About McStas Download Documentation 
[ Identification  Description  Input parameters  Output parameters  Links ] The
Neutron source with Gaussian or uniform divergence

Name  Unit  Description  Default 

xwidth  m  Width of source  
yheight  m  Height of source  
focus_aw  deg  FWHM (Gaussian) or maximal (uniform) horz. width divergence  
focus_ah  deg  FWHM (Gaussian) or maximal (uniform) vert. height divergence  
E0  meV  Mean energy of neutrons.  0.0 
dE  meV  Energy half spread of neutrons.  0.0 
lambda0  only relevant for E0=0  [Ang] Mean wavelength of neutrons  0.0 
dlambda  Ang  Wavelength half spread of neutrons.  0.0 
gauss  01  Criterion: 0: uniform, 1: Gaussian distributions  0 
flux  1/(s cm 2 st energy_unit)  flux per energy unit, Angs or meV  1 
Name  Unit  Description  Default 

thetah  
thetav  
sigmah  rad  parameter 'sigma' of the Gaussian distribution for horizontal divergence  
sigmav  rad  parameter 'sigma' of the Gaussian distribution for vertical divergence  
tan_h  
tan_v  
p_init  1  normalisation factor 1/'neutron_count'  
dist  
focus_xw  
focus_yh 
Source_div.comp
.
[ Identification  Description  Input parameters  Output parameters  Links ]
Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Wed Jan 12 15:13:31 2022