| Miniproposals | ||||||||||
|
| Operators | |
| Session leader(s): | Catherine Fiore |
| Physics operator(s): | Joseph Snipes |
| Engineering operator(s): | Gary Dekow |
| Engineering Operator Run Comment |
| MP#374 ITB dependence on triangularity SL:Fiore/Rice; PO:Snipes; EO:Deko |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:35:447PM |
| Author: Catherine Fiore |
| Session Leader Run Plan: MP 374 ITB dependence on triangularity Session Leader Fiore/Rice Phys. Op.: Snipes The purpose of this experiment is to explore the influence of the plasma triangularity on the ITB quality, and specifically to see if obtaining an ITB is easier, and if higher densities and better confinement can be achieved. Reproduce ITB from 1021010004 (1-5 shots) How we proceed depends on whether we can successfully make ITBs. From the triangularity settings of that shot, scan up in delta_lower (0.1 increments up to 0.75, 5-8 shots) Repeat for delta_upper holding delta_lower constant. If a good high triangularity ITB has been established, scan target density to optimize ITB. It was noted from yesterday's run that radiation levels were quite high. We believe that excess radiation kept us from successfully completing this run on 12/2. If we can not establish an ITB this morning, we will probably pass this run to another MP. ---------------------------------------------------------------------------- Overall, a highly successful run. Most shots have one or more ITBs, and we achieved at least some examples at most of the triangularity conditions we ran, including double null operation. We were able to obtain ITBs at up to 3MW in double null operation. We demonstrated that we can still get ITBs, and we demonstrated that we can get them fairly reliably by means of controlling the radiated power. It appeared that it was easier to get them with higher lower triangularity, although full analysis of the data should clarify this. ITBs were present on shots 4, 5, 6,9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20,21, 22, 23, 27, 28, 29, 30,31,33, 34, 35 1031212001 This was a no power shot. 1031212002 This was supposed to be a fiducial shot, but not all of the rf power supplies were on. We will tray a second one. 1031212003 Successful fiducial. We will set up the target ITB for the next shot. RF is got back to 1.8 MW 1031212004 First attempt: H-mode with 4 back transitions. Probable ITB forming after 1.2 s 1031212005 H-mode with 3 back transitions. ITB forms anyway after 1.15 s 1031212006 H-mode with 3 back transitions. ITB forms after 1.2 s We will begin adjusting the triangularity on the next shot 1031212007 No H-Mode. RF problem. Plasma seems to have been limited. 1031212008 Three short H-Modes then RF cut out. We are still trying to adjust the shape to mimic 1031209011 1031212009 Several H-Modes with 1 full drop out. The plasma was forming a nice ITB before the back transition, from 1 s. 1031212010 Several H-Modes with 1 full drop out. The plasma was forming a nice ITB before the back transition,from 1 s. Best ITB so far. 1031212011 Two good H-Modes with 1 full drop out. ITBs formed on both. The first one is quite good. Lower triangularity is 0.775. We will try adjusting the upper value. 1031212012 One good H-Modes with 1 full drop out. There is an ITB, but not apparently better than on shot 11. We will try this again. The upper triangularity was higher. 1031212013 It seems to be harder to sustain the H-Modes and it is less obvious that there is an ITB. We will go one more step on the upper triangularity. 1031212014 Many back transitions, no ITB. We pushed the upper triangularity a little too hard and got the Xpoint touching the inner wall. We will back off a bit. 1031212015 Several back transitions, but an ITB seems to have formed anyway. The upper triangularity was not as high as on shot 12, but we did get the x point off the wall. We are going back to shot 11 to test for reproducibility. 1031212016 Nice H-mode and ITB, but the plasma disrupted. This was back to the configuration of shot 11. 1031212017 Very similar to shot 11: Two h-modes with ITB. So far, it seems reliable at this configuration.We will go back to shot 6 and see if the earlier behavior is reproducible there. 1031212018 H-mode with some small back transitions and an ITB. Somewhat better than shot 6. We will return to shot 11 and try top optimize the ITB. 1031212019 H-mode with an ITB, probably better than shot 17. We are going to try top optimize it, then retest the higher upper triangularity over the next several shots. 1031212020 H-mode with an ITB, nicest one yet today. We are still plagued with drop outs caused by rising radiation levels. We will try doing ECDC for 10 minutes. 1031212021 H-mode with an ITB. Very similar to shot 20, despite running ECDC. We will now return to the triangularity of shot 12. We are remaining at slightly higher target density than for shot 12. 1031212022 H-mode with an ITB. Slower density rise that shot 21, and takes longer before it collapses. Upper triangularity is .466 1031212023 H-mode with an ITB. Possibly less radiation. We will attempt to run double null. 1031212024 Many H-modes, No ITB. The rf tuning was not optimal. We achieved a double null. Oops, the field was at 5.4 T. 1031212025 H-mode started later, not too many drop outs. Possible ratty ITB late. RF matching wasnot good, so we will repeat this and give them a chance to tune better. We got a double null at the correct field. 1031212026 No ITB. We'll try slightly higher rf power to keep it in H-mode. 1031212027 Double null ITB with 2.5 MW rf! No Dalsa measurement. We'll repeat. 1031212028 Strange shot. Possible ITB, but no Dalsa. We'll repeat 1031212029 Many drop outs. Possible brief ITB before disruption. We will try again with slightly higher power. 1031212030 ITB at 2.8 MW applied power, in double null. 1031212031 ITB at 3 MW applied power, in double null. 1031212032 Fizzle 1031212033 ITB at 2.5 MW, at high triangularity single null. 1031212034 Long lasting ITB at 2.5 MW, at high triangularity single null. We started with a higher target density. 1031212035 Probable long lasting ITB at 3.0 MW, at high triangularity single null, although it might not be as peaked as some of the others. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:20:037PM |
| Author: Joseph Snipes |
| Engineering setup for Friday 12 Dec 2003 MP#374 --- ITB dependence on triangularity Session leader : Fiore/Rice Physics operator: Snipes 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 on 1031202024 A-coils should be hooked up as on 1031126028 (+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) Enable gatevalves (there will be no vacuum problems): ECE, VUV, DNB ------------------------------------------------------------------------------- RF Setup: All 4 transmitters in Run On by 08:00 ------------------------------------------------------------------------------- Session Leader Run Plan: The purpose of this experiment is to explore the influence of the plasma triangularity on the ITB quality, and specifically to see if obtaining an ITB is easier, and if higher densities and better confinement can be achieved. Reproduce ITB from 1021010004 (1-5 shots) How we proceed depends on whether we can successfully make ITBs. From the triangularity settings of that shot, scan up in delta_lower (0.1 increments up to 0.75, 5-8 shots) Repeat for delta_upper holding delta_lower constant. If a good high triangularity ITB has been established, scan target density to optimize ITB. Summary: Excellent run. We obtained all that we wanted and then some. High triangularity does seem to improve the ITB's. We even obtained very peaked ITB's in double null configuration with densities up to 8 x 10^20 m^-3. The machine ran very well today. The first shot had a computer problem so there was no power. Then, there were 30 full length plasmas in a row and finally a fizzle at 4:30 pm followed by 3 more full length plasmas. Scorecard: 35 shots, 1 no power test, 1 fizzle, 33 full plasmas. Shot 1: Start with an RF fiducial. Copied segment 2 from shot 1031204037. Using startup from 1031211030 where Br0 = 0, EF4 current = -1335 A, and the prepuff duration is 17 ms. Computer problem, no power shot. Shot 2: Try again. Good shot. Only E port RF. Shot 3: Try again with all the RF antennas. Got a decent 4 MW fiducial. Shot 4: Copied segment 2 from 1021010004 and zeroed the A coil current. NINJA D2 puff at 0.5 s. Good shot. A number of brief H-modes. Shot 5: Increased ZXU by 1 cm to +4 cm from 0.45 s to 1.5 s to try to pull the upper X point further away. Good shot with a number of brief H-modes. Shot 6: Repeat to better tune the RF to be constant. Good shot got a decent ITB. Shot 7: Increased triangularity by using settings for RCUR, ZCUR, RXL, and ZXU from shot 1031209011. Good shot, but only 0.8 MW of RF from E port. Looks like I overdid it and reduced the outer gap to zero. Forgot to change CLEARIN when I changed RCUR. Shot 8: Returned RCUR to 0.657 m to put the outer gap back where it was. Still RF did not couple well. Shot 9: Changed RCUR back to 0.666 m as on shot 1031209011 and changed CLEARIN to agree with that shot as well at 0.008. Try again. Good shot with an ITB, but the outer gap is down to 0.6 cm with a 2 cm inner gap. Shot 10: Reduced RCUR by 1 mm to 0.665 m to slightly increase the outer gap and decrease the inner gap. Good shot. Got another ITB. Shot 11: Decreased RCUR by another mm to 0.654 m to avoid RF trip at a small outer gap. Good shot with a nice ITB. Shot 12: Decreased RXU by 3 cm to -0.05 m throughout the flattop to increase the upper triangularity. Good shot. Got another ITB. Shot 13: Repeat. Good shot. Similar to the previous one. Shot 14: Increased ZXU by 0.02 m to 0.07 m and decreased RXU by 0.02 m to -0.07 m to further increase the upper triangularity. Did not get increased upper triangularity because the upper X point appears at the inner wall. No ITB. Shot 15: Try half way in between by taking 1 cm away from RXU to -0.06 m and increased ZXU another 0.5 cm to 0.075 m. Good shot. Perhaps a couple of minor ITB's. Shot 16: Reload shot 1031212011. Very good shot with a long H-mode with ITB. Disrupted at 1.25 s probably because there was too strong an ITB with too much radiation. Shot 17: Repeat. Good shot similar to shot 11 with an ITB. Shot 18: Reloaded shot 1031212006 to check for reproducibility of the ITB. Good shot. Got an ITB late in the last H-mode. Shot 19: Reloaded shot 11 and increased nl04 to 9.5 x 10^19 m^-2. Good shot with a nice long H-mode and ITB. Shot 20: Increased nl04 to 1 x 10^20 m^-2. Good shot. Nice long H-mode and ITB, but the radiation kills it by 1.12 s. Shot 21: ECDC'd for 10 minutes before this shot to see if we could reduce the impurities a bit to possibly extend the ITB duration. Good shot, very similar to shot 20. Shot 22: Reloaded shot 1031212012 and increased nl04 to 1 x 10^20 m^-2. Brief delay for Irby to adjust the TCI. Good shot. Nice long H-mode with ITB. Shot 23: Repeat with nl04 = 1.05 x 10^20 m^-2. Good shot. Long H-mode with weaker ITB. Shot 24: Loaded segment 4 from shot 1031125018 to go to double null. Raised nl04 to 1 x 10^20 m^-2. Good shot. Several brief H-modes with only just over 1 MW of RF. I did not reduce the field to get the ITB's since I just copied that segment from the old shot, which was at 5.4 T. Shot 25: Changed the TF to be similar to the previous shots today at go to 4.55 T. Several H-modes with no ITB. Shot 26: Repeat to tune the RF. Several brief H-modes. No ITB. Shot 27: Repeat with higher RF power since the threshold in double null may be higher. Nice ITB in double null with the highest density yet today. Shot 28: Repeat to get TCI data. Not repeatable. Instead there were multiple H-modes and RF trips with perhaps a weak ITB. Shot 29: Repeat to get dalsa data. Decent shot similar to shot 28 perhaps with a weak ITB. Shot 30: Repeat to get more RF power. Good shot with a nice ITB. Shot 31: Repeat. Good shot again with a very peaked ITB at the end just before the disruption. Shot 32: Reloaded shot 1031212012 and raised nl04 to 1.05 x 10^20 m^-2. Raise RF to 2.5 MW. Fizzle! Shot 33: Repeat. Good shot. Long H-mode but not such a strong ITB this time. Shot 34: Added 50 V pre-programmed gas early on pulse gas 3 to try to raise the target density a bit more. Really long H-mode with a nice ITB. Shot 35: Repeat with more RF power. Good shot with a nice long H-mode with ITB and 3 MW of RF. |
| Session Leader Comments | |||
| Dec 12 2003 08:24:10:483AM | Catherine Fiore | Session Leader Run Plan: MP 374 ITB dependence on triangularity Session Leader Fiore/Rice Phys. Op.: Snipes The purpose of this experiment is to explore the influence of the plasma triangularity on the ITB quality, and specifically to see if obtaining an ITB is easier, and if higher densities and better confinement can be achieved. Reproduce ITB from 1021010004 (1-5 shots) How we proceed depends on whether we can successfully make ITBs. From the triangularity settings of that shot, scan up in delta_lower (0.1 increments up to 0.75, 5-8 shots) Repeat for delta_upper holding delta_lower constant. If a good high triangularity ITB has been established, scan target density to optimize ITB. It was noted from yesterday's run that radiation levels were quite high. We believe that excess radiation kept us from successfully completing this run on 12/2. If we can not establish an ITB this morning, we will probably pass this run to another MP. | |
| Dec 12 2003 09:27:11:883AM | 1031212001 | Catherine Fiore | This was a no power shot. |
| Dec 12 2003 09:28:34:617AM | 1031212002 | Catherine Fiore | This was supposed to be a fiducial shot, but not all of the rf power supplies were on. We will tray a second one. |
| Dec 12 2003 09:41:06:387AM | 1031212003 | Catherine Fiore | Successful fiducial. We will set up the target ITB for the next shot. RF is got back to 1.8 MW |
| Dec 12 2003 10:01:38:427AM | 1031212004 | Catherine Fiore | First attempt: H-mode with 4 back transitions. Probable ITB forming after 1.2 s |
| Dec 12 2003 10:11:17:820AM | 1031212005 | Catherine Fiore | H-mode with 3 back transitions. ITB forms anyway after 1.15 s |
| Dec 12 2003 10:27:32:827AM | 1031212006 | Catherine Fiore | H-mode with 3 back transitions. ITB forms after 1.2 s We will begin adjusting the triangularity on the next shot |
| Dec 12 2003 10:42:45:460AM | 1031212007 | Catherine Fiore | No H-Mode. RF problem. Plasma seems to have been limited. |
| Dec 12 2003 10:52:33:713AM | 1031212008 | Catherine Fiore | Three short H-Modes then RF cut out. We are still trying to adjust the shape to mimic 1031209011 |
| Dec 12 2003 11:10:08:843AM | 1031212009 | Catherine Fiore | Several H-Modes with 1 full drop out. The plasma was forming a nice ITB before the back transition, from 1 s. |
| Dec 12 2003 11:23:09:787AM | 1031212010 | Catherine Fiore | Several H-Modes with 1 full drop out. The plasma was forming a nice ITB before the back transition, from 1 s. Best ITB so far. |
| Dec 12 2003 11:40:55:827AM | 1031212011 | Catherine Fiore | Two good H-Modes with 1 full drop out. ITBs formed on both. The first one is quite good. Lower triangularity is 0.775. We will try adjusting the upper value. |
| Dec 12 2003 11:54:25:343AM | 1031212012 | Catherine Fiore | One good H-Modes with 1 full drop out. There is an ITB, but not apparently better than on shot 11. We will try this again. The upper triangularity was higher. |
| Dec 12 2003 12:02:25:050PM | 1031212013 | Catherine Fiore | It seems to be harder to sustain the H-Modes and it is less obvious that there is an ITB. We will go one more step on the upper triangularity. |
| Dec 12 2003 12:14:20:900PM | 1031212014 | Catherine Fiore | Many back transitions, no ITB. We pushed the upper triangularity a little too hard and got the Xpoint touching the inner wall. We will back off a bit. |
| Dec 12 2003 12:29:45:500PM | 1031212015 | Catherine Fiore | Several back transitions, but an ITB seems to have formed anyway. The upper triangularity was not as high as on shot 12, but we did get the x point off the wall. We are going back to shot 11 to test for reproducibility. |
| Dec 12 2003 12:38:24:550PM | 1031212016 | Catherine Fiore | Nice H-mode and ITB, but the plasma disrupted. This was back to the configuration of shot 11. |
| Dec 12 2003 12:54:22:807PM | 1031212017 | Catherine Fiore | Very similar to shot 11: Two h-modes with ITB. So far, it seems reliable at this configuration. We will go back to shot 6 and see if the earlier behavior is reproducible there. |
| Dec 12 2003 01:08:45:500PM | 1031212018 | Catherine Fiore | H-mode with some small back transitions and an ITB. Somewhat better than shot 6. We will return to shot 11 and try top optimize the ITB. |
| Dec 12 2003 01:21:09:160PM | 1031212019 | Catherine Fiore | H-mode with an ITB, probably better than shot 17. We are going to try top optimize it, then retest the higher upper triangularity over the next several shots. |
| Dec 12 2003 01:31:36:303PM | 1031212020 | Catherine Fiore | H-mode with an ITB, nicest one yet today. We are still plagued with drop outs caused by rising radiation levels. We will try doing ECDC for 10 minutes. |
| Dec 12 2003 01:57:34:063PM | 1031212021 | Catherine Fiore | H-mode with an ITB. Very similar to shot 20, despite running ECDC. We will now return to the triangularity of shot 12. We are remaining at slightly higher target density than for shot 12. |
| Dec 12 2003 02:27:23:043PM | 1031212022 | Catherine Fiore | H-mode with an ITB. Slower density rise that shot 21, and takes longer before it collapses. Upper triangularity is .466 |
| Dec 12 2003 02:39:45:770PM | 1031212023 | Catherine Fiore | H-mode with an ITB. Possibly less radiation. We will attempt to run double null. |
| Dec 12 2003 02:54:41:307PM | 1031212024 | Catherine Fiore | Many H-modes, No ITB. The rf tuning was not optimal. We achieved a double null. Oops, the field was at 5.4 T. |
| Dec 12 2003 03:01:19:963PM | 1031212025 | Catherine Fiore | H-mode started later, not too many drop outs. Possible ratty ITB late. RF matching wasnot good, so we will repeat this and give them a chance to tune better. We got a double null at the correct field. |
| Dec 12 2003 03:25:44:800PM | 1031212026 | Catherine Fiore | No ITB. We'll try slightly higher rf power to keep it in H-mode. |
| Dec 12 2003 03:43:00:183PM | 1031212027 | Catherine Fiore | Double null ITB with 2.5 MW rf! No Dalsa measurement. We'll repeat. |
| Dec 12 2003 03:41:53:853PM | 1031212028 | Catherine Fiore | Strange shot. Possible ITB, but no Dalsa. We'll repeat. |
| Dec 12 2003 03:54:07:297PM | 1031212029 | Catherine Fiore | Many drop outs. Possible brief ITB before disruption. We will try again with slightly higher power. |
| Dec 12 2003 04:07:42:113PM | 1031212030 | Catherine Fiore | ITB at 2.8 MW applied power, in double null. |
| Dec 12 2003 04:24:18:153PM | 1031212031 | Catherine Fiore | ITB at 3 MW applied power, in double null. |
| Dec 12 2003 04:24:32:557PM | 1031212032 | Catherine Fiore | Fizzle |
| Dec 12 2003 04:43:23:300PM | 1031212033 | Catherine Fiore | ITB at 2.5 MW, at high triangularity single null. |
| Dec 12 2003 04:57:25:460PM | 1031212034 | Catherine Fiore | Long lasting ITB at 2.5 MW, at high triangularity single null. We started with a higher target density. |
| Dec 12 2003 05:06:31:200PM | 1031212035 | Catherine Fiore | Long lasting ITB at 3.0 MW, at high triangularity single null, although it might not be as peaked as some of the others. |
| Dec 12 2003 05:11:09:153PM | 1031212035 | Catherine Fiore | Probable long lasting ITB at 3.0 MW, at high triangularity single null, although it might not be as peaked as some of the others. |
| Physics Operator Comments | |||
| Dec 12 2003 08:19:07:717AM | Joseph Snipes | Engineering setup for Friday 12 Dec 2003 MP#374 --- ITB dependence on triangularity Session leader : Fiore/Rice Physics operator: Snipes 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 on 1031202024 A-coils should be hooked up as on 1031126028 (+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) Enable gatevalves (there will be no vacuum problems): ECE, VUV, DNB ------------------------------------------------------------------------------- RF Setup: All 4 transmitters in Run On by 08:00 ------------------------------------------------------------------------------- Session Leader Run Plan: The purpose of this experiment is to explore the influence of the plasma triangularity on the ITB quality, and specifically to see if obtaining an ITB is easier, and if higher densities and better confinement can be achieved. Reproduce ITB from 1021010004 (1-5 shots) How we proceed depends on whether we can successfully make ITBs. From the triangularity settings of that shot, scan up in delta_lower (0.1 increments up to 0.75, 5-8 shots) Repeat for delta_upper holding delta_lower constant. If a good high triangularity ITB has been established, scan target density to optimize ITB. | |
| Dec 12 2003 09:28:08:960AM | 1031212001 | Joseph Snipes | Shot 1: Start with an RF fiducial. Copied segment 2 from shot 1031204037. Using startup from 1031211030 where Br0 = 0, EF4 current = -1335 A, and the prepuff duration is 17 ms. Computer problem, no power shot. |
| Dec 12 2003 09:28:19:540AM | 1031212002 | Joseph Snipes | Shot 2: Try again. Good shot. Only E port RF. |
| Dec 12 2003 09:38:54:560AM | 1031212003 | Joseph Snipes | Shot 3: Try again with all the RF antennas. Got a decent 4 MW fiducial. |
| Dec 12 2003 09:52:36:533AM | 1031212004 | Joseph Snipes | Shot 4: Copied segment 2 from 1021010004 and zeroed the A coil current. NINJA D2 puff at 0.5 s. Good shot. A number of brief H-modes. |
| Dec 12 2003 10:05:31:540AM | 1031212005 | Joseph Snipes | Shot 5: Increased ZXU by 1 cm to +4 cm from 0.45 s to 1.5 s to try to pull the upper X point further away. Good shot with a number of brief H-modes. |
| Dec 12 2003 10:33:35:457AM | 1031212006 | Joseph Snipes | Shot 6: Repeat to better tune the RF to be constant. Good shot got a decent ITB. |
| Dec 12 2003 10:47:53:397AM | 1031212007 | Joseph Snipes | Shot 7: Increased triangularity by using settings for RCUR, ZCUR, RXL, and ZXU from shot 1031209011. Good shot, but only 0.8 MW of RF from E port. Looks like I overdid it and reduced the outer gap to zero. Forgot to change CLEARIN when I changed RCUR. |
| Dec 12 2003 10:55:24:603AM | 1031212008 | Joseph Snipes | Shot 8: Returned RCUR to 0.657 m to put the outer gap back where it was. Still RF did not couple well. |
| Dec 12 2003 11:09:15:407AM | 1031212009 | Joseph Snipes | Shot 9: Changed RCUR back to 0.666 m as on shot 1031209011 and changed CLEARIN to agree with that shot as well at 0.008. Try again. Good shot with an ITB, but the outer gap is down to 0.6 cm with a 2 cm inner gap. |
| Dec 12 2003 11:18:33:580AM | 1031212010 | Joseph Snipes | Shot 10: Reduced RCUR by 1 mm to 0.665 m to slightly increase the outer gap and decrease the inner gap. Good shot. Got another ITB. |
| Dec 12 2003 11:36:03:730AM | 1031212011 | Joseph Snipes | Shot 11: Decreased RCUR by another mm to 0.654 m to avoid RF trip at a small outer gap. Good shot with a nice ITB. |
| Dec 12 2003 11:42:50:450AM | 1031212012 | Joseph Snipes | Shot 12: Decreased RXU by 3 cm to -0.05 m throughout the flattop to increase the upper triangularity. Good shot. Got another ITB. |
| Dec 12 2003 11:55:41:500AM | 1031212013 | Joseph Snipes | Shot 13: Repeat. Good shot. Similar to the previous one. |
| Dec 12 2003 12:12:34:773PM | 1031212014 | Joseph Snipes | Shot 14: Increased ZXU by 0.02 m to 0.07 m and decreased RXU by 0.02 m to -0.07 m to further increase the upper triangularity. Did not get increased upper triangularity because the upper X point appears at the inner wall. No ITB. |
| Dec 12 2003 12:26:56:297PM | 1031212015 | Joseph Snipes | Shot 15: Try half way in between by taking 1 cm away from RXU to -0.06 m and increased ZXU another 0.5 cm to 0.075 m. Good shot. Perhaps a couple of minor ITB's. |
| Dec 12 2003 12:38:17:033PM | 1031212016 | Joseph Snipes | Shot 16: Reload shot 1031212011. Very good shot with a long H-mode with ITB. Disrupted at 1.25 s probably because there was too strong an ITB with too much radiation. |
| Dec 12 2003 12:49:37:273PM | 1031212017 | Joseph Snipes | Shot 17: Repeat. Good shot similar to shot 11 with an ITB. |
| Dec 12 2003 01:03:08:293PM | 1031212018 | Joseph Snipes | Shot 18: Reloaded shot 1031212006 to check for reproducibility of the ITB. Good shot. Got an ITB late in the last H-mode. |
| Dec 12 2003 01:15:59:330PM | 1031212019 | Joseph Snipes | Shot 19: Reloaded shot 11 and increased nl04 to 9.5 x 10^19 m^-2. Good shot with a nice long H-mode and ITB. |
| Dec 12 2003 01:30:53:977PM | 1031212020 | Joseph Snipes | Shot 20: Increased nl04 to 1 x 10^20 m^-2. Good shot. Nice long H-mode and ITB, but the radiation kills it by 1.12 s. |
| Dec 12 2003 01:54:17:440PM | 1031212021 | Joseph Snipes | Shot 21: ECDC'd for 10 minutes before this shot to see if we could reduce the impurities a bit to possibly extend the ITB duration. Good shot, very similar to shot 20. |
| Dec 12 2003 02:17:15:180PM | 1031212022 | Joseph Snipes | Shot 22: Reloaded shot 1031212012 and increased nl04 to 1 x 10^20 m^-2. Brief delay for Irby to adjust the TCI. Good shot. Nice long H-mode with ITB. |
| Dec 12 2003 02:31:24:297PM | 1031212023 | Joseph Snipes | Shot 23: Repeat with nl04 = 1.05 x 10^20 m^-2. Good shot. Long H-mode with weaker ITB. |
| Dec 12 2003 02:49:31:023PM | 1031212024 | Joseph Snipes | Shot 24: Loaded segment 4 from shot 1031125018 to go to double null. Raised nl04 to 1 x 10^20 m^-2. Good shot. Several brief H-modes with only just over 1 MW of RF. I did not reduce the field to get the ITB's since I just copied that segment from the old shot, which was at 5.4 T. |
| Dec 12 2003 02:57:04:243PM | 1031212025 | Joseph Snipes | Shot 25: Changed the TF to be similar to the previous shots today at go to 4.55 T. Several H-modes with no ITB. |
| Dec 12 2003 03:11:13:513PM | 1031212026 | Joseph Snipes | Shot 26: Repeat to tune the RF. Several brief H-modes. No ITB. |
| Dec 12 2003 03:23:22:190PM | 1031212027 | Joseph Snipes | Shot 27: Repeat with higher RF power since the threshold in double null may be higher. Nice ITB in double null with the highest density yet today. |
| Dec 12 2003 03:37:13:320PM | 1031212028 | Joseph Snipes | Shot 28: Repeat to get TCI data. Not repeatable. Instead there were multiple H-modes and RF trips with perhaps a weak ITB. |
| Dec 12 2003 03:48:32:810PM | 1031212029 | Joseph Snipes | Shot 29: Repeat to get dalsa data. Decent shot similar to shot 28 perhaps with a weak ITB. |
| Dec 12 2003 03:59:35:313PM | 1031212030 | Joseph Snipes | Shot 30: Repeat to get more RF power. Good shot with a nice ITB. |
| Dec 12 2003 04:14:52:617PM | 1031212031 | Joseph Snipes | Shot 31: Repeat. Good shot again with a very peaked ITB at the end just before the disruption. |
| Dec 12 2003 04:42:57:050PM | 1031212033 | Joseph Snipes | Shot 33: Repeat. Good shot. Long H-mode but not such a strong ITB this time. |
| Dec 12 2003 04:53:18:520PM | 1031212034 | Joseph Snipes | Shot 34: Added 50 V pre-programmed gas early on pulse gas 3 to try to raise the target density a bit more. Really long H-mode with a nice ITB. |
| Dec 12 2003 05:04:20:450PM | 1031212035 | Joseph Snipes | Shot 35: Repeat with more RF power. Good shot with a nice long H-mode with ITB and 3 MW of RF. |
| Dec 12 2003 05:05:58:980PM | 1031212035 | Joseph Snipes | Summary: Excellent run. We obtained all that we wanted and then some. High triangularity does seem to improve the ITB's. We even obtained very peaked ITB's in double null configuration with densities up to 8 x 10^20 m^-3. The machine ran very well today. The first shot had a computer problem so there was no power. Then, there were 30 full length plasmas in a row and finally a fizzle at 4:30 pm followed by 3 more full length plasmas. Scorecard: 35 shots, 1 no power test, 1 fizzle, 33 full plasmas. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:11:09:737AM | Test | Bad | |
| 2 | 09:22:54:913AM | Plasma | Ok | |
| 3 | 09:34:49:027AM | Plasma | Ok | |
| 4 | 09:50:20:877AM | Plasma | Ok | |
| 5 | 10:02:57:507AM | Plasma | Ok | |
| 6 | 10:18:37:887AM | Plasma | Ok | |
| 7 | 10:33:46:410AM | Plasma | Ok | |
| 8 | 10:47:34:460AM | Plasma | Ok | |
| 9 | 11:00:06:730AM | Plasma | Ok | |
| 10 | 11:14:30:847AM | Plasma | Ok | |
| 11 | 11:26:56:833AM | Plasma | Ok | |
| 12 | 11:39:25:510AM | Plasma | Ok | |
| 13 | 11:51:57:487AM | Plasma | Ok | |
| 14 | 12:04:23:740PM | Plasma | Ok | |
| 15 | 12:20:32:277PM | Plasma | Ok | |
| 16 | 12:33:05:673PM | Plasma | Ok | |
| 17 | 12:45:31:537PM | Plasma | Ok | |
| 18 | 12:58:18:810PM | Plasma | Ok | |
| 19 | 01:11:05:577PM | Plasma | Ok | |
| 20 | 01:23:45:287PM | Plasma | Ok | |
| 21 | 01:50:44:297PM | Plasma | Ok | |
| 22 | 02:13:03:633PM | Plasma | Ok | |
| 23 | 02:27:06:357PM | Plasma | Ok | |
| 24 | 02:39:46:427PM | Plasma | Ok | |
| 25 | 02:52:24:240PM | Plasma | Ok | |
| 26 | 03:05:02:857PM | Plasma | Ok | |
| 27 | 03:17:41:877PM | Plasma | Ok | |
| 28 | 03:30:38:147PM | Plasma | Ok | |
| 29 | 03:43:27:293PM | Plasma | Ok | |
| 30 | 03:56:12:267PM | Plasma | Ok | |
| 31 | 04:09:00:550PM | Plasma | Ok | |
| 32 | 04:21:51:620PM | Plasma | Ok | |
| 33 | 04:34:36:563PM | Plasma | Ok | |
| 34 | 04:47:23:643PM | Plasma | Ok | |
| 35 | 05:00:11:197PM | Plasma | Ok | |