| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Ian Hutchinson |
| Physics operator(s): | Bill Rowan |
| Engineering operator(s): | Ed Fitzgerald |
| Engineering Operator Run Comment |
| MP 386: Locked Modes in Upper Null SL: Hutchinson PO: Rowen EO: Fitzgera |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:03:523PM |
| Author: Ian Hutchinson |
| MP 386 Upper and Lower null locked modes. SL hutch This run was quite successful. We got most of what was proposed done. It seemed to be important to do upper/lower null comparisons in the same run, which required more shots, but we used fewer bisections in finding thresholds to compensate. Probably uncertainties were dominated by irreproducibility more than convergence. We lost 4 shots and a lot of time in the middle of the run because of computer problems, but managed to recover. Summary of shots for 1040317. Upper null locked mode. HX1 is velocity at locking time. 9999 means no lock. -999 means no data at lock. A-coil current IA is for A configuration. Thus negative is destabilizing. Shot Upper nl04 Bt Ip Hirex Hx1 IA 1 1 7 5.5 .8 -25 9999 -0 2 1 8.6 5.4 .97 -12 0 -0 4 1 8.8 5.4 .97 -15 0 -3500 5 1 8.5 5.4 .97 -16 0 -1230 6 1 7.7 5.4 .97 -14 0 -650 7 0 9.3 5.4 .97 0 9999 -0 (H-modes) 8 0 9 5.4 .97 9999 9999 -560 (No-hirex) 9 0 8.7 5.4 .97 +10 -999 -2650 (HVtrip) 10 0 8.7 5.4 .97 -7 -7 -1700 11 0 8.7 5.4 .97 -10 -10 -1100 (Dubious lock) 12 1 5.5 5.4 .97 -2 -999 0 (HVtrip) 17 1 5.0 5.4 .97 +20 9999 1700 (V-swing) 18 1 5.0 5.4 .97 +20 9999 1700 (V-swing) 19 1 5.0 5.4 .97 +21 9999 900 (V-swing) 20 1 5.0 5.4 .97 +15 9999 230 (V-swing) 22 1 5.0 5.4 .97 +6 0 0 (Injection) 23 0 5.9 5.4 .97 -13 0 0 24 0 5.0 5.4 .97 -10 9999 1100 25 0 4.6 5.4 .97 -5 -5 400 26 1 2.55 4.1 .6 -10 9999 400 27 1 2.4 4.1 .6 +15 +5 0 (V-swing) 28 0 3.0 4.1 .6 -20 9999 0 29 0 2.9 4.1 .6 -15 -3 -450 31 0 4.5 4.1 .6 -20 -7 -450 32 0 6.6 4.1 .6 0 9999 -450 (Noisy HR) 33 1 6.6 4.1 .6 -25 9999 -450 Obvious things discovered: 1. At 1 MA the effect of upper null on the velocity is opposite at low density to what it is at high density. That is, at nl04=9, the velocity is more negative in upper null, whereas at nl04=5 it is more positive in upper null. The statistics on this are undeniable. 2. There is a suggestion that this effect is present also at 600kA. 3. By the time we lock, we generally have a velocity quite close to zero. 4. There is locking that brings the velocity towards zero from both positive and negative directions. Further detailed analysis will be needed to see if there is a definite result that can be attributed to velocity differences. |
| Physics Operator Summaries |
| Session Leader Comments | |||
| Mar 17 2004 09:10:37:770AM | Ian Hutchinson | MP 386 Locked Mode Threshold in Upper Null Configurations. SL Hutch PO Rowan | |
| Mar 17 2004 09:23:38:583AM | 1040317001 | Ian Hutchinson | Upper null. 800kA. Changes to the recalled shot do not seem to be present. nl04=7e19, hirex -25km/s |
| Mar 17 2004 09:45:38:960AM | 1040317002 | Ian Hutchinson | Got 1MA, 8.6nl04, Perhaps locks at 1.52 sec in rampdown. Hirex -12km/s. |
| Mar 17 2004 09:45:49:740AM | 1040317003 | Ian Hutchinson | PS Dud |
| Mar 17 2004 04:18:44:890PM | 1040317004 | Ian Hutchinson | A-coil configuration -A: adverse, causing locking. A-coil current 3500A. Locked mode at .7-.75s. |
| Mar 17 2004 10:34:26:600AM | 1040317005 | Ian Hutchinson | Locked mode at 1s. A-coil 1230A. Nice slowing down from -20km/s to lock when the velocity is zero. |
| Mar 17 2004 10:43:08:270AM | 1040317006 | Ian Hutchinson | Disrupts at 1.6s. Locked at 1.12s. A-coil 650A. Rotation slows to zero again. |
| Mar 17 2004 10:59:06:257AM | 1040317007 | Ian Hutchinson | Switch to Lower Null. Got zero velocity early. A-coil current 0. Got H-modes, perhaps locks late, but hard to tell because of the H-modes. |
| Mar 17 2004 11:15:15:567AM | 1040317008 | Ian Hutchinson | No hirex data. Got 560A A-coil. H-mode only late 1.4s. No locked mode. Slot divertor configuration. Ask for 3000A A-coil. Ask for rxl +4mm. |
| Mar 17 2004 11:29:46:960AM | 1040317009 | Ian Hutchinson | Locked mode at 1s. A-coil 2650A. Hirex at +10, but trips at about .75s. Big ne loss at locking. |
| Mar 17 2004 11:42:26:897AM | 1040317010 | Ian Hutchinson | Locked mode at 1.1s. A-coil 1700A. |
| Mar 17 2004 11:53:04:257AM | 1040317011 | Ian Hutchinson | A-coil 1100A. Change in sawteeth at 1s, but locking somewhat uncertain. Has an injection there, also it's coming out of slot divertor around then. |
| Mar 17 2004 01:09:09:223PM | 1040317012 | Ian Hutchinson | Back to Upper null. A-coil off. Lower density to 6e19. Locked mode at 1.3s. Hirex data only to .8s. |
| Mar 17 2004 01:21:47:100PM | 1040317017 | Ian Hutchinson | A-coil polarity swapped:(correcting) 1700A. Upper null. nl04=5 no locked mode Hirex +10 to +30 km/s |
| Mar 17 2004 01:36:46:430PM | 1040317018 | Ian Hutchinson | Repeat. Clear step in velocity from +10 to +30km/s at 1s. It is not clear what might be causing it. |
| Mar 17 2004 01:52:05:913PM | 1040317019 | Ian Hutchinson | A-coil 920A (compensating). No locked mode. Hirex velocity step is very reproducible. Not caused by mode locking. |
| Mar 17 2004 02:09:47:130PM | 1040317020 | Ian Hutchinson | A-coil 230A. Hirex slightly lower. No locked mode. |
| Mar 17 2004 02:09:57:850PM | 1040317021 | Ian Hutchinson | No power shot. |
| Mar 17 2004 02:33:30:023PM | 1040317022 | Ian Hutchinson | A-coil 0A. Big injection at .94s. Plasma is cold after that. It seems locked. |
| Mar 17 2004 02:49:27:363PM | 1040317023 | Ian Hutchinson | Lower Null. A-coil 0A. Locks at 1.17s. Hirex -12km/s. |
| Mar 17 2004 03:00:50:973PM | 1040317024 | Ian Hutchinson | A-coil 1100A. No locked mode. Hirex -10km/s flat. |
| Mar 17 2004 03:15:12:277PM | 1040317025 | Ian Hutchinson | A-coil 400A. Locked mode at 1.26s Hirex -5km/s |
| Mar 17 2004 03:37:09:187PM | 1040317026 | Ian Hutchinson | Change to Bt=4T, Ip=.6MA, nl04=4, A-coil=400 (compensating) Upper null. Runs ok. ECE is difficult because of lower Bt. Using GPC2 channel 14. No evidence of locking. Hirex -10 to 0 km/s. |
| Mar 17 2004 03:51:27:597PM | 1040317027 | Ian Hutchinson | A-coil 0A. Locks at 1.325s. Hirex swings from -10 to +15 then back to 0 on locking. |
| Mar 17 2004 04:16:42:683PM | 1040317028 | Ian Hutchinson | Lower null 4T, .6MA, 3e19nl04 A-coil =0A. No Lock. |
| Mar 17 2004 04:31:00:643PM | 1040317029 | Ian Hutchinson | A-coil to -A configuration, causing locking. (Lower null) Locks at 1.3s. nl04=2.9. Hirex -15km/s till lock. |
| Mar 17 2004 04:45:23:290PM | 1040317030 | Ian Hutchinson | Raise nl04 to 5-6. Fizzle because of an excess fill pressure. |
| Mar 17 2004 04:54:38:180PM | 1040317031 | Ian Hutchinson | Locks at 1.27s. nl04=4.5 (lower null) |
| Mar 17 2004 05:12:19:800PM | 1040317032 | Ian Hutchinson | nl04=6.6, no locked mode (A-coil 400A) |
| Mar 17 2004 05:17:34:433PM | 1040317033 | Ian Hutchinson | Upper null. No locked mode. nl04=6.6 (A-coil 450A.) Hirex -25 noisy. |
| Physics Operator Comments | |||
| Mar 17 2004 07:24:30:210AM | Bill Rowan | Engineering setup for Wednesday, March 17, 2004 MP 386: Locked Modes in Upper Null Session leader: Hutchinson Physics operator: W. Rowan ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Bake at 60 C overnight as well. Run begins at 09:00 and ends at 17:00. Power systems the same as 1031125020. Note: This is a guess for a starting point. Archived data not available. A-coils should be enabled. There will be changes from the standard configuration. Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) Disable NINJA Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB Necessary diagnostics: Standard core profile diagnostics, specifically including Hirex (for Ti profiles and rotation), core TS, VB, GPC 1 and 2, FRC ECE, neutrons Desirable diagnostics: DNB and all beam diagnostics ------------------------------------------------------------------------------- RF Setup: No RF needed for this run. ------------------------------------------------------------------------------- Run Plan. See MP386. Before the run began. The A-coils were configured in this way BTOP 0.00 BBOT 0.00 DTOP -1.00 DBOT +1.00 GTOP 0.00 GBOT 0.00 JTOP +1.00 JBOT -1.00 Alternator will be 15 to 30 minutes late ECDC off at approximately 7am | |
| Mar 17 2004 07:48:30:240AM | Bill Rowan | Loaded shot 1031125020 A-coil current demand is 2500A nl_04 increased from 8e19 to 9e19 | |
| Mar 17 2004 07:54:55:460AM | Bill Rowan | IP = 1 MA | |
| Mar 17 2004 08:11:55:507AM | Bill Rowan | Startup: loaded segment 1 from 1040316020. Next to last shot from yesterday. Segment 3 on for the first shot. This is 1.0MA Upper Null | |
| Mar 17 2004 08:22:51:350AM | Bill Rowan | Asked Steve to double check the a-coil hook up -- reports okay. | |
| Mar 17 2004 08:47:28:740AM | Bill Rowan | Changed A-coil current demand to 4000kA | |
| Mar 17 2004 08:50:45:473AM | Bill Rowan | Disabled the A-coils for the first shot. | |
| Mar 17 2004 09:14:05:257AM | 1040317001 | Bill Rowan | 001. IP is 0.8 MA approx nl_04 = 7e+19 Changes before the start of the run were made in segment 02 For next shot. IP = 1.0MA nl_04 = 9e+19 |
| Mar 17 2004 09:20:59:083AM | 1040317001 | Bill Rowan | Bt changed from 5.5T to 5.4 T 150000 to 147000 |
| Mar 17 2004 09:31:59:960AM | 1040317002 | Bill Rowan | 002. BT = 5.4 T IP = 0.96 MA nl_04 = 8.5 e+19 |
| Mar 17 2004 09:34:14:193AM | 1040317002 | Bill Rowan | For next shot. A-coils enabled |
| Mar 17 2004 09:48:53:710AM | 1040317003 | Bill Rowan | 003. Nothing on this shot. Dud I_square_t fault After the shot: Cell entry for TCI Cell entry for LHCD |
| Mar 17 2004 10:04:02:537AM | 1040317003 | Bill Rowan | Engineering fault not understood. Will simply go again. Next shot. No PCS changes. |
| Mar 17 2004 10:13:51:100AM | 1040317004 | Bill Rowan | 004. Plasma. Next shot. A-coil demand reduced to 1700 A |
| Mar 17 2004 10:29:38:240AM | 1040317005 | Bill Rowan | 005. Plasma A coil current was 1250 A for 1700 demand Next shot. Reduce A-coil current to approximately half of current value A coil current demand is 1100 A |
| Mar 17 2004 10:45:05:333AM | 1040317006 | Bill Rowan | 006. A coil current was 550 A for a demand of 1250 A Next shot. A-coils disabled for the next shot. Switch to segment 02 which is a lower null. |
| Mar 17 2004 10:53:27:663AM | 1040317007 | Bill Rowan | 007. Plasma. A-coils disabled. H-modes appear after approximately 0.6 s BT = 5.4 T IP = 0.95 MA approx nl_04 = 9e19 prior to H-mode |
| Mar 17 2004 11:09:21:803AM | 1040317007 | Bill Rowan | Next shot. Enable A-coils. A-coil demand of 1100 A |
| Mar 17 2004 11:06:19:317AM | 1040317008 | Bill Rowan | 008. Plasma A-Coil current = 550 A Next shot. A-coil demand 0f 3000 A |
| Mar 17 2004 11:08:22:677AM | 1040317008 | Bill Rowan | Add approx 4 mm to rxl |
| Mar 17 2004 11:19:00:240AM | 1040317009 | Bill Rowan | 009. Plasma A-coil current = 2649 Next shot A-coil current demand of 2100 |
| Mar 17 2004 11:33:32:660AM | 1040317010 | Bill Rowan | 010. Plasma A-coil current = 1677 Next shot. Add another 2 mm to rxl A-coil demand is reduced to 1600 |
| Mar 17 2004 11:49:43:600AM | 1040317011 | Bill Rowan | 011. Plasma A-coil current = 1155 Next shot. Switch to segment 03. This is upper null. Reduce the nl_04 to 0.6e+20 Disable the a-coils |
| Mar 17 2004 12:09:15:067PM | 1040317012 | Bill Rowan | 012. Plasma nl_04 reduced. A-coils disabled Upper null as requested After this shot Cell access to reverse the polarity of the A-coils Cell access to look for camac problems. We are having intermittent data loss. Next shot. Reverse polarity of the A-coils Enable the A-coils. A-coil current demand to 2100 A and expect this to produce a coil current of 1700 A |
| Mar 17 2004 12:37:28:537PM | 1040317013 | Bill Rowan | 013. No power shot. Computer hang in init |
| Mar 17 2004 12:37:45:977PM | 1040317014 | Bill Rowan | 014. No power shot. Computer problems. |
| Mar 17 2004 12:50:51:757PM | 1040317015 | Bill Rowan | 015. No power shot. Computer problems. uter problems. |
| Mar 17 2004 12:55:48:537PM | 1040317016 | Bill Rowan | 016. Dud. Power supply problem. Supply remained disabled |
| Mar 17 2004 01:12:18:863PM | 1040317017 | Bill Rowan | 017. Plasma. A-coil current = 1700 A Next shot A-coil current demand reduced to 1400 A |
| Mar 17 2004 01:33:25:147PM | 1040317018 | Bill Rowan | 018, Plasma Next shot. A-coil current demand = 1400 A |
| Mar 17 2004 01:42:15:600PM | 1040317019 | Bill Rowan | 019. Plasma A-coil current = 900 A Next shot. A-coil current demand = 800 A |
| Mar 17 2004 01:53:35:167PM | 1040317020 | Bill Rowan | 020. Plasma A-coil current = 245 A Next shot. Disable the a-coils. |
| Mar 17 2004 02:07:36:313PM | 1040317021 | Bill Rowan | 021. No power shot. |
| Mar 17 2004 02:24:14:323PM | 1040317022 | Bill Rowan | 022. Plasma A-coils off Next shot: Change configuration: SNL, segment 2 Reduced nl_04 to 6E+19 |
| Mar 17 2004 02:38:30:203PM | 1040317023 | Bill Rowan | 023. Plasma Lower null Next shot. Enable the A-coils Increase the a coil current to 1000 A. Set demand to 1600 A |
| Mar 17 2004 02:53:48:103PM | 1040317024 | Bill Rowan | 024. Plasma A-coil current is 1150 A Next shot. A-coil current = 500 A Set demand to 950 A |
| Mar 17 2004 03:17:14:310PM | 1040317025 | Bill Rowan | 025. Plasma A-coil current is 430 A Next shot Upper null nl_04 = 4e+19 IP = 600 kA BT = 4T A-coils sto approximately 400 A Demand set to 1000 A |
| Mar 17 2004 03:35:01:697PM | 1040317026 | Bill Rowan | 026, Plasma IP = 0.58 MA BT = 4.0T nl_04 = 0.37e+20 at 0.8 s A-coil = 490 A Next shot. Disable the a-coils |
| Mar 17 2004 03:44:18:557PM | 1040317027 | Bill Rowan | 027. Plasma A-coil is off. Next shot. lower null. leave the A-coil off nl_04 = 4e+19 IP = 600 kA BT = 4T |
| Mar 17 2004 03:58:03:390PM | 1040317028 | Bill Rowan | 028. Plasma IP = 0.59 MA BT = 4.0T nl_04 = 4.2e+19 at 0.99s A-coil = 0.0 |
| Mar 17 2004 03:58:19:047PM | 1040317028 | Bill Rowan | Next shot. Reverse the polarity of the A-coils |
| Mar 17 2004 04:05:32:853PM | 1040317028 | Bill Rowan | A-coil demand set for 1000 A A-coil current intended to be 500 A |
| Mar 17 2004 04:08:09:623PM | 1040317028 | Bill Rowan | Enable the A-coils |
| Mar 17 2004 04:22:56:410PM | 1040317029 | Bill Rowan | 029. Plasma A-coil = 468 A Next shot. nl_04 = 5e+19. Inserted a ramp to 6e+19 to compensate for the droop observed on previous shot. |
| Mar 17 2004 04:38:50:483PM | 1040317030 | Bill Rowan | 030. Fizzle Prefill increased suddenly for this shot. Next shot. Disabled the DNB GV This is an unlikely source for the problem as the beam is at low pressure and the gas is not being puffed. |
| Mar 17 2004 04:52:37:833PM | 1040317031 | Bill Rowan | 031. Plasma. Next shot: Removed negative bias from pg3 after 1s nl_04 demand at 0.5 s increased to 6e+19 Ramped to 7e+19 at 1.5s |
| Mar 17 2004 05:02:41:253PM | 1040317032 | Bill Rowan | 032. nl_04 = 6.4e+19 at 1s Next shot: Configuration changed to upper null (segment 3) For segment 03 Removed negative bias from pg3 after 1s nl_04 demand at 0.5 s increased to 6e+19 Ramped to 7e+19 at 1.5s |
| Mar 17 2004 05:22:08:130PM | 1040317033 | Bill Rowan | 033. Plasma Last shot. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:06:52:880AM | Plasma | Ok | |
| 2 | 09:21:48:177AM | Plasma | Ok | |
| 3 | 09:42:43:477AM | Plasma | Bad | All Power supply breakers opened |
| 4 | 10:06:16:693AM | Plasma | Ok | |
| 5 | 10:20:05:990AM | Plasma | Ok | |
| 6 | 10:32:41:113AM | Plasma | Ok | |
| 7 | 10:45:11:977AM | Plasma | Ok | |
| 8 | 10:58:14:990AM | Plasma | Ok | |
| 9 | 11:12:06:803AM | Plasma | Ok | |
| 10 | 11:26:02:727AM | Plasma | Ok | |
| 11 | 11:38:32:460AM | Plasma | Ok | |
| 12 | 11:51:02:147AM | Plasma | Ok | |
| 13 | 12:22:55:473PM | Plasma | Bad | NO Power Shot due to Actmon |
| 14 | 12:34:28:990PM | Plasma | Bad | No Power Shot Act |
| 15 | 12:42:58:070PM | Test | Ok | |
| 16 | 12:51:46:630PM | Plasma | Ok | |
| 17 | 01:04:41:007PM | Plasma | Ok | |
| 18 | 01:19:41:507PM | Plasma | Ok | |
| 19 | 01:33:36:147PM | Plasma | Ok | |
| 20 | 01:49:28:897PM | Plasma | Ok | |
| 21 | 02:04:02:853PM | Plasma | Bad | TCI lost before pulse, shot aborted |
| 22 | 02:18:40:503PM | Plasma | Ok | |
| 23 | 02:31:37:757PM | Plasma | Ok | |
| 24 | 02:47:10:217PM | Plasma | Ok | |
| 25 | 03:02:38:490PM | Plasma | Ok | |
| 26 | 03:20:13:987PM | Plasma | Ok | |
| 27 | 03:37:27:390PM | Plasma | Ok | |
| 28 | 03:50:43:783PM | Plasma | Ok | |
| 29 | 04:16:49:620PM | Plasma | Ok | |
| 30 | 04:30:08:533PM | Plasma | Ok | |
| 31 | 04:43:31:770PM | Plasma | Ok | |
| 32 | 04:56:11:260PM | Plasma | Ok | |
| 33 | 05:10:33:080PM | Plasma | Ok | |