Abstract
We present a new planar Ni compound refractive lens for high energy X-rays (116 keV). The lens is composed of identical plano-concave elements with longitudinal parabolic grooves manufactured by a punch technique. In order to increase the lens transmission, the thickness of the single lens at the parabolic groove vertex was reduced to less than 5 μm and the radius of curvature was reduced to about 20 μm. The small radius of curvature allowed us to reduce the number of single elements needed to get the focal length of 3 m to 54 single lenses. The gain parameter has been significantly improved compared to the previous lenses due to higher transmission, but the focused beam size and its gain are not as good as expected, mostly due to the aberrations caused by the lens shape imperfections.
Highlights
The CRL is the assembly of a number of single lenses
We present a new planar Ni compound refractive lens for high energy X-rays (116 keV)
The lens is composed of identical plano-concave elements with longitudinal parabolic grooves manufactured by a punch technique
Summary
The CRL is the assembly of a number (even several hundred) of single lenses (plano or double concave). Our previous Ni compound refractive lenses tested at the BL08W beamline at SPring-8 were designed for magnetic Compton scattering experiments with the use of circularly polarized X-ray beam of energy 175 keV.. Our previous Ni compound refractive lenses tested at the BL08W beamline at SPring-8 were designed for magnetic Compton scattering experiments with the use of circularly polarized X-ray beam of energy 175 keV.11,12 They were made of 600 single concave lenses with a 100 μm radius of curvature. At the parabola vertex and a final focal length of 2.6–2.7 m With these lenses we have achieved the image size of 5 μm with an intensity gain of around 4. In order to increase the lens transmission, the number of single profiles (N) in our project has been limited to 54 by reducing the radius of curvature at the parabolic groove vertex (R) to 20 μm (see Fig. 1(a)).
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