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

The Selector Component

velocity selector (helical lamella type) such as V_selector component

Identification

• Author: Peter Link, Andreas Ostermann
• Origin: Uni. Gottingen (Germany)
• Date: MARCH 1999
• Version: 1.10

Description

Velocity selector consisting of rotating Soller-like blades
defining a helically twisted passage.
Geometry is defined by two identical apertures at 12 o'clock position, 
The origin is at the ENTRANCE of the selector.

Example: Selector(xmin=-0.015,  xmax=0.015,  ymin=-0.025, ymax=0.025, len=0.25,
           num=72,width=0.0004, radius=0.12, alfa=48.298, feq=500)
These are values for the D11@ILL Dornier 'Dolores' Velocity Selector (NVS 023)

%VALIDATION
Jun 2005: extensive external test, one minor problem 
Jan 2006: problem solved (for McStas 1.12c)
Validated by: K. Lieutenant

%BUGS
for transmission calculation, each neutron is supposed to be in the guide centre

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
xmin	m	Lower x bound of entry aperture	-0.015
xmax	m	Upper x bound of entry aperture	0.015
ymin	m	Lower y bound of entry aperture	-0.025
ymax	m	Upper y bound of entry aperture	0.025
len	m	rotor length	0.25
num	1	number of spokes/lamella	72
width	m	width of spokes at beam-center	0.0004
radius	m	radius of beam-center	0.12
alfa	deg	angle of torsion	48.298
feq	1/s	frequency of rotation	500

Links

• Source code for Selector.comp.
• See also Additional notes March 1999 and Jan 2000.

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

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Fri May 11 08:41:08 2012

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Last Modified: Friday, 11-May-2012 10:41:08 CEST