PROPOSED BEAM POSITION AND PHASE MEASUREMENTS FOR THE LANSCE LINAC

There is presently an ongoing effort to develop beam position and phase measurements for the Los Alamos Neutron Science Center (LANSCE) linac associated with an improvement project known as the LANSCE Refurbishment. This non-interceptive measurement's purpose is to provide both measurements of beam phase for determining RF-cavity phase and amplitude set points, and position for determining the 805-MHz linac input beam transverse position and trajectories. The measurement components consist of a four-electrode beam-position and phase monitor (BPPM), a cable plant that transports the 201.25-MHz signals, electronics capable of detecting phase and amplitude signals, and associated software that communicates with a mature LANSCE control system. This paper describes measurement requirements, proposed beam line device, initial concepts for the associated electronics, and some of the issues developing beam measurements for an operational facility.