Welcome to PSI, the largest research institute for natural and engineering sciences in Switzerland.
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A bright light for Switzerland
The new Swiss Light Source is inaugurated
The Quantum Revolution: What's Next?
A century on from the birth of quantum mechanics, 2025 marks the UNESCO International Year of Quantum Science and Technology. What does the future hold? Our experts share their opinions.
X-rays reveal fossil stealth technology
PSI imaging helps to uncover the hunting strategy of a prehistoric predator.
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Current upgrade projects and research initiatives
Together with industry to innovation
Zinc detected in clogged syringes
With the help of researchers at PSI, ANAXAM has been investigating, on behalf of the pharmaceutical company MSD, whether zinc may contribute to clogging of pre-filled syringes.
ESA Centre of Excellence opens in Switzerland
The opening ceremony of the “European Space Deep-Tech Innovation Centre” ESDI brought together distinguished guests.
A superlative milestone
PSI spin-off Araris Biotech AG achieves valuation at unicorn-level!
The people at PSI
Creating circuit diagrams of the brain
Using brain circuit diagrams to understand Alzheimer's.
With pad, pencil, and algorithms
Physicist Dominik Sidler is developing fundamental theories for previously inexplicable phenomena.
Soldering on a big stage
Whoever makes it onto the podium here is one of the world's best professional talents: PSI electronics engineer Melvin Deubelbeiss won the silver medal at WorldSkills 2024.
Working at PSI
PSI on social media
🎃💡 Power off… Power on!
Vom müden Kürbis zur hellen Nacht – am PSI wird’s energiegeladen!
Begleite uns auf einer Führung durch die Energieforschung und entdecke unsere Energiespiele rund um die…
Nuclear Systems Simulation vs Condensed Matter Theory
Draw your PhD, they said. It’ll be fun, they said.
We paired researchers from totally different fields, swapped their doodles, and let the…
🔬✨ Forschen wie die Grossen – schon in der Kita Nanolino! ✨🔬
In unserer institutseigenen Kita Nanolino entdecken die Kinder spielerisch die Welt der Wissenschaft. Gemeinsam mit unseren Fachpersonen…
🏅 Head of the PSI Center for Neutron and Muon Sciences, Professor Marc Janoschek, has been elected a fellow of the American Physical Society (APS) – one of the most highly regarded honours in physics…
Accelerator Model Simulation vs Computational Physics
Draw your PhD, they said. It’ll be fun, they said.
We paired researchers from totally different fields, swapped their doodles, and let the…
#5232, the magazine of the Paul Scherrer Institute, is out! ✨
This issue is all about the art of quantum physics – A mysterious world that researchers are trying to understand so that they can use…
💥 Breaking isn’t the end! Sometimes the best way to understand a material is to push it until it breaks and then study the scars it leaves behind.
In this #SciencePic, two images — one from an…
This year’s #NobelPrize 🏆 in Physics recognises quantum mechanics on a new scale: “the discovery of macroscopic quantum mechanical tunnelling and energy quantisation in an electric circuit”⚡.
Our…
Condensed Matter Theory vs Quantum Computing
Draw your PhD, they said. It’ll be fun, they said.
We paired researchers from totally different fields, swapped their doodles, and let the guessing…
Dynamic database for the vanadium industry - Vanadium is a crucial raw material for the #energy #transition. It can be used to make vanadium redox flow batteries, which can store electricity for…
At the Swiss Light Source SLS, X-ray tomographic microscopy of a 400-million-year-old fossilised fish 🐟, no bigger than a fingernail, has shed light on our own evolutionary past.
Researchers from…
✨Tatendrang, Teamgeist ✨ – und ein ganz besonderer Gast! Mitte September reisten die Lernenden nach Visperterminen ins Wallis ⛰️, wo sie in einem grossen Lagerhaus logierten 🛏️.
Direktionsmitglied…
For our German speakers with English below: ✨ Jung, talentiert und bereit, zu glänzen! ✨ Wir sind sehr stolz auf unsere Lernenden — Dominik Geissberger, Elia-Luca Feltrin, Nicolas Stöckli, Elina…
Kleine Türen 🚪, große Einblicke…
Unser Tag der offenen Tür am 13.09.2025 war ein voller Erfolg!
Ein herzliches Dankeschön an alle Familien, Fachpersonen und Interessierten, die uns besucht,…
Another door opens, another beam shines! 🚪🔦 ✨ With the upgraded SLS now officially inaugurated and beamlines reopening for experiments, even more groups are welcoming their first X-ray light. 🚀💡
We…
Event alert for German Speakers: Öffentliche Führung Protonentherapie
📅 Mittwoch, 24. September 2025, 16:00–18:30 Uhr
🌍 Paul Scherrer Institut PSI
🔍 Die Protonentherapie ist eine hochpräzise…
🧲 Here’s something you might not realise is happening at SwissFEL: scientists are building a test source for CERN’s next big collider.
In this #SciencePic, we look up close at the 15-Tesla capture…
Concrete may seem unspectacular – but that isn’t true of the science behind it. For John Provis at PSI Paul Scherrer Institut, concrete is a fascinating high-tech material full of secrets waiting to…
Auf der Suche nach deiner Traumlehre? 🎯
Besuch uns 2.–7. September an der Berufsschau in Wettingen an Stand 304 in Halle 3!
Entdecke 17 spannende Lehrberufe am PSI – von Physiklaborant*in,…
Merlin-7: Rethinking computing
Cutting-edge research at PSI Paul Scherrer Institute is based, among other things, on powerful computing systems. With the innovative Merlin-7 high-performance…
ようこそ、PSIへ！ — Herzlich willkommen am PSI! 🇯🇵✨🇨🇭
Am 14. August empfing das PSI iLab 15 Jugendliche aus Japan 🇯🇵🌸, die gemeinsam das PSI und das Zwischenlager Zwilag besuchten.
Die Reise wurde von…
We’ve cut the ribbon! 🎉The Swiss Light Source SLS is officially inaugurated!
Yesterday, Thursday 21 August, PSI welcomed around 150 guests from politics, business and science to celebrate the…
📅 -1 day to the inauguration of the upgrade of the SLS
Up to 1000x greater brilliance – the X-ray light from SLS is brighter, more focused, and better collimated than ever before. This leap in…
📅 -2 days to the inauguration of the upgrade of the SLS
40x lower electron emittance — that’s the result of redesigning the SLS storage ring with more, smaller magnets and innovative undulators.
…
📅 -3 days to the inauguration of the upgrade of the SLS
🌞 33% less electricity consumption — thanks to SLS 2.0!
The upgrade doesn’t just bring an enormous increased performance — it also brings…
PSI in numbers
2300
Employees at PSI are working on the world of tomorrow.
5
PSI operates five particle accelerator-based large research facilities.
64
In a total of 64 centres, labs and groups, we conduct research into pressing societal issues.
3000
Every year, around 3000 researchers from all over the world carry out experiments at our facilities.