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Elliptically polarised soft X-rays produced using a local bump in MAX II characterisation of the degree of polarisation

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Author

  • Jonathan Hunter Dunn
  • A Hahlin
  • O Karis
  • Dimitri Arvanitis
  • Gregory LeBlanc
  • Åke Andersson
  • Lars-Johan Lindgren

Summary, in English

MAX-lab has introduced a local perturbation to the electron orbit of the MAX II storage ring, providing users at the SX700 monochromator beam line, D1011, with elliptically polarised soft X-rays. This is achieved by using corrector magnets to send the electron orbit on an ascending or descending trajectory through the dipole magnet source. This simple "bump" approach has many advantages over and above insertion device based solutions. To illustrate the potential of the approach, the degree of circular polarisation, P<sub>c</sub>, has both been calculated and measured. The calculation was made by applying the Stokes formalism to the intensities given by the standard dipole emission formula. Experimentally P<sub>c</sub> was characterised using X-ray magnetic circular dichroism measurements. In such experiments magnetic contrast scales directly proportional to P<sub>c</sub>. Using a 25 atomic layer bcc Fe film deposited on the Cu(100) surface as a calibration standard the spin moment, m<sub>s</sub>, was determined. By comparing the values of m<sub>s</sub> obtained here with those reported earlier, the degree of circular polarisation could be estimated. At ~715 eV the calculated and measured values of P<sub>c</sub> are 0.93 and 0.85, respectively

Department/s

Publishing year

2004

Language

English

Pages

65-68

Publication/Series

AIP Conference Proceedings

Volume

705

Document type

Conference paper

Publisher

American Institute of Physics (AIP)

Topic

  • Natural Sciences
  • Physical Sciences

Keywords

  • X-ray magnetic circular dichroism measurements
  • magnetic contrast
  • atomic layer bcc Fe film
  • Cu(100) surface
  • calibration standard
  • spin moment
  • dipole emission formula
  • Stokes formalism
  • circular polarisation degree
  • insertion device based solutions
  • dipole magnet source
  • corrector magnets
  • D1011
  • SX700 monochromator beam line
  • electron orbit
  • local perturbation
  • MAX II storage ring
  • local bump
  • elliptically polarised soft X-rays
  • soft X-rays production

Conference name

Eighth International Conference on Synchrotron Radiation Instrumentation

Conference date

2003-08-25 - 2003-08-29

Conference place

San Francisco, CA, United States

Status

Published

ISBN/ISSN/Other

  • ISSN: 1551-7616
  • ISSN: 0094-243X