CryogenicHandling

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Cryogenic Handling

liquid Nitrogen

Most of our cryostats and cryo-magnets have an outer liquid nitrogen jacket to reduce the heat load on the helium bath. The storage dewars are prepared by the sample environment staff and can be picked up at the preparation area (between FOCUS and MARS). The dewars provided are self pressurizing systems with a mechanical level indicator at the top as shown below. LN2_dewar_schematics

The dewars are always pressurized.

  • Ensure that the hose is firmly connected to the vessel and the nozzle is not pointing towards a person before opening the valve.
The filling hoses have a metallic protection sleeve. The valves and the hose get very cold during a nitrogen transfer.
  • Make sure that you wear protective leather gloves when handling cold parts.

When using the automatic nitrogen refill

  • test the automatic to assure that the filling hose remains in the cryostat filling port and that the system switches off correctly

LHe_dewar

He_gas_line

CCU

Attachments:  HeDewar.png  gasline.png  CCU.png  transportstraps.png  afterfill.png  cl_clpb.gif  LN2.png  HeDewartransport.png 
This particular version was published on 07-May-2012 12:36:42 UTC by Bartkowiak.