Nara Institute of Science and Technology

Fumihiko Matsui

Hiroyuki Matsuda

Provided is a compact device which captures, over a large solid angle range, electrically charged particles emitted from a point source and parallelizes the trajectories of said charged particles. The present invention is configured from: an electrostatic lens comprising a plurality of axisymmetric electrodes (-) and an axisymmetric aspherical mesh () which has a surface that is concave away from the point source; and a flat collimator plate () positioned coaxially with the electrostatic lens. The acceptance angle for the electrically charged particles generated from a point source () is &#xb1;30&#xb0; or greater. The shape of the aspherical mesh (), and the potentials and the positions of a ground electrode () and application electrodes (-) are adjusted so that the trajectories of the electrically charged particles are substantially parallelized by the electrostatic lens. The electrostatic lens and the flat collimator plate are positioned on a common axis.

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Nara, Japan

Fumihiko Matsui