title: A versatile and reliably reusable ultrahigh vacuum viewport.
abstract: We present a viewport for use in ultrahigh vacuum (UHV) based upon the preflattened solder seal design presented in earlier work [Cox et al., Rev. Sci. Instrum. 74, 3185 (2003)]. The design features significant modifications to improve long term performance. The windows have been leak tested to less than 10(-10) atm cm(3)/s. From atom number measurements in an optical dipole trap loaded from a vapor cell magneto-optical trap inside a vacuum chamber accommodating these viewports, we measure a trap lifetime of 9.5 s suggesting a pressure of around 10(-10) Torr limited by background rubidium vapor pressure. We also present a simplified design where the UHV seal is made directly to a vacuum pipe.
authors.affiliation: Department of Physics, Durham University, Durham DH1 3LE, United Kingdom. k.j.weatherill@durham.ac.uk
authors.forename: K J
authors.initials: KJ
authors.lastname: Weatherill
authors.forename: J D
authors.initials: JD
authors.lastname: Pritchard
authors.forename: P F
authors.initials: PF
authors.lastname: Griffin
authors.forename: U
authors.initials: U
authors.lastname: Dammalapati
authors.forename: C S
authors.initials: CS
authors.lastname: Adams
authors.forename: E
authors.initials: E
authors.lastname: Riis