TY - JOUR
T1 - The intermediate energy X-ray beamline at the APS
AU - McChesney, J. L.
AU - Reininger, R.
AU - Ramanathan, M.
AU - Benson, C.
AU - Srajer, G.
AU - Abbamonte, Peter Michael
AU - Campuzano, J. C.
PY - 2014/5/11
Y1 - 2014/5/11
N2 - The optical design of the Intermediate Energy X-ray (IEX) beamline at the APS has been optimized to study emergent phenomena via angle-resolved photoemission spectroscopy (ARPES) and resonant soft X-ray scattering (RSXS). Driven by the scientific requirements of these two techniques the beamline consists of two separate branchlines sharing the same source, heat absorbing optics and monochromator, but each having its own refocusing optics. The ARPES branch is optimized for a very high "resolving power" and a small spot at the sample; whereas, the RSXS branch is designed for high flux and a low beam divergence at the sample. The very high "resolving power" in the ARPES branch is achieved by using a monochromator which consists of a plane mirror and a variable line spacing grating that focuses the beam at all photon energies. A flux higher than 1010 photons/s at a "resolving power" better than 5×104 will be available at the sample position of the ARPES beamline on a spot size (FWHM) smaller than 21×4μm2 (hor.×ver.) for photon energies between 250 and 1660 eV. A second grating will increase the flux by more than a factor of 10 at a "resolving power" of 104. The flux expected at the RSXS branch for energies between 250 eV and 1900 eV is higher than 4×1012 photons/s at "resolving power" around 2.5×103. The expected spot in this branch is sub-millimeter and the beam divergence is less than 0.3 mrad (FWHM).
AB - The optical design of the Intermediate Energy X-ray (IEX) beamline at the APS has been optimized to study emergent phenomena via angle-resolved photoemission spectroscopy (ARPES) and resonant soft X-ray scattering (RSXS). Driven by the scientific requirements of these two techniques the beamline consists of two separate branchlines sharing the same source, heat absorbing optics and monochromator, but each having its own refocusing optics. The ARPES branch is optimized for a very high "resolving power" and a small spot at the sample; whereas, the RSXS branch is designed for high flux and a low beam divergence at the sample. The very high "resolving power" in the ARPES branch is achieved by using a monochromator which consists of a plane mirror and a variable line spacing grating that focuses the beam at all photon energies. A flux higher than 1010 photons/s at a "resolving power" better than 5×104 will be available at the sample position of the ARPES beamline on a spot size (FWHM) smaller than 21×4μm2 (hor.×ver.) for photon energies between 250 and 1660 eV. A second grating will increase the flux by more than a factor of 10 at a "resolving power" of 104. The flux expected at the RSXS branch for energies between 250 eV and 1900 eV is higher than 4×1012 photons/s at "resolving power" around 2.5×103. The expected spot in this branch is sub-millimeter and the beam divergence is less than 0.3 mrad (FWHM).
KW - Beamline
KW - Electromagnetic quasiperiodic undulator
KW - Soft X-ray
KW - VLS-PGM
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U2 - 10.1016/j.nima.2014.01.068
DO - 10.1016/j.nima.2014.01.068
M3 - Article
AN - SCOPUS:84897678145
VL - 746
SP - 98
EP - 105
JO - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
JF - Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
SN - 0168-9002
ER -