Abstract
A high energy heavy ion mubeam system has just been installed on a beam line of the 3 MV tandem electrostatic accelerator mainly for analysis of single event upset (SEU) of LSI memories in spacecraft. This system was designed for precise beam positioning at a desired muscopic area of the mucircuit, to experimentally evaluate of actual SEU sensitive area, and also to allow single ion hits for observing a transient charge pulse from an SEU. For these purposes, a fair amount of target beam current is required for beam positioning at the desired area. The system is equipped with two lens systems: one to control the target beam current in a wide range down to an extremely low current without any change of the beam optics, and the other to focus heavy ion beams within a spot size of 1 μm. The final goal is to hit a muscopic target area with a single 15 MeV nickel ion.
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