Cryostats

Special Features and Benefits:

• No vacuum pump required for temperatures over 4.2 K
• No heating of exhaust gas required
• Monitoring of flow rate not required
• Easily adaptable to a He recovery system
• Highly flexible transfer line with a minimum 12 in bend radius

Standard configuration includes

• Optical vacuum shroud
• Optical radiation shield
• Four (4) quartz window sets
• Optical sample holder
• Temperature sensor
• Pressure relief valve
• Sample positioner with one (1) 10-pin and one (1) 8-pin electrical feedthrough
• 6 ft superinsulated cryogen transfer line
• Control heater
• System test 

All SVT Models Include:

• Janis Research SuperVariTemp system
• Top-loading sample positioner
• One (1) 10-pin and two (2) 8-pin electrical feedthroughs
• Safety pressure relief valve
• System test

Standard System Features:

• Top sample loading and exchange at all temperatures
• Effortless sample rotation and translation about the vertical axis at all temperatures, with options for rotation about a horizontal axis
• Field-independent thermometry
• The Janis SuperVariTemp system, with provision for a temperature control thermometer at the heat exchanger
• Vapor cooled/superconducting high current magnet leads
• Superconducting magnets with persistent mode operation providing field stabilities of 20 ppm/h
• Carefully designed magnet support inside the helium reservoir, with optical access through the Dewar vacuum space (OptiMag and SuperOptiMag systems)
• Built-in superconducting liquid helium level sensors, providing continuous or timed level monitoring
• Readily accessible and interchangeable sample chambers

Standard Features:

• Pulse tube or GM cooler
• Cryocoolers with 1 W, 1.2 W, 1.5 W or 2 W cooling at 4.2 K available
• Compact tabletop size
• Adjustable working distance
• Multipin electrical feedthrough
• Control heater and thermometer
• Integrated gas handling system
• Dry scroll pump for gas circulation

VNF Series features:

• Quick refill capability with included funnel assembly 
• High-quality bellows-sealed evacuation valve and a built-in cryopump for maintaining high vacuum
• Safety pressure relief valves protecting all independent spaces
• 1.25 in diameter sample tube with customer-specified optical access (standard system offers four quartz window pairs with f = 1.0 optical access to the sample space)
• Top-loading sample chamber for rapid sample exchange
• Variable cooling system that places the sample in flowing N₂ vapor (ideal for low thermal conduction samples), providing excellent cooling power and temperature control
• Lightweight sample positioner/mount assembly, with multi-pin electrical feedthrough access to the window region, offering rotation and translation around the cryostat axis
• Two silicon diodes installed on the vaporizer (heat exchanger) and sample mount for controlling and monitoring the system temperature

VPF Series features:

• Fused quartz windows
• 4-way optical access (f = 1.0)
• Si diode thermometer and heater (thermocouple for VPF-800)
• Electrical feedthrough for thermometry
• Optical sample holder
• Refill assembly for continuous operation
• Complete system test