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Title: Design of a Toroidal VLS Monochromator Grating for Photon Energies from 3 to 8 keV

Abstract

A design procedure of an imaging grating monochromator for the photon energy range from 3 to 8 keV is described. The mutual optimization of the toroidal grating with varied line spacing and of the monochromator configuration results in a theoretical resolving power of more than 1000. A significant improvement by more than a factor of 10 is achieved by changing the long toroidal radius with the photon energy by bending the substrate.

Authors:
 [1]
  1. Carl Zeiss Optronics GmbH, 73446 Oberkochen (Germany)
Publication Date:
OSTI Identifier:
21052603
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 879; Journal Issue: 1; Conference: 9. international conference on synchrotron radiation instrumentation, Daegu (Korea, Republic of), 28 May - 2 Jun 2006; Other Information: DOI: 10.1063/1.2436148; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; BEAM PRODUCTION; CONFIGURATION; DESIGN; DIFFRACTION GRATINGS; KEV RANGE; MONOCHROMATORS; OPTIMIZATION; PHOTON BEAMS; PHOTONS; SUBSTRATES; SYNCHROTRON RADIATION; SYNCHROTRON RADIATION SOURCES

Citation Formats

Heidemann, Klaus F. Design of a Toroidal VLS Monochromator Grating for Photon Energies from 3 to 8 keV. United States: N. p., 2007. Web. doi:10.1063/1.2436148.
Heidemann, Klaus F. Design of a Toroidal VLS Monochromator Grating for Photon Energies from 3 to 8 keV. United States. doi:10.1063/1.2436148.
Heidemann, Klaus F. Fri . "Design of a Toroidal VLS Monochromator Grating for Photon Energies from 3 to 8 keV". United States. doi:10.1063/1.2436148.
@article{osti_21052603,
title = {Design of a Toroidal VLS Monochromator Grating for Photon Energies from 3 to 8 keV},
author = {Heidemann, Klaus F.},
abstractNote = {A design procedure of an imaging grating monochromator for the photon energy range from 3 to 8 keV is described. The mutual optimization of the toroidal grating with varied line spacing and of the monochromator configuration results in a theoretical resolving power of more than 1000. A significant improvement by more than a factor of 10 is achieved by changing the long toroidal radius with the photon energy by bending the substrate.},
doi = {10.1063/1.2436148},
journal = {AIP Conference Proceedings},
number = 1,
volume = 879,
place = {United States},
year = {Fri Jan 19 00:00:00 EST 2007},
month = {Fri Jan 19 00:00:00 EST 2007}
}
  • The combination of a plane linear grating and a plane mirror is known for giving high resolution monochromators, especially when used in collimated beam between sagittaly focusing mirrors. It is shown here that, if a varied line spacing grating is used instead of the linear one, the combination may have an intrinsic focusing power and does not require any internal focusing mirror. The condition for this is to keep constant the ratio of the cosines of grating incidence and emergence angles, and this ratio should be smaller than 1. The combination is compatible with a line illumination of the gratingmore » and therefore allows the use of variable groove depth (VGD) gratings that will extend the working range of each grating. Examples taken from beamlines under construction at SOLEIL are given and the predicted resolving power is compared to a classical configuration.« less
  • A W/C multilayer laminar-type holographic grating was fabricated and its diffraction efficiency was evaluated in the 1-8 keV region. Taking advantage of its high diffraction efficiency a monochromator equipped with a multilayer varied-line-spacing plane grating was designed. The throughput of the monochromator based on the experimental diffraction efficiency of the multilayer grating and resolving power were calculated in comparison with those of a monochromator equipped with a Au coated grating.
  • The holographic plane grating with grooves of a radial form and its imaging properties in a converging beam are analyzed. The results are applied to the design of conical diffraction monochromators for the 1-4 keV region, and their expected performances are examined by means of ray tracing in comparison with the corresponding ruled radial grating. Design examples show that, in a conical diffraction monochromator covering the energy region of 1-4 keV, the holographic grating thus designed exhibits a resolving power equivalent to that of the ruled radial grating.
  • No abstract prepared.
  • A resolving power, [ital E]/[Delta][ital E], of [ge]13 000 has been achieved with the modified 6 m/160[degree] toroidal grating monochromator (TGM) installed on Beam Line 8-1 at the Stanford Synchrotron Radiation Laboratory. The resolving power of the TGM was increased by replacing the entrance and exit slits with high-precision slits, masking the horizontal part (short radius) of the grating, and improving the TGM scanning mechanisms. To determine the performance of the monochromator, we measured the dependences of resolution and photon flux on the entrance- and exit-slit widths, the exit-slit position, and the masking of the grating. The monochromator resolution inmore » the energy range of 25--65 eV was derived from photoionization measurements of extremely narrow core-excitation resonances in He and Ne. With 10-[mu]m vertical entrance- and exit-slit widths and 32% mask opening of the grating, the monochromator has a resolution (full-width at half maximum) of 5.0[plus minus]0.7 meV at a photon energy of 64.5 eV and a flux of 2[times]10[sup 7] photons/s/100 mA. The results suggest a simple procedure for converting a TGM with moderate resolution into a high-resolution monochromator with a moderate reduction in photon flux due to masking the grating, beyond the reduction attributable to the slit widths.« less