| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Yijun Lin |
| Physics operator(s): | Joseph Snipes |
| Engineering operator(s): | Unknown |
| Engineering Operator Run Comment |
| MP# 343A And MP# 345,MC Flow Drive/Current Drive at 8T. Lin/Parisot/Snip |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:05:070PM |
| Author: Yijun Lin |
| 1040427: MP343A and MP345 Purpose: MP#343A and MP 345, MC flow drive/current drive at 8 T. SL: Lin/Parisot PO: Snipes ------------------- Run Plan: Start with 1040423002, 5.4 T. After tests load 1040423017, nl04~0.75e20 m^-2 for 8T operation. 1. Scan He3 puff/density until a good MC target is obtained (PCI may provide a definite answer). Using moderate RF power (<= 3.5 MW). Ip = 1.2 MA, BT~7.9 T. We will avoid H-mode. J-port power will be modulated. 2. Repeat the plasma, and scan HIREX viewing location shot by shot to search rf correlated flow. 3. Change J-antenna phase and monitor current drive. Measurements from MSE will be important. 4. If time permits, do field/density/current scan for both flow drive and current drive. Run summary: (maybe it is the run day with the most 8T plasma shots.) In most plasma shots, the PCI detected mode converted wave(s). In some shot, perhaps both MC IBW and MC ICW were observed. The current setup of PCI does not have enough spatial resolution to resolve IBW. The observed waves at k_R at -(3-5) /cm may be an aliased IBW signal at k_R about 2*k_Nyquist -(3-5) ~ 11-13/cm. The other wave observed had k_R near the Nyquist k about 8/cm, which is believed to be an ICW on the LFS of the IBW. The mode conversion layer and structure seen from the PCI was moving in directions as expected with B field, He3 level, etc. The signal level of the MC ICW appeared to be affected by the distance of the MC layer to the magnetic axis (B_pol effect). More analysis is underway. By setting the HIREX viewing chords around the mode conversion layer location, we tried to look for flow driven by the MC waves. While the RF power is modulated, there is no obvious modulated poloidal flow seen in HIREX measurement under any conditions we tried. I suspect that the flow, if any, is below the sensitivity/uncertainty of the HIREX measurement. More analysis is still underway. We also ran plasmas with low density and phased antenna for MCCD study. There were some data from MSE with/without RF. More analysis is underway. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:50:113PM |
| Author: Joseph Snipes |
| Purpose: MP#343A and MP 345, MC flow drive/current drive at 8 T. SL: Lin/Parisot PO: Snipes Overnight ECDC in D2 at 2e-4 Torr Run begins at 08:00 and ends at 20:00. Power systems the same as 1040423017 for 8 T plasmas 1040423002 for 5.4 T plasmas Needs B-side upper with 15 PSI He3. Needs A-coils Diagnostics: GPC2 set for 8 T, TCI, FRECE (5.4 T discharge) McPherson/Chromex to monitor He3 PCI for MC waves MSE from DNB for current profile HIREX and HIREX jr for flow ---------------------------------------------------------------------------- RF Setup: All four transmitters in RUN-ON by 07:00 AM ---------------------------------------------------------------------------- Run Plan: Start with 1040423002, 5.4 T. After tests load 1040423017, nl04~0.75e20 m^-2 for 8T operation. 1. Scan He3 puff/density until a good MC target is obtained (PCI may provide a definite answer). Using moderate RF power (<= 3.5 MW). Ip = 1.2 MA, BT~7.9 T. J-port power will be modulated. 2. Repeat the plasma, and scan HIREX viewing location shot by shot to search rf correlated flow. 3. Change J-antenna phase and monitor current drive. Measurements from MSE will be important. 4. If time permits, do field/density/current scan for both flow drive and current drive. Summary: The machine ran rather well with only a few minor delays given that there were at least 20 minutes or more between shots for cooling at 8 T. There were 28 shots, one TF test, one shot with no EF4 because of operator error, and one fizzle. There were then 25 plasmas, 4 of which disrupted. Two disruptions were due to density feedback failure. The other two disruptions were apparently induced by impurity injection during the RF, though it is not clear if the RF generated the impurities. The others ramped down nicely. Mode conversion was observed though the flow drive was not. See the session leader's summary for more details. Shot 1: TF test with EF1. Shot 2: Copied shot 1040423002 at 5.4 T, 1 MA. Good shot. Shot 3: Copied shot 1040423017. He3 puff from 0.3 to 0.468 s on Pulse Gas 2 as in the copied shot. TF current set to 219 kA. Good shot. Shot 4: Increased Ar puff from 40 to 60 ms duration. Good shot. Shot 5: Increased Ar puff from 60 to 80 ms duration. Disrupted at 1.39 s. Density feedback failed at the start of the pulse so gas was full on. Shot 6: Increased Ar puff from 80 to 100 ms duration. Good shot. Shot 7: Decreased TF current to 213.7 kA to go to 7.7 T. Good shot. Shot 8: Increased TF current to 223.4 kA to go to 8.05 T. Good shot. Shot 9: Decreased TF current back to 219 kA. Decreased He3 puff to 100 ms duration. Good shot. Shot 10: Decreased He3 puff to 50 ms duration. Good shot. Shot 11: Increased He3 puff to 200 ms duration. No EF4. No plasma. Shot 12: Repeat with EF4. Good shot. Shot 13: Repeat. Good shot. Shot 14: Repeat. Good shot. Shot 15: Repeat. Good shot. Shot 16: Repeat. Disrupted at 1.19 s. Shot 17: Reduced He3 puff to 180 ms duration. Good shot. Shot 18: Repeat. Good shot. Shot 19: Repeat. Disrupted at 0.927 s. Shot 20: Repeat. Fizzle! Shot 21: Reduced EF4 current by 10 A from -1315 A to -1325 A. Good shot. Shot 22: Reduced nl04 to 6 x 10^19 m^-2. Reduced He3 puff to 150 ms duration. Good shot. Shot 23: Repeat. Good shot, but there were lots of runaways early. Shot 24: Raised Pulse Gas 3 between 0.053 and 0.1 s from 35 V to 100 V to try to eliminate the runaways. Good shot, but the runaways were not reduced. Shot 25: Increased prepuff by 2 ms to 21 ms duration to attempt to eliminate the runaways. Good shot. Runaways were reduced a bit, but are still present. Shot 26: Increased prepuff by 2 ms to 23 ms duration to attempt to eliminate the runaways. Good shot. Shot 27: Repeat. Good shot. Shot 28: Repeat. Disrupted at 1.09 s due to density feedback failure. |
| Session Leader Comments | |||
| Apr 28 2004 09:24:25:380AM | Yijun Lin | Run summary: In most plasma shots, the PCI detected mode converted wave(s). In some shot, perhaps both MC IBW and MC ICW were observed. The current setup of PCI does not have enough max-k to resolve IBW, and the observed waves at k_R at -(3-5) /cm may be an aliased IBW signal. The other wave observed had k_R near the Niquist k about 8/cm, which is believed to be an ICW on the LFS of the IBW. The mode conversion layer and structure seen from the PCI was moving in directions as expected with B field, He3 level, etc. The signal level of the MC ICW seems also to be affected by the distance of the MC layer to the magnetic axis (B_pol effect). More analysis is underway. By setting the HIREX viewing chords around the mode conversion layer location, we tried to look for flow driven by the MC waves. While the RF power is modulated, there is no obvious poloidal flow seen in HIREX measurement under any conditions we tried. I suspect that the flow, if any, is below the sensitivity/uncertainty of the HIREX measurement. More analysis is still underway. We also ran plasmas with low density and phased antenna for MCCD study. There were some data from MSE with/without RF. More analysis is underway. | |
| Apr 27 2004 07:58:40:827AM | 1040427001 | Yijun Lin | shot 01: Power supply test. (50 kA TF test) |
| Apr 27 2004 08:45:05:963AM | 1040427003 | Yijun Lin | shot 03: Load shot 1040423017. Bt = 7.9 Telsa, Ip = 1.2 MA, nl04 = 0.75 e20m^-2 D: 0.4 MW, [.6, 1.2] sec. E: .8 MW [.6,1.2] sec J: 2.2 MW [0.6,1.2] sec. Digital phase +152, [0, pi, pi, 0] Modulated. 60 ms on, 60 ms off. He3 puff 170 ms. DNB [0.8-0.85] sec HIREX at R ~ 0.66 m Result: plasma. full length. Several H-modes. No signal from HIREX. PCI saw MC wave in ch 16, 17, 18. Next: run only J port to avoid H-mode. Same He3. More argon next shot. |
| Apr 27 2004 09:11:48:743AM | 1040427004 | Yijun Lin | shot 04: Bt = 7.9 Telsa, Ip = 1.2 MA, nl04 = 0.75 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase +152, [0, pi, pi, 0] Modulated. 60 ms on, 60 ms off. He3 puff 170 ms. DNB [0.8-0.85] sec HIREX at R ~ 0.66 m Result: plasma. full length. L-mode Slight density increase with J-power. PCI saw MC wave in ch 16, 17, 18. and also in chan 1-13. Possibly two peaks (IBW/ICW) in k-spectrum. (suspect the MC layer at PCI ch 14-15 location) More argon next shot. |
| Apr 27 2004 09:44:52:593AM | 1040427005 | Yijun Lin | shot 05: Bt = 7.9 Telsa, Ip = 1.2 MA, nl04 = 0.75 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase +152, [0, pi, pi, 0] Modulated. 60 ms on, 60 ms off. He3 puff 170 ms. DNB [0.8-0.85] sec HIREX at R ~ 0.66 m Result: plasma. disruption caused by TCI failure. |
| Apr 27 2004 10:46:24:953AM | 1040427007 | Yijun Lin | shot 07: Bt = 7.7 Telsa, Ip = 1.2 MA, nl04 = 0.75 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase +152, [0, pi, pi, 0] Modulated. 60 ms on, 60 ms off. He3 puff 170 ms. DNB [0.8-0.85] sec HIREX at R ~ 0.66 m result: plasma, full length. L-mode. PCI signal peaks at ch 1. Aother peak at ch 14-18. Near zero at ch 10. (PCI structure is moving with the B field. Perfect. The mode conversion is real!) Next: 8.05 Tesla |
| Apr 29 2004 02:19:35:530PM | 1040427008 | Yijun Lin | shot 08: Bt = 8.03 Tesla, Ip = 1.2 MA, nl04 = 0.75 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase +152, [0, pi, pi, 0] Modulated. 60 ms on, 60 ms off. He3 puff 170 ms. DNB [0.8-0.85] sec HIREX at R ~ 0.66 m result: plasma, full length. L-mode. PCI signal peaks at ch 10 as expected. No 2nd peak seen. (It is likely that the 2nd peak is ICW peak, which may become much weak when the MC layer is too close to the axis). But I need more test. Possible poloidal flow? Next: 7.9 T, reduce He3 puff to 100 ms to see whether there is another peak on the higher field. |
| Apr 29 2004 02:19:56:953PM | 1040427009 | Yijun Lin | shot 09: Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.75 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase +152, [0, pi, pi, 0] Modulated. 60 ms on, 60 ms off. He3 puff 100 ms. DNB [0.8-0.85] sec HIREX at R ~ 0.66 m Result: plasma, full length. L-mode. PCI signal still peaks at CH 6, same as shot 6. but the width is narrower. Next: modulate RF at 100 ms on, 100 ms off to get better timing for HIREX. Lower He3 down to 50 ms. |
| Apr 27 2004 12:14:18:963PM | 1040427010 | Yijun Lin | shot 10: Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.75 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase +152, [0, pi, pi, 0] Modulated. 100 ms on, 100 ms off. He3 puff 50 ms. DNB [0.8-0.85] sec HIREX at R ~ 0.66 m Result: plasma, full length. L-mode. PCI signal peaks at Ch 9. It moves closer to the axis. No 2nd peak is distinguishable. Next: Raise He3 puff to 200 ms. |
| Apr 27 2004 12:27:05:423PM | 1040427011 | Yijun Lin | shot 11: dud. No EF4. |
| Apr 27 2004 01:23:34:363PM | 1040427012 | Yijun Lin | shot 12: Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.75 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase +152, [0, pi, pi, 0] Modulated. 100 ms on, 100 ms off. He3 puff 200 ms. DNB [0.8-0.85] sec HIREX at R ~ 0.66 m Result: plasma, full length. L-mode. PCI signal peaks from ch1 - ch10. No flow in Hirex plus/minus 4 cm vertically Next: move the HIREX view to plus/minus 2 cm vertically. Same plasma. |
| Apr 27 2004 01:23:53:863PM | 1040427013 | Yijun Lin | shot 13: Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.75 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase +152, [0, pi, pi, 0] Modulated. 100 ms on, 100 ms off. He3 puff 200 ms. DNB [0.8-0.85] sec HIREX at R ~ 0.67 m Result: plasma, full length. L-mode. PCI signal peaks from ch2 - ch8. Still nothing in HIREX. View at plus/minus 3 cm Next: move the HIREX view to plus/minus 5 cm vertically. Same plasma. |
| Apr 27 2004 01:46:18:970PM | 1040427014 | Yijun Lin | shot 14: Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.75 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase +152, [0, pi, pi, 0] Modulated. 100 ms on, 100 ms off. He3 puff 200 ms. DNB [0.8-0.85] sec HIREX at R ~ 0.67 m Result: plasma, full length. L-mode. PCI signal peaks from ch2 - ch8. Still nothing in HIREX. View at plus/minus 5 cm Next: move the HIREX view to plus/minus 5 cm vertically. Same plasma. PCI very similar to shot 13. Still no flow. Next view at plus/minus 4 cm. |
| Apr 27 2004 02:08:35:780PM | 1040427015 | Yijun Lin | shot 15: Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.75 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase +152, [0, pi, pi, 0] Modulated. 100 ms on, 100 ms off. He3 puff 200 ms. DNB [0.8-0.85] sec HIREX at R ~ 0.67 m Result: plasma, full length. L-mode. PCI signal peaks from ch2 - ch8. Still nothing in HIREX. View at plus/minus 4 cm Next: move the HIREX view to plus/minus 5 cm vertically. Same plasma. PCI very similar to shot 13. Still no flow. Next: phase antenna at digital phase 230. |
| Apr 27 2004 03:03:52:190PM | 1040427016 | Yijun Lin | shot 16: Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.75 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase 230, [0, pi/2, pi, 3/2pi] phase Modulated. 100 ms on, 100 ms off. He3 puff 200 ms. DNB [0.8-0.85] sec HIREX at R ~ 0.67 m Result: plasma, disrupted 1.12 sec. PCI signal peaks from ch1 - ch8. Still nothing in HIREX. View at plus/minus 4 cm Next: repeat. He3 puff at 180 ms. tune RF. |
| Apr 27 2004 03:33:34:480PM | 1040427017 | Yijun Lin | shot 17: Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.75 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase 230, [0, pi/2, pi, 3/2pi] phase Modulated. 100 ms on, 100 ms off. He3 puff 180 ms. DNB [0.8-0.85] sec HIREX at R ~ 0.67 m Result: Plasma full length. RF tripped. HIREX #2 HV tripped. Only #4 data. Inconlusive. PCI saw two peaks, ch1 and ch5. Are there two waves? Next: repeat to get better HIREX data. |
| Apr 27 2004 03:56:58:290PM | 1040427018 | Yijun Lin | shot 18: Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.75 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase 230, [0, pi/2, pi, 3/2pi] phase Modulated. 100 ms on, 100 ms off. He3 puff 180 ms. DNB [0.8-0.85] sec HIREX at R ~ 0.67 m Result: Plasma full length. RF tripped. Both #2 and #4 data. Inconclusive. PCI saw two peaks, ch1 and ch5. Are there two waves? Next: repeat to get better HIREX data. Slightly change RF modulation timing. |
| Apr 27 2004 04:27:35:470PM | 1040427019 | Yijun Lin | shot 19: Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.75 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase 230, [0, pi/2, pi, 3/2pi] phase Modulated. 100 ms on, 100 ms off. He3 puff 180 ms. DNB [0.8-0.85] sec HIREX at R ~ 0.67 m Result: Plasma. Disrupted 0.92 sec. Both #2 and #4 data. Still no flow. PCI saw two peaks, ch1 and ch4. Next: CHange antenna phasing to -pi/2. Digital phase at 50. |
| Apr 27 2004 04:59:40:960PM | 1040427020 | Yijun Lin | fizzle |
| Apr 27 2004 05:26:50:113PM | 1040427021 | Yijun Lin | shot 21: Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.75 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase 50, [0, -pi/2, -pi, -3/2pi] phase Modulated. 100 ms on, 100 ms off. He3 puff 180 ms. DNB [0.8-0.85] sec HIREX at R ~ 0.67 m Result: Plasma. full length Next: Lower density. Also to see whether it helps DNB. Lower He3 to 150 ms. |
| Apr 27 2004 05:50:39:927PM | 1040427022 | Yijun Lin | shot 22: for MCCD Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.6 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase 50, [0, -pi/2, -pi, -3/2pi] phase Modulated. 100 ms on, 100 ms off. He3 puff 150 ms. DNB [1.1-1.15] sec, didn't fire HIREX at R ~ 0.67 m Result: Plasma. full length PCI peak ch1-ch8. HIREX tripped out. No data Next: repeat. |
| Apr 27 2004 06:16:23:473PM | 1040427023 | Yijun Lin | shot 23: for MCCD Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.6 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase 50, [0, -pi/2, -pi, -3/2pi] phase Modulated. 100 ms on, 100 ms off. He3 puff 150 ms. DNB [1.1-1.15] sec HIREX at R ~ 0.66 m Result: Plasma. full length HIREX tripped out. PC signal similar to shot 22. MSE data too noisy. |
| Apr 27 2004 07:12:19:020PM | 1040427024 | Yijun Lin | shot 24: for MCCD Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.6 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase 50, [0, -pi/2, -pi, -3/2pi] phase Modulated. 100 ms on, 100 ms off. He3 puff 150 ms. DNB [1.1-1.15] sec HIREX at R ~ 0.67 m Result: Plasma. full length MSE signals were better. HIREX tripped out at 0.7 sec. Flow? unclear. PCI saw two peaks. one at ch9 another at ch 17. Next: reload shot 23. |
| Apr 27 2004 07:12:35:617PM | 1040427025 | Yijun Lin | shot 25: for MCCD, reload shot 23 Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.6 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase 50, [0, -pi/2, -pi, -3/2pi] phase Modulated. 100 ms on, 100 ms off. He3 puff 150 ms. DNB [1.1-1.15] sec HIREX at R ~ 0.67 m Result: Plasma. full length Hirex at +/- 5 cm. No flow. PCI has two peaks ch6 and ch18 with two different k-numbers. Next: digital phase 230, same RF. HIREX view +/- 6cm |
| Apr 27 2004 07:26:03:020PM | 1040427026 | Yijun Lin | shot 26: for MCCD Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.6 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase 230, [0, pi/2, pi, 3/2pi] phase Modulated. 100 ms on, 100 ms off. He3 puff 150 ms. DNB [1.1-1.15] sec HIREX view +/- 6cm Result: Plasma. full length Flow? might be. Next: repeat. But no RF at Beam time. |
| Apr 27 2004 07:48:40:007PM | 1040427027 | Yijun Lin | shot 27: Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.6 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase 230, [0, pi/2, pi, 3/2pi] phase Modulated. 100 ms on, 100 ms off. He3 puff 150 ms. DNB [1.1-1.15] sec HIREX view +/- 6cm Result: Plasma. full length Flow? not at all. Next: repeat shot 26. Hirec view at +/- 3 cm. |
| Apr 27 2004 08:07:04:600PM | 1040427028 | Yijun Lin | shot 28: Bt = 7.9 Tesla, Ip = 1.2 MA, nl04 = 0.6 e20m^-2 J: 2.5 MW, [0.6,1.2] sec. Digital phase 230, [0, pi/2, pi, 3/2pi] phase Modulated. 100 ms on, 100 ms off. He3 puff 150 ms. DNB [1.1-1.15] sec HIREX view +/- 3cm Result: Plasma. full length. Flow, not. |
| Physics Operator Comments | |||
| Apr 27 2004 07:57:16:813AM | Joseph Snipes | Purpose: MP#343A and MP 345, MC flow drive/current drive at 8 T. SL: Lin/Parisot PO: Snipes Overnight ECDC in D2 at 2e-4 Torr Run begins at 08:00 and ends at 20:00. Power systems the same as 1040423017 for 8 T plasmas 1040423002 for 5.4 T plasmas Needs B-side upper with 15 PSI He3. Needs A-coils Diagnostics: GPC2 set for 8 T, TCI, FRECE (5.4 T discharge) McPherson/Chromex to monitor He3 PCI for MC waves MSE from DNB for current profile HIREX and HIREX jr for flow ---------------------------------------------------------------------------- RF Setup: All four transmitters in RUN-ON by 07:00 AM ---------------------------------------------------------------------------- Run Plan: Start with 1040423002, 5.4 T. After tests load 1040423017, nl04~0.75e20 m^-2 for 8T operation. 1. Scan He3 puff/density until a good MC target is obtained (PCI may provide a definite answer). Using moderate RF power (<= 3.5 MW). Ip = 1.2 MA, BT~7.9 T. J-port power will be modulated. 2. Repeat the plasma, and scan HIREX viewing location shot by shot to search rf correlated flow. 3. Change J-antenna phase and monitor current drive. Measurements from MSE will be important. 4. If time permits, do field/density/current scan for both flow drive and current drive. | |
| Apr 27 2004 07:59:02:467AM | 1040427001 | Joseph Snipes | Shot 1: TF test with EF1. |
| Apr 27 2004 08:13:48:380AM | 1040427002 | Joseph Snipes | Shot 2: Copied shot 1040423002 at 5.4 T, 1 MA. Good shot. |
| Apr 27 2004 08:30:58:223AM | 1040427003 | Joseph Snipes | Shot 3: Copied shot 1040423017. He3 puff from 0.3 to 0.468 s on Pulse Gas 2 as in the copied shot. TF current set to 219 kA. Good shot. |
| Apr 27 2004 08:58:00:287AM | 1040427004 | Joseph Snipes | Shot 4: Increased Ar puff from 40 to 60 ms duration. Good shot. |
| Apr 27 2004 09:25:07:203AM | 1040427005 | Joseph Snipes | Shot 5: Increased Ar puff from 60 to 80 ms duration. Disrupted at 1.39 s. Density feedback failed at the start of the pulse so gas was full on. |
| Apr 27 2004 10:14:28:650AM | 1040427006 | Joseph Snipes | Shot 6: Increased Ar puff from 80 to 100 ms duration. Good shot. |
| Apr 27 2004 10:31:43:777AM | 1040427007 | Joseph Snipes | Shot 7: Decreased TF current to 213.7 kA to go to 7.7 T. Good shot. |
| Apr 27 2004 11:43:08:360AM | 1040427009 | Joseph Snipes | Shot 9: Decreased TF current back to 219 kA. Decreased He3 puff to 100 ms duration. Good shot. |
| Apr 27 2004 12:04:39:190PM | 1040427010 | Joseph Snipes | Shot 10: Decreased He3 puff to 50 ms duration. Good shot. |
| Apr 27 2004 12:27:51:953PM | 1040427011 | Joseph Snipes | Shot 11: Increased He3 puff to 200 ms duration. No EF4. No plasma. |
| Apr 27 2004 12:49:35:937PM | 1040427012 | Joseph Snipes | Shot 12: Repeat with EF4. Good shot. |
| Apr 27 2004 01:12:00:200PM | 1040427013 | Joseph Snipes | Shot 13: Repeat. Good shot. |
| Apr 27 2004 01:58:03:103PM | 1040427014 | Joseph Snipes | Shot 14: Repeat. Good shot. |
| Apr 27 2004 01:58:19:633PM | 1040427015 | Joseph Snipes | Shot 15: Repeat. Good shot. |
| Apr 27 2004 02:33:10:310PM | 1040427016 | Joseph Snipes | Shot 16: Repeat. Disrupted at 1.19 s. RF phasing was changed for this shot. |
| Apr 27 2004 03:16:42:963PM | 1040427017 | Joseph Snipes | Shot 17: Reduced He3 puff to 180 ms duration. Good shot. |
| Apr 27 2004 03:42:07:850PM | 1040427018 | Joseph Snipes | Shot 18: Repeat. Good shot. |
| Apr 27 2004 04:18:51:620PM | 1040427019 | Joseph Snipes | Shot 19: Repeat. Disrupted at 0.927 s. |
| Apr 27 2004 04:48:19:550PM | 1040427020 | Joseph Snipes | Shot 20: Repeat. Fizzle! |
| Apr 27 2004 05:17:54:380PM | 1040427021 | Joseph Snipes | Shot 21: Reduced EF4 current by 10 A from -1315 A to -1325 A. Good shot. |
| Apr 27 2004 05:45:29:303PM | 1040427022 | Joseph Snipes | Shot 22: Reduced nl04 to 6 x 10^19 m^-2. Reduced He3 puff to 150 ms duration. Good shot. |
| Apr 27 2004 06:16:18:693PM | 1040427023 | Joseph Snipes | Shot 23: Repeat. Good shot, but there were lots of runaways early. |
| Apr 27 2004 06:37:21:303PM | 1040427024 | Joseph Snipes | Shot 24: Raised Pulse Gas 3 between 0.053 and 0.1 s from 35 V to 100 V to try to eliminate the runaways. Good shot, but the runaways were not reduced. |
| Apr 27 2004 07:05:36:473PM | 1040427025 | Joseph Snipes | Shot 25: Increased prepuff by 2 ms to 21 ms duration to attempt to eliminate the runaways. Good shot. Runaways were reduced a bit, but are still present. |
| Apr 27 2004 07:39:52:677PM | 1040427026 | Joseph Snipes | Shot 26: Increased prepuff by 2 ms to 23 ms duration to attempt to eliminate the runaways. Good shot. |
| Apr 27 2004 07:40:53:850PM | 1040427027 | Joseph Snipes | Shot 27: Repeat. Good shot. |
| Apr 27 2004 08:05:23:693PM | 1040427028 | Joseph Snipes | Shot 28: Repeat. Disrupted at 1.09 s due to density feedback failure. |
| Apr 27 2004 08:06:19:270PM | 1040427028 | Joseph Snipes | Summary: The machine ran rather well with only a few minor delays given that there were at least 20 minutes or more between shots for cooling at 8 T. There were 28 shots, one TF test, one shot with no EF4 because of operator error, and one fizzle. There were then 25 plasmas, 4 of which disrupted. Two disruptions were due to density feedback failure. The other two disruptions were apparently induced by impurity injection during the RF, though it is not clear if the RF generated the impurities. The others ramped down nicely. Mode conversion was observed though the flow drive was not. See the session leader's summary for more details. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 07:57:49:547AM | Test | Ok | |
| 2 | 08:10:32:973AM | Plasma | Ok | |
| 3 | 08:29:02:130AM | Plasma | Ok | |
| 4 | 08:54:45:490AM | Plasma | Ok | |
| 5 | 09:21:21:580AM | Plasma | Ok | |
| 6 | 09:56:32:913AM | Plasma | Ok | |
| 7 | 10:29:46:823AM | Plasma | Ok | |
| 8 | 11:07:53:263AM | Plasma | Bad | TF IOC Late After 4S |
| 9 | 11:37:56:770AM | Plasma | Ok | |
| 10 | 12:00:57:083PM | Plasma | Ok | |
| 11 | 12:24:43:173PM | Plasma | Bad | EF4 Was Not Enabled |
| 12 | 12:47:33:017PM | Plasma | Ok | |
| 13 | 01:10:19:467PM | Plasma | Ok | |
| 14 | 01:33:19:277PM | Plasma | Ok | |
| 15 | 01:56:07:883PM | Plasma | Ok | |
| 16 | 02:19:16:680PM | Plasma | Bad | TF type 1 flt |
| 17 | 03:15:10:463PM | Plasma | Ok | |
| 18 | 03:38:21:540PM | Plasma | Ok | |
| 19 | 04:16:32:090PM | Plasma | Ok | |
| 20 | 04:45:56:833PM | Plasma | Ok | |
| 21 | 05:15:29:863PM | Plasma | Ok | |
| 22 | 05:42:16:660PM | Plasma | Ok | |
| 23 | 06:05:00:693PM | Plasma | Ok | |
| 24 | 06:28:58:820PM | Plasma | Ok | |
| 25 | 06:51:35:100PM | Plasma | Ok | |
| 26 | 07:15:02:723PM | Plasma | Ok | |
| 27 | 07:37:45:007PM | Plasma | Ok | |
| 28 | 08:00:17:380PM | Plasma | Ok | |