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

The SNS_source Component

A source that produces a time and energy distribution from the SNS moderator files

Identification

• Author: G. Granroth
• Origin: SNS Project Oak Ridge National Laboratory
• Date: July 2004
• Version: 1.01

Description

Produces a time-of-flight spectrum from SNS moderator files
moderator files can be obtained from the SNS website .
The output units of this component are N/pulse
Notes:
(1) the raw moderator files are per Sr.  The focusing parameters provide the solid
angle accepted by the guide to remove the Sr dependence from the output. Therefore 
the best practice is to set xw and yh to the width and height of the next beam 
component, respectively. The dist parameter should then be set as the distance 
from the moderator to the first component.
(2) This component works purely by interpolation. Therefore be sure that Emin and 
Emax are within the limits of the moderator file
 

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
S_filename	-	Filename of source data
width	m	width of moderator
height	m	height of moderator
dist	m	Distance from source to the focusing rectangle
xw	m	Width of focusing rectangle
yh	m	Height of focusing rectangle
Emin	meV	minimum energy of neutron to generate
Emax	meV	maximum energy of neutron to generate

Output parameters

Name	Unit	Description	Default
hdiv
vdiv
p_in

Links

• Source code for SNS_source.comp.

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

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Last Modified: Wednesday, 03-Jan-2024 19:11:12 CET