| Miniproposals | ||||||||||||
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| Operators | |
| Session leader(s): | John Goetz,Steve Wukitch |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Bill Parkin,Gary Dekow |
| Engineering Operator Run Comment |
| MP#268 ICRF SL: Wukitch/Goetz PO: Wolfe EO: Dekow/Parkin |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:25:133PM |
| Author: To Be Determined |
| Run summary for 1001020 This run was to determine the maximum power available from the J-port antenna. That answer today is 2.8MW. The antenna and transmitters ran well today with very few faults. The bad news is that the upper K-port corner of the J-port antenna lights up and injects stuff. The plasma would enter H-mode and some time later the injections would begin. The plasma would revert to L-mode with most shots ending in an early disruption. The threshold for this phenomenon happening was ~2.0 MW early in the run and slowly decreased to ~1.5 MW. Many things were changed to try and get rid of the glow including an outer gap scan (0.5 to 1.5 cm), a change in current, and a change in target density. None of these changes made much of a difference. It appears that this is neither a power nor a Joule heating problem. It is more than likely a voltage problem as the glow begins shortly after the plasma enters H-mode (when the voltage on the antenna is highest). Upon investigating the history of this problem, it appears that the glow begins on the upper K-side corner of the antenna beginning with shot 1001018021. Every shot today had a glow in that corner to varying degrees. The shots are as follows: Shot 001 cycle test Shot 002 plasma J-port tuned for L-mode; max faults early Shot 003 plasma J-port ran a little longer; tune was o.k. Shot 004 fizzle Shot 005 plasma J3 - 0.8MW - one fault J4 - 0.9MW - nine faults (mostly DC0) Shot 006 data corrupted Shot 007 plasma, H-mode at 1.3MW - early disruption J3 - 1.0MW - no faults J4 - 1.0MW - one fault K-port top corner of the antenna is exploding to cause the disruption Shot 008 plasma, H-mode at 1.3MW - early disruption J3 - 1.0MW - no faults J4 - 1.0MW - one fault K-port top corner of the antenna is exploding to cause the disruption Shot 009 plasma, H-mode at 1.1MW - early disruption J3 - ramp from 0.4 to 0.9MW - no faults J4 - ramp from 0.4 to 0.9MW - no faults K-port top corner of the antenna is exploding to cause the disruption injections begin to happen at about 1.8MW net power power level for injections is decreasing as the shots go along Shot 010 plasma, H-mode at 1.1MW - outer gap ~1.5cm J3 - ramp from 0.4 to 1.3MW - one faults J4 - ramp from 0.4 to 1.4MW - max faults at the high power K-port top corner of the antenna has a "small" injection on this one Shot 011 plasma, H-mode at 1.1MW - outer gap ~1.5cm injection from K-port top causes a MARFE and an early disruption J3 - ramp from 0.4 to 1 MW - four faults during the MARFE J4 - ramp from 0.4 to 1 MW - three faults during the MARFE Shot 012 plasma, H-mode at 1.1MW - outer gap ~1.5cm - plasma moved down 0.5cm no cameras to help find the injection J3 - ramp from 0.4 to 1.1 MW - no faults J4 - ramp from 0.4 to 1.1 MW - no faults Shot 013 early disruption - RF didn't have a chance Shot 014 plasma - all the way right gap is about 0.5cm many injections at 2 MW of power puts it into L-mode and then it alternates injections seem to be coming from the top K-port corner of the antenna J3 - 0.4 to 1.4 MW ramp - three faults J4 - 0.4 to 1.4 MW ramp - three faults Shot 015 plasma - H-mode right gap is about 0.5cm many injections at 2 MW of power puts it into L-mode and then it alternates injections seem to be coming from the top K-port corner of the antenna J3 - 0.4 to 1.4 MW ramp - one fault J4 - 0.4 to 1.4 MW ramp - no faults Shot 016 plasma - H-mode right gap is about 0.5cm many injections at 1.9 MW of power puts it into L-mode injections seem to be coming from the top K-port corner of the antenna J3 - 0.95 MW ramp - no faults J4 - 0.95 MW ramp - no faults Shot 017 plasma - H-mode many injection at 1.6 MW of power puts it into L-mode injections from top K-port corner of antenna J3 - 0.8 MW - no faults J4 - 0.8 MW - no faults Shot 018 plasma - H-mode - Ip = 1 MA right gap is about 0.5cm many injections at 1.6 MW (0.8 each) of power puts it into L-mode injections seem to be coming from the top K-port corner of the antenna J3 - 0.9 MW ramp - two faults J4 - 0.9 MW ramp - two faults Shot 019 plasma - H-mode - Ip = 1.1 MA - target ne = 0.8 right gap is about 0.5cm many injections at 1.5 MW injections seem to be coming from the top K-port corner of the antenna J3 - 0.9 MW ramp - no faults J4 - 1.0 MW ramp - no faults |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:12:550PM |
| Author: To Be Determined |
| Physics Operator Summary for Friday, Oct 20, 2000 MP#268 ICRF SL: Wukitch/Goetz PO: Wolfe EO: Dekow, Parkin Engineering Setup ------------------ Overnight boronization, followed by ECDC in He until 2 hours before start of run. Power systems as on 1001018021 Note: EF4 current limit should be [-10,+4]ka EFC start time should be -.035sec Gas setup fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid enabled fill B-side upper with 35 psi of D2 Hybrid DISABLED, for ECDC fill C-side with 30 psi of D2 Hybrid enabled fill J-bot with 10 psi of N2 Hybrid DISABLED fill Lower Div Cap with 10 psi of N2 The following gate valves should be enabled: ECE, VUV, Beast Plan -------------------- The idea is to investigate the power limit (voltage or heat load) for the four-strap J-port antenna into H-modes, and then perhaps add additional power from D and E. If possible, we would like to couple 2.5-3.0MW through the J antenna. We will also try using nitrogen puffing, from either J-bottom or NINJA or both, to cool the edge and reduce the impurity influx at high power. Start from 1001018021 (1.1MA, 5.4T, nl04=1.1e20) target, slightly tweaked to get rid of thrash at 0.5sec, using only J-port antenna. Try adjusting gap, field, and perhaps current to reduce faulting on real or spurious arcs. We can also change the outer plasma shape relative to the antenna by varying the programmed IC_EF4 current; lowering IC_EF4 should result in a closer match at the top and bottom of the antenna. Also try modifying the power feedback circuit to reduce sawtooth-induced "faults". We will also try using N2 puffing into the divertor to reduce Prad (cf MP#163, run 980213). We can try both programmed puffs and even perhaps bolo-feedback. Note that at the moment, only DIVBOLO1 seems to be hooked up to the hybrid. Results: ----------- We got off to a late start, due to problems with the PLC/PC system. First the PC's lost communication, apparently due to a flakey BNC connector on the ethernet connection to either EF3 or TMX PC's. Then STATE refused to reboot, and Joe had to swap in a new PC. Then it took quite a while to setup the new one. Since the new unit did not include the card for communication with the BigBoard, we ran without that today. The first plasma shot was #2, which was based on 1001018021, as noted in the run plan. I set up a bolofeed wire, but it was left off. J-port was the source of the plasma terminating injections today, with the upper K-side corner lighting up when the power got to ~2MW. It behaved basically the same all day, perhaps getting a little worse later on, when the injections started happening closer to 1.6MW. We were unable to find a plasma condition that improved the injection situation. Outer gap was scanned from .5 to 1.5cm, zcur was lowered to -.02 and raised to .013, current was dropped back to 1.0MA, density was dropped from 1.1e20 to 0.8e20. Only a few shots made it through to rampdown, and even those had injections from j-port that killed the h-mode when the power got to the neighborhood of 2MW. This run was unsuccessful. The offset on the bolofeed channel was determined to be -.07, for what it's worth. We never tried the N2 puff because the injections were all local to the antenna today, not from the divertor. There were no startup problems associated with the boronization, as had been feared. We had only one fizzle, and that was probably as much a disruption effect as anything else. No startup tweaks were made. On the other hand, the H/D ratio was not that great, getting up to 0.08 or so during RF. Shot #3 disrupted at the beginning of rampdown, with the RF off.FOr the rest of the run, I removed the RCUR and CLEARIN ramps after 1.5sec, and had no further rampdown disruptions (of the shots that made it the far). Scorecard --------- Tests 1 Duds 0 Fizzles 1 Plasmas 17 (one pre-rf disruption) ------ -- Shots 19 |
| Session Leader Comments | |||
| Oct 20 2000 11:41:55:357AM | 1001020001 | John Goetz | cycle test |
| Oct 20 2000 11:20:28:560AM | 1001020002 | Steve Wukitch | 002 request: BT=5.4 T, Ip=1.1 MA D: 0.75 MW [1.1,1.5] E: 0.75 MW [1.1,1.5] J3: 0.75 MW [0.6,1.5] J4: 0.75 MW [0.6,1.5] result: plasma, L-mode D: 0. MW [1.1,1.5] E: 0. MW [1.1,1.5] J3: 0.75 MW [0.6,1.5] max faults J4: 0.75 MW [0.6,1.5] max faults |
| Oct 20 2000 11:42:21:937AM | 1001020002 | John Goetz | Shot 002 plasma J-port tuned for L-mode; max faults early |
| Oct 20 2000 11:46:05:607AM | 1001020003 | John Goetz | Shot 003 tune up J-port plasma J-port ran a little longer; tune was o.k. |
| Oct 20 2000 12:20:00:640PM | 1001020004 | John Goetz | Shot 004 fizzle |
| Oct 20 2000 12:25:13:670PM | 1001020005 | John Goetz | Shot 005 try again plasma J3 - 0.8MW - one fault J4 - 0.9MW - nine faults (mostly DC0) |
| Oct 20 2000 02:08:34:360PM | 1001020006 | John Goetz | Shot 006 plasma, H-mode at 1.1MW - outer gap ~1.5cm J3 - 1 MW J4 - 1 MW |
| Oct 20 2000 01:17:02:327PM | 1001020007 | John Goetz | Shot 007 plasma, H-mode at 1.3MW - early disruption J3 - 1.0MW - no faults J4 - 1.0MW - one fault K-port to corner of the antenna is exploding to cause the disruption |
| Oct 20 2000 01:27:30:360PM | 1001020008 | John Goetz | Shot 008 plasma, H-mode at 1.3MW - early disruption J3 - 1.0MW - no faults J4 - 1.0MW - one fault K-port to corner of the antenna is exploding to cause the disruption |
| Oct 20 2000 01:45:13:263PM | 1001020009 | John Goetz | Shot 009 plasma, H-mode at 1.1MW - early disruption J3 - ramp from 0.4 to 0.9MW - no faults J4 - ramp from 0.4 to 0.9MW - no faults K-port top corner of the antenna is exploding to cause the disruption injections begin to happen at about 1.8MW net power power level for injections is decreasing as the shots go along |
| Oct 20 2000 02:09:14:857PM | 1001020010 | John Goetz | Shot 010 plasma, H-mode at 1.1MW - outer gap ~1.5cm J3 - ramp from 0.4 to 1.3MW - one faults J4 - ramp from 0.4 to 1.4MW - max faults at the high power K-port top corner of the antenna has a "small" injection on this one |
| Oct 20 2000 02:29:08:543PM | 1001020011 | John Goetz | Shot 011 plasma, H-mode at 1.1MW - outer gap ~1.5cm injection from K-port top causes a MARFE and an early disruption J3 - ramp from 0.4 to 1 MW - four faults during the MARFE J4 - ramp from 0.4 to 1 MW - three faults during the MARFE |
| Oct 20 2000 02:47:14:200PM | 1001020012 | John Goetz | Shot 012 plasma, H-mode at 1.1MW - outer gap ~1.5cm - plasma moved down 0.5cm no cameras to help find the injection J3 - ramp from 0.4 to 1.1 MW - no faults J4 - ramp from 0.4 to 1.1 MW - no faults |
| Oct 20 2000 03:11:27:030PM | 1001020013 | John Goetz | Shot 013 early disruption - RF didn't have a chance |
| Oct 20 2000 03:29:40:343PM | 1001020014 | John Goetz | Shot 014 plasma - all the way right gap is about 0.5cm many injections at 2 MW of power puts it into L-mode and then it alternates injections seem to be coming from the top K-port corner of the antenna J3 - 0.4 to 1.4 MW ramp - three faults J4 - 0.4 to 1.4 MW ramp - three faults |
| Oct 20 2000 03:48:07:107PM | 1001020015 | John Goetz | Shot 015 plasma - H-mode right gap is about 0.5cm many injections at 2 MW of power puts it into L-mode and then it alternates injections seem to be coming from the top K-port corner of the antenna J3 - 0.4 to 1.4 MW ramp - one fault J4 - 0.4 to 1.4 MW ramp - no faults |
| Oct 20 2000 04:10:57:357PM | 1001020016 | John Goetz | Shot 016 plasma - H-mode right gap is about 0.5cm many injections at 1.9 MW of power puts it into L-mode and then it alternates injections seem to be coming from the top K-port corner of the antenna J3 - 0.95 MW ramp - no faults J4 - 0.95 MW ramp - no faults |
| Oct 20 2000 04:44:44:403PM | 1001020018 | John Goetz | Shot 018 plasma - H-mode - Ip = 1 MA right gap is about 0.5cm many injections at 1.6 MW (0.8 each) of power puts it into L-mode injections seem to be coming from the top K-port corner of the antenna J3 - 0.9 MW ramp - two faults J4 - 0.9 MW ramp - two faults |
| Oct 20 2000 05:15:34:700PM | 1001020019 | John Goetz | Shot 019 plasma - H-mode - Ip = 1.1 MA - target ne = 0.8 right gap is about 0.5cm many injections at 1.5 MW injections seem to be coming from the top K-port corner of the antenna J3 - 0.9 MW ramp - no faults J4 - 1.0 MW ramp - no faults |
| Physics Operator Comments | |||
| Oct 19 2000 05:17:38:637PM | Steve Wolfe | Load starting shot, also stored in PCS$WOLFE:pcs_1001020000 Seg 1 from 1001019022 Seg 2 from 1001918021 with Ip gain switch delayed from .5 to .65sec | |
| Oct 19 2000 05:18:55:200PM | Steve Wolfe | Run Plan for Friday, Oct 20, 2000 MP#268 ICRF SL: Wukitch/Goetz PO: Wolfe Engineering Setup ------------------ Overnight boronization, followed by ECDC in He until 2 hours before start of run. Power systems as on 1001018021 Note: EF4 current limit should be [-10,+4]ka EFC start time should be -.035sec Gas setup fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid enabled fill B-side upper with 35 psi of D2 Hybrid DISABLED, for ECDC fill C-side with 30 psi of D2 Hybrid enabled fill J-bot with 10 psi of N2 Hybrid DISABLED fill Lower Div Cap with 10 psi of N2 The following gate valves should be enabled: ECE, VUV, Beast Plan -------------------- The idea is to investigate the power limit (voltage or heat load) for the four-strap J-port antenna into H-modes, and then perhaps add additional power from D and E. If possible, we would like to couple 2.5-3.0MW through the J antenna. We will also try using nitrogen puffing, from either J-bottom or NINJA or both, to cool the edge and reduce the impurity influx at high power. Start from 1001018021 (1.1MA, 5.4T, nl04=1.1e20) target, slightly tweaked to get rid of thrash at 0.5sec, using only J-port antenna. Try adjusting gap, field, and perhaps current to reduce faulting on real or spurious arcs. We can also change the outer plasma shape relative to the antenna by varying the programmed IC_EF4 current; lowering IC_EF4 should result in a closer match at the top and bottom of the antenna. Also try modifying the power feedback circuit to reduce sawtooth-induced "faults". We will also try using N2 puffing into the divertor to reduce Prad (cf MP#163, run 980213). We can try both programmed puffs and even perhaps bolo-feedback. Note that at the moment, only DIVBOLO1 seems to be hooked up to the hybrid. | |
| Oct 20 2000 07:18:49:827AM | Steve Wolfe | coldstart at 7:15AM no errors, all matrices respond. | |
| Oct 20 2000 10:59:59:733AM | 1001020001 | Steve Wolfe | shot#1:in seg2, change ref#9-12 from Ip to 10V change wire 9 to "bolofeed" with custom predictor: divbolo1=1.0,factor = 2.0 edit controler for pg5=10., algorithm left blank. gains=0.0 zero_all for wires 10-12. Also change title to 1.1MA..., and fix tf_current trace before 0.1sec to -150000. Load at 20-Oct-2000 07:44:02.00 We will have a delay due to a PC/PLC problem: lost heartbeats on PC's, apparently due to a flakey ethernet connection at EF3 or TMX system. State still won't reboot, claiming CMOS not set. Joe swapped pc's, no bigboard but state should function. Shot#1 will be a no-power cycle to test the new STATE machine, etc. Seemed to go ok. Next shot, try for plasma. |
| Oct 20 2000 11:19:29:543AM | 1001020002 | Steve Wolfe | shot#2: PCS setup as in entry for shot#1. plasma, full length. multiple faulting on J-port. |
| Oct 20 2000 11:47:45:030AM | 1001020003 | Steve Wolfe | shot#3: repeat, hopefully with rf. plasma, disrupts at 1.5sec. ELM-free h-mode, j still has faulting. start-up is dicey; it hits something at 12msec, but keeps on going. next shot: leave rcur and clearin out during rampdown. |
| Oct 20 2000 12:07:05:610PM | 1001020004 | Steve Wolfe | shot#4: leave rcur and clearin out during rampdown. fizzle. probably just the disruption residue; fields look fine, but it chokes. next shot: repeat. |
| Oct 20 2000 12:28:07:937PM | 1001020005 | Steve Wolfe | shot#5: leave rcur and clearin out during rampdown. plasma, full length, h-modes; 115kJ, 1e13 neut/sec J gives 1.7MW, a few faults. H/D~0.06 |
| Oct 20 2000 01:00:04:827PM | 1001020006 | Steve Wolfe | shot#6: repeat, try for more power. plasma disrupted at ~1.2sec. during 2nd H-mode. |
| Oct 20 2000 01:11:22:530PM | 1001020007 | Steve Wolfe | shot#7: repeat, disrupted at 1.06sec. RF gets to 1.9MW, one fault. eda h-mode, 1e13n/sec, 120kJ. MPEG shows upper left corner of J-antenna as the source of the injections. next shot: shorten the RF pulse. |
| Oct 20 2000 01:27:27:953PM | 1001020008 | Steve Wolfe | shot#8: shorten the RF pulse. disrupted at 0.75sec, at ~2MW from J corner again. |
| Oct 20 2000 01:46:19:340PM | 1001020009 | Steve Wolfe | shot#9: long power ramp to 3MW, see where it dies. disrupts at 1.02sec, 1.8MW on J next shot: increase outer gap by 5mm. |
| Oct 20 2000 02:00:46:233PM | 1001020010 | Steve Wolfe | shot#10: increase outer gap by 5mm. RCUR from .661 to .6585 plasma, full length. j-faulted at about the 2MW level. lots of injections, three separate h-modes. |
| Oct 20 2000 02:26:15:840PM | 1001020011 | Steve Wolfe | shot#11: repeat. plasma disrupts at 1.06sec, right at 2MW. next shot: lower the plasma by 5mm. |
| Oct 20 2000 02:49:46:233PM | 1001020012 | Steve Wolfe | shot#12: lower the plasma by 5mm. (zcur to -.02) plasma, disrupts at 1.13sec. It's not a bad EDA until it suicides. 136kJ, Rn>2e13, J gets right to 2MW. No mpegs ahow up this time, so I can't tell if it comes from the same place. next shot: move it back up and out by 1cm |
| Oct 20 2000 03:07:52:437PM | 1001020013 | Steve Wolfe | shot#13: move it back up and out by 1cm (rcur ->.6635, zcur->-.015) disrupts very early, .39sec? I didn't change it that early. Big injection at .35sec, maybe from the divertor in front of J again? next shot: try that again, |
| Oct 20 2000 03:24:32:123PM | 1001020014 | Steve Wolfe | shot#14: move it back up, and out by 1cm (rcur ->.6635, zcur->-.015) plasma, full length, h-modes "here and there " neuts to 2e13, 133kJ, lots of injections after 1.1sec, but rf stays on to 2.6MW before tripping out. gap at 5mm. next shot: up by 2mm |
| Oct 20 2000 03:44:42:467PM | 1001020015 | Steve Wolfe | shot#15: up by 2mm (zcur-> -.013); also change offset on bolofeed to .07 plasma, disrupts at 1.44sec, very similar injections. It starts to spark when it gets to 2MW. next shot: reduce power to 1.9 and see if it will stay quiet. |
| Oct 20 2000 04:05:21:030PM | 1001020016 | Steve Wolfe | shot#16: reduce power to 1.9 and see if it will stay quiet. also, change bolofeed offset to -.07 (went the wrong way) plasma disrupts at .89 sec, out of h-mode at .8 next shot: drop power to 1.8MW |
| Oct 20 2000 04:20:03:577PM | 1001020017 | Steve Wolfe | shot#17: : drop power to 1.8MW disrupts at 0.9sec, RF at 1.65MW. next shot: back to the long power ramp and drop current to 1.0MA |
| Oct 20 2000 04:43:17:560PM | 1001020018 | Steve Wolfe | shot#18: back to the long power ramp and drop current to 1.0MA disrupts at 1.05sec, out of H-mode at 0.92sec, P=1.6MW. So it doesn't seem to be the q or the Ip. next shot: back to 1.1MA, lower nl04 to .8e20 |
| Oct 20 2000 05:05:03:827PM | 1001020019 | Steve Wolfe | shot#19: back to 1.1MA, lower nl04 to .8e20 disrupts at 1.09sec, out of h-mode at .92sec, just the same. g-side pressure down to 0.1mTorr; it doesn't care about that either. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 10:53:52:590AM | Test | Ok | No Power Test to Check State |
| 2 | 11:12:50:780AM | Plasma | Ok | |
| 3 | 11:38:29:123AM | Plasma | Ok | |
| 4 | 12:02:12:420PM | Plasma | Ok | |
| 5 | 12:17:13:873PM | Plasma | Ok | |
| 6 | 12:37:11:840PM | Plasma | Ok | |
| 7 | 12:58:24:513PM | Plasma | Ok | |
| 8 | 01:20:31:623PM | Plasma | Ok | |
| 9 | 01:37:21:217PM | Plasma | Ok | |
| 10 | 01:55:23:747PM | Plasma | Ok | |
| 11 | 02:19:16:280PM | Plasma | Ok | |
| 12 | 02:36:44:077PM | Plasma | Ok | |
| 13 | 02:59:39:467PM | Plasma | Ok | |
| 14 | 03:16:18:310PM | Plasma | Ok | |
| 15 | 03:38:41:187PM | Plasma | Ok | |
| 16 | 04:00:33:780PM | Plasma | Ok | |
| 17 | 04:14:17:733PM | Plasma | Ok | |
| 18 | 04:36:58:263PM | Plasma | Ok | |
| 19 | 04:58:08:263PM | Plasma | Ok | |