| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Catherine Fiore |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Gary Dekow,Bill Byford |
| Engineering Operator Run Comment |
| MP 341 Power Absorption in ITB SL: C. Fiore, PO: R. Grantz, EO: Dekow,By |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:03:507PM |
| Author: Catherine Fiore |
| SL Fiore PO Granetz 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. ---------------------------------------------------------------------------- The PhysOp showed up with his snowboard and boots, ski helmet and goggles, prepared to head for the hills the minute it started to snow. This obviously caused the run to be plagued with data system problems as it had on Monday. The porblems persisted until it started to snow late in the day. We were able to make ITBs when we did have shots, but they had problems with excess radiation which caused premature back transitions. Since we need to maximize the core power for this run, it is clear that we should boronize before attempting it again. We were not able to get as much central ICRF power in before destroying the ITB as we had in the run from 1040309, suggesting that the impurities and radiated power may be a contributing factor in limiting our ability to stabilize and hold the ITB at high central power. Shot summary: 1040316001 A good ITB develops but terminates in a back transition at 1.2 s. The 70 Mhz power did not come on. 1040316002 A good ITB develops and the 70 Mhz central heating came on at 1 s with 0.8 MW. The ITB continued to grow until it ended in a back transition at 1.15 s. The plasma disrupted at 1.4 s. 1040316003 The plasma disrupted right after it went into H-mode. 1040316004 Hmode with many back transitions. No ITB. 1040316005 Beginning of data system problems. Not much of the data was actually stored. 1040316006 Hmode with many back transitions. Not all of the data was recorded. 1040316007-1040316010 Data system recovery. I just tried to look at what was in the tree for shot 7 and it closed my scope. 1040316011 Ohmic plasma. No H-mode. We did not turn on the rf filaments in time to have power for this shot. 1040316012 H-mode with ITB starting but ends in a back transition. Similar to earlier shots today. 1040316013 H-mode with ITB , probably clamped by central ICRF. 1040316014 H-mode with ITB , but the central ICRF wiped it out. We will make them fire later at t=1.2 s. 1040316015 H-mode with ITB , but disrupted when the central ICRF came on. We will fire the central rf at 1.1s 1040316016 H-mode with ITB , but it had a back transition just after the central ICRF came on. We will fire the central rf at 1.s again. 1040316017 H-mode with ITB , but the central ICRF at 1MW blew it away. We will increase the target density to 1.2 10^20 1040316018 An H-mode with ITB formed but the rf had trouble with the higher target density and was not able to stay on. The central rf did not come on at all. We will have to decrease the target density to recover, and try to back off on the central ICRF power in order to preserve the ITB. 1040316019 An H-mode with ITB develops but it is destroyed by the central ICRF at 1.MW. 1040316020 An H-mode with ITB develops but it back transitions just as the central ICRF is turned on. 1040316021 An H-mode with ITB develops but is wiped out by central ICRF power at 1 MW. |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:49:520PM |
| Author: Robert Granetz |
| Physics operator summary for run 1040316 (Tuesday): MP 341 -- Power Absorption in ITBs Session leader: C. Fiore Physics operator: R. Granetz Summary: We lost about half the day to computer problems. But even with the reduced run time, we got a very clear result on the mini-proposal: with the present machine conditions, the operating parameter space (Prf on-axis, target density, RF turn-on time) is very tiny...basically just a single set of operating conditions. See the session leader's summary for more details. When the computers ran okay, the machine performed well. There were no fizzles. We did struggle with a high TF resistance reading, which may or may not be real. One of the BP_JK magnetics signals had a consistently high baseline offset, and we'll have to check into it on the next maintenance day. It's not used in the hybrid, so it didn't affect the run. Scorecard: 16 plasmas 0 fizzles 0 duds (no TF) 5 tests or no-power shot cycles 0 aborted and/or screwed up by computer problems 0 beam-into-gas calibration shots with B-field(s) ---------- 21 total ------------------------------------------------------------------------------- Engineering setup for Tuesday, 16 Mar 2004 MP 341: Power Absorption in ITB Session leader: C. Fiore Physics operator: R. Granetz 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 1040315016 (0.8 MA, 4.5 T, lower X-point) A-coils should be disabled. 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) Disable NINJA Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB Necessary diagnostics: Standard core profile diagnostics, specifically including Hirex (for Ti profiles and rotation), core TS, VB, GPC 1 and 2, FRC ECE, neutrons Desirable diagnostics: DNB and all beam diagnostics ------------------------------------------------------------------------------- RF Setup: All four transmitters in RUN-ON by 08:00 ------------------------------------------------------------------------------- Run Plan: Finish off the MP begun yesterday (1040315). Specifically, we still need to determine the highest on-axis power we can use without destroying the high-field side resonance ITB (4.5 T), and document the confinement properties. If we complete the 4.5 T experiments, we can then proceed to the low-field side resonance, using the 70 MHz for off-axis heating at 5.6 T and 80 MHz on-axis. We will start with a shot like 1040315016, which had 2.5 MW of off-axis 80 MHz and 0.8 MW of on-axis 70 MHz. 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. ------------------------------------------------------------------------------- ECDC was done overnight, but no bake. Hybrid coldstart done by the engineering group; no errors found Loaded PCS from shot 1040315016 (all segments) ------------------------------------------------------------------------------- The start of the run will be delayed in order to repair some RF equipment. Shot 01 -- Plasma. Good shot. 0.8 MA, 4.5 T. 2.5 MW of 80 MHz (off-axis, high-field side), 0 MW of 70 MHz (on-axis). There was a weak ITB until t=1.2 s. Next shot: turn on J-port RF at t=1.1 s to provide on-axis heating. Shot 02 -- Plasma. Disrupted at t=1.4 s. TCI failed during the shot, but it didn't have anything to do with the disruption. Prf=2.5 MW off-axis and 0.75 MW on-axis. The on-axis RF starts at t=1.0 s, not 1.1 s. ITB forms, and the peaking is arrested by the on-axis heating (as seen on Catherine's ratio of central Dalsa to outer Dalsa). Next shot: try reducing the density by 10% (1.0 -> 0.9e20 m-2). Leave on-axis RF start time at t=1.0 s. Also, at Jim Irby's request, I've added an 0.5 s flat porch onto the TF trace from t=2.38-2.88 s at 50 kA. Shot 03 -- Plasma. Disrupted at t=0.9 s. Radiated power problem? Injection? Next shot: at Steve's suggestion, move RXL out by 1 cm, on order to avoid possible touching of the inboard limiter edge. Shot 04 -- Plasma. Good shot. Looks like the RXL tweak got rid of the disruption. Lots of back transitions due to RF faults. Got a brief ITB during the first EDA. Next shot: improve RF tuning. The run will be delayed in order to change over some TF resistance taps. Shot 05 -- Test. No-power shot cycle. The computers are crashing. Shot 06 -- Plasma. Good shot. Lots of short EDA's and back transitions. Prf=2.5 MW off-axis, 0.75 MW on-axis. Lots of data acquisition problems. Next shot: back off 0.5 cm on the earlier RXL tweak (i.e. subtract 0.5 cm from RXL). We are having an extended delay to work on the computers. Shot 07 -- Test (maybe...not sure what the shot number is). Shot 08 -- Test (maybe...not sure what the shot number is). Shot 09 -- Test (maybe...not sure what the shot number is). Shot 10 -- Test (maybe...not sure what the shot number is). Shot 11 -- Plasma. Good shot. Ohmic. Looks like all the data came through. TF resistance data looks very good (1.2 micro ohms). Next shot: add another 0.25 s to the TF back porch flattop. Turn RF back on. Shot 12 -- Plasma. Good shot. Prf=2.5 MW off-axis, 0.8 MW on-axis. I think we had an ITB, but there's no TS data on this shot. Next shot: increase density to 1.1e20 m-2. Shot 13 -- Plasma. Good shot. Prf=2.5 MW off-axis, 0.8 MW on-axis. I think we had a better ITB, but again there's no TS data. We've left messages for Jerry Hughes and Dmitri to turn the TS back on. Dalsa shows clear peaking. Next shot: increase 70 MHz (on-axis) power to 1 MW (from 0.8 MW) Shot 14 -- Plasma. Good shot. Prf=2.5 NW off-axis, 1.0 MW on-axis. This was enough central power to kill the ITB. Next shot: delay the start of the on-axis RF until t=1.2 s (had been starting at 1.0 s) Shot 15 -- Plasma. Disrupted at t=1.21 s, probably because the ITB was allowed to go to 1.2 s before on-axis heating was turned on. Next shot: move start time of on-axis RF to t=1.1 s. Shot 16 -- Plasma. Good shot. On-axis RF starts at t=1.1 s. The ITB does not stop rising, however, and eventually it back-transitions. Next shot: move start time of on-axis RF back to 1.0 s. Shot 17 -- Plasma. Good shot. Exactly the same RF timing and power as on shot 14, with exactly the same result...a MW of on-axis RF kills the ITB. Next shot: raise nl_04 to 1.2e20 m-2 (from 1.1e20) Shot 18 -- Plasma. Disrupted at t=1.4 s. Got the higher target density, and the ITB lasted longer. The on-axis RF didn't come on, so the ITB eventually disrupted the plasma, similar to earlier shots today. Next shot: reduce the density back to 1.1e20 m-2 and reduce the on-axis RF power to 0.9 MW. Shot 19 -- Plasma. Good shot. On-axis RF power of 0.9 MW was enough to arrest the ITB. Next shot: reduce on-axis RF power to 0.8 MW, which previously did not arrest the ITB, thus resulting in a radiative disruption. Shot 20 -- Plasma. Good shot. Prf off-axis=2.6 MW, Prf on-axis=0.84 MW. Strange result...the ITB collapsed just as the on-axis RF was turning on. Next shot: repeat with no changes Shot 21 -- Plasma. Good shot. Prf off-axis=2.6 MW, Prf on-axis=0.84 MW. This was enough to arrest the ITB. End of run. |
| Session Leader Comments | |||
| Mar 16 2004 09:31:17:553AM | 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 16 2004 12:20:18:457PM | 1040316001 | Catherine Fiore | test |
| Mar 16 2004 02:36:23:970PM | 1040316011 | Catherine Fiore | Ohmic plasma. The rf did not have enought time to warm up their filaments after the shut down for data system repair. |
| Mar 16 2004 02:54:13:677PM | 1040316012 | Catherine Fiore | H-mode with ITB starting but ends in a bac transition. Similar to earlier shots today. |
| Mar 16 2004 03:19:20:910PM | 1040316013 | Catherine Fiore | H-mode with ITB , probably clamped by central ICRF. |
| Mar 16 2004 03:24:16:750PM | 1040316014 | Catherine Fiore | H-mode with ITB , but the central ICRF wiped it out. We will make them fire later at t=1.2 s. |
| Mar 16 2004 03:36:54:383PM | 1040316015 | Catherine Fiore | H-mode with ITB , but disrupted when the central ICRF came on. We will fire the central rf at 1.1s |
| Mar 16 2004 03:55:10:903PM | 1040316016 | Catherine Fiore | H-mode with ITB , but it had a back transition just after the central ICRF came on. We will fire the central rf at 1.s again. |
| Mar 16 2004 04:04:58:203PM | 1040316017 | Catherine Fiore | H-mode with ITB , but the central ICRF blew it away. We will increase the target density to 1.2 10^20 |
| Mar 16 2004 04:17:03:523PM | 1040316018 | Catherine Fiore | H-mode with ITB , but no central ICRF. |
| Physics Operator Comments | |||
| Mar 15 2004 04:36:53:220PM | Robert Granetz | Engineering setup for Tuesday, 16 Mar 2004 MP 341: Power Absorption in ITB Session leader: C. Fiore Physics operator: R. Granetz 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 1040315016 (0.8 MA, 4.5 T, lower X-point) A-coils should be disabled. 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) Disable NINJA Enable the following gate valves, assuming no vacuum problems: ECE, VUV, DNB Necessary diagnostics: Standard core profile diagnostics, specifically including Hirex (for Ti profiles and rotation), core TS, VB, GPC 1 and 2, FRC ECE, neutrons Desirable diagnostics: DNB and all beam diagnostics ------------------------------------------------------------------------------- RF Setup: All four transmitters in RUN-ON by 08:00 ------------------------------------------------------------------------------- Run Plan: Finish off the MP begun yesterday (1040315). Specifically, we still need to determine the highest on-axis power we can use without destroying the high-field side resonance ITB (4.5 T), and document the confinement properties. If we complete the 4.5 T experiments, we can then proceed to the low-field side resonance, using the 70 MHz for off-axis heating at 5.6 T and 80 MHz on-axis. We will start with a shot like 1040315016, which had 2.5 MW of off-axis 80 MHz and 0.8 MW of on-axis 70 MHz. 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. | |
| Mar 16 2004 08:34:27:747AM | Robert Granetz | ECDC was done overnight, but no bake. Hybrid coldstart done by the engineering group; no errors found Loaded PCS from shot 1040315016 (all segments) | |
| Mar 16 2004 08:56:59:767AM | Robert Granetz | The start of the run will be delayed in order to repair some RF equipment. | |
| Mar 16 2004 10:00:20:823AM | 1040316001 | Robert Granetz | Shot 01 -- Plasma. Good shot. 0.8 MA, 4.5 T. 2.5 MW of 80 MHz (off-axis, high-field side), 0 MW of 70 MHz (on-axis). There was a weak ITB until t=1.2 s. Next shot: turn on J-port RF at t=1.1 s to provide on-axis heating. |
| Mar 16 2004 10:31:04:827AM | 1040316002 | Robert Granetz | Shot 02 -- Plasma. Disrupted at t=1.4 s. TCI failed during the shot, but it didn't have anything to do with the disruption. Prf=2.5 MW off-axis and 0.75 MW on-axis. The on-axis RF starts at t=1.0 s, not 1.1 s. ITB forms, and the peaking is arrested by the on-axis heating (as seen on Catherine's ratio of central Dalsa to outer Dalsa). Next shot: try reducing the density by 10% (1.0 -> 0.9e20 m-2). Leave on-axis RF start time at t=1.0 s. Also, at Jim Irby's request, I've added an 0.5 s flat porch onto the TF trace from t=2.38-2.88 s at 50 kA. |
| Mar 16 2004 10:47:22:463AM | 1040316003 | Robert Granetz | Shot 03 -- Plasma. Disrupted at t=0.9 s. Radiated power problem? Injection? Next shot: at Steve's suggestion, move RXL out by 1 cm, on order to avoid possible touching of the inboard limiter edge. |
| Mar 16 2004 11:16:13:330AM | 1040316004 | Robert Granetz | The run will be delayed in order to change over some TF resistance taps. |
| Mar 16 2004 12:22:55:517PM | 1040316005 | Robert Granetz | Shot 05 -- Test. No-power shot cycle. The computers are crashing. |
| Mar 16 2004 12:34:27:243PM | 1040316006 | Robert Granetz | Shot 06 -- Plasma. Good shot. Lots of short EDA's and back transitions. Prf=2.5 MW off-axis, 0.75 MW on-axis. Lots of data acquisition problems. Next shot: back off 0.5 cm on the earlier RXL tweak (i.e. subtract 0.5 cm from RXL). |
| Mar 16 2004 01:10:17:340PM | 1040316006 | Robert Granetz | We are having an extended delay to work on the computers. |
| Mar 16 2004 01:51:56:183PM | 1040316006 | Robert Granetz | Shot 07 -- Test (maybe...not sure what the shot number is). |
| Mar 16 2004 02:06:11:420PM | 1040316006 | Robert Granetz | Shot 08 -- Test (maybe...not sure what the shot number is). |
| Mar 16 2004 02:06:19:517PM | 1040316006 | Robert Granetz | Shot 09 -- Test (maybe...not sure what the shot number is). |
| Mar 16 2004 02:25:41:653PM | 1040316010 | Robert Granetz | Shot 10 -- Test (maybe...not sure what the shot number is). |
| Mar 16 2004 02:42:51:140PM | 1040316011 | Robert Granetz | Shot 11 -- Plasma. Good shot. Ohmic. Looks like all the data came through. TF resistance data looks very good (1.2 micro ohms). Next shot: add another 0.25 s to the TF back porch flattop. Turn RF back on. |
| Mar 16 2004 02:53:56:660PM | 1040316012 | Robert Granetz | Shot 12 -- Plasma. Good shot. Prf=2.5 MW off-axis, 0.8 MW on-axis. I think we had an ITB, but there's no TS data on this shot. Next shot: increase density to 1.1e20 m-2. |
| Mar 16 2004 04:58:47:103PM | 1040316013 | Robert Granetz | Shot 13 -- Plasma. Good shot. Prf=2.5 MW off-axis, 0.8 MW on-axis. I think we had a better ITB, but again there's no TS data. We've left messages for Jerry Hughes and Dmitri to turn the TS back on. Dalsa shows clear peaking. Next shot: increase 70 MHz (on-axis) power to 1 MW (from 0.8 MW) |
| Mar 16 2004 04:59:00:447PM | 1040316014 | Robert Granetz | Shot 14 -- Plasma. Good shot. Prf=2.5 NW off-axis, 1.0 MW on-axis. This was enough central power to kill the ITB. Next shot: delay the start of the on-axis RF until t=1.2 s (had been starting at 1.0 s) |
| Mar 16 2004 04:59:39:230PM | 1040316015 | Robert Granetz | Shot 15 -- Plasma. Disrupted at t=1.21 s, probably because the ITB was allowed to go to 1.2 s before on-axis heating was turned on. Next shot: move start time of on-axis RF to t=1.1 s. |
| Mar 16 2004 05:00:08:950PM | 1040316016 | Robert Granetz | Shot 16 -- Plasma. Good shot. On-axis RF starts at t=1.1 s. The ITB does not stop rising, however, and eventually it back-transitions. Next shot: move start time of on-axis RF back to 1.0 s. |
| Mar 16 2004 05:00:47:747PM | 1040316017 | Robert Granetz | Shot 17 -- Plasma. Good shot. Exactly the same RF timing and power as on shot 14, with exactly the same result...a MW of on-axis RF kills the ITB. Next shot: raise nl_04 to 1.2e20 m-2 (from 1.1e20) |
| Mar 16 2004 05:01:14:763PM | 1040316018 | Robert Granetz | Shot 18 -- Plasma. Disrupted at t=1.4 s. Got the higher target density, and the ITB lasted longer. The on-axis RF didn't come on, so the ITB eventually disrupted the plasma, similar to earlier shots today. Next shot: reduce the density back to 1.1e20 m-2 and reduce the on-axis RF power to 0.9 MW. |
| Mar 16 2004 05:01:38:983PM | 1040316019 | Robert Granetz | Shot 19 -- Plasma. Good shot. On-axis RF power of 0.9 MW was enough to arrest the ITB. Next shot: reduce on-axis RF power to 0.8 MW, which previously did not arrest the ITB, thus resulting in a radiative disruption. |
| Mar 16 2004 05:02:08:453PM | 1040316020 | Robert Granetz | Shot 20 -- Plasma. Good shot. Prf off-axis=2.6 MW, Prf on-axis=0.84 MW. Strange result...the ITB collapsed just as the on-axis RF was turning on. Next shot: repeat with no changes |
| Mar 16 2004 04:56:07:300PM | 1040316021 | Robert Granetz | Shot 21 -- Plasma. Good shot. Prf off-axis=2.6 MW, Prf on-axis=0.84 MW. This was enough to arrest the ITB. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:49:39:067AM | Plasma | Ok | |
| 2 | 10:10:12:743AM | Plasma | Ok | |
| 3 | 10:33:53:743AM | Plasma | Ok | |
| 4 | 10:50:55:150AM | Plasma | Ok | |
| 5 | 11:42:30:483AM | Plasma | Bad | Igor Failure |
| 6 | 12:06:00:547PM | Plasma | Ok | |
| 10 | 02:18:56:677PM | Test | Ok | |
| 11 | 02:30:46:380PM | Plasma | Ok | |
| 12 | 02:45:17:050PM | Plasma | Ok | |
| 13 | 02:58:17:357PM | Plasma | Ok | |
| 14 | 03:17:19:940PM | Plasma | Ok | |
| 15 | 03:30:29:323PM | Plasma | Ok | |
| 16 | 03:43:29:193PM | Plasma | Ok | |
| 17 | 03:58:06:300PM | Plasma | Ok | |
| 18 | 04:11:44:887PM | Plasma | Ok | |
| 19 | 04:24:44:413PM | Plasma | Ok | |
| 20 | 04:37:43:500PM | Plasma | Ok | |
| 21 | 04:50:36:447PM | Plasma | Ok | |
| 22 | 05:29:11:677PM | Test | Bad | |
| 23 | 05:32:48:120PM | Test | Bad | |
| 24 | 05:38:33:320PM | Test | Bad | |
| 25 | 05:44:00:250PM | Test | Bad | |
| 26 | 05:49:26:420PM | Test | Bad | |