Beam transport system for the new IUCF polarized ion source

Abstract

A high-transmission beam transport system has been designed to couple the new High Intensity Polarized Ion Source (HIPIOS) to the injector cyclotron. Longitudinally, a two stage bunching system will compress 70% of the DC beam into a phase width of ± 3° with an energy spread of less than 3 keV, at a beam energy of 620 keV. A wide band hardware phase feedback system will lock the RF systems to the beam, and there will be diagnostics to measure the beam phase width. Transversely, large aperture quadrupole and dipole magnets will maximize beam transmission; with diagnostics for measuring the source emittance, the beam polarization, and the cyclotron acceptance. The beam position will be monitored using a non-intercepting system and automated error correction will be available. The control system will feature software control “combos” which will provide single knob control for a variety of beam focussing properties. The current status of the beam transport system is discussed.