Compact HTS cryogen-free magnet for magneto-optics research setup

Y. Wolfus, A. Friedman, F. Kopansky, Y. Yeshurun, Z. Bar-Haim, Z. Ron, N. Pundak

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Small working distances between the objective lenses and the inspected samples in magneto-optical (MO) setups limit the volume available for external magnetic field generation coils. Air or water-cooled copper coils are commonly used for field generation, however these coils usually make it possible to attain limited fields of the order of 10-50 mT, in continuous operating mode. HTS coils offer a unique and cost effective solution in such cases of limited space. A compact, 0.4 T, cryogen-free, HTS magnet has been designed, built and tested in a MO setup. The magnet is made of 3, 100 turns single pancakes, mounted on the second stage of a two-stage cryocooler. The HTS coil operates at about T = 45 K and generates 0.4 T in a warm bore of 30 mm diameter. Minimization of metal components in the coil makes it possible to attain field ramp rates of 7.4 T/sec with a coil charging voltage of 20 V. Initial cool-down time of the magnet takes less than 5 hours. The magnet design and performances are described in detail and serve as an example for solutions that HTS technology may offer in limited space applications.

Original languageEnglish
Pages (from-to)2320-2323
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Issue number2 PART II
StatePublished - Jun 2005

Bibliographical note

Funding Information:
Manuscript received October 5, 2004. This work was supported by the Israeli Ministry of Industry and Commerce under funds. Y. Wolfus, A. Friedman, F. Kopansky, and Y. Yeshurun are with the Department of Physics, Institute of Superconductivity, Bar-Ilan University, Ramat-Gan 52900, Israel (e-mail: Z. Bar-Haim, Z. Ron, and N. Pundak are with RICOR-Cryogenic&Vacuum Systems, En Harod Ihud 18960, Israel (e-mail: Digital Object Identifier 10.1109/TASC.2005.849642 Fig. 1. Typical MO setup including a sample cryostat (1), cold pillar with optical window (2) and polarized microscope with objective wheel (3).


  • BSCCO tape
  • Cryogen-free magnet
  • HTS coil
  • Magneto-optical setup


Dive into the research topics of 'Compact HTS cryogen-free magnet for magneto-optics research setup'. Together they form a unique fingerprint.

Cite this