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Operation

The Microstat®He works on a continuous flow principle using an oil-free pump to draw liquid helium from a storage vessel along a transfer tube to the Microstat® heat exchanger. Temperature control is achieved by a combination of manual helium flow control and power dissipated in an electrical heater, regulated using a temperature controller.
The cryostat can also be used in "push mode", in that case the flow of liquid helium is generated by pressurising the storage dewar. The advantage is that the need for a gas flow pump is removed thus saving cost and eliminating the noise and vibration generated by the pump.

The MicrostatHe can also be operated with liquid nitrogen as coolant for measurements to 80K.

• Key Specification

Options

• Windows: A wide range of window materials can be fittedto the MicrostatHe®
  Standard window thickness is 0.5mm with clear 10mm access diameter. We also offer an option for a 25mm access diameter window with a thickness of 1.5mm
• Transmission experiments require an alternative bottom flange with a second window fitted and a transmission sample holder
• Pump options. A simple oil-free vane pump GF4 is supplied for operation to 3.2K. Lower temperatures (to 2.2K) require a single stage rotary pump (EPS40)
• Temperature controller. Choose either a benchtop, single channel ITC601 or the more flexible single or 3 channel ITC503 (rack mounted)
• Transfer tubes: All systems are supplied with a low loss transfer tube (link to page on transfer tubes)(LLT600 or LLT 700) for minimum helium consumption (less than  0.45L/hr at 4.2K!)

Note: an Automated  needle valve can be fitted to the LLT to allow automation of the helium flow regulation and optimisation of the  helium consumption.

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