title: Compact cryogenic system with mechanical cryocoolers for antihydrogen synthesis.
abstract: We have developed a compact cryogenic system which cools a vacuum chamber housing multi-ring trap electrodes (MRTs) of an antihydrogen synthesis trap using mechanical cryocoolers to achieve background pressure less than 10(-12) Torr. The vacuum chamber and the cryocoolers are thermally connected by copper strips of 99.9999% in purity. All components are installed within a diametric gap between the MRT of phi108 mm and a magnet bore of phi160 mm. An adjusting mechanism is prepared to align the MRT axis to the magnet axis. The vacuum chamber was successfully cooled down to 4.0 K after 14 h of cooling with heat load of 0.8 W.
authors.affiliation: Atomic Physics Laboratory, RIKEN, Wako 351-0198, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Shibata
authors.forename: A
authors.initials: A
authors.lastname: Mohri
authors.forename: Y
authors.initials: Y
authors.lastname: Kanai
authors.forename: Y
authors.initials: Y
authors.lastname: Enomoto
authors.forename: Y
authors.initials: Y
authors.lastname: Yamazaki