Welcome to PSI, the largest research institute for natural and engineering sciences in Switzerland.
Recent highlights from our research
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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.
Peering into matter with ultrashort X-ray ripples
An all-X-ray transient grating experiment allows scientists to study the dynamics of quantum particles at the nanoscale.
Attorney for cutting-edge technology
Former PSI doctoral candidate Stephanie Smit now works as a patent attorney for a company that is among the most important in the world. That’s because this company builds machines that are worth a fortune and are highly sought after.
Topic cloud
Current upgrade projects and research initiatives
Together with industry to innovation
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!
ESA comes to Switzerland
The signing of a contract between the European Space Agency ESA and PSI marks the start of the European Space Deep-Tech Innovation Centre ESDI.
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
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…
📅 -4 days to the inauguration of the upgrade of the SLS
🧲 1,000+ high-precision magnet systems for a brighter beam!
The upgraded Swiss Light Source features a new, innovative magnet…
📅 -5 days to the inauguration of the upgrade of the SLS
500 vacuum chambers - that’s what it takes to keep electrons circulating in the upgraded 288-meter-long Swiss Light Source ring.
Each…
📅 -6 days to the inauguration of the upgrade of the SLS
4,000 tonnes of concrete — that’s what had to be removed to access the SLS storage ring for the SLS 2.0 upgrade.
This major modernization…
Tag der offenen Tür in der Kita Nanolino
Am 13.09.2025 öffnen wir unsere Türen für alle interessierten Familien, Fachpersonen und alle, die unsere Kita einmal näher kennenlernen möchten!
Zwischen…
🚀 Ready, Set, Go! – Der Startschuss für unsere neuen Lernenden & Praktikant*innen 🎉
Am 4. August war es soweit: 24 motivierte Jugendliche haben ihre Reise am PSI begonnen! 💥
Wir freuen uns…
🐬 Silently roaming the deep sea – 183 million years ago. An exceptionally well-preserved #fossil of an #ichthyosaur sheds light on the hunting strategy of this prehistoric marine predator. High…
The quantum revolution is just beginning. ✨ In 2025 — the UNESCO @International Year of Quantum Science & Technology and a century after the first quantum breakthroughs — we are entering a new era…
Rare disease, new insights:
A recent study at the Paul Scherrer Institute PSI reveals how genetic mutations can alter the fine internal structure of tiny cell projections known as cilia. This makes…
The quantum revolution is just beginning. As 2025, the UNESCO @International Year of Quantum Science and Technology, marks a century of breakthroughs, we asked our expert Cornelius Hempel, Group Head…
💡 Zinc detected in clogged pre-filled syringes
Employees of the technology transfer centre ANAXAM and researchers at the Paul Scherrer Institute PSI have been able to show, using the unique…
🇨🇭 Happy B-day, Switzerland! 🎂🎈 Alles Gueti zum Geburi, Schwiiz! 🎉🇨🇭
Sunrise over #VilligenValley – not a bad way to start August 1st, right? 🌄✨ How are you celebrating today — grill, hike, or beam…
The quantum revolution is just beginning. ✨ In 2025 — the UNESCO @International Year of Quantum Science & Technology and a century after the first quantum breakthroughs — we are entering a new era…
The quantum revolution is just beginning. ✨ In 2025 — the UNESCO @International Year of Quantum Science and Technology and a century after the first quantum breakthroughs — we are entering a new era…
🇨🇭 Welcome to PSI (1/3) 🇨🇭
🔬 Who we are
We’re the Paul Scherrer Institute PSI, Switzerland’s largest research center for natural and engineering sciences. As part of the prestigious ETH Domain, we…
🇨🇭 Welcome to PSI (2/3) 🇨🇭
🧪 Experience research live
At PSI, science isn’t hidden behind closed doors — we open them for you:
👀 Explore the interactive exhibits at the PSI Visitor Centre and…
🇨🇭 Welcome to PSI (3/3) 🇨🇭
⚙️ Where cutting-edge science happens!
PSI builds and operates Switzerland’s most advanced large research facilities, including:
🔹 SLS - Swiss Light Source
🔹 SwissFEL …
Insights into the work of the ‘power plants’ of organic cells
New video from the series of #interviews with users of the @europeanxfel (for more videos check link in Bio)
The team led by Camila…
The quantum revolution is just beginning. ✨ In 2025 — the UNESCO International Year of Quantum Science and Technology and a century after the first quantum breakthroughs — we are entering a new era…
How does one measure radioactivity from the air?
🚁 With a high-tech detector, a Super Puma helicopter, and a clever algorithm.
In the latest #AdvancedComputing video, David Breitenmoser explains…
The quantum revolution is just beginning. ✨ In 2025 — the UNESCO International Year of Quantum Science and Technology and a century after the first quantum breakthroughs — we are entering a new era…
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.