Iason Giannopoulos
Iason Giannopoulos with part of the apparatus used to carry out the experiments at the Swiss Light Source SLS. © Paul Scherrer Institute PSI/Mahir Dzambegovic

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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.