Variable Temperature Insert (VTI)
The Variable Temperature Insert (or VTI) is a useful tool for studying material samples in a
magnetic field at varying temperatures. The basic VTI consists of a cylindrical tubular structure
that is inserted into the bore of a superconducting magnet. A sample is mounted onto a removable
rod placed inside the VTI. The cylindrical structure separates the sample from the surrounding liquid
helium environment. The temperature of the sample can be varied by flowing cold helium liquid or
vapor through a throttle valve or by direct heating from an integrated heater. A cryogenic
temperature controller can be supplied with the VTI.
The VTI can be separate from the magnet for installation in a bottom-loading dewar or the magnet can be
mounted onto the VTI. In this configuration, the VTI structure acts as an integrated support stand
incorporating the magnet mount, current leads, liquid level instrumentation, fill and vent ports, and
pressure relief valves.