Speaker
Description
The ISIS Neutron and Muon Source, at the Rutherford Appleton Laboratory in the UK, is a pulsed neutron source whose 50 Hz rapid cycling synchrotron accelerates beams of up to 3e13 protons to 800 MeV and delivers them to one of two fixed targets. A Medium Energy Beam Transport (MEBT) will be installed in the ISIS pre-injector after the 202.5 MHz RFQ, to improve transport and injection efficiency, and the MEBT is currently on a test stand. Four button Beam Position Monitors (BPMs) have been installed on the test stand and will be used to optimise transverse position and set-up a series of bunching cavities. Signals from the four pickups on each BPM are mixed to an intermediate frequency (IF) of 10.125 MHz, IQ sampled and processed on an FPGA to measure beam position and phase at each BPM location. In this paper, the physical and electrical characteristics of the BPM system will be summarised, with a detailed description of the front-end electronics.
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