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Title: The ACCM Beamlines For Bioscience Studies

Abstract

To meet the increasing demand of X-ray beamlines for bioscience research, we have designed two high-performance, side-branch, asymmetric-cut curved crystal monochromator (ACCM) beamlines to fully utilize the sideway output of the superconducting wiggler SW6 at NSRRC. Each of these two beamlines (BL13A and BL13C) collects 1 mrad of the radiation fan in the horizontal direction, one centered at 3 mrad and the other at 4 mrad away from the central line of the wiggler output. The newly designed ACCMs are capable of energy scanning from 12 keV to 14 keV and offer good performances in terms of flux, resolution and stability. The ACCMs are designed and built in-house, combining efficient cooling and bending mechanisms in a compact unit that allows precise adjustments on a goniometer assembly. The bender is specially designed with symmetrically driven piezo-actuators that minimize center displacement during bending. Both direct and indirect cooling methods were tested; the former using Ga/In directly under the beam footprint and the latter using both sides of the crystal clamping area for cooling. Performance of the beamlines employing both cooling methods has been measured. The indirect cooling method provides 4.9 x 1010 photons/sec through a pair of 100 {mu}m slits (H xmore » V) with energy resolution of 5.3 x 10-3 ({delta}E/E) at 12.7 keV. Higher energy resolution in the 10-4 range can be achieved by adjusting the horizontal source fan or the crystal radius at the expense of flux. The direct cooling method provides 1.4 x 1010 photons/sec through a pair of 100 {mu}m slits (H x V) with energy resolution of 1.2 x 10-3 ({delta}E/E) at 12.7 keV. The FWHM of the focused beam profile in the indirect cooling mode is 800 x 109 {mu}m (H x V), and 800 x 283 {mu}m (H x V) in the direct cooling mode with some horizontal tail, the latter being larger due to influence of the Ga/In layer on the crystal shape. Cooling efficiency is excellent in the direct cooling mode, in which the performance stabilizes in a few seconds after the photon shutter is opened, and in the indirect cooling mode the performance stabilizes in a few minutes. At present, both SW6 side-branch beamlines are ready for uses' bioscience research: BL13C for crystal screening, drug design, and high-resolution structural study, and BL13A for scattering experiments on biomaterials such as membranes.« less

Authors:
; ; ; ; ;  [1]
  1. National Synchrotron Radiation Research Center, 101 Hsin Ann Road, Hsinchu Science Park, Hsinchu 30076, Taiwan (China)
Publication Date:
OSTI Identifier:
21052645
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: 10.1063/1.2436188; (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; ACTUATORS; ASYMMETRY; BEAM BENDING MAGNETS; BEAM PRODUCTION; BEAM PROFILES; CRYSTALS; DESIGN; ENERGY RESOLUTION; GONIOMETERS; KEV RANGE; LAYERS; MONOCHROMATORS; PERFORMANCE; PHOTON BEAMS; SHUTTERS; STABILITY; SUPERCONDUCTING MAGNETS; X RADIATION

Citation Formats

Ma, C. I., Chang, S. H., Liu, C. Y., Juang, J. M., Chang, C. H., and Tsang, K. L. The ACCM Beamlines For Bioscience Studies. United States: N. p., 2007. Web. doi:10.1063/1.2436188.
Ma, C. I., Chang, S. H., Liu, C. Y., Juang, J. M., Chang, C. H., & Tsang, K. L. The ACCM Beamlines For Bioscience Studies. United States. doi:10.1063/1.2436188.
Ma, C. I., Chang, S. H., Liu, C. Y., Juang, J. M., Chang, C. H., and Tsang, K. L. Fri . "The ACCM Beamlines For Bioscience Studies". United States. doi:10.1063/1.2436188.
@article{osti_21052645,
title = {The ACCM Beamlines For Bioscience Studies},
author = {Ma, C. I. and Chang, S. H. and Liu, C. Y. and Juang, J. M. and Chang, C. H. and Tsang, K. L.},
abstractNote = {To meet the increasing demand of X-ray beamlines for bioscience research, we have designed two high-performance, side-branch, asymmetric-cut curved crystal monochromator (ACCM) beamlines to fully utilize the sideway output of the superconducting wiggler SW6 at NSRRC. Each of these two beamlines (BL13A and BL13C) collects 1 mrad of the radiation fan in the horizontal direction, one centered at 3 mrad and the other at 4 mrad away from the central line of the wiggler output. The newly designed ACCMs are capable of energy scanning from 12 keV to 14 keV and offer good performances in terms of flux, resolution and stability. The ACCMs are designed and built in-house, combining efficient cooling and bending mechanisms in a compact unit that allows precise adjustments on a goniometer assembly. The bender is specially designed with symmetrically driven piezo-actuators that minimize center displacement during bending. Both direct and indirect cooling methods were tested; the former using Ga/In directly under the beam footprint and the latter using both sides of the crystal clamping area for cooling. Performance of the beamlines employing both cooling methods has been measured. The indirect cooling method provides 4.9 x 1010 photons/sec through a pair of 100 {mu}m slits (H x V) with energy resolution of 5.3 x 10-3 ({delta}E/E) at 12.7 keV. Higher energy resolution in the 10-4 range can be achieved by adjusting the horizontal source fan or the crystal radius at the expense of flux. The direct cooling method provides 1.4 x 1010 photons/sec through a pair of 100 {mu}m slits (H x V) with energy resolution of 1.2 x 10-3 ({delta}E/E) at 12.7 keV. The FWHM of the focused beam profile in the indirect cooling mode is 800 x 109 {mu}m (H x V), and 800 x 283 {mu}m (H x V) in the direct cooling mode with some horizontal tail, the latter being larger due to influence of the Ga/In layer on the crystal shape. Cooling efficiency is excellent in the direct cooling mode, in which the performance stabilizes in a few seconds after the photon shutter is opened, and in the indirect cooling mode the performance stabilizes in a few minutes. At present, both SW6 side-branch beamlines are ready for uses' bioscience research: BL13C for crystal screening, drug design, and high-resolution structural study, and BL13A for scattering experiments on biomaterials such as membranes.},
doi = {10.1063/1.2436188},
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}
}