Hi everybody,
I hadn't helium leak detector, because of high cost. So far I detected
"holes" using primitive methods (by acetone, alcohol) but it wasn't easy.
My friend gave me old russian 180 angle mass spectrometer for helium
leak detector. Inside is simple ion source and faraday's cap. Old vacuum
tube preamplifier was bad, that's why I build my own.
Power supplier for ion source and detecting circuit is my own too.
Yesterday I throw out original magnets (it was very heavy -ca 12kg) and
changed to neodymium magnets.
This detector could be connected to high vacuum system, as it shown here:
http://www.youtube.com/watch?v=ZiuF6uGHABU
Best regards
Alek
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