title: New scheme for positron accumulation in ultrahigh vacuum.
abstract: A new positron accumulation scheme compatible with ultrahigh vacuum conditions has been developed, which is realized by preparing a high density electron plasma as high as approximately 10(11) cm(-3) and an ion cloud as energy absorbers. The present accumulation rate normalized by the intensity of 22Na positron source is (3.6+/-0.3)x10(2)e(+)/s/mCi, which is more than one and a half orders of magnitude higher than other ultrahigh vacuum compatible schemes so far reported.
authors.affiliation: Institute of Physics, University of Tokyo, 3-8-1 Komaba, Meguro, Tokyo 153-8902, Japan.
authors.forename: N
authors.initials: N
authors.lastname: Oshima
authors.forename: T M
authors.initials: TM
authors.lastname: Kojima
authors.forename: M
authors.initials: M
authors.lastname: Niigaki
authors.forename: A
authors.initials: A
authors.lastname: Mohri
authors.forename: K
authors.initials: K
authors.lastname: Komaki
authors.forename: Y
authors.initials: Y
authors.lastname: Yamazaki