| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Unknown |
| Physics operator(s): | Ron Parker,Ian Hutchinson |
| Engineering operator(s): | Frank Silva |
| Engineering Operator Run Comment |
| MP#230 Parker,Hutch/Silva |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:19:163PM |
| Author: To Be Determined |
| Run Plan for 990218 Miniproposal 230: Effect of Divertor Baffling on Confinement, Thresholds and the ELM-free/EDA Boundary Physop: Parker/Hutchinson Overnight ECDC in D2 Engineering Setup: Power supply setup as in shot 990217025 TF under hybrid control Gas setup: B-top 6 psi D2 Hybrid enabled C-side 30 psi D2 Hybrid enabled B-side lower 1 psi of Ar Hybrid disabled Plan: Begin with MP 214; then move into miniproposal 230 when proper conditions are established. MP 230 Effect of Divertor Baffling on Confinement PURPOSE: Obtain information on, (1) effect of the flapper on confinement in L-mode, ELM-free and EDA discharges (2) effect of the flapper on neutral densities at the midplane and divertor under these conditions We will run pairs of discharges, first with flapper closed for the entire discharge and then flapper open in a comparison discharge. start: Ip = 0.8 MA, Bt = 5.3 T, D2, nl04 target 1.0e20, two phases of RF heating 0.3 s long each (1 MW and 2 MW approx). after: vary nl04 target density and Ip to get our target regimes, L-mode, ELM-free and EDA argon: start with no argon, then later standard puff at 0.3 key diag's: all pressure gauges, div RGA, HIREX, chromex In addition to the gas setup specified in Parker's bulletin, I strongly suggest that we have the capability to run between-shot ECDC in Helium through B-side-upper valve (as was done 990202, for example). We may need H in one of the plenums because the H/D fraction was the lowest yet yesterday. D-port waveform: [0.,0.,2.6,3.2,2.8,2.8,3.,3.,2.7,2.7,3.,3.,0.,0.], *,[0.,.9,.90001,1.1,1.1001,1.125,1.12501,1.15,1.15001,1.175,1.17501,1.2,1.20001,1.4089] E-port waveform:[0.,0.,0.,.3,1.2,1.2,.8,.8,1.2,1.2,.6,.6,1.2,1.2,.4,.4,1.,1.,0.,0.,0.], *, [0.,.1,.5,.5001,.75,.78,.78001,.8,.8001,.82,.82001,.84,.84001,.86,.86001,.88,.88001,.9,.90001,1.20001,4.] E-port coefficients: [-.754546,.520706,-2.83353] ST1: 565 PS1: 424 ST2: 2502 PS2: 985 Vacuum conditioning before start of run ST1: 662 PS1: 327 ST2: 2892 PS2: 454 128 .5->1.5 .8->1.0 129 1.5->2 .8->1.0 ST1: 565 PS1: 424 ST2: 2502 PS2: 985 001 power supply problem 002 early disruption - chopper supply failed 003 EFC test 004 fizzle 005 fizzle 006 fizzle 007 fizzle 008 fizzle 009 fizzle 010 fizzle 011 fizzle 012 plasma good RF ramps three faults on #1 the first two were MIT Arc and phase balance the last was MIT arc, pppl arc and phase balance from the fast scope, the reflected power is spiking up when the MIT arc detector fires. Calculated MW_coefficients for D-port: [-2.0398731,-0.11517370,-0.73490295] E-port: [-0.95418678,0.099974625,-2.5148038] 013 fizzle 014 015 016 017-025 fizzle 026 plasma good H->L neutron event beginning @1.146 sec 1.109 sec voltage limit and MIT arc detect 1.116 sec MIT arc,voltage limit, and phase balance 1.125 sec voltage limit and phase balance 027 plasma no JOEGER_2 data - ie no tuned RF power Using 026 and 027, MW_coefficients were calculated once again: D-port: [-2.1884471,-0.38350071,-0.22212792] E-port: [-1.24188,0.029231706,-1.9403619] ***************** *** SUMMARY *** ***************** With three discharges, improvement was incremental in D and E-port ICRF systems. We have eliminated the false phase balance faults resulting from antenna mutual coupling (induced power was exceeding threshold power when the antenna was supposed to be off). We also verified that the MIT arc detection was faulting properly on reflected power using fast digital scope to monitor forward and reflected power on a fast time base. The FPA screen current tracked forward power instead of reflected power. The fault indications on #2 which occur without power are not causing real fault actions (turning off the rf). The fault indication board is probably oversensitive. Issues associated with the power feedback were not tested well enough to draw conclusions. Preliminary indications suggest that power feedback is still insufficient. The remaining issue to be addressed tomarrow is to run the transmitters together with 1.25 MW out of each with controlled RF power. On the three shots, reasonable power was generated with each system run separately. H-modes were obtained. In fact on 990218026 and 027, H->L neutron events were observed. |
| Physics Operator Summaries |
| Session Leader Comments |
| Physics Operator Comments | |||
| Feb 18 1999 09:31:14:983AM | Ian Hutchinson | Ron Parker is in the chair. I am just watching. | |
| Feb 18 1999 09:43:13:170AM | 990218001 | Josh Stillerman | This shot was a dud |
| Feb 18 1999 09:44:58:310AM | 990218002 | Josh Stillerman | This shot disrupted due to lack of chopper horizontal field control. |
| Feb 18 1999 10:08:00:107AM | 990218003 | Josh Stillerman | This was a test of the chopper power supply. Chopper supply appears OK. |
| Feb 18 1999 11:07:54:890AM | 990218006 | Ian Hutchinson | Hutch standing in for Parker during teaching. Fizzle. Reached 50kA before dying. Pulse gas fill to 6ms at -1s with pressure 20 psi OH1 V to 150 V at 7-10ms, from 200V OH2 to 12V from 16V. Should increase the Bz ramp rate, although not clear this is the right thing to do. |
| Feb 18 1999 11:23:32:590AM | 990218007 | Ian Hutchinson | Fizzle. Got to 50kA again. Got almost exactly the same fill pressure. Do the opposite on the Bz OH1 V to 250V, OH2 to 20V. |
| Feb 18 1999 11:44:41:250AM | 990218008 | Ian Hutchinson | Fizzle. Got a solid 50kA this time but it just hangs there. No signal on the ECE to tell where it went. On shot 2 which went, the ECE shows the initial plasma well inside. Fill puff to 7ms from 6ms. EF3 to 2200V from 2400 V at 10ms. Try to slow the Bz more. The last change did not do much. |
| Feb 18 1999 12:03:01:293PM | 990218009 | Ian Hutchinson | Fizzle. Extremely similar to previous. EF4 to -1275 from -1270 |
| Feb 18 1999 12:11:55:903PM | 990218010 | Ian Hutchinson | Fizzle. Very similar. Nothing I do seems to change it! Import segment 1 from 990211030. This was a good day. EF4 to -1270. It was -1285 in that segment. Got a warning that the name in P15 was changed. This is false. It is EF4_U and has always been. Messages include: About to set def back to \HYBRID::TOP SEG_NAMES STRING = Array[2] \HYBRID::TOP.PCS.SEG_01 \HYBRID::TOP.PCS.SEG_02 SEG_NUMS LONG = Array[2] 1 2 % Compiled module: X_COMPLAIN. % XMANAGER: The MODAL keyword to the XMANAGER procedure is obsolete. It is superseded by the MODAL keyword to the WIDGET_BASE function. ST FLOAT = -3.50000 ST FLOAT = 0.100000 Filling in configuration /28-JAN-1999 08:23:22.55/ Cleaning PCS tree in SCRATCH_DISK:[HUTCH] copying SCRATCH_DISK:[HUTCH]PCS_MODEL.TREE to CMOD$MODELS:[HYBRID.PCS]PCS_MODEL. T |
| Feb 18 1999 12:55:45:483PM | 990218011 | Ian Hutchinson | Fizzle. TF breaker pulls. Gets to 60kA before fizzling. Nice early breakdown at 5ms. This now looks as if it does not have enough Bz at the current peak. TF fuse is apparently the same one as before. Lower OH1 to 100V from 200V and Oh2 to 8V from 16V during 5-10ms. |
| Feb 18 1999 01:12:04:950PM | 990218012 | Ian Hutchinson | Plasma till 1.66s. Amazingly fast current rise. RF ramps seem to work. H-mode transition at just over 1 MW. H/D=.05 No changes. |
| Feb 18 1999 01:34:14:217PM | 990218013 | Ian Hutchinson | Fizzle at 35kA. Br is .002 mT negative. Current rise rate is greatly reduced. Raise Br offset to 4.5 mT from 3.mT |
| Feb 18 1999 01:44:34:140PM | 990218014 | Ian Hutchinson | Fizzle at 42 kA for 8 ms. Close to going. Helium ECDC for 5 minutes. No other changes. Back to Parker. |
| Feb 18 1999 02:06:04:700PM | 990218015 | Ian Hutchinson | Fizzle More ECDC |
| Feb 18 1999 02:12:00:327PM | 990218016 | Ian Hutchinson | Fizzle. Somewhat worse if anything. Lower OH1 to 50V at 5-10 ms. |
| Feb 18 1999 02:20:02:967PM | 990218016 | Ian Hutchinson | C-top D_alpha array seems to indicate that shots 16 and 17 end with the light at the outboard. In other words the second lump on the signal, from 15 to 20 ms is predominant in the channels that are from .81m outwards (These radii are quoted at the level of the nose.) |
| Feb 18 1999 02:33:30:577PM | 990218017 | Ian Hutchinson | Fizzle. Lower the fill puff to 5(.5)ms. |
| Feb 18 1999 02:51:37:763PM | 990218018 | Ian Hutchinson | Fizzle the gas did not change. It was not loaded properly. Make the change. C-Top profiles from JT with calibrations accounted for seem to show the opposite, that the plasma dies on the inside on a fizzle. On the plasma shot the D_alpha fills in across the radius during 14-20 ms. |
| Feb 18 1999 02:57:28:310PM | 990218019 | Ian Hutchinson | Fizzle Increase the OH1 to 200-100 from 5ms to 10 ms. |
| Feb 18 1999 03:31:20:030PM | 990218022 | Ian Hutchinson | Relaoded shot 2, got a Dud We forgot to reduce the fill pulse to account for the higher plenum pressure so we got .23 mtorr, way too high. |
| Feb 18 1999 03:56:27:403PM | 990218023 | Ian Hutchinson | Fizzle with the settings from shot 2 and reasonable pressure Bz is a little too high. EF4 lowered to -1275 from -1260A. |
| Feb 18 1999 04:05:27:357PM | 990218024 | Ian Hutchinson | Fizzle 50 kA. EF4 to -1285A |
| Feb 18 1999 04:33:29:340PM | 990218025 | Ian Hutchinson | Fizzle. BR offset to 3.5mT from 4.5mT. |
| Feb 18 1999 04:33:54:967PM | 990218025 | Ron Parker | Shots 13-25 have been fizzles, for reasons which are obscure. Various fixes have been tried: increase/decrease fill pressure, increase/decrease EF 4 current and increase /decrease OH 1 voltage, but with no success. Return to the settings of shot 2 also did not succeed. Finally, a 1 mT decrease BR resulted in a successful shot. |
| Feb 18 1999 04:34:25:513PM | 990218026 | Ian Hutchinson | Plasma. Perhaps we ought to have believed in the need for a lower BR. Shot 12 certainly had it. No changes. |
| Feb 18 1999 04:47:37:937PM | 990218027 | Ron Parker | No changes - why tamper with success? ECDC employed between shots. |
| Feb 18 1999 05:03:05:623PM | 990218028 | Ron Parker | Back to the fizzles! |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:02:43:890AM | Plasma | Ok | Check EFc chopper |
| 2 | 09:20:25:793AM | Plasma | Ok | efc no go blown fuses |
| 3 | 10:03:00:590AM | Plasma | Ok | EFc test ok |
| 4 | 10:21:45:513AM | Plasma | Ok | No Faults |
| 5 | 10:34:59:140AM | Plasma | Ok | No Faults |
| 6 | 10:53:06:890AM | Plasma | Ok | No Faults |
| 7 | 11:08:14:590AM | Plasma | Ok | No Faults |
| 8 | 11:22:07:043AM | Plasma | Ok | No Faults |
| 9 | 11:42:53:250AM | Plasma | Ok | No Faults |
| 10 | 11:57:54:280AM | Plasma | Ok | No Faults |
| 11 | 12:14:52:357PM | Plasma | Ok | No Faults |
| 12 | 12:53:56:590PM | Plasma | Ok | No Faults |
| 13 | 01:09:14:013PM | Plasma | Ok | No Faults |
| 14 | 01:27:16:590PM | Plasma | Ok | no faults |
| 15 | 01:44:05:467PM | Plasma | Ok | No Faults |
| 16 | 02:03:40:373PM | Plasma | Ok | no faults |
| 17 | 02:17:52:187PM | Plasma | Ok | no faults |
| 18 | 02:28:38:530PM | Plasma | Ok | no faults |
| 19 | 02:41:20:560PM | Plasma | Ok | no faults |
| 20 | 02:56:11:280PM | Plasma | Ok | no faults |
| 21 | 03:12:20:140PM | Plasma | Ok | no faults |
| 22 | 03:25:11:420PM | Plasma | Ok | no faults |
| 23 | 03:42:06:437PM | Plasma | Ok | no faults |
| 24 | 03:55:06:640PM | Plasma | Ok | no faults |
| 25 | 04:09:03:543PM | Plasma | Ok | no faults |
| 26 | 04:22:57:983PM | Plasma | Ok | no faults/plasma |
| 27 | 04:43:30:810PM | Plasma | Ok | no faults/plasma |
| 28 | 04:56:40:513PM | Plasma | Ok | no faults |