| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Amanda Hubbard |
| Physics operator(s): | Ian Hutchinson |
| Engineering operator(s): | Ed Fitzgerald,Bill Parkin,Gary Dekow |
| Engineering Operator Run Comment |
| MP#327 Low ne EDA targets; PO Hutch; SL Hubbard; EO Dekow/Fitz/Parkin |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:32:820PM |
| Author: To Be Determined |
| Run Summary for 1030530: MP#327 Low ne EDA targets Phys. Op: Ian Hutchinson Session Leader: Amanda Hubbard RF Ops: Yijun Lin, Steve Wukitch Physics run plan: The primary goal of this run is to complete Part B as specified in MP#327: Increasing power, and temperature, in low density EDA H-modes so as to demonstrate an attractive LHCD target. The run follows on the previous successful run day on 1021106, which essentially completed Part A: demonstrating a lower density, steady EDA H-mode at 600 kA. On that day we were limited to 2 MW at 80 MHz. Plan: 1) Start with 800 kA, 5.4 T, nel=9e19m-2, to demonstrate that steady EDA's can be obtained at nominal conditions (not so evident this campaign). Moderate RF power, ~ 2.5 MW. Discharge such as 1030516003 (or others this day) suitable for waveforms and RF coupling. 2) Lower current to 580 kA, as on 1021106022, still with ~2.5 MW RF. Progressively reduce target density, monitoring 'EDAness' of discharge; stop at minimum steady density. 3) Raise RF power shot to shot, aiming for 4 MW (or maximum at which steady RF can be maintained). It will be of interest to see - how hot we can get the core and edge. - whether raising Te (and therefore dropping edge collisionality) causes us to lose EDA, and/or generate some type of ELM. Good edge TS will be important, and it is highly desirable to have PCI and/or reflectometry available to monitor QC mode; this should be new ground in the mode operational space. This should not, in principle, take an entire run day (famous last words). If there is remaining time, or if for some reason the H-mode is not cooperating, spend remaining discharges exploring a closely related aim: making low density, high temperature L-mode plasmas, also a candidate LH target: 4) Make upper null discharge; 1030508013 would be a good starting point. Add ICRF at progressively higher power to find limit of L-H threshold (about 3.3 MW?) and also limits of power handling near upper x-point. Scan target density and power to map out the available n-T space. Results: In general, we did manage to follow and complete much of the above run plan (parts 1-3), despite rather high H/D and radiation levels which probably impeded performance. Shots 1-5 we ran a 5.4 T, 800 kA, moderate ne plasma, which was not steady EDA despite some observed QC mode. Shot 6 we reloaded a previous steady EDA discharge, 1021106001, which was much better despite nominally very similar parameters; would be worth looking to see what the subtle differences were! PCI was unavailable today but several reflectometer channels were working and gave good measurements of the QC mode which was very valuable for this run - thanks Nils. We then started reducing Ip to 700 kA (shot 8) and 600 kA (shot 9), with RF at 3 MW. From then on we mainly varied target density (lowering it) and RF power (raising it). Typically the first H-mode had the higher temperatures and stored energy; after the first RF trip and/or back transition the plasma entered a cooler, ELMy phase. Shots 12-15 are good examples; in the early period of shot 14 edge Te exceeded 700 eV and the core 5 keV, with W=106 kJ and H ~ 2 despite high H/D; there was a QC mode though ne was not entirely steady. Neped was 1.3-1.4 x 10^20 m-3, good for future LH. However, there were copious impurity injections, apparently from divertor hot spots; later strike point tweaks seemed to fix that. Shot 15 disrupted. Shot 16 was slightly lower density and was ELM-free with no QC mode. For shots 18-24 target nel was slightly raised, to 6e19 m-2. This gave steadier, more obviously EDA H-modes. Slightly cooler but still quite good performance, with nped 1.5e20 m-3, Tped 400 eV, W=90 kJ, and Te0 3.8 keV. All shots had clear QCmodes. Shots 25-27 had lower density and returned to very hot, if more transient, conditions; W=115-125 kJ. Should be a nice scan of QC mode properties. Sighting of QC mode were reported on several shots by BES, Active MHD and FRCECE (Bt was raised to 5.7 T on shots 24-26 to put edge channels in pedestal). ALso possible 1.85 MHz mode on magnetics. Shots 32-33 had nel 4.6 e19 m-2, lost the QC mode and definite ELM-free. Shot 34 returned to the target of previously 'weak EDA' shots (5e19), but with lower RF (2.6-2 MW). H-Modes were clearly ELM-free! All in all, we accomplished most of the goals of the run, with hot, low ne, good confinement plasma suitable for ACCOME modelling (shots 14 and 20 good candidates for modelling). We anticipare they will show good LH efficiency. We also got considerable data on QC mode properties and existence space in the low ne, low Ip regime which bear further analysis. One can anticipate that performance would be even better in these regimes after a more recent boronization (H/D was up to 0.2 by the end of the day, and Prad was typically rising to PRF even with QC mode); would be worth revisiting these conditions in the future. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:18:037PM |
| Author: To Be Determined |
| Physop Summary MP#327 Low ne EDA targets PO Hutch SL Hubbard Summary _______ We started with very ragged machine and RF conditions but after some tuning obtained some fairly impressive results with H-factors of 2 at 0.6MA,and completed most of the proposal. See Session Leader for physics. Heating seemed effective above a temperature of about 3keV despite there being an H/D ratio of 0.1. It seemed as if this was a non-linear effect. At the lower end of the EDA boundary was where the performance was best (consistent with results that date back to at least 1996). A couple of shots without QC mode were obtained with nl04 at about 0.35e20. At nl04=0.5e20 QC mode was present although the density was not well controlled. Radiation was significant, but there were some signs that it could be overcome. Argon puff of 40ms inherited from a prior shot was way too much: 25ms satisfied JR. RF worked tolerably well with a number of sustained 4MW shots. It killed only a handful of plasmas. Startup was excellent. One fizzle only, which was caused by the disruption caused by interferometer failure. The final shot was designed as a test of whether lower power make the plasma "more EDA". The previous observation that it is in fact the other way around was confirmed. More RF power leads to a "more EDA" like plasma with other settings the same. Scorecard _________ Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax 1 1.965 0.796 2 1.960 0.795 3 1.964 0.798 4 1.968 0.800 5 1.968 0.800 6 1.964 0.818 7 1.962 0.811 8 1.964 0.762 9 1.964 0.662 10 1.970 0.680 11 1.973 0.653 12 1.973 0.647 13 1.971 0.644 14 1.973 0.640 15 0.790 0.640 16 0.955 0.647 17 1.231 0.641 18 1.972 0.636 19 1.972 0.632 20 1.971 0.636 21 1.971 0.637 22 1.971 0.638 23 1.971 0.638 24 1.973 0.643 25 0.913 0.635 26 1.972 0.626 27 1.971 0.645 28 1.972 0.631 29 1.970 0.624 30 0.669 0.618 31 0.000 0.030 32 1.170 0.647 33 1.971 0.625 34 1.972 0.626 Finished summary for 1030530 Total of 34 shots. 34 shots. 33 plasmas. 1 fizzles. 0 duds. Details _______ ---------------------------------------------------------------------------- 1030530xxx hutch PHYSICS_OPERATOR May 30 2003 8:41:03:320AM . . . . . . . . . . . . . . . . . . . . Load segment 2 from 1030516003 0.8 MA single null. Import segment 3 from yesterday. Copy A-coil programming across. Load Clean. ---------------------------------------------------------------------------- 1030530001 hutch PHYSICS_OPERATOR May 30 2003 9:23:26:346AM . . . . . . . . . . . . . . . . . . . . Plasma not steady eda yet. RXL to 0 from 1cm to increase triangularity. Rcur to .661 from .664 to increase outer gap. ---------------------------------------------------------------------------- 1030530002 hutch PHYSICS_OPERATOR May 30 2003 9:37:55:326AM . . . . . . . . . . . . . . . . . . . . Plasma. RF trips out causing back transitions. Bounce on startup. EF3 voltag to 2600 from 2550 at 12ms. J-port tripping is reported to be associated with high neutral pressure. So reduce nl04 to .75 to reduce it. ---------------------------------------------------------------------------- 1030530004 hutch PHYSICS_OPERATOR May 30 2003 10:02:53:490AM . . . . . . . . . . . . . . . . . . . . Plasma. EF3 Voltage to 2650. Lower nl04 some more to .71 ---------------------------------------------------------------------------- 1030530004 hutch PHYSICS_OPERATOR May 30 2003 10:14:33:790AM . . . . . . . . . . . . . . . . . . . . Plasma. Solved the bounce problem. Working on prad main. Brian Y fixes a bug in program. No changes ---------------------------------------------------------------------------- 1030530005 hutch PHYSICS_OPERATOR May 30 2003 10:25:25:626AM . . . . . . . . . . . . . . . . . . . . Plasma Load 1021106001 seg 2 to seg2 Fiddle with bolofeed. Set a-coil trace correctly. ---------------------------------------------------------------------------- 1030530006 hutch PHYSICS_OPERATOR May 30 2003 10:39:09:810AM . . . . . . . . . . . . . . . . . . . . Looks better, but there are type III elms. RF stayed on. ---------------------------------------------------------------------------- 1030530007 hutch PHYSICS_OPERATOR May 30 2003 10:57:02:130AM . . . . . . . . . . . . . . . . . . . . Plasma. Repeated shot 6 quite well. Ip to 0.7MA. ---------------------------------------------------------------------------- 1030530008 hutch PHYSICS_OPERATOR May 30 2003 11:09:40:570AM . . . . . . . . . . . . . . . . . . . . Plasma OH1V to 150V from 250V at .15s. Ip to .6MA Argon puff to 25ms from 40ms. Load ---------------------------------------------------------------------------- 1030530009 hutch PHYSICS_OPERATOR May 30 2003 11:26:12:733AM . . . . . . . . . . . . . . . . . . . . Plasma Fill puff to 24ms. OH1V to 150 at .3s nl04 to .6 from .8 ---------------------------------------------------------------------------- 1030530010 hutch PHYSICS_OPERATOR May 30 2003 11:38:47:923AM . . . . . . . . . . . . . . . . . . . . Plasma. Sustained H mode. OH1V to 100V at .15s NL04 to .5 ---------------------------------------------------------------------------- 1030530011 hutch PHYSICS_OPERATOR May 30 2003 12:24:56:130PM . . . . . . . . . . . . . . . . . . . . Plasma. This shot really heated till the RF tripped. ---------------------------------------------------------------------------- 1030530014 hutch PHYSICS_OPERATOR May 30 2003 12:35:09:436PM . . . . . . . . . . . . . . . . . . . . Good plasma till an injection at .74s. ---------------------------------------------------------------------------- 1030530015 hutch PHYSICS_OPERATOR May 30 2003 12:53:07:003PM . . . . . . . . . . . . . . . . . . . . Plasma disrupts at .79 after an injection at .73. This very similar result. We see hot spot in the divertor that explodes into the plasma. 4.4MW with good performance prior to injection. No pcs changes. Lower power. ---------------------------------------------------------------------------- 1030530016 hutch PHYSICS_OPERATOR May 30 2003 1:08:45:840PM . . . . . . . . . . . . . . . . . . . . Plasma Disrupts at .94s. Move rxl to .013 from .011 to try to put the strike point higher up the plate. ---------------------------------------------------------------------------- 1030530017 hutch PHYSICS_OPERATOR May 30 2003 1:25:11:133PM . . . . . . . . . . . . . . . . . . . . Plasma till 1.2s. nl04 to .55 ---------------------------------------------------------------------------- 1030530018 hutch PHYSICS_OPERATOR May 30 2003 1:44:40:290PM . . . . . . . . . . . . . . . . . . . . Full length shot. nl04 to .6 Raise zxl 0.5cm. ---------------------------------------------------------------------------- 1030530019 hutch PHYSICS_OPERATOR May 30 2003 2:20:00:723PM . . . . . . . . . . . . . . . . . . . . Plasma. Got rid of injections but it is not clear whether that is because of the strike-point tweaks or density increase or lower RF. No pcs changes. ---------------------------------------------------------------------------- 1030530020 hutch PHYSICS_OPERATOR May 30 2003 2:20:09:960PM . . . . . . . . . . . . . . . . . . . . Plasma ---------------------------------------------------------------------------- 1030530021 hutch PHYSICS_OPERATOR May 30 2003 2:20:16:926PM . . . . . . . . . . . . . . . . . . . . Plasma ---------------------------------------------------------------------------- 1030530022 hutch PHYSICS_OPERATOR May 30 2003 2:20:23:210PM . . . . . . . . . . . . . . . . . . . . Plasma ---------------------------------------------------------------------------- 1030530023 hutch PHYSICS_OPERATOR May 30 2003 2:44:05:840PM . . . . . . . . . . . . . . . . . . . . Plasma TF current to 157 kA. Supposed to be for the heterdyne ECE data. ---------------------------------------------------------------------------- 1030530024 hutch PHYSICS_OPERATOR May 30 2003 2:55:50:253PM . . . . . . . . . . . . . . . . . . . . Plasma. EF3V to 2700 at 12ms. nl04 to 5 from 6. ---------------------------------------------------------------------------- 1030530025 hutch PHYSICS_OPERATOR May 30 2003 3:15:54:580PM . . . . . . . . . . . . . . . . . . . . Disrupts at .91s. This is caused by fireworks in the top left of j-port. nl04 to ..55 ---------------------------------------------------------------------------- 1030530026 hutch PHYSICS_OPERATOR May 30 2003 3:27:40:256PM . . . . . . . . . . . . . . . . . . . . Plasma. H-factor=2 in this shot. Very hot and see a QC mode, but density still rising. I-TF to 148kA ---------------------------------------------------------------------------- 1030530027 hutch PHYSICS_OPERATOR May 30 2003 3:40:19:913PM . . . . . . . . . . . . . . . . . . . . Plasma similar. RF stays on. Fill puff to 27ms. nl04 to .5 ---------------------------------------------------------------------------- 1030530028 hutch PHYSICS_OPERATOR May 30 2003 4:10:54:046PM . . . . . . . . . . . . . . . . . . . . Plasma. quite good. RF trips after first. nl04 to .45 ---------------------------------------------------------------------------- 1030530030 hutch PHYSICS_OPERATOR May 30 2003 4:19:17:170PM . . . . . . . . . . . . . . . . . . . . Killed by interferometer running amok. Go to preprogrammed gas. ---------------------------------------------------------------------------- 1030530031 hutch PHYSICS_OPERATOR May 30 2003 4:40:35:243PM . . . . . . . . . . . . . . . . . . . . Fizzle. ---------------------------------------------------------------------------- 1030530032 hutch PHYSICS_OPERATOR May 30 2003 4:51:55:360PM . . . . . . . . . . . . . . . . . . . . Plasma got nl04=.36, ELM free. J-port blows us away at 1.17s. Raise gas program to 25 from 17. ---------------------------------------------------------------------------- 1030530033 hutch PHYSICS_OPERATOR May 30 2003 5:02:23:866PM . . . . . . . . . . . . . . . . . . . . Plasma. Did not disrupt but we still got a low density and apparently ELM free. Reload segment 2 from shot 27. ---------------------------------------------------------------------------- 1030530034 hutch PHYSICS_OPERATOR May 30 2003 5:07:24:073PM . . . . . . . . . . . . . . . . . . . . Plasma. Supposed to be a repeat of the nl04=0,5 shot with lower power. Mossessian says this will be MORE EDA. I say it will be less EDA. And I AM RIGHT!!! |
| Session Leader Comments | |||
| May 30 2003 09:04:38:060AM | Amanda Hubbard | Physics run plan for 1030530 MP#327 Low ne EDA targets The primary goal of this run is to complete Part B as specified in MP#327: Increasing power, and temperature, in low density EDA H-modes so as to demonstrate an attractive LHCD target. The run follows on the previous successful run day on 1021106, which essentially completed Part A: demonstrating a lower density, steady EDA H-mode at 600 kA. On that day we were limited to 2 MW at 80 MHz. Plan: 1) Start with 800 kA, 5.4 T, nel=9e19m-2, to demonstrate that steady EDA's can be obtained at nominal conditions (not so evident this campaign). Moderate RF power, ~ 2.5 MW. Discharge such as 1030516003 (or others this day) suitable for waveforms and RF coupling. 2) Lower current to 580 kA, as on 1021106022, still with ~2.5 MW RF. Progressively reduce target density, monitoring 'EDAness' of discharge; stop at minimum steady density. 3) Raise RF power shot to shot, aiming for 4 MW (or maximum at which steady RF can be maintained). It will be of interest to see - how hot we can get the core and edge. - whether raising Te (and therefore dropping edge collisionality) causes us to lose EDA, and/or generate some type of ELM. Good edge TS will be important, and it is highly desirable to have PCI and/or reflectometry available to monitor QC mode; this should be new ground in the mode operational space. This should not, in principle, take an entire run day (famous last words). If there is remaining time, or if for some reason the H-mode is not cooperating, spend remaining discharges exploring a closely related aim: making low density, high temperature L-mode plasmas, also a candidate LH target: 4) Make upper null discharge; 1030508013 would be a good starting point. Add ICRF at progressively higher power to find limit of L-H threshold (about 3.3 MW?) and also limits of power handling near upper x-point. Scan target density and power to map out the available n-T space. | |
| May 30 2003 09:14:27:477AM | 1030530001 | Amanda Hubbard | Good shot, 780 kA, 5.4 T, target nel 10^20 m-2. 2.8 MW RF, only a few trips. However, get multiple H-Modes, not apparently EDA. |
| May 30 2003 09:27:32:807AM | 1030530002 | Amanda Hubbard | H-modes still seem distinctly ELM-free. Several back-transitions, some possible correlated with RF trips. Retune and try again. |
| May 30 2003 09:49:25:020AM | 1030530003 | Amanda Hubbard | Somewhat better, D alpha showing signs of rising. But, so are ne and Prad, multiple H-modes. |
| May 30 2003 10:33:19:747AM | 1030530004 | Amanda Hubbard | Still multiple H-modes, with high Prad and RF trips. |
| May 30 2003 10:19:16:483AM | 1030530005 | Amanda Hubbard | First h-mode looks OK, until RF trips. But, Prad still high, and rising. Next, reload shot 1021106001, a nice EDA with nominally similar parameters. |
| May 30 2003 10:33:01:763AM | 1030530005 | Amanda Hubbard | Still multiple H-modes, with high Prad and RF trips. |
| May 30 2003 10:32:05:313AM | 1030530006 | Amanda Hubbard | Reloaded shot 1021106001, a nice EDA with nominally similar parameters. Much better, started out as decent EDA! First RF trip results in Type III ELMs for the rest of the shot, presumably due to high Prad. |
| May 30 2003 10:47:06:370AM | 1030530007 | Amanda Hubbard | Remarkably similar to shot 6, down to the RF trip. This may be as good as it gets, so go down to 700 kA for next shot. |
| May 30 2003 11:01:09:747AM | 1030530007 | Amanda Hubbard | 700 kA. H-mode looks quite similar, starting EDA but with rising ne and Prad. This time, reverts to ELMs before the first RF trip. Go to 600 kA for next shot. |
| May 30 2003 11:32:54:250AM | 1030530010 | Amanda Hubbard | 600 kA. Looks better, if not great; Nils sees a QC mode through most of the H-mode. nel 0.7-1.22e20, nebar steady at 2e20 m-3. ne95~ 1.7e20 |
| May 30 2003 11:49:26:057AM | 1030530011 | Amanda Hubbard | Goot shot. Definite QC mode. First period has very high Te's. Evidence of some MHD just before the trip. Leave plasma alone, retry RF. |
| May 30 2003 12:15:04:467PM | 1030530012 | Amanda Hubbard | Series of H-modes, first looks ELM-free, latter ones more EDAish. How3ever, QC mode seen on reflectometer on all of them. Getting very high Te (4 keV) and W (96 kJ). H-factors ~ 2. Keep this plasma, increase power. |
| May 30 2003 12:15:51:370PM | 1030530012 | Amanda Hubbard | Similar series of H-modes, 3 MW RF. Getting very high Te (4.7 keV) and W (108 kJ). |
| May 30 2003 12:16:40:227PM | 1030530013 | Amanda Hubbard | Similar series of H-modes, 3 MW RF. Getting very high Te (4.7 keV) and W (108 kJ). HOwever, this is transient; Prad gets to 3 MW, ending the first H-mode. |
| May 30 2003 12:32:54:783PM | 1030530014 | Amanda Hubbard | Good shot. First H-mode looks pretty good, steady edge Te, until big injection at 0.739 secs. 3.4 MW RF, pretty steady. 4.4 keV Te0, 106 Kj. repeat, pushing up Prf and hoping for no injection. |
| May 30 2003 12:47:36:377PM | 1030530014 | Amanda Hubbard | 4.4 MW RF, Starts off well until first RF trip, followed shortly thereafter by a big injection from divertror region, 5.2 keV Te0, 124 Kj. repeat, lowering Prf and hoping harder for no injection. |
| May 30 2003 12:48:05:750PM | 1030530015 | Amanda Hubbard | 4.4 MW RF, Starts off well until first RF trip, followed shortly thereafter by a big injection from divertror region, 5.2 keV Te0, 124 Kj. repeat, lowering Prf and hoping harder for no injection. |
| May 30 2003 01:05:25:960PM | 1030530016 | Amanda Hubbard | This H-mode was more ELM-free, no clear QC mode and ne, Prad rising. Density at LH trasnsition a bit lower, though target was the same; perhaps RF is now outgassing less. Discharge again killed by a big injection. 3.4 MW, but still Te0 5.2 keV, Te9 690 eV, 108 kJ. Nel 5.6-9.6e19 m-2. |
| May 30 2003 01:17:03:447PM | 1030530017 | Amanda Hubbard | Series of H-modes, not very steady. Disrupts ~ 1.2 secs. 3.1 MW, with some trips. Te0 4.3 keV, Te9 520 eV, rises then cools. 93 kJ. |
| May 30 2003 01:28:23:470PM | 1030530018 | Amanda Hubbard | Series of H-modes, not very steady. No disruption, but a series of injections taking a bite out of edge Te. 3.3 MW, with many trips. Te0 4.2 keV, Te9 510 eV, rises then cools. 91 kJ. Next shot raise nel target a bit more. |
| May 30 2003 01:44:07:417PM | 1030530019 | Amanda Hubbard | Higher target ne, Series of more EDA H-modes. Te0 3.4 keV, Te9 400 eV, rises then cools. 78 kJ. Next shot raise RF power. |
| May 30 2003 01:56:19:233PM | 1030530020 | Amanda Hubbard | First H-mode looks very nice and steady. 3.7 MW, 1.1e20 m-2, presumed EDA. Te0 3.8 keV, Te9 420 eV 90 kJ. Prad ~ steady at 2 MW. Next shot raise RF power some more. |
| May 30 2003 02:10:58:260PM | 1030530021 | Amanda Hubbard | Good shot - plasma is stedy when the RF is (esp ~ 0.8-1.0 secs) First H-mode looks very nice and steady. 34.2 MW, 1.1e20 m-2, presumed EDA. Te0 3.8 keV, Te9 390 eV 84 kJ. Prad ~ steady at 1.6 MW. Try again, hopefully avoiding early RF trips. |
| May 30 2003 02:33:02:443PM | 1030530023 | Amanda Hubbard | Rather similar. Decent EDA but still a lot of trips on J-port. 3.7 MW. Next shot, raise Bt to 5.7 T so FRECE can see QC mode. |
| May 30 2003 02:55:32:410PM | 1030530024 | Amanda Hubbard | 5.7 T. Still a lot of trips, still looks EDA. next shot, give in to Ian and go back down in nel- taget (to 5e19 m-2), see if ELM-free and/or injections return, and if W goes back up. |
| May 30 2003 03:04:35:890PM | 1030530025 | Amanda Hubbard | Injections do return, with a vengeance. Go to intermediate ne, 5.5e20 m-2 |
| May 30 2003 03:18:53:543PM | 1030530026 | Amanda Hubbard | Much better, First H-mode gets 120 kJ, 5.8 keV. QC mode seen, though ne rising. TS sees Tped 500 eV. ECE sees 5.8 kev. Next shot back to 5.4 T. |
| May 30 2003 03:45:48:840PM | 1030530027 | Amanda Hubbard | Good shot - 4 MW for long period. Early phase gets very hot. QC mode seen, ne not so steady. lowe ne for next shot. 115 kJ, Te8 800 eV. |
| May 30 2003 03:49:04:973PM | 1030530028 | Amanda Hubbard | Good shot quite similar to 27 - 4 MW for long period. Early phase still very hot. QC mode seen, ne not so steady. lowe ne for next shot. 115 kJ, Te8 800 eV. No evident injections, though Prad gets near to 3 MW in first H-mode. |
| May 30 2003 04:18:27:860PM | 1030530029 | Amanda Hubbard | Not very different, despite lower nel target. More RF trips. Lower power for next shot, try for steadier. Te8~700 eV, not steady. Nils reports still a nice QC mode on several reflectometer channels. Need to go lower in ne.... |
| May 30 2003 04:16:41:800PM | 1030530030 | Amanda Hubbard | Disrupts early due to TCI feedback failure, ne runaway. |
| May 30 2003 04:41:35:977PM | 1030530032 | Amanda Hubbard | Low target density nel 4.6e19 at L-H, up to 9e19 m-2. First H-mode is definitely ELM-free, not a hint of QC mode. Next shot, up in ne a bit. Te9 transiently 680 eV. But, RF trips early and often. |
| May 30 2003 05:07:01:793PM | 1030530033 | Amanda Hubbard | Still very low target density nel 4.6e19 at L-H, up to 9e19 m-2. Series of ELM-free H-modes. RF better, 3.7 MW. For final shot, return to nel target of 5e19 (as on 27, 28), but use lower PRF ~ 2.5 MW. Dmitri predicts we will see 'more EDA' plasma. We'll see. |
| May 30 2003 05:07:39:917PM | 1030530034 | Amanda Hubbard | HIgher target density, same as shots 27,28, Lower RF. Definitely ELM-free! |
| Physics Operator Comments | |||
| May 30 2003 08:41:03:320AM | Ian Hutchinson | Load segment 2 from 1030516003 0.8 MA single null. Import segment 3 from yesterday. Copy A-coil programming across. Load Clean. | |
| May 30 2003 09:23:26:347AM | 1030530001 | Ian Hutchinson | Plasma not steady eda yet. RXL to 0 from 1cm to increase triangularity. Rcur to .661 from .664 to increase outer gap. |
| May 30 2003 09:37:55:327AM | 1030530002 | Ian Hutchinson | Plasma. RF trips out causing back transitions. Bounce on startup. EF3 voltag to 2600 from 2550 at 12ms. J-port tripping is reported to be associated with high neutral pressure. So reduce nl04 to .75 to reduce it. |
| May 30 2003 10:02:53:490AM | 1030530004 | Ian Hutchinson | Plasma. EF3 Voltage to 2650. Lower nl04 some more to .71 |
| May 30 2003 10:14:33:790AM | 1030530004 | Ian Hutchinson | Plasma. Solved the bounce problem. Working on prad main. Brian Y fixes a bug in program. No changes |
| May 30 2003 10:25:25:627AM | 1030530005 | Ian Hutchinson | Plasma Load 1021106001 seg 2 to seg2 Fiddle with bolofeed. Set a-coil trace correctly. |
| May 30 2003 10:39:09:810AM | 1030530006 | Ian Hutchinson | Looks better, but there are type III elms. RF stayed on. |
| May 30 2003 10:57:02:130AM | 1030530007 | Ian Hutchinson | Plasma. Repeated shot 6 quite well. Ip to 0.7MA. |
| May 30 2003 11:09:40:570AM | 1030530008 | Ian Hutchinson | Plasma OH1V to 150V from 250V at .15s. Ip to .6MA Argon puff to 25ms from 40ms. Load |
| May 30 2003 11:26:12:733AM | 1030530009 | Ian Hutchinson | Plasma Fill puff to 24ms. OH1V to 150 at .3s nl04 to .6 from .8 |
| May 30 2003 11:38:47:923AM | 1030530010 | Ian Hutchinson | Plasma. Sustained H mode. OH1V to 100V at .15s NL04 to .5 |
| May 30 2003 12:24:56:130PM | 1030530011 | Ian Hutchinson | Plasma. This shot really heated till the RF tripped. |
| May 30 2003 12:35:09:437PM | 1030530014 | Ian Hutchinson | Good plasma till an injection at .74s. |
| May 30 2003 12:53:07:003PM | 1030530015 | Ian Hutchinson | Plasma disrupts at .79 after an injection at .73. This very similar result. We see hot spot in the divertor that explodes into the plasma. 4.4MW with good performance prior to injection. No pcs changes. Lower power. |
| May 30 2003 01:08:45:840PM | 1030530016 | Ian Hutchinson | Plasma Disrupts at .94s. Move rxl to .013 from .011 to try to put the strike point higher up the plate. |
| May 30 2003 01:25:11:133PM | 1030530017 | Ian Hutchinson | Plasma till 1.2s. nl04 to .55 |
| May 30 2003 01:44:40:290PM | 1030530018 | Ian Hutchinson | Full length shot. nl04 to .6 Raise zxl 0.5cm. |
| May 30 2003 02:20:00:723PM | 1030530019 | Ian Hutchinson | Plasma. Got rid of injections but it is not clear whether that is because of the strike-point tweaks or density increase or lower RF. No pcs changes. |
| May 30 2003 02:20:09:960PM | 1030530020 | Ian Hutchinson | Plasma |
| May 30 2003 02:20:16:927PM | 1030530021 | Ian Hutchinson | Plasma |
| May 30 2003 02:20:23:210PM | 1030530022 | Ian Hutchinson | Plasma |
| May 30 2003 02:44:05:840PM | 1030530023 | Ian Hutchinson | Plasma TF current to 157 kA. Supposed to be for the heterdyne ECE data. |
| May 30 2003 02:55:50:253PM | 1030530024 | Ian Hutchinson | Plasma. EF3V to 2700 at 12ms. nl04 to 5 from 6. |
| May 30 2003 03:15:54:580PM | 1030530025 | Ian Hutchinson | Disrupts at .91s. This is caused by fireworks in the top left of j-port. nl04 to ..55 |
| May 30 2003 03:27:40:257PM | 1030530026 | Ian Hutchinson | Plasma. H-factor=2 in this shot. Very hot and see a QC mode, but density still rising. I-TF to 148kA |
| May 30 2003 03:40:19:913PM | 1030530027 | Ian Hutchinson | Plasma similar. RF stays on. Fill puff to 27ms. nl04 to .5 |
| May 30 2003 04:10:54:047PM | 1030530028 | Ian Hutchinson | Plasma. quite good. RF trips after first. nl04 to .45 |
| May 30 2003 04:19:17:170PM | 1030530030 | Ian Hutchinson | Killed by interferometer running amok. Go to preprogrammed gas. |
| May 30 2003 04:40:35:243PM | 1030530031 | Ian Hutchinson | Fizzle. |
| May 30 2003 04:51:55:360PM | 1030530032 | Ian Hutchinson | Plasma got nl04=.36, ELM free. J-port blows us away at 1.17s. Raise gas program to 25 from 17. |
| May 30 2003 05:02:23:867PM | 1030530033 | Ian Hutchinson | Plasma. Did not disrupt but we still got a low density and apparently ELM free. Reload segment 2 from shot 27. |
| May 30 2003 05:07:24:073PM | 1030530034 | Ian Hutchinson | Plasma. Supposed to be a repeat of the nl04=0,5 shot with lower power. Mossessian says this will be MORE EDA. I say it will be less EDA. And I AM RIGHT!!! |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:02:26:973AM | Plasma | Ok | |
| 2 | 09:17:20:843AM | Plasma | Ok | |
| 3 | 09:33:16:807AM | Plasma | Ok | |
| 4 | 09:46:29:090AM | Plasma | Ok | |
| 5 | 10:03:28:253AM | Plasma | Ok | |
| 6 | 10:19:41:060AM | Plasma | Ok | |
| 7 | 10:35:33:103AM | Plasma | Ok | |
| 8 | 10:48:59:977AM | Plasma | Ok | |
| 9 | 11:04:02:897AM | Plasma | Ok | |
| 10 | 11:18:44:893AM | Plasma | Ok | |
| 11 | 11:32:15:283AM | Plasma | Ok | |
| 12 | 11:51:58:393AM | Plasma | Ok | |
| 13 | 12:07:41:890PM | Plasma | Ok | |
| 14 | 12:20:26:593PM | Plasma | Ok | |
| 15 | 12:33:11:970PM | Plasma | Bad | PF breaker opened during the shot |
| 16 | 12:50:18:197PM | Plasma | Bad | PF breaker open during shot |
| 17 | 01:03:25:027PM | Plasma | Ok | |
| 18 | 01:17:04:917PM | Plasma | Ok | |
| 19 | 01:31:05:837PM | Plasma | Ok | |
| 20 | 01:45:16:460PM | Plasma | Ok | |
| 21 | 02:00:17:397PM | Plasma | Ok | |
| 22 | 02:13:12:553PM | Plasma | Ok | |
| 23 | 02:25:55:493PM | Plasma | Ok | |
| 24 | 02:39:01:820PM | Plasma | Ok | |
| 25 | 02:53:17:867PM | Plasma | Ok | |
| 26 | 03:07:24:897PM | Plasma | Ok | |
| 27 | 03:21:56:817PM | Plasma | Ok | |
| 28 | 03:39:00:137PM | Plasma | Ok | |
| 29 | 03:52:12:810PM | Plasma | Ok | |
| 30 | 04:04:46:373PM | Plasma | Ok | |
| 31 | 04:17:58:547PM | Plasma | Ok | |
| 32 | 04:30:43:563PM | Plasma | Ok | |
| 33 | 04:44:58:220PM | Plasma | Ok | |
| 34 | 05:00:19:183PM | Plasma | Ok | |