RLA (Recirculating Linear Accelerator) Injection and Transport Experiments.

摘要

The Sandia National Laboratories program to produce a light weight, compact, high voltage, high-current recirculating linear accelerator (RLA) uses a low-energy electron beam (LEEB) produced ion focus regime (IFR) plasma channel to electrostatically guide an intense relativistic electron beam (REB). The near-term goal is to inject a 1. 5-MV, 10-20 kA, 25-ns FWHM beam onto this IFR channel, which is in a racetrack configuration, and to accelerate the beam pulse using a 1.0-MV repeating waveform produced by a radial, dielectric cavity located in the racetrack. In this paper, we report on our recent experiments to optimize the transport of the beam from the isolated Blumlein (IB) injector onto a straight section of the racetrack IFR channel with no additional acceleration present. Three different schemes have been tried to properly match the beam produced by the injector onto the IFR channel: an electrostatic wire zone, a low- pressure classical IFR gas cell, and a moderate-pressure gas cell. The results of these experiments plus our future experimental plans will be discussed. 8 refs., 6 figs. (ERA citation 14:001507)