| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Bruce Lipschultz |
| Physics operator(s): | Ron Parker,Steve Wolfe,Ron Parker |
| Engineering operator(s): | Bill Cochran,Gary Dekow,Ed Fitzgerald |
| Engineering Operator Run Comment |
| MP#417 |
| Session Leader Plans |
| Entered: Apr 21 2005 08:54:25:167AM |
| Author: Bruce Lipschultz |
| Continuation of post-boronization MP #417 - Plasma performance, boronization and
ICRF heat effectiveness with high-Z antenna guards and all-metal surfaces. SL - B. Lipschultz (standin for Y. Lin) 1) Start off with a fiducial shot. This should include the gate valvews closed. The equilibrium should be loaded from 1050420025. The RF power should ramped to 2MW starting at 0.75 seconds. This gives us an Ohmic phase, some information on the H-mode threshold. The ramp in RF power should be followed by a step up to 3 MW. It would probably be useful to have a dropout in the ICRF for heating efficiency as well. Following the fiducial at least one shot is needed at 3 MW to compare to 1050420 shots. 2) Proceed with the current scan: After optimizing the RF and gaps at 3MW and 1 MA, go back to 1.2 MA (1050420032) and the same density (nl04=1) and 2 MW RF for the RF to tune up.Then increase the power to 3 MW. Once the power is increased go through the density scan. 3) H-mode threshold: If the 1 MA shots are not worth pursuing for stored energy levels, then do the H-mode threshold at this current at various densities. This would be followed by the same threshold study at 1 MA. 4) Repeat fiducial shot at end of day. |
| Physics Operators Plans |
| Entered: Apr 20 2005 04:56:10:720PM |
| Author: Ron Parker |
| MP#417 post-boronization evaluation of all-metal ... SL: Lipschultz PO: Parker Engineering setup as on shot 1050420032 ECDC overnight in D2, bake at 60 C. Run begins at 09:00 ends at 17:00 EDT Power systems as on 1050420032 A-coil in standard configuration and enabled (+Dtop -Dbot -Jtop +Jbot) Transmitters 1,2,3,4 in RUN-ON by 08:30 Gas setup: fill B-top with 6 psi D2 hybrid enabled (PG4) fill B-side lower as it was at the end of the run 1050405 disabled (PG1) leave B-side upper with He3 Hybrid disabled (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) NINJA puff setup (fill to 10 PSI D2, but disable) Enable the following gate valves: ECE, VUV, Z-bolo shutter Run Plan: This will be a continuation of MP417, detailed run plan TBD pending results of 1050420 run. |
| Session Leader Summaries |
| Entered: Apr 21 2005 05:37:30:220PM |
| Author: Bruce Lipschultz |
| Continuation of post-boronization MP #417 - Plasma performance, boronization and
ICRF heat effectiveness with high-Z antenna guards and all-metal surfaces. SL - B. Lipschultz (standin for Y. Lin) PO: R. Parker (and S. Wolfe) The day started out with poorer confinement performace plasmas than yesterday. We scrapped the plan to go to higher current to boost stored energies and concentrated on understanding the level of impurities and the changes in confinement. After some initial problems getting the McPherson going we were able to verify that the Mo levels were higher than yesterday. They appear to be factors of 2 higher. The radiated was also higher. We then concentrated on optimizing the strike point position. We had noticed that the strike point had been wandering up to the outer divertor nose. Some camera pictures hinted that there was some melting there. In any case a bad idea as those tiles are not optimized for heat loads. Since the radiated power and Mo in the core were screaming up at the beginning of the H-mode we wanted to see if we could reduce this and perhaps get something more steady state. This seemed to work - e.g. shot 16, 17 & 19. We noticed that the above shots, with low power on J, seemed better in terms of impurities. For comparison we increased J antenna from 0.4 to 1.2 MW and dropped E to 400 kW. This was not quite as good. But we are not sure whether to blame J for that difference. We dropped the puff (shots 24, 25) during the H-mode and things got worse again. This was true for the E antenna low power (J high) and the opposite. We increased the puff again on shot 27 and the H-mode was more steady state. However, the radiated power was higher than earlier shots (e.g. 17) indicating that the level of Mo had gone steadily up. We repeated the fiducial from earlier in the day (keeping the equilibrium changes). The plasma performance was definitely degraded. The observations through the day seemed to indicate that this was a steady decrease. Other summary comments: H/D was pretty steady at 5% through most the day. Zeff during the RF was 1.5 and higher (for no puff during H-mode). J antenna may lead to more Mo influx than D/E for the same delivered power. However, it is difficult to make the case strongly. Certainly it fared no better than D/E even at lower power per unit area. Puffing during the initial rise of the H-mode, and perhaps at a low level during the H-mode, appeared to keep the radiation from running away. I suppose this could be due to cooling locally around the antenna if that were the source of Mo. It would also help the divertor because we can see the pressure rise there as well. I note that the Chromex measurements never indicated that D/E were the source of Mo during these experiments. That could mean that the D/E source was out of the field of view or that it was elsewhere. |
| Physics Operator Summaries |
| Entered: Apr 21 2005 05:24:43:047PM |
| Author: Ron Parker |
| The machine ran generally well for this run, with only one fizzle
and two disruptions. No tuning of the startup was necessary and breakdown was consistently at ~ 5 ms. There were a few problems with data system hangups that caused short delays, but 30 shots were run. Regarding the disruptions, S. Wolfe moved X-point (see PO log, shots 9-16) and changed the density rise. These changes may have cured the disruption problem that we had in shots 6 & 7. Scorecard: 30 shots, 1 fizzle, 2 early disruptions, 1 data problem, 1 operator error and 25 shots with useful data. |
| Session Leader Comments | |||
| Apr 21 2005 09:48:59:527AM | 1050421001 | Bruce Lipschultz | Attempt at fiducial. VUV spectrometer off because of pump issues. RF had problems. Try again.
H-mode threshold ~ 1.2 MW. 140 kJ & 2.2 MW. H/(H+D) ~ 3.5%. Radiated power kills off each H-mode. |
| Apr 21 2005 09:46:29:713AM | 1050421002 | Bruce Lipschultz | Second attempt at fiducial. VUV spectrometer off because of pump issues. RF had problems.
H-mode threshold ~ 1.55 MW. Try again to get D-port going, raise the density a little to perhaps help with radiation. H/(H+D) ~ 3.5%. Radiated power kills off each H-mode |
| Apr 21 2005 09:46:06:570AM | 1050421003 | Bruce Lipschultz | D a little better but still tripping
H-mode threshold ppaears high - 2 MW. H factor poor. Things have definitely degraded since yesterday. 165 kJ & 3 MW RF. Try again to get D-port settled then on to H/(H+D) ~ 4%. |
| Apr 21 2005 10:09:07:993AM | 1050421004 | Bruce Lipschultz | H-mode threshold a~ 1.66 MW. H factor poor.
W~ 155 kJ & 3 MW RF. H/(H+D) ~ 4%. |
| Apr 21 2005 10:09:18:243AM | 1050421005 | Bruce Lipschultz | fizzle |
| Apr 21 2005 10:27:33:057AM | 1050421006 | Bruce Lipschultz | early disruption of unknown origin |
| Apr 21 2005 11:12:18:040AM | 1050421008 | Bruce Lipschultz | 160 kJ and 3 MW.
Radiated power ~ 2 MW |
| Apr 21 2005 11:13:29:790AM | 1050421009 | Bruce Lipschultz | 150 kJ and 3 MW.
Radiated power ~ 2 MW H/(H+D) creeping up to 6% |
| Apr 21 2005 11:58:19:010AM | 1050421011 | Bruce Lipschultz | 150 kJ and 3 MW.
Radiated power ~ 2 MW, in and out H-mode VUV spectrometer on. Hope to get some data on the radiation. H/(H+D) ~ 5% |
| Apr 21 2005 12:28:16:540PM | 1050421012 | Bruce Lipschultz | 150 kJ and 3 MW.
Radiated power ~ 2 MW, in and out H-mode VUV spectrometer on. Hope to get some data on the radiation. Jim indicates dominance of Mo and increase over yesterday. H/(H+D) ~ 5% |
| Apr 21 2005 12:30:08:350PM | 1050421013 | Bruce Lipschultz | 150 kJ and 3 MW.
Radiated power ~ 2 MW, in and out H-mode VUV spectrometer on. Hope to get some data on the radiation. Jim indicates dominance of Mo and increase over yesterday. Zeff hit 1.7. H/(H+D) ~ 5.5% |
| Apr 21 2005 12:38:47:723PM | 1050421014 | Bruce Lipschultz | Dropped current to 800 kA to see if we get better EDAish plasmas. Not any better.
115 kJ and 3 MW. Radiated power ~ 2 MW, in and out H-mode VUV spectrometer on. Hope to get some data on the radiation. Jim indicates dominance of Mo and increase over yesterday. Zeff hit 1.8. H/(H+D) ~ 5.5% |
| Apr 21 2005 12:58:19:910PM | 1050421015 | Bruce Lipschultz | 800 kA
120 kJ and 3 MW. Radiated power ~ 2 MW, in and out H-mode Zeff hit 1.9. H/(H+D) ~ 5.% |
| Apr 21 2005 01:13:13:410PM | 1050421016 | Bruce Lipschultz | 800 kA
120 kJ and 2 MW we think. J was on and off. Radiated power ~ 1.3 MW, and dropping Zeff hit 1.5. H/(H+D) ~ 4.5% |
| Apr 21 2005 01:24:42:783PM | 1050421017 | Bruce Lipschultz | no power shot cycle - CAMAC problems
|
| Apr 21 2005 01:54:19:487PM | 1050421017 | Bruce Lipschultz | Changed the puff during the H-mode to just in the density rise to reduce the Mo. Seems to have helped. Next shot increase the power primarily with D/E.
PRF ~ 2.5 MW W~ 100kJ J~400 kW Zeff ~ 1.5 H/(H+D) ~ 1.5 |
| Apr 21 2005 01:54:56:753PM | 1050421018 | Bruce Lipschultz | No power shot |
| Apr 21 2005 02:26:25:470PM | 1050421019 | Bruce Lipschultz | Also a pretty steady state plasma once the Mo is coughed out at 0.89 s. We have reduced the gas puff at 0.85 seconds for the next shot so as to not cool the plasma too much.
P_RF ~ 3 MW, W ~ 110 kJ No H/D data. Also held up for CPCI data again. |
| Apr 21 2005 03:04:21:423PM | 1050421020 | Bruce Lipschultz | Similar to 19 - Also a pretty steady state plasma once the Mo is coughed out at 0.89 s. We have reduced the gas puff at 0.85 seconds for the next shot so as to not cool the plasma too much.
P_RF ~ 3 MW, W ~ 117 kJ H/D ~ 4,5 %, Zeff ~ 1.5 |
| Apr 21 2005 03:16:26:033PM | 1050421021 | Bruce Lipschultz | Switched J for E port antenna to see if there is any difference in the effect on the plasma. J tripped out many times. The plasma was ELM-free, meaing rising density, from the very beginning.
P_RF ~ 3 MW, W ~ 117 kJ P_rad going intitially above 1.5 MW and then dropping and rising. H/D ~ 4,5 %, Zeff ~ 1.5 Unfortunately J was too high. Scale back the next shot to level of D on shot 20. |
| Apr 21 2005 03:49:26:580PM | 1050421022 | Bruce Lipschultz | Somewhat steady state with J having more power.
P_RF ~ 3 MW, W ~ below 100 kJ after initial rise. P_rad going intitially to 2 MW and then dropping to 1.6. H/D ~ 5 %, Zeff ~ 1.5 UJ about th right level |
| Apr 21 2005 03:50:40:813PM | 1050421023 | Bruce Lipschultz | 3 small drops out of H-mode
P_RF ~ 3 MW, W ~ below 100 kJ after initial rise. P_rad going intitially to 2 MW and then dropping to 1.6. H/D ~ 5 %, Zeff ~ 1.5 J antenna about the right level |
| Apr 21 2005 03:52:26:753PM | 1050421024 | Bruce Lipschultz | No puffs durng H-mode that time. Things are worse.
P_RF ~ 3 MW, W ~ below 100 kJ after initial rise. P_rad going intitially to 2 MW and then constantly oscillating up to 1.8 MW. H/D ~ 5 %, Zeff ~ 1.5 J antenna about the right level. Next shot switch J back to a low level and bring E back up to higher power. |
| Apr 21 2005 04:26:11:660PM | 1050421025 | Bruce Lipschultz | This case is with D & E antennas dominant. No puffs durng H-mode that time. Things are worse than before.
P_RF ~ 3 MW, W ~ below 100 kJ after initial rise. P_rad going intitially to 2 MW and then constantly oscillating up to 1.8 MW. H/D ~ 5 %, Zeff ~ 1.5 Next shot put the gas on during the initial H-mode |
| Apr 21 2005 04:50:24:097PM | 1050421026 | Bruce Lipschultz | This case is with D & E antennas dominant. Puffs during the H-mode rise. No better - so we have not reproduced the earlier shots (e.g. 17).
P_RF ~ 3 MW, W ~ below 100 kJ after initial rise. P_rad going up to 2 MW. H/D ~ 5 %, Zeff ~ 1.5 Next try for more gas puffing. |
| Apr 21 2005 05:11:30:253PM | 1050421027 | Bruce Lipschultz | This case is with D & E antennas dominant. Higher puffs during the H-mode rise. Pretty steady state.
P_RF ~ 3 MW, W ~ 100 kJ after initial rise. P_rad going up to 2 MW. H/D ~ 5 %, Zeff ~ 1.5 |
| Apr 21 2005 05:11:51:020PM | 1050421028 | Bruce Lipschultz | No power shot |
| Apr 21 2005 05:28:54:440PM | 1050421029 | Bruce Lipschultz | Turned the gas feedback on in the period after the start of the H-mode shooting for higher density than the H-mode gives. Things were pretty steady state.
Radiated power 1.7 MW, stored ednergy dropping. |
| Apr 21 2005 05:36:25:063PM | 1050421030 | Bruce Lipschultz | Fiducial repeat of shot 4.
Much worse in terms of radiation a |
| Physics Operator Comments | |||
| Apr 21 2005 09:08:14:900AM | 1050421001 | Ron Parker | Shot 1050421025 was loaded and ran as programmed.
The shot will be repeated on shot 2. |
| Apr 21 2005 09:27:24:573AM | 1050421002 | Ron Parker | Shot 2 ran as programmed. Interrupted H-modes.
Next shot: n_eL(4) increased from 9.5 to 10.5e13 cm-2 |
| Apr 21 2005 09:46:04:087AM | 1050421003 | Ron Parker | Shot 3 ran as programmed. H-Mode sustained.
Cell axis to turn off NPA electronics. Next: Moved plasma 3 mm further from inside wall. (Clearin -3 mm, Rcur -1.5 mm) |
| Apr 21 2005 10:02:16:213AM | 1050421004 | Ron Parker | Shot 4 ran, intermitent H-mode.
For next shot, density will be increased during H-mode Density programme: 2.7e20 on n_eL(4) from 1.25 to 1.4 s |
| Apr 21 2005 10:09:50:993AM | 1050421005 | Ron Parker | Shot fizzled. Rcur readjusted by +3 mm to restore outer gap to
same value as in shots 1-3. |
| Apr 21 2005 10:25:33:777AM | 1050421006 | Ron Parker | Shot 6 disrupted at ~0.64 s.
Try again. |
| Apr 21 2005 10:31:49:400AM | 1050421007 | Ron Parker | Shot disrupted again, no apparent reason.
Next: reload shot 3 |
| Apr 21 2005 10:47:38:353AM | 1050421008 | Ron Parker | Shot ran, was it due to reloaded shot or coincidence?
Steve Wolfe taking over as PO for next shots, until ~ 12:45. |
| Apr 21 2005 11:07:59:917AM | 1050421009 | Steve Wolfe | Shot#9: Make clearin flat at +.002 rcur out by 2mm after .7sec RXL in to -.01 Probably should have raised the fill too. Plasma full length Still lots of radiation. Had an early marfe that takes a bite out of the current. Next shot: move rxl in earlier, to avoid the nose at .4sec move zxl up to get it off the floor |
| Apr 21 2005 11:23:09:823AM | 1050421010 | Steve Wolfe | Shot#10: move rxl in earlier, to avoid the nose at .4sec move zxl up to get it off the floor (from -.01 to -.005) raise nl04 from 1.05 to 1.15, slow down early rise Turn on argon, 30 ms puff at 0.3sec Plasma full length, but had some problems with tci and other things. Actually, B-side lower was filled with 2.1psi of Krypton! Was based on 1050405? Why? Pump it out and put in 1psi argon. |
| Apr 21 2005 11:57:46:197AM | 1050421011 | Steve Wolfe | Shot#11: Strike was still on the floor on shot 10. Move rxl back out to -.005 before at .5sec, ramp to -.01 at .9 sec Argon in bside lower this time. Plasma full length. Radiation is still high, rises are slower than with Krypton though Wmhd~155kJ in multiple H-modes; Outer strike is just at the bottom of the plate. Prefill pressure still looks very low, but don't mess for now. Next shot: no changes, JT will survey |
| Apr 21 2005 12:06:21:010PM | 1050421012 | Steve Wolfe | Shot#12: No pcs changes Plasma full length. JT is scanning VUV Next shot: drop nl04 to 0.8e20 |
| Apr 21 2005 12:15:07:277PM | 1050421013 | Steve Wolfe | Shot#13: drop nl04 to 0.8e20; Argon off. Plasma full length, flickering h-modes First hmode 147kJ, later ones worse. Radiated power PradMain~2MW at each collapse Next shot: Drop Ip to 800kA |
| Apr 21 2005 12:31:18:737PM | 1050421014 | Steve Wolfe | Shot#14: Drop Ip to 800kA, try again to get strike on the tile. Move rxl out to -.006 from -.01 at 0.9sec, let it ramp on in to -.01 Plasma full length. Strike is still on the floor! Wmhd is down to 110kJ. Next shot: add puff in H-mode, move rxl over some more |
| Apr 21 2005 12:44:17:830PM | 1050421015 | Steve Wolfe | Shot#15: add puff in H-mode (nl04 to 2.4e20 betwen 1.2 and 1.4sec), move rxl over some more to -.003 to -.007 plasma full length. Seems to have more density during the puff, didn't get to 2.4e20 next shot: program nl04 1.5@.85 to 2@1.4 |
| Apr 21 2005 12:55:19:160PM | 1050421016 | Steve Wolfe | Shot#16: program nl04 1.5e20@.85 to 2e20@1.4 Raise zxl by 1cm, still trying to get the early strike off the floor. |
| Apr 21 2005 01:44:39:080PM | 1050421017 | Ron Parker | Shot 17a was a no-power shot, due to data system hangup.
The density pulse was modified for this shot to ramp from 1.5e20 to 1.7e20 over the time period .85 to 1.0 s. Since the shot didn't go, We'll shoot it again on shot 18. |
| Apr 21 2005 01:45:20:033PM | 1050421017 | Ron Parker | Shot 17 ran well. |
| Apr 21 2005 01:53:52:673PM | 1050421018 | Ron Parker | Shot 18a was a no-power shot. |
| Apr 21 2005 02:17:42:550PM | 1050421019 | Ron Parker | Shot 19 ran well.
Next shot: density puff lowered to 1.35e20 at t=0.85 s, 1.7e20 @ t=1.0 s. |
| Apr 21 2005 02:39:32:110PM | 1050421019 | Ron Parker | Break in the action while data system problems get fixed. |
| Apr 21 2005 03:19:01:160PM | 1050421020 | Ron Parker | Shot 20 ran well. No machine change for next shot. |
| Apr 21 2005 03:19:21:610PM | 1050421021 | Ron Parker | Shot 21 ran well. No Change in machine parameters for next shot. |
| Apr 21 2005 03:30:49:487PM | 1050421022 | Ron Parker | Shaot 22 ran well. Next: gas puff into H-mode. |
| Apr 21 2005 03:33:33:300PM | 1050421023 | Ron Parker | Shot 23 ran well. |
| Apr 21 2005 03:41:08:313PM | 1050421023 | Ron Parker | Shot 23 ran well. Programmed pulse of gas injected during H-mode.
Next: repeat, but with no gas injected into H-mode. |
| Apr 21 2005 03:47:42:393PM | 1050421024 | Ron Parker | Shot ran well. Intermittent H-mode. |
| Apr 21 2005 04:03:04:847PM | 1050421025 | Ron Parker | Shot ran well. Intermittent H-mode.
Next: return to shot 23 with gas puff into H-mode. |
| Apr 21 2005 04:22:13:643PM | 1050421026 | Ron Parker | Shot ran well, as programmed.
Next shot: Reprogrammed gas puff into H-mode. |
| Apr 21 2005 04:34:12:097PM | 1050421027 | Ron Parker | Shot 27 ran well, with fairly steady H-mode.
next:Back to feedback of density, specifically shot 17 |
| Apr 21 2005 04:42:55:660PM | 1050421028 | Ron Parker | Shot was a no power shot- operator error. |
| Apr 21 2005 04:59:09:847PM | 1050421029 | Ron Parker | Shot 29 ran well.
Next (and last shot): Reload shot 004 as fidicial |
| Apr 21 2005 05:04:25:073PM | 1050421030 | Ron Parker | Shot 30 ran well. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:02:30:993AM | Plasma | Ok | |
| 2 | 09:15:54:760AM | Plasma | Ok | |
| 3 | 09:28:44:260AM | Plasma | Ok | |
| 4 | 09:48:10:557AM | Plasma | Ok | |
| 5 | 10:02:28:433AM | Plasma | Ok | |
| 6 | 10:15:00:120AM | Plasma | Ok | |
| 7 | 10:27:36:823AM | Plasma | Ok | |
| 8 | 10:40:37:980AM | Plasma | Ok | |
| 9 | 11:00:30:337AM | Plasma | Ok | |
| 10 | 11:16:51:730AM | Plasma | Ok | |
| 11 | 11:43:26:337AM | Plasma | Ok | |
| 12 | 11:58:15:010AM | Plasma | Ok | |
| 13 | 12:10:54:837PM | Plasma | Ok | |
| 14 | 12:23:27:713PM | Plasma | Ok | |
| 15 | 12:36:47:650PM | Plasma | Ok | |
| 16 | 12:54:51:970PM | Plasma | Ok | |
| 17 | 01:16:16:957PM | Plasma | Ok | |
| 18 | 01:51:15:673PM | Plasma | Bad | Datasystem problem |
| 19 | 02:06:02:050PM | Plasma | Ok | |
| 20 | 02:49:43:707PM | Plasma | Ok | |
| 21 | 03:03:26:817PM | Plasma | Ok | |
| 22 | 03:16:25:550PM | Plasma | Ok | |
| 23 | 03:29:44:520PM | Plasma | Ok | |
| 24 | 03:42:14:970PM | Plasma | Ok | |
| 25 | 03:55:55:253PM | Plasma | Ok | |
| 26 | 04:14:27:643PM | Plasma | Ok | |
| 27 | 04:27:21:750PM | Plasma | Ok | |
| 28 | 04:39:46:987PM | Test | Ok | This was a no power shot |
| 29 | 04:50:02:267PM | Plasma | Ok | |
| 30 | 05:02:24:783PM | Plasma | Ok | |