McXtrace - An X-ray ray-trace simulation package

[ Identification | Description | Input parameters | Links ]

The ZonePlate Component

Zone plate based on Monte Carlo sampling of the Fresnel-Kirchhoff integral

Identification

• Site:
• Author: Erik B Knudsen
• Origin: DTU Physics
• Date: June 16, 2009

Description

A component which models a zone plate by consierding the plate a secondary source
and then by means of Monte Carlo sampling, evaluating the Fresnel-Kirchhoff integral
implicitly by resampling the beam in a window defined by the focus_xw,focus_yh parameters.

Caveat emptor I: this is a computationally heavy component to run.
Caveat emptor II: for correct modelling of phase-interference phenomena, detectors used after the ZonePlate
should be of the "PSD_monitor_coh" type.

The zone plate can be either circular or linear. In the linear case, the "slits" are
along the x-axis.

Example: ZonePlate(radius=0.00015, L=0.15, lambda0=1, focus_xw=300e-9, focus_yh = 300e-9, focus_x0 = 0.0, focus_y0 = 0.0, dist=1)

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
radius	m	The outer radius of the zone plate. Triggers a circular zone plate. Takes precedence over xwidth,yheight.	0
xwidth	m	Width of linear zone plate.	0
yheight	m	Height of linear zone plate	0
L	m	Focal length.
lambda0	AA	The nominal wavelength that the zone plate is designed to focus.
focus_x0	m	Offset of resampling window along the x-axis.	0
focus_y0	m	Offset of resampling window along the y-axis.	0
focus_xw	m	Width of the resampling window.
focus_yh	m	Height of the resampling window.
dist	m	Distance along the z-axis from zone plate to the resampling window.

AT (	,	,		) RELATIVE		Generate
ROTATED (	,	,		) RELATIVE

Links

• Source code for ZonePlate.comp.

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[ Identification | Description | Input parameters | Links ]

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Last Modified: Sunday, 06-Apr-2025 20:25:04 CEST