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Title: Fabrication of nested elliptical KB mirrors using profile coating for synchrotron radiation X-ray focusing

Abstract

This paper describes fabrication methods used to demonstrate the advantages of nested or Montel optics for micro/nanofocusing of synchrotron X-ray beams. A standard Kirkpatrick-Baez (KB) mirror system uses two separated elliptical mirrors at glancing angles to the X-ray beam and sequentially arranged at 90{sup o} to each other to focus X-rays successively in the vertical and horizontal directions. A nested KB mirror system has the two mirrors positioned perpendicular and side-by-side to each other. Compared to a standard KB mirror system, Montel optics can focus a larger divergence and the mirrors can have a shorter focal length. As a result, nested mirrors can be fabricated with improved demagnification factor and ultimately smaller focal spot, than with a standard KB arrangement. The nested system is also more compact with an increased working distance, and is more stable, with reduced complexity of mirror stages. However, although Montel optics is commercially available for laboratory X-ray sources, due to technical difficulties they have not been used to microfocus synchrotron radiation X-rays, where ultra-precise mirror surfaces are essential. The main challenge in adapting nested optics for synchrotron microfocusing is to fabricate mirrors with a precise elliptical surface profile at the very edge where the twomore » mirrors meet and where X-rays scatter. For example, in our application to achieve a sub-micron focus with high efficiency, a surface figure root-mean-square (rms) error on the order of 1 nm is required in the useable area along the X-ray footprint with a {approx} 0.1 mm-diameter cross section. In this paper we describe promising ways to fabricate precise nested KB mirrors using our profile coating technique and inexpensive flat Si substrates.« less

Authors:
 [1];  [2];  [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Argonne National Laboratory (ANL)
  2. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1039642
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Applied Surface Science
Additional Journal Information:
Journal Volume: 258; Journal Issue: 6; Journal ID: ISSN 0169-4332
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; COATINGS; CROSS SECTIONS; DEPOSITION; EFFICIENCY; FABRICATION; FOCUSING; MIRRORS; OPTICS; SUBSTRATES; SYNCHROTRON RADIATION; SYNCHROTRONS; X-RAY SOURCES

Citation Formats

Liu, Chian, Ice, Gene E, Liu, Wenjun, Assoufid, Lahsen, Qian, J, Shi, B., Khachatryan, Ruben, Wieczorek, M., Zschack, P., and Tischler, Jonathan Zachary. Fabrication of nested elliptical KB mirrors using profile coating for synchrotron radiation X-ray focusing. United States: N. p., 2012. Web. doi:10.1016/j.apsusc.2011.02.079.
Liu, Chian, Ice, Gene E, Liu, Wenjun, Assoufid, Lahsen, Qian, J, Shi, B., Khachatryan, Ruben, Wieczorek, M., Zschack, P., & Tischler, Jonathan Zachary. Fabrication of nested elliptical KB mirrors using profile coating for synchrotron radiation X-ray focusing. United States. https://doi.org/10.1016/j.apsusc.2011.02.079
Liu, Chian, Ice, Gene E, Liu, Wenjun, Assoufid, Lahsen, Qian, J, Shi, B., Khachatryan, Ruben, Wieczorek, M., Zschack, P., and Tischler, Jonathan Zachary. Sun . "Fabrication of nested elliptical KB mirrors using profile coating for synchrotron radiation X-ray focusing". United States. https://doi.org/10.1016/j.apsusc.2011.02.079.
@article{osti_1039642,
title = {Fabrication of nested elliptical KB mirrors using profile coating for synchrotron radiation X-ray focusing},
author = {Liu, Chian and Ice, Gene E and Liu, Wenjun and Assoufid, Lahsen and Qian, J and Shi, B. and Khachatryan, Ruben and Wieczorek, M. and Zschack, P. and Tischler, Jonathan Zachary},
abstractNote = {This paper describes fabrication methods used to demonstrate the advantages of nested or Montel optics for micro/nanofocusing of synchrotron X-ray beams. A standard Kirkpatrick-Baez (KB) mirror system uses two separated elliptical mirrors at glancing angles to the X-ray beam and sequentially arranged at 90{sup o} to each other to focus X-rays successively in the vertical and horizontal directions. A nested KB mirror system has the two mirrors positioned perpendicular and side-by-side to each other. Compared to a standard KB mirror system, Montel optics can focus a larger divergence and the mirrors can have a shorter focal length. As a result, nested mirrors can be fabricated with improved demagnification factor and ultimately smaller focal spot, than with a standard KB arrangement. The nested system is also more compact with an increased working distance, and is more stable, with reduced complexity of mirror stages. However, although Montel optics is commercially available for laboratory X-ray sources, due to technical difficulties they have not been used to microfocus synchrotron radiation X-rays, where ultra-precise mirror surfaces are essential. The main challenge in adapting nested optics for synchrotron microfocusing is to fabricate mirrors with a precise elliptical surface profile at the very edge where the two mirrors meet and where X-rays scatter. For example, in our application to achieve a sub-micron focus with high efficiency, a surface figure root-mean-square (rms) error on the order of 1 nm is required in the useable area along the X-ray footprint with a {approx} 0.1 mm-diameter cross section. In this paper we describe promising ways to fabricate precise nested KB mirrors using our profile coating technique and inexpensive flat Si substrates.},
doi = {10.1016/j.apsusc.2011.02.079},
url = {https://www.osti.gov/biblio/1039642}, journal = {Applied Surface Science},
issn = {0169-4332},
number = 6,
volume = 258,
place = {United States},
year = {2012},
month = {1}
}