The `Source_multi_surfaces` Component

Rectangular neutron source with subareas - using wavelength spectra reading from files

Identification

Author: Ludovic Giller, Uwe Filges
Origin: PSI/Villigen
Date: 31.10.06
Version: 1.1
Modification history:

Description

This routine is a rectangular 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 source surface can be divided in subareas (maximum 7 in one dimension). 
For each subarea a discret spectrum must be loaded given by its corresponding
file. The name of the files are saved in one file and will be called with the
parameter "names".
In fact the routine first reads the spectrum from files (up to 49) and it 
selects randomly a subarea. Secondly it generates a neutron with an random
energy, selected from the spectrum corresponding to the subsurface chosen, and
with a random direction of propagation within the target.
ATTENTION 1:  the files must be located in the working directory where also
		the instrument file is located
ATTENTION 2:  the wavelenght distribution (or binning) must be uniform 


Usage example:
  Source_multi_surfaces(h=0.16,w=0.09,dist=1.18,xw=0.08,yh=0.15,xdim=4,ydim=4,
                        Lmin=0.01,Lmax=10.0,names="files_name.dat")

WARNING: This is a contributed Component.

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
names	str	Name of the file containing a list of the spectra file names eg. for a 3x2 (x,y) division : spec1_1.dat spec1_2.dat spec1_3.dat spec2_1.dat spec2_2.dat spec2_3.dat(RETURN-key)
h	m	Source y-height
w	m	Source x-width
dist	m	Distance to target along z axis
xw	m	Width(x) of target
yh	m	Height(y) of target
xdim	int	Number of subareas in the x direction
ydim	int	Number of subareas in the y direction
Emin	eV	Minimum energy of neutrons	0.0
Emax	eV	Maximum energy of neutrons	0.0
Lmin	AA	Minimum wavelength of neutrons	0.0
Lmax	AA	Maximum wavelength of neutrons	0.0

Output parameters

Name	Unit	Description	Default
p_in

The Source_multi_surfaces Component

Identification

Description

Input parameters

Output parameters

Links

The `Source_multi_surfaces` Component