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Use of astigmatic re-focusing at HP-XPS end-station

Grizolli, Walan LU ; Hennies, Franz LU ; Knudsen, Jan LU ; Nyholm, Ralf LU ; Sankari, Rami LU and Schnadt, Joachim LU orcid (2013) 11th International Conference on Synchrotron Radiation Instrumentation (SRI) 425.
Abstract
In this paper we present the refocusing optics for the new high pressure photoelectron spectroscopy (HP-XPS) branch line at MAX-lab, based on a plane grating monochromator with vertically collimated beam. For the HP-XPS instrument, the required spot size is dictated by the small geometric acceptance of the HP-XPS electron energy analyzer. Whereas a pair of bendable mirrors in a KB configuration has some advantages as refocusing elements, we have studied whether similar performance can be achieved with a single non-bendable mirror. In this solution, however, the need for strong horizontal magnification results in a strong vertical magnification and into a very asymmetric image, the height being just a fraction of the width. We have studied... (More)
In this paper we present the refocusing optics for the new high pressure photoelectron spectroscopy (HP-XPS) branch line at MAX-lab, based on a plane grating monochromator with vertically collimated beam. For the HP-XPS instrument, the required spot size is dictated by the small geometric acceptance of the HP-XPS electron energy analyzer. Whereas a pair of bendable mirrors in a KB configuration has some advantages as refocusing elements, we have studied whether similar performance can be achieved with a single non-bendable mirror. In this solution, however, the need for strong horizontal magnification results in a strong vertical magnification and into a very asymmetric image, the height being just a fraction of the width. We have studied through an analytical geometrical model and ray tracing simulations the use of astigmatism to increase the vertical beam size up to the geometric acceptance of the detector. As a result the vertical beam size at sample plane is mostly determined by the photon angular distribution and is not dependent on the exit slit aperture size. In addition the vertical beam size can be controlled by the grating c(ff) parameter, making possible to adjust the photon density and minimize sample damage by the radiation. (Less)
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author
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organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
11th International Conference on Synchrotron Radiation Instrumentation (SRI 2012)
volume
425
article number
152005
publisher
IOP Publishing
conference name
11th International Conference on Synchrotron Radiation Instrumentation (SRI)
conference location
Lyon, France
conference dates
2012-07-09 - 2012-07-13
external identifiers
  • wos:000320403700205
  • scopus:84876252426
ISSN
1742-6588
1742-6596
DOI
10.1088/1742-6596/425/15/152005
language
English
LU publication?
yes
id
bdd67637-c9c2-4c89-a877-f4264d762f50 (old id 3979460)
date added to LUP
2016-04-01 10:34:47
date last changed
2024-01-06 20:11:59
@inproceedings{bdd67637-c9c2-4c89-a877-f4264d762f50,
  abstract     = {{In this paper we present the refocusing optics for the new high pressure photoelectron spectroscopy (HP-XPS) branch line at MAX-lab, based on a plane grating monochromator with vertically collimated beam. For the HP-XPS instrument, the required spot size is dictated by the small geometric acceptance of the HP-XPS electron energy analyzer. Whereas a pair of bendable mirrors in a KB configuration has some advantages as refocusing elements, we have studied whether similar performance can be achieved with a single non-bendable mirror. In this solution, however, the need for strong horizontal magnification results in a strong vertical magnification and into a very asymmetric image, the height being just a fraction of the width. We have studied through an analytical geometrical model and ray tracing simulations the use of astigmatism to increase the vertical beam size up to the geometric acceptance of the detector. As a result the vertical beam size at sample plane is mostly determined by the photon angular distribution and is not dependent on the exit slit aperture size. In addition the vertical beam size can be controlled by the grating c(ff) parameter, making possible to adjust the photon density and minimize sample damage by the radiation.}},
  author       = {{Grizolli, Walan and Hennies, Franz and Knudsen, Jan and Nyholm, Ralf and Sankari, Rami and Schnadt, Joachim}},
  booktitle    = {{11th International Conference on Synchrotron Radiation Instrumentation (SRI 2012)}},
  issn         = {{1742-6588}},
  language     = {{eng}},
  publisher    = {{IOP Publishing}},
  title        = {{Use of astigmatic re-focusing at HP-XPS end-station}},
  url          = {{http://dx.doi.org/10.1088/1742-6596/425/15/152005}},
  doi          = {{10.1088/1742-6596/425/15/152005}},
  volume       = {{425}},
  year         = {{2013}},
}