title: Liquid helium cryopump and reliable opening device for a balloon-borne mass spectrometer.
abstract: The design, technical characteristics, and test and flight results of a liquid helium cryopump and an opening device operating on board a balloon-borne mass spectrometer combining a cryopump and a quadrupole mass filter are reported. The gas inlet of this mass spectrometer is opened through a simple and reliable remote-controlled system, which is also described.
authors.affiliation: Belgian Institute for Space Aeronomy, Ringlaan 3, B-1180 Brussels, Belgium.Leybold-Heraeus, GmbH CO-KG, Gaedestrasse, 5 Cologne 51, West Germany.
authors.forename: J
authors.initials: J
authors.lastname: Ingels
authors.forename: E
authors.initials: E
authors.lastname: Arijs
authors.forename: D
authors.initials: D
authors.lastname: Nevejans
authors.forename: H J
authors.initials: HJ
authors.lastname: Forth
authors.forename: G
authors.initials: G
authors.lastname: Schäfer