Optistat^TMAC-V Cryofree^® optical spectroscopy cryostat

OptistatTMAC-V Cryofree® optical spectroscopy cryostat

The OptistatAC-V product range includes cryostats with sample environment in vacuum using either a pulse tube (PT) or Gifford-McMahon (GM) refrigerator (GM not available for Europe).

It is designed to fit all the major spectroscopy applications, offering:

• Base temperatures down to 2.8 K without the need for cryogens
• Easy sample change
• Low running cost
• Large sample space (sample in vacuum) enabling studies of samples with a wide range of size and geometry
• An extensive range of demountable windows for current and future applications

Operation

The compressor system supplies compressed helium to the cold head through the flexible metal hoses. The gas expands in the cryostat unit to provide refrigeration, by expanding the high-pressure helium to low pressure, and then returns to the compressor unit. The cold head heat exchanger is in good thermal contact with the sample holder.

Precise temperature control is obtained using an ITC temperature controller to drive a heater located near the sample holder, sample temperature being measured using a rhodium iron temperature sensor. The optical cube, which is the lower section of the outer vacuum case, is retained by easily removable clamps to facilitate sample change.

To change the sample, the cryostat is warmed to room temperature, the vacuum released, and the clamp, optical cube and radiation shield (if applicable) removed.