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Burle Leak Check 3/19/2012

Burle Leak Check 3/19/2012. Jeff Williams Jun Xie. 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

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Burle Leak Check 3/19/2012

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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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