High-brightness beamline for x-ray spectroscopy at the advanced light source

Journal Article · Wed Feb 01 04:00:00 EST 1995 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1145837· OSTI ID:6597318

Perera, R C.C.; Jones, G ^[1]; Lindle, D W ^[2]

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1. Advanced Light Source, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
2. Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003 (United States)

Beamline 9.3.1 at the Advanced Light Source (ALS) is a windowless beamline, covering the 1--6 keV photon-energy range, designed to achieve the goals of high energy resolution, high flux, and high brightness at the sample. When completed later this year, it will be the first ALS monochromatic hard-x-ray beamline, and its brightness will be an order-of-magnitude higher than presently available in this energy range. In addition, it will provide flux and resolution comparable to any other beamline now in operation. To achieve these goals, two technical improvements, relative to existing x-ray beamlines, were incorporated. First, a somewhat novel optical design for x rays, in which matched toroidal mirrors are positioned before and after the double-crystal monochromator, was adopted. This configuration allows for high resolution by passing a collimated beam through the monochromator, and for high brightness by focusing the ALS source on the sample with unit magnification. Second, a new Cowan type'' double-crystal monochromator based on the design used at NSLS beamline X-24A was developed. The measured mechanical precision of this new monochromator shows significant improvement over existing designs, without using positional feedback available with piezoelectric devices. Such precision is essential because of the high brightness of the radiation and the long distance (12 m) from the source (sample) to the collimating (focusing) mirror. This combination of features will provide a bright, high resolution, and stable x-ray beam for use in the x-ray spectroscopy program at the ALS.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6597318
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 66:2; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

440600* -- Optical Instrumentation-- (1990-)
47 OTHER INSTRUMENTATION
ADVANCED LIGHT SOURCE
BEAM OPTICS
BRIGHTNESS
ENERGY RESOLUTION
MONOCHROMATORS
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
RADIATION SOURCES
RESOLUTION
SPECTROSCOPY
SYNCHROTRON RADIATION SOURCES
X-RAY SPECTROSCOPY