| Miniproposals | ||||||||||||
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| Operators | |
| Session leader(s): | Sanjay Gangadhara,Brian Labombard |
| Physics operator(s): | Joseph Snipes |
| Engineering operator(s): | Unknown |
| Engineering Operator Run Comment |
| Run Plan for Wed. AUG. 25, 1999. MP#208/228 PLumes and SOL Transport. La |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:20:990PM |
| Author: To Be Determined |
| Session Leader's summary of run 990825 MP#208 - Plume Imaging MP#228 - SOL Transport Physics Operator: Snipes Session Leader: LaBombard,Gangadhara Given the rare opportunity to collect some data for MP#208 and MP#228 during this period of otherwise intense focus on RF commissioning and conditioning, we developed a rather ambitious run plan. In one run, we attempted to finish MP#208 and to provide some badly needed Bt scaling data by way of ohmic H-modes for the SOL transport studies in MP#228. In the end, we settled on doing a good job to finish MP#208 at the cost of deferring any work on MP#228 to another run - the risk being that another dedicated run for MP#228 may not happen in this campaign. ================================================================================ First half Run Plan: ================================================================================ Plume Imaging MP#208 Objectives: Capture images of CII and CIII "plumes" to provide information on parallel and cross-field transport in the SOL in a variety of ohmic plasma conditions: (1) Investigate the dependence of cross-field spreading of C+1, C+2 (i.e., cross-field transport) at fixed locations in the SOL as a function of plasma density (or collisionality) (2) Investigate dependence of cross-field impurity transport on SOL location (rho) in fixed discharge conditions (3) Investigate parallel flow of background plasma (via parallel C+1, C+2 spreading) as a function of SOL location and plasma collisionality. Setup: FSP: - Operate in two bias modes: (a) West/East-sweep, North/South-float mode (b) West/South-sweep, North/East-float mode - Enable gas (C2H4) for plumes - Set up for a "deep" scan to the separatrix - Set up for a "shallow" scan to about rho=7 mm (10 mm below LCFS target in vertical position) ASP: - Operate in two bias modes: (South probe is dead!) (a) West/East-sweep, North-float mode (b) West-sweep, North/East-float mode - Set up for a "deep" scan to the separatrix with current sensing resistor set at 2 ohms - Set up for a "shallow" scan to about rho=10 mm with current sensing resistor set at 10 ohms FMP: - Operate in two bias modes: (a) Divertor probes in sweep and Vf mode with gated fast sampling (b) Divertor probes in Isat and Vf mode with continuous fast sampling Starting Discharge: 1 MA, 5.1 tesla, Ohmic, > 1.5 cm gaps, with optimized FSP Target. Start from 990824002 with outer gap and inner gaps increased to 1.5 cm Shot plan: 1-2 NL04=1.0e20, setup target, gas, etc. 3-6 NL04=1.0e20, with 4-shot sequence: I - FSP/ASP/FMP in (a) bias mode, "shallow" FSP/ASP insertion with C2H4 plumes, CIII filters II - FSP/ASP/FMP in (b) bias mode, "shallow" FSP/ASP insertion with C2H4 plumes, CII filters III - FSP/ASP/FMP in (a) bias mode, "deep" FSP/ASP insertion with C2H4 plumes, CIII filters IV - FSP/ASP/FMP in (b) bias mode, "deep" FSP/ASP insertion with C2H4 plumes, CII filters 7-10 NL04=0.6e20, repeat 4-shot sequence 11-14 NL04=1.4e20, repeat 4-shot sequence 15-16 NL04=1.0e20, Ip = 1.2 MA, do sequence III,IV 17-18 NL04=1.0e20, Ip = 0.8 MA, do sequence III,IV ================================================================================ Results: Discharges for MP#208 were executed almost according to plan. We found that for some reason Mach data taken during the NL04=0.6e20 sequence did not exhibit the usual reversed parallel flows in the SOL. Perhaps the FSP was not inserted deep enough. Consequently, we dropped the Ip scan and instead went to a series of 4 shots with NL04=0.85e20 and deep FSP insertion. Reversed flows were seen and plumes exhibited a corresponding parallel shift away from the divertor. Good CII and CIII plumes were seen on most of the shots. From analysis of the difference in CII and CIII emission patterns, we hope to learn something about the cross-field and parallel transport of impurity ions in the SOL. Hopefully, these data will be an important part of Sanjay's doctoral thesis. Actual Shot summary: shot NL04 Plume Location Filter Probe Bias Mode Comment 1 1.0 moderate CIII Mach FSP-camera timing is off, dithering 2 1.0 deep CIII Mach ok plumes, dithering 3 1.0 deep CII Fluctuation Nice plumes, dithering 4 1.0 shallow CIII Mach Nice Plumes, dithering 5 1.0 shallow CIII Fluctuation Nice Plumes, dithering 6 0.7 shallow CIII Mach FSP had trouble scanning! 7 0.7 shallow CIII Mach FSP scanned OK. CIII plumes too weak 8 0.7 shallow CIII Mach Plumes OK, still a bit weak 9 0.7 shallow CII Fluctuation Plumes ok 10 0.7 deep CIII Mach Plumes look good 11 0.7 deep CII Fluctuation Plumes look good 12 1.3 shallow CIII Mach Plumes are saturated 13 1.3 shallow CIII Mach One good plume, disrupts at 0.61 sec 14 fizzle 15 1.3 shallow CIII Mach Plumes look good 16 1.3 shallow CII Fluctuation Plumes look good, narrow poloidal extent 17 1.3 deep CIII Mach Small extent CIII plumes 18 1.3 deep CII Fluctuation Plumes are tiny 19 0.85 shallow CIII Mach Good plumes, dithering on third scan 20 0.85 shallow CII Fluctuation Plumes are OK, Argon enabled, still dithering on third scan 21 0.85 deep CIII Mach Plumes are OK, Argon enabled, still dithering on third scan 22 0.85 deep CII Fluctuation Plumes are OK, Argon enabled, still dithering on third scan ================================================================================ Second half run plan: ================================================================================ SOL Transport MP#228 Objectives: Record cross-field SOL profiles of density, Te, // flow, and fluctuations in ohmic H-mode discharges with different end of shot 'flat-top' Bt but roughly the same qPsi95. Setup: FSP: - Operate in two bias modes: (a) West/East-sweep, North/South-float mode (b) West/South-sweep, North/East-float mode - Enable gas (C2H4) for optional plumes - Set up for a "deep" scan to the separatrix ASP: - Operate in two bias modes: (South probe is dead) (a) West/East-sweep, North-float mode (b) West-sweep, North/East-float mode - Set up for a "deep" scan to the separatrix FMP: - Operate in two bias modes: (a) Divertor probes in sweep and Vf mode with gated fast sampling (b) Divertor probes in Isat and Vf mode with continuous fast sampling Set fast triggers to capture Ohmic H-mode phase. Starting Discharge: Reload segment 3 (which is presently a modified version of segment 3 from shot# 990819001): 1 MA, Ohmic H-mode ending with Bt at 5 tesla Shot plan: 19-20 setup discharge and targeting 21-22 FSP/ASP/FMP in bias mode (a) then (b) 23 Change end point Bt to 3.5 tesla, Ip = 0.7 MA. 24-25 FSP/ASP/FMP in bias mode (a) then (b) 26 Change end point Bt to 6.0 tesla, Ip = 1.2 MA. 27-28 FSP/ASP/FMP in bias mode (a) then (b) ================================================================================ Result: No discharges run. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:08:600PM |
| Author: To Be Determined |
| Engineering setup and run plan for Wednesday 25 August 1999 MP#208/228 Plumes and SOL Transport SL: B. LaBombard and S. Gangadhara PO: J. Snipes Run will begin at 9:00AM and end at 5:00PM. For the plume studies, start with standard 1MA 5.1T plasmas (like 990824002). Run four identical shots to scan the FSP together with different carbon filters viewing the probe. Then, the density will be scanned from nl04 = 0.6 x 10^20 m^-2 to 1.4 x 10^20 m^-2 in separate series of similar shots. For the SOL Transport studies, we will use ohmic H-mode discharges like 990819001 to start with. Then, we will vary the toroidal field at the end of the H-mode to perform a TF scan in H-mode from 3 T to 6 T. We will raise or lower the current to maintain the H-mode over this range of toroidal fields staying at nearly constant q95 at the end of the H-mode to avoid low q disruptions. Engineering setup: *** Two hours of ECDC in D2 prior to the run. *** Setup power supplies from 990824002 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 6 psi of H2 Hybrid DISABLED fill C-side with 30 psi of D2 Hybrid enabled leave J-bottom as is Hybrid DISABLED The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV Summary: It was a very good run. The machine ran very well with only a slight delay to investigate an intermittent problem with EFC whereby the static voltage reached only 700 V and drooped to 500 V instead of reaching 1000 V and drooping to 700 V as it usually does. The problem went away on the next shot. Only the MP 208 Plume studies was accomplished because it really was asking too much to do two mini-proposals in one day. With 4 good shots required for shallow and deep probe insertion with CII and CIII filters and proper camera exposure, we were able to scan 4 different densities and got good data for all conditions. The current scan was not attempted in favor of an intermediate density point. The RF also managed to get in some conditioning late in the discharge and they were able to get into H-mode with low power on both E and J port antennas. On the last shot, the RF managed to combine J3, J4, and E port antennas to reach 2 MW peak and got a nice H-mode at the end of the discharge. Some fluctuations were observed on the PCI and reflectometer that appear to be at the same frequency during H-mode. They were not present on the magnetics. Of 22 shots, only one was a fizzle (though not by Ian's program, see below), which was probably due to overcooling because of a one hour delay to check out the EFC power supply. One shot disrupted at 0.6 sec perhaps due to the EFC problem. The other 20 shots were full length 1 MA plasmas many of which ramped down past 1.8 sec due to a change in RCUR in the rampdown. Shot 1: Copied shot 990824002, then dropped nl04 from 1.1 to 1.0 x 10^20 m^-2. Reduced RCUR by 4 mm until 1.2 sec, then shifted it back out so that we should have 1.5 cm inner and outer gaps until 1.2 sec, then decrease the gap to 1 cm. Good shot! Shot 2: Changed RCUR slightly after 1.2 sec to increase outer gap to 1.2 cm for the RF at the end of the shot. Good shot! Shot 3: Repeat. Good shot. Shot 4: Repeat. Good shot. Shot 5: Repeat. Good shot. Shot 6: Reducing nl04 to 0.6 x 10^20 m^-2. Good shot! Shot 7: Changed nl04 to 0.7 x 10^20 m^-2 to try to ensure the same density for the next shot. Good shot. Br jumped down by 1 mT. RF between 1.2 and 1.4 sec from 0.2 to 0.3 MW. H-mode during RF becoming EDA in the rampdown. Shot 8: Increased Br0 by 0.5 mT to 0 mT. Good shot. Again, RF H-mode at the end of the shot. Shot 9: Repeat. Good shot. Disrupted at 1.4 sec due to a large impurity injection just as the RF shuts off in H-mode. Shot 10: Repeat without RF. Good shot. Spectroscopy tree corrupted. No spectroscopy data for this shot! Shot 11: Repeat. Good shot. Shot 12: Raising nl04 to 1.4 x 10^20 m^-2. Good shot. Achieved 1.3 x 10^20 m^-2. Shot 13: Reduced nl04 to 1.3 x 10^20 m^-3 to try to keep the density there. Kept RCUR out at 0.669 m after 1.4 sec to try to avoid the disruption at 1.6 sec. It may also be due to the change in the RCUR offset from 8000 to 5000 at 1.6 sec. Disrupted violently at 0.61 sec. Appears to have gone vertically unstable. The static voltage on the EFC supply drooped to 500 V instead of its usual 700 V, which may have helped lead to the disruption. Brief pause to look at the EFC power supply. Shot 14: Try again after some changes to the EFC supply. Fizzle! Shot 15: Reduced Br0 back to -0.5 mT from 0 mT. Good shot. Shot 16: Adjusted RCUR slightly at 1.22 sec to try to keep the gap at 1.2 cm for the RF between 1.22 and 1.4 sec. LN2 leaking onto the floor in the cell from the cryostat. Good shot. Shot 17: Repeat. Good shot. Shot 18: Repeat. Good shot. Shot 19: Reduce nl04 to 7.5 x 10^19 m^-2 to try to get 8 x 10^19 m^-2. Good shot. Got 8.5 x 10^19 m^-2. Shot 20: Program nl04 to 8.5 x 10^19 m^-2 to keep it there. Enable Ar puff at 0.3 sec for 33 msec to attempt to eliminate the dithering by raising the H-mode threshold with impurities. Good shot. H-mode in rampdown driven by E port. Shot 19 without Ar got H-mode with J4 only. Shot 21: Repeat. Good shot. Shot 22: Repeat to get the last point with CII filter. Good shot. Good run! Nice H-mode at the end of the flattop and into the rampdown with J3, J4, and E port RF all together up to 2 MW peak. Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax 1 1.765 0.982 2 1.755 0.977 3 1.747 0.982 4 1.737 0.977 5 1.753 0.977 6 1.764 0.987 7 1.772 0.987 8 1.762 0.987 9 1.418 0.987 10 1.767 0.987 11 1.766 0.987 12 1.612 0.977 13 0.616 1.018 14 0.000 0.052 15 1.840 0.987 16 1.830 0.977 17 1.810 0.977 18 1.820 0.977 19 1.860 0.987 20 1.850 0.987 21 1.850 0.987 22 1.860 0.985 Finished summary for 990825 Total of 22 shots. 22 shots. 22 plasmas. 0 fizzles. 0 duds. Fizzle = gt 27.0 lt 50kA. |
| Session Leader Comments | |||
| Aug 25 1999 08:52:48:483AM | Brian Labombard | PPPL and LANL cameras synchronized this morning C2H4 test injection before run recorded as shot#6095 in edge tree | |
| Aug 25 1999 09:30:38:060AM | 990825001 | Brian Labombard | FSP/ASP scanning with C2H4 injection A2 bias setup ("deep" Mach mode, gated divertor probes) Timing slightly off on FSP scans. Next shot, repeat with deeper probes |
| Aug 25 1999 09:46:46:293AM | 990825002 | Brian Labombard | FSP/ASP scanning with C2H4 injection A2 bias setup ("deep" Mach mode, gated divertor probes) Timing is better on FSP scans. Next shot, repeat with CII filter. |
| Aug 25 1999 10:12:11:263AM | 990825003 | Brian Labombard | FSP/ASP scanning with C2H4 injection B2 bias setup ("deep" fluctuation mode, non-gated divertor probes) Nice plumes. Next shot, repeat with shallow injection, A10 bias and CIII filters. |
| Aug 25 1999 10:22:17:373AM | 990825004 | Brian Labombard | FSP/ASP scanning with C2H4 injection A10 bias setup ("shallow" Mach mode, gated divertor probes) Nice plumes Next shot, repeat with shallow injection, B10 bias and CII filters |
| Aug 25 1999 10:37:50:340AM | 990825005 | Brian Labombard | FSP/ASP scanning with C2H4 injection B10 bias setup ("shallow" fluctuation mode, non-gated divertor probes) Nice plumes Next shot, go to NL04=0.6 with shallow injection, A10 bias and CIII filters |
| Aug 25 1999 10:59:20:733AM | 990825006 | Brian Labombard | FSP/ASP scanning with C2H4 injection A10 bias setup ("shallow" Mach mode, gated divertor probes) FSP had trouble scanning! Next shot, repeat with no changes. |
| Aug 25 1999 11:17:35:920AM | 990825007 | Brian Labombard | FSP/ASP scanning with C2H4 injection A10 bias setup ("shallow" Mach mode, gated divertor probes) FSP scanned OK but CIII plumes are very weak. Next shot, repeat with increased exposure time. |
| Aug 25 1999 11:35:08:310AM | 990825008 | Brian Labombard | FSP/ASP scanning with C2H4 injection A10 bias setup ("shallow" Mach mode, gated divertor probes) OK plumes, a little weak Next shot repeat and go to B10 bias, CII filters and shallow scan. |
| Aug 25 1999 11:56:46:810AM | 990825009 | Brian Labombard | FSP/ASP scanning with C2H4 injection B10 bias setup ("shallow" fluctuation mode, non-gated divertor probes) CII plumes are ok Next shot repeat and go to A2 bias and CIII filters with deep scan |
| Aug 25 1999 12:13:51:483PM | 990825010 | Brian Labombard | FSP/ASP scanning with C2H4 injection A2 bias setup ("deep" Mach mode, gated divertor probes) CIII plumes look good Next shot repeat and go to A2 bias with CII filters with deep scan |
| Aug 25 1999 12:30:36:920PM | 990825011 | Brian Labombard | FSP/ASP scanning with C2H4 injection B10 bias setup ("shallow" fluctuation mode, non-gated divertor probes) CII plumes look good Next shot go to NL04=1.4 with A10 bias, shallow insertion, CIII filters |
| Aug 25 1999 12:50:18:293PM | 990825012 | Brian Labombard | FSP/ASP scanning with C2H4 injection A10 bias setup ("shallow" Mach mode, gated divertor probes) CIII plumes are saturated Next shot: Repeat with shorter camera exposures |
| Aug 25 1999 01:23:38:860PM | 990825013 | Brian Labombard | FSP/ASP scanning with C2H4 injection A10 bias setup ("shallow" Mach mode, gated divertor probes) First CIII plume looks good. Shot disrupted at .61 sec Next shot: Repeat |
| Aug 25 1999 02:47:08:687PM | 990825015 | Brian Labombard | FSP/ASP scanning with C2H4 injection A10 bias setup ("shallow" Mach mode, gated divertor probes) Plumes look good. Next shot: repeat, go to B10 bias, shallow injection with CII filter |
| Aug 25 1999 03:14:14:153PM | 990825016 | Brian Labombard | FSP/ASP scanning with C2H4 injection B10 bias setup ("shallow" fluctuation mode, non-gated divertor probes) Plumes look good (narrow poloidal extent) Next shot: repeat, go to A2 Bias, deep insertion, CIII filters. |
| Aug 25 1999 03:31:34:903PM | 990825017 | Brian Labombard | FSP/ASP scanning with C2H4 injection A2 bias setup ("deep" Mach mode, gated divertor probes) Small extent CIII plumes. Next shot: repeat, go to B2 bias, deep insertion, CII filters |
| Aug 25 1999 03:47:57:640PM | 990825018 | Brian Labombard | FSP/ASP scanning with C2H4 injection B2 bias setup ("deep" fluctuation mode, non-gated divertor probes) CII plumes are tiny. Next shot: go to NL04=0.85 with A10 bias, shallow insertion, CIII filters |
| Aug 25 1999 04:07:53:437PM | 990825019 | Brian Labombard | FSP/ASP scanning with C2H4 injection A10 bias setup ("shallow" Mach mode, gated divertor probes) CIII plumes look good. Dithering on third scan. Next shot: Repeat with Argon enabled, B10 bias, shallow insertion, CII filters |
| Aug 25 1999 04:23:41:983PM | 990825020 | Brian Labombard | FSP/ASP scanning with C2H4 injection B10 bias setup ("shallow" fluctuation mode, non-gated divertor probes) CII plumes are ok. Next shot: Repeat with Argon enabled, A2 bias, deep insertion, CIII filters |
| Aug 25 1999 04:57:51:090PM | 990825021 | Brian Labombard | FSP/ASP scanning with C2H4 injection A2 bias setup ("deep" Mach mode, gated divertor probes) Good CIII plumes. Next shot: Repeat with Argon enabled, B2 bias, deep injection, CII filter |
| Physics Operator Comments | |||
| Aug 25 1999 08:28:56:327AM | Joseph Snipes | Engineering setup and run plan for Wednesday 25 August 1999 MP#208/228 Plumes and SOL Transport SL: B. LaBombard and S. Gangadhara PO: J. Snipes Run will begin at 9:00AM and end at 5:00PM. For the plume studies, start with standard 1MA 5.1T plasmas (like 990824002). Run four identical shots to scan the FSP together with different carbon filters viewing the probe. Then, the density will be scanned from nl04 = 0.6 x 10^20 m^-2 to 1.4 x 10^20 m^-2 in separate series of similar shots. For the SOL Transport studies, we will use ohmic H-mode discharges like 990819001 to start with. Then, we will vary the toroidal field at the end of the H-mode to perform a TF scan in H-mode from 3 T to 6 T. We will raise or lower the current to maintain the H-mode over this range of toroidal fields staying at nearly constant q95 at the end of the H-mode to avoid low q disruptions. Engineering setup: *** Two hours of ECDC in D2 prior to the run. *** Setup power supplies from 990824002 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 6 psi of H2 Hybrid DISABLED fill C-side with 30 psi of D2 Hybrid enabled leave J-bottom as is Hybrid DISABLED The following gate valves should be enabled, assuming no vacuum problems: ECE, VUV | |
| Aug 25 1999 09:23:19:293AM | 990825001 | Joseph Snipes | Shot 1: Copied shot 990824002, then dropped nl04 from 1.1 to 1.0 x 10^20 m^-2. Reduced RCUR by 4 mm until 1.2 sec, then shifted it back out so that we should have 1.5 cm inner and outer gaps until 1.2 sec, then decrease the gap to 1 cm. Good shot! |
| Aug 25 1999 09:45:53:687AM | 990825002 | Joseph Snipes | Shot 2: Changed RCUR slightly after 1.2 sec to increase outer gap to 1.2 cm for the RF at the end of the shot. Good shot! |
| Aug 25 1999 09:57:26:577AM | 990825003 | Joseph Snipes | Shot 3: Repeat. Good shot. |
| Aug 25 1999 10:15:38:140AM | 990825004 | Joseph Snipes | Shot 4: Repeat. Good shot. |
| Aug 25 1999 10:32:47:687AM | 990825005 | Joseph Snipes | Shot 5: Repeat. Good shot. |
| Aug 25 1999 10:49:47:607AM | 990825006 | Joseph Snipes | Shot 6: Reducing nl04 to 0.6 x 10^20 m^-2. Good shot! |
| Aug 25 1999 11:15:01:467AM | 990825007 | Joseph Snipes | Shot 7: Changed nl04 to 0.7 x 10^20 m^-2 to try to ensure the same density for the next shot. Good shot. Br jumped down by 1 mT. |
| Aug 25 1999 11:21:46:263AM | 990825007 | Joseph Snipes | Shot 7: RF between 1.2 and 1.4 sec from 0.2 to 0.3 MW. H-mode during RF becoming EDA in the rampdown. |
| Aug 25 1999 11:51:49:200AM | 990825008 | Joseph Snipes | Shot 8: Increased Br0 by 0.5 mT to 0 mT. Good shot. Again, RF H-mode at the end of the shot. |
| Aug 25 1999 11:52:57:670AM | 990825009 | Joseph Snipes | Shot 9: Repeat. Good shot. Disrupted at 1.4 sec due to a large impurity injection just as the RF shuts off in H-mode. |
| Aug 25 1999 12:10:35:107PM | 990825010 | Joseph Snipes | Shot 10: Repeat without RF. Good shot. Spectroscopy tree corrupted. No spectroscopy data for this shot! |
| Aug 25 1999 12:30:32:983PM | 990825011 | Joseph Snipes | Shot 11: Repeat. Good shot. |
| Aug 25 1999 12:47:33:560PM | 990825012 | Joseph Snipes | Shot 12: Raising nl04 to 1.4 x 10^20 m^-2. Good shot. Achieved 1.3 x 10^20 m^-2. |
| Aug 25 1999 01:28:10:013PM | 990825013 | Joseph Snipes | Shot 13: Reduced nl04 to 1.3 x 10^20 m^-3 to try to keep the density there. Kept RCUR out at 0.669 m after 1.4 sec to try to avoid the disruption at 1.6 sec. It may also be due to the change in the RCUR offset from 8000 to 5000 at 1.6 sec. Disrupted violently at 0.61 sec. Appears to have gone vertically unstable. |
| Aug 25 1999 01:45:24:903PM | 990825013 | Joseph Snipes | Shot 13: The static voltage on the EFC supply drooped to 500 V instead of its usual 700 V, which may have helped lead to the disruption. Brief pause to look at the EFC power supply. |
| Aug 25 1999 02:31:11:640PM | 990825014 | Joseph Snipes | Shot 14: Try again after some changes to the EFC supply. Fizzle! |
| Aug 25 1999 02:45:34:060PM | 990825015 | Joseph Snipes | Shot 15: Reduced Br0 back to -0.5 mT from 0 mT. Good shot. |
| Aug 25 1999 03:04:06:513PM | 990825016 | Joseph Snipes | Shot 16: Adjusted RCUR slightly at 1.22 sec to try to keep the gap at 1.2 cm for the RF between 1.22 and 1.4 sec. LN2 leaking onto the floor in the cell from the cryostat. Good shot. |
| Aug 25 1999 03:23:41:747PM | 990825017 | Joseph Snipes | Shot 17: Repeat. Good shot. |
| Aug 25 1999 03:43:52:090PM | 990825018 | Joseph Snipes | Shot 18: Repeat. Good shot. |
| Aug 25 1999 04:07:17:453PM | 990825019 | Joseph Snipes | Shot 19: Reduce nl04 to 7.5 x 10^19 m^-2 to try to get 8 x 10^19 m^-2. Good shot. Got 8.5 x 10^19 m^-2. |
| Aug 25 1999 04:31:00:310PM | 990825020 | Joseph Snipes | Shot 20: Program nl04 to 8.5 x 10^19 m^-2 to keep it there. Enable Ar puff at 0.3 sec for 33 msec to attempt to eliminate the dithering by raising the H-mode threshold with impurities. Good shot. H-mode in rampdown driven by E port. Shot 19 without Ar got H-mode with J4 only. |
| Aug 25 1999 04:53:20:263PM | 990825021 | Joseph Snipes | Shot 21: Repeat. Good shot. |
| Aug 25 1999 05:10:09:687PM | 990825022 | Joseph Snipes | Shot 22: Repeat to get the last point with CII filter. Good shot. Good run! |
| Aug 25 1999 05:14:10:420PM | 990825022 | Joseph Snipes | Shot 22: Nice H-mode at the end of the flattop and into the rampdown with J3, J4, and E port RF all together up to 2 MW peak. |
| Aug 25 1999 05:16:59:293PM | 990825022 | Joseph Snipes | Shot,Duration(s),Ipmax(MA) Shot,Duration(s),Ipmax 1 1.765 0.982 2 1.755 0.977 3 1.747 0.982 4 1.737 0.977 5 1.753 0.977 6 1.764 0.987 7 1.772 0.987 8 1.762 0.987 9 1.418 0.987 10 1.767 0.987 11 1.766 0.987 12 1.612 0.977 13 0.616 1.018 14 0.000 0.052 15 1.840 0.987 16 1.830 0.977 17 1.810 0.977 18 1.820 0.977 19 1.860 0.987 20 1.850 0.987 21 1.850 0.987 22 1.860 0.985 Finished summary for 990825 Total of 22 shots. 22 shots. 22 plasmas. 0 fizzles. 0 duds. Fizzle = gt 27.0 lt 50kA. To print to file: unit=2; openw,unit,'file',/stream; .run summary; close,unit To plot currents, set iplot=1. Adjust ncols, nrows if nec. |
| Aug 25 1999 05:30:27:687PM | 990825022 | Joseph Snipes | Summary: It was a very good run. The machine ran very well with only a slight delay to investigate an intermittent problem with EFC whereby the static voltage reached only 700 V and drooped to 500 V instead of reaching 1000 V and drooping to 700 V as it usually does. The problem went away on the next shot. Only the MP 208 Plume studies was accomplished because it really was asking too much to do two mini-proposals in one day. With 4 good shots required for shallow and deep probe insertion with CII and CIII filters and proper camera exposure, we were able to scan 4 different densities and got good data for all conditions. The current scan was not attempted in favor of an intermediate density point. The RF also managed to get in some conditioning late in the discharge and they were able to get into H-mode with low power on both E and J port antennas. On the last shot, the RF managed to combine J3, J4, and E port antennas to reach 2 MW peak and got a nice H-mode at the end of the discharge. Some fluctuations were observed on the PCI and reflectometer that appear to be at the same frequency during H-mode. They were not present on the magnetics. Of 22 shots, only one was a fizzle (though not by Ian's program, see below), which was probably due to overcooling because of a one hour delay to check out the EFC power supply. One shot disrupted at 0.6 sec perhaps due to the EFC problem. The other 20 shots were full length 1 MA plasmas many of which ramped down past 1.8 sec due to a change in RCUR in the rampdown. |
| Aug 26 1999 12:19:00:763PM | 990825022 | Ron Parker | SHOT 990826001 SHOT WAS PROGRAMMED TO REPRODUCE SHOT 990824002, WHICH IT DID. THERE WAS NO RF ON THIS SHOT. RF CONDITIONING WILL BEGIN ON NEXT SHOT. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:20:54:513AM | Plasma | Ok | (null) |
| 2 | 09:38:31:513AM | Plasma | Ok | (null) |
| 3 | 09:55:52:297AM | Plasma | Ok | (null) |
| 4 | 10:13:49:747AM | Plasma | Ok | (null) |
| 5 | 10:31:12:967AM | Plasma | Ok | (null) |
| 6 | 10:48:07:640AM | Plasma | Ok | (null) |
| 7 | 11:10:35:967AM | Plasma | Ok | (null) |
| 8 | 11:28:32:827AM | Plasma | Ok | (null) |
| 9 | 11:47:27:623AM | Plasma | Ok | (null) |
| 10 | 12:05:00:840PM | Plasma | Ok | (null) |
| 11 | 12:24:18:717PM | Plasma | Ok | (null) |
| 12 | 12:41:46:263PM | Plasma | Ok | (null) |
| 13 | 01:13:46:653PM | Plasma | Ok | (null) |
| 14 | 02:23:39:420PM | Plasma | Ok | (null) |
| 15 | 02:40:56:157PM | Plasma | Ok | (null) |
| 16 | 03:02:41:810PM | Plasma | Ok | (null) |
| 17 | 03:21:32:950PM | Plasma | Ok | (null) |
| 18 | 03:41:59:060PM | Plasma | Ok | (null) |
| 19 | 04:00:10:030PM | Plasma | Ok | (null) |
| 20 | 04:18:42:857PM | Plasma | Ok | (null) |
| 21 | 04:49:54:657PM | Plasma | Ok | (null) |
| 22 | 05:05:42:793PM | Plasma | Ok | (null) |