The in-focus variable line spacing plane grating monochromator

In early 2007 an elliptically polarized Apple II undulator was installed on an LNLS storage ring. It will provide photons to the first PGM beamline at LNLS designed to deliver photons ranging from 100 to 1000 eV with a resolving power of over 10 000. The beamline is about to start the commissioning process and this paper describes mainly the monochromator design and construction.

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A variable fixed-focus constant optimization method for a variable-included-angle varied-line-spacing plane-grating monochromator

Journal of Synchrotron Radiation ◽

10.1107/s1600577519004569 ◽

2019 ◽

Vol 26 (4) ◽

pp. 1192-1197 ◽

Cited By ~ 1

Author(s):

Chaofan Xue ◽

Lian Xue ◽

Yanqing Wu ◽

Yong Wang ◽

Shumin Yang ◽

...

Keyword(s):

Optimization Method ◽

The Self ◽

Resolving Power ◽

Correction Function ◽

Aberration Correction ◽

Included Angle ◽

Variable Line ◽

Self Focusing ◽

Line Spacing ◽

Grating Monochromator

Variable-included-angle varied-line-spacing plane-grating monochromators (VIA-VPGM) have been applied to many beamlines because of the self-focusing and aberration-correction function of the varied-line-spacing grating. Unfortunately, to optimize the variable-line-spacing coefficient of the grating, the fixed-focus constant (C ff) has to be fixed first in the VIA-VPGM. In this way, some of the advantages of these monochromators are lost, such as the flexibility of choosing a different energy-resolving power by varying the C ff. In this work, a variable C ff optimization method is introduced for a VIA-VPGM. By adopting this method, the C ff could be arbitrarily selected in the VIA-VPGM.

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First results of SRC’s new high‐energy resolution variable line density grating monochromator beamline: HERMON

Review of Scientific Instruments ◽

10.1063/1.1145731 ◽

1995 ◽

Vol 66 (2) ◽

pp. 2072-2074 ◽

Cited By ~ 13

Author(s):

M. Bissen ◽

M. Fisher ◽

G. Rogers ◽

D. Eisert ◽

K. Kleman ◽

...

Keyword(s):

Energy Resolution ◽

High Energy ◽

High Energy Resolution ◽

Line Density ◽

Variable Line ◽

First Results ◽

Grating Monochromator

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A simple variable line space grating monochromator for synchrotron light source beamlines

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment ◽

10.1016/0168-9002(92)90543-d ◽

1992 ◽

Vol 319 (1-3) ◽

pp. 128-134 ◽

Cited By ~ 22

Author(s):

T.A. Callcott ◽

W.L. O'Brien ◽

J.J. Jia ◽

Q.Y. Dong ◽

D.L. Ederer ◽

...

Keyword(s):

Light Source ◽

Variable Line ◽

Grating Monochromator ◽

Synchrotron Light ◽

Line Space

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Design of an ultrahigh-energy-resolution and wide-energy-range soft X-ray beamline

Journal of Synchrotron Radiation ◽

10.1107/s1600577513029093 ◽

2013 ◽

Vol 21 (1) ◽

pp. 273-279 ◽

Cited By ~ 9

Author(s):

L. Xue ◽

R. Reininger ◽

Y.-Q. Wu ◽

Y. Zou ◽

Z.-M. Xu ◽

...

Keyword(s):

Energy Range ◽

Energy Resolution ◽

Wide Energy Range ◽

Ultrahigh Energy ◽

Exit Slit ◽

Shanghai Synchrotron Radiation Facility ◽

X Ray ◽

Variable Line ◽

Line Spacing ◽

Wide Energy

A new ultrahigh-energy-resolution and wide-energy-range soft X-ray beamline has been designed and is under construction at the Shanghai Synchrotron Radiation Facility. The beamline has two branches: one dedicated to angle-resolved photoemission spectroscopy (ARPES) and the other to photoelectron emission microscopy (PEEM). The two branches share the same plane-grating monochromator, which is equipped with four variable-line-spacing gratings and covers the 20–2000 eV energy range. Two elliptically polarized undulators are employed to provide photons with variable polarization, linear in every inclination and circular. The expected energy resolution is approximately 10 meV at 1000 eV with a flux of more than 3 × 1010 photons s−1at the ARPES sample positions. The refocusing of both branches is based on Kirkpatrick–Baez pairs. The expected spot sizes when using a 10 µm exit slit are 15 µm × 5 µm (horizontal × vertical FWHM) at the ARPES station and 10 µm × 5 µm (horizontal × vertical FWHM) at the PEEM station. The use of plane optical elements upstream of the exit slit, a variable-line-spacing grating and a pre-mirror in the monochromator that allows the influence of the thermal deformation to be eliminated are essential for achieving the ultrahigh-energy resolution.

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A new extra-focus monochromator designed for high-performance VUV beamlines

Journal of Synchrotron Radiation ◽

10.1107/s1600577514025260 ◽

2015 ◽

Vol 22 (2) ◽

pp. 328-335 ◽

Cited By ~ 3

Author(s):

Chaofan Xue ◽

Yanqing Wu ◽

Ying Zou ◽

Lian Xue ◽

Yong Wang ◽

...

Keyword(s):

High Performance ◽

Vacuum Ultraviolet ◽

Wide Energy Range ◽

X Ray ◽

Ultraviolet Range ◽

Line Spacing ◽

Wide Energy ◽

Focus Spot ◽

Grating Monochromator ◽

Mechanical Compatibility

A new monochromator called an extra-focus constant-included-angle varied-line-spacing (VLS) cylindrical-grating monochromator (extra-focus CIA-VCGM) is described. This monochromator is based on the Hettrick–Underwood scheme where the plane VLS grating is replaced by a cylindrical one in order to zero the defocus at three reference photon energies in the vacuum-ultraviolet range. It has a simple mechanical structure and a fixed focus spot with high performance over a wide energy range. Furthermore, its mechanical compatibility with a standard VLS plane-grating monochromator allows convenient extension into the soft-X-ray range.

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