[ Identification | Description | Input parameters | Links ]

The Guide_curved Component

Non-focusing curved neutron guide.

Identification

• Site:
• Author: Ross Stewart
• Origin: ILL (France).
• Date: November 18 2003

Description

Models a rectangular curved guide tube with entrance centered on the Z axis.
The entrance lies in the X-Y plane.  Draws a true depiction
of the guide, and trajectories.  Guide is not focusing.

Example: Guide_curved(w1=0.1, h1=0.1, l=2.0, R0=0.99, Qc=0.021,
alpha=6.07, m=2, W=0.003, curvature=2700)

%BUGS
This component does not work with gravitation on. Use component Guide_gravity then.
Systematic error on transmitted flux is found to be about 10%.

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
l	m	length of guide
R0	1	Low-angle reflectivity	0.995
Qc	AA-1	Critical scattering vector	0.0218
alpha	AA	Slope of reflectivity	4.38
m	1	m-value of material. Zero means completely absorbing.	2
W	AA-1	Width of supermirror cut-off	0.003
curvature	m	Radius of curvature of the guide	2700

AT (	,	,		) RELATIVE		Generate
ROTATED (	,	,		) RELATIVE

Links

• Source code for Guide_curved.comp.
• Bender

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[ Identification | Description | Input parameters | Links ]

Generated on 2025-05-08 13:31:31

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Last Modified: Monday, 30-Jun-2025 11:05:11 CEST