title: Observation of plasma focusing of a 28.5 GeV positron beam.
abstract: The observation of plasma focusing of a 28.5 GeV positron beam is reported. The plasma was formed by ionizing a nitrogen jet only 3 mm thick. Simultaneous focusing in both transverse dimensions was observed with effective focusing strengths of order tesla per micron. The minimum area of the beam spot was reduced by a factor of 2.0+/-0.3 by the plasma. The longitudinal beam envelope was measured and compared with numerical calculations.
authors.affiliation: Stanford Linear Accelerator Center, P.O. Box 4349, Stanford, California 94309, USA.
authors.forename: J S
authors.initials: JS
authors.lastname: Ng
authors.forename: P
authors.initials: P
authors.lastname: Chen
authors.forename: H
authors.initials: H
authors.lastname: Baldis
authors.forename: P
authors.initials: P
authors.lastname: Bolton
authors.forename: D
authors.initials: D
authors.lastname: Cline
authors.forename: W
authors.initials: W
authors.lastname: Craddock
authors.forename: C
authors.initials: C
authors.lastname: Crawford
authors.forename: F J
authors.initials: FJ
authors.lastname: Decker
authors.forename: C
authors.initials: C
authors.lastname: Field
authors.forename: Y
authors.initials: Y
authors.lastname: Fukui
authors.forename: V
authors.initials: V
authors.lastname: Kumar
authors.forename: R
authors.initials: R
authors.lastname: Iverson
authors.forename: F
authors.initials: F
authors.lastname: King
authors.forename: R E
authors.initials: RE
authors.lastname: Kirby
authors.forename: K
authors.initials: K
authors.lastname: Nakajima
authors.forename: R
authors.initials: R
authors.lastname: Noble
authors.forename: A
authors.initials: A
authors.lastname: Ogata
authors.forename: P
authors.initials: P
authors.lastname: Raimondi
authors.forename: D
authors.initials: D
authors.lastname: Walz
authors.forename: A W
authors.initials: AW
authors.lastname: Weidemann