Development of cryogenic permanent undulators operating around liquid nitrogen temperature

Details Development of cryogenic permanent undulators operating around liquid nitrogen temperature Development of cryogenic permanent undulators operating around liquid nitrogen temperature

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006njph....8..287t&link_type=abstract

New Journal of Physics, Volume 8, Issue 11, pp. 287 (2006).

Physics

3

Scientific paper

The cryogenic permanent magnet undulator (CPMU) is an insertion device in which permanent magnets (PMs) are cooled to a cryogenic temperature to improve magnetic performances in terms of remanence and coercivity. Operation of CPMUs is expected to be much easier than that of existing superconductive undulators (SCUs) with low-temperature superconducting coils, since the operating temperature can be much higher than that of liquid helium. In addition to pure PMs, high-permeability pole pieces and/or high-temperature superconductors (HTSCs) can be exploited to enhance the magnetic field of the CPMU. Towards realization of this concept, a number of R&Ds are in progress at SPring-8: field measurement under a cryogenic environment and reinforcement of HTSC samples. Encouraging results have been obtained from preliminary studies.

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