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X-RAY RUNS: Apply for Beamtime

2017  May 17 - June 29

2017  October 11 - December 21
2017  Proposal deadline: 08/01/17
2017  BTR deadline: 09/10/17

 A1      A2      B1      C1      D1      F1      F2      F3      G1      G2      G3    

 

Bend magnet line with wide range of capabilities

C1 Station Summary
Monochromator: Silicon 111 & 220 (sagittal) + 311, 400 crystals WB4C multilayers
Energy Range: 3-30 KeV
Energy resolution: 100 > E / ΔE > 10000
Flux: up to 2x1013 photons/sec/mm2
X-ray mirrors: white beam, adjustable vertical focus (rhodium) post monochrometer, flat (rhodium)
Cryosts: 10K and 4K models with beryllium vacuum shrouds
Polarimeter: Linear at energy from 5 to 15KeV
Detectors: Ion chambers, pin-diodes, NaI, SDD, APD,
1D - Mythen, 2D - Andor CMOS, Pilatus, CCD

This beamline supports x-ray optics development, spectroscopy (absorption, emission, extra-high resolution methods), resonant scattering (anomalous-SAXS, single crystal diffraction, plus a limited RIXS capability), topography with spatial resolution to a few microns, and accelerator physics during CESR-TA run periods. The large hutch accommodates a variety of instruments including unique equipment developed for this station. Because there is a single beryllium vacuum window, we can deliver high monochromatic flux from approximately 3 to 30KeV, with continuous helium flight path to the sample position. The choice of x-ray optical elements includes: vertically focusing mirror equidistant from source and sample, silicon crystal and wide bandpass multilayer monochrometers, sagittal (horizontal) focusing as well as capillary optics, and polarization measuring devices. Standard experimental capabilities include: up to 9-circle diffractometer, multi-analyzer x-ray emission spectrometers for Rowland-circle (energy scan), and dispersive (simultaneous full spectrum) data collection, several optical tables and closed cycle helium cryostats as well as a wide variety of x-ray detectors.

Angel Rodriguez-Fernandez and Ken Finkelstein
6-circle Diffractometer with polarimeter (top) shown during inaugural experiment on resonant scattering in Dec. 2013. Graduate student Angel Rodriguez-Fernandez is shown working with CHESS C1 scientist Ken Finkelstein.

Rowland circle scanning x-ray emission spectrometer
Concept drawing of Rowland circle scanning x-ray emission spectrometer. Displex cryostat (brown) holding sample, and Vortex detector (purple) and opposite 5-crystal analyzer array. Scan emission energ by moving detector at twice the rate of analyzers along the circle indicated.