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[ Identification | Description | Input parameters | Links ]
The Lens_simple Component
Simple refractive x-ray lens
Identification
- Site:
- Author: Erik Knudsen
- Origin: Risoe
- Date: June 16, 2009
Description
Models a stack of N refractive lenses, with a radius of curvature, r, at the apex. The model is a thin-lens approximation where photons are refracted in a the XY plane at Z=0. Absorption is generally disregarded may be handled through the use of the optional transmission parameter T, where 0<=T<=1. Thus, the lens has the focal length of f=R/(2*N*&delta) where the x-ray refractive index is written: n = 1 - &delta + i &beta. Example: Lens_simple(xwidth=1e-5, yheight=1e-5, material_datafile="Be.txt",N=100,r=0.3e-3)
Input parameters
Parameters in boldface are required; the others are optional.| Name | Unit | Description | Default | |
| xwidth | m | Width of lens aperture. | 0 | |
| yheight | m | Height of lens aperture. | 0 | |
| radius | m | Radius of lens aperture (overrides xwidth & yheight). | 1e-3 | |
| T | 0-1 | Transmission efficiency of the lens. | 1 | |
| r | m | The radius of curvature of the lens. | 3e-4 | |
| N | 1 | The number of successive lenses in the stack. | 1 | |
| verbose | 0/1 | Extra information for debugging. | 0 | |
| f | m | Focal length - overrides the material_datafile - and diregards chromatic aberration. | 0 | |
| material_datafile | File where the material parameters for the lens may be found. Format is similar to what may be found off the NIST website. | "Be.txt" |
| AT ( | , | , | ) RELATIVE | |||
|---|---|---|---|---|---|---|
| ROTATED ( | , | , | ) RELATIVE |
Links
- Source code for
Lens_simple.comp. - material datafile obtained from http://physics.nist.gov/cgi-bin/ffast/ffast.pl
[ Identification | Description | Input parameters | Links ]
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