| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Robert Granetz |
| Physics operator(s): | Bill Rowan |
| Engineering operator(s): | Gary Dekow |
| Engineering Operator Run Comment |
| MP# 371: 2MA operation at 8T |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:04:227PM |
| Author: Robert Granetz |
| Run summary for run 1040401 (Thursday): MP 371 -- 2 MA operation at 8 T Session leader: R. Granetz/J. Irby Physics operator: W. Rowan Summary: No progress made. We only got a half-day because the NSTAR 13.8 kV line went down in the middle of the day (no doubt due to the heavy rains and flooding we're experiencing), and all the 8 T attempts during the morning were fizzles. This might be an effect of last night's boronization. ------------------------------------------------------------------------------- Run Plan: Start with a repeat of 1040331001 (1.05 MA, 5.5 T, Prf=4 MW) to confirm that TF instrumentation is all working, and to determine if boronization recovery is necessary. When ready, load shot 1040331006 (1.05 MA, 8.0 T) from yesterday. (Set PLC TF limit at 235 kA and TF start at t=-1.5 s). Raise Ip in 0.2 MA increments, while also raising the A-coil current and the PLC OH/EF limits appropriately. (Session leaders will specify the desired A-coil current for each shot.) We want RF heating in order to help with OH flux budget, but if it introduces lots of impurities, we may want to rethink this. Monitor: (1) locked mode diagnostics (2) halo currents and Ih*Bt product on disruptions (3) TF, OH, and EF instrumentation If locked modes appear, we have the option of raising the plasma density, in addition to the A-coil current, depending on how successful the RF is at heating the plasma. If it is feasible to shorten the flattop, we should do it in order to reduce magnet heating and increase the rep rate. ------------------------------------------------------------------------------- Boronization was done overnight. No ECDC, no bake. ------------------------------------------------------------------------------- |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:49:757PM |
| Author: Bill Rowan |
| Physop Summary for 1040401. April 1, 2004. Purpose: MP 371: 2 MA operation at 8 T Session leader: R. Granetz/J. Irby Physics operator: W. Rowan Summary The machine was boronized last night. The first plasma attempt was a fizzle. The following shot disrupted early possibly due to an injection. The following four shots were at 5.4 T and all were full length. After going to 8 T for shot 008, there were 4 fizzles. In the course of these, parameters were first changed to closely match prefill, BR_0, and Bz_0 on shot 006 from earlier in the day. This did not work. Changes to prefill pressure in the opposite direction and to BR_0 also produced a fizzle. The next change would have been to reload shot 1040401007 to return to the shot used earlier in the day. No shots were taken since the 13.8 kV input to the lab failed just as the shot was starting. Score Card Engineer test 1 001 Fizzles 5 002,008,009,010,011 Early disruption 1 003 Plasma 4 004,005,006,007 Engineering Fault 1 012 Details Engineering setup for Thursday, 01 Apr 2004 MP 371: 2 MA operation at 8 T Session leader: R. Granetz/J. Irby Physics operator: W. Rowan No ECDC overnight, since we're boronizing. Run begins at 09:00 and ends at 17:00. Power systems the same as 1040331001 (1.05 MA, 5.5 T, lower X-point) A-coils should be configured as on 1040127010 (+Dtop -Dbot -Jtop +Jbot) 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 with 15 psi He3 Hybrid enabled (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: ECE (set for 8 tesla), TCI, halo current diagnostics, TF scanner and OH coax resistance and thermocouple instrumentation ------------------------------------------------------------------------------- RF Setup: All four transmitters in RUN-ON by 08:00, all at 80 MHz ------------------------------------------------------------------------------- Run Plan: Start with a repeat of 1040331001 (1.05 MA, 5.5 T, Prf=4 MW) to confirm that TF instrumentation is all working, and to determine if boronization recovery is necessary. When ready, load shot 1040331006 (1.05 MA, 8.0 T) from yesterday. (Set PLC TF limit at 235 kA and TF start at t=-1.5 s). Raise Ip in 0.2 MA increments, while also raising the A-coil current and the PLC OH/EF limits appropriately. (Session leaders will specify the desired A-coil current for each shot.) We want RF heating in order to help with OH flux budget, but if it introduces lots of impurities, we may want to rethink this. Monitor: (1) locked mode diagnostics (2) halo currents and Ih*Bt product on disruptions (3) TF, OH, and EF instrumentation If locked modes appear, we have the option of raising the plasma density, in addition to the A-coil current, depending on how successful the RF is at heating the plasma. If it is feasible to shorten the flattop, we should do it in order to reduce magnet heating and increase the rep rate. Boronization last night. Load the first shot from yesterday to check the operation before starting the high-current, high-field discharges Loaded 1040331001. Reduced the prefill from 15 ms to 13 ms expecting more fueling in the early discharges after boronization 001. TF test shot at low current. Next shot. Disabled PG2 (b-side upper). This is He3. I am told that JT reported that it built up shot to shot yesterday and we would prefer to have control over the level. Delay in the next shot due to computer problems. 002. Fizzle Next shot. Increased the prefill by 2 ms back to 15 ms Both BR_0 and Bz_0 are the same as on shot 1040331001. The shot loaded had a field of 6.5T. I reduced this to 5.4 T for the next shot. 003. Plasma. Early disruption. Finally ends at 180 ms. Next shot. Reduced IP to 0.8 MA 004. Plasma. Full length. Next shot. Increased current demand near 0.1 s to get rid of glitch. 005. Plasma. Next shot. Increased the current to 1 MA. 006. Plasma. Full length. 1.0 MA DNB gate valve did not open properly on this shot or on a couple previous. Due to some problem in moving through states. Minor as the machine is operating perfectly well. Josh and Tom are working on it. Next shot. No PCS changes. 007. Plasma. Full length. Next shot. Reloaded shot 1040331006. Changed PLC TF limit to 235 kA Changed TF start time 10 -1.5 s Enabled PG2 (b-side upper) Increased PG2 from 6 ms (which is the value for the shot that I loaded) to 15 ms at request of RF-folk This shot is expected to be 8T and 1MA 008. Fizzle BT reached 8T Next shot. Bz_0 is more negative on shot 008 than on 007. Changed IC_EF4 fro, -1335 to -1325 to make Bz_0 more positive 009. Fizzle. For this shot. The prefill is 15 ms. Pressure is 0.037 mT For shot 006, the pressure was 0.043 mT Next shot. Prefill increased from 15 ms to 16 ms 010 Fizzle Next shot. Prefill decreased from 16 ms to 14 ms. That is a reduction of 1 ms from shot 008. Changed IC_EF4 -1335 Changed BR_0 to from 0 to 0.2 mT 011. Fizzle prefill pressure is 0.031 Next shot. Reload the last 5.4 T shot that worked today. Reload 1040401007 012. Problem before this shot. Breakers out. Lost the 13.8 kV input to the lab. |
| Session Leader Comments | |||
| Mar 31 2004 07:10:03:323PM | Robert Granetz | Run Plan: Start with a repeat of 1040331001 (1.05 MA, 5.5 T, Prf=4 MW) to confirm that TF instrumentation is all working, and to determine if boronization recovery is necessary. When ready, load shot 1040331006 (1.05 MA, 8.0 T) from yesterday. (Set PLC TF limit at 235 kA and TF start at t=-1.5 s). Raise Ip in 0.2 MA increments, while also raising the A-coil current and the PLC OH/EF limits appropriately. (Session leaders will specify the desired A-coil current for each shot.) We want RF heating in order to help with OH flux budget, but if it introduces lots of impurities, we may want to rethink this. Monitor: (1) locked mode diagnostics (2) halo currents and Ih*Bt product on disruptions (3) TF, OH, and EF instrumentation If locked modes appear, we have the option of raising the plasma density, in addition to the A-coil current, depending on how successful the RF is at heating the plasma. If it is feasible to shorten the flattop, we should do it in order to reduce magnet heating and increase the rep rate. | |
| Apr 1 2004 08:04:44:507AM | Robert Granetz | Boronization was done overnight. No ECDC, no bake. | |
| Apr 1 2004 04:21:30:787PM | Robert Granetz | Run summary for run 1040401 (Thursday): MP 371 -- 2 MA operation at 8 T Session leader: R. Granetz/J. Irby Physics operator: W. Rowan Summary: No progress made. We only got a half-day because the NSTAR 13.8 kV line went down in the middle of the day (no doubt due to the heavy rains and flooding we're experiencing), and all the 8 T attempts during the morning were fizzles. This might be an effect of last night's boronization. | |
| Physics Operator Comments | |||
| Apr 1 2004 08:08:52:030AM | Bill Rowan | Engineering setup for Thursday, 01 Apr 2004 MP 371: 2 MA operation at 8 T Session leader: R. Granetz/J. Irby Physics operator: W. Rowan No ECDC overnight, since we're boronizing. Run begins at 09:00 and ends at 17:00. Power systems the same as 1040331001 (1.05 MA, 5.5 T, lower X-point) A-coils should be configured as on 1040127010 (+Dtop -Dbot -Jtop +Jbot) 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 with 15 psi He3 Hybrid enabled (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: ECE (set for 8 tesla), TCI, halo current diagnostics, TF scanner and OH coax resistance and thermocouple instrumentation ------------------------------------------------------------------------------- RF Setup: All four transmitters in RUN-ON by 08:00, all at 80 MHz ------------------------------------------------------------------------------- Run Plan: Start with a repeat of 1040331001 (1.05 MA, 5.5 T, Prf=4 MW) to confirm that TF instrumentation is all working, and to determine if boronization recovery is necessary. When ready, load shot 1040331006 (1.05 MA, 8.0 T) from yesterday. (Set PLC TF limit at 235 kA and TF start at t=-1.5 s). Raise Ip in 0.2 MA increments, while also raising the A-coil current and the PLC OH/EF limits appropriately. (Session leaders will specify the desired A-coil current for each shot.) We want RF heating in order to help with OH flux budget, but if it introduces lots of impurities, we may want to rethink this. Monitor: (1) locked mode diagnostics (2) halo currents and Ih*Bt product on disruptions (3) TF, OH, and EF instrumentation If locked modes appear, we have the option of raising the plasma density, in addition to the A-coil current, depending on how successful the RF is at heating the plasma. If it is feasible to shorten the flattop, we should do it in order to reduce magnet heating and increase the rep rate. Boronization last night. | |
| Apr 1 2004 08:17:37:603AM | Bill Rowan | Boronization last night. Load the first shot from yesterday to check the operation before starting the high-current, high-field discharges Loaded 1040331001. Reduced the prefill from 15 ms to 13 ms expecting more fueling in the early discharges after boronization | |
| Apr 1 2004 09:01:50:563AM | 1040401001 | Bill Rowan | 001. TF test shot at low current. |
| Apr 1 2004 09:11:18:530AM | 1040401001 | Bill Rowan | 001. TF test shot at low current.Next shot. Disabled PG2 (b-side upper). This is He3. I am told that JT reported that it built up shot to shot yesterday and we would prefer to have control over the level. |
| Apr 1 2004 09:11:54:580AM | 1040401001 | Bill Rowan | Delay in the next shot due to computer problems. |
| Apr 1 2004 09:25:29:710AM | 1040401002 | Bill Rowan | Both BR_0 and Bz_0 are the same as on shot 1040331001. The shot loaded had a field of 6.5T. I reduced this to 5.4 T for the next shot. |
| Apr 1 2004 09:49:51:607AM | 1040401003 | Bill Rowan | 003. Plasma. Early disruption. Finally ends at 180 ms. Next shot. Reduced IP to 0.8 MA |
| Apr 1 2004 10:05:47:880AM | 1040401004 | Bill Rowan | 004. Plasma. Full length. Next shot. Increased current demand near 0.1 s to get rid of glitch. |
| Apr 1 2004 10:25:22:630AM | 1040401005 | Bill Rowan | 005. Plasma. Next shot. Increased the current to 1 MA. |
| Apr 1 2004 10:37:47:430AM | 1040401006 | Bill Rowan | 006. Plasma. Full length. 1.0 MA DNB gate valve did not open properly on this shot or on a couple previous. Due to some problem in moving through states. Minor as the machine is operating perfectly well. Josh and Tom are working on it. Next shot. No PCS changes. |
| Apr 1 2004 11:05:00:973AM | 1040401007 | Bill Rowan | 007. Plasma. Full length. Next shot. Reloaded shot 1040331006. Changed PLC TF limit to 235 kA Changed TF start time 10 -1.5 s Enabled PG2 (b-side upper) Increased PG2 from 6 ms (which is the value for the shot that I loaded) to 15 ms at request of RF-folk |
| Apr 1 2004 11:06:12:053AM | 1040401007 | Bill Rowan | This shot is expected to be 8T and 1MA |
| Apr 1 2004 11:21:10:387AM | 1040401008 | Bill Rowan | 008. Fizzle BT reached 8T Next shot. Bz_0 is more negative on shot 008 than on 007. Changed IC_EF4 fro, -1335 to -1325 to make Bz_0 more positive |
| Apr 1 2004 11:49:07:133AM | 1040401009 | Bill Rowan | 009. Fizzle. For this shot. The prefill is 15 ms. Pressure is 0.037 mT For shot 006, the pressure was 0.043 mT Next shot. Prefill increased from 15 ms to 16 ms |
| Apr 1 2004 12:07:12:193PM | 1040401010 | Bill Rowan | 010 Fizzle Next shot. Prefill decreased from 16 ms to 14 ms. That is a reduction of 1 ms from shot 008. Changed IC_EF4 -1335 Changed BR_0 to from 0 to 0.2 mT |
| Apr 1 2004 01:04:45:267PM | 1040401012 | Bill Rowan | 011. Fizzle prefill pressure is 0.031 Next shot. Reload the last 5.4 T shot that worked today. Reload 1040401007 012. Problem before this shot. Breakers out. Lost the 13.8 kV input to the lab. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 08:59:56:700AM | Test | Ok | TF 50kA plc test shot |
| 2 | 09:15:10:697AM | Plasma | Ok | |
| 3 | 09:38:03:480AM | Plasma | Ok | |
| 4 | 09:55:48:913AM | Plasma | Ok | |
| 5 | 10:13:19:067AM | Plasma | Ok | |
| 6 | 10:30:21:420AM | Plasma | Ok | |
| 7 | 10:52:23:250AM | Plasma | Ok | |
| 8 | 11:08:47:103AM | Plasma | Ok | |
| 9 | 11:33:08:813AM | Plasma | Ok | |
| 10 | 11:56:10:910AM | Plasma | Ok | |
| 11 | 12:19:41:120PM | Plasma | Ok | |
| 12 | 12:43:05:310PM | Test | Ok | |
| 13 | 04:12:16:650PM | Test | Ok | |
| 14 | 04:18:26:137PM | Test | Ok | |
| 15 | 04:27:52:837PM | Test | Ok | |