The High Frequency Longitudinal and Transverse Pick-Ups in the CERN SPS Accelerator

The different applications and consequent specifications for longitudinal and transverse high frequency pick-ups in the CERN SPS have led to the use of three separate types of pick-up; they are the electrostatic, the wall current and the directional coupler pick-up. The high frequency longitudinal pick-ups are protected from propagating waveguide modes by traps. Certain points in the design are described and a brief summary of their performance and use is given.