Microstat®He2 Rectangular Tail liquid helium optical cryostat with narrow tail

MicrostatHe Rectangular Tail liquid helium optical cryostat with narrow tail

A liquid helium cooled, vacuum loading continuous flow (CF) cryostat with a special narrow tail for optical microscopy and spectroscopy measurements requiring:

Small working distance
2.2 - 500 K temperature range
Optical access in two orthogonal directions
Integration into an electromagnet
Operation in any orientation

The core "cold unit" of the MicrostatHe2 Rectangular Tail, MicrostatHe2 and OptistatCF-V is inter-changeable, enabling a modular set of optical cryostats for different experimental set-ups by swapping only the outer body.

Specifications
System options
Operation
Applications
New accessories

Microstat®He2 Rectangular Tail Specifications

Optical specifications	Window thickness 1.0 mm
Clear access diameter	20 mm
Sample holder to window top surface	8 mm
Angle of admittance (to surface of sample holder at centre)	110o
Max sample thickness	4 mm
Max sample diameter	20 mm

Windows

A wide range of window materials can be fitted to the MicrostatHe2 Rectangular Tail - see the 'Windows for optical cryostats guide' in Downloads And Links
As a standard, the tail has four optical access ports system, fitted with Spectrosil B windows
Additional or replacement windows are available via the Oxford Instruments Direct - Cryospares® on-line catalogue

Pump options

A simple GF4 oil-free vane pump is supplied for operation to 3.2 K
Lower temperatures to 2.2 K use a single-stage EPS40 rotary pump

Temperature controller

MercuryiTC intelligent cryogenic envrionment controller

Transfer tubes

Choose an LLT600 or LLT700 low loss LHe transfer tube for minimum helium consumption - less than 0.45 l/hr at 4.2 K!
An automated needle valve can be fitted to the LLT to allow automation of the helium flow regulation and optimisation of the helium consumption

Software control

Oxford Instruments electronics products are controllable through the OxSoft software using RS232, ISOBUS or GPIB interfaces
LabVIEW virtual instruments are provided for Oxford Instruments electronics products to allow full PC-based control and monitoring. These can be integrated into a complete LabVIEW data acquisition system

The MicrostatHe2 Rectangular Tail 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 heat exchanger ("pull mode"). Temperature control is achieved by a combination of automatic or 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.

Microstat family continuous flow optical cryostat operating principle

The MicrostatHe2 Rectangular Tail will also operate with liquid nitrogen as coolant for measurements to 80 K.

Research Areas	Technique (optical microscopy & microscope based techniques
Magneto optical characteristics	Kerr and Faraday effect measurement

NEW Transfer tube - It plays an important part in the overall helium consumption and base temperature capability of helium cooled cryostat.

Oxford Instruments Low Loss Transfer tubes (LLT) use the cold gas exiting the cryostat to cool the shields surrounding the incoming liquid within the trasfer tube. As a result, the consumption of our cryostats is the lowest on the market, dramatically reducing your running costs.

We can also offer an extra flexible transfer tube for those with restricted space in their labs. Please note that as this does not use the gas cooled mechanism, helium consumption will be higher that for the LLT range. However it will be well suited to those who need lightweight and more flexible transfer tube.

NEW Gas flow controller - The new VC-U gas flow controller now includes the nitrogen and helium flow meters as standard.

NEW Intelligent cryogenic environment controller - Easy monitoring and control of the sample stage. The MercuryiTC controller combines several instruments into one allowing temperature control at the heat exchanger and glas flow control as well as an extra sensor channel for thermometry measurement directly at the sample stage. Everything can be accessed through touch screen front panel and remotely via Labview compatible Oxsoft IDK software.

Example MicrostatHe2: You can control the temperature with a sensor and heater at the heat exchanger, monitor and control the gas flow, AND have an extra sensor channel to measure sample temperature.

NEW Magnet power supply - Best in class stability performance and optimised for accuracy and low noise.

New Oxsoft IDK instrument development kit software - With the new Oxsoft IDK, you have new levels of control. You can design remote control and configuration programs and integrate your system into your preferred experiment control architecture.

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