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Design and performance of the APPLE-Knot undulator.

Authors
  • Ji, Fuhao
  • Chang, Rui
  • Zhou, Qiaogen
  • Zhang, Wei
  • Ye, Mao
  • Sasaki, Shigemi
  • Qiao, Shan
Type
Published Article
Journal
Journal of Synchrotron Radiation
Publisher
International Union of Crystallography
Publication Date
Jul 01, 2015
Volume
22
Issue
4
Pages
901–907
Identifiers
DOI: 10.1107/S1600577515006062
PMID: 26134793
Source
Medline
Keywords
License
Unknown

Abstract

Along with the development of accelerator technology, synchrotron emittance has continuously decreased. This results in increased brightness, but also causes a heavy heat load on beamline optics. Recently, optical surfaces with 0.1 nm micro-roughness and 0.05 µrad slope error (r.m.s.) have become commercially available and surface distortions due to heat load have become a key factor in determining beamline performance, and heat load has become a serious problem at modern synchrotron radiation facilities. Here, APPLE-Knot undulators which can generate photons with arbitrary polarization, with low on-axis heat load, are reported.

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