CF302 Continuous Flow Helium Stage

Cooling stages

There are many benefits of specimen cooling in the SEM:

SEM Cold stages and modules- applications

Temperature dependent studies esp. of electrical/electronic materials e.g. insulators, semiconductors and superconductors.

Enhanced imaging and spectroscopy, esp. for cathodoluminescence (CL).

Cryogenic temperatures allow radiative recombination to dominate over non-radiative processes, leading to large increases in light output, spectral lines becoming sharper and electro-optical transitions being revealed.

CF302 continuous flow liquid Helium stage

For temperatures between 6K and 300K. It includes a replacement SEM stage and door assembly with X,Y,Z axis manual micrometers. The CF302 design ensures low drift and vibration whilst minimizing liquid helium consumption.

CF302 replacement SEM door, shown with optional C1010 airlock loading system. For controllable specimen temperatures between 6 and 300K. CF302M is a helium cooled stage module, (8K to 300K), suitable for some SEMs. As the CF302M is a module, attachment and removal to revert back to using standard specimens on the SEM goniometer requires more care than the CF302. The CF302M may only be appropriate for some microscopes.

CF302M module for attaching to SEM stage, provides a controllable specimen temperature range from 8 to 300K. Both the CF 302 and the CF302M systems are supplied complete with heater, temperature sensor, flexible transfer tube storage vessel top fitting with bladder and valve, gas flow controller, gas flow pump, digital temperature controller. A radiation shield can be included depending on the intended use and configuration.

New Dual Fuel Option

In certain territories getting liquid helium can be expensive and problematic, especially some hot climates where the dewar can be less than full on delivery. Hence the "dual fuel" system has been developed as an option which allows liquid helium cold stages to be operated with either cryogen, thus making the product much more versatile. Liquid nitrogen cannot be used in the flow configuration as boiling causes severe vibration to images. The DF option is available as new, or as an add-on to existing systems and functions by forcing cold nitrogen gas through the circuit in the same manner as the successful C1002 and Alto product range.