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Title: Performance of X-ray Beam lines at Superconducting Wavelength Shifter

Abstract

To fully utilize a hard X-ray source generated by a 5-Tesla superconducting wavelength shifter (SWLS) that shifts the critical energy of synchrotron spectrum from 2.1 to 7.5 keV, we have designed and constructed three hard X-ray beamlines, BL01A, BL01B, and BL0IC. BL01A is a white light beamline for phase-contrast X-ray image applications. The spatial resolution of phase-contrast X-ray image is 1 {mu}m. The photon flux can saturate a camera of 700-microns field-of-view within 10 ms. BL01B equipped with a double crystal monochromator (DCM) and a toroidal focusing mirror, which provides photon beams with energies from 5 to 20 keV, is adequate for scattering related experiments and hard X-ray microscopy. The energy-resolution {delta}E/E is 1 x 10-3. The photon flux is optimized to be 4.5 x 1011 photons s-1 with 200 mA ring current, which outcasts the flux of the wiggler beamline BL17B by 110 times at 15 keV. BL01C equipped with a DCM and both collimating and focusing mirrors, covering photon energies from 6 to 33 keV, is ideal for EXAFS and X-ray diffraction (XRD) experiments. The average photon flux is 3 x 1010 photons s-1 with 200 mA ring current. The energy-resolution is between 1.7 x 10-4 and 3.0more » x 10-4. In this article, we will present the measured performance of these beamlines.« less

Authors:
; ; ; ; ; ; ; ; ; ; ; ;  [1];  [2]
  1. National Synchrotron Radiation Research Center, Hsinchu 30076, Taiwan (China)
  2. Institute of Physics, Academia Sinica, Taipei 11529, Taiwan (China)
Publication Date:
OSTI Identifier:
21052640
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: 10.1063/1.2436183; (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; CRYSTALS; ENERGY RESOLUTION; FINE STRUCTURE; FOCUSING; HARD X RADIATION; KEV RANGE; MIRRORS; MONOCHROMATORS; PERFORMANCE; PHASE SHIFT; PHOTON BEAMS; PHOTONS; RING CURRENTS; SPATIAL RESOLUTION; SUPERCONDUCTING DEVICES; SYNCHROTRON RADIATION; WAVELENGTHS; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY

Citation Formats

Song, Y. F., Chang, C. H., Liu, C. Y., Chang, S. H., Jeng, U., Lai, Y. H., Liu, D. G., Yin, G. C., Lee, J. F., Sheu, H. S., Chung, S. C., Tsang, K. L., Liang, K. S., and Hwu, Y.. Performance of X-ray Beam lines at Superconducting Wavelength Shifter. United States: N. p., 2007. Web. doi:10.1063/1.2436183.
Song, Y. F., Chang, C. H., Liu, C. Y., Chang, S. H., Jeng, U., Lai, Y. H., Liu, D. G., Yin, G. C., Lee, J. F., Sheu, H. S., Chung, S. C., Tsang, K. L., Liang, K. S., & Hwu, Y.. Performance of X-ray Beam lines at Superconducting Wavelength Shifter. United States. doi:10.1063/1.2436183.
Song, Y. F., Chang, C. H., Liu, C. Y., Chang, S. H., Jeng, U., Lai, Y. H., Liu, D. G., Yin, G. C., Lee, J. F., Sheu, H. S., Chung, S. C., Tsang, K. L., Liang, K. S., and Hwu, Y.. Fri . "Performance of X-ray Beam lines at Superconducting Wavelength Shifter". United States. doi:10.1063/1.2436183.
@article{osti_21052640,
title = {Performance of X-ray Beam lines at Superconducting Wavelength Shifter},
author = {Song, Y. F. and Chang, C. H. and Liu, C. Y. and Chang, S. H. and Jeng, U. and Lai, Y. H. and Liu, D. G. and Yin, G. C. and Lee, J. F. and Sheu, H. S. and Chung, S. C. and Tsang, K. L. and Liang, K. S. and Hwu, Y.},
abstractNote = {To fully utilize a hard X-ray source generated by a 5-Tesla superconducting wavelength shifter (SWLS) that shifts the critical energy of synchrotron spectrum from 2.1 to 7.5 keV, we have designed and constructed three hard X-ray beamlines, BL01A, BL01B, and BL0IC. BL01A is a white light beamline for phase-contrast X-ray image applications. The spatial resolution of phase-contrast X-ray image is 1 {mu}m. The photon flux can saturate a camera of 700-microns field-of-view within 10 ms. BL01B equipped with a double crystal monochromator (DCM) and a toroidal focusing mirror, which provides photon beams with energies from 5 to 20 keV, is adequate for scattering related experiments and hard X-ray microscopy. The energy-resolution {delta}E/E is 1 x 10-3. The photon flux is optimized to be 4.5 x 1011 photons s-1 with 200 mA ring current, which outcasts the flux of the wiggler beamline BL17B by 110 times at 15 keV. BL01C equipped with a DCM and both collimating and focusing mirrors, covering photon energies from 6 to 33 keV, is ideal for EXAFS and X-ray diffraction (XRD) experiments. The average photon flux is 3 x 1010 photons s-1 with 200 mA ring current. The energy-resolution is between 1.7 x 10-4 and 3.0 x 10-4. In this article, we will present the measured performance of these beamlines.},
doi = {10.1063/1.2436183},
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}
}
  • A Superconducting Wavelength Shifter (SWLS) insertion device with peak field of 6 Tesla has been installed in the Taiwan Light Source (TLS) storage ring to increase the critical energy of the radiation spectrum from 2 keV to 9 keV. We are constructing three hard X-ray beamlines BL01A, BL01B and BL01C to utilize the photon source generated by this insertion device. The beamline BL01B is a DCM X-ray beamline with a toroidal focusing mirror, which provides monochromatic photon beams with energies from 5 keV to 20 keV for X-ray scattering experiments. At the sample position, the expected photon flux is aboutmore » 7x1011 photon/sec/200mA with an average energy resolution ({delta}E/E) of 1x10-3 and the focused beam size is about 1 mm x 0.4 mm. The beamline BL01C is a standard DCM X-ray beamline with both collimating and focusing mirrors, which will deliver monochromatic photon beams with energy ranging from 6 keV to 33 keV for EXAFS and powder diffraction. At the sample position, the expected photon flux is 1x1011 photon/sec /200mA with an average energy resolution ({delta}E/E) of 1.6x10-4 and the focused beam size is about 0.9 mm x 0.2 mm. The beamline BL01A is a white-light beamline reserved for other applications. Both BL01A and BL01B beamlines have been constructed and are in commissioning. An average photon flux of 3x1011 photon/sec has been obtained at beamline BL01B.« less
  • A method for differential-phase-contrast imaging in scanning x-ray microscopy is proposed. The microfocus beam is produced with an x-ray focusing optics, and a half of the optical aperture is masked with a λ/2 phase shifter. This generates a pair of focused beam at the focal plane, with π phase difference. Combining with a diaphragm in front of the transmission beam detector, differential phase contrast (contrast proportional to the phase-difference between two foci) can be obtained. Preliminary results with a Fresnel zone plate focusing optics at 12.4 keV x-ray energy are shown.
  • The general case of a true wavelength distribution l lambda )d lambda modified by a factor f( lambda ) is considered. Expressions for the true and the modified centroids are derived. The fractional change in the centroid wavelength is DELTA lambda / lambda == Vf / lambda f, where V is the wavelength variance. The fractional rate of change of quantum counting efficiency with wavelength, f / f, is measured for Geiger, proportional (Xe), proportional (Kr), film, and scintillation detectors for wavelengths of Mo, Cu, and Cr K alpha radiations. Results are represented in graphic and tabular forms. (L.N.N.)
  • Accurate atomic transition data are important in many astronomical research areas, especially for studies of line spectroscopy. Whereas transition data of He-like and H-like ions (i.e., ions in high-charge states) have been accurately calculated, the corresponding data of K transitions of neutral or low-ionized metal elements are still very uncertain. Spectroscopy of absorption lines produced in the interstellar medium (ISM) has been proven to be an effective way to measure the central wavelengths of these atomic transitions. In this work, we analyze 36 Chandra High Energy Transmission Grating observations to search for and measure the ISM absorption lines along sightmore » lines to 11 low-mass X-ray binaries. We correct the Galactic rotation velocity to the rest frame for every observation and then use two different methods to merge all the corrected spectra to a co-added spectrum. However, the co-added spectra obtained by this method exhibit biases, toward to either observations with high counts or lines with high signal-to-noise ratios. We do a Bayesian analysis of several significantly detected lines to obtain the systematic uncertainty and the bias correction for other lines. Compared to previous studies, our results improve the wavelength accuracy by a factor of two to five and significantly reduce the systematic uncertainties and biases. Several weak transitions (e.g., 1s-2p of Mg IV and Mg V; 1s-3p of Mg III and Mg V) are also detected for the first time, albeit with low significance; future observations with improved accuracy are required to confirm these detections.« less