Oxford Cryo-Cooler


  1. Normal Operation
  2. Cryostream
  3. Temperature
  4. Directions for Filling the Large Dewar

Normal Operation of the Cryo-Cooler:

  • The dewar inside the hutch is automatically filled.
  • The large dewar (outside the hutch) is filled by technicians on a weekly basis, however, you may have to fill it, if for some reason the dewar becomes empty (see directions below).
  • The heating shield should be installed.
  • Do not let the cold stream strike the phi axis mount; this will eventually cause the phi axis to loose steps!


Alignment pin

Check to see if the cryostream is centered by mounting the alignment pin found on the tool shelf.

  • Move the beamstop out of the way and mount your pin on the goniometer head.
  • Center the pin.
  • If necessary, adjust the x or y micrometers to center the stream on the tip of the pin.
  • The tip of the pin should be approximately 8-10 mm from the end of the nozzle. This can also be adjusted with the z micrometer.


  • If you want to reset the the stream settings simply turn the power off on the cryojet controller, wait a few seconds and turn it on again.

Directions for filling the Large Dewar:

The 180 large dewar is normally filled by a technician, however, if the level on the auto fill drops below 80%, the tank may have to be filled.

  1. After closing the gas and liquid valves, disconnect the liquid fitting marked in red (a wrench is located near the tank).

  2. Disconnect the gas connection by pushing up the lever, and then pulling out the gas hose.

  3. Moving carts are stored in building 131 just past the nitrogen fill station near a group of nitrogen tanks. (contact the duty operator if you can not locate a cart.)

  4. Disconnect the earthquake brace.

  5. The liquid nitrogen fill station is located in building 131 just past beam line 9, find the room by looking for the big beige doors.


    Detailed directions for filling the tank are posted in filling room. Remember to rotate the valves back a quarter turn, or the valves may be difficult to close.

  6. To disconnect the tank after filling, you may need to warm up the connections with a heat gun.

  7. When you return the tank to the beam line make sure to reattach the earthquake bracing.

  8. Reconnect the fittings, but do not over tighten them.

  9. Open the liquid and gas supply valves.

  10. Check the fittings for leaks.

Back to Cryocrystallography at SSRL