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Cancelled: Duke Physics Colloquium: Advances in the Current and Future X-ray Sources
Wednesday, February 26, 2020 - 3:30pm to 4:30pm
Kwang-Je Kim (University of Chicago)
** This event has been cancelled. Apologies for any inconvenience. ** "Advances in the Current and Future X-ray Sources" X-rays from synchrotron radiation (SR) and free-electron lasers (FELs) have huge impact in the recent advances in various areas of science and technology. Having gone through several generations of development, research facilities based on SR are currently at the 4th generation stage, thus referred to as 4GSRs. A 4GSR employs spontaneous radiation from undulators installed in an "ultimate storage ring", in which the phase space area of the electron beam is "diffraction limited" in the soft X-ray spectrum. In an FEL, an electron bunch can exchange energy with a radiation pulse co-propagating in an undulator, giving rise to radiation amplification. With the advance in the linac technology for bright electron beams, an X-ray FEL (XFEL) became feasible in which the spontaneous emission is self-amplified in a long undulator by a factor about a million, giving rise to intense, quasi-coherent X-ray pulse. The brightness of this "self-amplified-spontaneous emission" (SASE) is about the same as that of 4GSRs. We are about to witness the advent of XFELs driven by super-conducting RF (SCRF) linacs with a repetition rate higher by three to four orders of magnitudes than that from Cu-linacs, and proportionally higher X-ray brightness... See the website for the full abstract. Faculty host: Ying Wu Refreshments will be available before the event in room 130.