The Department of Physics and Astronomy invites you to a colloquium presented by the OSA/SPIE featuring Dr. Lahsen Assoufid, Argonne National Lab. Dr. Assoufid will present his talk, “Expanding the Frontiers of X-ray Science: The Fourth-Generation Light Source at Argonne National Laboratory”, Tuesday, January 23, at 4:10 p.m. in Webster 17.
Meet for refreshments before the lecture at 3:45 – 4:10pm in the foyer on floor G above the lecture hall.
Title: Expanding the Frontiers of X-ray Science: The Fourth-Generation Light Source at Argonne National Laboratory
Abstract: X-ray synchrotron radiation storage-ring and free-electron-laser facilities have seen spectacular developments over the last three decades and have become indispensable research tools in a wide range of fields. Research done at such facilities, which offer x-ray beams billions of times brighter than conventional laboratory x-ray tubes, has led to major technological advances and scientific breakthroughs. In turn, this progress has spurred wide interest into building new-generation storage-ring light sources with revolutionary designs, as well as upgrading existing sources to meet the increased demand for beams with large spatial coherence as well as small probe beams with high brightness—beam qualities that are essential for exploration of new science at the nanoscale spatial resolution and pico-second time scale. For example, the Advanced Photon Source (APS) at Argonne National Laboratory, USA, is soon to be upgraded with a multi-bend achromat lattice. This upgrade is expected to improve the source’s horizontal emittance by a factor of nearly 100, thereby increasing the coherent flux by a factor of 100-1000 compared to the current APS. These new capabilities cannot be fully exploited without equal progress in beamline optics and instrumentation, which will require revolutionary advances in quality and design. This presentation will begin with a brief background on x-ray synchrotron radiation, followed by a general overview of the current APS as well the planned APS Upgrade. The remainder of the presentation will be on the optics requirements that must be met to preserve beam properties in the APS Upgrade and a review of the metrology tools and methods necessary for understanding beam coherence and wavefront preservation in x-ray optics.
