Ari D. Palczewski, PhD SRF Staff Scientist 09/12/16

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Presentation transcript:

Ari D. Palczewski, PhD SRF Staff Scientist 09/12/16 Design and first use of the slow venting apparatus for NL12 warm girders and future improvements Ari D. Palczewski, PhD SRF Staff Scientist 09/12/16

Slow venting and slow pump down Both designed to minimize particle migrations from “dirty” to “clean system” or within clean/dirty system. Both designed to keep gas below laminar flow in clean environment. Both ideally have a diffuse path for gas before reaching sensitive area.

Slow Venting used for Girder Helium or Nitrogen inlet, (hopefully pre-cleaned) Vacuum 1 atm overpressure popoff Connector to girder valve MOTT 0.003μm ~ ultrapure gas filter 0.019Cv metering valve (swage BMG) MOTT 0.003μm ~ ultrapure gas filter Controlled by hand to vent rate of 7.6Torr/min ~ 10 turns on needle while looking at convector gauge – erring on the slow side (no diffuser)

Slow pump-down system – standard system, same type of system used on girder Max pump-down rate flow ~1L/min Not controllable Turbo on by hand below 10Torr pressure To item being pumped Metering valve 0.3Cv Scroll pump for rough pumping

New cleanroom system Stand alone PLC controller for pump down and venting with real-time feedback Slow venting(not shown) has a diffuser at inlet to disperse gas.