Abstract
In this paper we present the progress of the HigherOrder-Mode (HOM) coupler design for the high beta CERN SPL (Superconducting Proton Linac) cavities. This includes the RF transmission behavior as well as mechanical and thermal requirements and their optimizations. Warm RF measurements are presented for the orst four high beta SPL Cavities made of bulk niobium. Moreover theorst prototype of a HOM coupler will be introduced and we discuss its characteristics and its tuning possibilities.
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