| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Martin Greenwald |
| Physics operator(s): | Bill Rowan |
| Engineering operator(s): | Gary Dekow |
| Engineering Operator Run Comment |
| MP#304 H-mode regimes; SL: Greenwald; PO: Rowan; EO: Dekow |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:31:130PM |
| Author: To Be Determined |
| Run Summary for 1021008 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 1020930015, though we need to increase the upper triangularity. - 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: Not great luck today. Recovery from boronization was quicker than expected, but 4 hours were lost to a problem eventually traced to a power cable in the RF tuning system. Afterwards the RF was slow to come up to power - and a pair of high current disruptions and subsequent recovery took most of the rest of the afternoon. For the afternoon we switched to an Ip scan to maximize results (sacrificing pedestal profile studies). shot 17 was the only one that could contribute to the mp (though the RF power dropped to 1 MW at the L/H transition). It had average triangularity of 0.64 and q scanning from 5.3 to 4.6. A clear QC mode was seen on PCI, though the radiated power and density ramped continuously. ================================ |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:37:16:473PM |
| Author: To Be Determined |
| Physop Summary for Tuesday, October 8th, Run 1021008 Run Plan and Engineering Setup--------------------------------------------- Recovery from Boronization MP#304 H-mode regimes Session leader: Greenwald Physics Operator: Rowan For the experiment, use segment 2 of 1020930015 and segment 1 of 1021003024 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. Overnight boronization. ECDC in D2 after boronization until 7:00 am Run begins at 9:00 am and ends at 5:00 pm Set up for possible ECDC in D2 between shots. Power systems as on 1020930015 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------------------------------------------------------------------------- Boronization Recovery The plasma started up without difficulty. By shot 006, full length plasma shots were produced although we did continue to lose shots to boronization recovery throughout the day. Minor error field corrections and pressure corrections were made. Progress on the MP Shot 017 contains the triangularity, the q-scan, and the RF required for this MP. The other shots were used for shape setup, lacked RF, or failed to produce plasmas. One very long delay (after shot 006) was due to a failed controller for an RF tuning stub. A couple of shots were lost due to engineering problems. Logbook Entries------------------------------------------------------------------- Run Plan and Engineering setup for Tuesday, October 8th, Run 1021008 Recovery from Boronization MP#304 H-mode regimes Session leader: Greenwald Physics Operator: Rowan For the experiment, use segment 2 of 1020930015 and segment 1 of 1021003024 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. Overnight boronization. ECDC in D2 after boronization until 7:00 am Run begins at 9:00 am and ends at 5:00 pm Set up for possible ECDC in D2 between shots. Power systems as on 1020930015 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 ------------------------------------------------------------------------------- From Irby: Possible late start due to boronization delays Engineering Operator did the cold start. Loaded segment 1 from 1021003024 Loaded segment 2 from 1020930015 30 minutes of ecdc after completion of boronization. RF did some conditioning after ECDC shut down. Will do 10 minutes of ECDC before the first shot. Not requesting RF for the first few shots because this is boronization recovery Some additional delay before the first shot. Last minute shutter work. RF repair 002. Fizzle The prefill pressure was too high. Aroound 0.08mT For the next shot. Reduced the prefill from 27 ms to 23 ms. 003. Segment 2 was turned off on this shot. 005. Plasma. Next shot. Increase BZ by changing IC_EF4 from -1325 to -1315 Add 1 ms to the prefill. It is not 24 ms Reduced ZXU form 0.03 to 0.027 Long delay before next shot. Waiting for RF repairs. Problem with control of a stub tuner. 006. Plasma Next shot. RXU decreased by approximatly 0.025m ZXU decreased from 0.027 to 0.020 Current ramping from 0.8 MA to 1.2 MA during the RF 007. Plasma Next shot. RXL flattened RXU corrected to avoid the double null around 0.6s Ip ramp down started at 1.4s 008. Fizzle. Not sure what the pressure was. Ratiomatic was off. Next shot. Reloaded segment 2 form sho 007. Added 1 ms to the prefill 009. Fizzle EF3 breaker pulled before the shot. Next shot. RXU corrected to avoid the double null around 0.6s Ip ramp down started at 1.4s Modified RXL to flatted DeltaL 010. No shot. Engineering problems. 011. Plasma Next shot. No changes 012. Plasma disrupted at 1.5 s. On the current ramp down. Next shot. Reduced the current peak to 1.1MA 013. Fizzle Next shot. Reduced the TF to 5.3 T. 014. Plasma. Disrupted at 1.5 s on the rampddown Next shot. Made a small change in RXU so that the demand does not change so rapidly after 1.4 s 015. Fizzle Next shot. Reduced BZ_0; ic_ef4 reduced from -1315 to -1325 016. Dud Engineering problem. Blown fuse on OH2L 017. Plasma. No disruption H-mode from 0.8 s to 1.1 s Next shot. Put the current peak back at 1.2 MA 018. Fizzle |
| Session Leader Comments | |||
| Oct 8 2002 09:38:51:820AM | Martin Greenwald | Background: Previous experiments have explored the EDA/ELMfree boundary and found strong dependence on q and $\delta$. Other studies have found a boundary between EDA and type II ELMs at high $\beta$ (or $\alpha$) and high temperature. In particular we will exploit the increased shaping and increased RF power available during this campaign. 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. | |
| Oct 8 2002 05:24:05:007PM | Martin Greenwald | Results: Not great luck today. Recovery from boronization was quicker than expected, but 4 hours were lost to a problem eventually traced to a power cable in the RF tuning system. Afterwards the RF was slow to come up to power - and a pair of high current disruptions and subsequent recovery took most of the rest of the afternoon. For the afternoon we switched to an Ip scan to maximize results (sacrificing pedestal profile studies). shot 17 was the only one that could contribute to the mp (though the RF power dropped to 1 MW at the L/H transition). It had average triangularity of 0.64 and q scanning from 5.3 to 4.6. A clear QC mode was seen on PCI, though the radiated power and density ramped continuously. | |
| Oct 8 2002 09:42:02:930AM | 1021008003 | Martin Greenwald | Plasma - ohmic |
| Oct 8 2002 09:51:26:333AM | 1021008004 | Martin Greenwald | plasma - ohmic |
| Oct 8 2002 10:08:53:290AM | 1021008005 | Martin Greenwald | Plasma - under control this time still no RF power |
| Oct 8 2002 01:57:34:467PM | 1021008006 | Martin Greenwald | Plasma - ohmic after long delay still no RF, but engineering problem is fixed |
| Oct 8 2002 02:49:26:697PM | 1021008007 | Martin Greenwald | Plasma - ohmic higher triangularity scanning current now 0.8 - 1.2 during "RF time" still no RF |
| Oct 8 2002 02:48:39:103PM | 1021008008 | Martin Greenwald | fizzle |
| Oct 8 2002 02:48:13:243PM | 1021008009 | Martin Greenwald | dud |
| Oct 8 2002 02:56:39:477PM | 1021008010 | Martin Greenwald | No power cycle |
| Oct 8 2002 03:17:28:887PM | 1021008011 | Martin Greenwald | Plasma - late H-mode RF power ramps to 1.8 MW H-mode is mostly during ohmic phase following RF |
| Oct 8 2002 03:33:57:853PM | 1021008012 | Martin Greenwald | Plasma - L-mode RF only at 1 MW |
| Oct 8 2002 03:53:59:667PM | 1021008013 | Martin Greenwald | fizzle |
| Oct 8 2002 03:58:25:667PM | 1021008014 | Martin Greenwald | Plasma - L-mode disrupts early in rampdown only 1 MW RF |
| Oct 8 2002 04:07:31:993PM | 1021008015 | Martin Greenwald | fizzle |
| Oct 8 2002 04:24:12:887PM | 1021008016 | Martin Greenwald | dud |
| Oct 8 2002 05:01:10:840PM | 1021008017 | Martin Greenwald | Plasma - H-mode QC mode seen on PCI RF power briefly at 2 MW then drops back to 1 MW delta_av = 0.642 delta_u = 0.6 delta_l = 0.68 q95 = 4.7 |
| Physics Operator Comments | |||
| Oct 8 2002 08:10:17:297AM | Bill Rowan | Run Plan and Engineering setup for Tuesday, October 8th, Run 1021008 Recovery from Boronization MP#304 H-mode regimes Session leader: Greenwald Physics Operator: Rowan For the experiment, use segment 2 of 1020930015 and segment 1 of 1021003024 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. Overnight boronization. ECDC in D2 after boronization until 7:00 am Run begins at 9:00 am and ends at 5:00 pm Set up for possible ECDC in D2 between shots. Power systems as on 1020930015 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 ------------------------------------------------------------------------------- | |
| Oct 8 2002 08:12:22:550AM | Bill Rowan | From Irby: Possible late start due to boronization delays. | |
| Oct 8 2002 08:36:41:857AM | Bill Rowan | Engineering Operator did the cold start. Loaded segment 1 from 1021003024 Loaded segment 2 from 1020930015 | |
| Oct 8 2002 09:03:18:747AM | Bill Rowan | 30 minutes of ecdc after completion of boronization. RF did some conditioning after ECDC shut down. Will do 10 minutes of ECDC before the first shot. Not requesting RF for the first few shots because this is boronization recovery | |
| Oct 8 2002 09:20:23:733AM | Bill Rowan | Some additional delay before the first shot. Last minute shutter work. RF repair | |
| Oct 8 2002 09:39:29:617AM | 1021008002 | Bill Rowan | 002. Fizzle The prefill pressure was too high. Aroound 0.08mT For the next shot. Reduced the prefill from 27 ms to 23 ms. |
| Oct 8 2002 09:38:57:023AM | 1021008003 | Bill Rowan | 003. Segment 2 was turned off on this shot. Next shot. Turn on segment 2 and try again. |
| Oct 8 2002 10:05:28:427AM | 1021008005 | Bill Rowan | 005. Plasma. |
| Oct 8 2002 10:12:05:450AM | 1021008005 | Bill Rowan | Next shot. Increase BZ by changing IC_EF4 from -1325 to -1315 Add 1 ms to the prefill. It is not 24 ms |
| Oct 8 2002 10:21:02:727AM | 1021008005 | Bill Rowan | For the next shot: Reduced ZXU form 0.03 to 0.027 |
| Oct 8 2002 10:40:22:530AM | 1021008005 | Bill Rowan | Long delay between shots. Waiting for RF repairs. |
| Oct 8 2002 01:39:12:650PM | 1021008005 | Bill Rowan | Problem with control of a stub tuner. Now repaired. Continuing with the run |
| Oct 8 2002 02:00:17:410PM | 1021008006 | Bill Rowan | Next shot. RXU decreased by approximatly 0.025m ZXU decreased from 0.027 to 0.020 Current ramping from 0.8 MA to 1.2 MA during the RF |
| Oct 8 2002 02:19:35:417PM | 1021008007 | Bill Rowan | 007. Plasma Next shot. RXL flattened RXU corrected to avoid the double null around 0.6s Ip ramp down started at 1.4s |
| Oct 8 2002 02:35:06:880PM | 1021008008 | Bill Rowan | 008. Fizzle. Not sure what the pressure was. Ratiomatic was off. Next shot. Reloaded segment 2 form sho 007. Added 1 ms to the prefill |
| Oct 8 2002 02:50:23:227PM | 1021008009 | Bill Rowan | 009. Fizzle EF3 breaker pulled before the shot. Next shot. RXU corrected to avoid the double null around 0.6s Ip ramp down started at 1.4s Modified RXL to flatted DeltaL |
| Oct 8 2002 02:54:37:417PM | 1021008010 | Bill Rowan | 010. No shot. Engineering problems. |
| Oct 8 2002 03:22:49:120PM | 1021008011 | Bill Rowan | 011. Plasma Next shot. No changes |
| Oct 8 2002 03:33:02:590PM | 1021008012 | Bill Rowan | 012. Plasma disrupted at 1.5 s. On the current ramp down. Next shot. Reduced the current peak to 1.1MA |
| Oct 8 2002 03:51:29:040PM | 1021008013 | Bill Rowan | 013. Fizzle Next shot. Reduced the TF to 5.3 T. |
| Oct 8 2002 04:03:12:743PM | 1021008014 | Bill Rowan | 014. Plasma. Disrupted at 1.5 s on the rampddown Next shot. Made a small change in RXU so that the demand does not change so rapidly after 1.4 s |
| Oct 8 2002 04:16:49:120PM | 1021008015 | Bill Rowan | 015. Fizzle Next shot. Reduced BZ_0; ic_ef4 reduced from -1315 to -1325 |
| Oct 8 2002 04:23:30:650PM | 1021008016 | Bill Rowan | 016. Dud Engineering problem. |
| Oct 8 2002 04:31:47:320PM | 1021008016 | Bill Rowan | Engineering problem. Blown fuse on OH2L |
| Oct 8 2002 05:01:03:887PM | 1021008017 | Bill Rowan | 017. Plasma. No disruption H-mode from 0.8 s to 1.1 s Next shot. Put the current peak back at 1.2 MA |
| Oct 8 2002 05:14:34:740PM | 1021008018 | Bill Rowan | 018, Fizzle |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:28:54:083AM | Test | Ok | Cycle Test |
| 2 | 09:21:48:237AM | Plasma | Ok | |
| 3 | 09:34:50:893AM | Plasma | Ok | |
| 4 | 09:48:00:360AM | Plasma | Ok | |
| 5 | 10:01:41:813AM | Plasma | Ok | |
| 6 | 01:42:52:130PM | Plasma | Ok | |
| 7 | 02:02:06:323PM | Plasma | Ok | |
| 8 | 02:21:15:013PM | Plasma | Ok | |
| 9 | 02:36:48:010PM | Plasma | Bad | EF3 15KV Circuit Breaker Opened Just prior to the shot |
| 10 | 02:52:02:040PM | Plasma | Bad | No Power Shot Igor Failure from previous cycle |
| 11 | 03:09:47:353PM | Plasma | Ok | |
| 12 | 03:24:16:883PM | Plasma | Ok | |
| 13 | 03:38:41:273PM | Plasma | Ok | |
| 14 | 03:52:25:620PM | Plasma | Ok | |
| 15 | 04:05:20:853PM | Plasma | Ok | |
| 16 | 04:19:36:993PM | Plasma | Bad | PF breaker pulled during pulse OH2L fault |
| 17 | 04:51:34:230PM | Plasma | Ok | |
| 18 | 05:05:23:127PM | Plasma | Ok | |