TRIUMF’s first and largest research facility built on site, originally named the Meson Hall, has evolved to include several distinct areas. Here, the industrial appearance best reflects the idea of a working science factory. At about four stories high (and another four stories below ground), this building also plays host to the heart of TRIUMF: the laboratory’s 520 MeV cyclotron – certified by the Guinness Book of World Records as the largest accelerator of its type in the world. This machine, and the surrounding facilities, make up the core drivers of TRIUMF’s scientific programs.

Featured Facilities include Proton & Neutron Irradiation Facility (PIF/NIF), the Centre for Molecular & Quantum Materials Science (CMMS), and TRIUMF’s former Proton Therapy (PT) facility. The Ultra-cold Neutron (UCN) facility and Life Sciences’ TR-13 cyclotron are also installed here. The yellow concrete blocks, sometimes referred to as the lab’s LEGO Bricks, are used throughout the Meson Hall as radiation shielding for the beamlines and facilities connected to TRIUMF’s main cyclotron.

This infrastructure supports applications from fundamental subatomic physics and materials science, to enabling radiation testing and life sciences research – each significant examples of applied science with real-world impact.