Opening hours The psi forum Visitors Centre is open at the following times: Mon-Fri, Sun: 1-5 pm Admission is free. There is no need to book. Sidebar Contact Paul Scherrer InstituteVisitor Centre psi forum 5232 Villigen PSI Switzerland Telephone: +41 56 310 21 00 E-mail: psiforum@psi.ch The psi forum is closed on the following public holidays: Easter Friday/Easter 1 May Ascension Whitsun Corpus Christi 1 August 1 November
