Among special Danish competences is simulation of neutron scattering, since DTU Physics in Lyngby is the home of the McStas software collaboration (formerly Risø DTU), also comprising the Niels Bohr Institute in Copenhagen Institut Laue-Langevin in Grenoble, France and Paul Scherrer Institute in Villigen, Switzerland
The Paul Scherrer Institute is primarily located in Villigen, although part is across the Aare river in Würenlingen.
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In January 2006, Villigen incorporated the former municipality of Stilli.
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This is presently achieved at few large scale facilities in the world: the CMMS continuous source at TRIUMF in Vancouver, Canada; the SµS continuous source at the Paul Scherrer Institut (PSI) in Villigen, Switzerland; the ISIS and RIKEN-RAL pulsed sources at the Rutherford Appleton Laboratory in Chilton, United Kingdom; and the J-PARC facility in Tokai, Japan, where a new pulsed source is being built to replace that at KEK in Tsukuba, Japan.