title: Note: A cryogenic, ultra-high-vacuum, microwave filter which passes a narrow beam.
abstract: We report on a device which filters microwave radiation prone to heating cryogenic experiments while at the same time allowing large apertures which will not disturb a propagating beam. A method for evaporating thin films onto the inner face of a narrow tube is also described.
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
authors.forename: N
authors.initials: N
authors.lastname: Evetts
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
authors.forename: P
authors.initials: P
authors.lastname: Dosanjh
authors.affiliation: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.
authors.forename: V
authors.initials: V
authors.lastname: Zvyagintsev
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
authors.forename: W N
authors.initials: WN
authors.lastname: Hardy