[Seminars] Accelerator Science Seminar Today!

[Holly Jaffey]

ACCELERATOR SCIENCE SEMINAR TODAY

Monday May 21, 2018
PRC 201
4:15pm

Speaker: Robert Hettel (ANL)

Title:  4th Generation Storage Ring Light Sources – Performance Goals and Challenges

Abstract: Since the first observation of visible light from a General Electric electron synchrotron in 1947, electron accelerators have been used to generate electromagnetic radiation for research  over a wide spectrum, from terahertz to gamma rays.  In the late 1960s and 1970s researchers began to parasitically tap keV-scale X-ray synchrotron radiation being generated by high energy electron-positron colliders – the 1st generation of storage ring light sources that had orders-of-magnitude higher flux and brightness compared with conventional X-ray tube generators. These sources were followed by 2nd and 3rd generation sources dedicated to X-ray production, each generation having successively lower transverse electron emittance and higher photon brightness. Now, due to breakthroughs in vacuum technology and lattice design, a 4th generation of much lower emittance storage ring light sources is emerging.  Emittances are approaching the diffraction limit for high energy X-rays, resulting in two to three orders of magnitude higher X-ray brightness and coherence than their 3rd generation counterparts, enabling new capabilities in X-ray imaging, spectroscopy and materials dynamics studies.  This presentation will review the performance properties, technology developments, design challenges and potential future capabilities of 4th generation storage ring light sources, together with their place in the landscape of X-ray free electron lasers and other X-ray sources in the world.
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