Alcator C-Mod Run 1090921 Information

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Miniproposals
Miniproposal:475
Date Filed: 3/23/2007
Title:Cryopump Startup
First Author:Brian Labombard
Session Leader:Dennis Whyte (shots 1-1)

Operators
Session leader(s):Dennis Whyte
Physics operator(s):
Engineering operator(s):

Engineering Operator Run Comment
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Physics Operators Plans

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ShotTimeTypeStatusComment

System Availability
Sep 21 2009 02:30:29:733PM
Cyropump pumping speed calibration versus pressure

Injecting D2 with Ninja and gate valves closed

Cryo warm

Ninja on for 5 seconds
Ninja plenum pressure: 1067 Torr

Pump pressure gauge: 38.0 mTorr after 5 seconds

Ninja plenum pressure gauge was not working


Sep 21 2009 02:37:46:937PM

Cryo warm

Ninja on for 5 seconds
Ninja plenum pressure: 1040 Torr

Pump pressure gauge: 34.9 mTorr after 5 seconds

Ninja plenum pressure: 1 second 31.77 torr-l
4 second 105 torr-l

so 24.41 torr-l/s for 122.05 Torr-L injected (Ninja plenum pressure
saturated)

Suggested volume: 122.05 Torr-L / 34.9 mtorr = 3.5 m3




Sep 21 2009 02:59:16:720PM
Cryo warm

Ninja on for 3 seconds
Ninja plenum pressure: 2170 Torr

Pump pressure gauge after 3 seconds: 68.7 mTorr






Sep 21 2009 03:06:46:327PM
Cryo cold

Cryo pressure: 1.53 mTorr

Compare to reference injection shot: 902






Sep 21 2009 03:09:09:157PM
Cryo cold

Cryo pressure: 4.53 mTorr

Compare to reference injection shot: 904