Secondary Emission Detector System for Saturne II

We present a novel approach to beam profile monitoring around a 3-GeV accelerator (Saturne) based on a break-through in secondary emission hardware. Emphasis was set on minimizing multiple scattering so as to preserve the high quality emittance required for nuclear spectroscopy. The secondary emission material is plated by a photographic process as a grid of 0.1 to 0.3 micron thick aluminium or nickel on a Kapton substrate 7 to 10 micron thick. This method represents an order of magnitude improvement over detectors using solid strips of aluminium as far as beam disturbance is concerned.