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Title: A Soft X-Ray (300-1000 eV) Active Grating Monochromator Beamline at NSRRC

Abstract

To accommodate the growing number of users in the soft X-ray spectroscopy research at NSRRC, we have developed a modified Dragon-type beamline, namely the active grating monochromator (AGM) beamline. In this beamline, a selected photon beam of 9 mrad radiation fan in the horizontal direction from a bending magnet is focused horizontally by a tangential elliptical mirror to a position 1.7 m after exit slit, and vertically by a cylindrical vertical focusing mirror (VFM) onto the entrance slit. After the entrance slit, the photon beam is energy-dispersed and vertically focused by an active grating onto the fixed exit slit. During the energy scan, the radius and shape of the active grating are adjusted accordingly, and therefore the defocus and coma aberrations terms can be effectively eliminated, and hence the energy resolution is optimized. Following the exit slit, the dispersed photon beam is refocused by a toroidal mirror onto the sample. Shadow ray-tracing program is employed to simulate the beamline performance. Results show that the energy resolution can reach 10000, 6000, and 3500 in the energy ranges of 300-400 eV, 400-600 eV, and above 600 eV, respectively. The total photon flux at sample position should reach 1x1012 phs/sec/200mA/0.1%BW, and the focusedmore » beam size at sample position is estimated to be 1 mm x 0.2 mm (H x V, FWHM). This beamline is currently under construction and will be ready for commission in December, 2006.« less

Authors:
; ; ; ; ; ; ;  [1]
  1. National Synchrotron Radiation Research Center, 101 Hsin-Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan (China)
Publication Date:
OSTI Identifier:
21052579
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: 10.1063/1.2436123; (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 BENDING MAGNETS; BEAM PRODUCTION; COMPUTERIZED SIMULATION; DIFFRACTION GRATINGS; ENERGY RESOLUTION; EV RANGE; FOCUSING; MIRRORS; MONOCHROMATORS; PERFORMANCE; PHOTON BEAMS; PHOTONS; SOFT X RADIATION; X-RAY SPECTROSCOPY

Citation Formats

Fung, H. S., Yuh, J. Y., Huang, L. J., Tseng, T. C., Perng, S. Y., Wang, D. J., Tsang, K. L., and Chung, S. C. A Soft X-Ray (300-1000 eV) Active Grating Monochromator Beamline at NSRRC. United States: N. p., 2007. Web. doi:10.1063/1.2436123.
Fung, H. S., Yuh, J. Y., Huang, L. J., Tseng, T. C., Perng, S. Y., Wang, D. J., Tsang, K. L., & Chung, S. C. A Soft X-Ray (300-1000 eV) Active Grating Monochromator Beamline at NSRRC. United States. doi:10.1063/1.2436123.
Fung, H. S., Yuh, J. Y., Huang, L. J., Tseng, T. C., Perng, S. Y., Wang, D. J., Tsang, K. L., and Chung, S. C. Fri . "A Soft X-Ray (300-1000 eV) Active Grating Monochromator Beamline at NSRRC". United States. doi:10.1063/1.2436123.
@article{osti_21052579,
title = {A Soft X-Ray (300-1000 eV) Active Grating Monochromator Beamline at NSRRC},
author = {Fung, H. S. and Yuh, J. Y. and Huang, L. J. and Tseng, T. C. and Perng, S. Y. and Wang, D. J. and Tsang, K. L. and Chung, S. C.},
abstractNote = {To accommodate the growing number of users in the soft X-ray spectroscopy research at NSRRC, we have developed a modified Dragon-type beamline, namely the active grating monochromator (AGM) beamline. In this beamline, a selected photon beam of 9 mrad radiation fan in the horizontal direction from a bending magnet is focused horizontally by a tangential elliptical mirror to a position 1.7 m after exit slit, and vertically by a cylindrical vertical focusing mirror (VFM) onto the entrance slit. After the entrance slit, the photon beam is energy-dispersed and vertically focused by an active grating onto the fixed exit slit. During the energy scan, the radius and shape of the active grating are adjusted accordingly, and therefore the defocus and coma aberrations terms can be effectively eliminated, and hence the energy resolution is optimized. Following the exit slit, the dispersed photon beam is refocused by a toroidal mirror onto the sample. Shadow ray-tracing program is employed to simulate the beamline performance. Results show that the energy resolution can reach 10000, 6000, and 3500 in the energy ranges of 300-400 eV, 400-600 eV, and above 600 eV, respectively. The total photon flux at sample position should reach 1x1012 phs/sec/200mA/0.1%BW, and the focused beam size at sample position is estimated to be 1 mm x 0.2 mm (H x V, FWHM). This beamline is currently under construction and will be ready for commission in December, 2006.},
doi = {10.1063/1.2436123},
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 optical design and mechanical solution for a soft x-ray beamline BL-7A in PF-KEK for the energy range 10--1000 eV with a PGM are described. The optical characteristics of the beamline are tested with gas phase absorption and photoelectron spectroscopy.
  • By using two aspherical variable-line-space active gratings and applying the energy compensation principle, we have designed a very efficient active grating monochromator -- active grating spectrometer (AGM-AGS) beamline system for the photon demanding inelastic soft-x-ray scattering experiments. During the energy scan, the defocus and coma aberrations of the AGM can be completely eliminated to make the focal point fixed at the sample position and to maintain high spectral resolution for the entire spectral range. The AGS, which has an optical system identical to that of the AGM, but positioned reversely along the optical path, collects the photons emitted from themore » sample with a nearly identical energy spread as the AGM and focus them onto a position sensitive detector located at the exit slit position. The ray tracing results show that the efficiency of the AGM-AGS is two orders of magnitudes higher than that of conventional design while maintaining a very high spectral resolution.« less
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