TY  - JOUR
AU  - Marchetti, Barbara
AU  - Baader, Johann
AU  - Casalbuoni, Sara
AU  - Yakopov, Grigory
AU  - Yakopov, Mikhail
TI  - Novel correction procedure for compensating thermal contraction errors in the measurement of the magnetic field of superconducting undulator coils in a liquid helium cryostat
JO  - Journal of synchrotron radiation
VL  - 31
IS  - 2
SN  - 1600-5775
CY  - [Erscheinungsort nicht ermittelbar]
PB  - Wiley-Blackwell
M1  - PUBDB-2024-01998
SP  - 282-294
PY  - 2024
AB  - 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.
LB  - PUB:(DE-HGF)16
C6  - pmid:38386564
UR  - <Go to ISI:>//WOS:001206975000010
DO  - DOI:10.1107/S1600577524000808
UR  - https://bib-pubdb1.desy.de/record/607695
ER  -