cyclotron has been in operation for proton therapy since 2007 and provides the beam for treating tumours in cancer patients. It was the first superconducting cyclotron worldwide to be used for proton therapy. Previously, part of the proton beam from the Ring Cyclotron was split off for this purpose, but since 2007 the medical facility has been producing its own proton beam independently, which supplies several irradiation stations for therapy. Other components of the facility, the peripheral equipment and the control systems have also been improved in the meantime, so that today the facility is available over 98 percent of the time with more than 7000 operating hours per year. Swiss Light Source (SLS) The Swiss Light Source (SLS), an electron synchrotron, has been in operation since 1 August 2001. It works like a kind of combined X-ray machine and microscope to screen a wide variety of substances. In the circular structure, the electrons move on a circular path 288 m in circumference, emitting synchrotron radiation in a tangential direction. A total of 350 magnets hold the electron beam on its course and focus it. Acceleration cavities ensure that the beam's speed remains constant. Since 2008, the SLS has been the accelerator with the thinnest electron beam in the world. PSI researchers and technicians have been working on this for eight years and have repeatedly adjusted each of the many magnets. The SLS offers a very broad spectrum of synchrotron radiation from infrared light to hard X-rays. This enables researchers to take microscopic pictures inside objects, materials and tissue to, for example, improve materials or develop drugs. In 2017, a new instrument at the SLS made it possible to look inside a computer chip for the first time without destroying it. Structures such as 45 nanometre narrow power lines and 34 nanometre high transistors became visible. This technology enables chip manufacturers to, for example, check whether their products comply with the specifications more easily. Currently, under the working title "SLS 2.0", plans are being made to upgrade the SLS and thus create a fourth-generation synchrotron light source. SwissFEL The SwissFEL free-electron laser was officially opened on 5 December 2016 by the Federal Councillor Johann Schneider-Ammann. In 2018, the first beamline ARAMIS came into operation. The second beamline ATHOS is scheduled to follow in autumn 2020. Worldwide, only four comparable facilities are in operation. Training Centre The PSI Education Centre has