Journal Article

PUBDB-2024-01998

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Novel correction procedure for compensating thermal contraction errors in the measurement of the magnetic field of superconducting undulator coils in a liquid helium cryostat

Marchetti, B. (Corresponding author)Extern* ; Baader, J. ; Casalbuoni, S. ; Yakopov, G. ; Yakopov, M.

2024
Wiley-Blackwell [Erscheinungsort nicht ermittelbar]

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Please use a persistent id in citations: doi:10.1107/S1600577524000808  doi:10.3204/PUBDB-2024-01998

Abstract: Superconducting undulators (SCUs) can offer a much higher on-axis undulator field than state-of-the-art cryogenic permanent-magnet undulators with the same period and vacuum gap. The development of shorter-period and high-field SCUs would allow the free-electron laser and synchrotron radiation source community to reduce both the length of undulators and the dimensions of the accelerator. Magnetic measurements are essential for characterizing the magnetic field quality of undulators for operation in a modern light source. Hall probe scanning is so far the most mature technique for local field characterization of undulators. This article focuses on the systematic error caused by thermal contraction that influences Hall probe measurements carried out in a liquid helium cryostat. A novel procedure, based on the redundant measurement of the magnetic field using multiple Hall probes at known relative distance, is introduced for the correction of such systematic error.

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Contributing Institute(s):

1. Undulator Systems (XFEL_DO_ID_UND)

Research Program(s):

1. 6G13 - Accelerator of European XFEL (POF4-6G13) (POF4-6G13)

Experiment(s):

1. Facility (machine) XFEL

Appears in the scientific report 2024

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