| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Steve Wukitch |
| Physics operator(s): | Robert Granetz,Ian Hutchinson |
| Engineering operator(s): | Bill Parkin,Bill Byford,Gary Dekow |
| Engineering Operator Run Comment |
| Cleanup and RF Conditioning; PO: Granetz; EO: Dekow/Byford/Parkin |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:34:443PM |
| Author: Steve Wukitch |
| Run summary for 1031106a MP: #349 D-port quarter-wavelength transformers prematching performance MP: #355 ICRF Testing and Conditioning This run is a continuation of 1031104a. Taking the reactive loading from the plasma into account, the second quarter-wavelength transformer (closer to the PS/ST pair) was moved towards the PS/ST by 9 inches. The prematching system will be re-evaluated with this configuration. The ideal transmission line model predicts a rduction of the reduction coefficient in the 0.5-0.6 range (from 0.7-0.8 initially). ICRF conditionning will also continue. Summary ======= With the modified configuration, the maximum voltage in the stub-tuner/phase-shifter could be reduced by 10 kV for 1.5 MW operations. The reflection coefficient lies in the 0.5-0.6 range for typical plasmas, as expected by the model. The phase of the reflection coefficient is also in agreement with predictions. The overall performance of the antenna is not reduced by the system. This demonstrates that prematching transformers can reduce the voltage in the tuning components without affecting the power limits or the overall performance of the antennas. This also shows that ideal transmission line theory can be used to design suitable prematching systems after proper characterization of the loading (both resistive and reactive components) in plasma conditions. Larger reductions of the VSWR should be obtained by moving the first transformer in D-port antenna, and a similar technique will also be implemented on the E-port transmission line network. A RECORD level of total RF power was launched into plasma. All four antennas were working fine at 1.5 MW level. Trophy shots: shot 26: ~6.0 MW continuous for 350 ms. (USN D plasma). shot 28: ~6.0 MW, only one trip in a 450 ms period. (USN) shot 29: ~6.0 MW, only one trip in a 400 ms period. (USN) shot 17: 5.2 MW, 700 ms, no faults. (Upper single-null He plasma) shot 5: ~5.3 MW, H-mode in USN D plasma. Fine tune of the FMIT#4 FPA output load reduced its screen current. As a result, it did not trip until the last shot (29) at the power level of 1.5 MW. (FPA bias circuit breaker was tripped after shot 17). ---------------------------------------------------------------------------- 1031106001 ylin RF Nov 6 2003 9:43:06:033AM . . . . . . . . . . . . . . . . . . . . 001 BT = 5.4 T, nl04 = .8e20 m^-2, Ip = .8 MA, Single upper-null D: 0.5 MW [0.6, 1.5] sec E: 0.8 MW, [0.6, 1.5] sec J: 0.8 MW x 2 [0.8, 1.5] sec result: Plasma. D: ran. mis-matched. Tune next shot. E: ran. clean J: ran. one failed start in the beginning. - Next: raise power. ----------------------------------------------------------------------------- 1031106002 ylin RF Nov 6 2003 10:11:15:786AM . . . . . . . . . . . . . . . . . . . . 002 BT = 5.4 T, nl04 = .8e20 m^-2, Ip = .8 MA, Single upper-null D: 0.8 MW [0.6, 1.5] sec E: 1.0 MW, [0.6, 1.5] sec J: 1.0 MW x 2 [0.8, 1.5] sec result: Plasma. D: ran. two short trips. E: ran. clean J: ran. clean Max energy: 102 kJ. Next: raise power again. Charley retuned FMIT#4 FPA output load. The FPA screen is noticably lower than that in run 1031104. ----------------------------------------------------------------------------- 1031106003 ylin RF Nov 6 2003 10:22:44:470AM . . . . . . . . . . . . . . . . . . . . 003: BT = 5.4 T, nl04 = 1.0e20 m^-2, Ip = .8 MA, Single upper-null D: 1.0 MW [0.6, 1.5] sec E: 1.1 MW, [0.6, 1.5] sec J: 1.1 MW x 2 [0.8, 1.5] sec result: Plasma. D: ran. some trips in starting, then ran clean. E: ran. clean J: ran. two trips. Max Prf: 4.8 MW. L-mode. H/D ratio: 0.06-0.2 D port voltage in stub tuner and phase shifter is significantly reduced by the quarter-wave transformer. The reflection coefficient at DC2 is down to about 0.3. Next: raise power again. ----------------------------------------------------------------------------- 1031106004 ylin RF Nov 6 2003 10:32:15:653AM . . . . . . . . . . . . . . . . . . . . 004: BT = 5.4 T, nl04 = 1.2e20 m^-2, Ip = .8 MA, Single upper-null D: 1.1 MW [0.6, 1.5] sec E: 1.2 MW, [0.6, 1.5] sec J: 1.2 MW x 2 [0.8, 1.5] sec result: Plasma. D: ran. max faults E: ran. 3 trips J: ran. max faults Density was high. PO will lower density back to 1.0 for the next shot Next same RF. ----------------------------------------------------------------------------- 1031106005 ylin RF Nov 6 2003 11:00:40:406AM . . . . . . . . . . . . . . . . . . . . 005: BT = 5.4 T, nl04 = 1.0e20 m^-2, Ip = .8 MA, Single upper-null D: 1.1 MW [0.6, 1.5] sec E: 1.2 MW, [0.6, 1.5] sec J: 1.2 MW x 2 [0.8, 1.5] sec result: Plasma. D: ran. 7 faults at 1.2 MW. E: ran. clean at 1.5 MW level. J: ran. max faults. Max Prf: 5.3 MW. a short H-mode. H/D ratio: 0.07-0.17 Next: Lower single null. ----------------------------------------------------------------------------- 1031106006 ylin RF Nov 6 2003 11:18:49:490AM . . . . . . . . . . . . . . . . . . . . 006: BT = 5.4 T, nl04 = 1.0e20 m^-2, Ip = .8 MA, Lower single null D: 1.1 MW [0.6, 1.5] sec E: 1.2 MW, [0.6, 1.5] sec J: 1.2 MW x 2 [0.8, 1.5] sec result: Plasma. D: ran. 3 trips. E: ran. clean. J: ran. max faults. 3 H-modes. H/D ratio: ~0.1 Next: Raise D power. ----------------------------------------------------------------------------- 1031106007 ylin RF Nov 6 2003 11:35:07:836AM . . . . . . . . . . . . . . . . . . . . 007: BT = 5.4 T, nl04 = 1.0e20 m^-2, Ip = .8 MA, Lower single null D: 1.2 MW [0.6, 1.5] sec E: 1.2 MW, [0.6, 1.5] sec J: (ramp from 1.0 to 1.2 MW) x 2 [0.8, 1.5] sec result: Plasma. D: ran. 6 trips. E: ran. clean. J: ran. max faults. J4 DC1 arc. ----------------------------------------------------------------------------- 1031106008 ylin RF Nov 6 2003 11:48:30:053AM . . . . . . . . . . . . . . . . . . . . 008: BT = 5.4 T, nl04 = 1.0e20 m^-2, Ip = .8 MA, Lower single null D: 1.2 MW [0.6, 1.5] sec E: 1.2 MW, [0.6, 1.5] sec J: 1.0 MW x 2 [0.8, 1.5] sec result: Plasma. D: ran. max faults E: ran. clean. J: ran. max faults. Better. Next: He plasmas. Lower single null. ----------------------------------------------------------------------------- 1031106009 ylin RF Nov 6 2003 12:03:34:960PM . . . . . . . . . . . . . . . . . . . . He plasma. LSN. Disrupted before RF. ----------------------------------------------------------------------------- 1031106010 ylin RF Nov 6 2003 12:22:31:983PM . . . . . . . . . . . . . . . . . . . . 010: He plasma. LSN. Disrupted at 0.62 s. 20 ms D and E power. ----------------------------------------------------------------------------- 1031106011 ylin RF Nov 6 2003 12:43:42:506PM . . . . . . . . . . . . . . . . . . . . 011: BT = 5.4 T, nl04 = 0.8e20 m^-2, Ip = .8 MA, LSN, He plasma D: 1.2 MW [0.6, 1.5] sec E: 1.2 MW, [0.6, 1.5] sec J: 1.0 MW x 2 [0.8, 1.5] sec result: Plasma. D: ran. max faults. E: ran. max faults. J: ran. 5 faults. Next tune all antennas. Same power. Max RF: 4.7 MW. Several H-mode. J3 xbar fired right after the shot. ----------------------------------------------------------------------------- 1031106012 ylin RF Nov 6 2003 12:55:15:600PM . . . . . . . . . . . . . . . . . . . . 012: BT = 5.4 T, nl04 = 0.8e20 m^-2, Ip = .8 MA, LSN, He plasma D: 1.2 MW [0.6, 1.5] sec E: 1.2 MW, [0.6, 1.5] sec J: 1.0 MW x 2 [0.8, 1.5] sec result: Plasma. D: ran. max faults. better. E: ran. clean J: ran. 2 trips. Next raise J power. Max RF: 4.8 MW. 9 short H-modes H/D at 0.2 (Wall level) ----------------------------------------------------------------------------- 1031106013 ylin RF Nov 6 2003 1:09:04:660PM . . . . . . . . . . . . . . . . . . . . 013: BT = 5.4 T, nl04 = 0.8e20 m^-2, Ip = .8 MA, LSN, He plasma D: 1.2 MW [0.6, 1.5] sec E: 1.2 MW, [0.6, 1.5] sec J: 1.1 MW x 2 [0.8, 1.5] sec result: Plasma. D: ran. 9 faults E: ran. clean J: ran. 1 trip. Next raise J power. Max RF: 5.1 MW. a lot H-modes Next: no RF. ----------------------------------------------------------------------------- 1031106014 ylin RF Nov 6 2003 1:19:25:643PM . . . . . . . . . . . . . . . . . . . . 014: No RF as required by PO and B. Lipschultz. Next: repeat. ----------------------------------------------------------------------------- 1031106015 ylin RF Nov 6 2003 1:30:28:576PM . . . . . . . . . . . . . . . . . . . . same as 014. ----------------------------------------------------------------------------- 1031106017 ylin RF Nov 6 2003 3:13:28:086PM . . . . . . . . . . . . . . . . . . . . 017: BT = 5.4 T, nl04 = 0.8e20 m^-2, Ip = .8 MA, USN, He plasma D: 1.2 MW [0.6, 1.5] sec E: 1.3 MW, [0.6, 1.5] sec J: 1.2 MW x 2 [0.8, 1.5] sec result: Plasma. D: ran. Clean E: ran. Clean J: ran. Clean Max RF: 5.3 MW. Perfect shot! FMIT#4 FPA bias circuit breaker tripped right after the shot. ----------------------------------------------------------------------------- 1031106018 ylin RF Nov 6 2003 2:46:39:650PM . . . . . . . . . . . . . . . . . . . . 018: BT = 5.4 T, nl04 = 0.8e20 m^-2, Ip = .8 MA, USN, D plasma D: 1.2 MW [0.6, 1.5] sec E: 1.3 MW, [0.6, 1.5] sec J: 1.2 MW x 2 [0.8, 1.5] sec result: Plasma. D: ran. Max faults after 1.09 sec. E: ran. Clean J: ran. two trips. Max RF: 5.3 MW. H/D: ~ 0.2 Te0 approaches 5 keV Next tune all antennas. Raise J power. ----------------------------------------------------------------------------- 1031106019 ylin RF Nov 6 2003 2:55:49:270PM . . . . . . . . . . . . . . . . . . . . 019: BT = 5.4 T, nl04 = 0.8e20 m^-2, Ip = .8 MA, USN, D plasma D: 1.2 MW [0.6, 1.5] sec E: 1.3 MW, [0.6, 1.5] sec J: 1.3 MW x 2 [0.8, 1.5] sec result: Plasma. D: ran. 5 faults. Much better. 1.4 MW E: ran. Clean. 1.5 MW J: ran. 6 faults. 2.7 MW. Max RF: ~5.6 MW. H/D: ~ 0.2 Next: raise D and E power. ----------------------------------------------------------------------------- 1031106020 ylin RF Nov 6 2003 3:07:34:940PM . . . . . . . . . . . . . . . . . . . . 020: BT = 5.4 T, nl04 = 0.8e20 m^-2, Ip = .8 MA, USN, D plasma D: 1.3 MW, [0.6, 1.5] sec E: 1.4 MW, [0.6, 1.5] sec J: 1.3 MW x 2 [0.8, 1.5] sec result: Plasma. D: ran. faulted out early. Could not restart while E port ran. 1.5 MW. E: ran. 1 trip. 1.7 MW. J: ran. max trip. continuous for 200 ms at 2.7 MW. Next: reduce E power. Start all antennas at 0.6 sec. ----------------------------------------------------------------------------- 1031106022 ylin RF Nov 6 2003 4:21:04:570PM . . . . . . . . . . . . . . . . . . . . 022: BT = 5.4 T, nl04 = 1.0e20 m^-2, Ip = .8 MA, USN, D plasma D: 1.3 MW, [0.6, 1.5] sec E: 1.3 MW, [0.6, 1.5] sec J: 1.3 MW x 2 [0.6, 1.5] sec result: Plasma. D: ran. max faults. two continuous periods more than 100 ms each E: ran. clean. 1.6 MW. J: ran. max faults. 2.7 MW. two continuous periods more than 100 ms each Max rf: ~5.95 MW for 130 ms. H/D: ~0.2 Next: no RF as requested. ----------------------------------------------------------------------------- 1031106023 ylin RF Nov 6 2003 3:40:28:836PM . . . . . . . . . . . . . . . . . . . . No RF as requested. ----------------------------------------------------------------------------- 1031106024 ylin RF Nov 6 2003 3:54:39:086PM . . . . . . . . . . . . . . . . . . . . fizzle ----------------------------------------------------------------------------- 1031106025 ylin RF Nov 6 2003 4:20:39:460PM . . . . . . . . . . . . . . . . . . . . 025: BT = 5.4 T, nl04 = 1.0e20 m^-2, Ip = .8 MA, USN, D plasma D: 1.3 MW, [0.6, 1.5] sec E: 1.35 MW, [0.6, 1.5] sec J: 1.3 MW x 2 [0.6, 1.5] sec result: Plasma. D: ran. 7 faults. 1.5 MW E: ran. clean. 1.5 MW. J: ran. Max faults. 3 MW. two continuous periods more than 100 ms each. Max rf: ~6 MW for two 100 ms periods. H/D: ~0.17 Te0 to 4.5 keV. ----------------------------------------------------------------------------- 1031106026 ylin RF Nov 6 2003 4:24:13:480PM . . . . . . . . . . . . . . . . . . . . 026: BT = 5.4 T, nl04 = 1.0e20 m^-2, Ip = .8 MA, USN, D plasma D: 1.3 MW, [0.6, 1.5] sec E: 1.35 MW, [0.6, 1.5] sec J: 1.3 MW x 2 [0.6, 1.5] sec result: Plasma. D: ran. 3 faults. 1.55 MW E: ran. clean. 1.6 MW. J: ran. Max faults. 2.9 MW. Max rf: ~6.0 MW continuous 350 ms. H/D: ~0.06 to 0.23 Te0 to 4.5 keV. ----------------------------------------------------------------------------- 1031106027 ylin RF Nov 6 2003 4:31:49:660PM . . . . . . . . . . . . . . . . . . . . fizzle ----------------------------------------------------------------------------- 1031106028 ylin RF Nov 6 2003 4:56:45:480PM . . . . . . . . . . . . . . . . . . . . 028: BT = 5.4 T, nl04 = 1.0e20 m^-2, Ip = .8 MA, USN, D plasma D: 1.3 MW, [0.6, 1.5] sec E: 1.35 MW, [0.6, 1.5] sec J: 1.3 MW x 2 [0.6, 1.5] sec result: Plasma. D: ran. 4 faults. 1.55 MW E: ran. one trip. 1.6 MW. J: ran. Max faults. 2.9 MW. Max rf: ~6.0 MW, only one trip in a 450 ms period. H/D: ~0.2 Te0 to 4.5 keV Next shot: repeat. ----------------------------------------------------------------------------- 1031106029 ylin RF Nov 6 2003 4:58:30:640PM . . . . . . . . . . . . . . . . . . . . 029: BT = 5.4 T, nl04 = 1.0e20 m^-2, Ip = .8 MA, USN, D plasma D: 1.3 MW, [0.6, 1.5] sec E: 1.35 MW, [0.6, 1.5] sec J: 1.3 MW x 2 [0.6, 1.5] sec result: Plasma. D: ran. 1 faults. 1.55 MW E: ran. 4 trips. 1.6 MW. J: ran. 2 faults. 2.9 MW. #4 FPA screen overloaded. Max rf: ~6.0 MW, only one trip in a 400 ms period. H/D: ~ 0.2 Te0 to 4.5 keV. |
| Entered: Jul 7 2004 03:49:34:617PM |
| Author: Steve Wukitch |
| Conditioning and cleanup with piggyback of MP 364 - 'Measurement of wall pumping on Alcator C-Mod' This mini-proposal has a number of interconnected goals all having to do with the wall sources and sinks of neutrals. First we would like to determine the role of the wall/limiters as a source of neutrals during RF power injection. The role of boronization in affecting the wall pumping/sources will be addressed. Understanding the processes involved will help us better control the plasma density (better understand the utility of the cryopump) and perhaps the H/D ratio. A further goal is to understand the scaling of pumping processes to enable prediction of the T stored in a high-Z first-wall in a BPX w/B in the vessel. Summary of results: 1031106 had many changes in equilibrium and gas type that we were able to push to try and understand the sources of gas and pumping. H/D again rose throughout the day, being lower when the RF was off (by 5-8%). Running upper single-null shots (see physop summary, shots 1-5, 16-28) led to a large surplus of gas (outgassing). Switching to He (shots 9-17) was done mostly in Lower single-null and resulted in a large increase in H/D (up to 30% from 12%). We believe that any H or D seen in He fill discharges comes from the wall so that He gas-puff shots are a real measure of the near surface resevoir of H/D. RF shots (these were fairly high power) also raised the H/D as mentioned earlier. Between 1031106 and 1031107 the machine was boronized. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:19:647PM |
| Author: Ian Hutchinson |
| Physics operator summary for run 1031106 (Thursday): Purpose: continued cleanup and RF conditioning Physics operator: R. Granetz Engineers in charge: Gary and the Bills (good name for a rock group) Summary: A very productive day indeed. We ran upper single nulls in deuterium and helium, lower single nulls in deuterium and helium, a few ohmic, and many with very high power RF. Bruce got plenty of data on wall pumping, and the RF group had many shots with 5-6 MW (see shot 17 for high power with no faults), and even 6 MW for 0.5 s by the last shot of the day (29). A number of shots had peak stored energies above 100 kJ. Also, on the last shot the MSE might have obtained some interesting measurements of large sawteeth. H/D remained rather high, even after "wall cleaning" by the helium plasmas. Startup was very reliable today, and there were only two plasmas that didn't make it well into rampdown. Based on today's run, we have decided to go ahead with boronization after the run. Good shots (all 0.8 MA, 5.4 T): Upper single null, deuterium: 1-5, 18-23 (23 ohmic), 25, 26, 28, 29 Lower single null, helium: 11-15 (13,14 ohmic) Upper single null, helium: 16 (ohmic), 17 Lower single null, deuterium: 6-8 Scorecard: 27 plasmas 2 fizzles 0 duds 0 test or no-power shot cycle 0 aborted and/or screwed up by computer problems ---------- 29 total ------------------------------------------------------------------------------- Engineering setup for Thursday, 06 Nov 2003 Purpose: continued cleanup and RF conditioning Physics operator: R. Granetz 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 on 1031104028 (0.8 MA, 5.4 T, UPPER single null) A-coils should be hooked up as on 1030507012 (+Dtop -Dbot -Jtop +Jbot), but the power supply should NOT be enabled. ** NOTE **: If boronization is done after today's run, as tentatively scheduled, all shutters must be closed following the end of the run. 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) Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB ------------------------------------------------------------------------------- RF Setup: All 4 transmitters in Run On by 08:00. ------------------------------------------------------------------------------- Run Plan: Start with upper null plasmas and bang away until it seems to be cleaning up. Evaluate whether or not the vessel is ready for boronization. ------------------------------------------------------------------------------- ECDC was done overnight, as well as a 60 C bake. Hybrid coldstart done by the engineering group; no errors found Loaded PCS (all segments) from shot 1031104028 (1.0 MA, 5.4 T, single null upper) ------------------------------------------------------------------------------- At Bruce's request, the main gate valve will remain closed for 8 minutes after each shot, starting from the very first shot of the day Shot 01 -- Plasma. Good shot. 0.8 MA, 5.4 T, upper single null. The TCI signal failed, including the density feedback signal, but the shot went along just fine. Prf=2.7 MW from E and J. H/D is too noisy to give a value. No H-mode. Vessel pressure got to a few x 10-4 torr after the shot. Next shot: decrease pre-fill puff by 2 ms. Shot 02 -- Plasma. Good shot. nl_04=0.8e20 m-2, but the signal is noisy. Prf=4.3 MW. Wth hits 100 kJ briefly. H/D ramps from 0.05 to >0.20. No H-mode. Vessel pressure got to 7.4 x 10-4 torr. Next shot: raise nl_04 to 1.0e20 m-2 (from 0.8) Shot 03 -- Plasma. Good shot. nl_04=1.0-1.1e20 m-2. Disrupted during rampdown, probably because the density won't come down, even though the gas puffing is off after t=1 s. Prf=4.9 MW! Next shot: raise nl_04 to 1.2e20 m-2. Shot 04 -- Plasma. Good shot. nl_04=1.2e20 m-2. RF didn't like the higher density. H/D=0.07-0.10 (but not much RF). Vessel pressure went up to 1.7e-3 torr. Next shot: reduce nl_04 back to 1.0e20 m-2. Shot 05 -- Plasma. Good shot. Prf<=5.4 MW, but with lots of faulting. This shot had a brief H-mode early. We're trying to get MSE data during the large sawteeth around t=1 s (which remains in L-mode because of the upper null), but the MSE camac is having problems. Next shot: change to lower signal null. Load segment 2 from shot 1031017008. Ip stays at 0.8 MA, nl_04 remains at 1.0e20 m-2. Shot 06 -- Plasma. Good shot. Lower null. 0.8 MA, 5.4 T, nl_04=1.0e20 m-2 target, but there are H-modes, of course. Prf=2.7 MW (from D & E). H/D=0.08-0.12 (same as preceding shot, which was upper null). Next shot: repeat so that RF gets a better tune and more power. Shot 07 -- Plasma. Good shot. RF still isn't getting power from J. DNB contactor won't stay closed. Probably no DNB for the rest of today. Next shot: repeat for the RF Shot 08 -- Plasma. Same-o, same-o. RF still can't get J going into the lower null. Next shot: CHANGE OVER TO HELIUM PLASMAS ! Same Ip, Btor, nl_04, and lower null configuration. Shot 09 -- Plasma. Disrupted very early because the density feedback signal had fringe problems. DNB is firing again. Next shot: no changes, try again. Shot 10 -- Plasma. Disrupted at t=0.62 s. Might be a marfe/poloidal detachment. Next shot: lower nl_04 to 0.6e20 m-2 Shot 11 -- Plasma. Good shot. The canonical helium plasma at 0.8 MA, 5.4 T, 0.77e20 m-2, lower single null. Prf=3.3 MW. Multiple little H-modes. Rdd=1.0e12 s-1. H/D=0.175 Next shot: raise nl_04 to 0.8e20 m-2 at t=0.6 s. Also move argon puff 100 ms earlier (to 0.2 s) Shot 12 -- Plasma. Good shot. Prf=3.6-4.6 MW. Lots of short little H-modes. H/D=0.20-0.22. nl_04 rises to 1.0e20 m-2 after t=0.6 s, sort of as programmed. Next shot: repeat for RF. Move argon puff back to t=0.3 s. Shot 13 -- Plasma. Good shot. Prf=5.1 MW. H/D=0.2-0.3. Lots of short little H-modes. Zeff=3.0. Rdd is still around 1.e12 s-1. Next shot: no RF (at Bruce's request) Shot 14 -- Plasma. Good shot. No RF (on purpose). No H-modes. H/D=0.2-0.3, perhaps a tiny amount less than with RF. Next shot: no RF again, but double the argon pulse length. Shot 15 -- Plasma. Good shot. No RF (on purpose). No H-modes. Similar H/D as the preceding shot. Argon detector signal actually went down. Next shot: switch back to upper single null. Put argon puff back to 42 ms. Shot 16 -- Plasma. Good shot. No RF (on purpose). H/D has no signal. Next shot: turn the RF back on. Also cut argon puff in half. Shot 17 -- Plasma. Good shot. Upper single null. Prf=5.2 MW. Incredibly good-looking RF waveforms...no faulting. Rdd=1e12 s-1. Wth peaks at 96 kJ. H/D=0.3, but very noisy. Next shot: change back to deuterium plasmas. All other parameters remain the same, including the upper single null configuration. There will be a 20 minute delay while some TF SCR's and fuses are checked. Shot 18 -- Plasma. Good shot. Deuterium, upper single null, 0.8 MA, 5.4 T. Prf=5.4 MW. Max Wth=108 kJ. There's a 100 ms burst of x-ray and radiated power at t=1.0-1.1 s that doesn't seem to be associated with anything, but John Rice says it's moly. H/D=0.2-0.3. Bruce says that the wall on this first post-helium shot is pumping incredible amounts of deuterium. Next shot: repeat to see if the deuterium pumping levels off. Also increase argon puff duration by 50%. Shot 19 -- Plasma. Good shot. Prf=5.6 MW with only a couple of faults. H/D approx 0.22. Next shot: repeat; raise Prf even higher. Shot 20 -- Plasma. Good shot. Prf=4.4 MW. D-antenna faulted early. H/D=0.20. Next shot: repeat; try to raise Prf. Shot 21 -- Plasma. Good shot. Prf peaks at 5.7 MW, but there's lots of faulting. Next shot: repeat; try to raise Prf. Shot 22 -- Plasma. Good shot. Prf peaks at 6.0 MW for 0.1 s, but then begins faulting. Still no H-modes. H/D=0.19. Good DNB pulse. Next shot: No RF, all else unchanged. Shot 23 -- Plasma. Good shot. Ohmic (on purpose). Pretty plain vanilla shot, except that it's upper single null. This is a baseline shot for Bruce's wall pumping studies. H/D=0.14 (ohmic). Next shot: turn the RF back on. Shot 24 -- Fizzle. First one of the day. Next shot: no changes. Shot 25 -- Plasma. Good shot. Prf=6.0 MW. No H-modes. H/D=0.20. Good DNB pulse during relatively long sawteeth. Next shot: no changes Shot 26 -- Plasma. Good shot. Prf=6.1 MW !! Still no H-modes. There are some pretty big molybdenum radiation excursions. Hate to see what might be happening to the ceiling tile plates. H/D is very noisy. Next shot: no changes Shot 27 -- Fizzle. Ian will take over for the last two shots. This will include Bruce's request to have the main gate valve stay closed for 20 minutes following the last plasma shot. Shot 28 -- Plasma. Good shot. Prf=6.0 MW. Upper single null. Shot 29 -- Plasma. Good shot. Prf=6.0 MW for 0.5 s. Good DNB pulse during large sawteeth. MSE core channel sees noticeable changes. Upper single null. Main gate valve was held closed for 20 minutes after the shot, at Bruce's request. End of run. |
| Session Leader Comments |
| Physics Operator Comments | |||
| Nov 5 2003 06:11:59:230PM | Robert Granetz | Engineering setup for Thursday, 06 Nov 2003 Purpose: continued cleanup and RF conditioning Physics operator: R. Granetz 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 on 1031104028 (0.8 MA, 5.4 T, UPPER single null) A-coils should be hooked up as on 1030507012 (+Dtop -Dbot -Jtop +Jbot), but the power supply should NOT be enabled. ** NOTE **: If boronization is done after today's run, as tentatively scheduled, all shutters must be closed following the end of the run. 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) Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB ------------------------------------------------------------------------------- RF Setup: All 4 transmitters in Run On by 08:00. ------------------------------------------------------------------------------- Run Plan: Start with upper null plasmas and bang away until it seems to be cleaning up. Evaluate whether or not the vessel is ready for boronization. | |
| Nov 6 2003 08:41:43:493AM | Robert Granetz | ECDC was done overnight, as well as a 60 C bake. Hybrid coldstart done by the engineering group; no errors found Loaded PCS (all segments) from shot 1031104028 (1.0 MA, 5.4 T, single null upper) | |
| Nov 6 2003 08:54:30:980AM | Robert Granetz | At Bruce's request, the main gate valve will remain closed for 8 minutes after each shot, starting from the very first shot of the day | |
| Nov 6 2003 09:54:21:500AM | 1031106001 | Robert Granetz | Shot 01 -- Plasma. Good shot. 0.8 MA, 5.4 T, upper single null. The TCI signal failed, including the density feedback signal, but the shot went along just fine. Prf=2.7 MW from E and J. H/D is too noisy to give a value. No H-mode. Vessel pressure got to a few x 10-4 torr after the shot. Next shot: decrease pre-fill puff by 2 ms. |
| Nov 6 2003 10:19:30:403AM | 1031106002 | Robert Granetz | Shot 02 -- Plasma. Good shot. nl_04=0.8e20 m-2, but the signal is noisy. Prf=4.3 MW. Wth hits 100 kJ briefly. H/D ramps from 0.05 to >0.20. No H-mode. Vessel pressure got to 7.4 x 10-4 torr. Next shot: raise nl_04 to 1.0e20 m-2 (from 0.8) |
| Nov 6 2003 10:22:40:173AM | 1031106003 | Robert Granetz | Shot 03 -- Plasma. Good shot. nl_04=1.0-1.1e20 m-2. Disrupted during rampdown, probably because the density won't come down, even though the gas puffing is off after t=1 s. Prf=4.9 MW! Next shot: raise nl_04 to 1.2e20 m-2. |
| Nov 6 2003 10:36:50:423AM | 1031106004 | Robert Granetz | Shot 04 -- Plasma. Good shot. nl_04=1.2e20 m-2. RF didn't like the higher density. H/D=0.07-0.10 (but not much RF). Vessel pressure went up to 1.7e-3 torr. Next shot: reduce nl_04 back to 1.0e20 m-2. |
| Nov 6 2003 11:00:21:857AM | 1031106005 | Robert Granetz | Shot 05 -- Plasma. Good shot. Prf<=5.4 MW, but with lots of faulting. This shot had a brief H-mode early. We're trying to get MSE data during the large sawteeth around t=1 s (which remains in L-mode because of the upper null), but the MSE camac is having problems. Next shot: change to lower signal null. Load segment 2 from shot 1031017008. Ip stays at 0.8 MA, nl_04 remains at 1.0e20 m-2. |
| Nov 6 2003 11:20:07:443AM | 1031106006 | Robert Granetz | Shot 06 -- Plasma. Good shot. Lower null. 0.8 MA, 5.4 T, nl_04=1.0e20 m-2 target, but there are H-modes, of course. Prf=2.7 MW (from D & E). H/D=0.08-0.12 (same as preceding shot, which was upper null). Next shot: repeat so that RF gets a better tune and more power. |
| Nov 6 2003 11:41:50:437AM | 1031106007 | Robert Granetz | Shot 07 -- Plasma. Good shot. RF still isn't getting power from J. DNB contactor won't stay closed. Probably no DNB for the rest of today. Next shot: repeat for the RF |
| Nov 6 2003 11:50:05:697AM | 1031106008 | Robert Granetz | Shot 08 -- Plasma. Same-o, same-o. RF still can't get J going into the lower null. Next shot: CHANGE OVER TO HELIUM PLASMAS ! Same Ip, Btor, nl_04, and lower null configuration. |
| Nov 6 2003 12:14:08:553PM | 1031106009 | Robert Granetz | Shot 09 -- Plasma. Disrupted very early because the density feedback signal had fringe problems. DNB is firing again. Next shot: no changes, try again. |
| Nov 6 2003 12:29:52:413PM | 1031106010 | Robert Granetz | Shot 10 -- Plasma. Disrupted at t=0.62 s. Might be a marfe/poloidal detachment. Next shot: lower nl_04 to 0.6e20 m-2 |
| Nov 6 2003 12:43:54:303PM | 1031106011 | Robert Granetz | Shot 11 -- Plasma. Good shot. The canonical helium plasma at 0.8 MA, 5.4 T, 0.77e20 m-2, lower single null. Prf=3.3 MW. Multiple little H-modes. Rdd=1.0e12 s-1. H/D=0.175 Next shot: raise nl_04 to 0.8e20 m-2 at t=0.6 s. Also move argon puff 100 ms earlier (to 0.2 s) |
| Nov 6 2003 12:58:17:900PM | 1031106012 | Robert Granetz | Shot 12 -- Plasma. Good shot. Prf=3.6-4.6 MW. Lots of short little H-modes. H/D=0.20-0.22. nl_04 rises to 1.0e20 m-2 after t=0.6 s, sort of as programmed. Next shot: repeat for RF. Move argon puff back to t=0.3 s. |
| Nov 6 2003 01:12:20:417PM | 1031106013 | Robert Granetz | Shot 13 -- Plasma. Good shot. Prf=5.1 MW. H/D=0.2-0.3. Lots of short little H-modes. Zeff=3.0. Rdd is still around 1.e12 s-1. Next shot: no RF (at Bruce's request) |
| Nov 6 2003 01:23:05:757PM | 1031106014 | Robert Granetz | Shot 14 -- Plasma. Good shot. No RF (on purpose). No H-modes. H/D=0.2-0.3, perhaps a tiny amount less than with RF. Next shot: no RF again, but double the argon pulse length. |
| Nov 6 2003 01:42:34:870PM | 1031106015 | Robert Granetz | Shot 15 -- Plasma. Good shot. No RF (on purpose). No H-modes. Similar H/D as the preceding shot. Argon detector signal actually went down. Next shot: switch back to upper single null. Put argon puff back to 42 ms. |
| Nov 6 2003 01:50:17:943PM | 1031106016 | Robert Granetz | Shot 16 -- Plasma. Good shot. No RF (on purpose). H/D has no signal. Next shot: turn the RF back on. Also cut argon puff in half. |
| Nov 6 2003 02:04:41:867PM | 1031106017 | Robert Granetz | Shot 17 -- Plasma. Good shot. Upper single null. Prf=5.2 MW. Incredibly good-looking RF waveforms...no faulting. Rdd=1e12 s-1. Wth peaks at 96 kJ. H/D=0.3, but very noisy. Next shot: change back to deuterium plasmas. All other parameters remain the same, including the upper single null configuration. |
| Nov 6 2003 02:12:31:923PM | 1031106017 | Robert Granetz | There will be a 20 minute delay while some TF SCR's and fuses are checked. |
| Nov 6 2003 02:46:32:400PM | 1031106018 | Robert Granetz | Shot 18 -- Plasma. Good shot. Deuterium, upper single null, 0.8 MA, 5.4 T. Prf=5.4 MW. Max Wth=108 kJ. There's a 100 ms burst of x-ray and radiated power at t=1.0-1.1 s that doesn't seem to be associated with anything, but John Rice says it's moly. H/D=0.2-0.3. Bruce says that the wall on this first post-helium shot is pumping incredible amounts of deuterium. Next shot: repeat to see if the deuterium pumping levels off. Also increase argon puff duration by 50%. |
| Nov 6 2003 02:56:50:503PM | 1031106019 | Robert Granetz | Shot 19 -- Plasma. Good shot. Prf=5.6 MW with only a couple of faults. H/D approx 0.22. Next shot: repeat; raise Prf even higher. |
| Nov 6 2003 03:08:44:830PM | 1031106020 | Robert Granetz | Shot 20 -- Plasma. Good shot. Prf=4.4 MW. D-antenna faulted early. H/D=0.20. Next shot: repeat; try to raise Prf. |
| Nov 6 2003 03:16:40:263PM | 1031106021 | Robert Granetz | Shot 21 -- Plasma. Good shot. Prf peaks at 5.7 MW, but there's lots of faulting. Next shot: repeat; try to raise Prf. |
| Nov 6 2003 03:31:21:110PM | 1031106022 | Robert Granetz | Shot 22 -- Plasma. Good shot. Prf peaks at 6.0 MW for 0.1 s, but then begins faulting. Still no H-modes. H/D=0.19. Good DNB pulse. Next shot: No RF, all else unchanged. |
| Nov 6 2003 03:44:55:500PM | 1031106023 | Robert Granetz | Shot 23 -- Plasma. Good shot. Ohmic (on purpose). Pretty plain vanilla shot, except that it's upper single null. This is a baseline shot for Bruce's wall pumping studies. H/D=0.14 (ohmic). Next shot: turn the RF back on. |
| Nov 6 2003 03:57:46:590PM | 1031106024 | Robert Granetz | Shot 24 -- Fizzle. First one of the day. Next shot: no changes. |
| Nov 6 2003 04:15:27:563PM | 1031106025 | Robert Granetz | Shot 25 -- Plasma. Good shot. Prf=6.0 MW. No H-modes. H/D=0.20. Good DNB pulse during relatively long sawteeth. Next shot: no changes |
| Nov 6 2003 04:28:33:750PM | 1031106026 | Robert Granetz | Shot 26 -- Plasma. Good shot. Prf=6.1 MW !! Still no H-modes. There are some pretty big molybdenum radiation excursions. Hate to see what might be happening to the ceiling tile plates. H/D is very noisy. Next shot: no changes |
| Nov 6 2003 04:29:51:800PM | 1031106027 | Robert Granetz | Shot 27 -- Fizzle. |
| Nov 6 2003 04:30:08:270PM | 1031106027 | Robert Granetz | Ian will take over for the last half-hour. This will include Bruce's request to have the main gate valve stay closed for 20 minutes following the last plasma shot. |
| Nov 6 2003 04:55:52:530PM | 1031106028 | Ian Hutchinson | Inherited a fizzle from Bob. Set EF3 voltage to 2500 from 2600 at 5ms. Plasma. 6 MW RF quite well sustained. Up to 2.5MW prad. After the trip at 1s, apparent heating efficiency is lower. No changes for 29 except to keep the gate valves closed. |
| Nov 6 2003 04:59:32:450PM | 1031106029 | Ian Hutchinson | Plasma. 6MW for 0.5s. 3MW of radiation. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:36:51:823AM | Plasma | Ok | |
| 2 | 09:58:14:723AM | Plasma | Ok | |
| 3 | 10:12:13:820AM | Plasma | Ok | |
| 4 | 10:26:40:570AM | Plasma | Ok | |
| 5 | 10:41:35:447AM | Plasma | Ok | |
| 6 | 11:06:16:553AM | Plasma | Ok | |
| 7 | 11:22:49:837AM | Plasma | Ok | |
| 8 | 11:43:07:877AM | Plasma | Ok | |
| 9 | 11:59:56:973AM | Plasma | Ok | |
| 10 | 12:15:57:240PM | Plasma | Ok | |
| 11 | 12:31:21:960PM | Plasma | Ok | |
| 12 | 12:44:57:430PM | Plasma | Ok | |
| 13 | 01:00:40:230PM | Plasma | Ok | |
| 14 | 01:13:03:980PM | Plasma | Ok | |
| 15 | 01:25:52:667PM | Plasma | Ok | |
| 16 | 01:38:53:713PM | Plasma | Ok | |
| 17 | 01:51:34:773PM | Plasma | Ok | |
| 18 | 02:31:45:540PM | Plasma | Ok | |
| 19 | 02:45:54:397PM | Plasma | Ok | |
| 20 | 02:58:22:570PM | Plasma | Ok | |
| 21 | 03:10:27:410PM | Plasma | Ok | |
| 22 | 03:23:10:580PM | Plasma | Ok | |
| 23 | 03:36:25:410PM | Plasma | Ok | |
| 24 | 03:48:46:830PM | Plasma | Ok | |
| 25 | 04:01:23:330PM | Plasma | Ok | |
| 26 | 04:14:04:623PM | Plasma | Ok | |
| 27 | 04:27:10:437PM | Plasma | Ok | |
| 28 | 04:39:36:170PM | Plasma | Ok | |
| 29 | 04:52:45:077PM | Plasma | Ok | |