Operation of a continuous flow liquid helium magnetic microscopy cryostat as a closed cycle system

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrate successful operation of a continuous flow liquid helium magnetic cryostat (Oxford Instruments, Microstat MO) in closed cycle operation using a modular cryocooling system (ColdEdge Technologies, Stinger). For the system operation, we have developed a custom gas handling manifold and we show that despite the lower cooling power of the cryocooler with respect to the nominal cryostat cooling power requirements, the magnetic cryostat can be operated in a stable manner. We provide the design of the gas handling manifold, and a detailed analysis of the system performance in terms of cooling times, magnetic field ramping rates and vibrations at the sample. Base temperature can be reached within 10 hours while the superconducting magnet can be energized at a ramping rate of 0.5 T/min. Vibrations are measured interferometrically and show amplitudes with a root mean square on the order of 5 nm permitting the use of the system for sensitive magnetic microscopy experiments.
Original languageEnglish
Number of pages10
JournalReview of Scientific Instruments
Publication statusAccepted/In press - 12 Nov 2021

Keywords

  • liquid helium
  • cryorefridgeration system
  • magnetic microscopy

Fingerprint

Dive into the research topics of 'Operation of a continuous flow liquid helium magnetic microscopy cryostat as a closed cycle system'. Together they form a unique fingerprint.

Cite this