| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Catherine Fiore |
| Physics operator(s): | Steve Wolfe |
| Engineering operator(s): | Bill Cochran,Bill Byford,Bill Parkin |
| Engineering Operator Run Comment |
| MP#341 Power Absorption in ITB |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:03:490PM |
| Author: Catherine Fiore |
| SL Fiore PO Wolfe 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. ---------------- Disappointing run. There were severe data system problems which seriously delayed the start of the run. Once we began making plasmas, we could not sustain the H-modes after the ITBs started to form. It seemed like radiation was too high. We only had a few shots to try to tune things in, however. We made no progress on MP341. Shot summary 1040310001 Data system test. Data system failure. 1040310002-1004031006 Data system tests. 1040310007 First plasma. Full RF power was not available, because we turned it off while we were sorting out the data system. Despite the lower rf power, we got several short H-modes. No ITBs. 1040310008 One good H-mode, then a back transition. An ITB was forming just before the back tranisition. 2 MW total from D and E, 0.8 MW from J port. We'll try to go to slightly more power off axis to try to optimize the ITB. 1040310009 Data system failure. We probably had a brief ITB. 1040310010-1040310012 Data system tests. 1040315013 RF power was lower than requested. H-modes with multiple back transitions. No ITB. We'll try to get the correct rf power. 1040315014 H-mode with an ITB started but it had a back transition before J-port fired. We will try a little more power from D and E. 1040315015 H-mode with an ITB started but it had a back transition before J-port fired. It lasted a little longer than the previous shot. We will try a little more power from D and E. 1040315016 Hmode with an ITB started but it had a back transition before J-port fired. We will try to fire J-port before the back transition. 1040315017 Hmode with an ITB started but it again had a back transition. This time J-port came on earlier, and did not affect the ITB rise. The radiation is higher this week than last week, and may be the critical difference. We will turn off the argon and adjust the triangularity at the same time to maximize the confusion. 1040314018 Hmode with an ITB started but it again had a back transition. J-port did not fire. Problems with FMIT 4 ends the run. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:49:507PM |
| Author: Steve Wolfe |
| Physics Operator Summary for Monday, 1040315 MP#341: Power absorption in ITB SL: Fiore PO: wolfe EO: Cochran,Byford,Parkin (the Bill's) Engineering setup: ------------------ Run begins at 09:00 (or as close as possible), ends at 17:00 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. Results ------- We got off to a late start because of a failure of the gigabit ethernet switch that connects alcdaq, alchome, alcpc1, red, daqa, cmoda, etc. to rest of the universe. This was apparently fixed at around 10:30AM, but additional computer problems prevented us from taking a successful test shot until 1:30PM. The first plasma shot was #7, taken at about 1:35PM. Computer problems continued during the run, and after shot#9 Tom again reconfigured alcdaq, this time as a single processor. In parallel, Josh brought cmodws34 over to the rack and got it ready to plug in as a replacement, as it was before the arrival of alcserv3 and alcserv4. We ran with alcdaq for the remainder of the run, with the only data problem being due to loss of another ethernet connection (see below). This does NOT mean the server problem has been fixed. We got decent ITB's but they all dropped out (H->L) around 1.1 to 1.2sec. Moving the on-axis RF earlier did not help. Neither did turning off the argon. The 2pi foil indicated radiated power up to 4MW, with a maximum power of 2.4MW from D+E. We may be ready for another boronization. After shot#16 we lost communication with pcdaqmhd1. We tried power cycling the crate in the cell, but the problem turned out to be the fiber to copper ethernet connection in the setup lab. Henry replaced the bad unit and we resumed operation. J-port (FMIT#4) had some sort of fuse loss after shot #18, and we terminated the run at 16:55. Between the computer problems and the high radiation, no progress was made on the MP today. We have scheduled another try for tomorrow. Scorecard: ---------- Tests 9 Duds 0 Fizzles 0 Plasmas 9 ------ -- shots 18 |
| Session Leader Comments | |||
| Mar 15 2004 10:27:28:293AM | Catherine Fiore | 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 15 2004 11:05:24:990AM | 1040315001 | Catherine Fiore | Data system test. Probably unsuccessful. No ITB |
| Mar 15 2004 01:37:12:627PM | 1040315007 | Catherine Fiore | First plasma. Full RF power was not available, because we turned it off while we were sorting out the data system. Despite the lower rf power, we got several short H-modes. No ITBs. |
| Mar 15 2004 02:08:07:263PM | 1040315008 | Catherine Fiore | One good H-mode, then a back transition. An ITB was forming just before the back tranisition. 2 MW total from D and E, 0.8 MW from J port. We'll try to go to slightly more power off axis to try to optimize the ITB. |
| Mar 15 2004 03:15:45:550PM | 1040315009 | Catherine Fiore | Data system failure. We probably had a brief ITB. |
| Mar 15 2004 03:23:41:143PM | 1040315013 | Catherine Fiore | RF power was lower than requested. H-modes with multiple back transitions. No ITB. We'll try to get the correct rf power. |
| Mar 15 2004 03:36:43:920PM | 1040315014 | Catherine Fiore | Hmode with an ITB started but it had a back transition before J-port fired. We will try a little more power from D and E. |
| Mar 15 2004 03:50:26:880PM | 1040315015 | Catherine Fiore | Hmode with an ITB started but it had a back transition before J-port fired. It lasted a little longer than the previous shot. We will try a little more power from D and E. |
| Mar 15 2004 04:03:23:673PM | 1040315016 | Catherine Fiore | Hmode with an ITB started but it had a back transition before J-port fired. We will try to fire J-port before the back transition. |
| Mar 15 2004 04:48:11:587PM | 1040315017 | Catherine Fiore | Hmode with an ITB started but it again had a back transition. This time J-port came on earlier, and did not affect the ITB rise. The radiation is higher this week than last week, and may be the critical difference. We will turn off the argon and adjust the triangularity at the same time to maximize the confusion. |
| Mar 16 2004 09:20:23:490AM | 1040315018 | Catherine Fiore | Hmode with an ITB started but it again had a back transition. J-port did not fire. Problems with FMIT 4 ends the run. |
| Physics Operator Comments | |||
| Mar 15 2004 10:05:50:910AM | Steve Wolfe | Delayed start due to network switch outage For first shot, I have loaded 1040309029, 0.8MA ITB from last Tuesday. | |
| Mar 15 2004 10:27:08:950AM | Steve Wolfe | Run Plan and Engineering Setup for Monday 15-Mar-2004 MP#341 Power Absorption in ITB SL: Fiore PO: wolfe Engineering setup: ------------------ Run begins at 09:00 (or as close as possible), ends at 17:00 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 15 2004 10:51:53:730AM | 1040315001 | Steve Wolfe | shot 1: No power cycle, data system test after all the computer problems this morning First try failed, bringing it around again after Henry rebooted a different switch. Second try also failed. Will try again after Tom says so. |
| Mar 15 2004 11:06:21:930AM | 1040315001 | Steve Wolfe | shot 1: Third time around at shot 1040315001 Data coming through. looks ok. No actually it got partway through and failed in store. Scopes are hanging up. next shot: We'll see ... |
| Mar 15 2004 11:47:12:337AM | 1040315002 | Steve Wolfe | shot 2: Data system test (no power). Hangs in init. Josh is typing at it. dpcs wasn't communicating; jas rebooted it. Back out of init. dpcs is fsck'ing /usr over nfs and taking a long time. Disable dpcs and try again. |
| Mar 15 2004 11:53:18:177AM | 1040315002 | Steve Wolfe | shot 2: Failed to ok check-to-pulse. No good. |
| Mar 15 2004 12:30:28:653PM | 1040315003 | Steve Wolfe | shot 3: Data test again. Not making it through init. Steve is turning off the filaments in the RF to conserve filament life. |
| Mar 15 2004 12:54:29:903PM | 1040315003 | Steve Wolfe | shot 3: Tom is running test "cycles" by hand. He seems to be slowly getting data for shot #3. |
| Mar 15 2004 01:06:19:537PM | 1040315004 | Steve Wolfe | shot 4: Tom is running test "cycles" by hand. Got pretty much all the data on shot#4 |
| Mar 15 2004 01:26:59:933PM | 1040315006 | Steve Wolfe | shot 6: No power cycle run from state got gas. Data coming through looks good. next shot: go for plasma |
| Mar 15 2004 01:37:34:627PM | 1040315007 | Steve Wolfe | shot 7: go for plasma, rf will be off while filaments warm back up. We will have D-port. plasma full length, some h-modes. No ITB. Just under 1MW from D-port only. next shot: repeat, with more RF's |
| Mar 15 2004 01:48:46:727PM | 1040315007 | Steve Wolfe | shot 8: repeat, with more RF's This shot should get D+E, still not turning on J Holding for a power room access so RF can look at #3 and 4 |
| Mar 15 2004 02:04:46:803PM | 1040315008 | Steve Wolfe | shot 8: repeat, with more RF's Prior to shot 8, cycle the dalsa routine. plasma full length, got an eda until 1.15sec, before J comes on. looks like d faulted. Got the start of an ITB, then it died. next shot: ask for a little more from D+E |
| Mar 15 2004 02:20:05:397PM | 1040315009 | Steve Wolfe | shot 9: ask for a little more from D+E plasma full length, Server hung again. We will be down for at least an hour, possibly for the rest of the day. |
| Mar 15 2004 02:50:36:220PM | 1040315011 | Steve Wolfe | shot 10: Tom is running a manual cycle again, while Josh gets cmodws34 ready to go. |
| Mar 15 2004 03:13:49:810PM | 1040315011 | Steve Wolfe | shot 13: Tom says try for a power shot. |
| Mar 15 2004 03:23:25:703PM | 1040315013 | Steve Wolfe | shot 13: Tom says try for a power shot. plasma full length. three h-modes (2 short and one long) No E-port RF , no ITB next shot: Try again, with E-port |
| Mar 15 2004 03:36:28:480PM | 1040315014 | Steve Wolfe | shot 14: Try again with E-port this time. plasma full length, drops out of eda at 1.05sec. Starting an ITB, then it drops out. next shot: try for more D+E power, drop Ar from 40->30msec |
| Mar 15 2004 03:51:13:493PM | 1040315015 | Steve Wolfe | shot 15: try for more D+E power, drop Ar from 40->30msec plasma full length. eda to 1.17sec ITB is just starting. next shot: More from D+E |
| Mar 15 2004 04:02:27:860PM | 1040315016 | Steve Wolfe | shot 16: More from D+E plasma full length, eda to 1.14sec next shot: bring J-port on earlier |
| Mar 15 2004 04:41:18:980PM | 1040315017 | Steve Wolfe | shot 17: bring J-port on earlier Prior to this shot, we lost connection to pcdaqmhd1. Rebooting in the cell did not help. It turned out to be a bad fiber to copper ethernet connection in the setup lab. Henry replaced it and we're ready to try a shot. plasma full length, eda dies at almost exactly the same time. next shot: turn off the argon. |
| Mar 15 2004 04:56:15:087PM | 1040315018 | Steve Wolfe | shot 18: turn off the argon. Also, decrease triang (rxl from -.02 to -.01) plasma full length, eda/itb ends at 1.11; there's also a second ITB. No J-port. Screen trip on #4. RF'ers are investigating |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 10:59:44:900AM | Test | Ok | |
| 3 | 12:41:59:677PM | Test | Bad | |
| 5 | 01:10:27:620PM | Test | Ok | |
| 6 | 01:19:30:030PM | Test | Ok | |
| 7 | 01:30:46:427PM | Plasma | Ok | |
| 8 | 01:57:19:320PM | Plasma | Ok | |
| 9 | 02:11:47:910PM | Plasma | Ok | |
| 10 | 02:43:48:677PM | Test | Bad | |
| 11 | 02:48:04:620PM | Test | Bad | |
| 13 | 03:16:16:707PM | Plasma | Ok | |
| 14 | 03:28:45:840PM | Plasma | Ok | |
| 15 | 03:44:37:027PM | Plasma | Ok | |
| 16 | 03:58:48:227PM | Plasma | Ok | |
| 17 | 04:36:25:703PM | Plasma | Ok | |
| 18 | 04:49:19:290PM | Plasma | Ok | |