Rigaku: Vacuum Pumps

The turbo pump allows good vacuums, necessary for some high-temperature experiments. Having a turbo pump reduces the effects of outgassing. In principle the turbo pump can be connected to either oven, though the original intent was for the Parr 1200 oven (I’m not sure why).

Image: turbo_pump

This is the turbo pump assembly, which can be attached to either oven using the vacuum flange at the left end. The roughing pump must be attached to the turbo at the right end. There are three electrical connections: one to the vacuum gauge cable, one to the turbo pump controller, and one for the fan that cools the turbo pump.

The fan power wire and the turbo pump connector have to be threaded out the back of the XRD housing to reach their sockets. The following are instructions given to me by the Rigaku installers. See instructions to see if they are right.

In normal operation, set-up and close the oven. Then close the air bleed valve and open the vacuum isolation valve. Turn on the roughing pump, vacuum gauge, and turbo controller. Wait until the vacuum gauge reads 0.01 millibars, then start the turbo. Check that everything is running and that the vacuum is coming down.

After running your experiment, turn off the turbo pump and wait for it to stop. Close the vacuum isolation valve, and open the bleed valve to vent the oven. The roughing pump can keep running.

For the next experiment, close the bleed valve, slowly open the isolation valve, and turn on the turbo pump when again the pressure reads 0.01 millibars. Repeat as necessary.

When completely done, turn off the turbo pump and wait for it to stop. Then turn off the roughing pump, and vent the whole system using the bleed valve. Turn off the turbo pump controller and vacuum gauge.

Image: turbo_controller_power_supply

This shows the turbo pump controller/vacuum gauge box and power supply box. I think the turbo pump is entirely controlled and monitored by these two boxes.

Power for them comes from the two circled plugs. Connect the plugs to the top outlets to use the turbo with the Parr 1200 oven, and to the bottom outlets for use with the Parr 600 oven.

Image: metal_vacuum_line

The metal vacuum line should be hanging up on the inside of the XRD housing. It can be connected to the front of either oven, or to the turbo as a roughing pump.

Image: vacuum_pumps

The two rotary vacuum pumps are behind the XRD. Arrows point to on/off switches. The large gray pump has the big metal vacuum line, and the small silver pump has the thin black one with a coiled part near the end, inside the XRD housing.

The large gray pump is for evacuating the ovens. The small silver pump is just to evacuate the vacuum path for small angle scattering work.