skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Soft x-ray undulator for the Siam Photon Source

Abstract

An undulator for production of intense soft x-rays has been designed for the Siam Photon Source. The construction of the undulator has been completed. It is now being characterized and prepared for installation. The device, named U60, is a pure permanent magnet planar undulator, consisting of 41 magnetic periods, with 60 mm period length. Utilization of the undulator radiation in the photon energy range of 30 - 900 eV is expected. The design studies of the magnetic structure, including investigation of perturbations arising from the magnetic field of the device, their effects on the SPS storage ring and compensation schemes are described. A magnetic measurement system has been constructed for magnetic characterization of the device. Partial results of magnetic measurements are presented.

Authors:
 [1];  [2];  [3]; ; ; ; ; ; ; ;  [1]
  1. National Synchrotron Research Center, P.O. Box 93, Nakhon Ratchasima, 30000 (Thailand)
  2. (Thailand)
  3. School of Physics, Suranaree University of Technology, 111 University Avenue, Muang Distrct, Nakhon Ratchasima, 30000 (Thailand)
Publication Date:
OSTI Identifier:
21043438
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: 10.1063/1.2436068; (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; DESIGN; DISTURBANCES; EV RANGE; INSTALLATION; MAGNETIC FIELDS; PERMANENT MAGNETS; PHOTON BEAMS; PHOTONS; SOFT X RADIATION; STORAGE RINGS; THAILAND; WIGGLER MAGNETS

Citation Formats

Rugmai, S., School of Physics, Suranaree University of Technology, 111 University Avenue, Muang Distrct, Nakhon Ratchasima, 30000, Dasri, T., Prawanta, S., Siriwattanapaitoon, S., Kwankasem, A., Sooksrimuang, V., Chachai, W., Suradet, N., Juthong, N., and Tancharakorn, S.. Soft x-ray undulator for the Siam Photon Source. United States: N. p., 2007. Web. doi:10.1063/1.2436068.
Rugmai, S., School of Physics, Suranaree University of Technology, 111 University Avenue, Muang Distrct, Nakhon Ratchasima, 30000, Dasri, T., Prawanta, S., Siriwattanapaitoon, S., Kwankasem, A., Sooksrimuang, V., Chachai, W., Suradet, N., Juthong, N., & Tancharakorn, S.. Soft x-ray undulator for the Siam Photon Source. United States. doi:10.1063/1.2436068.
Rugmai, S., School of Physics, Suranaree University of Technology, 111 University Avenue, Muang Distrct, Nakhon Ratchasima, 30000, Dasri, T., Prawanta, S., Siriwattanapaitoon, S., Kwankasem, A., Sooksrimuang, V., Chachai, W., Suradet, N., Juthong, N., and Tancharakorn, S.. Fri . "Soft x-ray undulator for the Siam Photon Source". United States. doi:10.1063/1.2436068.
@article{osti_21043438,
title = {Soft x-ray undulator for the Siam Photon Source},
author = {Rugmai, S. and School of Physics, Suranaree University of Technology, 111 University Avenue, Muang Distrct, Nakhon Ratchasima, 30000 and Dasri, T. and Prawanta, S. and Siriwattanapaitoon, S. and Kwankasem, A. and Sooksrimuang, V. and Chachai, W. and Suradet, N. and Juthong, N. and Tancharakorn, S.},
abstractNote = {An undulator for production of intense soft x-rays has been designed for the Siam Photon Source. The construction of the undulator has been completed. It is now being characterized and prepared for installation. The device, named U60, is a pure permanent magnet planar undulator, consisting of 41 magnetic periods, with 60 mm period length. Utilization of the undulator radiation in the photon energy range of 30 - 900 eV is expected. The design studies of the magnetic structure, including investigation of perturbations arising from the magnetic field of the device, their effects on the SPS storage ring and compensation schemes are described. A magnetic measurement system has been constructed for magnetic characterization of the device. Partial results of magnetic measurements are presented.},
doi = {10.1063/1.2436068},
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 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
  • 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 current performance of a 10-m grazing incidence monochromator (GIM) is described. A resolution of 51, 95, and 220 meV (FWHM) has been achieved at 287, 401, and 867 eV, respectively, inferred from the linewidths for the {ital K}-shell resonances of gaseous CO, N{sub 2}, and Ne. A photon flux of {congruent}10{sup 12} photons/s is obtainable at the first harmonic of undulator radiation with a 1200-l /mm grating and 50-{mu}m slit openings, which correspond to {Delta}{lambda}=0.04 A.
  • A soft x-ray beam line which enables high resolution and high flux at the same time is being developed at the Photon Factory for advanced characterization of new functional materials. The beam line is designed based on a cylindrical element monochromator (CEM) concept using undulator radiation from a 27-pole multipole wiggler/undulator. The photon energy range of the beam line is 200--1000 eV which covers the core-level excitation energy of carbon, nitrogen, and oxygen. Ray tracing simulation shows that the resolving power ({lambda}/{Delta}{lambda}) is over 12 000 at 30 A with a throughput of 25% when the opening of the exitmore » slit is 10 {mu}m. The beam line will supply x rays which facilitate both x-ray absorption (XAS) and photoelectron (XPS) spectroscopic measurements with extremely high energy resolution.« less
  • A cooling system for the first crystal of a double-crystal monochromator for a 60-period soft x-ray undulator at the Photon Factory is newly designed and installed. In order to keep smooth movements of the original mechanism in a high-vacuum chamber, heat pipes and a liquid-metal bath are utilized. A fear for melting of an InSb crystal and the instability caused by warming of mechanisms have vanished and significantly improved energy resolution of 5000--8000 is achieved by Si crystals for high photon flux of about 10{sup 11} photons/s in a beam size of 3{times}3 mm{sup 2} at a sample position withmore » the cooling system.« less