Fine-structure characteristics in the emittance images of a strongly focusing He+ beam.
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.
Sasao
M
M
Graduate School of Engineering, Tohoku University, Sendai, Miyagi 980-8579, Japan.
Kobuchi
T
T
Kisaki
M
M
Takahashi
H
H
Okamoto
A
A
Kitajima
S
S
Kaneko
O
O
Tsumori
K
K
Shinto
K
K
Wada
M
M