Neutralization of H- Beams by Magnetic Stripping

The stability of H- beams passing through strong magnetic fields has been relevant to accelerator transport problems and, recently, to neutral beam preparation techniques. We have measured the H- electron detachment rate as a function of restframe electric field and provide parameters for a theoretical lifetime expression. We discuss the limitations imposed on H- transport by magnetic stripping, and neutral-beam preparation in emittance growth, magnetic fields, and beam energies. Application techniques are also briefly discussed.