Abstract
A cryocooler based variable temperature inserts (VTI) has been designed and developed for measurement of physical properties at low temperature and high magnetic field. The VTI, designed using the helium exchange gas principle, needs to be integrated in the warm bore of an existing 6 T cryogen free magnet system. The lowest temperature achieved at the sample is 5 K at 34.5 kPa (∼5 psi) gaseous helium environment in the sample space. The equilibrium temperature of the sample, at the vacuum condition, is 8.7 K. The cool-down time of the sample at vacuum environment is 9 hrs whereas it takes 7 hrs in presence of helium exchange gas. The temperature of the sample was varied up to 325 K. The stability of the temperature achieved is less than 50 mK. The cooling and heating curves has been studied to estimate time required for a complete cycle of experiment. This paper will briefly present the design and performance of VTI system in temperature range of 5-325 K.
Highlights
A variable temperature insert (VTI) has been designed and developed for the temperature range of 5 K to 325 K for measurement of physical properties at the low temperature and high magnetic field
The lowest temperature achieved at the sample is 5 K at 5 psi gaseous helium (GHe) environment in the sample space
The cooldown characteristics with heating and cooling cycles are studied with different sample space conditions like vacuum,5 psi static GHe environment
Summary
A variable temperature insert (VTI) has been designed and developed for the temperature range of 5 K to 325 K for measurement of physical properties at the low temperature and high magnetic field. The cryocooler based VTI has been designed using the helium exchange gas principle. The lowest temperature achieved at the sample is 5 K at 5 psi gaseous helium (GHe) environment in the sample space. The equilibrium sample temperature at the vacuum condition is 8.7 K. The cooldown characteristics with heating and cooling cycles are studied with different sample space conditions like vacuum ,5 psi static GHe environment. 1st stage of CCR is anchored with radiation shield & warm SS bore and 2nd stage is thermally coupled to cold copper bore. Silicon diode temperature sensors fitted over thermal shield (T1), 2nd stage GM cryocooler (T2), warm SS (T3) & cold Cu (T4) bore thermal anchoring. The sample holder contains heater (25W) for heating and Cernox sensor (T6) for temperature measurement in VTVF
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