Capillary-based x-ray collector/collimator for diffraction applications

Abstract

We describe and characterize a new x-ray optical system in which x rays are steered using multiple reflections within hollow glass capillary tubes. The prototype beam-shaping collector/collimator evaluated for diffraction with CuKα x rays in this letter has throughput of 6% and increases the useful x-ray flux by more than a factor of 4 above that of slit collimation with comparable divergence.

An energy dispersive micro X-ray diffractometer based on a combined system of polycapillary optics

“…The reason for this difference between the total resolutions is that the total resolution of a diffractometer is improved with the decrease of the divergence of the incident beam as shown in Eqs. (1) and (2).…”

“…A PPXRL can efficiently collect a relatively large solid angle of X-ray beams from an X-ray source and focus them to form a quasi-parallel beam for X-ray diffraction analysis [1][2][3][4][5][6][7]. The magnitude of the input focal spot size of a polycapillary X-ray lens is 10 lm and therefore, it is widely used in micro X-ray analysis [6][7][8][9][10][11][12][13][14].…”

Metal-coated capillary optics for soft x-ray

“…[1] A monocapillary is a single hollow tube which usually has a parabolic or elliptical shaped profile and mainly employed for x-ray microanalysis. [2,3] A polycapillary optic which is also called as a Kumakov lens consists of a number of glass tubes which are bundled together. [4] One or the both ends is tapered and it is usually used as a collimating or focusing optics.…”

Restricted Neutron Transmission through a Cylindrical Guide Tube

“…Polycapillary glass fibers, each with over a thousand narrow channels of size --~ 10 lam, may be used to control X-ray beams for diffraction, medical imaging and medical therapy. Furthermore, converging lenses using thousands of these polycapillary fibers have been used for producing a quasi-parallel X-ray beam for diffraction from a diverging source Kovantsev et al, 1993) and for focusing cold neutrons (Xiao et al, 1994) for materials analysis . The transmission characteristics of such polycapillary neutron lenses have been analysed previously (Mildner &Chen, 1994b).…”