| Miniproposals | ||||||||||||||
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| Operators | |
| Session leader(s): | Jim Terry,Steve Scott,Howard Yuh,Bill Rowan |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Bill Byford,Bill Cochran |
| Engineering Operator Run Comment |
| MP 319 (con't) -- SOL turbulance SL:J. Terry/S. Zweben EO:Cochran,Byford |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:02:227PM |
| Author: Steve Scott |
| Session Leader Summary for 1040115-B MP 322. MSE Calibration II (not completed) Physics Operator: Granetz Session Leader: Yuh, Scott, Rowan Experiment: Beam into gas for MSE calibration Shots 1040115028 through 1030115032 of this run were beam into gas shots. These were TF only (5.4 T) with D2 fill at 1.7-1.8 mTorr. The purpose was to test a new method for observing MSE spectra with a spectrometer. Previous attempts to make these spectral measurements have been unsuccessful or the results limited in utility because of problems in coupling the MSE fiber optics into the spectrometer. These problems were overcome with an improved alignment jig and alignment procedure. Useful data was acquired. H-alpha spectral components of interest were identified. In particular, the Pi components used in the MSE observations were observed. Polarization measurements confirmed the identification of components within the spectrum. |
| Entered: Jul 7 2004 03:49:02:243PM |
| Author: Jim Terry |
| This run was a continuation of MP 319 studying SOL turbulence Session leader: J. Terry Physics operator: R. Granetz Short Run Summary: We accomplished most of what we set out to do. The key results are: 1) We observed that near the density limit (i.e. n/n_Greenwald > 0.7), blobs were generated INSIDE the separatrix. At the same time the edge gradient, which is typically peaked at or near the separatrix, was inside the separatrix as well. Thus we demonstrated that the blobs are generated in the gradient region, not necessarily at the separatrix. See shots 007, 015, 008, 011, 009, 012, 013, which had turbulence movie data at n/n_Greenwald = 0.27, 0.32, 0.65, 0.74, 0.75, 0.80, and 0.81 respectively. 2) We observed that there is a difference in the poloidal propagation characteristics between LSN discharges and otherwise identical USN discharges. The LSN discharges have blobs propagating primarily in the downward direction (at the outside midplane), while the USN discharges had more of a a mixture of downward and upward poloidal propagation. See shots 016 and 023 for LSN, 017 and 022 for USN. 3) We ran He plasmas and looked at the edge turbulence. Although blobs were seen in He plasmas, there appeared to be some differences in the blob characteristics compared to D2 plasmas. This observations will await further quantitative analysis. See shots 027 and 024. The Run Plan was as follows: Necessary diagnostics: ASP and ISP 300 frame PSI camera (filtered for HeI-587nm for part 1, for D_a for parts 2 and 3) Fast-diode arrays (filtered for D_a) Edge TS Dalsa (for parts 1 and 2) This run proposes to study three main aspects of edge turbulence: 1) the edge turbulence as the density limit is approached, 2) the poloidal propagation of the turbulent structures (blobs) in LSN and USN, 3) the edge turbulence in He discharges The shot sequence will be as follows: Part 1) Load shot 1031204034. This approaches the density limit by first ramping the current up, increasing the density (hopefully without poloidally detaching) and then ramping the current down (to reduce n_G). Try to hold outer gap at 1.6 cm. !!!Set up NINJA with 10 PSI of He. Do this part with the ASP insertion time and the PSI framing time moved progressively later in time and closer to the density limit. We will puff He thru the NINJA and observe HeI-587 nm with the PSI camera. This should take ~8 good shots. Part 2) We will run successive LSN and USN discharges with all other parameters nominally the same. This is a repeat of what was done during run 1031124. Load shot number 1031124022. Shot 1031124022 had the following segments programmed: Segment 2 - single null lower Segment 3 - single null upper Segment 4 - double null These equilibria have optimized gaps for the scanning probes. When this shot was run, it was with lower null, 0.8MA, NL04=0.77, using segment #2. We would like 4 consecutive good shots alternating lower and upper SN, i.e. changing the segment shot by shot. We will be measuring the parallel flows using the ISP and ASP, together with the dominant poloidal propagation direction of the blobs using the PSI camera. Puff D2 with NINJA, observe Da. This will probably take ~8 shots. Part 3) We will run He discharges and observe the edge turbulence, puffing D_2 with NINJA and observing Da. Insert the ASP and the same time the PSI camera is operating. Run He shot with 0.8 MA, 5.4 T, NL04=0.8e20 m-2, lower single null. This should take ~8 shots. The shot by shot account is as follows. Please see the EDGE topic (USERNAME="Labombard") in the LOGBOOK for notes about the probes. Shots 001-003 tests Shots 004-006 plasmas disrupted just after NINJA puff because Argon was mistakenly being puffed at rather high pressure. Radiation level is certainly more than 100% of the input power. This was mistake in hooking up the gas bottles. Shot 007 - Good shot - n/nG^max=0.71 n/nG at PSI time =0.27 weak images, but blobs nonetheless PSI5 intensifier gated from output on back of controller Timings: PSI5 trigger at 0.7s Fast diode trigger at 0.65s NINJA at 465 Torr tiggered at 0.5 s Shot 008 - Good shot - n/nG^max=0.73 n/nG at PSI time =0.65 many blobs . . PSI5 intensifier gated from output on back of controller Timings: PSI5 trigger at 1.35s Fast diode trigger at 1.25s NINJA at 736 Torr tiggered at 1.2 s Shot 009 - Good shot - n/nG^max=0.76 n/nG at PSI time =0.75 many blobs PSI5 intensifier now being gated using J221. Timings: PSI5 trigger at 1.38s Fast diode trigger at 1.28s NINJA at 736 Torr Shot 010 - Good shot - n/nG^max=0.73 n/nG at PSI time - NA PSI did not trigger even tho trigger pulse was there PSI5 intensifier gated from J221 Timings: PSI5 trigger at 1.38s Fast diode trigger at 1.28s NINJA at 927 Torr tiggered at 1.22 s Shot 011 - Good shot - n/nG^max=0.75 n/nG at PSI time = 0.74 PSI sees good blobs PSI5 intensifier gated from J221 Timings: PSI5 trigger at 1.38s Fast diode trigger at 1.28s NINJA at 927 Torr tiggered at 1.22 s Shot 012 - Good shot - n/nG^max=0.81 n/nG at PSI time = 0.80 PSI sees good blobs PSI5 intensifier gated from J221 Timings: PSI5 trigger at 1.38s Fast diode trigger at 1.28s NINJA at 927 Torr tiggered at 1.22 s Shot 013 - Good shot - n/nG^max=0.9 n/nG at PSI time = 0.81 PSI sees good blobs, defintely see them being born inside the separatrix PSI5 intensifier gated from J221 Timings: PSI5 trigger at 1.38s Fast diode trigger at 1.28s Incresed NINJA pressure NINJA at 1257 Torr tiggered at 1.22 s Shot 014 - fizzle Shot 015 - moved timings to look earlier at much lower n/nG Good shot - emission region is brighter and has moved out. many blobs n/nG^max=0.95 n/nG at PSI time = 0.32 Timings: PSI5 trigger at 0.8s Fast diode trigger at 0.75s NINJA at ~1250 Torr tiggered at 0.65 s Shot 016 - Now going to Part 2 of the run in which we compare Lower and Upper single null geometries with nominally the same parameters. Puff D2 from the NINJA. Observe Da. This shot is with LSN. Good shot - n/n_G=0.26 - blobs propagating poloidally primarily in the downward direction. Timings: PSI5 trigger at .95s Fast diode trigger at .9s NINJA at ~430 Torr tiggered at .75 s Shot 017 - repeat of 016, but with USN Good shot - blobs propagation is different - see poloidal propagation in both directions. Timings: PSI5 trigger at .95s Fast diode trigger at .9s NINJA at ~430 Torr tiggered at .8 s Shot 018 - fizzle Shot 019 - fizzle Shot 020 - go to higher density shot, NL04=1.0e20 m^-2 with LSN Good shot, but no PSI data (failed to arm it, because VNCveiwer was lost just before the shot). Shot 021 - fizzle Shot 022 - repeat of shot 017 with USN, n/n_G=0.25 good shot with many blobs propagating in both directions Timings: PSI5 trigger at .95s Fast diode trigger at .935s NINJA at ~430 Torr tiggered at .8 s Shot 023 - repeat of shot 016 with LSN, n/n_G=0.25 good shot with many blobs propagating primarily in downward direction. Timings: PSI5 trigger at .95s Fast diode trigger at .935s NINJA at ~430 Torr tiggered at .8 s Shot 024 - Now procede to Part 3 of the run, i.e. looking at turbulence in He plasmas. Attempt to repeat the plasma parameters of shots 016 and 023, i.e. NL04=0.75e20 m^-2 and LSN. NINJA is still puffing D2 Observe Da with PSI Plasma density overshoots by alot, NL04=2.1e20 at the PSI time Many blobs, almost all radially propagating Timings: PSI5 trigger at .95s Fast diode trigger at .935s NINJA at ~430 Torr tiggered at .8 s Shot 025 - disrupted at 0.26 s Shot 026 - Try to lower the density to the desired 0.75e20. Also increase the NINJA pressure to increase image signal. Good Shot - got the desired density, but bigger NINJA puff perturbed the density (delta n~1.3e19), and emission was so bright that it saturated the PSI intensifier. Thus the PSI data is corrupted. Timings: PSI5 trigger at .95s Fast diode trigger at .935s NINJA at ~934 Torr tiggered at .8 s Shot 027 - Repeat 026, but with reduced NINJA puff. Good Shot - got the desired density, good PSI data. Many blobs seen, but with very little radial propagation Timings: PSI5 trigger at .95s Fast diode trigger at .935s NINJA at ~934 Torr tiggered at .8 s |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:48:600PM |
| Author: Robert Granetz |
| Physics operator summary for run 1040115 (Thursday): MP 319 (con't) -- SOL turbulence Followed by a few beam-into-gas calibration shots Session leader: J. Terry/S. Zweben Physics operator: R. Granetz Engineers in charge: W. Cochran, E. Fitzgerald, W. Parkin. Summary: This was a very productive day. All three parts of the MP planned for today were completed, with high quality probe and imaging data of the SOL. The only unexpected problem occurred on the first few plasmas, when we mistakenly puffed in argon with the NINJA instead of helium, resulting in early disruptions. This was rectified after shot 6, and then everything went like clockwork. We even had time to do some beam-into-gas calibration shots, although this required running until 17:30. The tokamak ran very well today, especially considering that we purposely had a dozen density limit disruptions in a row during the first part of the run. MP 319: Part 1: shots 07-15 D2, density limit disruptions Part 2: shots 16-23 D2, comparison of SOL in upper and lower x-pts Part 3: shots 24-27 Helium, lower null Beam-into-gas: shots 28-32 TF only (5.4 T), D2 fill at 1.7-1.8 mTorr Scorecard: 21 plasmas 3 fizzles 0 duds 3 tests or no-power shot cycles 0 aborted and/or screwed up by computer problems 5 beam-into-gas calibration shots with B-field(s) ---------- 32 total ------------------------------------------------------------------------------- Engineering setup for Thursday, 15 Jan 2004 MP 319 (con't) -- SOL turbulence Session leader: J. Terry/S. Zweben Physics operator: R. Granetz ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Bake at 60 C overnight as well. Run begins at 09:00 and ends at 17:00. Power systems the same as 1031204034 (1.0 MA, 5.4 T, density limit disruption) A-coils should be hooked up as on 1031204037 (+Dtop -Dbot -Jtop +Jbot), and the power supply should be enabled. Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) **fill NINJA plenum with 10 psi He enabled Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB Necessary diagnostics: ASP and ISP 300 frame PSI camera (filtered for HeI-587nm for part 1, for D_a for parts 2 and 3) Fast-diode arrays (filtered for D_a) Edge TS Dalsa (for parts 1 and 2) ------------------------------------------------------------------------------- RF Setup: not needed ------------------------------------------------------------------------------- Run Plan: The run proposes to study three main aspects of edge turbulence: 1) the edge turbulence as the density limit is approached, 2) the poloidal propagation of the turbulent structures (blobs) in LSN and USN, 3) the edge turbulence in He discharges The shot sequence will be as follows: Part 1) Load shot 1031204034. This approaches the density limit be first ramping the current up and increasing the density (hopefully without poloidally detaching) and then ramping the current down (to reduce n_G). Try to hold outer gap to 1.6 cm. Set up NINJA with 10 PSI of He. Do this with the ASP insertion time and the PSI framing time moved progressively later in time and closer to the density limit. We will puff He thru the NINJA and observe HeI-587 nm with the PSI camera. This should take ~8 good shots. Part 2) We will run successive LSN and USN discharges with all other parameters nominally the same. This is a repeat of what was done during run 1031124. Load shot number 1031124022. Shot 1031124022 had the following segments programmed: Segment 2 - single null lower Segment 3 - single null upper Segment 4 - double null These equilibria have optimized gaps for the scanning probes. When this shot was run, it was with lower null, 0.8MA, NL04=0.77, using segment #2. We would like 4 consecutive good shots alternating lower and upper SN, i.e. changing the segment shot by shot. We will be measuring the parallel flows using the ISP and ASP, together with the dominant poloidal propagation direction of the blobs using the PSI camera. Puff D2 with NINJA, observe Da. This will probably take ~8 shots. Part 3) We will run He discharges and observe the edge turbulence, puffing D_2 with NINJA and observing Da. Insert the ASP and the same time the PSI camera is operating. Load shot 1031106011, a canonical He shot with 0.8 MA, 5.4 T, NL04=0.77e20 m-2, lower single null. This should take ~8 shots. Total of ~24 shots desired. Plan to leave the last hour (4-5 pm) BES for beam into gas calibrations. ------------------------------------------------------------------------------- ECDC was done overnight, as well as a 60 C bake. Hybrid coldstart done by the engineering group; no errors found Loaded PCS segment 1 from shot 1040106003, but reduce prefill to 18 ms PCS segment 2 from shot 1031204034 seg 2 (1.0 MA (ramping down), 5.4 T, density limit disruption) PCS segment 3 from shot 1031124022 seg 3 (0.8 MA, upper null) PCS segment 4 from shot 1031124022 seg 4 (0.8 MA, double null) ------------------------------------------------------------------------------- Shot 01 -- Test of MDS shot cycle. No power. Shot 02 -- Test of MDS shot cycle. No power. All OK. Shot 03 -- No-power test of alternator vibration, with excitation current on. Bearing vibration is within the limit. Shot 04 -- Plasma. Disrupted at t=0.95 s, but I don't think this was a density-limit disruption. The current had not ramped down much, and the density had not ramped up much by that time. I think it was an impurity problem. The NINJA is puffing helium. No A-coil current was programmed, but it doesn't look like there was a locked mode anyway. Next shot: repeat, with A-coils programmed to 2 kA. Shot 05 -- Plasma. Same early disruption as the previous shot. The TCI failed, so the density programming didn't work. The TS gives ne0=2.0e20 m-3. As with the preceding shot, there is something causing a radiated power problem starting at t=0.91 s, which is just after the NINJA starts puffing helium. Next shot: pump out the NINJA plenum, refill with helium, and try again. Shot 06 -- Plasma. Same early disruption, due to radiated power. Tommy went down after the shot and found that the argon and helium bottles were reversed. The NINJA has actually been puffing argon, which explains everything. Next shot: the bottles have been restored to their proper valves, and the plenum and gas lines have been pumped out and refilled with the proper gases. Repeat with no PCS changes. Shot 07 -- Plasma. Good shot. This was a density-limit disruption, although it occurred at about 0.65*n_G. Outer gap is 1.6 cm at the time of the disruption, as requested. Next shot: repeat. No PCS changes, but the NINJA timing is changing. Inner wall probe will also be turned on. Shot 08 -- Plasma. Good shot. Similar density-limit disruption. H/D=2-4%. Brian reports that the inner wall probe may not be functioning mechanically. Next shot: repeat, no PCS changes. Shot 09 -- Plasma. Good shot. Same as the previous 2 shots. Inner wall probe seems to be sticking mechanically. Next shot: repeat, no PCS changes. Shot 10 -- Plasma. Good shot. Same-o, same-o. Tangential Z-meter has big spike during startup. Next shot: repeat, no PCS changes. Shot 11 -- Plasma. Good shot. Same density-limit disruption. The fast framing camera is now looking right near the time of the disruption. Next shot: repeat, no PCS changes. Shot 12 -- Plasma. Good shot. Same-o, same-o. Just what the session leaders want. The ISP has become unstuck. Next shot: repeat, no PCS changes. Shot 13 -- Plasma. Good shot. Same thing. A small molten blob can be seen flying away from the F-port shelf area after the disruption. Jim Terry reports that they clearly see that the blobs are born inside the separatrix as the density limit is approached. Next shot: repeat, no PCS changes. Shot 14 -- Fizzle. Next shot: substract 10 A from IC_EF4 and decrease pre-fill puff by 1 ms. Shot 15 -- Plasma. Good shot. That ends Part 1 of today's run. Next shot: switch to Part 2. Load segment 2 from 1031124022 seg 2. Change NINJA plenum to D2, at 9 psi. Shot 16 -- Plasma. Good full-length lower null shot. Good probe data. Next shot: switch to upper null, which is in segment 3. (I set the programmed density in segment 3 to be the same as in segment 2.) Shot 17 -- Plasma. Good full-length upper null shot. Good probe and imaging data. This upper null shot should be compared with the preceding lower null shot. Next shot: upper null again, but raise nl_04 to 1.0e20 m-2 (from 0.75e20 m-2) Shot 18 -- Plasma. Good full-length upper null shot. nl_04=1.0e20 m-2. Next shot: switch back to lower null, at nl_04=1.0e20 m-2. Shot 19 -- Fizzle. No obvious reason why it didn't go. Next shot: no changes. Shot 20 -- Plasma. Good full-length lower null shot at nl_04=1.0e20 m-2. Next shot: go back to upper null, but reduce density back to nl_04=0.75e20 m-2 (essentially a repeat of shot 17) Shot 21 -- Fizzle. No obvious reason why. Next shot: reduce Br0 by 0.2 mT and reduce prefill by 1 ms. Shot 22 -- Plasma. Good full-length upper null shot at nl_04=0.75e20 m-2. Next shot: switch back to lower null, at nl_04=0.75e20 m-2. Shot 23 -- Plasma. Good full-length lower null shot at nl_04=0.75e20 m-2. Essentially a repeat of shot 16. This ends Part 2 of today's run. Next shot: begin Part 3. Helium plasma...load the C-side plenum with 30 psi of helium. Keep D2 in the NINJA. The equilibrium will be the same as the preceding shot, so no PCS changes. Shot 24 -- Plasma. Helium. Density was much higher than requested, possibly because helium feedback can only go one way (density doesn't reduce during the shot, since helium fully recycles). There were negative glitches on the TCI feedback signal which caused spurious gas puffs, which give too much density. nl_04=2.5e20 m-2. The shot eventually disrupted at t=1.41 s. Next shot: reduce C-side plenum pressure to 16 psi; reduce early pre-programmed valve voltage. Shot 25 -- Plasma. Disrupted very early. Looks like a radiative power problem, but I don't know why. Next shot: try again, no changes Shot 26 -- Plasma. Good helium shot. nl_04=0.8-1.0e20 m-2. The fast framing camera images show signs of being saturated. Next shot: repeat, with reduced sensitivity on the fast camera. Shot 27 -- Plasma. Good full-length helium shot at nl_04=0.8-0.9e20 m-2. Good imaging data. This ends Part 3, and in fact finished up MP 319 for today. Next shot: beam-into-gas for DNB diagnostics. Load from shot 1030521029. Make the following changes: * Be sure that only segment 1 is turned on. * Be sure that PG3 in segment 1 is zeroed * Be sure that the pre-fill is deuterium at 6 psi * Disable all PF supplies * Disable NINJA and all gas valves except B-side-top (pre-fill) * Set fizzle detector after t=0.8 s * Set TF field to have flattop out to t=0.8 s at 150 kA * Set EF3 Auxiliary power off (to kill the gate pulses, and thus open the coil so that no current can be induced). * Make sure that DNB is enabled at t=0.7 s Shot 28 -- Beam-into-gas. Everything worked as desired except that the beam stop-faulted. Chamber pressure was 1.7-1.8 mTorr at t=0.7 s. Btor=5.4 T. Next shot: no changes. Shot 29 -- Beam-into-gas. Good shot, good MSE data. Next shot: no changes. Shot 30 -- Beam-into-gas. Beam stop-faulted. Next shot: tweak anode pressure up a bit. Shot 31 -- Beam-into-gas. Beam fired. Good MSE data. Next shot: insert polarizer and fire again. Shot 32 -- Beam-into-gas. Beam fired. Good MSE data with polarizer. End of run |
| Session Leader Comments | |||
| Jan 16 2004 05:40:21:477PM | Jim Terry | This run is a continuation of MP 319 studying SOL turbulence Session leader: J. Terry Physics operator: R. Granetz Necessary diagnostics: ASP and ISP 300 frame PSI camera (filtered for HeI-587nm for part 1, for D_a for parts 2 and 3) Fast-diode arrays (filtered for D_a) Edge TS Dalsa (for parts 1 and 2) Run Plan: The run proposes to study three main aspects of edge turbulence: 1) the edge turbulence as the density limit is approached, 2) the poloidal propagation of the turbulent structures (blobs) in LSN and USN, 3) the edge turbulence in He discharges The shot sequence will be as follows: Part 1) Load shot 1031204034. This approaches the density limit by first ramping the current up, increasing the density (hopefully without poloidally detaching) and then ramping the current down (to reduce n_G). Try to hold outer gap at 1.6 cm. !!!Set up NINJA with 10 PSI of He. Do this part with the ASP insertion time and the PSI framing time moved progressively later in time and closer to the density limit. We will puff He thru the NINJA and observe HeI-587 nm with the PSI camera. This should take ~8 good shots. Part 2) We will run successive LSN and USN discharges with all other parameters nominally the same. This is a repeat of what was done during run 1031124. Load shot number 1031124022. Shot 1031124022 had the following segments programmed: Segment 2 - single null lower Segment 3 - single null upper Segment 4 - double null These equilibria have optimized gaps for the scanning probes. When this shot was run, it was with lower null, 0.8MA, NL04=0.77, using segment #2. We would like 4 consecutive good shots alternating lower and upper SN, i.e. changing the segment shot by shot. We will be measuring the parallel flows using the ISP and ASP, together with the dominant poloidal propagation direction of the blobs using the PSI camera. Puff D2 with NINJA, observe Da. This will probably take ~8 shots. Part 3) We will run He discharges and observe the edge turbulence, puffing D_2 with NINJA and observing Da. Insert the ASP and the same time the PSI camera is operating. Load shot 1031106011, a canonical He shot with 0.8 MA, 5.4 T, NL04=0.77e20 m-2, lower single null. This should take ~8 shots. | |
| Jan 16 2004 05:41:24:803PM | 1040115004 | Jim Terry | 1st plasma attempt Timings: PSI5 trigger at 0.9s Fast diode trigger at 0.85s NINJA at ~460 Torr tiggered at 0.75 s Plasma disrupts at 0.95 s, after softs go screaming up. Nothing on PSI |
| Jan 16 2004 05:41:51:083PM | 1040115005 | Jim Terry | Move PSI intensifier trigger from J221 to signal from back of controller Timings: PSI5 trigger at 0.9s Fast diode trigger at 0.8s NINJA at ~460 Torr tiggered at 0.75 s Plasma still disrupts at 0.95 s, after softs go screaming up. Nothing on PSI No He seen on Chromex! |
| Jan 16 2004 05:47:02:930PM | 1040115006 | Jim Terry | moved timings to look earlier, although I failed to move the NINJA puff back PSI5 intensifier gated from J221 Timings: PSI5 trigger at 0.7s Fast diode trigger at 0.65s NINJA at ~460 Torr tiggered at 0.75 s - OOPS Plasma still disrupts at 0.95 s, after softs go screaming up. Found that Ar was being puffed thru the NINJA instead of He! This was due to a mix-up of gas bottles and PLC screen labeling. This explains the results of the last three shots in which no He was seen by the PSI and by any of the spectrometers. |
| Jan 16 2004 05:45:29:990PM | 1040115007 | Jim Terry | Fixed the NINJA gas problem, so that He is being puffed PSI5 intensifier gated from output on back of controller Timings: PSI5 trigger at 0.7s Fast diode trigger at 0.65s NINJA at 465 Torr tiggered at 0.5 s Good shot - n/nG^max=0.71 n/nG at PSI time =0.27 got weak images, but blobs nonetheless |
| Jan 16 2004 05:48:23:803PM | 1040115008 | Jim Terry | PSI5 intensifier gated from output on back of controller Timings: PSI5 trigger at 1.35s Fast diode trigger at 1.25s NINJA at 736 Torr tiggered at 1.2 s Good shot - n/nG^max=0.73 n/nG at PSI time =0.65 many blobs |
| Jan 16 2004 05:48:55:477PM | 1040115009 | Jim Terry | PSI5 intensifier now being gated using J221. Timings: PSI5 trigger at 1.38s Fast diode trigger at 1.28s NINJA at 736 Torr Good shot - n/nG^max=0.76 n/nG at PSI time =0.75 many blobs |
| Jan 16 2004 05:49:24:773PM | 1040115010 | Jim Terry | PSI5 intensifier gated from J221 Timings: PSI5 trigger at 1.38s Fast diode trigger at 1.28s NINJA at 927 Torr tiggered at 1.22 s Good shot - n/nG^max=0.73 n/nG at PSI time - NA PSI did not trigger even tho trigger pulse was there |
| Jan 16 2004 05:49:48:880PM | 1040115011 | Jim Terry | PSI5 intensifier gated from J221 Timings: PSI5 trigger at 1.38s Fast diode trigger at 1.28s NINJA at 927 Torr tiggered at 1.22 s Good shot - n/nG^max=0.75 n/nG at PSI time = 0.74 PSI sees good blobs |
| Jan 16 2004 05:50:18:740PM | 1040115012 | Jim Terry | PSI5 intensifier gated from J221 Timings: PSI5 trigger at 1.38s Fast diode trigger at 1.28s NINJA at 927 Torr tiggered at 1.22 s Good shot - n/nG^max=0.81 n/nG at PSI time = 0.80 PSI sees good blobs |
| Jan 16 2004 05:50:42:477PM | 1040115013 | Jim Terry | PSI5 intensifier gated from J221 Timings: PSI5 trigger at 1.38s Fast diode trigger at 1.28s Incresed NINJA pressure NINJA at 1257 Torr tiggered at 1.22 s Good shot - n/nG^max=0.9 n/nG at PSI time = 0.81 PSI sees good blobs, defintely see them being born inside the separatrix |
| Jan 16 2004 05:51:03:193PM | 1040115014 | Jim Terry | moved timings to look earlier at much lower n/nG PSI5 intensifier gated from J221 Timings: PSI5 trigger at 0.8s Fast diode trigger at 0.75s NINJA at 927 Torr tiggered at 0.65 s fizzle |
| Jan 16 2004 05:51:46:850PM | 1040115015 | Jim Terry | moved timings to look earlier at much lower n/nG Timings: PSI5 trigger at 0.8s Fast diode trigger at 0.75s NINJA at ~1250 Torr tiggered at 0.65 s Good shot - emission region is brighter and has moved out. many blobs n/nG^max=0.95 n/nG at PSI time = 0.32 |
| Jan 16 2004 05:52:12:583PM | 1040115016 | Jim Terry | Now going to Part 2 of the run in which we compare Lower and Upper single null geometries with nominally the same parameters. Puff D2 from the NINJA. Observe Da This shot is with LSN. Good shot - blobs propagating poloidally primarily in the downward direction. Timings: PSI5 trigger at .95s Fast diode trigger at .9s NINJA at ~430 Torr tiggered at .75 s |
| Jan 16 2004 05:52:41:710PM | 1040115017 | Jim Terry | Repeat, but with USN Good shot - blobs propagation is different - see poloidal propagation in both directions. Timings: PSI5 trigger at .95s Fast diode trigger at .9s NINJA at ~430 Torr tiggered at .8 s |
| Jan 16 2004 05:53:17:630PM | 1040115018 | Jim Terry | Try to repeat higher density shot, NL04=1.0e20 m^-2, but with LSN fizzle Timings: PSI5 trigger at .95s Fast diode trigger at .935s NINJA at ~430 Torr tiggered at .8 s |
| Jan 16 2004 05:53:50:443PM | 1040115019 | Jim Terry | Again try to repeat higher density shot, NL04=1.0e20 m^-2, but with LSN fizzle Timings: PSI5 trigger at .95s Fast diode trigger at .935s NINJA at ~430 Torr tiggered at .8 s |
| Jan 16 2004 05:54:44:600PM | 1040115020 | Jim Terry | Try again to repeat higher density shot, NL04=1.0e20 m^-2, but with LSN Good shot, but I couldn't trigger the PSI because I lost the VNCveiwer just be fore the shot. So no PSI data! Timings: PSI5 trigger at .95s Fast diode trigger at .935s NINJA at ~430 Torr tiggered at .8 s |
| Jan 16 2004 05:55:10:600PM | 1040115021 | Jim Terry | go back and repeat shot 017, with medium density and USN fizzle Timings: PSI5 trigger at .95s Fast diode trigger at .935s NINJA at ~430 Torr tiggered at .8 s |
| Jan 16 2004 05:55:37:867PM | 1040115022 | Jim Terry | go back and repeat shot 017, with medium density and USN good shot with many blobs propagating in both directions Timings: PSI5 trigger at .95s Fast diode trigger at .935s NINJA at ~430 Torr tiggered at .8 s |
| Jan 16 2004 05:56:14:727PM | 1040115023 | Jim Terry | Now try to repeat shot 016, with medium density and LSN good shot with many blobs propagating primarily in the downward direction Timings: PSI5 trigger at .95s Fast diode trigger at .935s NINJA at ~430 Torr tiggered at .8 s |
| Jan 16 2004 05:56:37:273PM | 1040115024 | Jim Terry | Now procede to Part 3 of the run, i.e. looking at turbulence in He plasmas. Attempt to repeat the plasma parameters of shots 016 and 023, i.e. NL04=0.75e20 m^-2 and LSN. NINJA is still puffing D2 Observe Da with PSI Plasma density overshoots by alot, NL04=2.1e20 at the PSI time Many blobs, almost all radially propagating Timings: PSI5 trigger at .95s Fast diode trigger at .935s NINJA at ~430 Torr tiggered at .8 s |
| Jan 16 2004 05:57:04:507PM | 1040115025 | Jim Terry | Try to lower the density to the desired 0.75e20. Disrupted at 0.26s, so got no PSI data. Timings: PSI5 trigger at .95s Fast diode trigger at .935s NINJA at ~430 Torr tiggered at .8 s |
| Jan 16 2004 05:57:39:523PM | 1040115026 | Jim Terry | Try again to lower the density to the desired 0.75e20. Also increase the NINJA pressure to increase image signal. Good Shot - got the desired density, but bigger NINJA puff perturbed the density (delta~1.3e19), and emission was so bright that it saturated the PSI intensifier. Thus the PSI data is corrupted. Timings: PSI5 trigger at .95s Fast diode trigger at .935s NINJA at ~934 Torr tiggered at .8 s |
| Jan 16 2004 05:58:12:337PM | 1040115027 | Jim Terry | Repeat, but with reduced NINJA puff. Good Shot - got the desired density, good PSI data. Many blobs seen, but with very little radial propagation Timings: PSI5 trigger at .95s Fast diode trigger at .935s NINJA at ~934 Torr tiggered at .8 s |
| Physics Operator Comments | |||
| Jan 14 2004 04:40:24:453PM | Robert Granetz | Engineering setup for Thursday, 15 Jan 2004 MP 319 (con't) -- SOL turbulence Session leader: J. Terry/S. Zweben Physics operator: R. Granetz ECDC overnight in D2 at 2e-4 Torr, stopping by 07:00. Bake at 60 C overnight as well. Run begins at 09:00 and ends at 17:00. Power systems the same as 1031204034 (1.0 MA, 5.4 T, density limit disruption) A-coils should be hooked up as on 1031204037 (+Dtop -Dbot -Jtop +Jbot), and the power supply should be enabled. Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) **fill NINJA plenum with 10 psi He enabled Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB Necessary diagnostics: ASP and ISP 300 frame PSI camera (filtered for HeI-587nm for part 1, for D_a for parts 2 and 3) Fast-diode arrays (filtered for D_a) Edge TS Dalsa (for parts 1 and 2) ------------------------------------------------------------------------------- RF Setup: not needed ------------------------------------------------------------------------------- Run Plan: The run proposes to study three main aspects of edge turbulence: 1) the edge turbulence as the density limit is approached, 2) the poloidal propagation of the turbulent structures (blobs) in LSN and USN, 3) the edge turbulence in He discharges The shot sequence will be as follows: Part 1) Load shot 1031204034. This approaches the density limit be first ramping the current up and increasing the density (hopefully without poloidally detaching) and then ramping the current down (to reduce n_G). Try to hold outer gap to 1.6 cm. Set up NINJA with 10 PSI of He. Do this with the ASP insertion time and the PSI framing time moved progressively later in time and closer to the density limit. We will puff He thru the NINJA and observe HeI-587 nm with the PSI camera. This should take ~8 good shots. Part 2) We will run successive LSN and USN discharges with all other parameters nominally the same. This is a repeat of what was done during run 1031124. Load shot number 1031124022. Shot 1031124022 had the following segments programmed: Segment 2 - single null lower Segment 3 - single null upper Segment 4 - double null These equilibria have optimized gaps for the scanning probes. When this shot was run, it was with lower null, 0.8MA, NL04=0.77, using segment #2. We would like 4 consecutive good shots alternating lower and upper SN, i.e. changing the segment shot by shot. We will be measuring the parallel flows using the ISP and ASP, together with the dominant poloidal propagation direction of the blobs using the PSI camera. Puff D2 with NINJA, observe Da. This will probably take ~8 shots. Part 3) We will run He discharges and observe the edge turbulence, puffing D_2 with NINJA and observing Da. Insert the ASP and the same time the PSI camera is operating. Load shot 1031106011, a canonical He shot with 0.8 MA, 5.4 T, NL04=0.77e20 m-2, lower single null. This should take ~8 shots. Total of ~24 shots desired. Plan to leave the last hour (4-5 pm) BES for beam into gas calibrations. | |
| Jan 15 2004 08:20:27:507AM | Robert Granetz | ECDC was done overnight, as well as a 60 C bake. Hybrid coldstart done by the engineering group; no errors found Loaded PCS segment 1 from shot 1040106003, but reduce prefill to 18 ms PCS segment 2 from shot 1031204034 seg 2 (1.0 MA (ramping down), 5.4 T, density limit disruption) PCS segment 3 from shot 1031124022 seg 3 (0.8 MA, upper null) PCS segment 4 from shot 1031124022 seg 4 (0.8 MA, double null) | |
| Jan 15 2004 08:31:05:310AM | 1040115001 | Robert Granetz | Shot 01 -- Test of MDS shot cycle. No power. |
| Jan 15 2004 09:00:27:883AM | 1040115002 | Robert Granetz | Shot 02 -- Test of MDS shot cycle. No power. All OK. |
| Jan 15 2004 09:29:10:360AM | 1040115003 | Robert Granetz | Shot 03 -- No-power test of alternator vibration, with excitation current on. Bearing vibration is within the limit. |
| Jan 15 2004 10:02:08:343AM | 1040115004 | Robert Granetz | Shot 04 -- Plasma. Disrupted at t=0.95 s, but I don't think this was a density-limit disruption. The current had not ramped down much, and the density had not ramped up much by that time. I think it was an impurity problem. The NINJA is puffing helium. No A-coil current was programmed, but it doesn't look like there was a locked mode anyway. Next shot: repeat, with A-coils programmed to 2 kA. |
| Jan 15 2004 10:20:06:877AM | 1040115005 | Robert Granetz | Shot 05 -- Plasma. Same early disruption as the previous shot. The TCI failed, so the density programming didn't work. The TS gives ne0=2.0e20 m-3. As with the preceding shot, there is something causing a radiated power problem starting at t=0.91 s, which is just after the NINJA starts puffing helium. Next shot: pump out the NINJA plenum, refill with helium, and try again. |
| Jan 15 2004 10:35:44:020AM | 1040115006 | Robert Granetz | Shot 06 -- Plasma. Same early disruption, due to radiated power. Tommy went down after the shot and found that the argon and helium bottles were reversed. The NINJA has actually been puffing argon, which explains everything. Next shot: the bottles have been restored to their proper valves, and the plenum and gas lines have been pumped out and refilled with the proper gases. Repeat with no PCS changes. |
| Jan 15 2004 11:10:03:510AM | 1040115007 | Robert Granetz | Shot 07 -- Plasma. Good shot. This was a density-limit disruption, although it occurred at about 0.65*n_G. Outer gap is 1.6 cm at the time of the disruption, as requested. Next shot: repeat. No PCS changes, but the NINJA timing is changing. Inner wall probe will also be turned on. |
| Jan 15 2004 11:36:28:897AM | 1040115008 | Robert Granetz | Shot 08 -- Plasma. Good shot. Similar density-limit disruption. H/D=2-4%. Brian reports that the inner wall probe may not be functioning mechanically. Next shot: repeat, no PCS changes. |
| Jan 15 2004 11:53:27:150AM | 1040115009 | Robert Granetz | Shot 09 -- Plasma. Good shot. Same as the previous 2 shots. Inner wall probe seems to be sticking mechanically. Next shot: repeat, no PCS changes. |
| Jan 15 2004 12:03:18:737PM | 1040115010 | Robert Granetz | Shot 10 -- Plasma. Good shot. Same-o, same-o. Tangential Z-meter has big spike during startup. Next shot: repeat, no PCS changes. |
| Jan 15 2004 12:18:02:210PM | 1040115011 | Robert Granetz | Shot 11 -- Plasma. Good shot. Same density-limit disruption. The fast framing camera is now looking right near the time of the disruption. Next shot: repeat, no PCS changes. |
| Jan 15 2004 12:43:46:453PM | 1040115012 | Robert Granetz | Shot 12 -- Plasma. Good shot. Same-o, same-o. Just what the session leaders want. The ISP has become unstuck. Next shot: repeat, no PCS changes. |
| Jan 15 2004 12:58:25:413PM | 1040115013 | Robert Granetz | Shot 13 -- Plasma. Good shot. Same thing. A small molten blob can be seen flying away from the F-port shelf area after the disruption. Jim Terry reports that they clearly see that the blobs are born inside the separatrix as the density limit is approached. Next shot: repeat, no PCS changes. |
| Jan 15 2004 01:06:00:017PM | 1040115014 | Robert Granetz | Shot 14 -- Fizzle. Next shot: substract 10 A from IC_EF4 and decrease pre-fill puff by 1 ms. |
| Jan 15 2004 01:25:56:420PM | 1040115015 | Robert Granetz | Shot 15 -- Plasma. Good shot. That ends Part 1 of today's run. Next shot: switch to Part 2. Load segment 2 from 1031124022 seg 2. Change NINJA plenum to D2, at 9 psi. |
| Jan 15 2004 01:42:43:923PM | 1040115016 | Robert Granetz | Shot 16 -- Plasma. Good full-length lower null shot. Good probe data. Next shot: switch to upper null, which is in segment 3. (I set the programmed density in segment 3 to be the same as in segment 2.) |
| Jan 15 2004 01:55:22:603PM | 1040115017 | Robert Granetz | Shot 17 -- Plasma. Good full-length upper null shot. Good probe and imaging data. This upper null shot should be compared with the preceding lower null shot. Next shot: upper null again, but raise nl_04 to 1.0e20 m-2 (from 0.75e20 m-2) |
| Jan 15 2004 02:05:00:813PM | 1040115018 | Robert Granetz | Shot 18 -- Plasma. Good full-length upper null shot. nl_04=1.0e20 m-2. Next shot: switch back to lower null, at nl_04=1.0e20 m-2. |
| Jan 15 2004 02:20:24:943PM | 1040115019 | Robert Granetz | Shot 19 -- Fizzle. No obvious reason why it didn't go. Next shot: no changes. |
| Jan 15 2004 02:37:17:023PM | 1040115020 | Robert Granetz | Shot 20 -- Plasma. Good full-length lower null shot at nl_04=1.0e20 m-2. Next shot: go back to upper null, but reduce density back to nl_04=0.75e20 m-2 (essentially a repeat of shot 17) |
| Jan 15 2004 03:01:28:553PM | 1040115021 | Robert Granetz | Shot 21 -- Fizzle. No obvious reason why. Next shot: reduce Br0 by 0.3 mT and reduce prefill by 1 ms. |
| Jan 15 2004 03:07:08:080PM | 1040115022 | Robert Granetz | Shot 22 -- Plasma. Good full-length upper null shot at nl_04=0.75e20 m-2. Next shot: switch back to lower null, at nl_04=0.75e20 m-2. |
| Jan 15 2004 03:21:42:957PM | 1040115023 | Robert Granetz | Shot 23 -- Plasma. Good full-length lower null shot at nl_04=0.75e20 m-2. Essentially a repeat of shot 16. This ends Part 2 of today's run. Next shot: begin Part 3. Helium plasma...load the C-side plenum with 30 psi of helium. Keep D2 in the NINJA. The equilibrium will be the same as the preceding shot, so no PCS changes. |
| Jan 15 2004 03:44:35:673PM | 1040115024 | Robert Granetz | Shot 24 -- Plasma. Helium. Density was much higher than requested, possibly because helium feedback can only go one way (density doesn't reduce during the shot, since helium fully recycles). There were negative glitches on the TCI feedback signal which caused spurious gas puffs, which give too much density. nl_04=2.5e20 m-2. The shot eventually disrupted at t=1.41 s. Next shot: reduce C-side plenum pressure to 16 psi; reduce early pre-programmed valve voltage. |
| Jan 15 2004 03:54:40:950PM | 1040115025 | Robert Granetz | Shot 25 -- Plasma. Disrupted very early. Looks like a radiative power problem, but I don't know why. Next shot: try again, no changes |
| Jan 15 2004 04:08:51:670PM | 1040115026 | Robert Granetz | Shot 26 -- Plasma. Good helium shot. nl_04=0.8-1.0e20 m-2. The fast framing camera images show signs of being saturated. Next shot: repeat, with reduced sensitivity on the fast camera. |
| Jan 15 2004 04:36:40:980PM | 1040115027 | Robert Granetz | Shot 27 -- Plasma. Good full-length helium shot at nl_04=0.8-0.9e20 m-2. Good imaging data. This ends Part 3, and in fact finished up MP 319 for today. Next shot: beam-into-gas for DNB diagnostics. Load from shot 1030521029. Make the following changes: * Be sure that only segment 1 is turned on. * Be sure that PG3 in segment 1 is zeroed * Be sure that the pre-fill is deuterium at 6 psi * Disable all PF supplies * Disable NINJA and all gas valves except B-side-top (pre-fill) * Set fizzle detector after t=0.8 s * Set TF field to have flattop out to t=0.8 s at 150 kA * Set EF3 Auxiliary power off (to kill the gate pulses, and thus open the coil so that no current can be induced). * Make sure that DNB is enabled at t=0.7 s |
| Jan 15 2004 04:35:14:357PM | 1040115028 | Robert Granetz | Shot 28 -- Beam-into-gas. Everything worked as desired except that the beam stop-faulted. Chamber pressure was 1.7-1.8 mTorr at t=0.7 s. Btor=5.4 T. Next shot: no changes. |
| Jan 20 2004 12:48:04:040PM | 1040115028 | Robert Granetz | Physop instructions for beam-into-gas shots: (1) Load from shot 1040115028 (TF only, 5.4 tesla, deuterium gas) (2) Confirm the following: * Be sure that only segment 1 is turned on. Turn off all other segments. * Be sure that PG3 in segment 1 is zeroed * Be sure that the pre-fill is deuterium at 6 psi * Disable (using the PLC's) all PF supplies * Open the PF breakers * Disable NINJA and all gas valves except B-side-top (pre-fill) * Set fizzle detector after t=0.8 s * Set TF field to have flattop out to t=0.8 s (or later) at 150 kA * Set EF3 Auxiliary power off (to kill the gate pulses, and thus open the coil so that no current can be induced). * Make sure that DNB is enabled at t=0.7 s (3) If one or more PF fields are required, then: * Close the corresponding breaker * Enable (using the PLC's) the appropriate supplies * If using EF3, set the Aux power on (to generate the gate pulses) * Draw the appropriate waveforms in segment 1 of PCS. If unipolar, constant currents are desired, it might be easier to run under PLC control rather than hybrid control. Additional keywords for logbook searches: beam into gas, DNB, calibration, settings |
| Jan 15 2004 05:03:00:973PM | 1040115029 | Robert Granetz | Shot 29 -- Beam-into-gas. Good shot, good MSE data. Next shot: no changes. |
| Jan 15 2004 05:03:11:473PM | 1040115030 | Robert Granetz | Shot 30 -- Beam-into-gas. Beam stop-faulted. Next shot: tweak anode pressure up a bit. |
| Jan 15 2004 05:19:46:633PM | 1040115031 | Robert Granetz | Shot 31 -- Beam-into-gas. Beam fired. Good MSE data. Next shot: insert polarizer and fire again. |
| Jan 15 2004 05:30:26:687PM | 1040115032 | Robert Granetz | Shot 32 -- Beam-into-gas. Beam fired. Good MSE data with polarizer. End of run |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:24:41:207AM | Test | Ok | |
| 2 | 08:57:20:807AM | Test | Ok | |
| 3 | 09:27:16:877AM | Test | Ok | Alternator Ramp Test |
| 4 | 09:40:54:633AM | Plasma | Ok | |
| 5 | 10:02:45:390AM | Plasma | Ok | |
| 6 | 10:22:27:780AM | Plasma | Ok | |
| 7 | 10:57:45:100AM | Plasma | Ok | |
| 8 | 11:20:25:783AM | Plasma | Ok | |
| 9 | 11:41:21:877AM | Plasma | Ok | |
| 10 | 11:58:02:803AM | Plasma | Ok | |
| 11 | 12:14:35:180PM | Plasma | Ok | |
| 12 | 12:31:51:103PM | Plasma | Ok | |
| 13 | 12:45:50:983PM | Plasma | Ok | |
| 14 | 12:59:31:443PM | Plasma | Ok | |
| 15 | 01:16:00:273PM | Plasma | Ok | |
| 16 | 01:34:06:323PM | Plasma | Ok | |
| 17 | 01:47:10:470PM | Plasma | Ok | |
| 18 | 02:00:34:100PM | Plasma | Ok | |
| 19 | 02:15:00:323PM | Plasma | Ok | |
| 20 | 02:31:40:277PM | Plasma | Ok | |
| 21 | 02:44:50:253PM | Plasma | Ok | |
| 22 | 03:00:50:990PM | Plasma | Ok | |
| 23 | 03:15:26:620PM | Plasma | Ok | |
| 24 | 03:28:20:530PM | Plasma | Ok | |
| 25 | 03:43:21:647PM | Plasma | Ok | |
| 26 | 03:58:41:913PM | Plasma | Ok | |
| 27 | 04:11:59:480PM | Plasma | Ok | |
| 28 | 04:25:07:003PM | Test | Ok | TF & pre-fill only |
| 29 | 04:37:19:807PM | Test | Ok | tf & pre fill only |
| 30 | 04:53:59:497PM | Test | Ok | TF and pre-fill only |
| 31 | 05:11:21:687PM | Test | Ok | TF Pre-fill only |
| 32 | 05:28:02:813PM | Test | Ok | TF Pre-fill only |