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Title: Beamline Design for a BioNanoprobe: Stability and Coherence

Abstract

For scanning x-ray microprobes, the angle of the incident beam is required to be stable to better than one microradian during the course of an experiment. This is a very stringent requirement, even more so for micro-XAS measurements when the monochromator energy has to be scanned over hundreds of eV. At the same time, the horizontal emittance of the electron source at most synchrotron facilities is much too large to provide coherent illumination of the microfocusing optics. A beamline design is proposed here that makes use of the large horizontal emittance to provide a very stable beam for the operation of a BioNanoprobe, while also increases the coherence to ensure diffraction-limited resolution in the horizontal direction.

Authors:
; ;  [1]
  1. Advanced Photon Source, Argonne National Laboratory, 9700 S. Cass Ave., Argonne, IL 60439 (United States)
Publication Date:
OSTI Identifier:
21049266
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: 10.1063/1.2436305; (c) 2007 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ABSORPTION SPECTROSCOPY; DESIGN; ELECTRON SOURCES; EV RANGE; MICROSCOPY; MONOCHROMATORS; NANOSTRUCTURES; OPTICS; RESOLUTION; STABILITY; SYNCHROTRON RADIATION; SYNCHROTRONS; X RADIATION; X-RAY DIFFRACTION; X-RAY SPECTROSCOPY

Citation Formats

Lai, B., Vogt, S., and Maser, J. Beamline Design for a BioNanoprobe: Stability and Coherence. United States: N. p., 2007. Web. doi:10.1063/1.2436305.
Lai, B., Vogt, S., & Maser, J. Beamline Design for a BioNanoprobe: Stability and Coherence. United States. doi:10.1063/1.2436305.
Lai, B., Vogt, S., and Maser, J. Fri . "Beamline Design for a BioNanoprobe: Stability and Coherence". United States. doi:10.1063/1.2436305.
@article{osti_21049266,
title = {Beamline Design for a BioNanoprobe: Stability and Coherence},
author = {Lai, B. and Vogt, S. and Maser, J.},
abstractNote = {For scanning x-ray microprobes, the angle of the incident beam is required to be stable to better than one microradian during the course of an experiment. This is a very stringent requirement, even more so for micro-XAS measurements when the monochromator energy has to be scanned over hundreds of eV. At the same time, the horizontal emittance of the electron source at most synchrotron facilities is much too large to provide coherent illumination of the microfocusing optics. A beamline design is proposed here that makes use of the large horizontal emittance to provide a very stable beam for the operation of a BioNanoprobe, while also increases the coherence to ensure diffraction-limited resolution in the horizontal direction.},
doi = {10.1063/1.2436305},
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}
}
  • For scanning x-ray microprobes, the angle of the incident beam is required to be stable to better than one microradian during the course of an experiment. This is a very stringent requirement, even more so for micro-XAS measurements when the monochromator energy has to be scanned over hundreds of eV. At the same time, the horizontal emittance of the electron source at most synchrotron facilities is much too large to provide coherent illumination of the microfocusing optics. A beamline design is proposed here that makes use of the large horizontal emittance to provide a very stable beam for the operationmore » of a BioNanoprobe, while also increases the coherence to ensure diffraction-limited resolution in the horizontal direction.« less
  • A dedicated insertion-device beamline has been designed and is being constructed at the Advanced Photon Source (APS) for development of x-ray microfocusing- and coherence-based techniques and applications. Important parameters considered in this design include preservation of source brilliance and coherence, selectable transverse coherence length and energy bandwidth, high beam angular stability, high order harmonic suppression, quick x-ray energy scan, and accurate and stable x-ray energy. The overall design of this beamline layout and the major beamline components are described. The use of a horizontally deflecting mirror as the first optical component is one of the main features of this beamlinemore » design, and the resulting advantages are briefly discussed. {copyright} {ital 1996 American Institute of Physics.}« less
  • I13L is a 250 m long beamline for imaging and coherent diffraction currently under construction at the Diamond Light Source. For modeling the beamline optics the phase-space based ray-tracing code XPHASY was developed, as general ray-tracing codes for x-rays do not easily allow studying the propagation of coherence along the beamline. In contrast to computational intensive wave-front propagation codes, which fully describe the propagation of a photon-beam along a beamline but obscure the impact of individual optical components onto the beamline performance, this code allows to quickly calculate the photon-beam propagation along the beamline and estimate the impact of individualmore » components.In this paper we will discuss the optical design of the I13L coherence branch from the perspective of phase-space by using XPHASY. We will demonstrate how the phase-space representation of a photon-beam allows estimating the coherence length at any given position along the beamline. The impact of optical components on the coherence length and the effect of vibrations on the beamline performance will be discussed. The paper will demonstrate how the phase-space representation of photon-beams allows a more detailed insight into the optical performance of a coherence beamline than ray-tracing in real space.« less
  • The third-generation Advanced Photon Source will open up dramatic new opportunities for experiments requiring coherent x-rays, such as scanning x-ray microscopy, interferometry, and coherent scattering. We are building a beamline at the Advanced Photon Source to exploit the potential of coherent x-ray applications in the 1{endash}4 keV energy region. A high brightness 5.5-cm-period undulator supplies the coherent x-rays. The beamline uses horizontally deflecting grazing-incidence optical elements to preserve the coherence of the undulator beam. The optics have multilayer coatings for operation at energies above 1.5 keV. This paper discusses the beamline design and its expected performance. {copyright} {ital 1996 Americanmore » Institute of Physics.}« less
  • I13L is the first long beamline at Diamond dedicated to imaging and coherence. Two independent branches will operate in the energy range of 6-30 keV with spatial resolution on the micro- to nano-lengthscale. The Imaging branch is dedicated to imaging and tomography with In-line phase contrast and full-field microscopy on the micron to nano-length scale. Ultimate resolution will be achieved on the Coherence branch at I13L with imaging techniques in the reciprocal space. The experimental stations will be located about 250 m from the source, taking advantage of the coherence properties of the source. The beamline has some outstanding featuresmore » such as the mini-beta layout of the storage ring's straight section. The optical layout is optimized for beam stability and high optical quality to preserve the coherent radiation. In the experimental stations several methods will be available, starting for the first user with in-line phase contrast imaging on the imaging branch and Coherent X-ray Diffraction (CXRD) on the coherence branch.« less