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System Leak Check Procedure and Observations

Report from 3/19/2012 on ion gauge functionality, RGA usage, testing observations, pressure measurements, and next steps for leak detection. Details include helium background, gas increase with valve actuation, and recommended final test with a helium leak detector.

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System Leak Check Procedure and Observations

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  1. Burle Leak Check3/19/2012 Jeff Williams Jun Xie

  2. System Info • Ion gauge not functional due to baratron issues • Use RGA to view He background and total system pressure • Initial test performed last week 3/15/2012 on bottom side components, oven was on precluding chalice test • Chalice tested 3/19/2012, and a 2nd test of other components also done at that time • Pressure in the low 10 -7 Torr range on 3/19 after weekend pumping

  3. Observations • No change in helium background during testing in static condition • There is an increase in helium and other gases (H2, N2) when hi vac valve is actuated (closed) • Pressure increase from approx. 2E-7 to 2E-6 in 10 minutes with hi vac closed • No discernable difference in level of helium increase whether helium just sprayed in the valve area or not prior to valve actuation

  4. Next Step • Do one final test with a helium leak detector • Close hi vac valve and record pressure vs. time. If outgassing, the rate of rise should decay over time. If a leak is present the rate of rise should remain consistent.

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