Stochastic Beam Cooling Amplifier System Front End Components Performance Characteristics

The stochastic beam cooling amplifier front end consists of 180¿ hybrids, cables, directional couplers, power dividers/combiners and low noise preamplifiers. Most front ends will be operating at near liquid nitrogen (LN) temperature. Components used in the front ends should be able to operate at this temperature satisfactorily. Since the noise performance of the front end is of utmost importance to the beam cooling process, the insertion losses of cables, 180° hybrids, directional couplers and power combiners have been measured at room temperature and near liquid nitrogen temperature. The purpose of this report is to describe and present some measurements and data on the components mentioned, with the exception of the 1-2 and 2-4 GHz preamplifiers, which have been described elsewhere. 1,2