Skip to main content
OSTI.GOVU.S. Department of Energy Office of Scientific and Technical Information
U.S. Department of Energy
Office of Scientific and Technical Information
 

Performance optimization of a bendable parabolic cylinder collimating X-ray mirror for the ALS micro-XAS beamline 10.3.2

Journal Article · · Journal of Synchrotron Radiation (Online)
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
+ Show Author Affiliations
The Advanced Light Source (ALS) beamline (BL) 10.3.2 is an apparatus for X-ray microprobe spectroscopy and diffraction experiments, operating in the energy range 2.4–17 keV. The performance of the beamline, namely the spatial and energy resolutions of the measurements, depends significantly on the collimation quality of light incident on the monochromator. In the BL 10.3.2 end-station, the synchrotron source is imaged 1:1 onto a set of roll slits which form a virtual source. The light from this source is collimated in the vertical direction by a bendable parabolic cylinder mirror. Details are presented of the mirror design, which allows for precision assembly, alignment and shaping of the mirror, as well as for extending of the mirror operating lifetime by a factor of ~10. Assembly, mirror optimal shaping and preliminary alignment were performed ex situ in the ALS X-ray Optics Laboratory (XROL). Using an original method for optimal ex situ characterization and setting of bendable X-ray optics developed at the XROL, a root-mean-square (RMS) residual surface slope error of 0.31 µrad with respect to the desired parabola, and an RMS residual height error of less than 3 nm were achieved. Once in place at the beamline, deviations from the designed optical geometry (e.g. due to the tolerances for setting the distance to the virtual source, the grazing incidence angle, the transverse position) and/or mirror shape (e.g. due to a heat load deformation) may appear. Due to the errors, on installation the energy spread from the monochromator is typically a few electron-volts. Here, a new technique developed and successfully implemented for at-wavelength (in situ) fine optimal tuning of the mirror, enabling us to reduce the collimation-induced energy spread to ~0.05 eV, is described.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1213436
Alternate ID(s):
OSTI ID: 1512145
OSTI ID: 22437367
Journal Information:
Journal of Synchrotron Radiation (Online), Journal Name: Journal of Synchrotron Radiation (Online) Journal Issue: 3 Vol. 22; ISSN 1600-5775; ISSN JSYRES
Publisher:
International Union of CrystallographyCopyright Statement
Country of Publication:
United States
Language:
English

References (28)

Development of in situ, at-wavelength metrology for soft X-ray nano-focusing
  • Yuan, Sheng; Yashchuk, Valeriy V.; Goldberg, Kenneth A.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 649, Issue 1 https://doi.org/10.1016/j.nima.2010.10.134
journal September 2011
In situ fine tuning of bendable soft x-ray mirrors using a lateral shearing interferometer
  • Merthe, Daniel J.; Goldberg, Kenneth A.; Yashchuk, Valeriy V.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 710 https://doi.org/10.1016/j.nima.2012.10.105
journal May 2013
A dedicated superbend x-ray microdiffraction beamline for materials, geo-, and environmental sciences at the advanced light source journal March 2009
Optimal measurement strategies for effective suppression of drift errors journal November 2009
Metrology for the Advancement of X-ray Optics at the ALS journal September 2013
A Precision Grazing-incidence Angle Error Measurement of a Hard X-ray Condenser Mirror Using Single-grating Interferometry journal September 2013
At-wavelength Metrology of X-ray Optics at Diamond Light Source journal September 2013
Ex- and In-situ Metrology Based on the Shack-Hartmann Technique for Sub-nanometric Metrology journal September 2013
Experimental methods for optimal tuning of bendable mirrors for diffraction-limited soft x-ray focusing journal March 2013
Bendable Kirkpatrick-Baez mirrors for the ALS micro-diffraction beamline 12.3.2: optimal tuning and alignment for multiple focusing geometries journal March 2013
Beamline 10.3.2 at ALS: a hard X-ray microprobe for environmental and materials sciences journal April 2004
Optimal tuning and calibration of bendable mirrors with slope-measuring profilers journal August 2009
Methodology for optimal in situ alignment and setting of bendable optics for nearly diffraction-limited focusing of soft x-rays journal March 2013
Correlation analysis of surface slope metrology measurements of high quality x-ray optics conference September 2013
Incoherent x-ray mirror surface metrology conference November 1997
Design, analysis, and performance of an epoxy-bonded bendable mirror
  • Hartman, Neal D.; Heimann, Philip A.; MacDowell, Alastair A.
  • SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, SPIE Proceedings https://doi.org/10.1117/12.331128
conference November 1998
Air convection noise of pencil-beam interferometer for long trace profiler conference August 2006
Performance of the upgraded LTP-II at the ALS Optical Metrology Laboratory conference August 2008
At-wavelength optical metrology development at the ALS conference August 2010
Studies in optimal configuration of the LTP conference August 2010
Automated suppression of errors in LTP-II slope measurements with x-ray optics conference September 2011
An experimental apparatus for diffraction-limited soft x-ray nano-focusing conference September 2011
Design optimization of bendable x-ray mirrors conference September 2011
Ex situ tuning of bendable x-ray mirrors for optimal beamline performance conference October 2012
Cross comparison of surface slope and height optical metrology with a super-polished plane Si mirror conference October 2012
Elliptically Bent X-Ray Mirrors with Active Temperature Stabilization journal January 2010
Formation of Optical Images by X-Rays journal January 1948
Reconstruction of an astigmatic hard X-ray beam and alignment of K-B mirrors from ptychographic coherent diffraction data journal January 2010

Cited By (1)

A micro-focusing and high-flux-throughput beamline design using a bending magnet for microscopic XAFS at the High Energy Photon Source journal July 2019

Figures / Tables (8)

Figure 1(p. 2)figure Figure 1
Figure 2(p. 2)figure Figure 2
Figure 3(p. 3)figure Figure 3
Figure 4(p. 4)figure Figure 4
Figure 5(p. 5)figure Figure 5
Figure 6(p. 5)figure Figure 6
Figure 7(p. 7)figure Figure 7
Figure 8(p. 7)figure Figure 8

Similar Records

Related Subjects

43 PARTICLE ACCELERATORS
X-ray mirrors
at-wavelength metrology
bendable mirrors
optimal surface shaping