| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Bill Rowan,Steve Scott |
| Physics operator(s): | Bill Rowan |
| Engineering operator(s): | Bill Cochran,Bill Parkin |
| Engineering Operator Run Comment |
| MP 265 CXRS Commissioning. MP 431 Faraday Rotation in MSE Optics. |
| Session Leader Plans |
| Physics Operators Plans |
| Entered: Nov 7 2005 05:15:29:730PM |
| Author: Bill Rowan |
| Engineering Setup and Run Plan for Tuesday 8-Nov-2005
MP 265 CXRS Commissioning. Session Leader: Rowan MP 431 Faraday Rotation in MSE Optics. Session Leader: Ko/Scott Physics operator: Rowan Overnight ECDC in D2, and bake at 60 C. Run begins at 09:00 and ends at 17:00 Power systems as on 1051104028 (1.0 MA fiducial, 5.4 T, lower single null) A-coil configuration: normal [+Dtop -Dbot -Jtop +Jbot] and enabled. Gas Setup: fill B-Top with 6 psi D2 Hybrid enabled (PG4) fill B-side lower with 1 psi Ar Hybrid DISABLED (PG1) leave B-side upper as is Hybrid DISABLED (PG2) fill B-main (C-side) with 40 psi D2 Hybrid enabled (PG3) leave NINJA as is DISABLED Enable the following gate valves and shutters: ECE, VUV, Z-bolo shutters Torvac setup: Gate valves open DNB WILL BE REQUIRED FOR THIS RUN Start with MP 265. Vary density over the nl_04 range 0.5 to 1.0E+20. Vary the DNB voltage from 40 kV to 50 kV. The goal is to verify the photon emission cross sections that are used for inference of B+5 density from CXRS emission. This will be completed in less than 10 shots. Continue with MP 431. BT ramps based on the setup for shot 1050718004 IP ramps based on the setup for shot 1050629023 |
| Session Leader Summaries |
| Entered: Nov 8 2005 06:26:23:910PM |
| Author: Bill Rowan |
| For MP 265, the cxrs photon emission cross section dependence on beam energy
was measured. The initial, rough analysis of the beam energy scan is that the cross section for charge exchange recombination between the beam neutrals and BVI is not simply described by an interaction of fully stripped boron with full energy hydrogen neutrals in the n=1 state. At least at the high energy end of the scan, other energy components contribute. From the lower energy part of the scan it is appears that hydrogen beam neutrals in states with n>1 contribute to the emission. Of course, this interpretation may change somewhat when a quantitative analysis replaces this qualitative one. During this experiment, the beam ran well over the energy range from 30 kV to 50 kV. After the neutralizer but before entering the duct, the main energy component density is approximately 19%. The water component seems high at approximately 36% but the beam runs well (that is, without faults) in spite of that. |
| Entered: Nov 17 2005 10:01:06:603AM |
| Author: Steve Scott |
| We successfully completed MP431 to measure the Faraday rotation (or lack of it) in the MSE optics. The procedure is simple: position a linear polarizer immediately in front of MSE's plasma-facing lens, and illuminate it with light from an Ohmic plasma. The light incident on MSE therefore has a fixed polarization direction. So any changes in the measured polarization direction are presumably due to Faraday rotation. In this miniproposal, we created plasmas with a Bt ramp at constant Ip, an Ip ramp at constant Bt, and also reference plasmas with a long flattop on both Bt and Ip. Shots 20 and 24 have a BT ramp at constant Ip, to look for Faraday rotation in lens L1 due to the toroidal field. Shots 27 and 29 have an Ip ramp at constant Bt, to look for Faraday rotation in the other optical elements due to the vertical and/or radial field. Shots 18 and 19 are reference shots with a long Ip and Bt flattop. The initial results seem to indicate that there is very little, if any, Faraday rotation in the MSE optical sytem. |
| Physics Operator Summaries |
| Entered: Nov 8 2005 06:07:14:220PM |
| Author: Bill Rowan |
| The goals of both miniproposals were accomplished. For MP 265, the cxrs photon
emission cross section dependence on beam energy was measured. During this experiment, the beam ran well over the energy range of 30 kV to 50 kV. After the neutralizer and before entering the duct, the water component density is approximately 36% and the main energy component density is approximately 19%. The water component seems high but the beam runs well in spite of that. For MP 431, the Faraday rotation in the MSE optics was measured. For both, see the SL summaries. The last few shots were used to look at the sensitivity of Alex Ince-Cushman's poloidal rotation diagnostic. There were problems with duds and fizzles although fields (BR and BZ) looked okay. By the end of the run, the prefill pulse had been increased to 40 ms to get full length discharges. The prefill was increased first in response to duds and then in responsed to fizzles with bounces. Score card Plasmas: 19 (001,003,004,006,011,012,013,014,015,016,018,019,020,024,025,027, 029,031,032) Fizzles: 6 (017,021,022,023,028,030) Duds: 6 (002,005,007,008,009,010) No power: 1 (026, action monitor fault) --------- Total: 32 |
| Session Leader Comments | |||
| Nov 8 2005 03:20:47:220PM | Steve Scott | good Bt ramp shot (condition #2 in the miniproposal). We will take one repeat. Note that this shot doesn't have quite the same Bt waveform as shot 20. | |
| Nov 8 2005 12:39:23:100PM | 1051108015 | Steve Scott | We will be starting with condition "1" of table 1 of MP431 (page 8). This will be a 5.4 Tesla, 0.5 MA shot with a long Ip and BT flattop. |
| Nov 8 2005 12:51:58:380PM | 1051108016 | Steve Scott | Try again for condition "1": flattop Bt + Ip 5.4 T, 0.5 MA |
| Nov 8 2005 01:22:28:990PM | 1051108017 | Steve Scott | Trying again for condition "1", but got a fizzle. |
| Nov 8 2005 02:10:10:003PM | 1051108019 | Steve Scott | repeat condition #1 after a cell access to adjust position of the MSE wire grid polarizer. nominally this should be a repeat of shot 18. This shot had lots of runaways. |
| Nov 8 2005 02:42:40:973PM | 1051108021 | Steve Scott | Attempt repeat of the condition #2 = Bt ramp at fixed Ip. got a fizzle. |
| Nov 8 2005 04:32:48:940PM | 1051108022 | Steve Scott | Fizzle. |
| Nov 8 2005 04:33:46:067PM | 1051108024 | Steve Scott | Good Bt ramp shot |
| Nov 8 2005 03:30:57:877PM | 1051108025 | Steve Scott | Tried for a third shot with the Bt ramp, but got another fizzle. So we'll declare victory here, and for the next shot we'll try an Ip ramp at fixed Bt. |
| Nov 8 2005 04:44:07:660PM | 1051108029 | Steve Scott | good shot with Ip ramp. this is the nominal end of the MP431 ... now take a few shots for neon puffing studies. |
| Nov 8 2005 04:56:03:503PM | 1051108031 | Steve Scott | good 1MA shot. |
| Physics Operator Comments | |||
| Nov 8 2005 08:32:02:837AM | Bill Rowan | Before the run, a heater cable was found to be damaged. The connector was burned. We will procede without that heater.
loaded 1051104028 | |
| Nov 8 2005 09:16:23:117AM | 1051108001 | Bill Rowan | 001. Plasma. full length. nel_04=1.0. beam at 0.5 s
Next shot. Move the beam to 1.0s No pcs changes |
| Nov 8 2005 09:39:49:930AM | 1051108002 | Bill Rowan | 002. Dud
Next shot. Add 1 ms to prefill puff. now 26 ms |
| Nov 8 2005 09:51:52:117AM | 1051108003 | Bill Rowan |
003. Plasma. Next shot. Attempt to reduce density to nl_04=8e+19 |
| Nov 8 2005 10:08:57:337AM | 1051108004 | Bill Rowan | 004. Plasma. nl_04 = 0.77e+20
Next shot. Attempt to reduce the density again to nl_04=0.6e+20 |
| Nov 8 2005 10:20:52:490AM | 1051108005 | Bill Rowan | 005. Dud.
Next shot. Add 1 ms to prefill puff. Now 27 ms |
| Nov 8 2005 10:39:48:163AM | 1051108006 | Bill Rowan | 006. Plasma. nel04=0.57e+20
Next shot. nl_04=0.8e+20 |
| Nov 8 2005 10:57:33:040AM | 1051108007 | Bill Rowan | 007. Dud
Next shot. EF4 more positive. change from -1340 to -1335 |
| Nov 8 2005 11:09:35:303AM | 1051108008 | Bill Rowan | 008. Dud
Next shot. Add 1 ms to prefill puff. Now 28 ms |
| Nov 8 2005 11:24:43:460AM | 1051108009 | Bill Rowan | 009. Dud
Next shot. EF4 more negative. change from -1335 to -1340 (starting value for the day) Add 1 ms to prefill puff. Now 29 ms. |
| Nov 8 2005 11:39:01:180AM | 1051108010 | Bill Rowan | 010. dud
Next shot. Increase prefill puff to 32 ms |
| Nov 8 2005 11:57:37:740AM | 1051108011 | Bill Rowan | 011. Plasma
Next shot. Increase prefill puff to 34 ms Enabled B-side lower. PG1. On at 0.3 s for 40 ms |
| Nov 8 2005 12:04:39:397PM | 1051108012 | Bill Rowan | 012. Plasma
Next shot. Increase prefill puff to 35 ms |
| Nov 8 2005 12:32:12:337PM | 1051108013 | Bill Rowan | 013. Plasma
Next shot. No pcs changes |
| Nov 8 2005 12:44:06:290PM | 1051108014 | Bill Rowan | 014. Plasma
Last shot for this experiment. Next shot. start mp 431 Steve Scott is SL reloaded segment 2 from 1050718004 recalculated the magnetics predictors as required load/clean |
| Nov 8 2005 01:13:32:587PM | 1051108015 | Bill Rowan | 015. Plasma
Next shot. BT=5.4T IP=500 kA |
| Nov 8 2005 01:13:11:773PM | 1051108016 | Bill Rowan | 016. IP reduced to 500 kA
BT flattened at 5.4 T Disruption at 0.5 s. Next shot. Reduce the density demand to 0.5e+20 Disable B-side lower |
| Nov 8 2005 01:18:19:397PM | 1051108017 | Bill Rowan | 017. Fizzle.
Post disruption fizzle. Next shot. Reduce the prefill by 1 ms to 34 ms |
| Nov 8 2005 01:38:30:170PM | 1051108018 | Bill Rowan | 018. Plasma
Cell access after this shot for MSE Next shot. No PCS changes |
| Nov 8 2005 02:19:52:847PM | 1051108019 | Bill Rowan | 019. Plasma
Next shot. Increase prefill by 1 ms to 35 ms BT to 6.5 T at the beginning of segment 2. Then ramp to 3 T by 1.5 s |
| Nov 8 2005 02:28:30:300PM | 1051108020 | Bill Rowan | 020. Plasma
Next shot. Trim the BT ramping. Obtain 6.5 T early the shot and then ramp to 2.5 T by 1.5 s |
| Nov 8 2005 02:30:27:957PM | 1051108020 | Bill Rowan | Increase prefill by 1 ms to 36 ms
|
| Nov 8 2005 02:37:13:190PM | 1051108021 | Bill Rowan | 021. Fizzle
Next shot. Reduce the prefill by 1 ms to 35 ms |
| Nov 8 2005 02:51:52:800PM | 1051108022 | Bill Rowan | 022. Fizzle
Next shot. Increase the prefill by 3 ms to 38 ms. |
| Nov 8 2005 03:11:36:923PM | 1051108023 | Bill Rowan | 023. Fizzle
Next shot. Increase the prefill by 2 ms to 40 ms |
| Nov 8 2005 03:17:17:893PM | 1051108024 | Bill Rowan | 024. Plasma
Next shot: No pcs changes |
| Nov 8 2005 03:37:56:127PM | 1051108025 | Bill Rowan | 025. Plasma
Next shot. Bt constant at 5.4 T IP ramp from 1 MA down to 0.3 MA at 1.5 s Reload 1051108014 and put in the IP ramp |
| Nov 8 2005 03:51:48:393PM | 1051108026 | Bill Rowan | 026. No power shot. Action monitor did not start
Next shot. No pcs changes |
| Nov 8 2005 03:58:46:237PM | 1051108027 | Bill Rowan | 027, Plasma
Next shot. No PCS changes. |
| Nov 8 2005 04:13:49:207PM | 1051108028 | Bill Rowan | 028. Fizzle
Next shot. No PCS changes |
| Nov 8 2005 06:04:25:940PM | 1051108029 | Bill Rowan | 029. Plasma.
End of the MSE run. |
| Nov 8 2005 04:39:58:347PM | 1051108030 | Bill Rowan | 030. Fizzle
Next shot. EF4: -1340 to -1330 |
| Nov 8 2005 04:53:03:033PM | 1051108031 | Bill Rowan | 031. Plasma
Next shot. Increase PG1 to 120 ms |
| Nov 8 2005 05:50:27:393PM | 1051108032 | Bill Rowan | 032. Plasma
End of the run |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 09:04:23:757AM | Plasma | Ok | |
| 2 | 09:26:46:257AM | Plasma | Ok | |
| 3 | 09:41:26:790AM | Plasma | Ok | |
| 4 | 09:58:27:930AM | Plasma | Ok | |
| 5 | 10:14:10:837AM | Plasma | Ok | |
| 6 | 10:27:49:710AM | Plasma | Ok | |
| 7 | 10:52:18:257AM | Plasma | Ok | |
| 8 | 11:05:56:320AM | Plasma | Ok | |
| 9 | 11:19:02:617AM | Plasma | Ok | |
| 10 | 11:33:00:490AM | Plasma | Ok | |
| 11 | 11:46:05:663AM | Plasma | Ok | |
| 12 | 11:59:26:837AM | Plasma | Ok | |
| 13 | 12:14:13:193PM | Plasma | Ok | |
| 14 | 12:29:35:663PM | Plasma | Ok | |
| 15 | 12:45:29:087PM | Plasma | Ok | |
| 16 | 12:58:39:117PM | Plasma | Ok | |
| 17 | 01:13:30:710PM | Plasma | Ok | |
| 18 | 01:26:36:290PM | Plasma | Ok | |
| 19 | 02:04:24:707PM | Plasma | Ok | |
| 20 | 02:20:37:783PM | Plasma | Ok | |
| 21 | 02:34:06:207PM | Plasma | Ok | |
| 22 | 02:47:17:800PM | Plasma | Ok | |
| 23 | 03:00:23:473PM | Plasma | Ok | |
| 24 | 03:13:29:470PM | Plasma | Ok | |
| 25 | 03:26:53:847PM | Plasma | Ok | |
| 26 | 03:44:33:723PM | Plasma | Bad | no power shot, actiom monitor hung up. |
| 27 | 03:56:04:940PM | Plasma | Ok | |
| 28 | 04:09:28:020PM | Plasma | Ok | |
| 29 | 04:22:26:363PM | Plasma | Ok | |
| 30 | 04:35:39:267PM | Plasma | Ok | |
| 31 | 04:48:25:143PM | Plasma | Ok | |
| 32 | 05:01:11:817PM | Plasma | Ok | |