Advanced

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

Hunter Dunn, Jonathan LU ; Hahlin, A; Karis, O; Arvanitis, Dimitri LU ; LeBlanc, Gregory LU ; Andersson, Åke LU and Lindgren, Lars-Johan LU (2004) Eighth International Conference on Synchrotron Radiation Instrumentation In AIP Conference Proceedings 705. p.65-68
Abstract
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... (More)
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 (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
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
in
AIP Conference Proceedings
volume
705
pages
65 - 68
publisher
American Institute of Physics
conference name
Eighth International Conference on Synchrotron Radiation Instrumentation
external identifiers
  • wos:000222089000015
  • scopus:57049109276
ISSN
1551-7616
0094-243X
DOI
10.1063/1.1757735
language
English
LU publication?
yes
id
f49e0e1b-8490-4d55-93df-eedd0f434778 (old id 614853)
date added to LUP
2007-11-26 19:46:07
date last changed
2017-11-19 03:40:22
@inproceedings{f49e0e1b-8490-4d55-93df-eedd0f434778,
  abstract     = {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&lt;sub&gt;c&lt;/sub&gt;, 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&lt;sub&gt;c&lt;/sub&gt; was characterised using X-ray magnetic circular dichroism measurements. In such experiments magnetic contrast scales directly proportional to P&lt;sub&gt;c&lt;/sub&gt;. Using a 25 atomic layer bcc Fe film deposited on the Cu(100) surface as a calibration standard the spin moment, m&lt;sub&gt;s&lt;/sub&gt;, was determined. By comparing the values of m&lt;sub&gt;s&lt;/sub&gt; obtained here with those reported earlier, the degree of circular polarisation could be estimated. At ~715 eV the calculated and measured values of P&lt;sub&gt;c&lt;/sub&gt; are 0.93 and 0.85, respectively},
  author       = {Hunter Dunn, Jonathan and Hahlin, A and Karis, O and Arvanitis, Dimitri and LeBlanc, Gregory and Andersson, Åke and Lindgren, Lars-Johan},
  booktitle    = {AIP Conference Proceedings},
  issn         = {1551-7616},
  keyword      = {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},
  language     = {eng},
  pages        = {65--68},
  publisher    = {American Institute of Physics},
  title        = {Elliptically polarised soft X-rays produced using a local bump in MAX II characterisation of the degree of polarisation},
  url          = {http://dx.doi.org/10.1063/1.1757735},
  volume       = {705},
  year         = {2004},
}