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Title: X-ray Absorption Spectroscopy Beamline at the Siam Photon Laboratory

Abstract

A bending magnet beamline has been constructed and commissioned for x-ray absorption spectroscopy (XAS) at the Siam Photon Laboratory. The photon energy is tunable from 1830 eV to 8000 eV using a Lemmonier-type, fixed-exit double crystal monochromator equipped with InSb(111), Si(111), Ge(220) crystals. Elemental K-edges are then accessible from silicon to iron. A series of low conductance vacuum tubes has been designed and installed between the pumping chambers in the front end to obtain the proper pressure difference between the upstream and the downstream of the front end. Thus lower-energy photons, around K-edges of silicon, phosphorous, and sulfur, can be delivered to the experimental XAS station without being absorbed by a window. In this report, the design of the beamline is described. The commissioning results including the measured photon flux at sample and experimental XAS spectra are presented.

Authors:
; ; ; ;  [1];  [1];  [2]
  1. National Synchrotron Research Center, 111 University Ave., Muang District, Nakhon Ratchasima 30000 (Thailand)
  2. (Thailand)
Publication Date:
OSTI Identifier:
21052654
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: 10.1063/1.2436196; (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; ABSORPTION SPECTROSCOPY; BEAM BENDING MAGNETS; BEAM PRODUCTION; COMMISSIONING; CRYSTALS; DESIGN; EV RANGE; INDIUM ANTIMONIDES; IRON; MONOCHROMATORS; PHOTON BEAMS; PHOTONS; SILICON; THAILAND; X-RAY SPECTRA; X-RAY SPECTROSCOPY

Citation Formats

Klysubun, Wantana, Tarawarakarn, Pongjakr, Sombunchoo, Panidtha, Klinkhieo, Supat, Chaiprapa, Jitrin, Songsiriritthigul, Prayoon, and School of Physics, Suranaree University of Technology, Nakhon Ratchasima 30000. X-ray Absorption Spectroscopy Beamline at the Siam Photon Laboratory. United States: N. p., 2007. Web. doi:10.1063/1.2436196.
Klysubun, Wantana, Tarawarakarn, Pongjakr, Sombunchoo, Panidtha, Klinkhieo, Supat, Chaiprapa, Jitrin, Songsiriritthigul, Prayoon, & School of Physics, Suranaree University of Technology, Nakhon Ratchasima 30000. X-ray Absorption Spectroscopy Beamline at the Siam Photon Laboratory. United States. doi:10.1063/1.2436196.
Klysubun, Wantana, Tarawarakarn, Pongjakr, Sombunchoo, Panidtha, Klinkhieo, Supat, Chaiprapa, Jitrin, Songsiriritthigul, Prayoon, and School of Physics, Suranaree University of Technology, Nakhon Ratchasima 30000. Fri . "X-ray Absorption Spectroscopy Beamline at the Siam Photon Laboratory". United States. doi:10.1063/1.2436196.
@article{osti_21052654,
title = {X-ray Absorption Spectroscopy Beamline at the Siam Photon Laboratory},
author = {Klysubun, Wantana and Tarawarakarn, Pongjakr and Sombunchoo, Panidtha and Klinkhieo, Supat and Chaiprapa, Jitrin and Songsiriritthigul, Prayoon and School of Physics, Suranaree University of Technology, Nakhon Ratchasima 30000},
abstractNote = {A bending magnet beamline has been constructed and commissioned for x-ray absorption spectroscopy (XAS) at the Siam Photon Laboratory. The photon energy is tunable from 1830 eV to 8000 eV using a Lemmonier-type, fixed-exit double crystal monochromator equipped with InSb(111), Si(111), Ge(220) crystals. Elemental K-edges are then accessible from silicon to iron. A series of low conductance vacuum tubes has been designed and installed between the pumping chambers in the front end to obtain the proper pressure difference between the upstream and the downstream of the front end. Thus lower-energy photons, around K-edges of silicon, phosphorous, and sulfur, can be delivered to the experimental XAS station without being absorbed by a window. In this report, the design of the beamline is described. The commissioning results including the measured photon flux at sample and experimental XAS spectra are presented.},
doi = {10.1063/1.2436196},
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}
}
  • Construction of a soft x-ray lithography beamline utilizing synchrotron radiation generated by one of the bending magnets at the Siam Photon Laboratory is finished and the beamline is currently in a commissioning period. The beamline was modified from the existing monitoring beamline and is intended for soft x-ray lithographic processing and radiation biological research. The lithography exposure station with a compact one-dimensional scanning mechanism was constructed and assembled in-house. The front-end of the beamline has been modified to allow larger exposure area. The exposure station for studying radiation effects on biological samples will be set up in tandem with themore » lithography station, with a Mylar window for isolation. Several improvements to both the beamline and the exposure stations, such as improved scanning speed and the ability to adjust the exposure spectrum by means of low-Z filters, are planned and will be implemented in the near future.« less
  • The synchrotron radiation from the first undulator at the Siam Photon Laboratory was characterized with the photon beam position monitors (BPMs) and grating monochromator. The soft x-ray undulator beamline employs a varied line-spacing plane grating monochromator with three interchangeable gratings. Since 2010, the beamline has delivered photons with energy of 40-160 and 220-1040 eV at the resolving power of 10,000 for user services at the two end- stations that utilize the photoemission electron spectroscopy and microscopy techniques. The undulator power-density distributions measured by the 0.05-mm wire-scan BPM were in good agreement with those in simulation. The flux-density distributions were evaluatedmore » in the red-shift measurements, which identify the central cone of radiation and its distribution. Since 2014, the operation of the other insertion devices in the storage ring has started, and consequently bought about the increases in the emittance from 41 to 61 nm·rad and the coupling constant from 4 to 11%. The local electron-orbit correction greatly improved the alignment of the electron beam in the undulator section resulting in the improvements of the photon flux and harmonics peaks of the undulator radiation.« less
  • The commissioning results obtained from the first beamline of the Siam Photon Source are reported. The beamline is a VUV beamline in which light is monochromatized over the energy range between 20-240 eV. The wavelength calibration was carried out by photoemission measurements using the Fermi edge of gold as the standard. The optical beamline and the experimental station have been tested while the Siam Photon Source was still in the commissioning period. This gave rise to undesirable problems: the large electron beam size, the beam instability and the following intensity fluctuation. Such problem has been overcome up to the present.more » The photoemission measurements are being carried out on Ni(111)« less
  • The evaluations of the monochromator of the BL4 beamline at the Siam Photon Laboratory were carried out by gas-phase photoionization measurements. The beamline employs a varied-line-spacing plane grating monochromator, which delivers photons with energies between 20-240 eV. The resolving power of the monochromator depends strongly with the alignment of the exit slit. The designed resolving power of 5000 has been achieved. The experimental station of the beamline has been upgraded for surface and interface research. The new experimental station removes the disadvantage and expands the capabilities of the old one in such a way that photoemission experiments using synchrotron lightmore » can be performed in parallel with other in situ surface analysis techniques, as well as with preparation of other samples. The new system includes the old photoemission system and a multi-UHV-chamber system. The standard surface-sensitive techniques available in addition to photoemission spectroscopy using synchrotron light are UPS, XPS, AES and LEED. The new experimental station also includes a metal MBE system for preparing samples for the studies of ultra-thin magnetic films and metal-semiconductor interfaces.« less
  • This report presents the optical design and optical simulations for the first infrared beamline at the Siam Photon Laboratory. The beamline collects the edge radiation and bending magnet radiation, producing from the BM4 bending magnet of the 1.2 GeV storage ring of the Siam Photon Source. The optical design is optimized for the far- to mid-infrared spectral range (4000-100 cm{sup -1}) for microspectroscopic applications. The optical performance has been examined by computer simulations.