Inductive Megahertz Beam Position Monitors for CEBAF (Continuous Electron Beam Accelerator Facility).

摘要

CEBAF is a CW five pass recirculating linac with an energy gain of 800 MeV per pass. As a result, multiple beams of different energies are present simultaneously in the straight section beamlines. In these sections, it is required that the position of each beam be measured separately. One method of accomplishing this involves modulating the beam current for a duration of less than one revolution period. With a modulated beam, position can be measured by either a multi- gigahertz pickup operating at a harmonic of the 1.5 GHz rf, or a pickup that responds to the lower modulation frequency. In this paper, the concepts of a simple inductive loop beam position monitor system based on the detection of a 1-10 MHz amplitude modulated beam are presented. 2 refs., 13 figs. (ERA citation 14:025127)