McXtrace - An X-ray ray-trace simulation package

[ Identification | Description | Input parameters | Links ]

The Chopper_simple Component

Ideal chopper

Identification

• Site:
• Author:
• Origin: Risoe
• Date: August 2011

Description

Ideal model of a chopper situated at Z=0. If a photon arrives at the chopper plane
at a time of t = [t0 +-n*T: t0 +-n*T +tau], where T is the period of the chopper, t0 the initial delay
and tau the opening time of the chopper, it is left untouched - otherwise it is ABSORBed.
If on a continous source the isfirst parameter may be used. In this case the photon time is _defined_
by the chopper. In other words no photons are absorbed, the photon time is merely sampled within the chopper window.
t_rise is the rise-time of the chopper opening giving a trapezoidal shape.
Limitations: this component does not take chopper geometry into account. If isfirst only samples in the first chopper opening window.

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
t0	s	Initial delay of the opening time	0
T	s	Period of the chopper	1
tau	s	Opening time of the chopper	0.1
xwidth	m	height of the chopper opening	0.1
yheight	m	width of the chopeper opening	0.1
isfirst		is the chopper the first chopper on a continous source.	0
t_rise	s	Rise time of the chopper pulse.	0
tjit		Timing jitter in terms of the opening time tau. For each ray the opening window will be shifted by a random amount within t=[-tjit*.5*tau,tjit*.5*tau]	0

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

Links

• Source code for Chopper_simple.comp.

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[ Identification | Description | Input parameters | Links ]

Generated on 2025-03-31 19:18:19

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Last Modified: Tuesday, 17-Jun-2025 20:12:03 CEST