Speaker
Description
The VSR Demo project aims for the validation of a cavity design suitable for the application in electron storage rings, characterized by currents of several hundreds of mA and a dense wakefield spectrum caused by inhomogeneous fill patterns. The cavities are equipped with five waveguides plus a coaxial fundamental power coupler, forming two groups of three radial extensions at either cavity end. Recently two prototypes were manufactured and are in the process of vertical testing at HZB’s Large Vertical Test Stand. First tests completed with Prototype 1, covering all modes of the fundamental passband and different temperature levels, did not match the Q(E)-performance expectations, but indicate a yet unknown loss mechanism in the cavity’s periphery, i.e. waveguide endgroups, beam pipe extensions, blind flanges or the coupling feedthrough. Further insights are expected from the ongoing testing program with modified coupling and with Prototype 2.
Funding Agency
Work supported by the Helmholtz Association
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