| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Jim Terry |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Frank Silva |
| Engineering Operator Run Comment |
| MP 221A/Granetz/Silva |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:20:163PM |
| Author: To Be Determined |
| The purpose of the first half of the 990416 run is detatiled in MP 221A. Briefly it is to vary the opacity of the D_0 Lyman lines by changing the magnetic field strength, thereby changing the Zeeman splitting of the lines, thereby possibly affecting the opacity. The plan was to 1) Make a (diverted) plasma (load shot 990331029). 2) Make a reproducible, inner wall-limited plasma with a stable midplane MARFE (we may need to induce the MARFE by a D_2 gas puff from the midplane NINJA capillary (Load shot 980210035, starting with I_p at 800 kA, but with no loop voltage modulation.) If we get this discharge at 800 kA then we will drop the plasma current to 600 kA. 3) ramp the toroidal field from 5.4 T down to 2.7 T, with the ramp starting at ~ 0.6 s, ie ~200 ms after the MARFE developes. The B_t ramp rate should be as fast as possible. q_95 will go from ~5.6 at 5.4 T to 2.8 at 2.7 T. 4) We will run this shot until we have a data set from all the spectroscopic diagnostics (VUV, Chromex, U Md spectrometer, H/D ratio, reticons). 5) If time permits, we want to make a stable midplane MARFE in a DIVERTED magnetic configuration. To do this we want to load segment 1 from shot 980122038 for the gas programming and segment 2 from 990331029. (Start at 800 kA. If OK, then drop I_p to 600 kA.) 6) After obtaining a midplane MARFE, we will again ramp B_t down to 2.7 T. For this run we will puff D_2 from capillary B16-001 of the NINJA system. GPC 2 will be set up to give temperature profiles at 5.4 T, while GPC 2 will give profiles at the 2.6 T field. We were partially successful in goals 1, 2, 3, and 4. We did not do goals 5 or 6. The major results were: 1) Shot 990416019 was the best shot as regards the goals of this MP. There was full coverage of the inner wall by the Chromex. McPherson was looking at Ly_beta thru Ly_8 from the relatively stable MARFE located at Z=-0.12 m. B_t ramped from 5.4 T to 3.24 T before the plasma disrupted at 0.9 s. Very preliminary analysis shows no obvious change in the Ly_beta/D_alpha ratio, which would be the signature of a changing Ly_beta opacity. Obviouly more detailed analysis is necessary. 2) We also found that the NINJA midplane puff did not really affect the vertical position of the inner wall MARFE, whose position seems to depends on parameters presently unknown. The MARFE tended to ride well below the point of contact on the inner wall. 3) We observed an interesting effect using the D_alpha-, D_gamma- filtered TV cameras looking at the inner wall at the midplane. The plume from the NINJA capillary switches directions (toroidally) depending on whether the MARFE is above or below the capillary. A detailed shot list follows: Shots 001-005 magnet/power supply tests 006 Good shot - diverted (I_p = 800 kA) 007 Good shot - limited, MARFE somewhat below the midplane, starting at ~.15 s 008 Went to 600 kA - I_p, lost TCI at 0.226 s, disrupted (slowly) at 0.628 s No NINJA puff on that shot. 009 Good shot, 600 kA - I_p, no NINJA puff, MARFE well below the midplane 010 Good shot, 600 kA - I_p, no NINJA puff, MARFE still well below the midplane 011 fizzle 012 Good shot, 600 kA - I_p, MARFE still well below the midplane, still no NINJA 013 Good shot, 600 kA - I_p, MARFE still well below the midplane we saw the NINJA puff (start at .4, on for .5 at 470 T), but it was small emission relative to the MARFE and did not raise the position of the MARFE 014 Good shot, 600 kA - I_p, slow disruption starting at 1.0s. We programmed B_t to ramp from 5.4 to 2.7 T (ramp starting at .5 s ending at .9 s). The MARFE is now on the midplane. We saw the NINJA puff (start at .4, on for .5 at 470 T), but it was still small emission relative to the MARFE. 015 OK shot, 600 kA - I_p, slow disruption starting at 0.86s, probably caused by a CaF_2 injection. We ramped B_t down from 5.4 T The MARFE moves off of the midplane after ~0.5 s. We saw the NINJA puff (start at .4, on for .5 at 470 T). 016 Good shot, 600 kA - I_p. We ramped B_t down from 5.4 to 2.7 T. The MARFE is on the midplane but disappears after ~0.5 s. No NINJA. 017 Good shot, 600 kA - I_p, disrupted at 1.09 s. B_t ramp. The MARFE moves off the midplane to ~-0.12 m. No NINJA. 018 fizzle 019 Best shot for MARFE study. There was full coverage of the inner wall by the Chromex. McP looking at Ly_beta thru Ly_8 in the relatively stable MARFE at Z=-0.12 m. B_t ramped to 3.24 T before the plasma disrupted at 0.9 s. 020 Back to good diverted 800 kA shot. Turned the run over to Brian Labombard for burping probe studies. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:00:787PM |
| Author: To Be Determined |
| Physics operator summary for run 990416. MP 221A -- Experimental study of Zeeman effect influence on opacity MP 222 -- Impurity compression and enrichment studies SL: J. Terry, J. Goetz PO: R. Granetz The goals for today: (1) The purpose of the first half of the day (MP 221A) is to vary the opacity of the D_0 Lyman lines by changing the magnetic field strength, thereby changing the Zeeman splitting of the lines. Inboard limited plasmas will be tried first in order to get bright marfes at the midplane. (2) During the second half of the day (MP 222), the density will be varied, as will the bypass position (open vs closed). The screening, compression, and enrichment of impurities (Kr, Ar) will be measured. Summary: Although Jim Terry and Brian Labombard were able to salvage some physics from this run, it did not go very smoothly, even though the tokamak itself ran well. The two primary problems were (1) the TCI interferometer system was unreliable for most of the day, and we therefore ran with pre-programmed valve voltage only, and (2) the inner-wall marfe would not stay on the midplane, and actually was well below the midplane most of the time. These problems, plus some ICRF debugging, resulted in numerous cell accesses, costing us several hours in toto. Due to the lack of the TCI data, the second MP was not attempted. Brian Labombard got the last few shots for initial tests of ethylene (i.e. carbon) plumes. Shot 4 was a good TF-only shot at 5.7 T with 1.4 second flattop for use in calibrating the magnetics. Scorecard: 16 plasmas 5 fizzles 0 duds (0 due to power supply faults) 4 tests ---------- 25 total ------------------------------------------------------------------------------ Engineering Setup for Friday, 990416 Load from 990331029 Overnight ECDC in D2, stopping in time to begin run at 08:00. ---> *** TF under PLC control initially *** Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED fill B-side upper with 2 psi of Kr Hybrid DISABLED fill C-side with 30 psi of D2 Hybrid enabled leave J-bottom as is Hybrid DISABLED fill NINJA with 22 psi of D2 (Later in the day we may want to refill the NINJA with ethylene.) The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV ------------------------------------------------------------------------------- Run Plan for 990416 (2 half-day miniproposals): MP 221A -- Experimental study of Zeeman effect influence on opacity MP 222 -- Impurity compression and enrichment studies The purpose of the first half of the day (MP 221A) is to vary the opacity of the D_0 Lyman lines by changing the magnetic field strength, thereby changing the Zeeman splitting of the lines. Inboard limited plasmas will be tried first in order to get bright marfes at the midplane. During the second half of the day (MP 222), the density will be varied, as will the bypass position (open vs closed). The screening, compression, and enrichment of impurities (Kr, Ar) will be measured. Before the physics runs, we will need to do three test shots: 1) Usual 'Tuesday' OH test. 2) TF only test, 50 kA, 1 sec flattop (PLC control, disable fizzle detector) 3) TF only test, 150 kA, 1 sec flattop (PLC control, disable fizzle detector) After these initial tests: For 1st MP, start from plasma shot 990331023. For 2nd MP, start from plasma shot 990305023 (note the power supply settings for this long shot). ------------------------------------------------------------------------------ Note: Overnight ECDC in D2 was done prior to this run. Hybrid coldstart done; no errors found ($set default cmod$models:[hybrid.tcl] $@hybinit_dispatch $@show_bitbus_log Use editor search to verify no occurrences of "error" nor "not respond") Load 990331023. Confirm that RF feedback on RCUR is turned off (RF_LOAD_E = 0.0) Shot 01 -- OH test. All OK. Next shot: TF-only test at 50 kA, for approximately 1 s flattop. Shot 02 -- TF-only test at 50 kA, for approximately 1 s flattop. Next shot: TF-only test at 150 kA, for 1 s flattop (for magnetics calibration. Shot 03 -- TF-only test at 150 kA (for magnetics calibration). This was supposed to have a 1 s flattop, but it only lasted until t=0.2 s. Shot 04 -- TF-only test at 150 kA, this time with 1 s flattop (for magnetics calibration). Actually got 161 kA (5.7 T) for 1.4 s flattop. Next shot: plasma; load from 990331023 (0.8 MA, diverted) Shot 05 -- Fizzle. BR had +2 mT offset. Next shot: reduce BR offset by 2 mT (from 0.0045 to 0.0025 T), and reduce pre-fill puff from 20 to 18 ms. Shot 06 -- Plasma. Good shot. Ip=0.75 MA, Bt=5.4 T, nl_04=0.9e20 m-2. Next shot: 0.8 MA limiter plasma. Load from 980210035, but remove the modulation on the plasma current. Shot 07 -- Plasma. Good limited shot at 0.77 MA, 5.4 T. Marfe on inboard wall. nl_04=1.2e20 m-2. Next shot: reduce Ip to 0.6 MA. Also, increase argon puff from 20 to 30 ms. Also NINJA D2 puffing at inboard midplane from t=0.50 for duration of 0.15 s. Cell access required for diagnostics purposes between shots 7 and 8. Shot 08 -- Plasma. 0.6 MA. CO2 laser failed at 0.2 s, so we had no feedback control of density. Discharge terminated slowly, ramping down over 0.2 s, to end at t=0.8 s. NINJA puffed D2 at inboard midplane. Next shot: repeat, but with no NINJA puff. Lower NINJA plenum pressure to 10 psi (from 22 psi). Shot 09 -- Plasma. Good 0.6 MA, 5.4 T limited shot. Marfe on inboard wall, below the midplane. nl_04=1.2e20 m-2. Next shot: decrease elongation by raising ZXL by 1.5 cm and lowering ZXU by 1.3 cm. Turn on NINJA from t=0.4 to 0.9 s (with plenum pressure reduced from 22 to 10 psi). Shot 10 -- Plasma. Good 0.6 MA, 5.4 T limited shot. Marfe was still below the midplane. NINJA was mistakenly not enabled. Elongation was reduced from 1.38 to 1.34. Next shot: decrease elongation further by raising ZXL another 2 cm and lowering ZXU by 2 cm, move plasma up by 1 cm, and increase density to nl_04=1.3e20 m-2 (from 1.2), and enable the NINJA. We are trying to get the marfe to be at the midplane. Shot 11 -- Fizzle. Null looks good. Next shot: reduce BR offset by 0.0005 (from 2.5 to 2.0 mT). Shot 12 -- Plasma. Good 0.6 MA, 5.4 T limited shot. Marfe was still below the midplane. Vertical position moved up 1 cm, but elongation didn't change. Also, it turns out that the NINJA has not been firing. Next shot: repeat with no changes, except re-re-re-enable the NINJA. Long delay (2 hours) due to a cell access, mostly for the TCI laser/alignment. Shot 13 -- Plasma. Good 0.6 MA, 5.4 T limited shot. NINJA definitely puffed this time, but marfe still stayed well below the midplane. Next shot: ramp Btor down to 2.7 T, starting at t=0.5 s and ending at t=0.9 s. Shot 14 -- Plasma. Good 0.6 MA, limited shot. Bt ramped from 5.4 to 3.7 T, and then the plasma disrupted. The TCI laser failed at 0.1 s. The marfe was at the midplane on this shot. Next shot: both shots on which the density feedback failed (shots 8 and 14) had the marfe at the midplane. Therefore I have copied the valve trace from this shot and pasted it into the valve programming. Density feedback gain has been turned almost all the way off. Shot 15 -- Plasma. 0.6 MA, limited. Bt ramped down, but shot disrupted at 0.85 s. It turns out that the impurity injector fired calcium fluoride at that time. Also, the gas valve did not follow the request, because I apparently did not load the reduced density feedback. Next shot: reduce density feedback to 0.1 (from 4). Shot 16 -- Plasma. 0.6 MA, limited. Bt ramped down to 2.9 T, but midplane marfe faded away early. No density information available. Next shot: keep gas valve on at 50 volts until t=1.0 s. Shot 17 -- Plasma. 0.6 MA, limited, Bt ramp. Disrupted at 1.09 s (when Bt=3.2 T). Marfe lasted the entire shot. Thomson scattering give a central density of 2.0e20 m-3. Next shot: same, except start Bt ramp 100 ms earlier (at t=0.3 s.) Delay due to cell access for RF. Shot 18 -- Fizzle. BR is a little high. Next shot: reduce Br offset another 1 mT (from 0.002 to 0.001 T) Shot 19 -- Plasma. 0.6 MA, limited, Bt ramp, disrupted at 0.91 s. Next shot: reload shot 6 from this morning (diverted, 0.8 MA, 5.4 T) except copy in the gas voltage trace from shot 980122038 (which had a nice midplane marfe) and turn down the density feedback (since the TCI is still not working.) Shot 20 -- Plasma. Good shot. 0.75 MA, 5.4 T, diverted. Next shot: no changes. Bring scanning probe in. Shot 21 -- Plasma. Good shot. Ethylene puffed in from scanning probe at t=0.6 and 0.9 s. Next shot: no changes. Shot 22 -- Fizzle. Fields and gas look identical to shots that have gone. Next shot: try again, no changes. Shot 23 -- Fizzle. Perhaps Bz is a bit too high. Next shot: reduce IC_EF4 by 15 amps. Shot 24 -- Plasma. Good shot. 0.75 MA, 5.4 T, diverted, ethylene puffs from F-port scanning probe. 1 MW of RF at end of pulse gives brief H-mode. Next shot: take another 10 amps off of EF4 Shot 25 -- Plasma. Good shot. 0.75 MA, 5.4 T, diverted, ethylene puffs from F-port scanning probe. 1.3 MW of RF at end of pulse. End of run. |
| Session Leader Comments | |||
| Apr 16 1999 08:14:42:013AM | Jim Terry | The purpose of the first half of the 990416 run is detatiled in MP 221A. Briefly it is to vary the opacity of the D_0 Lyman lines by changing the magnetic field strength, thereby changing the Zeeman splitting of the lines, thereby possibly affecting the opacity. The plan is to 1) Make a (diverted) plasma (load shot 990331029). 2) Make a reproducible, inner wall-limited plasma with a stable midplane MARFE (we may need to induce the MARFE by a D_2 gas puff from the midplane NINJA capillary (Load shot 980210035, starting with I_p at 800 kA, but with no loop voltage modulation.) If we get this discharge at 800 kA then we will drop the plasma current to 600 kA. 3) ramp the toroidal field from 5.4 T down to 2.7 T, with the ramp starting at ~ 0.6 s, ie ~200 ms after the MARFE developes. The B_t ramp rate should be as fast as possible. q_95 will go from ~5.6 at 5.4 T to 2.8 at 2.7 T. 4) We will run this shot until we have a data set from all the spectroscopic diagnostics (VUV, Chromex, U Md spectrometer, H/D ratio, reticons). 5) If time permits, we want to make a stable midplane MARFE in a DIVERTED magnetic configuration. To do this we want to load segment 1 from shot 980122038 for the gas programming and segment 2 from 990331029. (Start at 800 kA. If OK, then drop I_p to 600 kA.) 6) After obtaining a midplane MARFE, we will again ramp B_t down to 2.7 T. For this run we will need D_2 available for the NINJA system (at 22 PSI) and ECDC in D_2. GPC 1 will be set up to give temperature profiles at 5.4 T, while GPC 2 will give profiles at the 2.6 T field. | |
| Apr 16 1999 09:47:28:217AM | 990416006 | Jim Terry | Good shot - diverted, now go to limited plasma |
| Apr 16 1999 10:14:01:373AM | 990416007 | Jim Terry | Good shot - limited, MARFE somewhat below the midplane, starting at ~.15 s |
| Apr 16 1999 05:17:59:590PM | 990416008 | Jim Terry | Went to 600 kA - I_p, lost TCI at 0.226 s, disrupted (slowly) at 0.628 s No NINJA puff on that shot. |
| Apr 16 1999 10:51:49:093AM | 990416009 | Jim Terry | Good shot, 600 kA - I_p, no NINJA puff, MARFE well below the midplane |
| Apr 16 1999 11:06:43:107AM | 990416010 | Jim Terry | Good shot, 600 kA - I_p, no NINJA puff, MARFE still well below the midplane |
| Apr 16 1999 11:24:50:483AM | 990416011 | Jim Terry | fizzle |
| Apr 16 1999 12:05:39:717PM | 990416012 | Jim Terry | ---------------------------------------------------------------------------- Good shot, 600 kA - I_p, MARFE still well below the midplane still no NINJA - |
| Apr 16 1999 01:46:54:950PM | 990416013 | Jim Terry | ---------------------------------------------------------------------------- Good shot, 600 kA - I_p, MARFE still well below the midplane we saw the NINJA puff (start at .4, on for .5 at 470 T), but it was small emission relative to the MARFE and did not raise the position of the MARFE |
| Apr 16 1999 02:07:11:420PM | 990416014 | Jim Terry | ---------------------------------------------------------------------------- Good shot, 600 kA - I_p, slow disruption starting at 1.0s. We ramped B_t from 5.4 to 2.7 T (ramp starting at .5 s ending at .9 s). The MARFE is now on the midplane. We saw the NINJA puff (start at .4, on for .5 at 470 T), but it was still small emission relative to the MARFE. |
| Apr 16 1999 03:42:07:450PM | 990416014 | Jim Terry | TV view of midplane D_alpha shows the NINJA plume switch directions (toroidally) depending on whether the MARFE is above or below the capillary. |
| Apr 16 1999 02:19:32:217PM | 990416015 | Jim Terry | ---------------------------------------------------------------------------- OK shot, 600 kA - I_p, slow disruption starting at 0.86s, probably caused by a CaF_2 injection. We ramped B_t from 5.4 to 2.7 T (ramp starting at .5 s ending at .9 s). The MARFE moves off of the midplane after ~0.5 s. We saw the NINJA puff (start at .4, on for .5 at 470 T). |
| Apr 16 1999 02:43:02:827PM | 990416016 | Jim Terry | ---------------------------------------------------------------------------- Good shot, 600 kA - I_p We ramped B_t from 5.4 to 2.7 T (ramp starting at .5 s getting to 2.9 at 1.2 s). The MARFE is on the midplane but disappears after ~0.5 s. No NINJA. |
| Apr 16 1999 03:27:11:997PM | 990416017 | Jim Terry | Good shot, 600 kA - I_p, disrupted at 1.09 s. B_t ramp. The MARFE moves off the midplane to ~-0.12 m. No NINJA. - |
| Apr 16 1999 03:25:14:857PM | 990416018 | Jim Terry | ---------------------------------------------------------------------------- fizzle |
| Apr 16 1999 04:08:22:450PM | 990416019 | Jim Terry | Best shot for MARFE study. There was full coverage of the inner wall by the Chromex. McP looking at Ly_beta thru Ly_8 in the relatively stable MARFE at Z=-0.12 m. B_t ramped to 3.24 T before the plasma disrupted at 0.9 s. |
| Apr 16 1999 04:12:31:497PM | 990416020 | Jim Terry | Back to good diverted 800 kA shot. Turned the run over to Brian Labombard for burping probe studies. |
| Physics Operator Comments | |||
| Apr 16 1999 08:05:07:467AM | Robert Granetz | Engineering Setup for Friday, 990416 Load from 990331029 Overnight ECDC in D2, stopping in time to begin run at 08:00. ---> *** TF under PLC control initially *** Gas setup - fill B-top with 6 psi of D2 Hybrid enabled fill B-side lower with 1 psi of Ar Hybrid DISABLED fill B-side upper with 2 psi of Kr Hybrid DISABLED fill C-side with 30 psi of D2 Hybrid enabled leave J-bottom as is Hybrid DISABLED fill NINJA with 22 psi of D2 (Later in the day we may want to refill the NINJA with ethylene.) The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV | |
| Apr 16 1999 08:50:30:793AM | Robert Granetz | Run Plan for 990416 (2 half-day miniproposals): MP 221A -- Experimental study of Zeeman effect influence on opacity MP 222 -- Impurity compression and enrichment studies The purpose of the first half of the day (MP 221A) is to vary the opacity of the D_0 Lyman lines by changing the magnetic field strength, thereby changing the Zeeman splitting of the lines. Inboard limited plasmas will be tried first in order to get bright marfes at the midplane. During the second half of the day (MP 222), the density will be varied, as will the bypass position (open vs closed). The screening, compression, and enrichment of impurities (Kr, Ar) will be measured. Before the physics runs, we will need to do three test shots: 1) Usual 'Tuesday' OH test. 2) TF only test, 50 kA, 1 sec flattop (PLC control, disable fizzle detector) 3) TF only test, 150 kA, 1 sec flattop (PLC control, disable fizzle detector) After these initial tests: For 1st MP, start from plasma shot 990331023. For 2nd MP, start from plasma shot 990305023 (note the power supply settings for this long shot). | |
| Apr 16 1999 08:10:09:670AM | 990416001 | Robert Granetz | Shot 01 -- OH test. All OK. Next shot: TF-only test at 50 kA, for approximately 1 s flattop. |
| Apr 16 1999 08:23:57:420AM | 990416002 | Robert Granetz | Shot 02 -- TF-only test at 50 kA, for approximately 1 s flattop. Next shot: TF-only test at 150 kA, for 1 s flattop (for magnetics calibration. |
| Apr 16 1999 09:14:23:623AM | 990416004 | Robert Granetz | Shot 04 -- TF-only test at 150 kA, this time with 1 s flattop (for magnetics calibration). Actually got 161 kA (5.7 T) for 1.4 s flattop. Next shot: plasma; load from 990331023 (0.8 MA, diverted) |
| Apr 16 1999 09:31:40:967AM | 990416005 | Robert Granetz | Shot 05 -- Fizzle. BR had +2 mT offset. Next shot: reduce BR offset by 2 mT (from 0.0045 to 0.0025 T), and reduce pre-fill puff from 20 to 18 ms. |
| Apr 16 1999 09:51:28:623AM | 990416006 | Robert Granetz | Shot 06 -- Plasma. Good shot. Ip=0.75 MA, Bt=5.4 T, nl_04=0.9e20 m-2. Next shot: 0.8 MA limiter plasma. Load from 980210035, but remove the modulation on the plasma current. |
| Apr 16 1999 10:15:10:827AM | 990416007 | Robert Granetz | Cell access required for diagnostics purposes between shots 7 and 8. |
| Apr 16 1999 10:16:27:407AM | 990416007 | Robert Granetz | Shot 07 -- Plasma. Good limited shot at 0.77 MA, 5.4 T. Marfe on inboard wall. nl_04=1.2e20 m-2. Next shot: reduce Ip to 0.6 MA. Also, increase argon puff from 20 to 30 ms. Also NINJA D2 puffing at inboard midplane from t=0.50 for duration of 0.15 s. |
| Apr 16 1999 10:35:54:640AM | 990416008 | Robert Granetz | Shot 08 -- Plasma. 0.6 MA. CO2 laser failed at 0.2 s, so we had no feedback control of density. Discharge terminated slowly, ramping down over 0.2 s, to end at t=0.8 s. NINJA puffed D2 at inboard midplane. Next shot: repeat, but with no NINJA puff. Lower NINJA plenum pressure to 10 psi (from 22 psi). |
| Apr 16 1999 10:57:14:873AM | 990416009 | Robert Granetz | Shot 09 -- Plasma. Good 0.6 MA, 5.4 T limited shot. Marfe on inboard wall, below the midplane. nl_04=1.2e20 m-2. Next shot: decrease elongation by raising ZXL by 1.5 cm and lowering ZXU by 1.3 cm. Turn on NINJA from t=0.4 to 0.9 s (with plenum pressure reduced from 22 to 10 psi). |
| Apr 16 1999 11:15:18:997AM | 990416010 | Robert Granetz | Shot 10 -- Plasma. Good 0.6 MA, 5.4 T limited shot. Marfe was still below the midplane. NINJA was mistakenly not enabled. Elongation was reduced from 1.38 to 1.34. Next shot: decrease elongation further by raising ZXL another 2 cm and lowering ZXU by 2 cm, move plasma up by 1 cm, and increase density to nl_04=1.3e20 m-2 (from 1.2), and enable the NINJA. We are trying to get the marfe to be at the midplane. |
| Apr 16 1999 11:29:15:717AM | 990416011 | Robert Granetz | Shot 11 -- Fizzle. Null looks good. Next shot: reduce BR offset by 0.0005 (from 2.5 to 2.0 mT). |
| Apr 16 1999 12:41:15:810PM | 990416012 | Robert Granetz | Shot 12 -- Plasma. Good 0.6 MA, 5.4 T limited shot. Marfe was still below the midplane. Vertical position moved up 1 cm, but elongation didn't change. Also, it turns out that the NINJA has not been firing. Next shot: repeat with no changes, except re-re-re-enable the NINJA. Long delay due to a cell access. |
| Apr 16 1999 01:51:46:763PM | 990416013 | Robert Granetz | Shot 13 -- Plasma. Good 0.6 MA, 5.4 T limited shot. NINJA definitely puffed this time, but marfe still stayed well below the midplane. Next shot: ramp Btor down to 2.7 T, starting at t=0.5 s and ending at t=0.9 s. |
| Apr 16 1999 02:12:23:577PM | 990416014 | Robert Granetz | Shot 14 -- Plasma. Good 0.6 MA, limited shot. Bt ramped from 5.4 to 3.7 T, and then the plasma disrupted. The TCI laser failed at 0.1 s. The marfe was at the midplane on this shot. Next shot: both shots on which the density feedback failed (shots 8 and 14) had the marfe at the midplane. Therefore I have copied the valve trace from this shot and pasted it into the valve programming. Density feedback gain has been turned almost all the way off. |
| Apr 16 1999 02:52:07:640PM | 990416015 | Robert Granetz | Shot 15 -- Plasma. 0.6 MA, limited. Bt ramped down, but shot disrupted at 0.85 s. It turns out that the impurity injector fired calcium fluoride at that time. Also, the gas valve did not follow the request, because I apparently not did load the reduced density feedback. Next shot: reduce density feedback to 0.1 (from 4). |
| Apr 16 1999 02:40:56:060PM | 990416016 | Robert Granetz | Shot 16 -- Plasma. 0.6 MA, limited. Bt ramped down to 2.9 T, but midplane marfe faded away early. No density information available. Next shot: keep gas valve on at 50 volts until t=1.0 s. |
| Apr 16 1999 03:10:11:310PM | 990416017 | Robert Granetz | Shot 17 -- Plasma. 0.6 MA, limited, Bt ramp. Disrupted at 1.09 s (when Bt=3.2 T). Marfe lasted the entire shot. Next shot: same, except start Bt ramp 100 ms earlier (at t=0.3 s.) Delay due to cell access for RF. |
| Apr 16 1999 03:22:25:653PM | 990416018 | Robert Granetz | Shot 18 -- Fizzle. BR is a little high. Next shot: reduce Br offset another 1 mT (from 0.002 to 0.001 T) |
| Apr 16 1999 03:48:56:077PM | 990416019 | Robert Granetz | Shot 19 -- Plasma. 0.6 MA, limited, Bt ramp, disrupted at 0.91 s. Next shot: reload shot 6 from this morning (diverted, 0.8 MA, 5.4 T) except copy in the gas voltage trace from shot 980122038 (which had a nice midplane marfe) and turn down the density feedback (since the TCI is still not working.) |
| Apr 16 1999 03:58:13:780PM | 990416020 | Robert Granetz | Shot 20 -- Plasma. Good shot. 0.75 MA, 5.4 T, diverted. Next shot: no changes. Bring scanning probe in. |
| Apr 16 1999 04:11:51:030PM | 990416021 | Robert Granetz | Shot 21 -- Plasma. Good shot. Ethylene puffed in from scanning probe at t=0.6 and 0.9 s. Next shot: no changes. |
| Apr 16 1999 04:29:36:013PM | 990416022 | Robert Granetz | Shot 22 -- Fizzle. Fields and gas look identical to shots that have gone. Next shot: try again, no changes. |
| Apr 16 1999 04:42:37:280PM | 990416023 | Robert Granetz | Shot 23 -- Fizzle. Perhaps Bz is a bit too high. Next shot: reduce IC_EF4 by 15 amps. |
| Apr 16 1999 05:01:22:763PM | 990416024 | Robert Granetz | Shot 24 -- Plasma. Good shot. 0.8 MA, 5.4 T, diverted, ethylene puffs from F-port scanning probe. 1 MW of RF at end of pulse gives brief H-mode. Next shot: take another 10 amps off of EF4 |
| Apr 16 1999 05:14:04:327PM | 990416025 | Robert Granetz | Shot 25 -- Plasma. Good shot. 0.75 MA, 5.4 T, diverted, ethylene puffs from F-port scanning probe. 1.3 MW of RF at end of pulse. End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:02:02:610AM | Test | Ok | OH test OK |
| 2 | 08:21:29:263AM | Test | Ok | 50KA TF test OK |
| 3 | 08:49:29:247AM | Test | Ok | TF test shot only |
| 4 | 09:03:27:530AM | Test | Ok | TF test only |
| 5 | 09:18:50:060AM | Plasma | Ok | no faults/Fizzel |
| 6 | 09:40:21:890AM | Plasma | Ok | no faults/plasma |
| 7 | 09:57:15:997AM | Plasma | Ok | no faults/plasma |
| 8 | 10:20:03:733AM | Plasma | Ok | no faults/plasma |
| 9 | 10:42:51:247AM | Plasma | Ok | no faults/plasma |
| 10 | 11:01:00:310AM | Plasma | Ok | no faults/plasma |
| 11 | 11:20:47:090AM | Plasma | Ok | no faults/fizzel |
| 12 | 11:37:36:890AM | Plasma | Ok | no faults/plasma |
| 13 | 01:40:07:780PM | Plasma | Ok | No Faults |
| 14 | 01:54:45:623PM | Plasma | Ok | No Faults |
| 15 | 02:12:26:013PM | Plasma | Ok | No Faults |
| 16 | 02:30:15:700PM | Plasma | Ok | No Faults |
| 17 | 02:49:08:483PM | Plasma | Ok | No faults |
| 18 | 03:15:41:747PM | Plasma | Ok | (null) |
| 19 | 03:29:01:500PM | Plasma | Ok | No faults |
| 20 | 03:47:49:920PM | Plasma | Ok | No Faults |
| 21 | 04:04:39:450PM | Plasma | Ok | No Faults |
| 22 | 04:21:27:297PM | Plasma | Ok | No Faults |
| 23 | 04:35:17:280PM | Plasma | Ok | No Faults |
| 24 | 04:49:05:043PM | Plasma | Ok | No Faults |
| 25 | 05:04:37:013PM | Test | Bad | |