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McXtrace - An X-ray ray-trace simulation package

ESRF; SAXSLAB Niels Bohr Institute DTU Physics



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McXtrace: DivPos_monitor Component

[ Identification | Description | Input parameters | Output parameters | Links ]

The DivPos_monitor Component

Based on neutron component by Kim Lefmann Divergence/position monitor (acceptance diagram).


  • Author: Erik B Knudsen
  • Origin: DTU Physics
  • Date: Jun. 16
  • Version: $Revision$


2D detector for intensity as a function of both horizontal position
and wavelength. This gives information similar to an aceptance diagram used
eg. to investigate beam profiles in neutron guides.

Example: DivPos_monitor(nh=20, ndiv=20, filename="Output.dip",
          xmin=-0.1, xmax=0.1, ymin=-0.1, ymax=0.1, maxdiv_h=2)

Input parameters

Parameters in boldface are required; the others are optional.
Name Unit Description Default
nh 1 Number of bins in position. 20
ndiv 1 Number of bins in divergence. 20
filename Name of file in which to store the detector image. 0
xmin m Lower x bound of detector opening. -0.05
xmax m Upper x bound of detector opening. 0.05
ymin m Lower y bound of detector opening. -0.05
ymax m Upper y bound of detector opening. 0.05
xwidth m Width of detector. Overrides xmin,xmax. 0
yheight m Height of detector. Overrides ymin,ymax. 0
maxdiv_h deg. Maximal horizontal divergence detected. 2
restore_xray 1 If set, the monitor does not influence the photon state. 0
nx 0
ny 1 Vector definition of "forward" direction wrt. divergence, to be used e.g. when the monitor is rotated into the horizontal plane. 0
nz 1
nowritefile 1 If set, monitor will skip writing to disk. 0

Output parameters

Name Unit Description Default
Div_N - Array of photon ray counts  
Div_p - Array of photon weight counts  
Div_p2 - Array of second moments  


[ Identification | Description | Input parameters | Output parameters | Links ]

Generated automatically by McDoc, Peter Willendrup <> / Mon Aug 16 15:54:47 2021

Last Modified: Monday, 16-Aug-2021 17:54:47 CEST
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