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STUDY RESULTS FROM YEREVAN STATE UNIVERSITY BROADEN UNDERSTANDING OF ELECTROMAGNETIC RESEARCH
Journal of Technology & Science
May 30, 2010
According to recent research published in the Journal of
Synchrotron Radiation, "An X-ray one-dimensionally focusing
system, a refracting-diffracting lens (RDL), composed of Bragg
double-asymmetric-reflecting two-crystal plane parallel plates and a
double-concave cylindrical parabolic lens placed in the gap between
the plates is described. It is shown that the focal length of the
RDL is equal to the focal distance of the separate lens multiplied
by the square of the asymmetry factor."
"One can obtain RDLs with different focal lengths for certain
applications. Using the point-source function of dynamic diffraction,
as well as the Green function in a vacuum with parabolic approximation,
an expression for the double-diffracted beam amplitude for an arbitrary
incident wave is presented. Focusing of the plane incident wave and
imaging of a point source are studied. The cases of non-absorptive
and absorptive lenses are discussed. The intensity distribution
in the focusing plane and on the focusing line, and its dependence
on wavelength, deviation from the Bragg angle and magnification is
studied. Geometrical optical considerations are also given. RDLs can be
applied to focus radiation from both laboratory and synchrotron X-ray
sources, for X-ray imaging of objects, and for obtaining high-intensity
beams," wrote A.H. Grigoryan and colleagues, Yerevan State University.
The researchers concluded: "RDLs can also be applied in X-ray
astronomy."
Grigoryan and colleagues published their study in the Journal of
Synchrotron Radiation (X-ray focusing by the system of refractive
lens(Es) placed inside asymmetric channel-cut crystals. Journal of
Synchrotron Radiation, 2010;17(Part 3):332-347).
For additional information, contact M.K. Balyan, Yerevan State
University, Solid State Physics Research Laboratory, Dept. of Solid
State Physics, Faculty Physics, Yerevan, Armenia.
The publisher's contact information for the Journal of Synchrotron
Radiation is: Wiley-Blackwell Publishing, Inc., Commerce Place,
350 Main St., Malden 02148, MA, USA.
From: A. Papazian
Journal of Technology & Science
May 30, 2010
According to recent research published in the Journal of
Synchrotron Radiation, "An X-ray one-dimensionally focusing
system, a refracting-diffracting lens (RDL), composed of Bragg
double-asymmetric-reflecting two-crystal plane parallel plates and a
double-concave cylindrical parabolic lens placed in the gap between
the plates is described. It is shown that the focal length of the
RDL is equal to the focal distance of the separate lens multiplied
by the square of the asymmetry factor."
"One can obtain RDLs with different focal lengths for certain
applications. Using the point-source function of dynamic diffraction,
as well as the Green function in a vacuum with parabolic approximation,
an expression for the double-diffracted beam amplitude for an arbitrary
incident wave is presented. Focusing of the plane incident wave and
imaging of a point source are studied. The cases of non-absorptive
and absorptive lenses are discussed. The intensity distribution
in the focusing plane and on the focusing line, and its dependence
on wavelength, deviation from the Bragg angle and magnification is
studied. Geometrical optical considerations are also given. RDLs can be
applied to focus radiation from both laboratory and synchrotron X-ray
sources, for X-ray imaging of objects, and for obtaining high-intensity
beams," wrote A.H. Grigoryan and colleagues, Yerevan State University.
The researchers concluded: "RDLs can also be applied in X-ray
astronomy."
Grigoryan and colleagues published their study in the Journal of
Synchrotron Radiation (X-ray focusing by the system of refractive
lens(Es) placed inside asymmetric channel-cut crystals. Journal of
Synchrotron Radiation, 2010;17(Part 3):332-347).
For additional information, contact M.K. Balyan, Yerevan State
University, Solid State Physics Research Laboratory, Dept. of Solid
State Physics, Faculty Physics, Yerevan, Armenia.
The publisher's contact information for the Journal of Synchrotron
Radiation is: Wiley-Blackwell Publishing, Inc., Commerce Place,
350 Main St., Malden 02148, MA, USA.
From: A. Papazian