| 26 | 03:30:39:240PM | Test | Ok | Reverse-Bridge |
| 27 | 03:44:44:163PM | Plasma | Ok | |
| 28 | 03:57:58:210PM | Plasma | Ok | |
| 29 | 04:11:06:680PM | Plasma | Ok | |
| 30 | 04:24:17:663PM | Plasma | Ok | |
| 31 | 04:37:24:070PM | Plasma | Ok | |
| 32 | 04:50:54:600PM | Plasma | Ok | |