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CLASSE Seminar - Kenneth Finkelstein

Friday, November 9, 2018 at 1:00pm to 2:00pm

Wilson Synchrotron Lab, Wilson Commons

"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.

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Nahla Minges

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Kenneth Finkelstein

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CHESS, Cornell University

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