Open AccessSpatial‐frequency features of radiation produced by a step‐wise tapered undulator
Author(s) -
Trebushinin Andrei,
Serkez Svitozar,
Veremchuk Mykola,
Rakshun Yakov,
Geloni Gianluca
Publication year - 2021
Publication title -
journal of synchrotron radiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 99
ISSN - 1600-5775
DOI - 10.1107/s1600577521001958
Subject(s) - undulator , beamline , tapering , optics , physics , radiation , bandwidth (computing) , photon , broadband , synchrotron radiation , image resolution , computer science , telecommunications , beam (structure) , computer graphics (images)
A scheme to generate wide‐bandwidth radiation using a step‐wise tapered undulator with a segmented structure is proposed. This magnetic field configuration allows to broaden the undulator harmonic spectrum by two orders of magnitude, providing 1 keV bandwidth with spectral flux density exceeding 10 16 photons s −1 mm −2 (0.1% bandwidth) −1 at 5 keV on the sample. Such a magnetic setup is applicable to superconducting devices where magnetic tapering cannot be arranged mechanically. The resulting radiation with broadband spectrum and flat‐top shape may be exploited at a multipurpose beamline for scanning over the spectrum at time scales of 10–100 ms. The radiation from a segmented undulator is described analytically and derivations with numerical simulations are verified. In addition, a start‐to‐end simulation of an optical beamline is performed and issues related to the longitudinally distributed radiation source and its image upon focusing on the sample are addressed.