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Issue 5, 2009
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Performance of a polycapillary halflens as focussing and collecting optic—a comparison

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Abstract

Polycapillary halflenses are widely used to focus X-ray radiation onto a small spot. Additionally they can reduce the field of view of a semiconductor detector when placed in front of one. In 3D micro X-ray fluorescence spectroscopy (3D Micro-XRF) with synchrotron radiation, two polycapillary halflenses are used in a confocal geometry. Up until now, characterization measurements in the focal plane have only been performed in the case of the lens focusing parallel radiation. Assumptions have been made, that in the other case, when isotropic radiation from a spot source is transported to a detector, the acceptance distribution in the focal plane is also Gaussian. We performed measurements with an electron beam as well as a proton beam which confirm this assumption. In addition, a comparison between measurements in collecting and focusing mode show differences in spot size and transmission. These differences exemplify the fact that there is not one global spot size or transmission function of a polycapillary halflens. Illumination and divergence effects can alter both characteristic lens parameters.

Graphical abstract: Performance of a polycapillary halflens as focussing and collecting optic—a comparison

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Publication details

The article was received on 13 Oct 2008, accepted on 03 Feb 2009 and first published on 27 Feb 2009


Article type: Paper
DOI: 10.1039/B817828C
Citation: J. Anal. At. Spectrom., 2009,24, 669-675
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    Performance of a polycapillary halflens as focussing and collecting optic—a comparison

    T. Wolff, I. Mantouvalou, W. Malzer, J. Nissen, D. Berger, I. Zizak, D. Sokaras, A. Karydas, N. Grlj, P. Pelicon, R. Schütz, M. Žitnik and B. Kanngießer, J. Anal. At. Spectrom., 2009, 24, 669
    DOI: 10.1039/B817828C

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