| Miniproposals | ||||||||||||
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| Operators | |
| Session leader(s): | Bruce Lipschultz,John Goetz |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Vinny Bertolino |
| Engineering Operator Run Comment |
| mp 177 |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:17:880PM |
| Author: To Be Determined |
| Run 980121 session leader: John Goetz/Bruce Lipschultz physop: RSG engineering op: V. Bertolino Mini-proposal 177: "Exploration of the Effect of the Prototype Cryopump on Impurity Transport' The purpose of this MP was to explore whether the impurity transport characteristics are affected by the protoype cryopump. Ohmic plasmas with density ramps to divertor detachment and EDA H-mode plasmas were investigated. Argon or neon gas was puffed into these types of plasmas with the cryopump on or off. The core impurity ion densities were monitored with x-ray and VUV spectrometers and the divertor impurity neutral densities with an RGA. In Ohmic plasmas, the core argon and the edge neon were "pumping out", i.e., the time history of the signal was decaying away. Comparing the core argon density with and without the cryopump operational indicates that the pump had no effect on the decay rate. This indicates that something else is doing the pumping. This is more than likely the walls. Neon line brightnesses from charge states in the edge plasma (temperature < 150eV) do show a decrease in the equilibrium value with the cryopump operational. However, the initial "pumpout" is nearly identical with and without the cryopump, also indicating a strong wall sink. The density in these Ohmic plasmas was ramped to divertor detachment. After divertor detachment, the cryopump is observed to make a difference in core argon density. The penetration factor for puffed argon entering the core is lower after detachment with the cryopump on than it is after detachment with the cryopump off. This can be seen by comparing shots 007 and 021 after 0.75sec. Shot 021 (pump off) shows an increase in the core argon density while 007 (pump on) does not. Measurements of the neutral particle density in the divertor indicate that the density is lower by approximately 20% with the pump operational. In EDA H-modes, the "pump out" effect is still evident on the core argon density and there is no difference between plasmas with and without the cryopump operational. Core neon brightness measurements show no "pump out" behavior, although the SNR is small (because the neon was puffed early and not directly into the EDA H-mode, e.g. 980109027). There is also no discernible difference in the core neon behavior with and without the cryopump. However, there is a slight decrease, <20%, in both the divertor neutral neon and argon with the cryopump operational. These results are in contrast to those obtained with the non-recycling impurity gas nitrogen on 970617. During that run, the edge nitrogen brightness was reduced by a factor of two with the cryopump operational. Further analysis of these data continues. The following is a list of the pumping speeds determined by Jim Irby from pumpout rates from t=4 to t=8 seconds: 980121001 F Side Ratio Pumping Speed: 1485 l/s 980121001 B-bot MKS Pumping Speed: 1500 l/s 980121002 F Side Ratio Pumping Speed: 1791 l/s 980121002 B-bot MKS Pumping Speed: 2513 l/s 980121003 B-bot MKS Pumping Speed: 1205 l/s 980121004 F Side Ratio Pumping Speed: 1760 l/s 980121004 B-bot MKS Pumping Speed: 1264 l/s 980121005 B-bot MKS Pumping Speed: 1365 l/s 980121006 B-bot MKS Pumping Speed: 1135 l/s 980121007 B-bot MKS Pumping Speed: 1199 l/s 980121008 B-bot MKS Pumping Speed: 1223 l/s 980121009 F Side Ratio Pumping Speed: 1382 l/s 980121009 B-bot MKS Pumping Speed: 1744 l/s 980121010 B-bot MKS Pumping Speed: 1453 l/s 980121011 F Side Ratio Pumping Speed: 1790 l/s 980121011 B-bot MKS Pumping Speed: 2279 l/s 980121012 F Side Ratio Pumping Speed: 1387 l/s 980121012 B-bot MKS Pumping Speed: 1348 l/s 980121013 F Side Ratio Pumping Speed: 1320 l/s 980121013 B-bot MKS Pumping Speed: 1351 l/s 980121014 F Side Ratio Pumping Speed: 1005 l/s pump warming up 980121014 B-bot MKS Pumping Speed: 1025 l/s 980121015 F Side Ratio Pumping Speed: -18 l/s test shot/no puff 980121015 B-bot MKS Pumping Speed: **** l/s 980121016 F Side Ratio Pumping Speed: 253 l/s 980121016 B-bot MKS Pumping Speed: 208 l/s 980121017 B-bot MKS Pumping Speed: 152 l/s 980121018 B-bot MKS Pumping Speed: 306 l/s 980121019 B-bot MKS Pumping Speed: 298 l/s 980121020 B-bot MKS Pumping Speed: 199 l/s 980121021 B-bot MKS Pumping Speed: 200 l/s 980121022 B-bot MKS Pumping Speed: 240 l/s The shot specifics follow: Shot #1: Cryopump on. No impurity puff. nl04=1.7e20 reached. The plasma is ohmic only and attached. Got background mesaurements with RGA for masses 4, 22 and 40. shot #2: fizzle shot #3: 60 ms Ne (4. PSI) from J-bottom, 35 ms Ar (1.95 PSI) from B-side lower. no VUV data. No detachment. Ar pumping out.. shot #4: fizzle shot #5: disrupt shot #6: 800 kA. nl04=1.7e20. Detached at .75 -.8 seconds. Just the Ne puff. No Ar. shot fine. shot #7: Ar on. Ne off. Still detaching at the same time. shot #8: disruption at .44 sec. Huge Mo injection at .29 + both Ne and Ar injected at 0.3. shot #9: Ar on. RF on at 2. MW. EDA mode. Ar levels in the core go way up for the same amount puffed. Divertor levels stay constant. shot #10: RF on. No gas puffed - baseline. Disrupted at 0.8 seconds due to probe injection. shot #11: Fizzle shot #12: Ne and RF on. EDA mode but after the second Ne puff (.65 seconds) the H-alpha rises quite a bit? Not a MARFE. No Ne data from McPherson. shot #13: Less Ne in the second puff. VUV still not enough signal. More constant EDA than 13. shot #14: Same shot shot #15: pass due to coming out of init shot #16: cryopump off. Ne puff at 40 ms. shot #17: disruption - too much Ne at 100 ms. shot #18: Ar puffed. EDA mode. Level of Ar in the divertor and plasma not very different from pumped case in initial level at least. shot #19: Ne puffed for Jim to look at Li-like Ne. shot #20: Back to ohmic. Ne puff (40 ms). Ne levels similar to ohmic shot earlier with pump. shot #21: Ar with ohmic shot. shot #22: RF back on and EDA mode. Ne puff for Li-like Ne measurement. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:58:863PM |
| Author: To Be Determined |
| Physics operator summary for run 980121. MP 177 -- Cryopump and Impurities SL: Lipschultz/Goetz PO: Granetz Summary: Despite losing several hours to cooling problems with the cryopump, and to a VIP tour, we still managed to fill in a matrix of two impurity gases (neon and argon), cryopump on and off, and RF on and off. The plasma breakdown was back to normal (i.e. same as last week), and machine reliability was also very good. Not accomplished today: He-3 and krypton. See the session leader's report for the science we learned today about the cryopump. Physop things learned today: Was 2 hours of ECDC in D2 (after the recent boronization) responsible for getting the machine back into its normal groove? Also learned today: it ain't loaded 'til it's loaded (into the PCS model, that is). Scorecard: 18 plasmas 3 fizzles 0 duds 1 tests/dummy shot cycles ---------- 22 total ------------------------------------------------------------------------------ Engineering Setup and Run Plan for 980121 (written by John Goetz) MP #177 Cryopump and Impurities Engineering setup: ECDC in D2 for a few hours in the morning begin as on 980116025, a slow density ramp to detachment TF under hybrid control Gas setup - fill K-side with 30 PSI of D2, hybrid enabled fill B-top with 6 PSI of D2, hybrid enabled fill B-side-lower with 2 PSI of Ar, hybrid enabled fill J-bottom with 4 PSI of Ne hybrid enabled ECE gate valve enabled; others if diagnosticians are ready. Physics to be done: Investigate impurity transport in discharges with cryopumping. Setup discharges with divertor detachment and EDA H-modes with the cryopump cold and puff in neon, argon, krypton, and helium-3 (depending on number of shots of course). Measure impurity screening, compression, and enrichment. Toss in enough baselines to ensure that it can be determined that the cryopump is 'doing something' Repeat the measurements with the pump off. Begin with the cryopump cold and try to reproduce 980116025, which is a plasma with a slow density ramp to divertor detachment. Begin by puffing neon and argon at 0.3sec. [move on to the other gases and baselines] Use 980116025 and add 2MW of RF from 0.5 to 1.2sec to get EDA H-modes and repeat. Guesses for the various gases to be used: 40msec of 4PSI Ne thru J-Bottom 35msec of 2PSI Ar thru B-Side-Lower 20msec of 4PSI Kr thru B-Side-Lower 60msec of 4PSI He-3 thru B-Side-Upper ------------------------------------------------------------------------------- Detailed shot log: Note: 2 hours of ECDC in deuterium was done prior to today's 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") Reload plasma shot 980116025 (1 MA, 5.7 T, high density ramp) RF not needed for first part of run (could be on late in the shot) RF feedback on RCUR is turned off (RF_LOAD_E = 0.0) Cryopump will be cold for the beginning of the run. No impurity puffing for first shot. Shot 01 -- Plasma. Good shot. Cryopump was cold. No impurity puffing. Density ramps up to nl04=1.7e20 m-2 at t=1.00 s, and then ramps down noticeably, allowing the shot to go full length without disrupting during rampdown. This is undoubtedly due to the cryopump. (We wanted nl04 to reach 2e20 m-2 at t=1 s.) Next shot: turn on argon puff (35 ms) and neon puff (60 ms) at t=0.3 s. Turn STRKPSI feedback on earlier (0.4 s instead of 0.6 s). Program higher density demand around 0.5 s, and open up the B-top valve (6 psi D2) with 100 volts of pre-programmed voltage from t=0.5 to 1.0 s. Shot 02 -- Fizzle. Looks like Br needs a tweak. Next shot: reduce Br from .0055 to .005 T Shot 03 -- Plasma. Good shot. Density gets to nl04=1.85e20 m-2. Almost didn't go. Vertical instability terminates shot a little earlier than the previous one. Argon and neon are being puffed. Next shot: increase density demand. Soften the turnoff of STRKPSI control at 1.25 s (the sudden turnoff may be giving rise to the vertical instability). Shot 04 -- Fizzle. Next shot: reduce Br a little more (.005 to .0045) Shot 05 -- Plasma. Disrupted at 0.48 s. Next shot: reduce Ip to 0.8 MA, reduce density demand to nl04=1.7e20 m-2 at t=1.0 s. Turn off argon, but leave neon on. Shot 06 -- Plasma. Good shot. Ip=0.8 MA. nl04=1.7e20 m-2 at 1.0 s, as requested. Neon was on, argon was off. Next shot: turn off neon and turn on argon. Purge neon (because JT is seeing nitrogen with the neon). Also tweak STRKPSI to try and satisfy Brian. Shot 07 -- Plasma. Good shot. Argon was on, neon off. Some hard x-rays early in the shot. Next shot: tweak early gas puffing. More tweaks to STRKPSI, since Brian's target didn't improve. Turn on both argon and neon. Add a second (20 ms) puff to both gases at t=0.65 s. Reduce initial neon puff from 60 to 40 ms. Shot 08 -- Plasma. Disrupted at 0.45 s. It looks like we can't have both the neon and argon on at the same time! There was also a large (moly?) injection at 0.3 s, which may also be to blame. Next shot: Turn off neon, leave argon on (with two puffs). Extend density flattop to 1.2 s. Shot 09 -- Plasma. Good shot. 2 MW of ICRF was mistakenly turned on from t=0.5 to 1.0+ s. EDA H-mode. Next shot: no argon nor neon. Use STRKPSI control only after t=0.75 s, and use ZXL up to 0.745 s. Turn on 2 MW of RF (on purpose this time). Shot 10 -- Plasma. Disrupted at 0.81 s, probably caused by Brian's probe going in too far. Next shot: turn on neon, leave argon off. There's a break for JT to get cell access to fix a problem with the McPherson. Shot 11 -- Fizzle. Null is okay. Chalk it up to disruption recovery. Next shot: no changes Shot 12 -- Plasma. Good shot. Prf=2 MW from t=0.5 to 1.2 s, no faults. ELM-free followed by EDA H-mode. Edge xrays clearly see the 2nd neon puff at 0.65 s. Next shot: Change ZXL programming from 0.5 to 0.75 s for Brian. Turn off B-top (D2) valve programming in segment 2. Reduce 2nd neon puff from 20 to 12 ms. Shot 13 -- Plasma. Good shot. Similar to previous shot. Early probe targeting is still not satisfactory...give it up for now. Next shot: increase first neon puff from 40 to 100 ms, and remove 2nd neon puff. Change argon to krypton in B-side-lower, but leave disabled. Shorten He-3 puff (B-side-upper) from 60 to 20 ms, at a pressure of 16 psi, but leave disabled. Shot 14 -- Plasma. Good shot. Oops...operator error. I forgot to load the lengthened neon waveform. We'll have to repeat this shot. Next shot: repeat with no changes. There's a break here to allow cell access. The cryopump ran out of LN2. A new dewar will be connected up. We'll have to have a dummy shot cycle, since we had to back out of shot 15 because of the cryopump. Shot 15 -- Dummy shot cycle to re-align the planets and the machine's karma. There was a very long break here to work on the cryopump. After several hours, it was determined that it could not be cooled down. Therefore, we will continue with the non-cryo comparison shots. Next shot: swap out the krypton and replace it with argon. Do not enable the argon. Turn on neon at 0.3 s, with a pulse duration of 40 ms. Shot 16 -- Plasma. Good shot. Neon puffed. Prf=2 MW. This shot looks very similar to shot 14, but without the cryopumping. JT does not get a strong enough neon signal. Very noticeable on edge xrays though. Next shot: increase neon puff duration to 100 ms (from 40 ms). Shot 17 -- Plasma. Disrupted at 0.43 s, quite obviously due to too much neon. Next shot: turn off neon, turn on argon (35 ms @ 0.3 s, no 2nd puff) Shot 18 -- Plasma. Good shot. Argon puffed. Prf=2 MW. Next shot: turn off argon. Turn on neon (40 ms @ 0.3 s). JT will look at a different (and hopefully stronger) neon line. Shot 19 -- Plasma. Good shot. Neon puffed. Prf=2 MW. Next shot: same, except no RF. To help get the desired density in the ohmic plasma, turn back on the B-top valve from 0.5 to 1.0 s. Keep the neon on. Shot 20 -- Plasma. Good shot. Neon puffed. Ohmic. nl04=1.74e20 m-2. Next shot: turn off neon, turn on argon (35 ms @ 0.3 s). No RF. Shot 21 -- Plasma. Good shot. Argon puffed. Ohmic. Next shot: turn off argon, turn on neon (40 ms @ 0.3 s). Turn RF back on. Shot 22 -- Plasma. Good shot. Neon puffed. Prf=2 MW. End of run. |
| Session Leader Comments | |||
| Jan 21 1998 09:49:41:520AM | 980121001 | Bruce Lipschultz | Shot #1: Cryopump on. No impurity puff. nl04=1.7e20 reached. The plasma is ohmic only and attached. Got background mesaurements with RGA for masses 4, 22 and 40. |
| Jan 21 1998 10:26:48:910AM | 980121003 | Bruce Lipschultz | shot #3: 60 ms Ne (4. PSI) from J-bottom, 35 ms Ar (1.95 PSI) from B-side lower. no VUV data. No detachment. |
| Jan 21 1998 11:37:55:610AM | 980121003 | Bruce Lipschultz | shot #3: 60 ms Ne (4. PSI) from J-bottom, 35 ms Ar (1.95 PSI) from B-side lower. no VUV data. No detachment. Ar pumping out.. |
| Jan 21 1998 11:38:14:550AM | 980121006 | Bruce Lipschultz | shot #6: 800 kA. nl04=1.7e20. Detached at .75 -.8 seconds. Just the Ne puff. No Ar. shot fine. |
| Jan 21 1998 11:38:33:960AM | 980121007 | Bruce Lipschultz | shot #7: Ar on. Ne off. Still detaching at the same time. |
| Jan 21 1998 11:57:41:230AM | 980121009 | Bruce Lipschultz | shot #9: Ar on. RF on at 2. MW. EDA mode. Ar levels in the core go way up for the same amount puffed. Divertor levels stay constant. |
| Jan 21 1998 12:26:45:150PM | 980121010 | Bruce Lipschultz | shot #10: RF on. No gas puffed - baseline. Disrupted at 0.8 seconds due to probe injection. |
| Jan 21 1998 12:53:16:950PM | 980121012 | Bruce Lipschultz | shot #12: Ne and RF on. EDA mode but after the second Ne puff (.65 seconds) the H-alpha rises quite a bit? Not a MARFE. No Ne data from McPherson. |
| Jan 21 1998 01:12:57:210PM | 980121013 | Bruce Lipschultz | shot #13: Less Ne in the second puff. VUV still not enough signal. More constant EDA than 13. |
| Jan 21 1998 03:44:26:590PM | 980121014 | Bruce Lipschultz | shot 14: same as 13. |
| Jan 21 1998 03:45:54:040PM | 980121016 | Bruce Lipschultz | shot #16: cryopump off. Ne puff at 40 ms. |
| Jan 21 1998 03:53:27:400PM | 980121017 | Bruce Lipschultz | shot #17: disruption - too much Ne at 100 ms. |
| Jan 21 1998 04:14:52:520PM | 980121018 | Bruce Lipschultz | shot #18: Ar puffed. EDA mode. Level of Ar in the divertor and plasma not very different from pumped case in initial level at least. |
| Jan 21 1998 04:29:43:970PM | 980121019 | Bruce Lipschultz | shot #19: Ne puffed for Jim to look at Li-like Ne. |
| Jan 21 1998 04:42:30:200PM | 980121020 | Bruce Lipschultz | shot #20: Back to ohmic. Ne puff (40 ms). Ne levels similar to ohmic shot earlier with pump. |
| Jan 21 1998 04:55:32:030PM | 980121021 | Bruce Lipschultz | shot #21: Ar with ohmic shot. |
| Jan 21 1998 05:10:53:630PM | 980121022 | Bruce Lipschultz | shot #22: RF back on and EDA mode. Ne puff for Li-like Ne measurement. |
| Physics Operator Comments | |||
| Jan 21 1998 07:53:45:510AM | Robert Granetz | Engineering Setup and Run Plan for 980121 (written by John Goetz) MP #177 Cryopump and Impurities Engineering setup: ECDC in D2 for a few hours in the morning begin as on 980116025, a slow density ramp to detachment TF under hybrid control Gas setup - fill K-side with 30 PSI of D2, hybrid enabled fill B-top with 6 PSI of D2, hybrid enabled fill B-side-lower with 2 PSI of Ar, hybrid enabled fill J-bottom with 4 PSI of Ne hybrid enabled ECE gate valve enabled; others if diagnosticians are ready. | |
| Jan 21 1998 07:54:58:830AM | Robert Granetz | (con't : ) Engineering Setup and Run Plan for 980121 (written by John Goetz) MP #177 Cryopump and Impurities Physics to be done: Investigate impurity transport in discharges with cryopumping. Setup discharges with divertor detachment and EDA H-modes with the cryopump cold and puff in neon, argon, krypton, and helium-3 (depending on number of shots of course). Measure impurity screening, compression, and enrichment. Toss in enough baselines to ensure that it can be determined that the cryopump is 'doing something' Repeat the measurements with the pump off. Begin with the cryopump cold and try to reproduce 980116025, which is a plasma with a slow density ramp to divertor detachment. Begin by puffing neon and argon at 0.3sec. [move on to the other gases and baselines] Use 980116025 and add 2MW of RF from 0.5 to 1.2sec to get EDA H-modes and repeat. Guesses for the various gases to be used: 40msec of 4PSI Ne thru J-Bottom 35msec of 2PSI Ar thru B-Side-Lower 20msec of 4PSI Kr thru B-Side-Lower 60msec of 4PSI He-3 thru B-Side-Upper | |
| Jan 21 1998 08:40:12:650AM | Robert Granetz | Note: 2 hours of ECDC in deuterium was done prior to today's 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") Reload plasma shot 980116025 (1 MA, 5.7 T, high density ramp) RF not needed for first part of run (could be on late in the shot) RF feedback on RCUR is turned off (RF_LOAD_E = 0.0) Cryopump will be cold for the beginning of the run. No impurity puffing for first shot. | |
| Jan 21 1998 09:40:13:070AM | 980121001 | Robert Granetz | Shot 01 -- Plasma. Good shot. Cryopump was cold. No impurity puffing. Density ramps up to nl04=1.7e20 m-2 at t=1.00 s, and then ramps down noticeably, allowing the shot to go full length without disrupting during rampdown. This is undoubtedly due to the cryopump. (We wanted nl04 to reach 2e20 m-2 at t=1 s.) Next shot: turn on argon puff (35 ms) and neon puff (60 ms) at t=0.3 s. Turn STRKPSI feedback on earlier (0.4 s instead of 0.6 s). Program higher density demand around 0.5 s, and open up the B-top valve (6 psi D2) with 100 volts of pre-programmed voltage from t=0.5 to 1.0 s. |
| Jan 21 1998 10:11:14:500AM | 980121002 | Robert Granetz | Shot 02 -- Fizzle. Looks like Br needs a tweak. Next shot: reduce Br from .0055 to .005 T |
| Jan 21 1998 10:29:18:790AM | 980121003 | Robert Granetz | Shot 03 -- Plasma. Good shot. Density gets to nl04=1.85e20 m-2. Almost didn't go. Vertical instability terminates shot a little earlier than the previous one. Argon and neon are being puffed. Next shot: increase density demand. Soften the turnoff of STRKPSI control at 1.25 s (the sudden turnoff may be giving rise to the vertical instability). |
| Jan 21 1998 11:10:42:570AM | 980121004 | Robert Granetz | Shot 04 -- Fizzle. Next shot: reduce Br a little more (.005 to .0045) |
| Jan 21 1998 10:51:50:900AM | 980121005 | Robert Granetz | Shot 05 -- Plasma. Disrupted at 0.48 s. Next shot: reduce Ip to 0.8 MA, reduce density demand to nl04=1.7e20 m-2 at t=1.0 s. Turn off argon, but leave neon on. |
| Jan 21 1998 11:10:08:400AM | 980121006 | Robert Granetz | Shot 06 -- Plasma. Good shot. Ip=0.8 MA. nl04=1.7e20 m-2 at 1.0 s, as requested. Neon was on, argon was off. Next shot: turn off neon and turn on argon. Purge neon (because JT is seeing nitrogen with the neon). Also tweak STRKPSI to try and satisfy Brian. |
| Jan 21 1998 11:25:12:000AM | 980121007 | Robert Granetz | Shot 07 -- Plasma. Good shot. Argon was on, neon off. Some hard x-rays early in the shot. Next shot: tweak early gas puffing. More tweaks to STRKPSI, since Brian's target didn't improve. Turn on both argon and neon. Add a second (20 ms) puff to both gases at t=0.65 s. Reduce initial neon puff from 60 to 40 ms. |
| Jan 21 1998 11:37:38:590AM | 980121008 | Robert Granetz | Shot 08 -- Plasma. Disrupted at 0.45 s. It looks like we can't have both the neon and argon on at the same! There was also a large (moly?) injection at 0.3 s, which may also be to blame. Next shot: Turn off neon, leave argon on (with two puffs). Extend density flattop to 1.2 s. |
| Jan 21 1998 11:55:09:370AM | 980121009 | Robert Granetz | Shot 09 -- Plasma. Good shot. 2 MW of ICRF was mistakenly turned on from t=0.5 to 1.0+ s. EDA H-mode. Next shot: no argon nor neon. Use STRKPSI control only after t=0.75 s, and use ZXL up to 0.745 s. Turn on 2 MW of RF (on purpose this time). |
| Jan 21 1998 12:21:40:220PM | 980121010 | Robert Granetz | Shot 10 -- Plasma. Disrupted at 0.81 s, probably caused by Brian's probe going in too far. Next shot: turn on neon, leave argon off. There's a break for JT to get cell access to fix a problem with the McPherson. |
| Jan 21 1998 12:33:25:260PM | 980121011 | Robert Granetz | Shot 11 -- Fizzle. Null is okay. Chalk it up to disruption recovery. Next shot: no changes |
| Jan 21 1998 12:49:31:970PM | 980121012 | Robert Granetz | Shot 12 -- Plasma. Good shot. Prf=2 MW from t=0.5 to 1.2 s, no faults. ELM-free followed by EDA H-mode. Edge xrays clearly see the 2nd neon puff at 0.65 s. Next shot: Change ZXL programming from 0.5 to 0.75 s for Brian. Turn off B-top (D2) valve programming in segment 2. Reduce 2nd neon puff from 20 to 12 ms. |
| Jan 21 1998 01:15:06:960PM | 980121013 | Robert Granetz | Shot 13 -- Plasma. Good shot. Similar to previous shot. Early probe targeting is still not satisfactory...give it up for now. Next shot: increase first neon puff from 40 to 100 ms, and remove 2nd neon puff. Change argon to krypton in B-side-lower, but leave disabled. Shorten He-3 puff (B-side-upper) from 60 to 20 ms, at a pressure of 16 psi, but leave disabled. |
| Jan 21 1998 01:38:03:760PM | 980121014 | Robert Granetz | Shot 14 -- Plasma. Good shot. Oops...operator error. I forgot to load the lengthened neon waveform. We'll have to repeat this shot. Next shot: repeat with no changes. |
| Jan 21 1998 01:39:28:990PM | 980121015 | Robert Granetz | There's a break here to allow cell access. The cryopump ran out of LN2. A new dewar will be connected up. We'll have to have a dummy shot cycle, since we had to back out of shot 15 because of the cryopump. Shot 15 -- Dummy shot cycle to re-align the planets and the machine's karma. |
| Jan 21 1998 03:24:29:480PM | 980121015 | Robert Granetz | There was a very long break here to work on the cryopump. After several hours, it was determined that it could not be cooled down. Therefore, we will continue with the non-cryo comparison shots. Next shot: swap out the krypton and replace it with argon. Do not enable the argon. Turn on neon at 0.3 s, with a pulse duration of 40 ms. |
| Jan 21 1998 03:45:00:500PM | 980121016 | Robert Granetz | Shot 16 -- Plasma. Good shot. Neon puffed. Prf=2 MW. This shot looks very similar to shot 14, but without the cryopumping. JT does not get a strong enough neon signal. Very noticeable on edge xrays though. Next shot: increase neon puff duration to 100 ms (from 40 ms). |
| Jan 21 1998 03:55:14:510PM | 980121017 | Robert Granetz | Shot 17 -- Plasma. Disrupted at 0.43 s, quite obviously due to too much neon. Next shot: turn off neon, turn on argon (35 ms @ 0.3 s, no 2nd puff) |
| Jan 21 1998 04:07:10:460PM | 980121018 | Robert Granetz | Shot 18 -- Plasma. Good shot. Argon puffed. Prf=2 MW. Next shot: turn off argon. Turn on neon (40 ms @ 0.3 s). JT will look at a different (and hopefully stronger) neon line. |
| Jan 21 1998 04:22:02:400PM | 980121019 | Robert Granetz | Shot 19 -- Plasma. Good shot. Neon puffed. Prf=2 MW. Next shot: same, except no RF. To help get the desired density in the ohmic plasma, turn back on the B-top valve from 0.5 to 1.0 s. Keep the neon on. |
| Jan 21 1998 04:34:31:250PM | 980121020 | Robert Granetz | Shot 20 -- Plasma. Good shot. Neon puffed. Ohmic. nl04=1.74e20 m-2. Next shot: turn off neon, turn on argon (35 ms @ 0.3 s). No RF. |
| Jan 21 1998 04:57:02:970PM | 980121021 | Robert Granetz | Shot 21 -- Plasma. Good shot. Argon puffed. Ohmic. Next shot: turn off argon, turn on neon (40 ms @ 0.3 s). Turn RF back on. |
| Jan 21 1998 04:59:39:080PM | 980121022 | Robert Granetz | Shot 22 -- Plasma. Good shot. Neon puffed. Prf=2 MW. End of run. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:59:30:500AM | Plasma | Ok | |
| 2 | 10:05:04:990AM | Plasma | Ok | |
| 3 | 10:13:26:780AM | Plasma | Ok | |
| 4 | 10:30:27:300AM | Plasma | Ok | |
| 5 | 10:40:43:730AM | Plasma | Ok | |
| 6 | 10:53:08:810AM | Plasma | Ok | |
| 7 | 11:11:12:830AM | Plasma | Ok | |
| 8 | 11:26:51:060AM | Plasma | Ok | |
| 9 | 11:41:52:400AM | Plasma | Ok | |
| 10 | 11:57:37:160AM | Plasma | Ok | |
| 11 | 12:26:08:150PM | Plasma | Ok | |
| 12 | 12:35:32:750PM | Plasma | Ok | |
| 13 | 12:53:23:280PM | Plasma | Ok | |
| 14 | 01:17:02:380PM | Test | Ok | |
| 15 | 01:30:11:380PM | Test | Ok | no power test shot |
| 16 | 03:34:45:100PM | Test | Ok | |
| 17 | 03:48:36:310PM | Test | Ok | |
| 18 | 04:00:35:970PM | Plasma | Ok | |
| 19 | 04:15:12:760PM | Plasma | Ok | |
| 20 | 04:28:45:300PM | Plasma | Ok | |
| 21 | 04:41:40:020PM | Plasma | Ok | |
| 22 | 04:54:55:890PM | Plasma | Ok | |