ULE beamline optics

A beamline was developed specifically for production and transport of high perveance ion beams. Space charge effects are addressed at three stages of the beamline: extraction system, mass resolver and target interface. A large cross-section ion beam is extracted from a large area quiescent plasma by a fixed geometry pentode, and is injected into a 135 degree dipole magnet for mass dispersion. This magnet incorporates surface coils to produce independently adjustable quadrupole fields to accommodate variable space charge defocusing effects. The beam then passes through an adjustable width mass resolving slit that is combined with it post accel (or decel) gap, and finally traverses a plasma cell on its way to the target, for complete self regulating target neutralization. Design philosophy is presented with first order transport properties.