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SUMMARY:A step-wise tapered undulator for the quick-EXAFS beamline  at the
  Siberian Circular Photon Source
DTSTART;VALUE=DATE-TIME:20200713T131400Z
DTEND;VALUE=DATE-TIME:20200713T131500Z
DTSTAMP;VALUE=DATE-TIME:20261008T190820Z
UID:indico-contribution-1814@indico.inp.nsk.su
DESCRIPTION:Speakers: Andrei Trebushinin (Novosibirsk State University)\nS
 ynchrotron radiation (SR) provides a powerful tool for studying materials 
 with X-rays in a wide energy range. A combination of high photon flux and 
 flexibility in photon energy tunability allows exploiting SR for absorptio
 n and emission spectroscopy techniques such as XAS\, XANES\, XES. Some sop
 histicated techniques like\, for example\, quick X-ray Absorption Fine str
 ucture (qXAFS) spectroscopy allow to quickly measure the XAS spectrum. qXA
 FS is based on the use of a fast monochromator that scans through a broad 
 spectral range (1 keV) providing data acquisition in less than 100 ms. How
 ever\, modern SR sources equipped with superconducting undulators require 
 new approaches for generating radiation with such bandwidth and still reta
 in the advantage of undulator radiation compared to other broadband source
 s.\nIn this research\, we propose to use a stepwise tapered magnetic field
  configuration for the superconducting undulator: we gradually change the 
 magnetic field along the device. An undulator is effectively split into ce
 lls\, each with a slightly different magnetic field\, such that a given ha
 rmonic of the radiation emitted in each cell is shifted by half of its ban
 dwidth. The contribution from the segments sums up to a continuous spectru
 m with the desired total bandwidth of 1 keV.\nWe studied the performance o
 f this device both analytically and numerically including propagation of t
 he emitted radiation up to the sample location. We also studied how propag
 ation and spatial filtering affects radiation spectral density. This resea
 rch serves as a conceptual design for the quick-EXAFS beamline at the Sibe
 rian Circular Photon Source (SKIF ― the Russian acronym) in Novosibirsk\
 , Russia.\n\nhttps://indico.inp.nsk.su/event/24/contributions/1814/
LOCATION:
URL:https://indico.inp.nsk.su/event/24/contributions/1814/
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