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

The Convert_FlatE_2_Maxwell component

Conversion from flat energy distribution to Maxwellian neutron spectra

Identification

• Author: Thomas C Hansen
• Origin: ILL (Dif/D20)
• Date: 07 March 2000
• Version: 1.0

Description

The routine modifies/converts the incident flat (in energy) neutron spectra, 
as it comes out from a source like the standard adaptive source 
Source_adapt, 
to obtain a Maxwellian neutron distribution, as it is approximatively the case for thermal neutrons
in a reactor's moderator (e.g. the HFR of the ILL in Grenoble). So, this 
component is only a virtual one, not corresponding to a real element in a
neutron beam.

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
T	K	The temperature of the source, 293 K for thermal neutrons (beam tube H11 at ILL)
E0	meV	Mean energy of neutrons (as for Source_adapt)
dE	meV	Energy spread as for Source_adapt (energy range is from E0-dE to E0+dE)

Output parameters

Name	Unit	Description	Default
Lmin	AA	Minimum wavelength in energy range
Lmax	AA	Maxium wavelength in energy range
l0	AA	Mean wavelength of neutron spectra, about 1.8 AA for thermal neutrons
L2P	AA**4	Normalisation constant for Maxwell distribution

Links

• Source code for Convert_FlatE_2_Maxwell.comp.
• Source code of d20adapt.instr, where this component is used
• A source producing a flat in energy distribution: Source_adapt.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