Coupling impedance of an in-vacuum undulator: Measurement, simulation, and analytical estimation

Autor: Victor Smaluk, Richard Fielder, Alexei Blednykh, Guenther Rehm, Riccardo Bartolini
Jazyk: angličtina
Rok vydání: 2014
Předmět:
Zdroj: Physical Review Special Topics. Accelerators and Beams, Vol 17, Iss 7, p 074402 (2014)
Druh dokumentu: article
ISSN: 1098-4402
DOI: 10.1103/PhysRevSTAB.17.074402
Popis: One of the important issues of the in-vacuum undulator design is the coupling impedance of the vacuum chamber, which includes tapered transitions with variable gap size. To get complete and reliable information on the impedance, analytical estimate, numerical simulations and beam-based measurements have been performed at Diamond Light Source, a forthcoming upgrade of which includes introducing additional insertion device (ID) straights. The impedance of an already existing ID vessel geometrically similar to the new one has been measured using the orbit bump method. The measurement results in comparison with analytical estimations and numerical simulations are discussed in this paper.
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