The synchrotron radiation source PETRA III and its future ultra-low-emittance upgrade PETRA IV

PETRA III at DESY is one of the brightest synchrotron radiation sources worldwide. It serves a broad internationalmultidisciplinary user community from academia to industry at currently 25 specialised beamlines. With a storage-ring energy of6 GeV, it provides mainly hard to high-energy X-rays for versatile experiments in a very broad range of scientific fields. It is ideallysuited for an upgrade to the ultra-low emittance source PETRA IV, owing to its large circumference of 2304 m. With a targeted storage ring emittance of 20 x 5pm(2)rad(2),PETRA IV will reach spectral brightnesses two to three orders of magnitude higher thantoday. The unique beam parameters will make PETRA IV the ultimate in situ 3D microscope for biological, chemical, and physical processes helping to address key questions in health, energy, mobility, information technology, and earth and environment.

Automated summary

PETRA III at DESY is one of the brightest synchrotron radiation sources in the world, serving a broad international user community. It is an ideal candidate for upgrading to the ultra-low emittance source PETRA IV, which will significantly increase the spectral brightness. PETRA IV will be the ultimate in situ 3D microscope for biological, chemical, and physical processes, addressing key questions in various fields.