title: Fine-structure characteristics in the emittance images of a strongly focusing He+ beam.
abstract: The phase space distribution of a strongly focused He(+) ion beam source equipped with concave multiaperture electrodes was measured using a pepper-pot plate and a Kapton foil. The substructure of 301 merging He beamlets was clearly observed on a footprint of pepper-pot hole at the beam waist, where the beam density was 500 mA/cm(2). The position and the width of each beamlet substructure show the effect of interference of beamlets with surrounding one.
authors.affiliation: Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Sasao
authors.forename: T
authors.initials: T
authors.lastname: Kobuchi
authors.forename: M
authors.initials: M
authors.lastname: Kisaki
authors.forename: H
authors.initials: H
authors.lastname: Takahashi
authors.forename: A
authors.initials: A
authors.lastname: Okamoto
authors.forename: S
authors.initials: S
authors.lastname: Kitajima
authors.forename: O
authors.initials: O
authors.lastname: Kaneko
authors.forename: K
authors.initials: K
authors.lastname: Tsumori
authors.forename: K
authors.initials: K
authors.lastname: Shinto
authors.forename: M
authors.initials: M
authors.lastname: Wada