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 ฮฆ [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 [ยตm] | > 50 | 30 - 1000 | 30 - 50 |
| Focal spot size [ยตm] | > 200 | 30 - 600 | 10 - 100 |
| Intensity gain | 500 - 4000 | 1500 - 20000 | 1000 - 7000 |
| Applications | XRF, XRD | ยตXRF, ยตXRD, ยตXPS and iMOXS-SEM | ยตXRF, ยตXRD and ยตXPS |
