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AKBP: Arbeitskreis Beschleunigerphysik

AKBP 10: Instrumentation and Beam Diagnostics II

AKBP 10.2: Talk

Wednesday, March 20, 2024, 17:30–17:45, E 020

Gobau-Line Measurements for In-Vacuum Undulators — •Paul Volz — Helmholtz-Zentrum Berlin, Berlin — Johannes Gutenberg-Universität, Mainz

The in-vacuum elliptical undulator, IVUE32, is being developed at Helmholtz-Zentrum Berlin. The 2.5 m long device with a period length of 32 mm and a minimum gap of about 7 mm is to be installed in the BESSY II storage ring. The proximity of the undulator structure to the electron beam makes the device susceptible to wakefield effects which can influence beam stability. A complete understanding of its impedance characteristics is required prior to installation and operation. To understand and measure the IVU's impedance characteristics a Goubau-Line test stand is being designed. A Goubau-line is a single wire transmission line for high frequency surface waves with a transverse electric field resembling that of a charged particle beam out to a certain radial distance. Time domain reflectometry measurements of IVUE32 taper components will be presented. Together with a capability analysis of the Goubau-Line test stand.

Keywords: In-Vacuum Undulator; Goubau-Line; Impedance; Time Domain Reflectometry; Wakefields