Prometheus Fusion Perfection

Let’s explore the world of vacuum pumps! 

Starting with units.

The pascal (symbol: Pa) is the SI derived unit of pressure.

The torr (symbol: torr^[1]) is a non-SI unit of pressure defined as 1/760 of an Atmosphere. 1 torr = 133,322 pascal.

1 mbar  = 0.1 kPa

1 psi  = 6.894757 kPa.

Cubic feet per minute (CFPM or CFM) is a non-SI unit of measurement of the flow of a gas or liquid that indicates how much volume in cubic feet pass by a stationary point in one minute. The lower the CFPM the better the suction. 1 cfm = 4.71945×10^-4 m³ s^-1

Our target vacuum quality is 10^-9 torr, or 1.33322368 × 10^-7 pascals.

Lets look at the different types of pumps:

• Cryopump

• Diffusion pump

• Ion pump (physics)

• Roughing pump (compared)

• Sorption pump

• Sprengel pump

• Toepler pump

• Turbomolecular pump

Now lets take a look at what’s available on ebay:

rotary vane pump here is the spec sheet. possible rough pump.

varian diffusion pump

turbomolecular pump

cryo-trap to prevent back flow from diffusion pump.

I think the idea setup would be chamber -> cryo-trap -> oil diffusion pump -> rough pump.