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Fundamental power couplers (FPC's) for superconducting cavities must meet very strict requirements to be able to perform at high power levels (hundreds of kilowatts) and in a variety of conditions (CW, pulsed, travelling wave, standing wave) without adversely affecting the performance of the cavities they are powering. Producing good coupler designs and achieving operational performances in accelerator environments are challenging tasks that have involved over the years large resources from many laboratories. The designs involve state-of-the-art activities in RF, cryogenic and mechanical engineering, materials science, vacuum technology, and electromagnetic field modeling. Handling, assembly and conditioning procedures have been developed to achieve ever-increasing power levels and more reliable operation. In this paper, the technical issues associated with the design, construction, assembly, processing and operation of FPC's will be reviewed, together with the progress in FPC activities in several Laboratories during the past few years.

Supported by US DOE Contracts No. DE-AC05-00OR22725 and DE-AC05-84ER40150

Author: Isidoro Campisi

2001 SRF Workshop, KEK, Tsukuba City, Japan, September 6-11, 2001

Updated September 5, 2001

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