Miniproposals

Engineering Operator Run Comment

Cycle, Scanner and Gas System Tests

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Physics Operator Summaries

Entered: Feb 2 2006 04:01:20:763PM

Author: Steve Wolfe

Cycle and Gas tests SL: Irby EO: Dekow PO: wolfe We ran off four test cycles. The purpose of today's exercise was to 1) Verify operation of the cycle and data system in advance of next week's operation 2) Test the possibility of puffing diborane into a discharge. The main issue tested is whether we need a plenum or can just puff from the line, and what PLC programming changes might be needed 3) Verify that some new features in dpcs aren't going to break the cycle 4) Check out some of the data acquisition system 5) Verify that the gate valve toggling is still working All the tests went well. The "diborane" valve was wired to the output from the B-side upper piezo driver by moving the cable in the cell (near B-port). The line pressure indicated 31psi. Tests were run using programmed V waveform on PG2 in PCS. The fizzle detector gate was delayed until 1.7sec. A programmed 100V pulse from 0.3sec to 2sec was terminated successfully at 1.7sec by the dpcs_fizzle async routine in dpcs; the hardware fizzle detector presumably took out the valve permissive shortly thereafter. The pressure rise with this long pulse was enough to switch off the ion gauges. The divertor pressure manometer peaked out at ~33mTorr. We also took shots with durations of 1.0 and 0.5sec, resulting in machine pressures of 23 and 12mTorr; it seems to be pretty linear. The rise rate is about 20mTorr/sec with a slight delay after the valve is energized. In order to get the diborane line to fill it was necessary for Joe to defeat the logic that requires the torus ion gauge to be off. Since we wanted to be able to watch the pressure (and we were just puffing He), this was necessary. Whether we want to expose the ion gauge to diborane during operation is a question that remains to be answered. The only problem with the cycle was that Pat's voice wasn't announcing until we restarted the routine on cmodws02, which was acting a little funny until we moved the keyboard. She was on the air for the first shot. The camac signals from the gas valve drivers were disconnected for the first shots. Joe and Yuri recovered these (again). Ratiomatic was there and working from the beginning. There were no data system problems. The dpcs_fizzle routine seems to be working as intended. The dpcs_init was taking 28 to 29sec, which is consistent with off-line testing results. The response to the fizzle gate is immediate. There is a one sample glitch on the digitized output (on the dt200_1, at 50kHz) that may or may not be a real transient. Gate valves were closed in pulse on shot#4. Seemed to work. Jim was also running the rga in run mode, so we should have before and after data. The i2t circuits were operational and their interlock had to be bypassed since there were coils above -25C (we're still baking). An ok test. After the "run" the cabling on B-side upper and the diborane system was restored to normal, and I put back a more normal (200msec) puff on the PG2.

Session Leader Comments

Physics Operator Comments
Feb 2 2006 12:21:22:097PM	1060202001	Steve Wolfe	Shot#1: Got plenty of gas (shut the gauge off) Ratiomatic reached .002 gauge and went into caniptions at ~1sec. next shot: back down on pg2
Feb 2 2006 03:24:30:357PM	1060202001	Steve Wolfe	Getting set up for cycle tests. We are going to be testing gas puff through the diborane valve. FOR PURPOSES OF THIS TEST - B-side upper (pg2) cable has been connected to the diborane piezo. There is no diborane installed. There is a helium bottle in the diborane cabinet for testing purposes. I will draw a long pulse in seg2 on pg2 (300ms to 2.2sec) Fizzle detector gate should start at 1.7sec I have dpcs_fizz enabled, so I should see the waveform go to zero at 1.7sec Load at 2-Feb-2006 11:59:14.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done
Feb 2 2006 12:36:39:060PM	1060202002	Steve Wolfe	Shot#2: pg2 program off at 1.3sec (still starting at 0.3) Gauge turned off again. Div pressure gets to 20mTorr. I'm not seeing a signal on the bside-upper digitizer. I guess that digitizer is actually on the valve, not on the driver? Or maybe the cable aren't connected again.
Feb 2 2006 12:50:23:727PM	1060202003	Steve Wolfe	Shot#3: No program change. Jim wants to try toggling gate valves. Joe and Yuri are looking for the valve drive signals in the cell. Yes, they were disconnected; Gary blames the HIREX move (instead of LH) this time. Turned off the gauge again. This time we've got signal on the valve driver camac for B-side upper (really the diborane valve) next shot: back the pg2 puff back to 500msec
Feb 2 2006 01:14:00:077PM	1060202004	Steve Wolfe	After the last shot, put the pg2 waveform back to ending at .5sec, so we don't leave a long pulse around for tests next week. I'll probably change it by then anyway, but load this for now so we're somewhat back where we were. Load at 2-Feb-2006 13:13:33.00 Open tree /home/wolfe/pcs_scratch -1 Open tree done
Feb 2 2006 04:06:49:280PM	1060202004	Steve Wolfe	Shot#4: back the pg2 puff from 0.3 to 0.8sec got around 11 or 12 mTorr on the divertor pressure gauge F-side pressure is saying ~4.5, but that's a ratiomatic and the gauge factor for He is lower. I think we're done with these tests.

Engineering Operator Comments
Shot	Time	Type	Status	Comment
1	12:16:45:753PM	Test	Ok	Cycle, Gas and Sanner test
2	12:28:01:563PM	Test	Ok	Cycle, Gas and TF Scanner test
3	12:46:15:743PM	Test	Ok	Cycle, Gas and TF Scanner Test
4	12:57:09:460PM	Test	Ok	Cycle, Gas and TF Scanner
5	11:47:00:810AM	Test	Ok	EFC Chopper Test 400V
6	11:56:19:073AM	Test	Ok	EFC Chopper Test 400V
7	12:05:13:930PM	Test	Ok	EFC Chopper Test 600V