SLS 2.0: “Dark time” during the upgrade

The Swiss Light Source SLS at PSI will shut down temporarily as part of a major upgrade project. It will come back online in 2025, ready to supply even more powerful synchrotron light than ever for innovative scientific experiments.

At 8 a.m. on the morning of Saturday 30 September, the Swiss Light Source SLS, one of PSI’s five large research facilities, will be shut down. It will remain out of operation for research purposes for over a year while the facility undergoes a comprehensive modernisation programme: the SLS 2.0 upgrade project.

The SLS is Switzerland’s only research facility using synchrotron light. It supplies highly concentrated X-ray light for scientific experiments in many fields, such as physics, materials science, chemistry, biology and medicine. Since it first came into service in 2001, some 22,500 experiments have been performed at the SLS. In addition, external researchers have visited the SLS to conduct scientific experiments around 53,000 times in these 22 years.

The purpose of the current upgrade is to make the high-calibre facility fit to address the scientific challenges of future decades. The upgrade will greatly increase the density of the X-ray light: the beam will be even brighter and collimated stronger. This will allow more samples to be examined at the SLS over the same amount of time or to get more scientific data over the same period. In many cases, performance will improve by up to a factor of 40. In addition, researchers will be able to visualise larger areas of a sample. In other experiments, the resolution of the images will be increased, so that in future it will be possible to investigate even smaller structures, for example in the nanoscale.

Research into systems for the energy transition

The upgrade will mainly affect the 288-metre-long electron storage ring. A new vacuum tube will be fitted, along with around one thousand new, complex magnets that will hold the electrons with high precision on a then improved circular path. As the electrons are accelerated to almost the speed of light they release a special type of X-ray light, or synchrotron radiation. This is used for scientific research at around twenty beam lines around the ring.

Several new beamlines will also be set up as part of the upgrade, including the future Debye beamline. Here, researchers will be able to study materials and systems, such as catalysers and batteries, that can contribute towards the energy transition, not only with extreme precision, but under realistic operating conditions.

Other experimental stations at SLS are ideal for investigating the electronic or magnetic properties of materials that could be useful for the next generation of electronic devices, or for making non-destructive 3D recordings with a resolution of just a few nanometres. Yet other beamlines are used to examine proteins, the building blocks of life, whose precise knowledge helps to develop new medical agents.

Read more on PSI website

Image: PSI’s most iconic building, the Swiss Light Source SLS, is perfectly round and houses an electron storage ring with a circumference of 288 metres. Within this large-scale facility, electrons are accelerated to almost the speed of light and supply intense, highly concentrated synchrotron light to around 20 experimental stations for research purposes.

Credit: Paul Scherrer Institute/Michel Jaussi Photography