Gantry 3 at the Center for Proton Therapy at PSI. With the help of this rotating treatment apparatus, cancer patients are irradiated with protons to destroy tumours.
Gantry 3 at the Center for Proton Therapy at PSI. With the help of this rotating treatment apparatus, cancer patients are irradiated with protons to destroy tumours. © Scanderbeg Sauer Photography

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Welcome to PSI, the largest research institute for natural and engineering sciences in Switzerland.

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Employees at PSI are working on the world of tomorrow.

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PSI operates five particle accelerator-based large research facilities.

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In a total of 64 centres, labs and groups, we conduct research into pressing societal issues.

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Every year, around 3000 researchers from all over the world carry out experiments at our facilities.