LIGO Document E1500248-v1

Helium Leak Test Procedure for the TMDS Ionizer Assembly

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E - Engineering documents
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This is a general procedure for performing a total (Helium) leakage rate measurement of a vacuum vessel (namely the TMDS Ionizer Assembly, D1400331). Steps for localizing a leak (if one is present) and fixing the leak are also addressed.

1) Procedure in v1 does not mention the zeroing. Refer to page 42 and 43 in the manual (at link below or in other files for how to integrate use of "zero"
2) With reference to the 2x attached pictures (in other files) there is no need to bag hose or hose clamps (as these can leak) and this is not clear in v1 of the document.

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