| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Steve Golovato |
| Physics operator(s): | Ian Hutchinson |
| Engineering operator(s): | Joe Daigle,Vinny Bertolino |
| Engineering Operator Run Comment |
| icrf, h-mode |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:14:930PM |
| Author: To Be Determined |
Run summary - 960116 SL: Golovato PO: Hutchinson EO: Bertolino/Daigle Run 951205 - H-modes with bornized walls. Goals - (1) get position feedback working. (2) explore H-mode quality at high rf power P > 2 MW. (3) density scan, particularly down in density. (4) PEP-mode plus high power rf using lithium pellets. This run was very successful, achieving record stored energy (213 kJ), record energy confinement (80ms), and record H-factor (2.2), with shot 25 the best example. The factor relative to ITER94 elm-free global energy confinement scaling was as high as 1.5 . We got the position feedback going early on fiducial shots, with a hybrid gain of -2000 and target loading bira level of 3 volts,giving the best results. We moved on to H-mode studies, scanning the density down and getting the best H-modes we've seen. The H-modes exhibited strange H-alpha behavior (first observed last friday) with H-alpha at first dropping as in normal H-mode and then rising up again to near the L-mode level while other H-mode indicators such as loading, edge profiles, and improved confinement continuing. However, when this H-alpha effect does not occur, the confinement is best, as evidenced on shots 18, 24, 25, and 27 (shot 18 was at 800 kA, the others at 1 MA). We found a low density limit for getting H-mode of nl04 > 0.5e20. The best results were with initial nl04 = 0.7-0.9e20, with nl04 rising to about 1.5e20 during H-mode. We also got good quality H-modes at initial density of nl04=1.2e20 (see shot 27). In the lower density high quality H-modes, the radiated power fraction increased indicating impurity buildup, but record values of stroed energy and confinement time were nevertheless achieved. We had D-port coupling problems at high density (31 and 32). We tried gas puffing after RF turn-on (33) but D-port didn't stay on, and we didn't even get H-mode. Li pellet injection was tried on shots 34-39 (except 37 which was a fiducial). Initially we had coupling problems (E-port was way off tune), but 38 and 39 had acceptable RF. No good looking PEP mode, but we did observe H-modes. For information on engineering problems and shot statistics, see the physics operator summary. For shot-to-shot comments, see the logbook under the session_leader topic. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:55:770PM |
| Author: To Be Determined |
| Physop 960116 MP 132 ICRF H-mode Confinement with Boronized walls. SL Golovato PO Hutch EO Bertolino NO ECDC this weekend (3 days) since the Friday run with boronized walls. Summary _______ Excellent plasmas! Got several records. Over 200kJ stored energy. H-factor over 2. This seems to show that if the impurity buildup during (especially) ELM-free H-modes is controlled, then very good confinement is possible. Boronization appears to be capable of this control, at least for a while. Also demonstrated again the hard low-density limit of H-modes but with 2.5MW this time. Fiducial shots: Several early but without Mo monitor; also 26, 37. 0.8MA till shot 21 then 1MA except for fiducials. Density scans were obtained at both currents. These show best H-modes at the lowest density for wich they occur (and are not swamped by radiation). The reason for confinement deterioration at higher density appears to be the effect of Halpha rise, as if ELMS but incoherent, accompanying particle confinement degradation. This helps keep the plasma clean. There were signs by the end that the Mo radiation was starting to come back after several serious disruptions. However still much improved relative to pre-boronization. Fizzle problem was controllable by a combination of field tweaks and p0 adjustments. The boronized machine is less forgiving. If running high density, the fill puff should be lowered to about 11ms (1.2e-5). The magnetics startup was not changed after shot 28. Good current rampdowns were obtained by using the RCUR offset switch at 1.1s. Scorecard. _________ Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax 1 0.000 0.013 2 1.531 0.825 3 1.524 0.825 4 0.000 0.018 5 1.518 0.825 6 0.000 0.021 7 1.521 0.828 8 1.507 0.838 9 0.000 0.021 10 1.524 0.838 11 1.526 0.843 12 1.526 0.838 13 1.536 0.848 14 0.000 0.042 15 1.537 0.848 16 1.532 0.843 17 1.538 0.848 18 1.537 0.846 19 1.533 0.840 20 1.528 0.833 21 1.535 1.039 22 1.095 1.045 23 0.000 0.024 24 1.538 1.042 25 1.535 1.042 26 1.524 0.825 27 1.520 1.029 28 0.000 0.024 29 1.456 1.029 30 0.000 0.024 31 1.399 1.021 32 1.298 1.019 33 1.234 1.008 34 1.084 1.011 35 0.595 0.988 36 1.064 1.034 37 1.518 0.825 38 1.502 1.027 39 1.507 1.029 Finished summary for 960116 Total of 39 shots. 39 shots. 31 plasmas. 7 fizzles. 1 duds. Fizzle = gt 17 lt 50kA. Details _______ Load 960112037, a fiducial shot. But there is a lot of field gradient at startup. Gas PG4 B-top 5.1 PG3 A-side 20.psi D2 1 OHtest No Mo monitor of McP because opressures are too high. 2 Pla To 1.56s. 0.8MW ICRF. H-modes drop at RF trip. Some small injections. Initial CII .01 (vs .003 on 12th) Slow current rise. Good fiducial but no McP or Mo Mon. Repeat. 3 Pla Early CII drops to .004. Cleaner H-mode. nl04 1.1 Add new R-controller at 1.2s with offset 4000 (from 8000) 4 Fiz Oh1 -15781 OH2l -21321, OH2u -22392. Seem to have slightly excessive curvature at bdown. OH1 is not reaching full regulation. OH1V to -50V from -42 in segment 1. 5 Pla OH1 -15880. Got 2MW RF but tripped. PRAD to 1.2MW. ICEF4 to -1180 (from -1150) Add RF feedback to the RCUR controller in segment 2 at -2000. 6 Fiz Vacuum fields quite good. Br slightly high. Oh1 -15826 Repeat 7 Pla 2.25MW sustained. H alpha saturates even though we seem to be in H-mode PRAD only 0.6MW. 111kJ. RF feedback to -2500, RCUR offset to 2000 at 1.1s. 8 Pla RF on earlier, .65s, Apparent pi injection at .73s. PRAD to 2.5MW! But then pumps. out. Argon puff .28 to .30s, 2psi. RF feedback back to -2000. nl04 to 0.9 from 1. 9 Fiz Add RCUR glitch at end to compensate the offset switch at 1.1s. Br offset to 6.4 from 6.9mT 10 Pla 2.8MW sustained. No injection. 140kJ. Te peak at nearly 4keV. Prad=.8MW. Hfactor very high ~1.7. nl04 to .8. Open Mo Monitor. 11 Pla 3MW sustained. Radiative injection at .95s. 155kJ. Right gap is pulled down to .7cm. OH1V to 200V .005-.010s. RF feedback target altered. Mo monitor High voltage increased. 12 Pla 3MW, radiation rising but no obvious injection. 153kJ Not much position change. Very similar to previous shot. No Mo lines on hirex spectrum. (Or Mo mon). nl04 to .7 Mo Mon Hi voltage increased again. 13 Pla RF trips. Mo monitor now has a sensible-looking signal. 1e15. McPherson gate vale opened. 14 Fiz Crashed on the outside at 17ms, 40kA. OH1V to 170V, 5-10ms. 15 Pla Slight initial bump on outside. Rf Tripped to 1MW, but H-mode sustained. Mo 2e15. RCUR feedback on at 6ms (from 8ms). 16 Pla 2.6MW sustained. 140MJ Mo 1.2e15. nl04 to .6 17 Pla 2.6Mw trips to 1MW. Strong Mo radiation rise to 5e15. 156MJ. Repeat 18 Pla Rf sustained 2.4MW. Substantial Radiation, but rolls over as the Halpha secondary rise occurs. 164kJ but also rolls over. H-factor over 2. Prad is lower than 2pi. (?Argon) 19 Pla 2.5MW sustained. Radiation controlled. 100kJ of energy. Density about 1.e20. nl04 to .45 20 Pla L-mode. 2.5MW sustained. .65 nl04. PRAD.4MW. PSOL 3MW. Mo 1e15. nl04 to .6. Load Ip from 951206028, 1MA shot. 21 Pla ELM-free H-mode. RF trips to 1.3 MW in .8s. Mo integrates to 8e15. 185 kJ. Repeat 22 Pla Mostly L-mode. Disruption at .8MA in ramp down. Seems to be caused by a radiative event at 1.08, disrupting at 1.09s. Raise nl04 to .8 23 Fiz Close. CII .006. 24 Pla Ramped down. 2.3MW sustained. ELM-free throughout. Big radiation. 210 kJ. Mo 8e15. H-factor reaches 2.5 but radiation rolls it over. nl04 to .7. 25 Pla Very similar shot. Mo rises slightly slower. Load segment 2 from shot 3. Fiducial. 26 Pla Fine Fiducial. Mo still rising at the end to 1.4e15.. Reload seg 2 from 25. Disable Ar. nl04=1. 27 Pla 2.7MW sustained. H-mode nl04 to 2.3. Secondary Halpah rise. Mo 2e15. 202kJ. Enable Ar. nl04 to 1.2. 28 Fiz CII .004, 27kA. OH1V to 200 @5ms (only). 29 Pla 2.9MW 186kJ. Strong secondary Halpa rise. Mo 2e15. H-factor still nearly 2. nl04 to 1.5, add gas puff on PG4 100 from .2to .25s. Reduce fill puff to 17ms from 19. 30 Fiz p0 barely reduced. About 1.7e-5 ratiomatic. Fill puff to 15ms. 31 Pla RF tripped to 1.2MW. H-mode dithers/ELMS. Got p0=1.36e-5. Startup looks good. Mo 1.5e15. PRAD 1.2MW. Decrease nl04 ramp rate. 32 Pla RF trips to 1.2MW. PRAD 1.2MW, Mo 1.5e15. Progam nl04 with H-mode shape to 2.3e20, to keep gas on. 33 Pla RF trips again to 1.0MW. H-mode not obtained. Mo injection at .2s. Disrupts during ramp-down at 450kA. Wolfe says we won't get a plasma. Lower fill-puff to 12ms. Set nl04 to 1.e20. Call for pellets at .5 and .8s. 34 Pla Wolfe was wrong. But disrupted in ramp down at .9MA. Got the pellets. RF only at the 1.4MW level.No PEP. p0=1.2e-5. 35 Pla Disrupts at 1MA .55s Looks as if the pellet did it. It was huge. Plasma went vertically, it appears to be yanked by the RF feedback. Remove RF RCUR feedback. Fill puff to 11ms. 36 Pla Got 2 RF pulses but only the first pellet. Disruption at 1.08s, Halo warning. No H-mode, no obvious reason. Mo now 3e15 during RF with not H-mode. Import seg 2 from shot 26. Fiducial 37 Pla Fine fiducial. Mo =1.5e15 in H-Mode. Reload 36. 38 Pla Ramps down. Mo injection at .63s. First pellet gives H-Mode. 39 Pla Repeat. Fine. |
| Session Leader Comments | |||
| Jan 16 1996 09:25:14:310AM | Steve Golovato | run 960116 -
goal: to further investigate and optimize h-modes with boronized walls. (1) get position feedback working, (2) raise power using both transmitters. (3) density scan to find best conditions, particualrly at lower density where we are well above threshold and where the boronization will have the most effect on moly levels in the core. (4) pep-mode with lithium pellets. | |
| Jan 16 1996 09:26:34:800AM | Steve Golovato | run 960116 - no ecdc since last run to see how boronized walls behave.
| |
| Jan 16 1996 09:15:10:300AM | 960116001 | Steve Golovato | shot 960116001 - power supply test
|
| Jan 16 1996 09:16:53:290AM | 960116002 | Steve Golovato | shot 960116002 - fiducial shot.
plasma, h-mode, no e-port rf. no moly monitor yet, pump shut down at power glitch friday night and is still pumping down. |
| Jan 16 1996 09:19:02:530AM | 960116003 | Steve Golovato | shot 960116003 - fiducial shot.
plasma, h-mode, no e-port rf, pppl arc detector in cell gving continuous arc indication, will be disabled ,at transmitter. this is a redundant arc indication, there is an additional reflected power arc detector at the transmitter. |
| Jan 16 1996 09:20:03:920AM | 960116004 | Steve Golovato | shot 960116004 - fiducial shot. raised d-port power, increased overlap
of d and e, to .8-1. sec. fizzle. |
| Jan 16 1996 09:47:21:600AM | 960116005 | Steve Golovato | shot 960116005 - plasma, h-mode. d-port tripped early.
h-mode quality not so high so far. |
| Jan 16 1996 09:49:03:930AM | 960116006 | Steve Golovato | shot 960116006 - rasied e-port power. position feedback enabled with
gain of -2000 (max safe gain is -2750). will feedback for about 8 ohms loading (-2.8 volts on bira). |
| Jan 16 1996 10:01:17:370AM | 960116006 | Steve Golovato | shot 960116006 - fizzle.
|
| Jan 16 1996 10:03:47:220AM | 960116007 | Steve Golovato | shot 960116007 - plasma, h-mode, 2.3MW. getting strange h-mode with
h-alpha recovering to high level during h-mode. positin feedback working. |
| Jan 16 1996 10:17:32:690AM | 960116008 | Steve Golovato | shot 960116008 - raising power, increasing fb gain to -2500.
plasma. 2.6MW. h-mode. event at .733 sec, impurity injection? |
| Jan 16 1996 10:21:40:470AM | 960116008 | Steve Golovato | shot 960116008 - raising power, increasing fb gain to -2500.
plasma. 2.6MW. h-mode. event at .733 sec, impurity injection? |
| Jan 16 1996 10:27:31:320AM | 960116009 | Steve Golovato | shot 960116009 - reduce fb gain to -2000, plasma may have been pulled
to close last shot causing impurity event, cause and effect difficult to determine. lower nl04 to 0.9e20. fizzle. |
| Jan 16 1996 10:49:58:570AM | 960116010 | Steve Golovato | shot 960116010 - plasma, h-mode, 2.8MW. nl04=1.e20 just before rf,
was 1.1e20 for previous shots. wp_efit = 140 kj, record for 800ka. |
| Jan 16 1996 10:50:34:540AM | 960116010 | Steve Golovato | shot 960116010 - plasma, h-mode, 2.8MW. nl04=1.e20 just before rf,
was 1.1e20 for previous shots. wp_efit = 140 kj, record for 800ka. h-factor=1.7 steady-state. |
| Jan 16 1996 11:10:48:260AM | 960116011 | Steve Golovato | shot 960116011 - lower nl04 to 0.8e20.
plasma, initial nl04=0.9e20, 3MW. 155kj., had impurity event at .911sec, plasma may be too close to antenna at the lower nl. |
| Jan 16 1996 11:25:29:850AM | 960116012 | Steve Golovato | shot 960116012 - lowered target loading for feedback (changed bira from
2.8 to 2.9), hopefully to not pull the plasma too close to the antennas. plasma, h-mode, 3MW, nl04 durig h-mode =1.7e20., Te_gpc=3.3kev, Te_ts=4kev, 155 kj, h-factor=1.6. stored energy rising contiuously during h-mode. |
| Jan 16 1996 11:39:19:720AM | 960116013 | Steve Golovato | shot 960116013 - lower initial nl04 to 0.7e20, lower target loading
again. plasma, h-mode, e-port overloaded at .723sec. moly monitor back on, level similar to last run but rf power much higher. |
| Jan 16 1996 11:42:24:110AM | 960116014 | Steve Golovato | shot 960116014 - fizzle.
|
| Jan 16 1996 11:57:54:690AM | 960116015 | Steve Golovato | shot 960116015 - tuned e-port, adjusted inital e-port power to
avoid overload during short l-mode at beginning. plasma, h-mode, Te_ts=4.6kec just before e-port crowbarred. |
| Jan 16 1996 12:12:34:010PM | 960116016 | Steve Golovato | shot 960116016 - lower e-port power, try again.
plasma, h-mode, 2.7MW, 140kj, h-factor=1.7 |
| Jan 16 1996 12:26:51:010PM | 960116017 | Steve Golovato | shot 960116017 - lower initial nl04 to .6e20
plasma, h-mode, e-port crowbarred at 0.8sec. moly up to 5, was 1-2. 2.6MW, 160kj. |
| Jan 16 1996 12:35:37:030PM | 960116018 | Steve Golovato | shot 960116018 - lowered e-port power.
plasma, h-mode, 2.5MW, 164kj just before h-alpha blob starts, Te_gpc=4kev, Te_ts=4.5kev, h-factor>2 just before blob. |
| Jan 16 1996 12:50:23:900PM | 960116019 | Steve Golovato | shot 960116018 - lowered initial nk04 to .5e20.
plasma, h-mode, but small density rise, Te_gpc=3kev, 2.5MW, 104kj. h-mode quality down. |
| Jan 16 1996 12:58:38:710PM | 960116020 | Steve Golovato | shot 960116020 - lowered initial nk04 to .45e20.
plasma, no h-mode. 2.7MW. this is apparently the low density limit for h_mode, about nl04=.5-.6e20. |
| Jan 16 1996 01:17:34:780PM | 960116021 | Steve Golovato | shot 960116021 - going back to best shot, 960116018, and raising
Ip to 1 MA. plasma, h-mode, 185kj, 2.4mw, d-port tripped. |
| Jan 16 1996 01:26:50:390PM | 960116022 | Steve Golovato | shot 960116022 - tuned d-port a little, try again.
plasma, lose h-mode early, may need more initial density at this Ip. disrupted during rampdown 850ka. |
| Jan 16 1996 01:34:32:570PM | 960116023 | Steve Golovato | shot 960116023 - raise density to .8e20 to recover from disruption.
fizzle. |
| Jan 16 1996 01:54:35:240PM | 960116024 | Steve Golovato | shot 960116024 - try again.
plasma, h-mode. 2.4 MW, continuous nl rise during rf. Te_gpc=4.5kev, Te_ts at sawtooth peak=6.5kev. no h-alpha blob during h-mode. moly level high. wp_efit=211kj. neutron rate 9.5e13. h-factor > 2. |
| Jan 16 1996 02:12:11:200PM | 960116025 | Steve Golovato | shot 960116025 - lower initial nl lowered to .7e20.
plasma. much like last shot, moly lower, not saturated. 2.4MW, 213KJ, neutrons 1.06E14. h-factor=2.2. best shot!!!! |
| Jan 16 1996 02:34:03:660PM | 960116026 | Steve Golovato | shot 960116026 - fiducial.
|
| Jan 16 1996 02:41:39:530PM | 960116027 | Steve Golovato | shot 960116027 - back to 1 MA
nel_04 = 1.2 (before RF) 200 kJ, H = 2 (nice steady state) |
| Jan 16 1996 02:45:35:640PM | 960116028 | Steve Golovato | shot 960116028 - fizzle
|
| Jan 16 1996 03:05:35:560PM | 960116029 | Steve Golovato | shot 960116029 - Stored energy of 186 kJ with a nice steady
state. H-factor of 1.70 (approx). |
| Jan 16 1996 03:09:03:650PM | 960116029 | Steve Golovato | shot 960116029 - Addendum to previous entry. The density
was nel_04=1.25 for this shot. |
| Jan 16 1996 03:09:46:540PM | 960116030 | Steve Golovato | shot 960116030 - Shot was a fizzle
|
| Jan 16 1996 03:28:43:780PM | 960116031 | Steve Golovato | shot 960116031 - Achieved nl_04=1.40, but D-port power shut down.
H-factor was 1.4, a "positve" function of the rf power. |
| Jan 16 1996 03:41:40:880PM | 960116032 | Steve Golovato | shot 960116032 - Achieved nl_04=1.38, but D-port shut dowm again.
Got W_efit=128 kJ. |
| Jan 16 1996 03:49:59:440PM | 960116033 | Steve Golovato | shot 960116033 - Tried to gas puff immediately after rf injection.
Experienced D-port shut down again. Decided to go to PEP mode. |
| Jan 16 1996 04:15:11:840PM | 960116034 | Steve Golovato | shot 960116034 - Two Li-pellets injected. RF power in D- port OK (had
only one trip), but E-port had problems staying on.. |
| Jan 16 1996 04:22:46:300PM | 960116035 | Steve Golovato | shot 960116035 - Two Li-pellets again. We retuned D- and E-ports
after shot #34. Got a disruption caused by rf - feedback. Feedback was not set up right and will be turned off for the next shot. |
| Jan 16 1996 04:39:32:190PM | 960116036 | Steve Golovato | shot 960116036 - One Li- pellet at 0.5 sec. D-port had a trip
but recovered and E-port coupled well. No H-mode with about 2.6-2.7 MW of ICRf power. |
| Jan 16 1996 04:53:54:270PM | 960116037 | Steve Golovato | shot 960116037 - A Fiducial Shot. D- and E- ports coupled power
properly - feedback control was still shut off. Got H-mode with about 83 kJ of stored energy. |
| Jan 16 1996 05:02:54:230PM | 960116038 | Steve Golovato | shot 960116038 - One pellet injected. Got H-mode with 138 kJ of
stored energy. D- and E-port power coupled properly. |
| Jan 16 1996 05:14:00:150PM | 960116039 | Steve Golovato | shot 960116039 - Injected one Li-pellet. Got H-mode with 148 kJ
of stored energy. RF power coupled Ok through D- and E- port. |
| Physics Operator Comments |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:34:31:100AM | Test | Ok | |
| 2 | 08:52:05:480AM | Plasma | Ok | |
| 3 | 09:04:38:840AM | Plasma | Ok | |
| 4 | 09:15:07:320AM | Plasma | Ok | |
| 5 | 09:28:06:010AM | Plasma | Ok | |
| 6 | 09:44:41:760AM | Plasma | Ok | |
| 7 | 09:53:36:650AM | Plasma | Ok | |
| 8 | 10:11:00:370AM | Plasma | Ok | |
| 9 | 10:25:48:980AM | Plasma | Ok | |
| 10 | 10:38:51:860AM | Plasma | Ok | |
| 11 | 11:00:14:780AM | Plasma | Ok | |
| 12 | 11:13:31:420AM | Plasma | Ok | |
| 13 | 11:28:24:190AM | Plasma | Ok | |
| 14 | 11:40:45:770AM | Plasma | Ok | |
| 15 | 11:49:42:040AM | Plasma | Ok | |
| 16 | 12:01:09:160PM | Plasma | Ok | |
| 17 | 12:14:56:660PM | Plasma | Ok | |
| 18 | 12:24:54:160PM | Plasma | Ok | |
| 19 | 12:39:53:220PM | Plasma | Ok | |
| 20 | 12:51:52:250PM | Plasma | Ok | |
| 21 | 01:03:52:680PM | Plasma | Ok | |
| 22 | 01:17:49:160PM | Plasma | Ok | |
| 23 | 01:32:55:810PM | Plasma | Ok | |
| 24 | 01:44:14:760PM | Plasma | Ok | |
| 25 | 01:59:08:650PM | Plasma | Ok | |
| 26 | 02:12:23:560PM | Plasma | Ok | |
| 27 | 02:23:25:900PM | Plasma | Ok | |
| 28 | 02:41:50:110PM | Plasma | Ok | |
| 29 | 02:50:30:690PM | Plasma | Ok | |
| 30 | 03:05:25:090PM | Plasma | Ok | |
| 31 | 03:14:51:250PM | Plasma | Ok | |
| 32 | 03:28:11:640PM | Plasma | Ok | |
| 33 | 03:39:48:860PM | Plasma | Ok | |
| 34 | 03:58:24:360PM | Plasma | Ok | |
| 35 | 04:11:36:490PM | Plasma | Ok | |
| 36 | 04:27:14:960PM | Plasma | Ok | |
| 37 | 04:39:35:460PM | Plasma | Ok | |
| 38 | 04:53:02:010PM | Plasma | Ok | |
| 39 | 05:01:37:190PM | Plasma | Ok | |