Project for development of a downsized AMS system based on the surface stripper technique

Abstract

The surface stripper technique based on ion–surface interactions, which was proposed as a gas-free stripper, has been considered to be suitable for the stripper technique in the AMS system with ion energies far below 100 keV. The aim of the project is to demonstrate experimentally the advantage of this technique. The surface stripper enables the system to be downsized; the footprint of the developed system is currently of 1.9 m × 1.9 m. We present the design concept and the configuration of the system, the present status of the construction, and the results of theoretical studies on performance of the surface stripper. About the capability of isobar molecule dissociation, we show that the numerically obtained survival probability of 13CH with 25 keV falls to below 10−12 which meets the demand level. In addition, we show that the numerically obtained yield for charge exchange of carbon ions from 1– to 1+ by the surface stripper is approximately 10%–20% which is acceptable for practical use. We also present the plan for proof-of-principle experiments.