Seminarium: Towards an Ångström Laser at the FREIA Laboratory

  • Datum:
  • Plats: Zoom:
  • Föreläsare: Vitaliy Goryashko
  • Kontaktperson: Annica Black-Schaffer
  • Seminarium

When in 1945 Julian Schwinger predicted high-intensity Doppler-upshifted radiation from an electron accelerated to a high energy, no one could foresee that this radiation – known today as synchrotron radiation – would be a tool that revolutionized our understanding of the microcosm of atoms, molecules, materials and matter under extreme conditions. Nowadays, there are tens of thousands of synchrotron users worldwide. Another theoretical prediction by Evgeny Saldin in 1982 led to the groundbreaking development of X-ray Free-Electron Lasers (FELs), which is the brightest man-made source of light. Based on the diffraction before destruction principle, born in Uppsala, FELs enabled e.g. characterization of the structure of biomolecules with sub-Ångström resolution paving the way to control their functions. At the FREIA Laboratory, we are working on developing compact versions of synchrotrons and FELs in order to bring the power of these unique instruments to universities – the places where they are the most needed. In this seminar, I will discuss our development of a compact femtosecond X-ray source, envisioned to provide local X-ray users with laser-like X-ray radiation. A newly synthesized sample could be tested next door, thus accelerating the material discovery cycle. In the seminar I will also touch upon science applications that would be enabled by a high repetition rate laser-like X-ray source. We foresee that such a source will be central for a new multidimensional environment for angle resolved and core-level photoemission spectroscopy from organic photocells all the way to the identification of band topology of surface states in quantum materials.