The ARS manufactured CS204B is a medium cooling power, true UHV cold head (10-11 Torr) where all of the rubber o-ring seals have been replaced with welded joints and metal seals. A CF flange is welded directly to the cryocooler.

This true UHV system is bakeable to 80 C, and the 10 K CS204AB is bakeable to 200 C if the displacer is removed. (Special training required.)

Cold tip extensions are available to put the sample right where it is needed in the chamber.


  • UHV
  • Surface science
  • UHV manipulator for XYZ motion
  • Photoemission spectroscopy
  • Nozzle cooling



Typical Configuration


Options & Upgrades

  • True UHV (10-11 Torr)
  • Bakeable
  • Open sample space
  • Optional cold tip extensions
  • Cryogen free
  • Operation in any orientation
  • Fully customizable


  • Cold head (DE-204AB)
  • Compressor (ARS-4HW)
  • 2 helium hoses
  • True UHV welded stainless steel instrumentation skirt with 6 in. rotatable CF flange
  • Nickel plated OFHC copper radiation shield terminating 0.125 in. short of the cold tip
  • Instrumentation for temperature measurement and control:
    • 10 pin UHV feedthrough
    • 50 ohm thermofoil heater
    • Silicon diode sensor curve matched to (± 0.5 K) for control
    • Calibrated silicon diode sensor (±12 mK) with 4 in. free length for accurate for sample measurement
  • Wiring for electrical experiments:
    • 10 pin feedthrough
    • 4 copper wires
  • Sample holder for optical and electrical experiments
  • Temperature controller