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Friday, November 9, 2018 at 1:00pm to 2:00pm
"Spectrometers and their optics, as developed at CHESS"
Kenneth Finkelstein, CHESS, Cornell University
CHESS has offered capability for x-ray emission spectroscopy (XES) to users over the last 8 years. Until June 4, 2018, start of CHESS-U construction, we used about half the beamtime available at a double focused bend magnet station. In early 2019 we will commission a dedicated photon-in/photon out spectroscopy facility, fed by a Cornell compact undulator (CCU). This talk highlights existing and developing instruments for XES and RIXS at 1 eV resolution, including DAVES (the dual array valence emission spectrometer). DAVES is designed for simultaneous 2-color spectroscopy and a very recent example of the science enabled will be given. We then discuss methods of curved crystal optics fabrication and illustrate by a novel application of toroidal optics for collecting and analyzing the polarization of magnetic diffraction. This is followed by illustration of what we’ve learned from LUX/BMAD simulations of spectrometers. Lux, does Monte Carlo simulation of X-ray (coherent or incoherent) ray tracing using the Bmad subroutine library for tracking and lattice bookkeeping. BMAD is open-source software for simulating charged particles and x-rays, from source to detector.
The talk closes with an overview of CHESS-U and our plans for spectroscopy.