Commissioning of the Cryogenics of the LHC Long Straight Sections

Perin, Antonio; Casas‐Cubillos, J.; Claudet, S.; Darve, Christine; Ferlin, G.; Millet, F.; Parente, C.; Rabehl, R.; Soubiran, M.; Weelderen, R. van; Wagner, U.; Weisend, J. G.

doi:10.1063/1.3422300

Cited by 1 publication

(1 citation statement)

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“…Region 3 represents the part of the rod that is located between the first thermal shield and the thermal break at the upper flange of the linear motion system. (Schaffran et al, 2014;Perin et al, 2010). If the helium level is refilled at chosen points of the measurement, e.g.…”

Section: Methodsmentioning

confidence: 99%

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,

Baader,

Casalbuoni

et al. 2024

J Synchrotron Rad

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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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Section: Methodsmentioning

confidence: 99%