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In situ correction of field errors induced by temperature gradient in cryogenic undulators

Takashi Tanaka1,2,*, Takamitsu Seike2, Akihiro Kagamihata2, Thomas Schmidt3, Alexander Anghel3, Mark Brügger3, Willy Bulgheroni3, Bruno Jakob3, and Hideo Kitamura1,2

  • 1RIKEN/SPring-8, Koto 1-1-1, Mikazuki, Sayo, Hyogo 679-5148, Japan
  • 2JASRI/SPring-8, Koto 1-1-1, Mikazuki, Sayo, Hyogo 679-5198, Japan
  • 3Paul Scherrer Institute, 5232 Villigen PSI, Switzerland

  • *ztanaka@spring8.or.jp
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Phys. Rev. ST Accel. Beams 12, 120702 – Published 22 December, 2009

DOI: https://doi.org/10.1103/PhysRevSTAB.12.120702

Abstract

A new technique of undulator field correction for cryogenic permanent magnet undulators (CPMUs) is proposed to correct the phase error induced by temperature gradient. This technique takes advantage of two important instruments: one is the in-vacuum self-aligned field analyzer with laser instrumentation system to precisely measure the distribution of the magnetic field generated by the permanent magnet arrays placed in vacuum, and the other is the differential adjuster to correct the local variation of the magnet gap. The details of the two instruments are described together with the method of how to analyze the field measurement data and deduce the gap variation along the undulator axis. The correction technique was applied to the CPMU with a length of 1.7 m and a magnetic period of 14 mm. It was found that the phase error induced during the cooling process was attributable to local gap variations of around 30  μm, which were then corrected by the differential adjuster.

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References (7)

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Phys. Rev. ST Accel. Beams 12, 120702– Published 22 December, 2009
  • Received 10 September 2009
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