| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Earl Marmar |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Gary Dekow |
| Engineering Operator Run Comment |
| MP#318 - High performance H-modes at 5.3 T; SL: Marmar PO: Wolfe EO: Dek |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:32:803PM |
| Author: To Be Determined |
| Subject: session leader run summary 1030529: High performance H-Modes at 5 Tesla From: "E. Marmar" Date: Mon, 02 Jun 2003 11:50:48 -0400 Newsgroups: psfc.cmod.ops This run was an attempt to satisfy one or both of Milestone 67: Evaluate integrated H-mode performance with 6 MW ICRF, Ip \ge 1.2MA. and the FY03 plain english goal: Higher Performance Plasmas-- Produce high temperature plasmas with 5 Megawatts of radio frequency heating for pulse lengths of half a second. These plasmas should achieve conditions where the relative importance of plasma particle collisions is similar to what is expected for the burning plasma regime. The studies of the susceptibility of the plasma to instabilities and the losses of plasma across the confining field under these conditions should therefore be applicable to predicting the performance of next-step experiments. The miniproposal for this run is MP 318, high performance H-Modes at 5.3 Tesla. Results: We made some progress toward the goals, achieving total ICRF powers ~5 MW for up to 0.1 s intervals on several shots. H/(H+D) fractions were typically in the 0.08 to 0.1 range, probably too high for optimal minority heating; radiated power fractions were also on the high side, and the H-modes were not steady state. The better shots include 7, 20, 22, 24, and 25, with operation at 1.2 and 1.0 MA. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:18:020PM |
| Author: To Be Determined |
| Physop summary for Thursday, May 29, 2003 MP#318 "High performance H-modes at 5.3 T" SL: Marmar PO: wolfe Setup and Plan -------------- Overnight ECDC in D2 at 2e-4, bake at 60C Power Systems as on 1030528030 (including C-coil) Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) Enable the following gate valves, assuming no vacuum problems: ECE, DNB, VUV Run Plan -------- Start at 1.2MA, target density nl4~1e20, and wait for the RF guys to get the power up to 4-5MW for 0.5sec. Raise the target density to 1.6e20 in 3 steps, and evaluate the EDA/ELM behavior. Choose best (by some definition) target density and try to raise power to max available. Raise current to 1.4MA and maybe the elongation and/or triangularity. Try for neutrons. Results ------- The main goals were to try to satisfy some combination of the PEG calling for 5MW of ICRF for 0.5sec and MP#67 for H-modes at 6MW, Ip>1.2MA. We were not successful in either, although we did get closer than in previous attempts. The confinement was not good; maximum Wmhd was around 170kJ at both 1.0 and 1.2 MA, even with launched power over 5MW. We started at 1.2MA, with a slightly tweaked equilibrium derived from 1030528030. After a couple of unexplained disruptions, I reloaded seg2 from that shot, which seemed to eliminate the disruptions, although it brought back a crossover thrash. We tried raising the density, and also increasing the elongation and triangularity, getting q up to 3.6, but the H-modes were not very eda-like. Between shot ecdc was used to restrain the increase in H/D, which was rising during the shots from .07 -> .12. J-port had difficulty staying on, and D had to be backed down in power to avoid overshooting due to a feedback problem. Target density was increased to 1.3e20 (nl04). At shot#16 we dropped the current to 1.05MA to try to increase the EDA nature. This was moderately successful, but the radiation and H/D remained high; Zeff and Mo were on the high side. It appears we need a fresh boronization. The highest RF power obtained was 6.2MW for a very short interval. We had several shots with RF over 5MW for multiple pulses over 100msec, but never got J to stay on for .5sec. E-port was the steadiest performer, regularly running at 1.9MW for .6sec without faulting. Best shot oveall may have been #25. Target density was dropped over several shots from 1.3e20 to 0.9e20 in an attempt to improve the RF situation. On shot#26 we tried increasing the gaps, on the theory that this might reduce the loading variability associated with gap changes at L-H and H-L transitions; this seemed to make problems worse for the RF, so on shot#27 we tried decreasing the gaps. This resulted in a disruption at 0.75sec. On shot#26, BP13_JK, which is used in processed data (EFIT), died during the shot. I replaced it in the processed set with BP13_BC, which is used in the hybrid. The JK loop recovered on shot #27. The EFIT on shot#26 has been re-run with the BP_12 weight turned off. We ran the A-coil all day, in "suppression" phasing. There were no obvious locked modes. ECDC between shots slows the cycle down by about 5minutes, but seemed necessary given the H/D. After some tweaking I ended up with a PG4 pulse of 20msec, and we entered init fairly routinely at a base pressure of 3.5e-6Torr on ITG. Only one shot had significant runaways. Startups were pretty reliable. Scorecard --------- Tests 0 Duds 0 Fizzles 2 Plasmas 25 ------ -- Shots 27 |
| Session Leader Comments | |||
| May 29 2003 09:32:23:263AM | Earl Marmar | Today's run is aimed at meeting the FY03 level 1 DOE milestone: Higher Performance Plasmas [Sep 03] Produce high temperature plasmas with 5 Megawatts of radio frequency heating for pulse lengths of half a second. These plasmas should achieve conditions where the relative importance of plasma particle collisions is similar to what is expected for the burning plasma regime. The studies of the susceptibility of the plasma to instabilities and the losses of plasma across the confining field under these conditions should therefore be applicable to predicting the performance of next-step experiments. | |
| May 29 2003 10:50:33:670AM | 1030529006 | Earl Marmar | multiple H-modes, looking pretty ELM-free q_95 = 3.3 try increasing upper triangularity to increase q_95 H/(H+D) starts at 6%, rises to 10% 3.4 MW for first 150 ms, 150 kJ |
| Physics Operator Comments | |||
| May 29 2003 07:35:29:317AM | Steve Wolfe | Setting up for High Performance Run (MP#318) Plan: Engineering Setup and Run Plan for Thurs. 5/29/2003 MP#318 "High performance H-modes at 5.3 T" SL: Marmar PO: wolfe Overnight ECDC in D2 at 2e-4, bake at 60C Power Systems as on 1030528030 (including C-coil) Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) Enable the following gate valves, assuming no vacuum problems: ECE, DNB, VUV Run Plan -------- Start at 1.2MA, target density nl4~1e20, and wait for the RF guys to get the power up to 4-5MW for 0.5sec. Raise the target density to 1.6e20 in 3 steps, and evaluate the EDA/ELM behavior. Choose best (by some definition) target density and try to raise power to max available. Raise current to 1.4MA and maybe the elongation and/or triangularity. Try for neutrons. ****************************************************************************** When I first brought up PCS this morning, I got the gui but no konsole window. Quit and restarted it, and everything came up ok. Load_from 1030528030 (last shot from yesterday) Change seg2 title to indicate 1.2MA Load/cleanLoad at 29-May-2003 07:34:14.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done | |
| May 29 2003 08:02:57:327AM | Steve Wolfe | For shot 1, tweak clearin to be a little larger before 0.4 to compensate for the oh1 crossover lurch (from 0 to .005 at .428) and hold clearin constant after 1.3 sec to keep from increasing n/ncrit in rampdown (which is at 1.3 sec in this discharge). Load at 29-May-2003 08:02:21.00 | |
| May 29 2003 09:08:52:663AM | 1030529001 | Steve Wolfe | shot#1: plasma disrupted at 1.23 sec tci dropped out in mid-shot. got to 1.68kJ at .8 sec No obvious reason for disruption; there's an injection just before, but I can't see from where on the cameras. |
| May 29 2003 09:17:00:237AM | 1030529002 | Steve Wolfe | shot#2: drop pg4 from 25->23 msec fizzle. didn't drop it enough. next shot: no change |
| May 29 2003 09:48:18:383AM | 1030529003 | Steve Wolfe | shot#3: no change disrupted at 0.56sec next shot: load seg2 from 1030528030, drop pg4 to 20msec |
| May 29 2003 10:00:21:957AM | 1030529004 | Steve Wolfe | shot#4: load seg2 from 1030528030, drop pg4 to 20msec Got two factor prompts and two prompts for waveform name changed on load. There is a timestamp problem in PCS plasma full length. lots of H-modes J has max faults, d&e ragged. next shot: 5 minutes of ecdc between shots, no other changes. |
| May 29 2003 10:30:45:240AM | 1030529005 | Steve Wolfe | shot#5: 5 minutes of ecdc between shots, no other changes. init at 2.0e-6 on itg. disrupted at .80sec, got to 150kJ Can't see why it disrupts; e-port is on and sees the injection at .815, but can't tell cause from effect. next shot: reduce e-port power 20%. |
| May 29 2003 10:40:47:393AM | 1030529006 | Steve Wolfe | shot#6: 5 minutes of ecdc between shots,reduce e-port power 20%. init at 1.5e-6 plasma full length, 157kJ with 3.3MW, staying on a little better. next shot: increase upper triang. |
| May 29 2003 11:01:27:970AM | 1030529007 | Steve Wolfe | shot#7: 5 minutes of ecdc between shots; increase upper triang. rxu in by 1cm; Argon down by 5msec (at JR's request) init at 2.1e-6 on itg plasma full length. multiple h-modes. 167kJ at about 3,4MW, staying on a little better. next shot: increase triang and elongation more |
| May 29 2003 11:19:03:777AM | 1030529008 | Steve Wolfe | shot#8: 5 minutes of ecdc between shots; increase triang and elongation more zxu down by 1cm, rxu in by 1cm. init at 2.5e-6 plasma full length, lots of h-modes. 142kj next shot: raise nl4 demand to 1.0e20 |
| May 29 2003 11:45:07:393AM | 1030529009 | Steve Wolfe | shot#9: 5 minutes of ecdc between shots; raise nl4 demand to 1.0e20 rxl from .011 to 0.000 init at 2.6e-6 on igt plasma full length. multiple H-modes until 1.2sec 165 kJ in second h-mode. next shot: raise zcur from -1.5 cm to -.9cm |
| May 29 2003 12:04:15:510PM | 1030529010 | Steve Wolfe | shot#10: 5 minutes of ecdc between shots;raise zcur from -1.5 cm to -.9cm init at 2.7e-6 on igt. rf turns off power from d-port for this shot plasma full length. next shot: D will fire into dummy load. |
| May 29 2003 12:21:41:987PM | 1030529011 | Steve Wolfe | shot#11: 5 minutes of ecdc between shots; D will fire into dummy load. init at 3.0e-6 plasma full length, 3MW for awhile (E+J); 140kJ next shot: D-port back in. |
| May 29 2003 12:48:46:413PM | 1030529012 | Steve Wolfe | shot#12: 5 minutes of ecdc between shots; D into plasma again init at 3.0e-6 plasma full length, lots of h-modes; a little over 155kJ D-port is running away again. RF guys found an open door. Maybe it's related next shot: no changes |
| May 29 2003 01:08:20:907PM | 1030529013 | Steve Wolfe | shot#13: 5 minutes of ecdc between shots; long delay for access. D into plasma again init at 1.0e-6 on itg plasma full length, bounced but survived. 170kJ, d is still running away and faulting. next shot: raise nl4 demand to 1.2e20 |
| May 29 2003 01:34:20:663PM | 1030529014 | Steve Wolfe | shot#14: 5 minutes of ecdc between shots; raise nl4 demand to 1.2e20; init at 3.4e-6 plasma full length. got to 155kj still bouncing on startup next shot: repeat |
| May 29 2003 01:44:48:517PM | 1030529015 | Steve Wolfe | shot#15: 5 minutes of ecdc between shots; repeat init at 3.5e-6 plasma full length, 5 hmodes J isn't too happy, E is ok at 1.8MW, D steady at 0.5MW next shot:drop current to 1.05MA |
| May 29 2003 01:59:38:933PM | 1030529016 | Steve Wolfe | shot#16: 5 minutes of ecdc between shots;drop current to 1.05MA init at 3.2e-6 plasma full length, 2 hmodes, more eda-ish, no J-port d ran steady at 1MW, E at 1.9 next shot: repeat, hopefully with J |
| May 29 2003 02:12:30:507PM | 1030529017 | Steve Wolfe | shot#17: repeat, hopefully with J. Still ecdc between shots. init at <3.5e-6 fizzle, slow current rise. next shot: no changes |
| May 29 2003 02:35:05:013PM | 1030529018 | Steve Wolfe | shot#18: repeat, hopefully with J. no ecdc between shots this time. plasma full length. 3 h-modes. 136kj, still not getting much out of J next shot: repeat |
| May 29 2003 02:43:22:730PM | 1030529019 | Steve Wolfe | shot#19: repeat, hopefully with J. ecdc between shots this time. init at 3.5e-6 plasma full length. 2 h-modes, 135kj, still no luck on J next shot: reduce nl4 to .9e20 |
| May 29 2003 02:59:59:910PM | 1030529020 | Steve Wolfe | shot#20: reduce nl4 to 0.9e20; ecdc, init at 3.5e-6 plasma full length, multiple h-modes. target was 1.0e20 5,5MW for 90msec; got to 162kJ next shot: repeat, try to keep J on better. |
| May 29 2003 03:20:40:497PM | 1030529021 | Steve Wolfe | shot#21: repeat, try to keep J on better. ecdc, init at 3.5e-6 plasma full length, too many hmodes. 150kJ got to 6.2MW for a very short time; d overshot again, J still having trouble staying on. next shot: no changes ; try lowering J and D power a little. |
| May 29 2003 03:34:53:133PM | 1030529022 | Steve Wolfe | shot#22: no changes ; try lowering J and D power a little. ecdc, init at 3.2e-6 plasma full length; 170kj, 5MW for much of the pulse, but not steady. next shot: drop the nl4 by 1e19 |
| May 29 2003 03:52:02:720PM | 1030529023 | Steve Wolfe | shot#23: drop the nl4 to 8e19 ecdc, init at 3.5e-6 plasma full length, lots of h-modes, 150kJ in second one. J has two longer pulses, but 3 or 4 retries between them. next shot: no change |
| May 29 2003 04:13:38:600PM | 1030529024 | Steve Wolfe | shot#24: no change, long delay for a computer hang. plasma, full length, too many h-modes next shot: raise nl4 back up by 1e19 |
| May 29 2003 04:33:19:280PM | 1030529025 | Steve Wolfe | shot#25: raise nl4 back to 9e19 init at 3.5e-6 after ecdc plasma full length, 4 h-modes. five ~100msec oulses from J only 1 fault on d, none on e. next shot: increase outer gap to try to minimize loading excursion in h-modes |
| May 29 2003 04:48:20:197PM | 1030529026 | Steve Wolfe | shot#26: clearin from -.002 to +.002 init at 3.7e-6 plasma full length, 4hmodes lost a loop. bp13jk has a baseline offset of 2.3 It went in the middle of the shot, so only efit is affected. next shot: try decreasing the outer gap from previous. |
| May 29 2003 05:32:04:417PM | 1030529027 | Steve Wolfe | shot 27: clearin to -.003 plasma disrupted early .75sec not sure why, outer gap was at 3mm. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:56:38:043AM | Plasma | Ok | |
| 2 | 09:13:56:130AM | Plasma | Ok | |
| 3 | 09:36:24:073AM | Plasma | Ok | |
| 4 | 09:55:44:130AM | Plasma | Ok | |
| 5 | 10:14:16:873AM | Plasma | Ok | |
| 6 | 10:34:27:303AM | Plasma | Ok | |
| 7 | 10:54:18:880AM | Plasma | Ok | |
| 8 | 11:13:36:513AM | Plasma | Ok | |
| 9 | 11:32:00:053AM | Plasma | Ok | |
| 10 | 11:51:44:420AM | Plasma | Ok | |
| 11 | 12:09:08:100PM | Plasma | Ok | |
| 12 | 12:26:04:110PM | Plasma | Ok | |
| 13 | 01:00:54:333PM | Plasma | Ok | |
| 14 | 01:18:05:530PM | Plasma | Ok | |
| 15 | 01:34:18:943PM | Plasma | Ok | |
| 16 | 01:52:34:843PM | Plasma | Ok | |
| 17 | 02:08:59:977PM | Plasma | Ok | |
| 18 | 02:21:34:460PM | Plasma | Ok | |
| 19 | 02:37:39:543PM | Plasma | Ok | |
| 20 | 02:53:29:163PM | Plasma | Ok | |
| 21 | 03:10:00:737PM | Plasma | Ok | |
| 22 | 03:26:28:277PM | Plasma | Ok | |
| 23 | 03:42:58:207PM | Plasma | Ok | |
| 24 | 04:09:06:307PM | Plasma | Ok | |
| 25 | 04:25:19:973PM | Plasma | Ok | |
| 26 | 04:41:34:827PM | Plasma | Ok | |
| 27 | 04:56:08:023PM | Plasma | Ok | |