A technique for storage of fast-ion beams ͑keV͒ using only electrostatic fields is presented. The fast-ion trap is designed like an optical resonator, whose electrode configuration allows for a very large field-free region, easy access into the trap by various probes, a simple ion loading technique, and a broad acceptance range for the initial kinetic energies of the ions. Such a fast-ion storage device opens up many experimental possibilities, a few of which are presented. ͓S1050-2947͑97͒50803-1͔

11. 10. The Incidence angle is the angle between the incldent radiation and the local vertlcal (mean surface normal). Nearthe lunar poles the Incidence angle for Earth-based observations approaches 90'. An maging radar system forms a map of the sutface backscatter from range-Doppler measurements of backscatter. The projection of range-Doppler coordinates onto a surface at h~gh incidence angles IS similar to a regular grid In surface coordnates, resulting ~n a "plan vew" of the suriace backscatter.

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