PSI Center for Photon Science | PSI

A model for the fusion energy of the future: The Joint European Torus in the United Kingdom was an experimental facility for the development of tokamak-type nuclear fusion reactors. — A model for the fusion energy of the future: The Joint European Torus in the United Kingdom was an experimental facility for the development of tokamak-type nuclear fusion reactors. It was in operation from 1984 to 2023. © UKAEA, courtesy of EUROfusion

•Energy and Climate

New insights into 3D-printed materials for future fusion reactors

X-ray and neutron experiments give valuable clues.

Wanner

•Health Innovation

Not every brain ages in the same way

Over a lifetime, our brain ages – in particular its volume decreases. However, the brains of some people display a greater resistance to age-related change and to the protein deposits associated with dementia.

Tumore

•Health Innovation

Taking the fear out of cancer

Researchers at PSI are developing new technologies and drugs to eliminate tumours more effectively: with greater precision and personalised approaches

PX III focus size — Focus size at the PX III end station before and after the SLS upgrade

•Large research facilities

Sharper, smaller, brighter: Improved Focusing at PX III after the SLS 2.0 Upgrade

The first experimental results from the upgraded X06DA-PX III beamline after the SLS 2.0 upgrade show measurable improvements of the focusing capabilities. Comparing the focus size before the SLS upgrade and afterwards, the benefit of the new storage ring becomes immediately evident.

The intense beams of X-ray light at the user facilities operated by the PSI Center for Photon Science shed light on the smallest structures of matter.

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Lab News & Scientific Highlights

3D Slicing

24.03.2026

•Future Technologies

•6 min

Imaging electrical switching of ultraefficient memory devices

SLS

SLS illuminates how electrical switching in layered materials works

Quantum events can unfold on attosecond timescales, making them notoriously difficult to measure. Researchers have now devised a way to measure the duration of quantum transitions without relying on an external clock.

18.02.2026

•Future Technologies

•7 min

Measuring time at the quantum level

Quantum research SLS

Physicists using the Swiss Light Source SLS have found a way to measure the time involved in quantum events and found it depends on the symmetry of the material.

A vitamin B12 chromophore within the bacterial photoreceptor CarH is activated by an intense pulse of visible laser light and following structural changes visualized in real time by serial femtosecond crystallography at the SwissFEL Cristallina endstation.

13.02.2026

•Health Innovation

•4 min

Filming a vitamin B12 photoreceptor in action

SwissFEL Biology

SwissFEL shows the molecular events that occur when a vitamin B12 photoreceptor absorbs light

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Our Facilities

Swiss X-ray Free Electron Laser (SwissFEL)

Swiss Light Source (SLS)

Cleanroom Laboratories

Open Positions

•Postdoctoral

Postdoctoral Fellow in Computational X-ray Imaging

•Postdoctoral

Postdoctoral Fellow in Ion Trap Quantum Computing

•Postdoctoral

Postdoctoral Fellow in Catalysis and PEPICO Spectroscopy

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Contact

Prof. Dr. Gabriel Aeppli

Head of Center

gabriel.aeppli@psi.ch

+41 56 310 42 32

Elizabeth Bianchi

Group Leader / Center for Photon Science Administration

elizabeth.bianchi@psi.ch

+41 56 310 43 77