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

The V_selector Component

Velocity selector.

Identification

Description

Velocity selector consisting of rotating Soller-like blades
defining a helically twisted passage.
Geometry defined by two identical, centered apertures at 12 o'clock
position, Origo is at the centre of the selector (input is at -l0/2).
Transmission is analytical assuming a continuous source.

Example: V_selector(width=0.03, height=0.05, l0=0.30, r0=0.12, phi=42.298,
           l1=0.25, tb=0.0004, rot=20000, nb=72)
These are values for the D11@ILL Dornier 'Dolores' Velocity Selector (NVS 023)

Input parameters

Parameters in boldface are required; the others are optional.
Name Unit Description Default
width m Width of entry aperture 0.03
height m Height of entry aperture 0.05
l0 m Distance between apertures 0.30
r0 m Height from aperture centre to rotation axis 0.12
phi deg Twist angle along the cylinder 48.298
l1 m Length of cylinder (less than l0) 0.25
tb m Thickness of blades 0.0004
rot rpm Cylinder rotation speed, counter-clockwise 20000
nb 1 Number of Soller blades 72

Output parameters

Name Unit Description Default
RPM2OM  
omega  
phi_rad  
dt0  
dt1  
r_i  
r_f  
r_mean  
theta_i  
theta_f  
A  
d_s_phi  

Links


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

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Feb 28 2006