Physics Colloquium
<p> <strong>Old Dominion University<br /> Department of Physics</strong></p> <p> </p> <p> <strong>Fall Colloquium Series</strong><br /> </p> <p> <br /> <strong>Tuesday October 29, 2013</strong></p> <p> <br /> <br /> <strong>"The Art of Producing Bright X-Rays and Its Current Revolution"</strong></p> <p> <br /> <strong>Dr. Kwang-Je Kim</strong></p> <p> <strong>ANL & University of Chicago</strong></p> <p> After the great success of the third generation x-ray facilities employing undulators in low-emittance electron storage rings, the ring-based source is currently making another advance towards approaching the diffraction limit for x-ray wavelengths, hence improving the brightness by two orders of magnitudes and higher. Drastically higher x-ray brightness became feasible recently with the success of high-gain x-ray amplifier using the SLAC linac, in which the gain is so high that the initially incoherent undulator radiation is amplified to intense, quasi-coherent radiation known as the self-amplified spontaneous emission (SASE). It is hoped that the high intensity and the short pulse length of SASE will enable single shot imaging of complex bio-molecules before destroying them. Several high-gain x-ray FEL facilities are either in operation or under construction around the world. Vigorous R&D effort is underway towards improving the power and spectrum of high-gain x-ray amplifier. A hard FEL is also possible in oscillator configuration by employing an x-ray resonator formed by Bragg reflectors such as diamond crystals. An x-ray FEL oscillator (XFELO) will produce fully coherent, high spectral purity (meV), pico-second x-ray pulses with MHz repetition rate and storage-ring-like stability, capable 29the of solving, for example, the long standing problem of high-Tc superconductivity via IXS. An XFELO can be further stabilized by referencing its output to a narrow nuclear resonance such as 57Fe to produce x-ray spectral combs, allowing x-ray quantum optical techniques for fundamental physics and improving the length/frequency standards.<br /> </p> <p> <strong>Presentation: OCNPS 200 @ 3:00 pm</strong></p> <p> <strong>Refreshments: Atrium @ 2:30 pm</strong></p> <p> <strong>More details at <a href="http://sci.odu.edu/physics/">http://sci.odu.edu/physics/</a></strong></p> <p> <strong>All are Welcome!</strong></p> <p> </p>
Posted By: Delicia Malin
Date: Mon Oct 28 12:44:38 EDT 2013