Setting up of a MicroKelvin refrigerator facility at TIFR

Abstract

In this note, we report the setting up of the first adiabatic nuclear demagnetization facility in India at the Tata Institute of Fundamental Research, Mumbai. We are able to cool 5 Kg of Copper down to 39 μK using this system. In addition we could maintain this temperature (39 μK) for more than 36 hours. Temperature was measured using Ruthenium oxide and Carbon (SPEER) resistance sensors in the range 4.2K-20 mK, Cerium Magnesium Nitrate (CMN) susceptibility sensors in the range 4.2 K-4 mK, and platinum (195Pt) NMR thermometry in the range 20 mK-39 μK. © 2012 American Institute of Physics.