| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Yijun Lin |
| Physics operator(s): | Dmitri Mossessian |
| Engineering operator(s): | Unknown |
| Engineering Operator Run Comment |
| MP#376--- Study of the Efficiency of ICRF Minority Heating and Investiga |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:35:227PM |
| Author: Yijun Lin |
Run summary: MP376, part 1. RF efficiency and plasma performance study Scans on outer gap, upper triangularity, and lower triangularity was done to figure out whether these parameters do matter. *Summary on outer gap scan (shots 2, 3, 6, 8). Insensitive *Summary on delta_u scan: Plasma performance is rather insensitive to delta_u from 0.3 to 0.5 (shot 10, 12, 13). A larger delta_u produces plasmas more EDA like. A very small delta_u = 0.2 get a slightly lower performance plasma (shot 18). *Summary on delta_l scan (shot 19, 20, 21, 23, 24, 25, 26, 28, 11). Generally, larger delta_l produces H-modes more EDA-like. H-modes with larger delta_l also tend to have lower stored energy. The max stored energy obtained was in shot 23 at delta_l = 0.45, which is about the smallest delta_l we can go safely. *Summary on power scan: shot 23, 30, 32, 33 The result is inconclusive. It seems the max stored energy is sensitive to rf trips; unfortunately, we were not able to run clean rf at 5 MW level (30, 32). More scan will be performed tomorrow. Generally, the plasma performance is better than the norm in year 2002 and 2003 campaign. 4 MW, W~170 kJ are routinely obtained in many different shapes. |
| Physics Operator Summaries |
| Session Leader Comments | |||
| Dec 9 2003 05:06:02:987PM | Yijun Lin | Run summary: Run summary: MP376, part 1. RF efficiency and plasma performance study Scans on outer gap, upper triangularity, and lower triangularity was done to figure out whether these parameters do matter. *Summary on outer gap scan (shots 2, 3, 6, 8). Insensitive *Summary on delta_u scan: Plasma performance is rather insensitive to delta_u from 0.3 to 0.5 (shot 10, 12, 13). A larger delta_u produces plasmas more EDA like. A very small delta_u = 0.2 get a slightly lower performance plasma (shot 18). *Summary on delta_l scan (shot 19, 20, 21, 23, 24, 25, 26, 28, 11). Generally, larger delta_l produces H-modes more EDA-like. H-modes with larger delta_l also tend to have lower stored energy. The max stored energy obtained was in shot 23 at delta_l = 0.45, which is about the smallest delta_l we can go safely. *Summary on power scan: shot 23, 30, 32, 33 The result is inconclusive. It seems the max stored energy is sensitive to rf trips; unfortunately, we were not able to run clean rf at 5 MW level (30, 32). More scan will be performed tomorrow. Generally, the plasma performance is better than the norm in year 2002 and 2003 campaign. 4 MW, W~170 kJ are routinely obtained in many different shapes. | |
| Dec 9 2003 10:27:21:457AM | 1031209001 | Yijun Lin | Shot 01 Load 1031205021 Fiducial shot. 1 MA. nl04 = 0.8e20 m^-2 Kappa = 1.7, right gap 0.8, delta_l = 0.56, delta_u= 0.29 RF step up 2, 3, 4 MW. Good shot. Wmhd to 186 kJ at 3.5 MW rf. D-port did not fire. A problem in the control system. No modulator output. Run without D port. Start outgap scan at 3.6 MW level. |
| Dec 9 2003 09:49:40:313AM | 1031209002 | Yijun Lin | Shot 02: Same plasma as shot 01. Outer gap = 1 cm at H-modes. delta_l = 0.56, delta_u= 0.29 RF at 3.6 MW (E + J) Wmax = 187 kJ. Next: larger outer gap. |
| Dec 9 2003 10:38:34:733AM | 1031209003 | Yijun Lin | Shot 03: Same plasma as shot 01. Outer gap = 1.5 cm at H-modes. delta_l = 0.56, delta_u= 0.29 RF at 3.6 MW. Wmax = 174 kJ in the First H-mode. Next: more outer gap |
| Dec 9 2003 10:18:52:520AM | 1031209004 | Yijun Lin | Disrupted @ 0.83 sec. A problem in density feedback. |
| Dec 9 2003 10:37:56:627AM | 1031209005 | Yijun Lin | shot 05: No power shot. OH2 problema. |
| Dec 9 2003 11:03:32:503AM | 1031209007 | Yijun Lin | shot 07: Plasma. Run-away. Ultra-low density (1.e19). |
| Dec 9 2003 01:44:00:593PM | 1031209008 | Yijun Lin | shot 08: Programed E port [0.6, 1.2] sec. J port [0.6, 1.3] sec. So dW/dt may be done at 1.2 sec. Outer gap = 1 cm in H-modes.(it is evolving. Average about 0.8 cm) delta_l = 0.56, delta_u= 0.29 RF at 3.6 MW. Wmax = 183kJ in the 1st H-mode, 177 kJ 3rd H-modes. Summary on outer gap scan: At large outer gap, Wmax is similar, but later H-modes become much worse than the first one. (shot 2, 3, 6, 8) Next: start delta_u scan. Repeat shot 2 with all antennas. |
| Dec 9 2003 11:41:51:053AM | 1031209009 | Yijun Lin | Shot 09: Repeat shot 02. With D, E and J antennas (demand 0.9 MW each transmitter) E port has two notches at 0.8 sec and 1.1 sec. Outer gap = 1 cm, delta_l = 0.56 delta_u = 0.3 Only 3 MW. D port has phase balance faults. (by-passed for the next shot). Wmax ~ 160 kJ. Density to 0.9 e20 to get H-modes more EDA like. |
| Dec 9 2003 11:49:11:097AM | 1031209010 | Yijun Lin | Shot 10: Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.9 MW each transmitter) E port has two notches at 0.8 sec and 1.1 sec. Outer gap = 1 cm, delta_l = 0.56 delta_u = 0.3 Prf = 4 MW. Wmax ~ 173 kJ (1st H-mode) Wmax ~ 177 kJ (2nd H-mode) Next: run delta_u ~ 0.4 |
| Dec 9 2003 12:05:59:777PM | 1031209011 | Yijun Lin | Shot 11: Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.9 MW each transmitter) E port has two notches at 0.8 sec and 1.1 sec. Request: Outer gap = 1 cm, delta_l = 0.56 delta_u = 0.4 PO mistake. Got delta_l = 0.7, delta_u = 0.29 Prf = 4 MW. Wmax ~ 152 kJ H factor ~ 1.0 Next: run delta_u ~ 0.4, delta_l = 0.56 |
| Dec 9 2003 12:36:35:423PM | 1031209013 | Yijun Lin | Shot 13: Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.9 MW each transmitter) E port has two notches at 0.8 sec and 1.1 sec. Outer gap = 1 cm, delta_l = 0.56 delta_u = 0.5 Prf = 4 MW. Wmax ~ 172 kJ (1st H-mode) Wmax ~ 190 kJ (2nd H-mode) (Delta_u was going down in the 2nd H-mode) Next: delta_u = 0.65 |
| Dec 9 2003 01:02:23:300PM | 1031209015 | Yijun Lin | Shot 15: Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.9 MW from each transmitter) E port has two notches at 0.8 sec and 1.1 sec. Outer gap = 1 cm, delta_l = 0.56 delta_u = 0.55 Plasma was innerwall limited. Prf = 2 MW. No J port power. Unknown reason. Fine in dummy load tests. Wmax ~ 114 kJ (Long innerwall limited EDA H-mode?), H-factor ~ 1.5 |
| Dec 9 2003 01:09:39:723PM | 1031209016 | Yijun Lin | Shot 16: Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.9 MW from each transmitter) E port has two notches at 0.8 sec and 1.1 sec. Outer gap = 1 cm, delta_l = 0.56 delta_u = 0.65 Prf = 4 MW. Wmax ~ 156 kJ Disrupted at 0.82 sec. Still goes limited. H factor ~ 1.7 Next: try delta_u ~ 0.2. |
| Dec 9 2003 01:25:01:213PM | 1031209017 | Yijun Lin | Shot 17: Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.9 MW from each transmitter) E port has two notches at 0.8 sec and 1.1 sec. Outer gap = 1 cm, delta_l = 0.56 delta_u = 0.25 Prf ~ 1 MW. Density control problems. No H-mode |
| Dec 9 2003 01:56:34:007PM | 1031209018 | Yijun Lin | Shot 18: Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.9 MW from each transmitter) E port has two notches at 0.8 sec and 1.1 sec. Outer gap = 1 cm, delta_l = 0.56 delta_u = 0.22 Prf = 4 MW. Wmax ~ 154 kJ, H factor < 1.5 Summary on delta_u scan: Plasma performance is rather insensitive to delta_u from 0.3 to 0.5 (shot 10, 12, 13). A larger delta_u produces plasmas more EDA like. A very small delta_u = 0.2 get a lower performance plasma (shot 18). (compared with shot 19. it seems the lower performance in shot 18 might not be due to the delta_u change). Next: Start delta_l scan. Repeat shot 10 to be sure we are getting the same plasma performance. |
| Dec 9 2003 01:59:23:837PM | 1031209019 | Yijun Lin | shot 19: repeat shot 10 Ip: 1 MA, nl04: 0.96e20 m^-2 With D, E and J antennas (demand 0.9 MW from each transmitter) E port has two notches at 0.8 sec and 1.1 sec. Outer gap = 1 cm, delta_l = 0.56 delta_u = 0.3 Prf = 4 MW. Wmax ~ 160 kJ H factor 1.5. (density is a little bit higher than shot 10). Next: smaller delta_l. |
| Dec 9 2003 02:12:54:467PM | 1031209020 | Yijun Lin | shot 20: Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.9 MW from each transmitter) E port has two notches at 0.8 sec and 1.1 sec. Outer gap = 1 cm, delta_u = 0.3 delta_l = 0.5 Prf = 4 MW. Wmax ~ 177kJ, H factor 1.7. (Better than shot 19) Next: lower delta_l more. |
| Dec 9 2003 02:33:18:973PM | 1031209022 | Yijun Lin | fizzle |
| Dec 9 2003 02:48:42:997PM | 1031209023 | Yijun Lin | Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.9 MW from each transmitter) E port has two short notches at 0.88 sec and 1.2 sec. Outer gap = 1 cm, delta_u = 0.3 delta_l = 0.45 Prf = 4 MW. Wmax ~ 186 kJ, H factor max at 2, then comes down with radiation. The Hmodes are less EDA like. Next: repeat shot 20. With shortened E port notch to see how high we can get on stored energy. |
| Dec 9 2003 02:59:44:233PM | 1031209024 | Yijun Lin | shot 24: Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.9 MW from each transmitter) E port has two short notches at 0.88 sec and 1.2 sec. Outer gap = 1 cm, delta_u = 0.3 delta_l = 0.50 Prf = 4 MW. Wmax ~ 175 kJ, H factor 1.7 W starts rolling over while J-port faulted. Next: the same plasma. Slightly lower J power to let it stay on. |
| Dec 9 2003 03:30:12:353PM | 1031209026 | Yijun Lin | shot 26: Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 1.1 MW from D and E, 1.4 MW from J) E port has two short notches at 0.88 sec and 1.2 sec. Outer gap = 1 cm, delta_u = 0.3 delta_l = 0.50 Prf = 4 MW. Wmax ~ 174 kJ, H factor 1.7 Long EDA, but Wmhd droops. Next: delta_l = 0.6. Set all antennas equal power again. |
| Dec 9 2003 03:50:30:270PM | 1031209028 | Yijun Lin | shot 28: Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.9 MW from each transmitter) E port has two short notches at 0.88 sec and 1.2 sec. Outer gap = 1 cm, delta_u = 0.3 delta_l = 0.6 Prf = 4 MW. Wmax ~ 146 kJ Summary on delta_l scan (shot 19, 20, 21, 23, 24, 25, 26, 28, 11). Generally, larger delta_l produces H-modes more EDA-like. H-modes with larger delta_l also tend to have lower stored energy. The max stored energy obtained was in shot 23 at delta_l = 0.45, which is about the smallest delta_l we can go safely. Next power scan at the best shape (shot 23). |
| Dec 9 2003 03:58:23:367PM | 1031209029 | Yijun Lin | fizzle |
| Dec 9 2003 04:18:46:530PM | 1031209030 | Yijun Lin | Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 1.15 MW from D and E, 2.2 MW from J) E port has two short notches at 0.88 sec and 1.2 sec. Outer gap = 1 cm, delta_u = 0.3 delta_l = 0.46 Prf = 5 MW. Wmax ~ 150 kJ. RF faulted at 0.67 sec. Wmhd was still rising before rf faults. Next: same plasma. Lower J power. Raise D and E power. |
| Dec 9 2003 04:29:07:753PM | 1031209030 | Yijun Lin | shot 31: No power shot. Hung during INIT. |
| Dec 9 2003 04:53:46:683PM | 1031209032 | Yijun Lin | shot 32: Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 1.2 MW from D and E, 2. MW from J) E port has two short notches at 0.88 sec and 1.2 sec. Outer gap = 1 cm, delta_u = 0.3 delta_l = 0.46 Prf = 4.8 MW. Wmax ~ 173 kJ. Next: try 3 MW Prf. |
| Dec 9 2003 04:54:04:823PM | 1031209033 | Yijun Lin | shot 33: Ip: 1 MA, nl04: 0.9e20 m^-2 With D, E and J antennas (demand 0.7 MW from each transmitter) E port has two short notches at 0.88 sec and 1.2 sec. Outer gap = 1 cm, delta_u = 0.3 delta_l = 0.46 Prf = 3.1 MW. Wmax ~ 140 kJ. Next Try 5 MW again. |
| Dec 9 2003 05:05:08:313PM | 1031209034 | Yijun Lin | fizzle |
| Physics Operator Comments | |||
| Dec 9 2003 09:00:35:223AM | Dmitri Mossessian | Wolfe filling in for Dmitri for first shot. Per SL request loaded 1031205021 which has different gaps from Friday's fiducial. Dmitri is back. Loaded 1031205021 (Steve reloaded it). Plan: MP#376 --- Study of the Efficiency of ICRF Minority Heating and Investigation of the Cause of Low H-mode Plasma Performance Scan plasma shape 1. outer gap scan (0.5,1.,1.5,2.0 cm) with fixed triangularity 2. scan upper triangularity (0.05,.15,.25,.35,.45,.6) with fixed lower triangularity and gap 3. scan lower triangularity with fixed upper triangularity and gap With identified best shape perform power scan - 2.5, 4, 5.5 MW Scan plasma current for fixed power (Prf ~ 4 MW) 1. for best performing shape scan plasma current (0.6,0.8,1.0,1.2 MA) 2. for poorest performing shape scan plasma current (0.6,0.8,1.0,1.2 MA) Antenna comparison in H-mode 1. D, E, and J-port at 1 MW each, J-port at 3 MW 2. D and E at 3.0 MW, J-port at 3.0 MW He plasma comparison 1. Fiducial discharge in He for all discharges except the fiducial a programmed RF transition will occur at 1.2 sec | |
| Dec 9 2003 09:04:52:880AM | 1031209001 | Dmitri Mossessian | Plasma. Startup looks OK. PLC fault - lost communication with TORVAC. Next shot - no PCS changes |
| Dec 9 2003 09:50:31:050AM | 1031209002 | Dmitri Mossessian | Plasma. Next shot: Right gap 0.5 cm larger - RCUR 0.666 -> 0.6635 |
| Dec 9 2003 10:05:06:730AM | 1031209003 | Dmitri Mossessian | Plasma. Next shot: Right gap 0.5 cm larger - RCUR 0.635 -> 0.661 |
| Dec 9 2003 10:18:42:460AM | 1031209004 | Dmitri Mossessian | Plasma. Disrupted at 0.82 sec - problems with density feedback because of a fringe jump at the beginning of the shot, the gas was shut off fro the whole shot. Next shot: repeat |
| Dec 9 2003 10:28:20:113AM | 1031209005 | Dmitri Mossessian | No power shot. OH2 problems |
| Dec 9 2003 11:15:36:953AM | 1031209007 | Dmitri Mossessian | Plasma. No density feedback after 0.2 sec - we got 8e18 m^-3 at 1 sec. Next shot: TCI may be fixed. We'll try again. |
| Dec 9 2003 11:23:36:763AM | 1031209008 | Dmitri Mossessian | Plasma. TCI is Ok Next shot: go to right gap from shot 2 - RCUR to 0.666 |
| Dec 9 2003 11:38:56:070AM | 1031209009 | Dmitri Mossessian | Plasma. Next shot: go to target nl 0.9e20 |
| Dec 9 2003 11:56:41:907AM | 1031209010 | Dmitri Mossessian | Plasma. Traces of QC mode. Next shot: raise upper triangularity RXL 0 -> -.02 |
| Dec 9 2003 12:04:32:683PM | 1031209011 | Dmitri Mossessian | Plasma. Changed lower delta instead of upper. Next shot: RXL back to 0. RXU decreased by 2 cm |
| Dec 9 2003 12:18:32:507PM | 1031209012 | Dmitri Mossessian | Plasma. Good shot - EDA with small ELMs at 180 kJ max W Next shot: Raise upper delta - RXU decreased by 2 cm |
| Dec 9 2003 12:32:16:750PM | 1031209013 | Dmitri Mossessian | Plasma. Next shot: RXU decreased by 1 cm |
| Dec 9 2003 12:49:51:010PM | 1031209014 | Dmitri Mossessian | Plasma. Goes limited because upper x-point is not at the right place Next shot: ZXU decreased by 2 cm |
| Dec 9 2003 12:57:34:610PM | 1031209015 | Dmitri Mossessian | Plasma. Goes limited again, but seems to be changed in the right direction. Wolfe taking over for a shot or two. Next shot: Move ZXU from .03 to .01 |
| Dec 9 2003 01:09:07:850PM | 1031209016 | Dmitri Mossessian | Shot 16: Move ZXU from .03 to .01 plasma disrupted at 0.81 sec. xpoint is right on the wall. next shot: Give up on the high triang. point and try for deltau=0.2 |
| Dec 9 2003 01:27:21:760PM | 1031209017 | Dmitri Mossessian | Shot 17: Import seg2 from shot 10 and add .01 to every point from .47sec on Mossessian is back. Plasma. TCI is bad - we lost feedback and got too high nl target - lost J-port. Next shot: Move RXU out 1 cm - trying to get upper delta of 0.2 |
| Dec 9 2003 01:42:57:360PM | 1031209018 | Dmitri Mossessian | Plasma. TCi is OK. Delta upper =0.2 Next shot: load segment 2 from shot 10 |
| Dec 9 2003 01:55:54:240PM | 1031209019 | Dmitri Mossessian | Plasma. Next shot: smaller lower delta - move RXL out 1 cm |
| Dec 9 2003 02:07:55:667PM | 1031209020 | Dmitri Mossessian | Plasma. Lower triangularity 0.5 Next shot: smaller lower delta - move RXL out 1 cm |
| Dec 9 2003 02:20:20:920PM | 1031209021 | Dmitri Mossessian | Plasma. Lower triangularity 0.45 Next shot: repeat |
| Dec 9 2003 02:33:13:707PM | 1031209022 | Dmitri Mossessian | Fizzle. Fields and current rise are exactly the same as on shot 21 Next shot: no change |
| Dec 9 2003 02:47:09:743PM | 1031209023 | Dmitri Mossessian | Plasma. W peaks at 186. Two periods with small ELMs Next shot: load segment 2 from shot 20 |
| Dec 9 2003 03:01:27:017PM | 1031209024 | Dmitri Mossessian | Plasma. Good EDA with ELMs Next shot: repeat |
| Dec 9 2003 03:10:09:097PM | 1031209025 | Dmitri Mossessian | Plasma. RF trips more, otherwise similar to 24 Next shot: repeat |
| Dec 9 2003 03:34:56:497PM | 1031209027 | Dmitri Mossessian | Fizzle. As unexplicable as the previous one. Next shot: no changes |
| Dec 9 2003 03:49:15:050PM | 1031209028 | Dmitri Mossessian | Plasma Next shot: load segment 2 from shot 23 |
| Dec 9 2003 04:01:46:180PM | 1031209029 | Dmitri Mossessian | Fizzle. Bz is slightly lower than before. Next shot: IC_EF4U -1335 -> -1325 |
| Dec 9 2003 04:14:57:763PM | 1031209030 | Dmitri Mossessian | Plasma. RF trips a lot Next shot: Bz is back where it was. Repeat. |
| Dec 9 2003 04:29:09:893PM | 1031209031 | Dmitri Mossessian | No power shot - computer problems at INIT |
| Dec 9 2003 04:40:13:413PM | 1031209032 | Dmitri Mossessian | Plasma, H-modes with small ELMs Next shot - repeat. |
| Dec 9 2003 04:52:58:903PM | 1031209033 | Dmitri Mossessian | Plasma, Next shot - repeat. |
| Dec 9 2003 05:01:31:670PM | 1031209034 | Dmitri Mossessian | Fizzle. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:56:28:040AM | Plasma | Ok | |
| 2 | 09:42:57:210AM | Plasma | Ok | |
| 3 | 09:56:53:373AM | Plasma | Ok | |
| 4 | 10:09:22:307AM | Plasma | Ok | |
| 5 | 10:21:57:177AM | Plasma | Bad | OH2 State Flt |
| 6 | 10:46:09:917AM | Plasma | Ok | |
| 7 | 10:59:45:240AM | Plasma | Ok | |
| 8 | 11:17:06:343AM | Plasma | Ok | |
| 9 | 11:29:58:840AM | Plasma | Ok | |
| 10 | 11:43:57:723AM | Plasma | Ok | |
| 11 | 11:58:06:483AM | Plasma | Ok | |
| 12 | 12:10:55:510PM | Plasma | Ok | |
| 13 | 12:24:44:130PM | Plasma | Ok | |
| 14 | 12:37:17:803PM | Plasma | Ok | |
| 15 | 12:51:05:513PM | Plasma | Ok | |
| 16 | 01:04:05:347PM | Plasma | Ok | |
| 17 | 01:19:11:947PM | Plasma | Ok | |
| 18 | 01:35:36:750PM | Plasma | Ok | |
| 19 | 01:48:17:300PM | Plasma | Ok | |
| 20 | 02:00:55:180PM | Plasma | Ok | |
| 21 | 02:13:51:840PM | Plasma | Ok | |
| 22 | 02:26:16:770PM | Plasma | Ok | |
| 23 | 02:39:20:350PM | Plasma | Ok | |
| 24 | 02:51:55:030PM | Plasma | Ok | |
| 25 | 03:04:45:940PM | Plasma | Ok | |
| 26 | 03:17:16:320PM | Plasma | Ok | |
| 27 | 03:30:46:573PM | Plasma | Ok | |
| 28 | 03:43:50:237PM | Plasma | Ok | |
| 29 | 03:56:20:723PM | Plasma | Ok | |
| 30 | 04:09:06:900PM | Plasma | Ok | |
| 32 | 04:32:33:113PM | Plasma | Ok | |
| 33 | 04:45:15:633PM | Plasma | Ok | |
| 34 | 04:57:47:687PM | Plasma | Ok | |