I had an impromptu meeting/tour with Maty Lesovsky. The following are the notes I took
Good needle valves for bringing things up to pressure
All metal angle valves
Avoid rubber oring
10^-10 l mbar/s cm^2 is LIGO’s desorption
Have metal bake out site
All metal bake out valves
KJL has rubber o ring which sucks in contaminants
Varian is a good brand
VAT makes large ones
Use research grade N2 if you want to backfil
Can hook up to needle valve
Clean air cheaper
They have an SRS RGA 200
Realistically only gets to 100 amu
Hanford uses 1000, but this SRS should be plenty
Have custom controllers for bake out
8 W/ft
Takes 110-220 V
PID controller from computer, can tell ramp time and other parameters
They have prints of the circuits
They have thermistors on the outside
Get surface temperature, not in air
Tac weld for surface temperature
Omega or McMaster
They also have insulation we can use
200°C is standard for small stainless
This is 150°C because it’s so large
They think they’ll keep the turbo on during the bake out
Biggest concern is machining oils
Fiberglass tape (from McMaster)
Goes up to 300°C
Great for holding thermocouples
Has gone through hundreds of bake outs over years, been fine
Avoid fiberglass insulation
Iwata Scroll Meister pumps, equivalent to the IDP-7
Tri scroll
Have mufflers to trap chemicals out of them
Smart to have a safety shutoff in case you lose power
Cut power to turbo
Choke turbo if it comes back on with pressure
Do a rate of rise test on partial volumes and the whole system
Good to test if something is degrading
Have a battery backup for a couple hours to run the turbo so the turbo breaks don’t wear out
For controllers, have Terranova Model 934 wide range which are good
MKS PDR 2000 also nice and easy
Invest in a case to display everything
They have a lab view program to monitor the pressure and the RGA