| Miniproposals | ||||||||||
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| Operators | |
| Session leader(s): | Gary McCracken |
| Physics operator(s): | Robert Granetz |
| Engineering operator(s): | Vinny Bertolino |
| Engineering Operator Run Comment |
| granetz |
| Session Leader Plans |
| Physics Operators Plans |
| Session Leader Summaries |
| Entered: Jul 7 2004 03:49:14:900PM |
| Author: To Be Determined |
| Run Summary 960105 (Friday). MP #113, Boronization of Alcator C-Mod SL G M McCracken PO R Granetz EO V Bertolino Purpose: To run a series of fiducial shots in order to get a good baseline of machine operation before the boronization which is to be carried out on the weekend 6/7 January. It was initially intended that we should carry out the complete program that was planned for the day after boronization. However due to time limitations we just did the five fiducial shots and then a short density scan. In the first plasma shot,#009, the density did not get up to 1e20 until 0.8 s. In the subsequent shots it got to 1e20 at 0.6 s. In shots 13 and 14 we increased the RF power to 2 MW from 0.75 -1.0 s. We then obtained a very marked ELM free H-mode on the H-alpha signals. On shot 15 we injected a Li pellet at 0.75 s and got a weak PEP mode. On shots 16 and 17 we attempted to get a higher density. On shot 16 we got a smooth density ramp from nl04=0.8 at 0.4 s to 1.3e20 at 1.0 s. There was a gradual reduction in the Isat and clear detachment at 1.1 e20. The next shot, 018, there was a somewhat faster density ramp from 0.8 to 1.7e20 over the same time interval. The detachment was even more marked and occured at nl04=1.2e20. It will be interesting to see whether boronization decreases the impurity content and therefore increases the critical density. After discussion with Gunter Esser (KFA Julich) and Earl it was unclear whether we expect to have too much or too little wall fuelling after boronization. We concluded that we should go ahead with the ECDC cleaning in He after the boronization. We ought however to be prepared to have plenty of gas puffing during the tokamak run after boronization. It has been the Julich experience that up to 5 times as much gas as normal is needed for about 20 shots There were some problems with diagnostics. The Mo monitor valve opened only intermittently. We had some data on shots 12 and 16 when the valve opened half way through the shot; otherwise it was shut. It seems to be a problem with the PLC programming and M May is looking into it. The Thomson scatering was not working becuse of problems with stray light. Shot summary: 1-8 PS problems 9 First fiducial shot density low until 0.8 s 10. Second fiducial shot 11. Third fiducial shot 12 Fourth fiducial shot 13 Fifth fiducial shot but with @MW RF power 14 Increase in density to 1.1e20 @ MW marked H-mode 15 Li pellet injection, weak PEP mode 16 Density ramp to 1.3e20. Detachment at 1.1e20 17 No toroidal field 18 Density ramp to 1.7e20. Very good detachment at 0.61 s Program stopped at 12.50hrs in order to give adequate time to set up the boronization |
| Physics Operator Summaries |
| Entered: Jul 7 2004 04:36:55:740PM |
| Author: To Be Determined |
| Physics Operator's summary for run 960105 MP 113-- Boronization run, but prior to any boronization (to get a good baseline) SL: G. McCracken PO: R. Granetz EO: V. Bertolino Today's original run plan will have to be curtailed in order to allow cell access for working on the boronization system. We wish to try the following program today: (0) Check out EF1 and OH1 supplies (1) 5 fiducial shots (2) Density scan at high RF power (3) 1 PEP mode shot with Li pellet Summary: A reasonable amount of useful baseline data was obtained, despite the very limited amount of run time. (Problems with the EFC TMX supplies delayed operation until 11:00, and we had to shut down by 13:00 in order to permit access to the cell for working on the boronization system.) In particular, a good series of 4-5 reproducible fiducial shots was completed, as well as 1 PEP mode shot, and a few higher density shots at Prf=2.2 MW. Scorecard: 10 plasmas 1 fizzle 1 duds (no TF) 6 tests ---------- 18 total Run setup: ECDC in helium before run. Start with fiducial shot 951215040. Deuterium in K-side at 20 psi (used to be A-side), enabled for hybrid. Deuterium in B-top at 5 psi (puff pre-fill), enabled for hybrid. Argon in B-side-lower at 4-5 psi, but not enabled. RF ready to go on first plasma shot. LPI may be used late in the run. Enable the ECE, VUV, Moly monitor, PCX, and TCX valves Detailed shot log: Shot 01 -- OH1 test. Shot 02 -- Fizzle. Br too negative. Chopper TMX's failed. Next shot: increase Br by 1.5 mT (from 0.0055 to 0.007 T) Shot 03 -- Plasma, but disrupted at 0.2 s. No EFC, went vertically unstable. Shot 04 -- EFC test. TMX's failed. Shot 05 -- EFC test. TMX's failed. Shot 06 -- EFC test. TMX's received its gates, but there still was no output. Shot 07 -- EFC test. TMX's received its gates, but there still was no output. Shot 08 -- EFC test. Finally got current in the EFC coils. Shot 09 -- Plasma. Good fiducial shot. Prf=0.9-1.6 MW, nl_04=1.0e20 m-2. No H-modes. Next shot: repeat Shot 10 -- Plasma. Another good fiducial shot. Prf=0.9 MW mostly. Better density control. Still no H-modes. Next shot: repeat Shot 11 -- Plasma. Another good fiducial shot. Prf=0.9-1.6 MW. Maybe a weak L-H transition at 0.99 s. Next shot: repeat Shot 12 -- Plasma. Another good fiducial shot. Prf=0.9-1.6 MW. Maybe a weak L-H transition at 0.98 s Next shot: repeat, except raise Prf to 2.5 MW. Shot 13 -- Plasma. Good H-mode. Prf=2.2 MW. NL_04=1.0e20 m-2. Next shot: raise density to nl_04=1.4e20 m-2. Also tweak gas puff at 0.3-0.35 s to eliminate low level of hard x-rays (at Amanda's request). Shot 14 -- Plasma. H-mode. Prf=2.2 MW. NL_04=1.1e20 before RF, and 1.75e20 during the H-mode. Next shot: Fire lithium pellet at t=0.75 s. Shot 15 -- Plasma. Got lithium-induced PEP mode. No H-mode. Next shot: Raise density to nl=1.5e20 m-2 by adding in extra valve. No lithium injection. Shot 16 -- Plasma. nl_04=1.2-1.3e20 m-2. Prf=0.9 MW only. Next shot: more density and more voltage on extra fueling valve (B-top, pulse-gas-4) Shot 17 -- Dud. No TF. Next shot: try again. Shot 18 -- Plasma. Max nl_04=1.7e20 m-2. Plasma disrupted during rampdown due to high density. RF pulse was only about 0.8 MW for 0.1 s. End of run. |
| Session Leader Comments | |||
| Jan 5 1996 08:26:50:450AM | Gary McCracken | MP 113 Boronizxation of Alcator C-Mod
The objective of this run is to a have a series of fiducial shots prior to the boronization, ie to do what we planned to do yesterday. . This run will then be repeated immediately after boronization. The run plan will follow the shot sequence plan in the MP. 5 standard fiducial shots 6 shot density scan If time permits do an RF power scan | |
| Jan 5 1996 02:42:30:550PM | Gary McCracken | Summary:
After a number of problems with the power supplies we managed to get 5 good fiducial shots, as planned (shots 009 to 013). After shot 9, when the density was low, the density was very constant and reproducible On shots 13 and 14 we increased the RF power to 2 MW and got a marked H-mode. On shot 15 we fired a Li pellet in and got a weak PEP mode. On shots 16 and 18 we tried increasing the density, but unfortunately lost the D antenna. Shot 17 had no toroidal field. | |
| Jan 5 1996 08:44:55:530AM | 960105001 | Gary McCracken | OH coax test for first shot.
OK |
| Jan 5 1996 09:13:33:820AM | 960105002 | Gary McCracken | Fizzle. No chopper.
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| Jan 5 1996 09:23:47:830AM | 960105003 | Gary McCracken | .Early disruption, 0.2 s EFC failed
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| Jan 5 1996 09:52:52:210AM | 960105004 | Gary McCracken | Test shot, EFC only.
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| Jan 5 1996 09:54:12:340AM | 960105005 | Gary McCracken | Test shot, TMX supplies.
They are not giving any voltage. |
| Jan 5 1996 10:33:32:060AM | 960105006 | Gary McCracken | Test shot, TMX supplies.
Still no voltage |
| Jan 5 1996 11:07:44:980AM | 960105008 | Gary McCracken | More EFC tests. Got current in the coils.
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| Jan 5 1996 11:23:52:500AM | 960105009 | Gary McCracken | Try a proper plasma shot.
Worked well. nl04 got to 1e20 at 0.8 s ICRH !MW on D at 0.75 s, 0.75 MW on E at 0.95 s Looks reasonable |
| Jan 5 1996 11:38:16:320AM | 960105010 | Gary McCracken | Second fiducial shot. Looks good but RF power is a little lower.
The density increases more quickly and nl04 reaches 1e20 at 0.6 s Unfortunately the Mo monitor was not enabled for any shot up to now. There appears to be an impurity injection at 0.68 s, according to the bolometers |
| Jan 5 1996 11:44:01:480AM | 960105011 | Gary McCracken | Third fiducial shot. Looks good, very similar to the previous shot.
The density again increases to 1e20 at 0.6 s Mo monitor still not on. |
| Jan 5 1996 11:58:28:950AM | 960105012 | Gary McCracken | Fourth fiducial shot. Looks good, very similar to the previous shot.
The density again increases to 1e20 at 0.6 s Mo monitor on. Big rise in Mo when RF comes on. |
| Jan 5 1996 12:04:45:630PM | 960105013 | Gary McCracken | Fifth fiducial shot. Increased ICRF to 2 MW
Looks good. The density again increases to 1e20 at 0.6 s and then increases further at 0.8 s when the RF comes on . Very marked ELM free H-mode Valve to Mo monitor did not open, but Xrays indicate a large increase in Mo |
| Jan 5 1996 12:17:25:460PM | 960105014 | Gary McCracken | Tried to increase density with 2 MW RF power, but it did not go up
before the RF power came on Large increase in nl04 to 1.8e20 when the RF comes on Reasonable shot Still no Mo monitor |
| Jan 5 1996 12:31:41:810PM | 960105015 | Gary McCracken | nl04=1.4e 20 asked for with 2.5 MW RF power, but it did not go up
before the RF power came on Li pellet injected at 0.75 s. nl04 went up to 2.1e20 Slight indication of a PEP mode. No H-mode Reasonable shot Valve on Mo monitor still did not open |
| Jan 5 1996 12:43:09:450PM | 960105016 | Gary McCracken | nl04=1.5e 20 asked for but only got up to 1.25e20.
RF power down to 1 MW as we lost one transmitter No Li pellet No H-mode Reasonable shot Valve on Mo monitor opened at at 0.63 s |
| Jan 5 1996 12:43:43:520PM | 960105017 | Gary McCracken | No toroidal field , no plasma
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| Jan 5 1996 01:00:07:370PM | 960105018 | Gary McCracken | Asked for nl04=2e20. Turned on valve B top in addition to the feedback
valve. Density got to 1.5e20 at 0.7 s and kept rising up to 1.7e20 at 1.0 s. Reasonable shot. There may be a very weak H-mode at 0.75 to 0.85 s when the RF is on. The RF was only 0.75 MW as D antenna didn't come on Mo monitor valve did not open |
| Physics Operator Comments | |||
| Jan 4 1996 06:23:05:260PM | 960105001 | Robert Granetz | MP 113-- Boronization run, but prior to any boronization (to get a good
baseline) SL: G. McCracken PO: R. Granetz EO: V. Bertolino Today's run plan: (0) Check out EF1 supplies (new transformer, other changes) (1) 5 fiducial shots (2) 6-shot density scan, alternating with fiducial shots (12 shots total), at high RF power (3) 2 RF power ramp shots (0.5-3.0 MW), alternating with fiducials (4 shots total), (4) PEP mode with D or Li pellets (time permitting) |
| Jan 4 1996 06:24:08:490PM | 960105001 | Robert Granetz | Run setup: ECDC in helium before run.
Start with fiducial shot 951215040. Deuterium in K-side at 20 psi (used to be A-side), enabled for hybrid. Deuterium in B-top at 5 psi (puff pre-fill), enabled for hybrid. Argon in B-side-lower at 4-5 psi, but not enabled. RF ready to go on first plasma shot. LPI may be used late in the run. Enable the ECE, VUV, Moly monitor, PCX, and TCX valves |
| Jan 5 1996 08:36:40:940AM | 960105001 | Steve Wolfe | Shot 960105001 -
OH coax test. Setup by Granetz for a fiducial shot; Wolfe filling in as Physop until Bob gets in. Everything looks ok. There was no coldstart, but it looks like the hybrid ran ok on shot 1. |
| Jan 5 1996 09:08:04:560AM | 960105001 | Robert Granetz | Shot 01 -- OH1 test.
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| Jan 5 1996 08:54:21:440AM | 960105002 | Steve Wolfe | Shot 960105002 -
Setup for a fiducial. The basis was apparently 951214040, as set up by RSG. This may end up with too negative a Br (calling for .0055), but we'll give it a try. Fizzle. No chopper, but it didn't make it that far. Lots of negative Br on the flux plot. |
| Jan 5 1996 09:04:17:700AM | 960105002 | Steve Wolfe | For Shot 960105003 -
Increase Br by 1.5mT to .007 Turning back over to Bob Granetz, who has arrived. |
| Jan 5 1996 09:08:17:640AM | 960105002 | Robert Granetz | Shot 02 -- Fizzle. Br too negative. Chopper TMX's failed.
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| Jan 5 1996 09:24:25:950AM | 960105003 | Robert Granetz | Shot 03 -- Plasma, but disrupted at 0.2 s. No EFC, went vertically unstable.
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| Jan 5 1996 09:44:27:660AM | 960105004 | Robert Granetz | Shot 04 -- EFC test. TMX's failed.
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| Jan 5 1996 09:48:24:680AM | 960105005 | Robert Granetz | Shot 05 -- EFC test. TMX's failed.
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| Jan 5 1996 10:22:47:180AM | 960105006 | Robert Granetz | Shot 06 -- EFC test. TMX's received its gates, but there still was no output.
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| Jan 5 1996 11:04:53:500AM | 960105007 | Robert Granetz | Shot 07 -- EFC test. TMX's received its gates, but there still was no output.
|
| Jan 5 1996 11:07:03:190AM | 960105008 | Robert Granetz | Shot 08 -- EFC test. Finally got current in the EFC coils.
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| Jan 5 1996 11:18:41:880AM | 960105009 | Robert Granetz | Shot 09 -- Plasma. Good fiducial shot. Prf=0.9-1.6 MW, nl_04=1.0e20 m-2.
No H-modes. Next shot: repeat |
| Jan 5 1996 11:28:50:530AM | 960105010 | Robert Granetz | Shot 10 -- Plasma. Another good fiducial shot. Prf=0.9 MW mostly.
Better density control. Still no H-modes. Next shot: repeat |
| Jan 5 1996 11:36:40:340AM | 960105011 | Robert Granetz | Shot 11 -- Plasma. Another good fiducial shot. Prf=0.9-1.6 MW. No H-modes
Next shot: repeat |
| Jan 5 1996 11:47:56:500AM | 960105012 | Robert Granetz | Shot 12 -- Plasma. Another good fiducial shot. Prf=0.9-1.6 MW. Maybe a
weak L-H transition at 0.98 s Next shot: repeat, except raise Prf to 2.5 MW. |
| Jan 5 1996 12:00:39:230PM | 960105013 | Robert Granetz | Shot 13 -- Plasma. Good H-mode. Prf=2.2 MW. NL_04=1.0e20 m-2.
Next shot: raise density to nl_04=1.4e20 m-2. Also tweak gas puff at 0.3-0.35 s to eliminate low level of hard x-rays (at Amanda's request). |
| Jan 5 1996 12:15:39:030PM | 960105014 | Robert Granetz | Shot 14 -- Plasma. H-mode. Prf=2.2 MW. NL_04=1.1e20 before RF, and
1.75e20 during the H-mode. Next shot: Fire lithium pellet at t=0.75 s. |
| Jan 5 1996 12:23:48:180PM | 960105015 | Robert Granetz | Shot 15 -- Plasma. Got lithium-induced PEP mode.
Next shot: Raise density to nl=1.5e20 m-2 by adding in extra valve. No lithium injection. |
| Jan 5 1996 12:37:32:690PM | 960105016 | Robert Granetz | Shot 16 -- Plasma. nl_04=1.2-1.3e20 m-2. Prf=0.9 MW only.
Next shot: more density and more voltage on extra fueling valve (B-top, pulse-gas-4) |
| Jan 5 1996 12:41:57:180PM | 960105017 | Robert Granetz | Shot 17 -- Dud. No TF.
Next shot: try again. |
| Engineering Operator Comments | ||||
| Shot | Time | Type | Status | Comment |
| 1 | 06:22:33:080PM | Test | Ok | |
| 2 | 08:48:43:200AM | Plasma | Bad | no chopper |
| 3 | 09:10:48:620AM | Plasma | Bad | no efc's |
| 4 | 09:36:21:200AM | Test | Ok | |
| 5 | 09:45:40:540AM | Test | Ok | |
| 6 | 10:15:03:000AM | Test | Ok | |
| 7 | 10:27:05:470AM | Test | Ok | |
| 8 | 11:03:44:400AM | Test | Ok | |
| 9 | 11:13:17:670AM | Plasma | Ok | |
| 10 | 11:22:32:930AM | Plasma | Ok | |
| 11 | 11:30:57:610AM | Plasma | Ok | |
| 12 | 11:39:47:960AM | Plasma | Ok | |
| 13 | 11:52:37:540AM | Plasma | Ok | |
| 14 | 12:03:38:110PM | Plasma | Ok | |
| 15 | 12:16:12:740PM | Plasma | Ok | |
| 16 | 12:30:30:410PM | Plasma | Ok | |
| 17 | 12:39:20:570PM | Plasma | Bad | TF did not fire |
| 18 | 12:46:39:710PM | Plasma | Ok | |