Cryostats
1.5 K cryocooler features
- Top-loading static helium thermal exchange gas configuration
- Pulse tube closed-cycle cryocooler design allows nearly unlimited unattended operation
- Independent recirculating helium gas loop cools the sample chamber to 1.5 K without the use of liquid helium
- Choice of cryocooler to match performance and budget requirements
- Optimized for two-loop temperature control. Helium thermal exchange gas is heated and controlled by one heater and calibrated silicon diode, while a second heater and sensor on the sample mount enable rapid temperature sweeps and precise sample temperature control.
- Sample is accessed by removing the top-loading sample positioner
- Four orthogonal sets of windows can be used in either transmission or reflection geometry (PTSHI-950-LT)
- Non-optical tails (PTSHI-950T-LT)
- O-ring sealed ports accept DC and RF electrical feedthroughs
- Optional DC and RF wires and cables for electrical measurements
4 K cryocooler features
- Top-loading static helium thermal exchange gas configuration
- Closed-cycle cryocooler design allows nearly unlimited unattended operation
- Choice of cryocooler to match performance and budget requirements
- Optimized for two-loop temperature control—helium thermal exchange gas is heated and controlled by one heater and calibrated silicon diode, while a second heater and sensor on the sample mount enable rapid temperature sweeps and precise sample temperature control
- Sample is accessed by removing the top‑loading sample positioner
- Four orthogonal sets of windows can be used in either transmission or reflection geometry (SHI-950-XX)
- Non-optical tail can be inserted into the pole gap of an electromagnet or into a room temperature bore superconducting magnet (SHI-950T-XX)
- Non-optical tail fabricated from either thin-walled aluminum or vanadium for use in neutron applications (SHI-950T-NEUTRON-XX)
- O-ring sealed ports accept DC and RF electrical feedthroughs
- Optional DC and RF wires and cables for electrical measurements
10 K cryocooler features
- Top-loading static helium thermal exchange gas configuration
- Closed-cycle cryocooler design allows nearly unlimited unattended operation
- Choice of cryocooler to match performance and budget requirements
- Optimized for two-loop temperature control; helium thermal exchange gas is heated and controlled by one heater and calibrated silicon diode, while a second heater and sensor on the sample mount enable rapid temperature sweeps and precise sample temperature control
- Sample is accessed by removing the top‑loading sample positioner
- Integrated pneumatically isolated support stand minimizes line broadening due to sample vibrations
- O-ring sealed ports accept DC and RF electrical feedthroughs
- Optional DC and RF wires and cables for electrical measurements
SuperTran features
- No vacuum pump is required for temperatures over 4.2 K
- No heating of exhaust gas required
- Monitoring of flow rate is 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 quartz window sets
- Optical sample holder
- Calibrated temperature sensor
- Pressure relief valve
- Sample positioner with one 10-pin and one 8-pin electrical feedthrough
- 6 ft superinsulated cryogen transfer line
- Control heater
- System test
All SVT cryostats Include:
- SuperVariTemp system
- Top-loading sample positioner
- One 10-pin and two 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 SuperVariTemp system, with an optional calibrated temperature control sensor 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 are 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)
- Silicon diode sensor and heater (thermocouple for VPF-800)
- Electrical feedthrough for thermometry
- Optical sample holder
- Refill assembly for continuous operation
- Complete system test
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