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

The V_selector Component

Velocity selector.

Identification

• Author: Kim Lefmann
• Origin: Risoe
• Date: Nov 25, 1998
• Version: 1.27

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)

%VALIDATION
Jun 2005: extensive external test, no problems found 
Validated by: K. Lieutenant

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

• Source code for V_selector.comp.

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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