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

The Selector Component

velocity selector (helical lamella type) such as V_selector component

Identification

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 1.12b)
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


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

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Fri Feb 11 10:12:09 2011