Notes on ultra-high vacuum technique

The HV delivery conduit was welded to the outer hatch of the cryostat, about 1.5 m away from the TPC, where it was terminated with a warm seal using a Swagelok compression fitting around the polyethylene dielectric of the cable, which created a He-tight seal.

Testing Silicon Photomultipliers with Vacuum-Ultraviolet Light for nEXO

RGA doesn’t work the way I intuitively expected. Unlike a desktop GCMS, there is no component that causes different species to show up at the mass spec at different times - instead you get a mish-mash of all the different species all at the same time, and the interpretation is done using fragmentation / cracking ratios and isotope ratios

https://indico.cern.ch/event/565314/contributions/2285748/attachments/1467497/2273709/RGA_tutorial-interpretation.pdf

in the common practise, the gas species of the residual gas are mixed and
cannot be separated easily and quickly. We do not have a separation equipment in front
of the gas analyser as it is the case in analytical chemistry, for example in chromatography.

In baked system, the absence of peak 32 does not imply the absence of
leaks; baked stainless steel walls adsorb oxygen.

Reducing the field axis voltage leads to the suppression of the gas ions; in this way, only the ESD spurious peaks are detected.