DIAGNOSTICS FOR THE LANSCE RFQ FRONT-END TEST STAND

Plans are underway at the Los Alamos Neutron Science Center (LANSCE) to replace the existing H CockcroftWalton injector with a modern 4-rod Radio-Frequency Quadrupole (RFQ) based front end. This will provide protons for injection into the downstream linac, where H ions are also accelerated. This dual-species operation of the linac imposes constraints on the injectors, resulting in particular requirements on the transverse and longitudinal emittances and phase-space distributions of the beam from the RFQ proton injector. Good measurements of these quantities are therefore required during the testing phase of the RFQ injector. In this paper we describe the measurements to be made and plans for the systems for carrying out the measurements.