Dortmund 2021 – wissenschaftliches Programm
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AKBP: Arbeitskreis Beschleunigerphysik
AKBP 5: Radiofrequency and Miscellaneous
AKBP 5.4: Vortrag
Dienstag, 16. März 2021, 17:15–17:30, AKBPb
Goubau-Line Set Up for Measureing Impedance of Vacuum Chamber Components — •Paul Volz1 and Atoosa Meseck1,2 — 1Helmholtz-Zentrum Berlin — 2Johannes Gutenberg Universität Mainz
Currently, the worldwide first in-vacuum elliptical undulator, IVUE32, is being developed at Helmholtz Zentrum Berlin. The 2.5 m long insertion device with a period length of 3.2 cm and a minimum gap of about 7 mm is to be installed in the BESSY II storage ring. It will deliver radiation in the soft X-ray range for several beam lines. The proximity of the undulator structure to the particle beam makes the device susceptible to wake field effects which can in turn influence beam stability. Therefore, such a device requires a complete understanding of its impedance characteristics prior to installation and operations, as unforeseen heating of components could have catastrophic consequences. Since the complex structure of the device makes numerical calculations, such as CST simulations, at high frequency very resource intensive, bench testing the device may proof invaluable. A Goubau line is a single wire transmission line for high frequency surface waves. The transverse electric field of a Goubau line resembles that of a charged particle beam out to a certain radial distance. This can be used to mimic a particle beam and measure the impedance of vacuum chamber components outside of the accelerator. This presentation will characterize and discuss such a testing set up optimized for bench testing IVUE32-components.