| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Catherine Fiore |
| Physics operator(s): | Joseph Snipes |
| Engineering operator(s): | Bill Cochran,Ed Fitzgerald,Bill Byford |
| Engineering Operator Run Comment |
| MP#341 Power Absorption in ITB; SL: Fiore; PO: snipes; EO:Cochran/Fitz/B |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:03:757PM |
| Author: Catherine Fiore |
| SL Fiore PO Snipes In this run we hope to complete MP 341 which ended prematurely when we lost the FMIT 4 output tube. We will start with shot 29 from 1040309 and re-establish the ITB from that shot. We will start with somewhat lower central ICRF power than on shot 29, and scan up until we lose the ITB. Once this is done, we should change the off axis power and repeat the central power scan. If time allows, we can try this at the higher field. ---------------------------------------------------------------------------- We obtained ITBs on at least 26 shots out of 31 plasma shots (1 early disruption). However, we had difficulty getting central ICRF power into the plasma until after shot 20 because of high neutral density, residual from boronizing the previous night. On the last shot of the day, 36, we briefly put 2 MW central power into the ITB, but a back transition quickly ensued. Much of the time we had problems with back transitions coming too early before we had a chance to turn on the central ICRF. On shot 26 we put in 1.4 MW central ICRF and clamped the density rise, as we did with 1.5 MW on shot 33. Also we added 1 MW central power on shot 22 without affecting the ITB at all. There was some interesting MHD activity on a number of shots, #21 and #36 among them. Some impressions about ITBs in general and MP341 in particular: ITBs are easier to get and maintain in a cleaner machine. They benefit from having target density of 0.9-1 10^20 /m^3 as opposed to lower values. Higher triangularity plasmas seems to be more favorable. Off axis-ICRF power > 2MW is also preferred. MP341 establishes that we have not yet found a limit for adding central ICRF power to established ITBs under optimal conditions, and the limits we have seen in the past are probably related to the amount of radiated power in the plasma. ______________________________ Shot summary 1040323001-003 were data system tests. 1040323004 Good first shot, but no H-mode an less than 1 MW rf power. 1040323005 Again, no H-mode, intermittent rf power. 1040323006-007 data system problems 1040323008 Again, no H-mode, intermittent rf power. 1040323009 Good shot, H-mode with ITB. RF has 2 MW off axis, but we drop out of Hmode when the power drops at 1.3 s. No central ICRF. We'll try again. 1040323010 No H-mode. 1040323011 H-mode with ITB, but still no central ICRF. The neutral density is apparently too high. We'll keep trying, possibly with lower triangularity. 1040323012 Early disruption. 1040323013 H-mode with ITB. Still no central ICRF 1040323014 H-mode with ITB. Still no central ICRF 1040323015 H-mode with ITB. Still no central ICRF 1040323016 H-mode with ITB. Still no central ICRF 1040323017 H-mode with ITB. Still no central ICRF 1040323018 H-mode with ITB. Still no central ICRF 1040323019 H-mode with ITB. Finally central rf (we lowered the target density) but there was a back transition before J-port came on. We are going to raise the target density a little higher, to 0.9 10^20 1040323020 H-mode with ITB. Finally a little central rf (we lowered the target density) but there was a back transition before J-port came on. 1040323021 H-mode with ITB that self arrested for no apparent reason. No central rf. Extremely unusual. There is apparently a lot of MHD activity. 1040323022 H-mode with ITB. 1. MW central rf. No arrest on the ITB. We will try higher power. 1040323023 H-mode with ITB. 1.4 MW central rf. Premature back transition. We will try to repeat the shot. 1040323024 H-mode with ITB. Disrupts near the time J-port is coming on. 1040323025 H-mode with ITB, but it back transitioned before J-port came on. We will fire J-port earlier, at 1.1 s. 1040323026 H-mode with ITB, great shot. 1.4 MW central power into the ITB without clamping the rise. It disrupted, however. We'll try going up on J port power some more. 1040323027 H-mode with ITB, 1.6 MW central power into the ITB which clamped the ITB. The stored energy and neutron rate did not get as high as on 1040309029 however. We will change the J-port timing back to 1.2 s and hope for the best. 1040323028 H-mode with ITB, but it back transitioned before the central power (1.5 MW comes in. We will try to increase the target density to see if we can avoid the early back transition. 1040323029 H-mode with ITB, but it back transitioned before the central power comes in. There are multiple trips on J. 1040323030 H-mode with ITB, but it disrupted before the central power comes in. We will try to increase the target density to see if we can avoid the early back transition. 1040323031 H-mode with ITB, but it back transitioned before the central power comes in. We will try to back off on the D and E port power to see if we can slow the impurity influx. 1040323032 H-mode with ITB, but it back transitioned before the central power comes in. We will bring in the central ICRF earlier. 1040323033 H-mode with ITB. 1.5 MW central power clamps the density rise. We will try to push the power up some more. 1040323034 H-mode with ITB. It back transitioned before the central ICRF came on. 1040323035 H-mode with ITB. It back transitioned before the central ICRF came on. 1040323036 H-mode with ITB. 2 MW central power came on for 50 ms before we get a back transition. The neutron rate reached 2 10^13 before the transition. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:49:583PM |
| Author: Joseph Snipes |
| Run Plan and Engineering Setup for Tuesday 23-Mar-2004 MP#341 Power Absorption in ITB SL: Fiore PO: snipes Engineering setup: ------------------ Run begins at 09:00 (or as close as possible), ends at 17:00 Overnight boronization. Power supplies as on 1040309013 Gas System 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 with 15 psi He3 Hybrid DISABLED (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) fill NINJA (lower cap) with 8 psi D2 Gate valve permissives for the usual suspects (ECE, VUV, DNB) assuming no vacuum problems RF: Transmitters #1,2,3 and 4 in RUN-ON by 08:00 Run Plan: --------- Finish off the MP begun on Tuesday, 1040309. Specifically, we still need to determine the highest on-axis power we can use without destroying the high-field side resonance ITB (4.5T), and document the confinement properties. Then we can proceed to the low-field side resonance, using the 70MHz for off-axis heating at B~5.6T and 80MHz on-axis. We will start with a shot like 1040309029, which had 1.5MW of on-axis 70MHz. We will revisit a few lower power cases, to verify reproducibility of last week's results, in view of the fact that we are now one week after the boronization. We will then increase the on-axis power until we get clear indication of loss of the core barrier. We will also try varying the off-axis power to see how that affects the amount of core heating allowed. If we complete the 4.5 T experiments, we will continue the MP by going through the same sequence for low-field side resonance at 5.6T. Summary: There were 3 system test shots to start the day followed by two good plasma shots, but on the second plasma shot, the data system hung and there were two more data system test shots. All plasma attempts had successful current rises with no changes to the startup throughout the day and the machine ran very well. Only one shot disrupted early, though there were a number of disruptions following long EDA H-modes. There was difficulty coupling J-port power above 0.3 mTorr neutral pressure, so we reduced the density to lower the neutral pressure and that allowed better J-port coupling. Most shots had long EDA H-modes with ITB's and a number of shots arrested the ITB's with central RF power. One shot arrested the ITB without central RF power (1040323021) apparently due to a 5 - 12 kHz MHD mode. The last shot of the day had somewhat higher density and we returned to the triangularity of the previous good run and it had a large increase in the neutron rate during the ITB up to 2.3 x 10^13 n/s. Scorecard: 36 shots, 31 plasmas, 5 tests. There were 3 system test shots to start the day. Shot 4: Copied shot 1040309029. Good shot, but little RF and no H-mode. Shot 5: Try again. Good shot. Reached 2 MW but there was no H-mode. Shot 6: Data system failed, cooling system delay, RF delay. Finally, cycle test shot. Shot 7: A second no power test shot. Shot 8: One more time . . . Good shot. Got 2 MW intermittently but no H-mode. Wukitch claims that the neutral pressure is too high to get the RF working well. Shot 9: Try again. Good shot. Got H-mode with an ITB from 0.8 to nearly 1.3 s. Shot 10: Steady L-mode. Very similar to shot 9 on the RF, but no H-mode. Shot 11: Good shot. 2 MW nearly steady with an H-mode with an ITB. Shot 12: Increased RXL from -2 cm to -1.5 cm to see if reducing the triangularity might reduce the plasma surface interaction with the inner wall and reduce the neutral pressure to help get the RF working. Disrupted at 0.18 s. Shot 13: Noted that both the TF and Ip had a jump at segment switch. It may not be responsible for this disruptive behavior, but I changed Ip to 0.45 MA at 0.1 s in segment 2 to match segment 1 and then moved the flattop point at 0.8 MA from 0.15 s to 0.19 s to reduce the ramp rate a bit. Then, changed the TF current in segment 2 to 149 kA from 150 kA to match segment 1. Try again. Good shot. Shot 14: Repeat. Good shot with H-mode and ITB. Shot 15: Set Ip to 0.62 MA at 0.1 s in segment 2 and moved the flattop value of 0.8 MA to 0.22 s. Good shot. Nice long EDA H-mode with ITB. Shot 16: Good shot. Nice long EDA H-mode with ITB. Shot 17: Good shot. Nice long EDA H-mode with ITB. Still no J-port central RF. Shot 18: Reduced nl04 from 1 x 10^20 m^-2 to 0.9 x 10^20 m^-2 to attempt to reduce the neutral pressure for J-port to work better. Good shot. Long EDA H-mode with ITB. Still no J-port. Disrupted at 1.5 s. Shot 19: Reduced nl04 to 8 x 10^19 m^-2. Good shot, but shorter H-mode with ITB. Neutral pressure now down to 0.18 mTorr, well below Wukitch's 0.3 mTorr threshold for good J-port operation, but J-port still did not stay on. Shot 20: Increased nl04 to 9 x 10^19 m^-2. Good shot. Long EDA H-mode with ITB, still no J-port even though the neutral pressure is below 0.3 mTorr. Shot 21: Repeat with more RF power. Got 2.5 MW out of D and E and a long EDA H-mode but no ITB and no J-port power. Arrested ITB without central J-port power. Shot 22: Reduced nl04 to 8.5 x 10^19 m^-2 to keep the neutral pressure below 0.3 mTorr for J-port. Good shot. D port tripped just before 1 s taking a bite out of the H-mode. J-port up to 0.8 MW. Shot 23: Repeat. Good shot. Got 1.2 MW from J-port intermittently and 2.5 MW from D and E. Long EDA H-mode with ITB. Shot 24: Good shot. EDA H-mode with ITB. Disrupted at 1.25 s just after J-port turns on. Shot 25: Good shot. Long EDA with ITB with 2.5 MW from D and E and 1.2 MW from J-port. Shot 26: Good shot. Nice long EDA H-mode with ITB. Disrupted at 1.38 s. Shot 27: Good shot. Nice long EDA H-mode with ITB. J-port up to 1.5 MW arrests ITB very clearly. Shot 28: Repeat. RF trips out at the H-L transition just before 1.2 s. Shot 29: Increased nl04 to 9 x 10^19 m^-2. Good shot. H-mode trips out at 1.15 s due to impurity accumulation again. Shot 30: Decreased nl04 to 8.5 x 10^19 m^-2. EDA H-mode with ITB but disrupted at 1.18 s. Shot 31: Increased nl04 to 9.5 x 10^19 m^-2. Good shot. EDA with ITB from 0.6 to almost 1.2 s, then there is an H-L transition before J-port comes on. Shot 32: Good shot. H-L transition at 1.15 s again apparently from too much impurity accumulation. Shot 33: Good shot with H-mode with ITB out to 1.35 s clamped by J-port ICRF. Shot 34: Good shot. EDA with ITB ends at 1.12 s just before J-port comes on. Shot 35: Good shot. Still getting H-L transition early though. Shot 36: Raised nl04 to 1 x 10^20 m^-2 and returned RXL to -2 cm as it had been earlier in the day. Good shot. Neutron rate reaches 2.3 x 10^13 n/s at the peak of the ITB. |
| Session Leader Comments | |||
| Mar 23 2004 08:16:57:027AM | Catherine Fiore | SL Fiore PO Snipes In this run we hope to complete MP 341 which ended prematurely when we lost the FMIT 4 output tube. We will start with shot 29 from 1040309 and re-establish the ITB from that shot. We will start with somewhat lower central ICRF power than on shot 29, and scan up until we lose the ITB. Once this is done, we should change the off axis power and repeat the central power scan. If time allows, we can try this at the higher field. | |
| Mar 23 2004 09:08:18:900AM | 1040323004 | Catherine Fiore | Good first shot, but no H-mode an less than 1 MW rf power. |
| Mar 23 2004 09:26:35:150AM | 1040323005 | Catherine Fiore | Again, no H-mode, intermittent rf power. |
| Mar 23 2004 10:30:48:013AM | 1040323008 | Catherine Fiore | Again, no H-mode, intermittent rf power. |
| Mar 23 2004 10:47:44:163AM | 1040323009 | Catherine Fiore | Good shot, H-mode with ITB. RF has 2 MW off axis, but we drop out of Hmode when the power drops at 1.3 s. No central ICRF. We'll try again. |
| Mar 23 2004 11:00:22:980AM | 1040323010 | Catherine Fiore | No H-mode. |
| Mar 23 2004 11:20:58:060AM | 1040323011 | Catherine Fiore | H-mode with ITB, but still no central ICRF. The neutral density is apparently too high. We'll keep trying, possibly with lower triangularity. |
| Mar 23 2004 11:35:39:970AM | 1040323012 | Catherine Fiore | Early disruption |
| Mar 23 2004 11:45:54:223AM | 1040323013 | Catherine Fiore | H-mode with ITB. Still no central ICRF |
| Mar 23 2004 12:01:43:247PM | 1040323014 | Catherine Fiore | H-mode with ITB. Still no central ICRF |
| Mar 23 2004 12:19:38:367PM | 1040323015 | Catherine Fiore | H-mode with ITB. Still no central ICRF |
| Mar 23 2004 12:30:24:290PM | 1040323016 | Catherine Fiore | H-mode with ITB. Still no central ICRF |
| Mar 23 2004 12:42:00:510PM | 1040323017 | Catherine Fiore | H-mode with ITB. Still no central ICRF |
| Mar 23 2004 12:54:54:970PM | 1040323018 | Catherine Fiore | H-mode with ITB. Still no central ICRF |
| Mar 23 2004 01:18:44:880PM | 1040323019 | Catherine Fiore | H-mode with ITB. Still no central rf (we lowered the target density) but there was a back transition. We are going to raise the target density a little higher, to 0.9 10^20 |
| Mar 23 2004 01:22:00:887PM | 1040323020 | Catherine Fiore | H-mode with ITB. Finally a little central rf (we lowered the target density) but there was a back transition before J-port came on. |
| Mar 23 2004 01:42:13:510PM | 1040323021 | Catherine Fiore | H-mode with ITB that self arrested for no apparent reason. No central rf. Extremely unusual. |
| Mar 23 2004 02:06:05:670PM | 1040323022 | Catherine Fiore | H-mode with ITB. 1. MW central rf. No arrest on the ITB |
| Mar 23 2004 02:04:08:463PM | 1040323023 | Catherine Fiore | H-mode with ITB. 1.4 MW central rf. Premature back transition. We will try to repeat the shot. |
| Mar 23 2004 02:22:59:353PM | 1040323024 | Catherine Fiore | H-mode with ITB. Disrupts near the time J-port is coming on. |
| Mar 23 2004 02:35:03:637PM | 1040323025 | Catherine Fiore | H-mode with ITB, but it back transitioned before J-port came on. We will fire J-port earlier, at 1.1 s. |
| Mar 23 2004 02:48:23:050PM | 1040323026 | Catherine Fiore | H-mode with ITB, great shot but no visible bremsstrahlung data. 1.3 MW central power into the ITB without clamping the rise. It disrupted, however. We'll try going up on J port power some more. |
| Mar 23 2004 03:01:33:337PM | 1040323027 | Catherine Fiore | H-mode with ITB, 1.6 MW central power into the ITB which clamped the ITB. The stored energy and neutron rate did not get as high as on 1040309029 however. We will change the J-port timing back to 1.2 s and hope for the best. |
| Mar 23 2004 03:17:17:687PM | 1040323028 | Catherine Fiore | H-mode with ITB, but it back transitioned before the central power (1.5 MW comes in. We will try to increase the target density to see if we can avoid the early back transition. |
| Mar 23 2004 03:31:42:820PM | 1040323029 | Catherine Fiore | H-mode with ITB, but it back transitioned before the central power comes in. There are multiple trips on J. |
| Mar 23 2004 03:46:31:200PM | 1040323030 | Catherine Fiore | H-mode with ITB, but it disrupted before the central power comes in. We will try to increase the target density to see if we can avoid the early back transition. |
| Mar 23 2004 03:56:38:730PM | 1040323031 | Catherine Fiore | H-mode with ITB, but it back transitioned before the central power comes in. We will try to back off on the D and E port power to see if we can slow the impurity influx. |
| Mar 23 2004 04:11:06:880PM | 1040323032 | Catherine Fiore | H-mode with ITB, but it back transitioned before the central power comes in. We will bring in the central ICRF earlier |
| Mar 23 2004 04:21:35:800PM | 1040323033 | Catherine Fiore | H-mode with ITB. 1.5 MW central power clamps the density rise. We will try to push the power up some more. |
| Mar 23 2004 04:47:25:450PM | 1040323034 | Catherine Fiore | H-mode with ITB. It back transitioned before the central ICRF came on. |
| Mar 23 2004 04:48:27:000PM | 1040323035 | Catherine Fiore | H-mode with ITB. It back transitioned before the central ICRF came on. |
| Mar 23 2004 05:06:14:590PM | 1040323036 | Catherine Fiore | H-mode with ITB. 2 MW central power came on for 50 ms before we get a back transition. The neutron rate reached 2 10^13 before the transition. |
| Physics Operator Comments | |||
| Mar 23 2004 08:10:55:750AM | Joseph Snipes | Run Plan and Engineering Setup for Tuesday 23-Mar-2004 MP#341 Power Absorption in ITB SL: Fiore PO: snipes Engineering setup: ------------------ Run begins at 09:00 (or as close as possible), ends at 17:00 Overnight boronization. Power supplies as on 1040309013 Gas System 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 with 15 psi He3 Hybrid DISABLED (PG2) fill C-side with 30 psi D2 Hybrid enabled (PG3) fill NINJA (lower cap) with 8 psi D2 Gate valve permissives for the usual suspects (ECE, VUV, DNB) assuming no vacuum problems RF: Transmitters #1,2,3 and 4 in RUN-ON by 08:00 Run Plan: --------- Finish off the MP begun on Tuesday, 1040309. Specifically, we still need to determine the highest on-axis power we can use without destroying the high-field side resonance ITB (4.5T), and document the confinement properties. Then we can proceed to the low-field side resonance, using the 70MHz for off-axis heating at B~5.6T and 80MHz on-axis. We will start with a shot like 1040309029, which had 1.5MW of on-axis 70MHz. We will revisit a few lower power cases, to verify reproducibility of last week's results, in view of the fact that we are now one week after the boronization. We will then increase the on-axis power until we get clear indication of loss of the core barrier. We will also try varying the off-axis power to see how that affects the amount of core heating allowed. If we complete the 4.5 T experiments, we will continue the MP by going through the same sequence for low-field side resonance at 5.6T. | |
| Mar 23 2004 09:08:53:170AM | 1040323004 | Joseph Snipes | Shot 1: Copied shot 1040309029. Good shot, but little RF and no H-mode. |
| Mar 23 2004 09:27:17:040AM | 1040323005 | Joseph Snipes | Shot 5: Try again. Good shot. Reached 2 MW but there was no H-mode. |
| Mar 23 2004 10:12:52:453AM | 1040323006 | Joseph Snipes | Shot 6: Data system failed, cooling system delay, RF delay. Finally, cycle test shot. |
| Mar 23 2004 10:15:55:567AM | 1040323007 | Joseph Snipes | Shot 7: A second no power test shot. |
| Mar 23 2004 10:41:04:030AM | 1040323008 | Joseph Snipes | Shot 8: One more time . . . Good shot. Got 2 MW intermittently but no H-mode. Wukitch claims that the neutral pressure is too high to get the RF working well. |
| Mar 23 2004 10:45:00:067AM | 1040323009 | Joseph Snipes | Shot 9: Try again. Good shot. Got H-mode with an ITB from 0.8 to nearly 1.3 s. |
| Mar 23 2004 11:01:36:013AM | 1040323010 | Joseph Snipes | Shot 10: Steady L-mode. Very similar to shot 9 on the RF, but no H-mode. |
| Mar 23 2004 11:20:33:277AM | 1040323011 | Joseph Snipes | Shot 11: Good shot. 2 MW nearly steady with an H-mode with an ITB. |
| Mar 23 2004 11:28:27:570AM | 1040323012 | Joseph Snipes | Shot 12: Increased RXL from -2 cm to -1.5 cm to see if reducing the triangularity might reduce the plasma surface interaction with the inner wall and reduce the neutral pressure to help get the RF working. Disrupted at 0.18 s. |
| Mar 23 2004 11:59:51:087AM | 1040323013 | Joseph Snipes | Shot 13: Noted that both the TF and Ip had a jump at segment switch. It may not be responsible for this disruptive behavior, but I changed Ip to 0.45 MA at 0.1 s in segment 2 to match segment 1 and then moved the flattop point at 0.8 MA from 0.15 s to 0.19 s to reduce the ramp rate a bit. Then, changed the TF current in segment 2 to 149 kA from 150 kA to match segment 1. Try again. Good shot. |
| Mar 23 2004 12:01:55:060PM | 1040323014 | Joseph Snipes | Shot 14: Repeat. Good shot with H-mode and ITB. |
| Mar 23 2004 12:14:44:673PM | 1040323015 | Joseph Snipes | Shot 15: Set Ip to 0.62 MA at 0.1 s in segment 2 and moved the flattop value of 0.8 MA to 0.22 s. Good shot. Nice long EDA H-mode with ITB. |
| Mar 23 2004 12:32:08:417PM | 1040323016 | Joseph Snipes | Shot 16: Good shot. Nice long EDA H-mode with ITB. |
| Mar 23 2004 12:42:54:107PM | 1040323017 | Joseph Snipes | Shot 17: Good shot. Nice long EDA H-mode with ITB. Still no J-port central RF. |
| Mar 23 2004 12:55:26:983PM | 1040323018 | Joseph Snipes | Shot 18: Reduced nl04 from 1 x 10^20 m^-2 to 0.9 x 10^20 m^-2 to attempt to reduce the neutral pressure for J-port to work better. Good shot. Long EDA H-mode with ITB. Still no J-port. Disrupted at 1.5 s. |
| Mar 23 2004 01:12:42:247PM | 1040323019 | Joseph Snipes | Shot 19: Reduced nl04 to 8 x 10^19 m^-2. Good shot, but shorter H-mode with ITB. Neutral pressure now down to 0.18 mTorr, well below Wukitch's 0.3 mTorr threshold for good J-port operation, but J-port still did not stay on. |
| Mar 23 2004 01:20:32:383PM | 1040323020 | Joseph Snipes | Shot 20: Increased nl04 to 9 x 10^19 m^-2. Good shot. Long EDA H-mode with ITB, still no J-port even though the neutral pressure is below 0.3 mTorr. |
| Mar 23 2004 01:40:51:523PM | 1040323021 | Joseph Snipes | Shot 21: Repeat with more RF power. Got 2.5 MW out of D and E and a long EDA H-mode but no ITB and no J-port power. Arrested ITB without central J-port power. |
| Mar 23 2004 01:45:49:763PM | 1040323022 | Joseph Snipes | Shot 22: Reduced nl04 to 8.5 x 10^19 m^-2 to keep the neutral pressure below 0.3 mTorr for J-port. Good shot. D port tripped just before 1 s taking a bite out of the H-mode. J-port up to 0.8 MW. |
| Mar 23 2004 02:03:11:433PM | 1040323023 | Joseph Snipes | Shot 23: Repeat. Good shot. Got 1.2 MW from J-port intermittently and 2.5 MW from D and E. Long EDA H-mode with ITB. |
| Mar 23 2004 02:20:28:567PM | 1040323024 | Joseph Snipes | Shot 24: Good shot. EDA H-mode with ITB. Disrupted at 1.25 s just after J-port turns on. |
| Mar 23 2004 02:34:33:247PM | 1040323025 | Joseph Snipes | Shot 25: Good shot. Long EDA with ITB with 2.5 MW from D and E and 1.2 MW from J-port. |
| Mar 23 2004 02:45:33:390PM | 1040323026 | Joseph Snipes | Shot 26: Good shot. Nice long EDA H-mode with ITB. Disrupted at 1.38 s. |
| Mar 23 2004 02:58:10:750PM | 1040323027 | Joseph Snipes | Shot 27: Good shot. Nice long EDA H-mode with ITB. J-port up to 1.5 MW arrests ITB very clearly. |
| Mar 23 2004 03:21:57:007PM | 1040323028 | Joseph Snipes | Shot 28: Repeat. RF trips out at the H-L transition just before 1.2 s. |
| Mar 23 2004 03:29:22:360PM | 1040323029 | Joseph Snipes | Shot 29: Increased nl04 to 9 x 10^19 m^-2. Good shot. H-mode trips out at 1.15 s due to impurity accumulation again. |
| Mar 23 2004 03:43:27:227PM | 1040323030 | Joseph Snipes | Shot 30: Decreased nl04 to 8.5 x 10^19 m^-2. EDA H-mode with ITB but disrupted at 1.18 s. |
| Mar 23 2004 03:57:12:640PM | 1040323031 | Joseph Snipes | Shot 31: Increased nl04 to 9.5 x 10^19 m^-2. Good shot. EDA with ITB from 0.6 to almost 1.2 s, then there is an H-L transition before J-port comes on. |
| Mar 23 2004 04:13:02:803PM | 1040323032 | Joseph Snipes | Shot 32: Good shot. H-L transition at 1.15 s again apparently from too much impurity accumulation. |
| Mar 23 2004 04:21:44:287PM | 1040323033 | Joseph Snipes | Shot 33: Good shot with H-mode with ITB out to 1.35 s clamped by J-port ICRF. |
| Mar 23 2004 04:41:05:910PM | 1040323034 | Joseph Snipes | Shot 34: Good shot. EDA with ITB ends at 1.12 s just before J-port comes on. |
| Mar 23 2004 04:50:01:267PM | 1040323035 | Joseph Snipes | Shot 35: Good shot. Still getting H-L transition early though. |
| Mar 23 2004 05:03:56:240PM | 1040323036 | Joseph Snipes | Shot 36: Raised nl04 to 1 x 10^20 m^-2 and returned RXL to -2 cm as it had been earlier in the day. Good shot. Neutron rate reaches 2.3 x 10^13 n/s at the peak of the ITB. |
| Mar 23 2004 07:37:58:493PM | 1040323036 | Joseph Snipes | Summary: There were 3 system test shots to start the day followed by two good plasma shots, but on the second plasma shot, the data system hung and there were two more data system test shots. All plasma attempts had successful current rises with no changes to the startup throughout the day and the machine ran very well. Only one shot disrupted early, though there were a number of disruptions following long EDA H-modes. There was difficulty coupling J-port power above 0.3 mTorr neutral pressure, so we reduced the density to lower the neutral pressure and that allowed better J-port coupling. Most shots had long EDA H-modes with ITB's and a number of shots arrested the ITB's with central RF power. One shot arrested the ITB without central RF power (1040323021) apparently due to a 5 - 12 kHz MHD mode. The last shot of the day had somewhat higher density and we returned to the triangularity of the previous good run and it had a large increase in the neutron rate during the ITB up to 2.3 x 10^13 n/s. Scorecard: 36 shots, 31 plasmas, 5 tests. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 07:03:38:007AM | Test | Ok | |
| 2 | 07:26:57:230AM | Test | Ok | |
| 3 | 07:45:18:557AM | Test | Ok | |
| 4 | 09:01:28:873AM | Plasma | Ok | |
| 5 | 09:21:56:483AM | Plasma | Ok | |
| 7 | 10:15:03:300AM | Plasma | Bad | shot cycle problem |
| 8 | 10:27:07:367AM | Plasma | Ok | |
| 9 | 10:41:18:373AM | Plasma | Ok | |
| 10 | 10:57:41:413AM | Plasma | Ok | |
| 11 | 11:12:18:653AM | Plasma | Ok | |
| 12 | 11:26:13:847AM | Plasma | Ok | |
| 13 | 11:40:34:743AM | Plasma | Ok | |
| 14 | 11:57:25:520AM | Plasma | Ok | |
| 15 | 12:11:43:463PM | Plasma | Ok | |
| 16 | 12:24:38:843PM | Plasma | Ok | |
| 17 | 12:37:25:910PM | Test | Bad | |
| 18 | 12:50:17:053PM | Plasma | Ok | |
| 19 | 01:03:18:980PM | Plasma | Ok | |
| 20 | 01:15:58:843PM | Plasma | Ok | |
| 21 | 01:28:33:427PM | Plasma | Ok | |
| 22 | 01:41:19:727PM | Plasma | Ok | |
| 23 | 01:54:57:200PM | Plasma | Ok | |
| 24 | 02:14:18:263PM | Plasma | Ok | |
| 25 | 02:27:22:987PM | Plasma | Ok | |
| 26 | 02:40:35:723PM | Plasma | Ok | |
| 27 | 02:53:52:900PM | Plasma | Ok | |
| 28 | 03:07:23:670PM | Plasma | Ok | |
| 29 | 03:23:15:807PM | Plasma | Ok | |
| 30 | 03:37:51:937PM | Plasma | Ok | |
| 31 | 03:50:35:490PM | Plasma | Ok | |
| 32 | 04:03:13:900PM | Plasma | Ok | |
| 33 | 04:15:43:137PM | Plasma | Ok | |
| 34 | 04:28:28:187PM | Plasma | Ok | |
| 35 | 04:42:04:957PM | Plasma | Ok | |
| 36 | 04:54:54:010PM | Plasma | Ok | |
| 37 | 06:43:11:817PM | Test | Ok | |
| 38 | 08:12:52:900PM | Test | Ok | |