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

The Gravity_guide component

Neutron guide with gravity. NB! This is a temporary component to be abandones when information about gravity is included in the kernel.

Identification

• Author: KL
• Origin: McStas release, component Guide
• Date: November 22 2000
• Version: 1.1
• Modification history:

Description

Models a rectangular guide tube centered on the Z axis. The entrance lies
in the X-Y plane.
A constant gravity is applied in the Y direction of the LOCAL coordinate
system. No gravity is applied for the flight path before the guide. 
For details on the geometry calculation see the description in the McStas
reference manual.

Example values: m=4 Qc=0.02 W=1/300 alpha=6.49 R0=1

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
w1	m	Width at the guide entry
h1	m	Height at the guide entry
w2	m	Width at the guide exit
h2	m	Height at the guide exit
l	m	length of guide
R0	1	Low-angle reflectivity
Qc	AA-1	Critical scattering vector
alpha	AA	Slope of reflectivity
m	1	m-value of material. Zero means completely absorbing.
W	AA-1	Width of supermirror cut-off

Output parameters

None.

Links

• Source code for Gravity_guide.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