LANL, Los Alamos, New Mexico, USA
The Los Alamos Neutron Science Center (LANSCE) Risk Mitigation Project is in the process of replacing older Coupled-Cavity-Linac Beam-Position Monitors (BPMs) that in most locations include a separate Delta-T loop with newer Beam Position and Phase Monitors (BPPMs), including their associated electronics and cable plants. Twenty-three BPPMs have thus far been installed and many have monitored the charged particle beam. The installation of these newer BPPMs is the first step to installing complete BPPM measurement systems. Prior to the installation, a characterization of each BPPM took place. The characterization procedure includes a mechanical inspection, a vacuum testing, and associated electrical tests. The BPPM electrical tests for all four electrodes include contact resistance measurements, Time Domain Reflectometer (TDR) measurements, relative 201.25-MHz phase measurements, and finally a set of position-sensitive mapping measurements were performed which included associated fitting routines. This paper will show these data for a typical characterized BPPM.
