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This type of polycapillary optics enables focussing of X-radiation. According to application particular parameters of the optics can be optimised. It is possible to reach small spot sizes or high intensities on the sample surface. An increase of the working distance between optics exit and the sample surface leads to larger spot sizes.

Specification

Focussing polycapillary system for XRF and XPS applications

Polycapillary large lens Polycapillary mini lens Polycapillary micro lens  
Source - entrance distance f1 [mm] > 40 > 40 > 30
Length L [mm] 150 - 300 50 - 300 40 - 60
Exit - focus distance f2 [mm] > 40 > 10 5 - 25
Entrance size Din [mm] > 5 > 4 > 2
Maximal size Dmax [mm] < 16 7 - 9 4 - 5
Exit size Dout [mm] > 5 > 2 > 1
Capture angle Φ [rad] 0.05 - 0.2 0.04 - 0.15 0.05 - 0.1
Energy range [keV] 1 - 30 3 - 30 3 - 30
Optimal source size [µm] > 50 30 - 1000 30 - 50
Focal spot size [µm] > 200 30 - 600 10 - 100
Intensity gain 500 - 4000 1500 - 20000 1000 - 7000
Applications XRF, XRD µXRF, µXRD, µXPS and iMOXS-SEM µXRF, µXRD and µXPS
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