Abstract
An analytical study of high-energy neutral injection into a mirror-quadrupole cusp magnetic field is described. This magnetic geometry is shown to be particularly well suited to Lorentz ionization of neutral atoms if the injection trajectory describes an oblique angle to the axis of the system and lies in a plane midway between the current carrying bars which produce the cusp field. Along such a trajectory the effective ionizing electric field v×B can vary from nearly zero to the full value vB. A relative trapping efficiency is defined as the variation in the component of magnetic field perpendicular to the injection path over which ionized particles will be contained. For the particular magnetic field studied, the trapping efficiency for the optimum trajectory is approximately 70 times that for conventional injection perpendicular to the axis. An analog computer was used to trace initial particle orbits to determine which orbits are contained. A somewhat higher trapping efficiency for oblique injection into a six-bar mirror-cusp field is also indicated.
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