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

The Source_flux_lambda component

Neutron source with flat wavelength spectrum and user-specified flux.

Identification

• Author: KN
• Origin: McStas release
• Date: 1998
• Version: 1.3
• Modification history:
  • KN, 1998 from Source_flat.comp

Description

The routine is a circular neutron source, which aims at a square target
centered at the beam (in order to improve MC-acceptance rate).  The angular
divergence is then given by the dimensions of the target. The neutron
wavelength is uniformly distrubuted between lambda_0 - d_lambda and
lambda_0 + d_lambda. The source flux is specified in neutrons per steradian
per square cm per AAngstroem.

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
radius	m	Radius of circle in (x,y,0) plane where neutrons are generated.
dist	m	Distance to target along z axis.
xw	m	Width(x) of target
yh	m	Height(y) of target
lambda_0	AA	Mean wavelength of neutrons.
d_lambda	AA	Wavelength spread of neutrons.
flux	1/(cm**2*st*AA)	Source flux

Output parameters

Name	Unit	Description	Default
hdiv
vdiv
p_in

Links

• Source code for Source_flux_lambda.comp.

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

Generated automatically by McDoc, Kristian Nielsen <kristian.nielsen@risoe.dk> / Jan 22 2001

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Last Modified: Tuesday, 22-Jun-2004 14:04:09 CEST