Abstract
The Continuous Electron Beam Accelerator Facility (CEBAF), presently under construction, consists of a pair of .4 GeV recirculating linacs and will produce a 4 GeV CW beam with average currents of up to 200 μA. Because the accelerator is recirculating, multiple beams of different energies are present simultaneously in the linac beamlines. In these sections, it is required that the position of each different energy beam be measured separately. To achieve this, the electron beam itself must be modulated in time in such a way that each different energy beam in the linacs induces signals on the beam position monitors (BPMs) that can be separated using correlation techniques.In this paper, two types of correlation receiving systems used at CEBAF for the linac BPMs are described in detail. These receivers are based on the pulsed and bi‐phase pseudorandom modulated carrier methods for modulating the electron beam. In addition, the BPM receivers for the CEBAF arc regions, where the different energy beams are phys...
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