| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Yijun Lin |
| Physics operator(s): | |
| Engineering operator(s): | Bill Cochran,Bill Byford,Bill Parkin |
| Engineering Operator Run Comment |
| MP#417, Post 2nd-Boronization |
| Session Leader Plans |
| Entered: Apr 26 2005 09:35:48:067AM |
| Author: Yijun Lin |
| SL plan: 1050426
MP417, post 2nd-boronization Run starts at 10:45 am. Fiducial plasma at 1 MA (load 1050422003) Starts with post-boronization recovery. RF conditioning until clean 3 MW available. RF waveform: [0.7-0.85] sec, 0.6 MW [0.85, 1.2] sec, 0.6 ramping up to 2 MW [1.2, 1.5] sec, constant 3 MW 1 shot: same RF waveform. Gate valves closed. (fiducial discharge) 3 shots: Performance at RF power scan. RF power at 1, 2, 3, 4 MW. (1 MW and 2 MW can be done in the same shot) 7 shots: Performance vs density. Density scan nl04 = 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, and 1.4e20 m^-2 at 3 MW RF power. 2 shots: 0.8 MA, reload 1050421016. Density scan 0.8 and 1.0e20 m^2 2 shots: puff D2 in H-mode (same as in shot 1050422026). Choose the nl04 with the best performance. 1 shot: puff D2 in L-mode (RF power below L-H threshold) 2 shots: puff N2 in divertor (same as shot 1050422025, 11 PSI in Ninja. puff 0.2 sec and 0.4 sec). 1 shot: puff N2 in L-mode (RF power below L-H threshold) If both D2 and N2 puff show enhancement on plasma performance, then 2 shot: puff both N2 and D2. 2 shots: 1.2 MA, (reload shot 1050420032) Density scan 1.2 and 1.4e20 m^2, 3MW. 1 shot: 1.2 MA, 4 MW. |
| Physics Operators Plans |
| Entered: Apr 25 2005 06:08:17:103PM |
| Author: Robert Granetz |
| Engineering setup for Tuesday, 26 Apr 2005 MP 417: Performance comparisons (post 2nd boronization) Session leader: Y. Lin Physics operator: R. Granetz Boronize overnight, followed by 2+ hours of ECDC in D2; bake at 60 C. Run begins at 10:45 and ends at 17:00. Power systems as on 1050422003 (1 MA, 5.4 T fiducial plasma) 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 2 psi Ar Hybrid enabled (PG1) leave B-side upper with whatever Hybrid disabled fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) fill NINJA with 8 psi N2 Leave disabled to begin with Torvac setup: machine gate valves to remain open during and after shot. (I need to reconfirm this in the morning before the run begins.) Enable the following gate valves, assuming no vacuum problems: ECE, VUV, Z-bolo shutters Necessary diagnostics: Core/confinement incl. bolometry, pedestal profiles, H/D, boron and molybdenum monitoring ------------------------------------------------------------------------------- ICRF Setup: All transmitters in run on at 10:15. ------------------------------------------------------------------------------- Run plan: Start with shot 1050422003 (1 MA, 5.4 T fiducial plasma) (1) Post-boronization recovery and ICRF conditioning (2) RF power ramp (H-mode threshold) (3) RF power scan (2, 3, 4 MW) (4) Density scan at Prf = 3 MW Some D2 and N2 puffing will be done in part (4) (5) 0.8 MA, two densities, 3 MW (6) 1.2 MA, two densities, 3 MW (7) 1.2 MA, 4 MW |
| Session Leader Summaries |
| Entered: Apr 27 2005 03:30:49:440PM |
| Author: Yijun Lin |
| SL summary:
-------------- We had a new record C-Mod shot today, 1050426022: Wtot (efit) = 0.250 MJ Volume = .918 m3 Averaged P = 1.80 atmosphere (World tokamak record?) 2*P_e(0) [Thomson scattering] = 5.1 Atmosphere T_e(0) ~ 4.4 keV n_e(0) ~ 4.3e20 m^-3 I_p = 1.06 MA D-D fusion reaction rate (2*neutron rate) ~ 5e14/second (but needs checking; a lot of the neutron signals are saturated) P_RF = 5 MW beta_N ~ 1.73 Z_eff ~ 1.4 ------------------------- The Mo level and Prad in this run are much lower than that in 1050420. The boronization was done over all the outer wall and antenna structure. H/D level is at 3-4% all day. Shot 1 got H-mode with only 0.4 MW RF power. At this clean machine condition, puffing argon seems to have significant effect on performance (shot 9 and 10). The H-mode becomes more ELM-free like and the stored energy is lower. Puffing D2 in H-mode also keeps the stored energy to stay constant. Shot 16 without puff, shot 22 with puff. N2 was puffed on shot 23. The first H-mode with N2 went to ELM-free like. It is too complicated to tell whether N2 helped. ------------------------- An alternator problem terminated the run (bearing vibration alarm tripped). |
| Physics Operator Summaries |
| Entered: Apr 27 2005 03:15:47:753PM |
| Author: Robert Granetz |
| Physop summary for Tuesday 26 April 2005: MP 417: Plasma performance, boronization, ICRF with all metal The machine ran well today, the first day after boronization (and helium ECDC and D2 ECDC). We achieved record stored energy (1050426022 had 250 kJ) with 5 MW of ICRF. We were basically running a 1 MA, 5.4 T, lower single null fiducial all day, while varying RF power, gate valve status, and D2 and N2 gas puffs. H/(H+D) was low all day (3-4%), as was Zeff (1-1.3). It looks like this boronization worked much better than the previous one. (This boronization went all the way out to the outer wall.) Keeping the gate valves closed during and after the shots seemed to result in increased chance of fizzles. Also, it was pretty clear that the confinement was significantly degraded by argon puffing on the two shots that we tried it (09 and 10). Note that the run started late due to a visitation by a VIP, and extended discharge cleaning after the boronization. Also, shot 20 was a no-power shot cycle because an alternator alarm occurred due to excessive bearing vibration. This same problem prevented us from taking the last shot of the day Scorecard: 16 plasmas 5 fizzles 1 dud 1 tests or no-power shot cycles 0 beam-into-gas calibration shots with B-field(s) ---------- 23 total shot cycles |
| Session Leader Comments | |||
| Apr 26 2005 11:15:08:003AM | 1050426001 | Yijun Lin | shot 1: (post-boronization recovery) (load 1050422003)
Request: 1 MA, 5.4 T, nl = 0.9e20 m^-2. RF power ramping up from 0.6 MW to 3 MW. Gate valves closed for 5 minutes for wall pumping study Result: Plasma. H-mode, H mode transition at 0.4 MW RF power (really low). No power from D nor E because of a CAMAC problem. No cell data for all antennas because of a CPCI problem. 98 kJ at 0.7 MW power. H/D 2-3% Next: repeat. hopefully with all antenna power. |
| Apr 26 2005 11:42:47:220AM | 1050426002 | Yijun Lin | fizzle |
| Apr 26 2005 12:05:43:987PM | 1050426003 | Yijun Lin | shot 3: (RF conditioning)
Request: 1 MA, 5.4 T, nl = 0.9e20 m^-2. RF power ramping up from 0.6 MW to 3 MW. Gate valves closed for 5 minutes for wall pumping study Result: plasma. H-mode. Excellent shot. L-H transition at 0.8 MW Prf W = 139 kJ at Prf = 2 MW at 1.19 sec. Pradmain = 0.4 MW W = 115 kJ at Prf = 1.5 MW at 1.3 sec. Prad main = 0.9 MW W = 148 kJ at Prf = 3 MW at 1.22 sec. Prad main = 1.8 MW (A lot more radiation here). H/D 3.6% (It is higher than shot 1) Next repeat. |
| Apr 26 2005 12:52:57:580PM | 1050426004 | Yijun Lin | shot 4: (RF conditioning)
Request: 1 MA, 5.4 T, nl = 0.9e20 m^-2. RF power ramping up from 0.6 MW to 3 MW. Gate valves are open Result: plasma. H-mode. Excellent shot. L-H transition at 0.8 MW Prf H/D 3.6% (It is higher than shot 1) Next repeat. |
| Apr 26 2005 12:52:44:127PM | 1050426005 | Yijun Lin | shot 5: (RF conditioning)
Request: 1 MA, 5.4 T, nl = 0.9e20 m^-2. RF power ramping up from 0.6 MW to 3 MW. Gate valves are open Result: plasma. H-mode. L-H transition at 0.8 MW Prf H/D 3.% W 153 kJ at 3 MW at 1.4 sec. Two injections at 1.06 and 1.2 sec. Next Raise RF power to 4 MW late in the shot for further conditioning. |
| Apr 26 2005 12:56:20:190PM | 1050426006 | Yijun Lin | shot 6: (RF conditioning)
Request: 1 MA, 5.4 T, nl = 0.9e20 m^-2. RF power ramping up from 0.6 MW to 2 MW, then to 4 MW Result: plasma. H-mode. J-port was not able to run due to high neutral pressure. L-H transition at 0.5 MW Prf H/D 3.% W 157 kJ at 2 MW at 1.4 sec. Prad = 0.5 MW. H89 = 1.7 and rising. Next repeat. |
| Apr 26 2005 01:08:49:533PM | 1050426007 | Yijun Lin | shot 7: (RF conditioning)
Request: 1 MA, 5.4 T, nl = 0.9e20 m^-2. RF power ramping up from 0.6 MW to 2 MW, then to 4 MW Result: plasma. H-mode. L-H transition at 0.7 MW Prf H/D 3.5% W 192 kJ at 4 MW at 1.4 sec. H89 = 1.3-1.6 for whole H-mode. Next RF 1 MW and 2 MW. |
| Apr 26 2005 01:12:05:893PM | 1050426008 | Yijun Lin | fizzle |
| Apr 26 2005 01:33:48:987PM | 1050426009 | Yijun Lin | shot 9: (RF power scan)
Request: 1 MA, 5.4 T, nl = 0.9e20 m^-2. RF power 1 MW and 2 MW Result: plasma. H-mode. H/D 3.5% got H-mode at 1 MW, but not at 2 MW (How come?) W at 98 kJ at 1 MW. Next swap the order of 1 MW and 2 MW. |
| Apr 26 2005 01:45:22:470PM | 1050426010 | Yijun Lin | shot 10: (RF power scan)
Request: 1 MA, 5.4 T, nl = 0.9e20 m^-2. RF power 2 MW and 1 MW Result: plasma. H-mode. H/D ~3% W at 110 kJ at 2 MW. It took a long time to get into H-mode and it is ELM-free like (Ar was puffed in shot 9 and 10. Is it the cause? next: 2 MW and 3 MW. No Ar puff. |
| Apr 26 2005 02:16:54:300PM | 1050426011 | Yijun Lin | shot 11: (RF power scan)
Request: 1 MA, 5.4 T, nl = 0.9e20 m^-2. RF power 2 MW and 3 MW (got 2 and 1.6) Result: plasma. H-mode. H/D ~3% W at 140 kJ at 2 MW. Now the H-mode is more EDA like. The 2nd RF pulse only goes to 1.6 MW, No H-mode (why? density gradient not relaxed to the same condition?) Comparing shot 11 and 10, it seems that Ar does matter and the plasma behavior is very very sensitive to it. next: repeat. No Ar puff. Separate the two RF pulse by 200 ms instead of 100 ms. |
| Apr 26 2005 02:18:02:067PM | 1050426012 | Yijun Lin | shot 12: (RF power scan)
Request: 1 MA, 5.4 T, nl = 0.9e20 m^-2. RF power 2 MW and 3 MW Result: plasma. H-mode. H/D ~3% W at 140 kJ at 2 MW. 173 kJ at 3 MW. next: 3 MW and 4 MW. No Ar puff. Gate valves closed. |
| Apr 26 2005 02:45:19:050PM | 1050426014 | Yijun Lin | shot 14: (RF power scan)
Request: 1 MA, 5.4 T, nl = 0.9e20 m^-2. RF power 3 MW and 4 MW Result: plasma. H-mode. H/D ~3% W at 173 kJ at 3 MW. 226 kJ at 4 MW. (Since there is not a lot time left, i would like to start D2/N2 puff) Next: constant 3 MW with a jump to 4 MW in the end of RF pulse. Same plasma. |
| Apr 26 2005 02:47:58:237PM | 1050426015 | Yijun Lin | fizzle |
| Apr 26 2005 03:17:32:330PM | 1050426017 | Yijun Lin | dud |
| Apr 26 2005 03:37:34:670PM | 1050426018 | Yijun Lin | shot 18:
(D2 puff at 60V on PG3) Request: 1 MA, 5.4 T, nl = 0.9e20 m^-2. RF power 3 MW, 4 MW and 5 MW. Result: plasma. 2 H-modes H/D 3.5-4% Wmhd at 165 kJ at 3 MW. (A big injection at 0.9 sec and killed the first H-mode) 220 kJ at 4 MW. Prad main at 1 MW (significantly lower than shot 16) (Was the D2 puff that saved the plasma and pushed it back to good performance?) Next: repeat |
| Apr 26 2005 03:42:29:670PM | 1050426019 | Yijun Lin | fizzle |
| Apr 26 2005 04:00:58:700PM | 1050426020 | Yijun Lin | shot 20: No power shot. Alternator problem. |
| Apr 26 2005 04:36:27:997PM | 1050426021 | Yijun Lin | shot 21:
(D2 puff at 60V on PG3) Request: 1 MA, 5.4 T, nl = 0.9e20 m^-2. RF power 3 MW, 4 MW and 5 MW. Result: plasma. H-mode. H/D ~4% Wmhd at 180 kJ at 3 MW. 1 MW Prad_main 202 kJ at 4 MW. 1-1.4 MW Prad_main 238 kJ at 5.1 MW (record Wmhd in C-Mod) Wmhd was rising all the way in the 2nd H-mode. Possibly an injection killed the first H-mode. |
| Apr 26 2005 04:46:35:370PM | 1050426022 | Yijun Lin | shot 22, repeat.
(D2 puff at 60V on PG3) Request: 1 MA, 5.4 T, nl = 0.9e20 m^-2. RF power 3 MW, 4 MW and 5 MW. Result: plasma. H-mode. H/D ~4% Wmhd at 172 kJ at 3 MW. 1 MW Prad_main 220 kJ at 4 MW. 1-1.4 MW Prad_main, Prad_main 1.4 MW. 249.7 kJ at 5. MW (another record Wmhd in C-Mod) Prad_main 1.5 MW. A perfect shot. Next: Do N2 puff. (starting from 0.65 sec for 300 ms) |
| Physics Operator Comments | |||
| Apr 26 2005 10:48:42:470AM | Robert Granetz | GV1 will be disabled so that it can not open until mass 18 goes down. (Due to change of RGA filament last night and subsequent baking of stack.) | |
| Apr 26 2005 10:57:24:893AM | Robert Granetz | Date: Tue, 26 Apr 2005 10:24:00 -0400 From: Amanda Hubbard To: Robert S. Granetz Subject: ECE today Bob, Yijun, I have to go to a medical appt shortly. Just to let you know, there is some uncertainty about the state of GPC; it is low on helium and I can't fill it. So, it may or may not give signals. GPC2 and Michelson should be OK. back about noon, Amanda | |
| Apr 26 2005 11:18:00:283AM | 1050426001 | Robert Granetz | Plasma. Good shot. No problems with boronization recovery, apparently. Due to some problem with the RF camac control signals, D and E didn't fire. J fired up to 1 MW. There was an EDA H-mode, but Wpla didn't even reach 100 kJ. H/D=2-3%. H-mode threshold was an incredibly low 0.4 MW ! Gate valves were kept closed for 5 minutes after the shot (after much discussion among Bruce and Yijun this morning). Cell access required after the shot to fix RF CPCI. Next shot: no PCS changes. Gate valves will remain closed again. |
| Apr 26 2005 11:42:33:597AM | 1050426002 | Robert Granetz | Fizzle. Next shot: decrease pre-fill puff by 2 ms. |
| Apr 26 2005 12:15:51:317PM | 1050426003 | Robert Granetz | Plasma. Good shot. Prf peaks at 2.9 MW briefly. L/H transition is around 0.7 MW. There are a bunch of impurity injections (similar to shot 01). H/(H+D) = 3-3.5% Gate valve remained closed after this shot. Next shot: no PCS changes. Gate valve will be OPEN after the shot. |
| Apr 26 2005 12:37:23:567PM | 1050426004 | Robert Granetz | Plasma. Good shot. Max Prf = approx 2 MW. EDA H-mode, threshold Prf is 0.7 MW (must add ohmic, of course). H/(H+D)=3.5%. Another big impurity injection at 1 s. Gate valve was open, and will remain open until further notice. Next shot: no PCS changes. |
| Apr 26 2005 12:41:17:580PM | 1050426005 | Robert Granetz | Plasma. Similar to previous shots today. Jim Terry reports that molybdenum in the plasma is down by an order of magnitude compared to last week. Prf peaks at 3 MW briefly. H-factor reported to reach 1.6 at that time. Two large impurity injections again. Gate valves are open. Next shot: no PCS changes. Prf will be increased to 4 MW. |
| Apr 26 2005 12:55:07:190PM | 1050426006 | Robert Granetz | Plasma. Good shot. J-port faulted so max Prf=2 MW. Max Wpla > 150 kJ. H-factor is 1.7 and rising until a late impurity injection. H/(H+D)=3%. John Rice reports "no moly". Gate valve open. Next shot: no PCS changes. |
| Apr 26 2005 01:09:03:160PM | 1050426007 | Robert Granetz | Plasma. Good shot. Max Prf=4 MW. Max Wpla > 190 kJ. H/(H+D)=3%. Zeff=1.0-1.1 Next shot: start shot-to-shot RF power scan. No PCS changes. |
| Apr 26 2005 01:10:46:207PM | 1050426007 | Robert Granetz | Beautiful miniature exploding fireworks shell on LH video view at t=0.211 s (frame 7). |
| Apr 26 2005 01:17:46:910PM | 1050426008 | Robert Granetz | Fizzle. Next shot: reduce pre-fill puff by 2 ms. Turn on argon with 50 ms puff at t=0.3 s. |
| Apr 26 2005 01:34:09:003PM | 1050426009 | Robert Granetz | Plasma. Good shot. Strange H-mode behavior, or lack thereof. Max Prf=2 MW, but no H-mode at that time. There was an earlier ELM-free H-mode when Prf=1 MW. Next shot: no PCS changes. Continue RF power scan. |
| Apr 26 2005 01:45:18:550PM | 1050426010 | Robert Granetz | Plasma. Good shot. Another shot with strange H-mode behavior. Prf=2 MW at first, then 1 MW. Plasma takes a long time to transition to an (ELM-free) H-mode. Ditto with the 2nd RF pulse. Next shot: disable the argon puff. No PCS changes. |
| Apr 26 2005 02:04:57:207PM | 1050426011 | Robert Granetz | Plasma. Good shot. No argon puffed this shot. Nice EDA on the first RF pulse (2 MW), but no H-mode on the 2nd pulse (1.6 MW). H/(H+D)=3% Next shot: no PCS changes. No argon. |
| Apr 26 2005 02:13:52:970PM | 1050426012 | Robert Granetz | Plasma. Good shot. Prf=2 MW then 3 MW. Plasma stays in EDA H-mode even through the intervening ohmic period. Max Wpla > 170 kJ. H/(H+D)=3%. Next shot: gate valve will remain closed for 5 minutes after the shot. |
| Apr 26 2005 02:21:42:643PM | 1050426013 | Robert Granetz | Fizzle. Next shot: reduce pre-fill by 1 ms. Keep the gate valves closed. |
| Apr 26 2005 02:42:38:080PM | 1050426014 | Robert Granetz | Plasma. Good shot. Max Prf=4 MW. Max Wpla = 226 kJ. Large 1/1 oscillations on x-rays and nl_04 between the two H-mode/RF periods. Max H-factor = 1.9. H/(H+D)=3%. Next shot: repeat, no changes. Gate valve will remain closed. |
| Apr 26 2005 02:49:03:707PM | 1050426015 | Robert Granetz | Fizzle. Everything looks very good. Next shot: keep the gate valve open. No PCS changes. |
| Apr 26 2005 03:12:31:613PM | 1050426016 | Robert Granetz | Plasma. Good shot. Prf=4 MW. Wpla=220 kJ. H/(H+D)=3.7%. Next shot: puff deuterium t=0.7-1.2 s. Gate valve remains open. |
| Apr 26 2005 03:22:21:970PM | 1050426017 | Robert Granetz | Dud. I don't see why. Gas and fields look fine. Next shot: add 1 ms to pre-fill. Keep gate valve open. |
| Apr 26 2005 03:37:35:183PM | 1050426018 | Robert Granetz | Plasma. Good shot. Max Prf=4 MW. Max Wpla=220 kJ. There was a very big injection at 0.9 s, but nothing shows up on the video views. Next shot: repeat without the injection, hopefully. Gate valve will remain open. |
| Apr 26 2005 03:45:49:793PM | 1050426019 | Robert Granetz | Fizzle. Current didn't rise fast enough so it got squashed into the inboard wall. Next shot: reduce pre-fill by 1 ms. (I just increased it on the last shot because of the dud !) |
| Apr 26 2005 05:25:41:670PM | 1050426020 | Robert Granetz | No-power shot cycle. Alternator bearing alarm occurred during CHECK state. |
| Apr 26 2005 04:32:43:777PM | 1050426021 | Robert Granetz | Plasma. Good shot. I think it's a record stored energy of 238 kJ. Max Prf=5 MW, briefly. Breakdown and current rise look great. Next shot: repeat, including the D2 puff again. |
| Apr 26 2005 04:46:19:043PM | 1050426022 | Robert Granetz | Plasma. Good shot. Peak Wpla=250 kJ...another new record. Peak Prf=5.1 MW. H/(H+D)=3.5-4%. Zeff=1.0-1.4. Moly is starting to come up. Next shot: turn off D2 puff, turn on N2 NINJA puff. |
| Apr 26 2005 05:03:06:090PM | 1050426023 | Robert Granetz | Plasma. Good shot. Wpla=200 kJ. Max Prf=4 MW, except for a very brief excursion to 5 MW. Next shot: Next shot cancelled. Alternator bearing alarm when off again. End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 10:55:28:627AM | Plasma | Ok | |
| 2 | 11:39:14:817AM | Plasma | Ok | |
| 3 | 11:54:45:143AM | Plasma | Ok | |
| 4 | 12:17:18:020PM | Plasma | Ok | |
| 5 | 12:31:03:923PM | Plasma | Ok | |
| 6 | 12:43:43:440PM | Plasma | Ok | |
| 7 | 12:57:14:970PM | Plasma | Ok | |
| 8 | 01:09:49:363PM | Plasma | Ok | |
| 9 | 01:22:28:410PM | Plasma | Ok | |
| 10 | 01:35:21:173PM | Plasma | Ok | |
| 11 | 01:48:18:627PM | Plasma | Ok | |
| 12 | 02:05:49:550PM | Plasma | Ok | |
| 13 | 02:18:27:660PM | Plasma | Ok | |
| 14 | 02:31:27:410PM | Plasma | Ok | |
| 15 | 02:45:15:923PM | Plasma | Ok | |
| 16 | 03:00:09:643PM | Plasma | Ok | |
| 17 | 03:15:05:660PM | Plasma | Ok | |
| 18 | 03:28:03:330PM | Plasma | Ok | |
| 19 | 03:40:40:030PM | Plasma | Ok | |
| 20 | 03:53:15:730PM | Test | Bad | |
| 21 | 04:22:03:887PM | Plasma | Ok | |
| 22 | 04:34:35:607PM | Plasma | Ok | |
| 23 | 04:48:05:200PM | Plasma | Ok | |