LT3B Helium Flow Cryostat

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The ARS manufactured LT3B Helitran® is a true UHV cold head (10-11 Torr) where all of the rubber o-ring seals have been replaced with welded joints and metal seals.

Like all of our LT3 liquid helium flow cryostats, the LT3B is an advanced liquid helium flow cryostat utilizing many unique features, such as the matrix heat exchanger and the co-axial shield flow transfer line, to achieve unparalleled efficiency and ultra low vibration levels.

The combination of true UHV and angstrom level vibrations makes the LT3B ideal for low temperature STM applications.

For UHV surface science where very long cold fingers are required, we have the LT3M with customizable length up to 1200 mm and rigid support tube to allow for cleaving and manipulation.

Applications

  • UHV
  • STM
  • Surface science
     

Features

 

Typical Configuration

 

Options & Upgrades

  • True UHV (10-11 Torr)
  • Bakeable
  • Open sample space
  • Optional cold tip extensions
  • Liquid helium flow
  • Matrix heat exchanger for high cooling efficiency
  • Co-axial shield flow
  • 4 K liquid helium operation (1.7 K with pumping)
  • 0.7 LL/hr liquid helium consumption at 4.2 K
  • Liquid nitrogen compatible (77 K operation)
  • Angstrom level vibrations
  • Precision flow control
  • Exhaust heater
  • Operation in any orientation
  • Fully customizable

 

  • Cold head (LT3B)
  • Co-axial shield flow liquid helium transfer line
  • True UHV welded stainless steel instrumentation skirt with 2.75 in. rotatable CF flange
  • Dewar adapter
  • Flow meter panel for helium flow control and optimization
  • 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
    • 36 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 sample measurement
  • Wiring for electrical experiments:
    • 10 pin UHV feedthrough
    • 4 UHV rated copper wires
  • Sample holder for optical and electrical experiments
  • Temperature controller