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

Journal Article · Fri Jul 25 00:00:00 EDT 2014 · Physical Review Accelerators and Beams (Online)

DOI:https://doi.org/10.1103/PhysRevSTAB.17.074402· OSTI ID:1166720

Simaluk, Victor ^[1]; Blednykh, Alexei ^[2]; Fielder, Richard ^[1]; Rehm, Guenther ^[1]; Bartolini, Riccardo ^[3]

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1. Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.
2. Brookhaven National Lab. (BNL), Upton, NY (United States)
3. Science and Technology Facilities Council (STFC), Harwell Campus, Oxford (United Kingdom). Diamond Light Source, Ltd.; Univ. of Oxford (United Kingdom)

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. In order 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. Moreover, 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.

• Research Organization: Brookhaven National Lab. (BNL), Upton, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 1166720
• Report Number(s): BNL-106248-2014-JA; R&D Project: LS001
• Journal Information: Physical Review Accelerators and Beams (Online), Vol. 17, Issue 7; ISSN 2469-9888
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE