Abstract
Sensitive broad-band beam pickups are a prerequisite for improved stochastic beam cooling. The 2-4 GHz and the 4-8 GHz bands have been of particular interest for stochastic cooling applications. This report summarizes the striking results of an investigation of ridged waveguide pickups at Argonne. An upper-to-lower frequency ratio of 2·4:1 is readily obtained with a ridged waveguide as compared to 1.5:1 with a standard waveguide. Wire measurements and tests at the Argonne beam test facility indicate an approximate 20% increase in gain per unit over a stripline with comparable longitudinal spacing. Another advantage of waveguide pickups is construction simplicity. The output is easily coupled to a transmission line. Descriptions of the design, construction, and results are included in this report.
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