| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | John Reardon |
| Physics operator(s): | Robert Granetz,Ian Hutchinson |
| Engineering operator(s): | Frank Silva |
| Engineering Operator Run Comment |
| Hutch/Reardon/Silva |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:17:507PM |
| Author: To Be Determined |
| This run supported MP191, Langmuir Probe E-radial Measurements During RF. Two objectives were pursued simultaneously. The first objective was to check out a diagnostic technique new to tokamaks, the use of quarter-wave stub tuners on swept Langmuir probes to suppress the rectification of RF sheath voltage. Does this technique allow Langmuir probe measurements to be made with accuracy during RF heating in tokamaks? The second objective was to acquire profiles of swept Langmuir probe traces and RF floating potential fluctuations in the edges of RF-heated H-mode plasmas, in order to contribute to the understanding of the H-mode confine- ment barrier. Both objectives were accomplished. The probe was scanned on every shot except shots 1 (fizzle) and 2. The largest RF floating potential fluctuations were found in the nl_04 = 8 10^19 shots (eg 15 and 22), being roughly 15 V RMS, attained on the inward scan about 1 mm from furthest insertion. This is enough to distort probe characteristics, and allow evaluation of the effectiveness of the stubs (analysis in progress). Trophy shots are 15 and 28, when the probe went in during L-mode and came out during H-mode. For 9 shots the L-H transition happened within 20 ms of the full insertion. Probe scanned into EDH mode for another 4 shots. Some of the low-denisty EDH modes had really good RF heating. 2 shots of RF L-mode and 1 of Ohmic L-mode. Calculation of profiles in progress. Run summary: Establish a good fiducial and keep moving the probe in until it generates impurity bursts: shots 2-10 Move probe out and switch antennas: shots 11-13 Density scan: shots 14-21 low density: nl_04 = 8.0 10^19 (shot 15) high density: nl_04 = 1.5 10^20 (shot 21) Low density gives highest RF fields, thus best chance for evaluation of stub tuners. Return there and turn down the gas puff to see if the density will go still lower as the walls pump out. Wall pump-out: shots 22-26 nl_04 decreases from 7.7 10^19 to 5.7 10^19 RF fields not so big as before. Good RF heating. Return to nl_04 = 8.0 10^19 where the RF fields are big and push the probe in further. To boldly go...: shots 27-29 No moly injections, no damage to probe. The machine operated superbly. RF was consistent and reliable: "RF likes EDH mode"--SJ Wukitch. Excellent heating at the low densities. See physop_summary for details. Shot # Description 1 Fizzle 2 5.4T 800kA 1 10^20 EDA H-mode w/1 MW D-port. Most of the fiducial EDA H-modes today seem to pass through "suppressed D-Alpha H-mode" on their way to and from L-mode. 3 Similar. Enable scanning probe. Probe scan in EDH mode at 1.0 sec. No sign of probe related moly. 4 Remove extra D-port ramp. Probe scan in EDH mode @ 1.0 sec. No sign of probe-related moly. 5 Move probe in .093 Scan into EDH mode @ 1.0 No sign of Moly 6 Move probe in .07 Scan into EDH mode @ 1.0 No sign of Moly 7 Move probe in .093 Scan into EDH mode @ 1.0 No sign of Moly increasing flakiness on pot trace so far the rf floating potential fluctuation level has been independent of position during the probe scan 8 Move probe in .093 Scan into EDH mode @1.0. No sign of moly 9 Move probe in .093 Scan into EDH mode @ 1.0 No sign of Moly. 1 hour delay to find and fix loose wire in pot driver circuit. 10 Move probe in .093 Scan into EDH mode @ 1.0. Big (probe) injection of Moly. 11 Change long pulse from D-port to E-port. Move probe out .094 Scan into EDH mode @1.0 Not-so-big probe injection of Moly at 1.0 12 Move probe out .07, change scan time to .77 (look for L-H) Tiny moly injection. L-H happens at .81 (thanks to E-port) 13 Change to long pulse on D-port. Leave probe the same. L-H at .778. RF floating potential fluctuation level still nearly independent of position. 14 Lower density to 8.5 10 19. Leave probe the same More power in RF floating potential fluctuations than before, position dependent. L-H at .786 15 Change scan time to .785. Lower density to 8.0 10 19 L-H transition happens with probe full in (.783 seconds) Power in V_RF^floating still larger than before; much larger during L-mode (inward scan) than H-mode (outward scan). 16 Raise density to 1.15 10 20. Probe scan the same L-H at .795. Power in V_RF^floating decreases. 17 Raise density to 1.25 10 20. Probe scan .795 RF overload at .79. No H-mode 18 Repeat. Nice clean RF! H-mode .81 19 Raise density Probe scan .84 Magnet resistance fault. 20 Repeat. Disrupted at .84. Probe scan screwed up (my fault, gas timing error): full in at .74 and again at .81 and .86 (slightly less far each time) 21 Tweak and repeat. Good shot! nl_04 reaches 1.5 10^20 before H-mode transition at .92 Probe scan @.84 into RF L-mode. V_RF^floating the smallest it's been all day. 22 Go to low density nl_04 = 7.7 10^19 Probe scan @.785, H-mode at .793. V_RF^floating big again. 23 Repeat shot. nl_04= 6.8 10^19. Probe scan @.785, ELM-free H-mode from .81 - .91 (followed by EDH). V_RF^floating considerably diminished, though rising abruptly at L-H transition. 24 Turn off Argon and repeat. Does ELM-free H-mode disappear? Repeat shot. nl_04= 6.3 10^19. ELM-free phase starting at .86. "H=2" --G. Probe scan at .81. 25 Enable Argon and repeat. ELM-free H-mode at .84. Probe scan at .81. This is as close as the probe gets to ELM-free H-mode. 26 Change probe scan to .86 and repeat. L-H transition delayed until .94, well after 2nd antenna turns on. nl_04 = 5.7 10^19 @ probe scan (with 1 MW RF). V_RF^floating follows scanning probe position, being very large at full insertion (cf shot 7). 27 Raise target density to 8 10^19. Dithering in Ohmic phase, followed by L-EDH transition at .78, with Type III elms appearing late. Probe scan at .86 into EDH. 28 Repeat. Move probe in by .07" and scan at .78. L-EDH transition at .785 29 Repeat. Move probe in by .07" and scan at .79. L-EDH at .78 |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:58:253PM |
| Author: To Be Determined |
| Physop Summary. 971218 Langmuir probe E_r measurements. MP191 _____________________________________________________________ SL Reardon PO Hutch (Granetz) Summary _______ An excellent day of plasmas at 0.8MA. Target Density scan from about .6 to 1.6e20. RF powers up to 2.8MW. EDA modes at target densities about .7 or above, radiated power well controlled. ELM free at lowest density with accumulation, but still good confinement. Probe experiments were done. RF antenna interaction seems to be being conditioned; the TV shows increasingly benign behavior. H-factors in the region of 2 were obtained near the lower densities towards the end of the run. What we learned. ________________ The tweaks on OH2 and on the rcur offset seem to have been helpful in getting no fizzles after shot 1. This segment 1 is definitely a keeper. 2.5 hours of D2 ECDC once again disproves the significance of He ECDC for getting EDA. Main chamber neutral pressure is consistently higher than the 1996 campaign for the same plasma density. One psi of Argon and a pulse width of 22ms is just at the level where the radiation is detectable, and just at the level where one can keep Rice quiet (if not necessarily happy.) The highest stored energy had the argon off. As always, early marfe, or at least cold edge, obtained by gas influx, is good for keeping the radiation low. The transition between shot 21 and the suceeding ones is a good example of the time to unload the walls: two or three shots today. Clear synchronism was observed on several occasions between impurity injections, RF trips, and TV antenna explosions. The conclusion is that we still have some antenna conditioning to do. We should also wonder how to avoid the antenna picture-frame edge heating. Scorecard: __________ Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax 1 0.000 0.037 2 1.674 0.833 3 1.672 0.833 4 1.671 0.833 5 1.673 0.833 6 1.672 0.833 7 1.682 0.833 8 1.672 0.833 9 1.673 0.833 10 1.678 0.833 11 1.670 0.833 12 1.673 0.833 13 1.672 0.838 14 1.697 0.838 15 1.689 0.843 16 1.661 0.833 17 1.648 0.828 18 1.636 0.830 19 0.000 0.005 20 0.865 0.830 21 1.610 0.833 22 1.691 0.841 23 1.692 0.843 24 1.269 0.849 25 1.696 0.843 26 1.699 0.851 27 1.692 0.843 28 1.693 0.843 29 1.695 0.843 Finished summary for 971218 Total of 29 shots. 29 shots. 27 plasmas. 1 fizzle. 1 (power-supply)dud. Details: ________ 971218xxx HUTCH PHYSICS_OPERATOR 18-DEC-1997 07:28:36.62 . . . . . . . . . . . . . . . . . . . . Reardon's Miniproposal: Langmuir Probe E_r Measurements. 191. Leak on F-port was found, cuased by freezing. Purged now with Argon. Sparker visual inspecyion shows nothing unpleasant. About 2.5 hrs ECDC in deuterium. Did coldstart. Load the segment 4 fiducial. 7:30 am start. -------------------------------------------------------------------------------- 971218001 HUTCH PHYSICS_OPERATOR 18-DEC-1997 07:42:58.84 44 kA fizzle. Lower OH2 Voltages to 0V at 7ms, from about 18V. Try to fix the index. -------------------------------------------------------------------------------- 971218002 HUTCH PHYSICS_OPERATOR 18-DEC-1997 08:02:45.42 Plasma. Got two pulses of 1MW Rf. EDA mode on both. Some Hards at 0.1s. Lower rcur offset in seg 1 to 6300 from 6500. Import Seg 4 to seg 2. Choose seg 2. -------------------------------------------------------------------------------- 971218003 HUTCH PHYSICS_OPERATOR 18-DEC-1997 08:30:04.55 Plasma. Got 1MW and a 2MW blip. Some injections early. Good ramp-down. Early density is rising quite quickly. EDA. Report that the leak is apparantly not gone. Enable Ar at 1.15psi, 12ms pulse. -------------------------------------------------------------------------------- 971218004 HUTCH PHYSICS_OPERATOR 18-DEC-1997 08:38:16.98 Plasma. Argon does not seem to give us a problem. Still some injections. -------------------------------------------------------------------------------- 971218005 HUTCH PHYSICS_OPERATOR 18-DEC-1997 08:51:25.37 Plasma. Takes longer to develop EDA. Power a little lower. Disable Argon. -------------------------------------------------------------------------------- 971218006 HUTCH PHYSICS_OPERATOR 18-DEC-1997 09:16:06.98 Plasma. Boring! RF power up a bit. EDA earlier. -------------------------------------------------------------------------------- 971218007 HUTCH PHYSICS_OPERATOR 18-DEC-1997 09:31:09.12 Plasma Enable Argon. Rice reports no signal before so put pulse to 15ms. -------------------------------------------------------------------------------- 971218008 HUTCH PHYSICS_OPERATOR 18-DEC-1997 09:44:59.50 Plasma. Rice reports he cannot confirm or deny the presence of Argon. Ar puff to 17 ms. -------------------------------------------------------------------------------- 971218009 HUTCH PHYSICS_OPERATOR 18-DEC-1997 10:35:07.31 Plasma. Seems to have some argon this time but not a lot, and still retains EDA. Long pause for cell access. -------------------------------------------------------------------------------- 971218010 HUTCH PHYSICS_OPERATOR 18-DEC-1997 10:51:24.35 Plasma. Big radiation rise at 1 sec. Reardon's probe goes in at that time. Ar puff to 20ms. -------------------------------------------------------------------------------- 971218011 HUTCH PHYSICS_OPERATOR 18-DEC-1997 11:05:20.81 Plasma. EDA mode might be slightly delayed cf earlier shots. Impurity injection at .98s. Not as severe as last shot. Zenith crashes. Let's hope the data system survives. -------------------------------------------------------------------------------- 971218012 HUTCH PHYSICS_OPERATOR 18-DEC-1997 11:18:34.68 Plasma. Probe in at .77s. The impurity burst is gone. Ar to 22ms. Can't remember if I loaded this. Last store was at 11.09. -------------------------------------------------------------------------------- 971218013 HUTCH PHYSICS_OPERATOR 18-DEC-1997 11:26:42.85 Plasma Lower nl04 to .8e20. Lower puff V to about 36V at .2s, to help. Keep RF on till 1.2s. -------------------------------------------------------------------------------- 971218014 HUTCH PHYSICS_OPERATOR 18-DEC-1997 11:48:14.33 . . . . Plasma. Got .87e20 density. Nice ramp-down of radiation during the extended H-mode. Ratiomatic drops from .25mtorr, previous shot to .12 this shot. Lower puff V some more, to 20 then 15V. -------------------------------------------------------------------------------- 971218015 HUTCH PHYSICS_OPERATOR 18-DEC-1997 12:03:06.72 . . . . Plasma. Got 0.8e20 density. 0.09 mtorr ratiomatic. Slightly higer radiation, but otherwise similar to 14. A couple of shots ago I lowered the early zcyr3 feedback ot 6 proportional. Go up to nl04 demand of 1.25e20. Raise puff to 50V at .2s. -------------------------------------------------------------------------------- 971218016 HUTCH PHYSICS_OPERATOR 18-DEC-1997 12:15:26.94 Plasma. Got 1.15 nl04 at RF turn-on. 0.4 mtorr ratiomatic. Increase puff at .15s, and to 25 V later. nl04 to 1.35e20 -------------------------------------------------------------------------------- 971218017 HUTCH PHYSICS_OPERATOR 18-DEC-1997 12:32:06.56 Plasma. RF trips. No prolonged H-mode. Big early marfe. nl04=1.24e20. Incipient 60Hz zcur instability at 1.1s. Lower zcur P to 4 at .24s. .35 at .778s. -------------------------------------------------------------------------------- 971218018 HUTCH PHYSICS_OPERATOR 18-DEC-1997 12:44:37.60 Plasma. 1.25e20 at .74s.Ratiomatic .56mtorr. Inital current rise has slowed significantly. nl04 to 1.6, increased V. -------------------------------------------------------------------------------- 971218019 HUTCH PHYSICS_OPERATOR 18-DEC-1997 12:48:27.63 Magnet resistance fault. No power supplies. -------------------------------------------------------------------------------- 971218020 HUTCH PHYSICS_OPERATOR 18-DEC-1997 13:07:37.51 Plasma. Disrupts at .8s. growing vertical instability. Got nl06=1.64. Probe went in at .74s. Ratiomatic 1mtorr. Outer gap seems to be slightly larger than before. zcur3 back to 4. gain. -------------------------------------------------------------------------------- 971218021 HUTCH PHYSICS_OPERATOR 18-DEC-1997 13:23:21.32 Plasma. Sustained the marfe to .5s. This seems to be causing or enhancing the vertical problem. Then when marfe disappears, nl04 drops and gets back up to 1.5 at rf-turn-on. H-mode transition at the step up to level 2 RF. Lower nl04 to .6e20. Lower V a lot. -------------------------------------------------------------------------------- 971218022 HUTCH PHYSICS_OPERATOR 18-DEC-1997 13:36:38.36 Plasma. .74e20 density. Inkection oat time of RF trip, 1.18s. Ratiomatic .1mtorr. Gas off most of shot. No vertical problems. 2.8 MW RF, T_e to 3.5kV. -------------------------------------------------------------------------------- 971218023 HUTCH PHYSICS_OPERATOR 18-DEC-1997 13:46:30.63 Plasma. ELM-free phase till .9s. Ratiomatic 0.05mtorr. nl04 .7e20. 150 kJ. Disable Ar. -------------------------------------------------------------------------------- 971218024 HUTCH PHYSICS_OPERATOR 18-DEC-1997 14:04:16.97 Plasma. L-mode for 0.15 s, then a short ELM-free, then an EDA from 0.9 to 1.2 s. Disrupted at 1.25 s. Target nl04=0.6e19 m-2, goes to 1.5e20 during EDA. Hit by a brick. Stored energy flat-topped at 150 kJ (0.8 MA), which gives H=2. Granetz taking over now from Hutch as physop for this last hour of today's run. Next shot: re-enable argon puff. -------------------------------------------------------------------------------- 971218025 HUTCH PHYSICS_OPERATOR 18-DEC-1997 14:24:49.74 Plasma. Two ELM-free H-modes. Target density was same as last shot (nl04=0.6e20 m-2). 150 kJ (momentarily). There was argon on this shot. Z_67_Yag = 3. JT reports seeing stainless steel (Fe and Ni). Next shot: repeat with no changes. Jim Reardon wants to scan ELM-free edges. -------------------------------------------------------------------------------- 971218026 HUTCH PHYSICS_OPERATOR 18-DEC-1997 14:25:23.65 Plasma. L-mode until 0.9 s, then ELM-free H-mode when RF steps up to 2 MW. Next shot: raise target density to nl04=0.8e20 m-2 (from 0.6). -------------------------------------------------------------------------------- 971218027 HUTCH PHYSICS_OPERATOR 18-DEC-1997 14:38:52.20 Plasma. Dithering during much of the ohmic phase. Switches into EDA when RF turns on, then becomes ELMy. 150 kJ. Target density increased to nl04=0.8e20 m-2, as requested. Next shot: no PCS changes -------------------------------------------------------------------------------- 971218028 HUTCH PHYSICS_OPERATOR 18-DEC-1997 14:53:48.20 Plasma. H-alpha characteristics look nearly identical to the previous shot. Jim Reardon moved his probe 2 mm farther in for this shot. Nothing evident on spectroscopy. There is, however, another sighting of nickel (stainless steel) at t=1.11 s, and molybdenum at t=1.2 s (that's the antenna). Next shot: stick probe in another 2 mm further. -------------------------------------------------------------------------------- 971218029 HUTCH PHYSICS_OPERATOR 18-DEC-1997 15:01:24.77 Ian returns. Plasma RF trips. Some rise in radiation at the end of RF. |
| Session Leader Comments |
| Physics Operator Comments | |||
| Dec 18 1997 07:28:36:620AM | Ian Hutchinson | Reardon's Miniproposal: Langmuir Probe E_r Measurements. 191. Leak on F-port was found, cuased by freezing. Purged now with Argon. Sparker visual inspecyion shows nothing unpleasant. About 2.5 hrs ECDC in deuterium. Did coldstart. Load the segment 4 fiducial. 7:30 am start. | |
| Dec 18 1997 07:42:58:840AM | 971218001 | Ian Hutchinson | 44 kA fizzle. Lower OH2 Voltages to 0V at 7ms, from about 18V. Try to fix the index. |
| Dec 18 1997 08:02:45:420AM | 971218002 | Ian Hutchinson | Plasma. Got two pulses of 1MW Rf. EDA mode on both. Some Hards at 0.1s. Lower rcur offset in seg 1 to 6300 from 6500. Import Seg 4 to seg 2. Choose seg 2. |
| Dec 18 1997 08:30:04:550AM | 971218003 | Ian Hutchinson | Plasma. Got 1MW and a 2MW blip. Some injections early. Good ramp-down. Early density is rising quite quickly. EDA. Report that the leak is apparantly not gone. Enable Ar at 1.15psi, 12ms pulse. |
| Dec 18 1997 08:38:16:980AM | 971218004 | Ian Hutchinson | Plasma. Argon does not seem to give us a problem. Still some injections. |
| Dec 18 1997 08:51:25:370AM | 971218005 | Ian Hutchinson | Plasma. Takes longer to develop EDA. Power a little lower. Disable Argon. |
| Dec 18 1997 09:16:06:980AM | 971218006 | Ian Hutchinson | Plasma. Boring! RF power up a bit. EDA earlier. |
| Dec 18 1997 09:31:09:120AM | 971218007 | Ian Hutchinson | Plasma Enable Argon. Rice reports no signal before so put pulse to 15ms. |
| Dec 18 1997 09:44:59:500AM | 971218008 | Ian Hutchinson | Plasma. Rice reports he cannot confirm or deny the presence of Argon. Ar puff to 17 ms. |
| Dec 18 1997 10:35:07:310AM | 971218009 | Ian Hutchinson | Plasma. Seems to have some argon this time but not a lot, and still retains EDA. Long pause for cell access. |
| Dec 18 1997 10:51:24:350AM | 971218010 | Ian Hutchinson | Plasma. Big radiation rise at 1 sec. Reardon's probe goes in at that time. Ar puff to 20ms. |
| Dec 18 1997 11:05:20:810AM | 971218011 | Ian Hutchinson | Plasma. EDA mode might be slightly delayed cf earlier shots. Impurity injection at .98s. Not as severe as last shot. Zenith crashes. Let's hope the data system survives. |
| Dec 18 1997 11:18:34:680AM | 971218012 | Ian Hutchinson | Plasma. Probe in at .77s. The 1s impurity burst is gone. Ar to 22ms. Can't remember if I loaded this. Last store was at 11.09. |
| Dec 18 1997 11:26:42:850AM | 971218013 | Ian Hutchinson | Plasma Lower nl04 to .8e20. Lower puff V to about 36V at .2s, to help. Keep RF on till 1.2s. |
| Dec 18 1997 11:48:14:330AM | 971218014 | Ian Hutchinson | Plasma. Got .87e20 density. Nice ramp-down of radiation during the extended H-mode. Ratiomatic drops from .25mtorr, previous shot to .12 this shot. Lower puff V some more, to 20 then 15V. |
| Dec 18 1997 12:03:06:720PM | 971218015 | Ian Hutchinson | Plasma. Got 0.8e20 density. 0.09 mtorr ratiomatic. Slightly higer radiation, but otherwise similar to 14. A couple of shots ago I lowered the early zcyr3 feedback ot 6 proportional. Go up to nl04 demand of 1.25e20. Raise puff to 50V at .2s. |
| Dec 18 1997 12:15:26:940PM | 971218016 | Ian Hutchinson | Plasma. Got 1.15 nl04 at RF turn-on. 0.4 mtorr ratiomatic. Increase puff at .15s, and to 25 V later. nl04 to 1.35e20 |
| Dec 18 1997 12:32:06:560PM | 971218017 | Ian Hutchinson | Plasma. RF trips. No prolonged H-mode. Big early marfe. nl04=1.24e20. Incipient 60Hz zcur instability at 1.1s. Lower zcur P to 4 at .24s. .35 at .778s. |
| Dec 18 1997 12:44:37:600PM | 971218018 | Ian Hutchinson | Plasma. 1.25e20 at .74s.Ratiomatic .56mtorr. Inital current rise has slowed significantly. nl04 to 1.6, increased V. |
| Dec 18 1997 12:48:27:630PM | 971218019 | Ian Hutchinson | Magnet resistance fault. No power supplies. |
| Dec 18 1997 01:07:37:510PM | 971218020 | Ian Hutchinson | Plasma. Disrupts at .8s. growing vertical instability. Got nl06=1.64. Probe went in at .74s. Ratiomatic 1mtorr. Outer gap seems to be slightly larger than before. zcur3 back to 4. gain. |
| Dec 18 1997 01:23:21:320PM | 971218021 | Ian Hutchinson | Plasma. Sustained the marfe to .5s. This seems to be causing or enhancing the vertical problem. Then when marfe disappears, nl04 drops and gets back up to 1.5 at rf-turn-on. H-mode transition at the step up to level 2 RF. Lower nl04 to .6e20. Lower V a lot. |
| Dec 18 1997 01:36:38:360PM | 971218022 | Ian Hutchinson | Plasma. .74e20 density. Inkection oat time of RF trip, 1.18s. Ratiomatic .1mtorr. Gas off most of shot. No vertical problems. 2.8 MW RF, T_e to 3.5kV. |
| Dec 18 1997 01:46:30:630PM | 971218023 | Ian Hutchinson | Plasma. ELM-free phase till .9s. Ratiomatic 0.05mtorr. nl04 .7e20. 150 kJ. Disable Ar. |
| Dec 18 1997 02:04:16:970PM | 971218024 | Ian Hutchinson | Plasma. L-mode for 0.15 s, then a short ELM-free, then an EDA from 0.9 to 1.2 s. Disrupted at 1.25 s. Target nl04=0.6e19 m-2, goes to 1.5e20 during EDA. Stored energy flattopped at 150 kJ (0.8 MA), which gives H=2. Granetz taking over now from Hutch as physop for this last hour of today's run. Next shot: re-enable argon puff. |
| Dec 18 1997 02:24:49:740PM | 971218025 | Ian Hutchinson | Plasma. Two ELM-free H-modes. Target density was same as last shot (nl04=0.6e20 m-2). 150 kJ (momentarily). There was argon on this shot. Z_67_Yag = 3. JT reports seeing stainless steel (Fe and Ni). Next shot: repeat with no changes. Jim Reardon wants to scan ELM-free edges. |
| Dec 18 1997 02:25:23:650PM | 971218026 | Ian Hutchinson | Plasma. L-mode until 0.9 s, then ELM-free H-mode when RF steps up to 2 MW. Next shot: raise target density to nl04=0.8e20 m-2 (from 0.6). |
| Dec 18 1997 02:38:52:200PM | 971218027 | Ian Hutchinson | Plasma. Dithering during much of the ohmic phase. Switches into EDA when RF turns on, then becomes ELMy. 150 kJ. Target density increased to nl04=0.8e20 m-2, as requested. Next shot: no PCS changes |
| Dec 18 1997 02:53:48:200PM | 971218028 | Ian Hutchinson | Plasma. H-alpha characteristics look nearly identical to the previous shot. Jim Reardon moved his probe 2 mm farther in for this shot. Nothing evident on spectroscopy. There is, however, another sighting of nickel (stainless steel) at t=1.11 s, and molybdenum at t=1.2 s (that's the antenna). Next shot: stick probe in another 2 mm further. |
| Dec 18 1997 03:01:24:770PM | 971218029 | Ian Hutchinson | Ian returns. Plasma RF trips. Some rise in radiation at the end of RF. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 07:33:51:210AM | Plasma | Ok | no faults |
| 2 | 07:45:23:330AM | Plasma | Ok | no faults |
| 3 | 08:01:22:350AM | Plasma | Ok | no faults |
| 4 | 08:19:25:060AM | Plasma | Ok | |
| 5 | 08:34:36:770AM | Plasma | Ok | |
| 6 | 08:49:40:810AM | Plasma | Ok | |
| 7 | 09:08:27:950AM | Plasma | Ok | |
| 8 | 09:20:41:270AM | Plasma | Ok | |
| 9 | 09:36:07:840AM | Plasma | Ok | |
| 10 | 10:35:58:300AM | Plasma | Ok | |
| 11 | 10:48:53:120AM | Plasma | Ok | |
| 12 | 11:00:52:270AM | Plasma | Ok | |
| 13 | 11:17:21:390AM | Plasma | Ok | |
| 14 | 11:31:51:010AM | Plasma | Ok | |
| 15 | 11:46:55:380AM | Plasma | Ok | |
| 16 | 12:01:12:850PM | Plasma | Ok | |
| 17 | 12:16:03:030PM | Plasma | Ok | |
| 18 | 12:29:41:060PM | Plasma | Ok | |
| 19 | 12:43:07:160PM | Plasma | Bad | mag resist fault |
| 20 | 12:51:37:150PM | Plasma | Ok | |
| 21 | 01:05:44:260PM | Plasma | Ok | |
| 22 | 01:21:55:890PM | Plasma | Ok | |
| 23 | 01:34:25:010PM | Plasma | Ok | |
| 24 | 01:47:37:530PM | Plasma | Ok | |
| 25 | 02:01:06:570PM | Plasma | Ok | |
| 26 | 02:16:15:670PM | Plasma | Ok | |
| 27 | 02:29:28:040PM | Plasma | Ok | |
| 28 | 02:42:19:280PM | Plasma | Ok | |
| 29 | 02:56:36:270PM | Plasma | Ok | |