Beam extraction from a Hall-type ion accelerator.
Fundamental characteristics of beam extraction from a Hall-type accelerator working with permanent magnets were investigated. Ions were extracted by an axial electric field E(z) in a small annular plasma channel with a radial magnetic field B(r). Effects of discharge current and voltage, length of discharge channel, and gas flow rate were examined. It can deliver a large beam current density of more than 100 mA/cm(2) with low beam energy of 50 eV. By biasing an additional plasma chamber attached at the extraction area, the beam energy was controlled independently of the beam current.
Ando
Akira
A
Department of Electrical Engineering, School of Engineering, Tohoku University, Miyagi, Japan.
Tashiro
Masashi
M
Hitomi
Keiichiro
K
Hattori
Kunihiko
K
Inutake
Masaaki
M