The Canadian Light Source (CLS) (French: Centre canadien de rayonnement synchrotron – CCRS) is Canada's national synchrotron light source facility, located in Saskatoon, Saskatchewan, Canada. The CLS has a third-generation 2.9 GeV storage ring, and the building occupies a footprint the size of a football field on the grounds of the University of Saskatchewan. It opened in 2004 after a 30-year campaign by the Canadian scientific community to establish a synchrotron radiation facility in Canada. It has expanded both its complement of beamlines and its building in two phases since opening, and its official visitors have included the Queen and Prince Philip. As a national synchrotron facility with over 1000 individual users, it hosts scientists from all regions of Canada and around 20 other countries.