UHV (STM) JT Cryostat

The UHV (STM) JT (Joule Thomson) Cryostat is a JT stage (< 1 K) mounted on an ultra-low loss helium bath cryostat with a nitrogen shield and two vapor cooled radiation shields for added performance. The system was initially conceptualized for STM, TEM and AFM measurements, whereby ultra-low vibrations are required for atomic resolution. The JT stage allows the system to work down to 450 mK (³He) or 1.0 K (⁴He), with little to no additional helium consumption. With its high performance and compact design, this system is a staple of the SPM community. As with all our systems, the UHV JT Cryostats can be modified to best suit your individual needs.

Technical specifications

• Fully UHV / XHV compatible, can be baked up to 150°C
• SPM / STM / AFM compatible
• Base temperature: 450 mK (³He) or 1.0 K (⁴He)
• The JT stage can be used in both continuous or single shot mode
• The same system can be used with either Helium 4 or Helium 3 (without modification to the cryostat)
• Compact design: 10 LHe / 21 LN₂ configurations
• Ultra-low cryogenic consumption LHe / LN₂: > 120 hours and > 250 hours hold time, respectively
• The JT stage does not have a hold time in continuous mode
• DN250 / 300CF base flanges, for easy integration
• Fully customizable cold plate, radiation shield, and design

Upgrades

• Additional geometries and tank volumes available
• Tubes for cabling through the LHe tank
• Additional DN40CF or DN16CF flanges for
  customized wiring
• Passive air damping system fully integrated into the helium system
• Low vibration N₂ tank via an optimized unique design
• Fully compatible UHV split pair superconducting
  magnet with ultra-low loss HTS / LTS current leads
• Radiation shields with integrated shutters, optical and sample transfer access
• Linear push and / or pull mechanism at the tip sample position
• Helium 3 Gas handling system