title: Development of a He- and He0 beam source for alpha particle measurement in a burning plasma.
abstract: Proof of principle experiments of neutral helium beam production for alpha particle diagnostics was carried out on a test stand. Negative helium ions were produced in the Li charge exchange cell, in which stable and long time operation was possible. He(-) beam was accelerated to 157 keV. Finally, He(0) beam was successfully produced after the flight in the drift-tube through the auto-electron-detachment process from He(-) to He(0). A neutral beam detector using a pyroelectric device was also developed to measure He(0) beam intensity. The metastable component in the neutral helium beam was found to be less than 2%.
authors.affiliation: Tohoku University, Aoba, Sendai 980-8579, Japan. nozomi@ecei.tohoku.ac.jp
authors.forename: N
authors.initials: N
authors.lastname: Tanaka
authors.forename: M
authors.initials: M
authors.lastname: Sasao
authors.forename: K
authors.initials: K
authors.lastname: Terai
authors.forename: A
authors.initials: A
authors.lastname: Okamoto
authors.forename: S
authors.initials: S
authors.lastname: Kitajima
authors.forename: H
authors.initials: H
authors.lastname: Yamaoka
authors.forename: M
authors.initials: M
authors.lastname: Wada