| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Martin Greenwald,Paul Bonoli |
| Physics operator(s): | Ian Hutchinson |
| Engineering operator(s): | Bill Cochran |
| Engineering Operator Run Comment |
| H-mode Qaulity Task Force. Followed by MP269 ICRF-Induced Rotation if t |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:23:553PM |
| Author: To Be Determined |
| Run Plan for 1000523 mp xxx Benchmark H-mode confinement (H-mode task force) Session Leader - Greenwald Phys Op - Hutchinson ============================ Plan: For the first part of the run we will be bring up RF power after repairing arc damage in the E-antenna feed system. At the same time we will establish a baseline for H-mode confinement. Run "best" case scenario: H/D < 5%, Prf_D+Prf_E > 2.5 MW (steady) , Prf_J = 0, Ip = 1 MA. This will provide a baseline for comparison with our best shots from previous campaigns. ======================================================= Results: After a slow start due to power systems and breaker problems, we were successful in running the specified discharges. On shot 008 we had 2.6 MW RF; 3 MW total (assuming 80% absorbed fraction for the RF). The stored energy reached 0.16 MJ which is right on our scaling for EDA H-modes, beta_N ~ 1.2. Radiated power is under control (except for the natural impurity injections). We should be able to use data from the following shots for comparison with previous campaigns. ------------------------------------------------------- 1000523007 1 MA, 2 MW RF, 2.4 MW total EDA H-mode with .15 MJ H ~ 1.8 stored energy right on nominal curve maybe the best h-mode since 1998 H/D ~ 3-4% ------------------------------------------------------- 1000523008 an injection right at the beginning of the H-mode may be spoiling things a bit - best stored energy only recovered after about 0.4 secs when prad drops below 50% Prf = 2.6 MW; Ptot = 3 MW W = .16 MJ H/D ratio to 4.5% H reaches about 1.8 ------------------------------------------------------- 1000523010 ragged RF and occasional injections average total power was still above 2.5 MW for most of the pulse stored energy only reached .14 MJ |
| Entered: Jul 7 2004 03:49:23:570PM |
| Author: To Be Determined |
| Run Summary for 1000523 Mini-Proposal MP 269: ICRF-Induced Plasma Rotation Scaling Studies (ICRF rotation effects at lower field). Physics Operator: Ian Hutchinson Session Leader: Paul Bonoli One objective of this mini-proposal was to test the theoretical prediction of Perkins et al. that ICRF - induced plasma rotation in C-Mod should change from co- to counter-current as the ICRF resonance is moved from the low to high field side of the tokamak. The results of a half-day of running were very interesting but not conclusive. The toroidal magnetic field was first scanned down from 5.3T to 4.5T and then back up to 6.0T. The ICRF power was kept constant during this scan at approximately 2 MW total, with D-port at 1.1-1.2 MW and E-port at 0.8-0.9 MW. H-mode plasmas were obtained at all fields between 4.5 and 5.3T. Baseline rotation measure- ments were first done at 5.3 T (ICRF resonance at 0.48 cm to the LFS) which indicated V_tor = 50 km /s (from HIREXjr). These plasmas (shots 13 & 14) were EDA H-modes with stored energy of about 95 kJ. The plasma rotation was still observed to be in the co-current direction at 4.9 T on shot 15 (ICRF resonance at 4.6 cm to the HFS). The mean V_tor was slightly lower than at 5.3 T, although the stored energy was also lower (80 kJ). At 4.5 T (shots 15 & 16) the rotation velocity indeed reversed sign to about -20 km /s. However, these plasmas were quite different than the plasmas at 4.9T and 5.3T because the ICRF heating was far off-axis (9.4 cm to the HFS). Evidence of a hollow T_e profile was seen in that the central Thomson T_e was very low. Also sawteeth were suppressed at about 1.2 s, presumably because of a hollow current profile. Evidence of an internal transport barrier (ITB) was also seen in that the central density was rising during the H-mode phase to about 4 X 10^20. The toroidal field was then adjusted to 5.9-6.0 T for shots 19-23. This moved the ICRF resonance 9.4 cm to the LFS and would have allowed us to compare the rotation in a discharge again with off-axis heating, but now on the LFS where V_tor is predicted to always be in the co-current direction. Unfortunately we were not able to carry out this comparison because the D-port transmitter kept on tripping off, resulting in not enough rf power to produce H-mode plasmas with appreciable rotation. It is recommended that these experiments be continued in order to complete the high field comparison at 5.8-6.0T. We would also propose a "spin-off" mini-proposal based on the evidence of ITB formation at low field (4.5 T) with off-axis heating. The thought here (per Martin Greenwald) is that the normal co-rotation observed in C-Mod inhibits formation of internal barriers by counter-acting the diamagnetic term in E_r. By forcing the co-rotation to go through zero or reverse sign (as was done in shots 16 & 17) the plasma gradient term in E_r would then take over, leading to ITB formation. --------------------------------------------------------------------------- Shot by shot summary of MP 269: ---------------------------------------------------------------------------- 1000523011 bonoli SESSION_LEADER May 25 2000 10:27:17:653AM . . . . . . . . . . . . . . . . . . . . Shot 11 - Start toroidal rotation mini-proposal D-port: 1.40 MW E-Port: 1.10 MW Reduce gap Argon turned on ! Plasma - B_o ramp from (5.3 - 4.9 - 5.4) T I_p = 1000 kA Three H-mode phases with nl_04 = 1.6 - 1.8 Rf - trips in D & E, but not fatal Reduce ICRF power on next shot to eliminate rf trips. ---------------------------------------------------------------------------- 1000523012 bonoli SESSION_LEADER May 25 2000 10:29:40:483AM . . . . . . . . . . . . . . . . . . . . Shot 12 - Reduce ICRF power D-port: 1.1 MW E-Port: 0.9 MW Reduce plasma - antenna gap Argon turned on ! Plasma - B_o ramp from (5.3 - 4.9 - 5.4) T I_p = 1000 kA H-modes with nl_04 = 1.7-1.8 Rf - D has trips - fatal E has trips but survives Raise density next shot ---------------------------------------------------------------------------- 1000523013 bonoli SESSION_LEADER May 23 2000 1:47:18:170PM . . . . . . . . . . . . . . . . . . . . Shot 13 - Reduce I_p to 800 kA, incease density D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o ramp from (5.3 - 4.9 - 5.4)T I_p = 800 kA H-mode with nl_04 = 1.5 RF - D & E much better - few trips 2 MW max. ICRF power ---------------------------------------------------------------------------- 1000523014 bonoli SESSION_LEADER May 25 2000 10:35:03:903AM . . . . . . . . . . . . . . . . . . . . Shot 14 - Use flattop B_o pulse (5.3 T) ICRF resonance is 0.47 cm to the LFS D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 5.3 T I_p = 800 kA Good EDA H-mode with nl_04 = 1.5 RF - D & E ran without trips - 2 MW coupled HIREX measuring plasma rotating in the co-direction. Reduce B_o to 4.9 T next shot ---------------------------------------------------------------------------- 1000523015 bonoli SESSION_LEADER May 25 2000 10:33:11:340AM . . . . . . . . . . . . . . . . . . . . Shot 15 - B_o = 4.88T with flattop ICRF resonance is 4.9 cm to the HFS. D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 4.88T I_p = 800 kA Good EDA H-mode with nl_04 = 1.5 RF - D & E ran without trips - 2 MW coupled HIREX shows plasma still rotating in the co-current direction. ---------------------------------------------------------------------------- 1000523016 bonoli SESSION_LEADER May 25 2000 10:37:29:030AM . . . . . . . . . . . . . . . . . . . . Shot 16 - B_o = 4.53T with flattop ICRF resonance is now 9.3 cm to the HFS. D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 4.53T, I_p = 800 kA ELM-free H-mode - nl_04 = 2.0 Plasma terminates with a density collapse RF - D & E ran without trips - 2 MW Off-axis ICRF heating is leading to hollow T_e profiles (?) Some evidence from John's HIREX that rotation reversed ???? Sawteeth stabilized at 1.2 s per IHH ---------------------------------------------------------------------------- 1000523017 bonoli SESSION_LEADER May 25 2000 10:39:00:700AM . . . . . . . . . . . . . . . . . . . . Shot 17 - Run B_o = 4.53T with flattop again D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 4.53T, I_p = 800 kA ELM-free H-mode Plasma terminates with a disruption again RF - D (1 trip) & E(no trips) - 2 MW Plasma rotation "slows" down and reverses sign again, per HIREX. Plasma T_e profiles are hollow with sawteeth stabilized. ---------------------------------------------------------------------------- 1000523018 bonoli SESSION_LEADER May 25 2000 10:40:23:826AM . . . . . . . . . . . . . . . . . . . . Shot 18 - Start 4.5 T flattop earlier D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 4.53T, I_p = 800 kA H-mode with nl_04 = 1.8 No disruption RF - D & E ran without trips HIREX still show a "sign reversal" in rotation No sawtooth stabilization observed on this shot. Go to 6.0 T next shot to attempt to separate out effect on rotation of off-axis heating. ---------------------------------------------------------------------------- 1000523019 bonoli SESSION_LEADER May 25 2000 10:41:22:013AM . . . . . . . . . . . . . . . . . . . . Shot 19 - B_o = 6.0 T flattop - move ICRF resonance to 9.4 cm on the LFS D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 6.0 T I_p = 800 kA No H-mode RF - D tripped out E ran with one trip Take 6.0 T shot again ---------------------------------------------------------------------------- 1000523020 bonoli SESSION_LEADER May 23 2000 4:19:30:543PM . . . . . . . . . . . . . . . . . . . . Shot 20 - B_o = 6.0 T flattop - move ICRF resonance to LFS D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 6.0 T I_p = 800 kA No H-mode RF - D port tripped out again E port ran with one trip ---------------------------------------------------------------------------- 1000523021 bonoli SESSION_LEADER May 23 2000 4:46:28:093PM . . . . . . . . . . . . . . . . . . . . Shot 21 - B_o = 6.0 T flattop - move ICRF resonance to LFS D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 6.0 T I_p = 800 kA Short H-mode RF - D port tripped out again E port had two trips but survived Both D & E seemed well-tuned ---------------------------------------------------------------------------- 1000523022 bonoli SESSION_LEADER May 23 2000 5:04:38:670PM . . . . . . . . . . . . . . . . . . . . Shot 22 - B_o = 6.0 T flattop - move ICRF resonance to LFS D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 6.0 T I_p = 800 kA H-mode with small density rise to nl_04 = 1.4 RF - D port shut down early again E port ran without trips Back off on D-port power from 1.2 to 1.0 MW ---------------------------------------------------------------------------- 1000523023 bonoli SESSION_LEADER May 23 2000 5:25:23:576PM . . . . . . . . . . . . . . . . . . . . Shot 23 - B_o = 6.0 T flattop - move ICRF resonance to LFS D-port: 1.0 MW (reduced from 1.2 MW) E-Port: 0.9 MW Argon turned on. Plasma - B_o = 6.0 T I_p = 800 kA H-mode with small density rise to nl_04 = 1.4 RF - D port tripped out again E port ran without trips We were not able to get enough rf power in at the high field to get rotation measurements, because of problems with D-port. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:10:817PM |
| Author: To Be Determined |
| Physop Summary 1000523 SL G, Bonoli PO Hutch Part 1. Establish good quality H-modes. Part 2. MP 269 ICRF Rotation effects at Lower Field (High-field-side resonance). Summary _______ Both parts of the run were accomplished quite well. H-modes with EDA W_mag practically at the levels of 96-98 campaigns were obtained. Argon was switched off. RF up to 2.7MW was coupled from D and E. Radiated power was about 40%, not great, but tolerable. H/D started below 4% but drifted up to about 5%. ICRF at low fields was obtained. The rotation did not slow down for 4.9T, which places the resonance about 6cm inboard. However, at the lowest fields, 4.5T, sawtooth suppression was observed, and associated peaking of the density. During that period the rotation DID slow down and slightly reverse. Attempts to do the same thing with the resonance on the low-field side, at 6T were thwarted by the D-port failing. There therefore remains some ambiguity about the results that needs more study. Scorecard _________ Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax 1 0.000 0.016 2 0.000 0.034 3 0.000 0.003 4 0.000 0.003 5 0.000 0.009 6 1.948 0.807 7 1.927 1.004 8 1.912 1.012 9 1.950 1.010 10 1.953 1.010 11 1.953 1.010 12 1.950 1.012 13 1.931 0.817 14 1.928 0.815 15 1.922 0.817 16 1.320 0.819 17 1.397 0.816 18 1.927 0.813 19 1.921 0.817 20 1.917 0.817 21 1.915 0.817 22 1.920 0.814 23 1.916 0.814 Finished summary for 1000523 Total of 23 shots. 23 shots. 18 plasmas. 1 fizzles. 4 duds. The Duds were due to power-supply problems. Details. ________ 1000523xxx hutch PHYSICS_OPERATOR May 23 2000 8:45:28:950AM . . . . . . . . . . . . . . . . . . . . Cold Start. Load from 1000517022 nl04 to .9e20. Edit wire window does not disappear on ok! Try to cancel. We get Write whole wire done % Compiled module: WRITE_P_OUTPUT. % XMANAGER: Caught unexpected error from client application. Message follows... % Expression must be a structure in this context: CTX. % Execution halted at: FREE_CTX 345 CMOD$MODELS:[HYBRID.IDL.PCS]EDIT_W IRE.PRO;184 % EDIT_WIRE_EVENT 717 CMOD$MODELS:[HYBRID.IDL.PCS]EDIT_W IRE.PRO;184 % XMANAGER_EVLOOP_STANDARD 471 @IDL_DIR:[LIB]LIB.TLB(XMAN AGER) % XMANAGER 699 @IDL_DIR:[LIB]LIB.TLB(XMANAGER) % PCS 397 CMOD$MODELS:[HYBRID.IDL.PCS]PCS.PR O;83 % $MAIN$ Try to quit. That works. Get out of idl. Redo the whole thing. It works. nl04 is .9e20 set icef to -1270A ---------------------------------------------------------------------------- 1000523001 hutch PHYSICS_OPERATOR May 23 2000 9:13:09:483AM . . . . . . . . . . . . . . . . . . . . Tuesday test. ---------------------------------------------------------------------------- 1000523002 hutch PHYSICS_OPERATOR May 23 2000 9:54:23:763AM . . . . . . . . . . . . . . . . . . . . Fizzle. Bz is way too low, despite the corrections. Breakdown at 4.5ms EFCL current rogowski trace is null. ICEF4 to -1260A from -1270 ---------------------------------------------------------------------------- 1000523005 hutch PHYSICS_OPERATOR May 23 2000 11:00:29:436AM . . . . . . . . . . . . . . . . . . . . Had many struggles with breakers. On this shot a dud because of power supplies. Breakers pulled before t=0. ---------------------------------------------------------------------------- 1000523006 hutch PHYSICS_OPERATOR May 23 2000 11:23:07:920AM . . . . . . . . . . . . . . . . . . . . Plasma. Nice H-mode except for a big injection at 1s. 1MW of RF. 80kJ till the injection hits. Ip to 1.MA. ---------------------------------------------------------------------------- 1000523007 hutch PHYSICS_OPERATOR May 23 2000 11:44:02:576AM . . . . . . . . . . . . . . . . . . . . Plasma. 1.6MW and 2.1MW RF. Bolometer goes up to 1.2MW but stays in H-mode. 150KJ stored energy. EDA. Stored energy apparently is reasonably on the 96098 line. RCUR flattened to .667 to lower the outer gap. ---------------------------------------------------------------------------- 1000523008 hutch PHYSICS_OPERATOR May 23 2000 12:07:16:653PM . . . . . . . . . . . . . . . . . . . . Plasma. Injection at .75s is survived. H-mode lasts from .65 to 1.3s. 16kHz rotation. Loop voltage about .65V Neutron rate to 5e13. 2.7MW RF. 160kJ. This shot shows the very significant impact of the injected impurity on the ECE Te and other performance parameters. Lower nl04 to .8e20 from .9. ---------------------------------------------------------------------------- 1000523009 hutch PHYSICS_OPERATOR May 23 2000 12:28:27:593PM . . . . . . . . . . . . . . . . . . . . Plasma. Injections at .65 and 1.06s. RF trips down to about 1.2MW. Install Bt tweak for ECE. Clearin to -.009 from -.00975 RCUR to .6673 from .667 ---------------------------------------------------------------------------- 1000523010 hutch PHYSICS_OPERATOR May 23 2000 12:52:58:576PM . . . . . . . . . . . . . . . . . . . . Plasma. Injection at .9s. RF is ragged. 140kJ. H to D ratio has crept up to 5%. UP to 14kHz rotation. PG1 to 20ms from 60 (yes 60ms of Ar) but still disabled as per the whole run so far. RCUR to .67 Clearin to -.008 ---------------------------------------------------------------------------- 1000523011 hutch PHYSICS_OPERATOR May 23 2000 1:14:14:216PM . . . . . . . . . . . . . . . . . . . . Plasma. Injections. Enable Ar puff. Install Bt test ramp with point at .75 at 135kA. ---------------------------------------------------------------------------- 1000523012 hutch PHYSICS_OPERATOR May 23 2000 1:39:45:686PM . . . . . . . . . . . . . . . . . . . . Plasma. RF D-port Trips out at .8s. Plasma rotates very fast, 21kHz at .75s. RCUR to .669 Ip to .8MA nl04 to 1e20 TF current to 130kA at .75s. PG1 to 30ms. ---------------------------------------------------------------------------- 1000523013 hutch PHYSICS_OPERATOR May 23 2000 2:03:48:560PM . . . . . . . . . . . . . . . . . . . . Plasma. Long H-mode, no injections. Got down ot 4.8T. Goes ELM-free when the RF power drops. Sawtooth rotation at about 14kHz throughout. Flatten Bt. Ar puff to 40ms. ---------------------------------------------------------------------------- 1000523014 hutch PHYSICS_OPERATOR May 23 2000 2:24:42:873PM . . . . . . . . . . . . . . . . . . . . Plasma.2 MW 96kJ. Loop voltage .67V. On RF step down the PCI fluctuations show a major speed up of the quasi-coherent mode, but it does not entirely disappear. ICEF4 to -1265 from -1260. Bt to 135kA. ---------------------------------------------------------------------------- 1000523015 hutch PHYSICS_OPERATOR May 23 2000 2:44:59:123PM . . . . . . . . . . . . . . . . . . . . Plasma. Injection into the early H-mode. The radiation level never quite comes back down. Bt current to 125KA. ---------------------------------------------------------------------------- 1000523016 hutch PHYSICS_OPERATOR May 23 2000 3:09:06:043PM . . . . . . . . . . . . . . . . . . . . Plasma. Disrupts at 1.32s. A strange positional event just prior to that, when it drops out of H-mode. This H-mode is nearly ELM-free. There is a continuous density ramp. Eventually at 1.2s the sawteeth are suppressed. Also there is a continuous slowing of the rotation from about .85s to near zero at 1.05s. Density peaks very strongly on axis. Central Thomson Te is very low. This is an extremely interesting shot. Repeat. ---------------------------------------------------------------------------- 1000523017 hutch PHYSICS_OPERATOR May 23 2000 3:31:50:936PM . . . . . . . . . . . . . . . . . . . . Plasma. Big injection at .76s. Disrupts at 1.38s. Rather similar to previous shot but not such a high density. Rotation spins down. Ramp field down faster and up slower. ---------------------------------------------------------------------------- 1000523018 hutch PHYSICS_OPERATOR May 23 2000 3:52:06:966PM . . . . . . . . . . . . . . . . . . . . Plasma. No disruption. Sawteeth Install ramp up to 167kA. ---------------------------------------------------------------------------- 1000523019 hutch PHYSICS_OPERATOR May 23 2000 4:17:06:500PM . . . . . . . . . . . . . . . . . . . . Plasma. 5.9T. Only .8MW. Not much H-mode. Breakdown a bit late. ICEF4 to -1275A ---------------------------------------------------------------------------- 1000523020 hutch PHYSICS_OPERATOR May 23 2000 4:33:58:123PM . . . . . . . . . . . . . . . . . . . . Plasma. Low RF power again. Repeat ---------------------------------------------------------------------------- 1000523021 hutch PHYSICS_OPERATOR May 23 2000 4:58:53:716PM . . . . . . . . . . . . . . . . . . . . Plasma. RF still trips out quite soon. Rcur to .67 from .669m ---------------------------------------------------------------------------- 1000523022 hutch PHYSICS_OPERATOR May 23 2000 5:20:56:733PM . . . . . . . . . . . . . . . . . . . . Plasma. H-mode stays, but power only .9MW because D-port trips. Amazingly slow edge rotation. -6km/s. Lower the power a bit to try to keep RF on. ---------------------------------------------------------------------------- 1000523023 hutch PHYSICS_OPERATOR May 23 2000 5:23:11:450PM . . . . . . . . . . . . . . . . . . . . Plasma. Rather similar to the previous. |
| Session Leader Comments | |||
| May 23 2000 09:04:51:733AM | Martin Greenwald | For the first part of the run we will be bringing up RF power after repairing arc damage in the E-antenna feed system. At the same time we will establish a baseline for H-mode confinement. Run "best" case scenario: H/D < 5%, Prf_D+Prf_E > 2.5 MW (steady) , Prf_J = 0, Ip = 1 MA. This will provide a baseline for comparison with our best shots from previous campaigns. | |
| May 23 2000 09:11:13:343AM | 1000523001 | Paul Bonoli | Shot 1 - OH Coax test No plasma |
| May 23 2000 09:33:37:670AM | 1000523002 | Paul Bonoli | Shot 2 - D-port 0.5 MW E-port 0.5 MW Plasma - fizzle |
| May 23 2000 10:18:14:827AM | 1000523003 | Paul Bonoli | Shot 3 - No plasma Test Shot |
| May 23 2000 10:24:35:013AM | 1000523004 | Paul Bonoli | Shot 4 - Breaker fault - no shot. |
| May 23 2000 10:35:23:390AM | 1000523005 | Paul Bonoli | Shot 5 - Dud |
| May 23 2000 11:07:59:140AM | 1000523006 | Paul Bonoli | Shot 6 - D-port: 0.5 MW E-port: 0.5 MW Plasma -> B_o = 5.3 T, I_p = 800 kA H-mode -> nl_04 = 1.5 X 10^20, H-factor = 1.5 RF -> D - 0.6 MW E - 0.5 MW |
| May 23 2000 11:10:22:420AM | 1000523006 | Martin Greenwald | First plasma of day Ip = 0.8 MA H-mode with 1 MW of RF EDA with H ~ 1.5 Until injection, Prad/Ptot ~ 0.44 H/D ~ 3% |
| May 23 2000 11:32:40:357AM | 1000523007 | Martin Greenwald | Good shot 1 MA, 2 MW RF, 2.4 MW total EDA H-mode with .15 MJ H ~ 1.8 stored energy right on nominal curve may be the best h-mode since 1998 H/D ~ 3-4% |
| May 25 2000 10:20:03:090AM | 1000523007 | Paul Bonoli | Shot 7 - D-port: (0.75 - 1.0) MW step E-port: (0.75 - 1.0) MW step Plasma -> B_o = 5.3 T, I_p = 1000 kA H-mode -> EDA with nl_04 = 1.84 X 10^20 H_factor rises to 2.0 then drops to 1.8 during steady state ! RF -> D & E ran well to 2.0 MW total ! |
| May 23 2000 12:02:30:530PM | 1000523008 | Paul Bonoli | Shot 6 - D-port: 1.25 MW E-port: 1.25 MW Plasma -> B_o = 5.3 T, I_p = 1000 kA H-mode -> EDA with nl_04 = 1.85 X 10^20 RF -> D ran with a trip at 1.3 s E ran with multiple trips at 0.72 s D&E total power coupled about 2.7 MW |
| May 23 2000 12:57:30:170PM | 1000523008 | Martin Greenwald | Another good shot an injection right at the beginning of the H-mode may be spoiling things a bit best stored energy only recovered after about 0.4 secs when prad drops below 50% Prf = 2.6 MW; Ptot = 3 MW W = .16 MJ H/D ratio to 4.5% H reaches about 1.8 |
| May 23 2000 12:11:48:467PM | 1000523009 | Martin Greenwald | much lower rf power ~ 1.5 MW numerous impurity injections |
| May 23 2000 12:16:25:937PM | 1000523009 | Paul Bonoli | Shot 9 - D-port: 1.25 MW E-port: 1.25 MW Plasma -> B_o = 5.3 T, I_p = 1000 kA H-mode -> Two H-modes RF -> D ran ok with 1 trip E - had arc and voltage limit trips - shut down after 0.8 s Back off on E-port power |
| May 23 2000 12:36:03:920PM | 1000523010 | Paul Bonoli | Shot 10 - D-port: 1.25 MW E-port: Reduced power to 1.10 MW Plasma -> B_o = 5.3 T, I_p = 1000 kA H-mode -> Two H-mode phases with H_factor = 1.5 and nl_04 = 1.8 RF -> D & E have multiple trips with maximum ICRF power of 2.5 MW |
| May 23 2000 12:37:21:123PM | 1000523010 | Martin Greenwald | ragged RF and occasional injections average total power was still above 2.5 MW for most of the pulse stored energy only reached .14 MJ |
| May 25 2000 10:27:17:653AM | 1000523011 | Paul Bonoli | Shot 11 - Start toroidal rotation mini-proposal D-port: 1.40 MW E-Port: 1.10 MW Reduce gap Argon turned on ! Plasma - B_o ramp from (5.3 - 4.9 - 5.4) T I_p = 1000 kA Three H-mode phases with nl_04 = 1.6 - 1.8 Rf - trips in D & E, but not fatal Reduce ICRF power on next shot to eliminate rf trips. |
| May 25 2000 10:29:40:483AM | 1000523012 | Paul Bonoli | Shot 12 - Reduce ICRF power D-port: 1.1 MW E-Port: 0.9 MW Reduce plasma - antenna gap Argon turned on ! Plasma - B_o ramp from (5.3 - 4.9 - 5.4) T I_p = 1000 kA H-modes with nl_04 = 1.7-1.8 Rf - D has trips - fatal E has trips but survives Raise density next shot |
| May 23 2000 01:47:18:170PM | 1000523013 | Paul Bonoli | Shot 13 - Reduce I_p to 800 kA, incease density D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o ramp from (5.3 - 4.9 - 5.4)T I_p = 800 kA H-mode with nl_04 = 1.5 RF - D & E much better - few trips 2 MW max. ICRF power |
| May 25 2000 10:35:03:903AM | 1000523014 | Paul Bonoli | Shot 14 - Use flattop B_o pulse (5.3 T) ICRF resonance is 0.47 cm to the LFS D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 5.3 T I_p = 800 kA Good EDA H-mode with nl_04 = 1.5 RF - D & E ran without trips - 2 MW coupled HIREX measuring plasma rotating in the co-direction. Reduce B_o to 4.9 T next shot |
| May 25 2000 10:33:11:340AM | 1000523015 | Paul Bonoli | Shot 15 - B_o = 4.88T with flattop ICRF resonance is 4.9 cm to the HFS. D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 4.88T I_p = 800 kA Good EDA H-mode with nl_04 = 1.5 RF - D & E ran without trips - 2 MW coupled HIREX shows plasma still rotating in the co-current direction. |
| May 25 2000 10:37:29:030AM | 1000523016 | Paul Bonoli | Shot 16 - B_o = 4.53T with flattop ICRF resonance is now 9.3 cm to the HFS. D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 4.53T, I_p = 800 kA ELM-free H-mode - nl_04 = 2.0 Plasma terminates with a density collapse RF - D & E ran without trips - 2 MW Off-axis ICRF heating is leading to hollow T_e profiles (?) Some evidence from John's HIREX that rotation reversed ???? Sawteeth stabilized at 1.2 s per IHH |
| May 25 2000 10:39:00:700AM | 1000523017 | Paul Bonoli | Shot 17 - Run B_o = 4.53T with flattop again D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 4.53T, I_p = 800 kA ELM-free H-mode Plasma terminates with a disruption again RF - D (1 trip) & E(no trips) - 2 MW Plasma rotation "slows" down and reverses sign again, per HIREX. Plasma T_e profiles are hollow with sawteeth stabilized. |
| May 25 2000 10:40:23:827AM | 1000523018 | Paul Bonoli | Shot 18 - Start 4.5 T flattop earlier D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 4.53T, I_p = 800 kA H-mode with nl_04 = 1.8 No disruption RF - D & E ran without trips HIREX still show a "sign reversal" in rotation No sawtooth stabilization observed on this shot. Go to 6.0 T next shot to attempt to separate out effect on rotation of off-axis heating. |
| May 25 2000 10:41:22:013AM | 1000523019 | Paul Bonoli | Shot 19 - B_o = 6.0 T flattop - move ICRF resonance to 9.4 cm on the LFS D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 6.0 T I_p = 800 kA No H-mode RF - D tripped out E ran with one trip Take 6.0 T shot again |
| May 23 2000 04:19:30:543PM | 1000523020 | Paul Bonoli | Shot 20 - B_o = 6.0 T flattop - move ICRF resonance to LFS D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 6.0 T I_p = 800 kA No H-mode RF - D port tripped out again E port ran with one trip |
| May 23 2000 04:46:28:093PM | 1000523021 | Paul Bonoli | Shot 21 - B_o = 6.0 T flattop - move ICRF resonance to LFS D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 6.0 T I_p = 800 kA Short H-mode RF - D port tripped out again E port had two trips but survived Both D & E seemed well-tuned |
| May 23 2000 05:04:38:670PM | 1000523022 | Paul Bonoli | Shot 22 - B_o = 6.0 T flattop - move ICRF resonance to LFS D-port: 1.1 MW E-Port: 0.9 MW Argon turned on. Plasma - B_o = 6.0 T I_p = 800 kA H-mode with small density rise to nl_04 = 1.4 RF - D port shut down early again E port ran without trips Back off on D-port power from 1.2 to 1.0 MW |
| May 23 2000 05:25:23:577PM | 1000523023 | Paul Bonoli | Shot 23 - B_o = 6.0 T flattop - move ICRF resonance to LFS D-port: 1.0 MW (reduced from 1.2 MW) E-Port: 0.9 MW Argon turned on. Plasma - B_o = 6.0 T I_p = 800 kA H-mode with small density rise to nl_04 = 1.4 RF - D port tripped out again E port ran without trips We were not able to get enough rf power in at the high field to get rotation measurements, because of problems with D-port. |
| Physics Operator Comments | |||
| May 23 2000 08:45:28:950AM | Ian Hutchinson | Cold Start. Load from 1000517022 nl04 to .9e20. Edit wire window does not disappear on ok! Try to cancel. We get Write whole wire done % Compiled module: WRITE_P_OUTPUT. % XMANAGER: Caught unexpected error from client application. Message follows... % Expression must be a structure in this context: CTX. % Execution halted at: FREE_CTX 345 CMOD$MODELS:[HYBRID.IDL.PCS]EDIT_W IRE.PRO;184 % EDIT_WIRE_EVENT 717 CMOD$MODELS:[HYBRID.IDL.PCS]EDIT_W IRE.PRO;184 % XMANAGER_EVLOOP_STANDARD 471 @IDL_DIR:[LIB]LIB.TLB(XMAN AGER) % XMANAGER 699 @IDL_DIR:[LIB]LIB.TLB(XMANAGER) % PCS 397 CMOD$MODELS:[HYBRID.IDL.PCS]PCS.PR O;83 % $MAIN$ Try to quit. That works. Get out of idl. Redo the whole thing. It works. nl04 is .9e20 set icef to -1270A | |
| May 23 2000 09:13:09:483AM | 1000523001 | Ian Hutchinson | Tuesday test. |
| May 23 2000 09:54:23:763AM | 1000523002 | Ian Hutchinson | Fizzle. Bz is way too low, despite the corrections. Breakdown at 4.5ms EFCL current rogowski trace is null. ICEF4 to -1260A from -1270 |
| May 23 2000 11:00:29:437AM | 1000523005 | Ian Hutchinson | Had many struggles with breakers. On this shot a dud because of power supplies. Breakers pulled before t=0. |
| May 23 2000 11:23:07:920AM | 1000523006 | Ian Hutchinson | Plasma. Nice H-mode except for a big injection at 1s. 1MW of RF. 80kJ till the injection hits. Ip to 1.MA. |
| May 23 2000 11:44:02:577AM | 1000523007 | Ian Hutchinson | Plasma. 1.6MW and 2.1MW RF. Bolometer goes up to 1.2MW but stays in H-mode. 150KJ stored energy. EDA. Stored energy apparently is reasonably on the 96098 line. RCUR flattened to .667 to lower the outer gap. |
| May 23 2000 12:07:16:653PM | 1000523008 | Ian Hutchinson | Plasma. Injection at .75s is survived. H-mode lasts from .65 to 1.3s. 16kHz rotation. Loop voltage about .65V Neutron rate to 5e13. 2.7MW RF. 160kJ. This shot shows the very significant impact of the injected impurity on the ECE Te and other performance parameters. Lower nl04 to .8e20 from .9. |
| May 23 2000 12:28:27:593PM | 1000523009 | Ian Hutchinson | Plasma. Injections at .65 and 1.06s. RF trips down to about 1.2MW. Install Bt tweak for ECE. Clearin to -.009 from -.00975 RCUR to .6673 from .667 |
| May 23 2000 12:52:58:577PM | 1000523010 | Ian Hutchinson | Plasma. Injection at .9s. RF is ragged. 140kJ. H to D ratio has crept up to 5%. UP to 14kHz rotation. PG1 to 20ms from 60 (yes 60ms of Ar) but still disabled as per the whole run so far. RCUR to .67 Clearin to -.008 |
| May 23 2000 01:14:14:217PM | 1000523011 | Ian Hutchinson | Plasma. Injections. Enable Ar puff. Install Bt test ramp with point at .75 at 135kA. |
| May 23 2000 01:39:45:687PM | 1000523012 | Ian Hutchinson | Plasma. RF D-port Trips out at .8s. Plasma rotates very fast, 21kHz at .75s. RCUR to .669 Ip to .8MA nl04 to 1e20 TF current to 130kA at .75s. PG1 to 30ms. |
| May 23 2000 02:03:48:560PM | 1000523013 | Ian Hutchinson | Plasma. Long H-mode, no injections. Got down ot 4.8T. Goes ELM-free when the RF power drops. Sawtooth rotation at about 14kHz throughout. Flatten Bt. Ar puff to 40ms. |
| May 23 2000 02:24:42:873PM | 1000523014 | Ian Hutchinson | Plasma.2 MW 96kJ. Loop voltage .67V. On RF step down the PCI fluctuations show a major speed up of the quasi-coherent mode, but it does not entirely disappear. ICEF4 to -1265 from -1260. Bt to 135kA. |
| May 23 2000 02:44:59:123PM | 1000523015 | Ian Hutchinson | Plasma. Injection into the early H-mode. The radiation level never quite comes back down. Bt current to 125KA. |
| May 23 2000 03:09:06:043PM | 1000523016 | Ian Hutchinson | Plasma. Disrupts at 1.32s. A strange positional event just prior to that, when it drops out of H-mode. This H-mode is nearly ELM-free. There is a continuous density ramp. Eventually at 1.2s the sawteeth are suppressed. Also there is a continuous slowing of the rotation from about .85s to near zero at 1.05s. Density peaks very strongly on axis. Central Thomson Te is very low. This is an extremely interesting shot. Repeat. |
| May 23 2000 03:31:50:937PM | 1000523017 | Ian Hutchinson | Plasma. Big injection at .76s. Disrupts at 1.38s. Rather similar to previous shot but not such a high density. Rotation spins down. Ramp field down faster and up slower. |
| May 23 2000 03:52:06:967PM | 1000523018 | Ian Hutchinson | Plasma. No disruption. Sawteeth Install ramp up to 167kA. |
| May 23 2000 04:17:06:500PM | 1000523019 | Ian Hutchinson | Plasma. 5.9T. Only .8MW. Not much H-mode. Breakdown a bit late. ICEF4 to -1275A |
| May 23 2000 04:33:58:123PM | 1000523020 | Ian Hutchinson | Plasma. Low RF power again. Repeat |
| May 23 2000 04:58:53:717PM | 1000523021 | Ian Hutchinson | Plasma. RF still trips out quite soon. Rcur to .67 from .669m |
| May 23 2000 05:20:56:733PM | 1000523022 | Ian Hutchinson | Plasma. H-mode stays, but power only .9MW because D-port trips. Amazingly slow edge rotation. -6km/s. Lower the power a bit to try to keep RF on. |
| May 23 2000 05:23:11:450PM | 1000523023 | Ian Hutchinson | Plasma. Rather similar to the previous. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:07:25:653AM | Test | Ok | OH coax test shot |
| 2 | 09:27:44:170AM | Plasma | Ok | |
| 3 | 09:55:54:123AM | Test | Ok | camac cycle test shot only |
| 4 | 10:18:55:030AM | Plasma | Bad | EF1 Type 1 FLT at end of Check State |
| 5 | 10:31:17:687AM | Plasma | Bad | OH2 L Type 1 Fault |
| 6 | 10:58:39:357AM | Plasma | Ok | |
| 7 | 11:21:16:043AM | Plasma | Ok | |
| 8 | 11:42:38:107AM | Plasma | Ok | |
| 9 | 12:05:47:670PM | Plasma | Ok | |
| 10 | 12:29:18:357PM | Plasma | Ok | |
| 11 | 12:51:24:217PM | Plasma | Ok | |
| 12 | 01:12:33:670PM | Plasma | Ok | |
| 13 | 01:37:51:140PM | Plasma | Ok | |
| 14 | 02:01:59:623PM | Plasma | Ok | |
| 15 | 02:22:37:670PM | Plasma | Ok | |
| 16 | 02:42:27:980PM | Plasma | Ok | |
| 17 | 03:10:00:373PM | Plasma | Ok | |
| 18 | 03:30:06:840PM | Plasma | Ok | |
| 19 | 03:50:37:077PM | Plasma | Ok | |
| 20 | 04:13:33:717PM | Plasma | Ok | |
| 21 | 04:35:17:873PM | Plasma | Ok | |
| 22 | 04:56:53:327PM | Plasma | Ok | |
| 23 | 05:19:02:653PM | Plasma | Ok | |