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UCL Department of Space and Climate Physics

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20 Kelvin Vacuum Cryostat

MSSL have comprehensive thermal vacuum and cryogenic vacuum facilites used for qualification and acceptance testing of flight hardware.

The MSSL 20 Kelvin vacuum cryostat is a multi shroud design.

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The vacuum cryostat is 900 mm long by 600 mm diameter and comprises of:
  • Outer stainless steel (type 304) chamber
  • An outer electroless nickel plated aluminium chamber
  • An outer G10 chamber
  • An inner electroless nickel plated aluminium chamber
  • An inner G10 chamber
  • An electroless nickel coated aluminium chamber which houses the flight hardware
  • A pulse cooler with extended cold head
  • A single piece construction gold coated copper strap which acts as an interface between the pulse cooler cold head and the instrument mounting base
  • An inner and outer beam CaF2 input/output window system designed to minimise the external environment influences

 This type of chamber design allows for efficient thermal de-coupling of the external environment to the flight harware instrument mounted in the cryostat.

Specification

Dimensions: 1m diameter by 1.1m long.

Hardware mounting area: 0.4m diameter by 0.6m height

Base vacuum pressure: 5 x 10-5 mBar.

Temperature range: 20K to 360K

Temperature control: Closed loop PID control, +0.2K -0.2K.

Temperature measurement: Eight Cernox sensors.

Temperature and pressure logging: 8 channel plus pressure logging, user set logging interval.

Electrical feedthroughs: Various Micro D-Sub connectors