| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Martin Greenwald |
| Physics operator(s): | Bill Rowan |
| Engineering operator(s): | Bill Parkin,Ed Fitzgerald,Gary Dekow |
| Engineering Operator Run Comment |
| MP#312 or #304;SL:Lee or Greenwald; PO:Rowan; EO:Dekow/Fitz/Parkin |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:30:897PM |
| Author: To Be Determined |
| Run Summary for 1020930 mp 304 H-mode regimes Session Leader - Greenwald Phys Op - Rowan ============================ Plan: Given machine constraints, Emphasis will be on the EDA/ELMfree boundary as a function of delta. The hope is that the loose tile will not cause too much trouble. Even this study will be constrained because of limits on plasma current. The overall strategy is to pick a triangularity, get an H-mode. If it is EDA, we scan up in current (down in q) till the discharge goes ELMfree. If it is ELMfree, we scan down in current till it goes EDA. Then go to next value of triangularity. - start at the highest triangularity, maybe delta_av = 0.7, then scan to 0.55 and 0.35. If time permits (hah!) we'll try to fill in. a possible shot to start with would be 1020625021, though we probably need to back of slightly on the upper triangularity to avoid double null. - Bt = 5.3 or whatever value it is these days that puts the D&E antennas squarely on the magnetic axis - no power scans - steady power at about 2 MW - start at 1 MA for the high triangularity. we can probably drop the base current as the triangularity is lowered. ============================== Results: Less than exciting. The early part of the run was plagued by fizzles, then on shot 17 we had a fault in a commutation capacitor which ended the run. We got the start of our scan on shots 11 and 15. These were EDA (First data this campaign with the PCI) at q95 = 5.3 and delta_av = 0.56. This is entirely consistent with previous scans, but did not expand our database. ================================ |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:16:350PM |
| Author: To Be Determined |
Engineering setup for Monday, September 30th, Run 1020930 Either MP#312 or #304 depending on the availability of PCI If PCI is available, then MP 304. MP#312 Toroidal Rotation Profiles in Ohmic H-modes Session Leader: Mr. Lee Physics Operator: Rowan MP#304 H-mode regimes Session leader: Greenwald Physics Operator: Rowan For the experiment, use segment 2 of 1020625021 and segment 1 of a more recent shot for breakdown. The overall strategy is to pick a triangularity, get an H-mode. If it is EDA, we scan up in current (down in q) till the discharge goes ELMfree. If it is ELMfree, we scan down in current till it goes EDA. Then choose a new value of triangularity. ECDC overnight in D2 stopping by 07:00 on Monday morning.. Bake at 60C Set up for possible ECDC in D2 between shots. Power systems as on 1020925007 Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) leave J-Bottom as is Hybrid DISABLED (PG5) Enable the following gate valves: ECE, VUV, DNB ------------------------------------------------------------------------------- RF Setup: FMIT#1 and 2 transmitters in Run On by 08:00 ------------------------------------------------------------------------------- ------------------------------------------------------------------------------ Results ------------------------------------------------------------------------------ Just one pump station was in operation for this run. Pumpdown after a plasma shot and after between-shot-ECDC was slow. The breakdown was taken from shot 1020927032. After 100 ms (segement 2), the setup for shot 1020625021 was used at the suggestion of the SL. Triangularity scan------------------------------------------------------------ ZXU was increased from the starting point of 0.015 m to avoid double null. The last value used for a plasma shot was 0.030. That value is too high for this experiment and had the run continued, it would have been reduced. ZCUR was lowered to -0.015. In the reference shot, ZCUR was set for approximately 0. Breakdown and early current rise---------------------------------------------- There were significant problems here. Although the initial fields seemed close enough, there were duds. The pressure was slightly high but within a tolerable range. Careful matching of BR_0, BZ_0 and prefill pressure at 5 ms to the shot 1020927032 did result in a breakdown, but a few more shots would be needed before concluding that these settings would produce a stable breakdown and current rise. Engineering problems---------------------------------------------------------- Failure of a cap in OH2L resulted in the run ending early. ------------------------------------------------------------------------------ Copy of logbook entries ------------------------------------------------------------------------------ Engineering setup for Monday, September 30th, Run 1020930 Either MP#312 or #304 depending on the availability of PCI If PCI is available, then MP 304. MP#312 Toroidal Rotation Profiles in Ohmic H-modes Session Leader: Mr. Lee Physics Operator: Rowan MP#304 H-mode regimes Session leader: Greenwald Physics Operator: Rowan For the experiment, use segment 2 of 1020625021 and segment 1 of a more recent shot for breakdown. The overall strategy is to pick a triangularity, get an H-mode. If it is EDA, we scan up in current (down in q) till the discharge goes ELMfree. If it is ELMfree, we scan down in current till it goes EDA. Then choose a new value of triangularity. ECDC overnight in D2 stopping by 07:00 on Monday morning.. Bake at 60C Set up for possible ECDC in D2 between shots. Power systems as on 1020925007 Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) leave J-Bottom as is Hybrid DISABLED (PG5) Enable the following gate valves: ECE, VUV, DNB ------------------------------------------------------------------------------- RF Setup: FMIT#1 and 2 transmitters in Run On by 08:00 ------------------------------------------------------------------------------- started pcs loaded 1020927032. Will use this for the breakdown imported segment 2 from 1020625021 to meet requirements for the run Did a load/clean Load at 30-Sep-2002 09:30:48.0 Did a cold start rtnode -- data loaded, A matrix responds rtnode -- data loaded, M matrix responds rtnode -- data loaded, PID matrix responds RT_NODE Done 30-SEP-2002 09:33:30.14 doing TCL command TYPE *************** END COLD START ****************** *************** END COLDSTART ****************** 001-004 engineering testss 005. Dud Next shot. Raise BZ by approximately 1 mT. Increased IC_ef4 from -1330 to -1315 Lowered BR_0 by 0.5 mT. Offset changed from 0.002 to 0.0015 Added 1 ms of prefill. PG4. Makes it 29 ms. 006. Dud. Next shot. Increased the gas fill again. PG$ is notw 30 ms. 007. Dud. Nest shot. ECDC for 10 minutes before the next shot. 008. Plasma. Low density. Copied shot requested it. Next shot. Increase NL_04 from 0.3e20 demand to 1.0e20 demand. 009. PlasmaN Next shot. Moved zxu out by 1.5 cm to get rid of double null Also moved zcur to -0.015 instead of the 0 in the last shot. 010. Fizzle Next shot. Added 2 ms to the gas feed Increase BZ_0 by 0.5 mT. 011. Plasma. SL wants more triangularity Next shot. Moved zxu back in by approximately 0.5 cm. 012. Fizzle Next shot. ECDC before the next shot. 013. Fizzle. Next shot. Decrease BZ-) by 1 mT Decreaed the prefill by 1 ms. This was actually high on shot 012 as well. 014. Fizzle Next shot. Increase BR-0 by 0.5 mT to match the breakdown of the last shots on Friday. 015. Plasma, finally. Next shot. moved zxu from 0.03 tp 0.027. This is more sensitive than I thought. 016. Fizzle. The pressure on this shot is slightly higher on this shot than on 1020927032. Next shot. Reduce the prefill by 2 ms. PG4 is now 29 ms. 017. Fizzle. Commutation failure on OH2L Engineers supect a blown switch SCR if that is the case. Delay for at least an hour. Next shot: no changes The run is ended. There is a short in one of the caps in OH2L. |
| Session Leader Comments | |||
| Sep 30 2002 09:59:45:170AM | Martin Greenwald | Background The "baseline" operating regime for proposed burning plasma experiments is an ELMy H-mode. Standard H-mode operation for most tokamaks includes large type I ELMs which can cause unacceptably high peak heat loads on the first wall. There is a need to identify and characterize regimes without large ELMs but which do have good H-mode confinement (that is with a large edge pedestal temperature and pressure) On C-Mod, we have achieved such regimes with the EDA and type II ELMy discharges. We now must understand the physics of these regimes sufficiently to assess their potential for extrapolation into the reactor regime. The aim of the experimental proposal is to to identify the critical physics parameters which define the various regimes. Data from these experiments would be used for comparison with theoretical models of micro and macro stability. Plan Given machine constraints, I think what we can do is to look for the EDA/ELMfree boundary as a function of delta. The hope is that the loose tile will not cause too much trouble. Even this study will be constrained because of limits on plasma current. The overall strategy is to pick a triangularity, get an H-mode. If it is EDA, we scan up in current (down in q) till the discharge goes ELMfree. If it is ELMfree, we scan down in current till it goes EDA. Then go to next value of triangularity. - start at the highest triangularity, maybe delta_av = 0.7, then scan to 0.55 and 0.35. If time permits (hah!) we'll try to fill in. a possible shot to start with would be 1020625021, though we probably need to back of slightly on the upper triangularity to avoid double null. - Bt = 5.3 or whatever value it is these days that puts the D&E antennas squarely on the magnetic axis - no power scans - steady power at about 2 MW - start at 1 MA for the high triangularity. we can probably drop the base current as the triangularity is lowered. | |
| Sep 30 2002 10:20:43:730AM | 1020930006 | Martin Greenwald | Dud |
| Sep 30 2002 10:50:57:543AM | 1020930007 | Martin Greenwald | Dud |
| Sep 30 2002 11:05:09:830AM | 1020930008 | Martin Greenwald | Plasma - very low density below H-mode threshold raise for next shot |
| Sep 30 2002 11:20:34:510AM | 1020930009 | Martin Greenwald | Plasma RF power only 1 MW, no H-mode |
| Sep 30 2002 11:32:46:560AM | 1020930010 | Martin Greenwald | fizzle |
| Sep 30 2002 11:52:34:373AM | 1020930011 | Martin Greenwald | Plasma H-mode QC mode seen on PCI delta_av = 0.56 delta_l = 0.4 delta_u = 0.7 q95 = 5.3 |
| Sep 30 2002 12:05:49:580PM | 1020930012 | Martin Greenwald | fizzle |
| Sep 30 2002 12:24:54:843PM | 1020930013 | Martin Greenwald | fizzle |
| Sep 30 2002 12:49:56:163PM | 1020930014 | Martin Greenwald | fizzle |
| Sep 30 2002 01:00:24:540PM | 1020930015 | Martin Greenwald | H-mode QC mode seen on PCI delta_av = 0.56 delta_u = 0.4 delta_l = 0.7 q95 = 5.3 |
| Sep 30 2002 01:18:50:160PM | 1020930016 | Martin Greenwald | fizzle |
| Sep 30 2002 01:32:27:417PM | 1020930017 | Martin Greenwald | fizzle |
| Physics Operator Comments | |||
| Sep 30 2002 09:19:53:217AM | Bill Rowan | ngineering setup for Monday, September 30th, Run 1020930 Either MP#312 or #304 depending on the availability of PCI If PCI is available, then MP 304. MP#312 Toroidal Rotation Profiles in Ohmic H-modes Session Leader: Mr. Lee Physics Operator: Rowan MP#304 H-mode regimes Session leader: Greenwald Physics Operator: Rowan For the experiment, use segment 2 of 1020625021 and segment 1 of a more recent shot for breakdown. The overall strategy is to pick a triangularity, get an H-mode. If it is EDA, we scan up in current (down in q) till the discharge goes ELMfree. If it is ELMfree, we scan down in current till it goes EDA. Then choose a new value of triangularity. ECDC overnight in D2 stopping by 07:00 on Monday morning.. Bake at 60C Set up for possible ECDC in D2 between shots. Power systems as on 1020925007 Gas setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid enabled (PG1) fill B-side upper with 10 psi D2 Hybrid DISABLED (PG2) (for ECDC) fill C-side with 30 psi D2 Hybrid enabled (PG3) leave J-Bottom as is Hybrid DISABLED (PG5) Enable the following gate valves: ECE, VUV, DNB ------------------------------------------------------------------------------- RF Setup: FMIT#1 and 2 transmitters in Run On by 08:00 ------------------------------------------------------------------------------- | |
| Sep 30 2002 09:38:32:043AM | Bill Rowan | started pcs loaded 1020927032. Will use this for the breakdown imported segment 2 from 1020625021 to meet requirements for the run Did a load/clean Load at 30-Sep-2002 09:30:48.0 Did a cold start rtnode -- data loaded, A matrix responds rtnode -- data loaded, M matrix responds rtnode -- data loaded, PID matrix responds RT_NODE Done 30-SEP-2002 09:33:30.14 doing TCL command TYPE *************** END COLD START ****************** *************** END COLDSTART ****************** | |
| Sep 30 2002 10:17:20:163AM | Bill Rowan | 005. Dud Next shot. Raise BZ by approximately 1 mT. Increased IC_ef4 from -1330 to -1315 Lowered BR_0 by 0.5 mT. Offset changed from 0.002 to 0.0015 Added 1 ms of prefill. PG4. Makes it 29 ms. | |
| Sep 30 2002 10:29:13:197AM | Bill Rowan | 006. Dud. Next shot. Increased the gas fill again. PG$ is notw 30 ms. | |
| Sep 30 2002 10:38:42:070AM | 1020930007 | Bill Rowan | 007. Dud. Nest shot. ECDC for 10 minutes before the next shot. |
| Sep 30 2002 11:06:20:677AM | 1020930008 | Bill Rowan | 008. Plasma. Low density. Copied shot requested it. Next shot. Increase NL_04 from 0.3e20 demand to 1.0e20 demand. |
| Sep 30 2002 11:26:15:833AM | 1020930009 | Bill Rowan | 009. PlasmaN Next shot. Moved zxu out by 1.5 cm to get rid of double null Also moved zcur to -0.015 instead of the 0 in the last shot. |
| Sep 30 2002 11:40:01:760AM | 1020930010 | Bill Rowan | 010. Fizzle Next shot. Added 2 ms to the gas feed Increase BZ_0 by 0.5 mT. |
| Sep 30 2002 11:53:30:937AM | 1020930011 | Bill Rowan | 011. Plasma. SL wants more triangularity Next shot. Moved zxu back in by approximately 0.5 cm. |
| Sep 30 2002 12:04:55:313PM | 1020930012 | Bill Rowan | 012. Fizzle Next shot. ECDC before the next shot. |
| Sep 30 2002 12:31:51:493PM | 1020930013 | Bill Rowan | 013. Fizzle. Next shot. Decrease BZ-) by 1 mT Decreaed the prefill by 1 ms. This was actually high on shot 012 as well. |
| Sep 30 2002 12:51:59:103PM | 1020930014 | Bill Rowan | 14. Fizzle Next shot. Increase BR-0 by 0.5 mT to match the breakdown of the last shots on Friday. |
| Sep 30 2002 01:01:53:027PM | 1020930015 | Bill Rowan | 015. Plasma, finally. Next shot. moved zxu from 0.03 tp 0.027. This is more sensitive than I thought. |
| Sep 30 2002 01:28:18:957PM | 1020930016 | Bill Rowan | 016. Fizzle. The pressure on this shot is slightly higher on this shot than on 1020927032. Next shot. Reduce the prefill by 2 ms. PG4 is now 29 ms. |
| Sep 30 2002 01:49:59:680PM | 1020930017 | Bill Rowan | 017. Fizzle. Commutation failure on OH2L Next shot: no changes |
| Sep 30 2002 02:01:45:057PM | 1020930017 | Bill Rowan | Engineers supect a blown switch SCR. Delay for at least an hour if that is the case |
| Sep 30 2002 02:49:56:003PM | 1020930017 | Bill Rowan | The run is ended. There is a short in one of the caps in OH2L. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 07:23:24:350AM | Test | Ok | Data System Test: Some PS Camacs offline |
| 2 | 07:57:10:120AM | Test | Ok | Data System Test |
| 3 | 08:12:55:583AM | Test | Ok | Data System Test |
| 4 | 08:49:29:480AM | Test | Ok | Data System Test |
| 5 | 10:02:09:203AM | Plasma | Ok | |
| 6 | 10:19:09:337AM | Plasma | Ok | |
| 7 | 10:32:19:077AM | Plasma | Ok | |
| 8 | 10:53:46:220AM | Plasma | Ok | |
| 9 | 11:08:37:853AM | Plasma | Ok | |
| 10 | 11:28:16:460AM | Plasma | Ok | |
| 11 | 11:42:13:293AM | Plasma | Ok | |
| 12 | 11:56:18:223AM | Plasma | Ok | |
| 13 | 12:22:50:467PM | Plasma | Ok | |
| 14 | 12:39:38:100PM | Plasma | Ok | |
| 15 | 12:53:59:797PM | Plasma | Ok | |
| 16 | 01:14:16:873PM | Plasma | Ok | |
| 17 | 01:30:34:947PM | Plasma | Ok | |