[ Identification | Description | Input 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 -zdepth/2).
Transmission is analytical assuming a continuous source.

Example: V_selector(xwidth=0.03, yheight=0.05, zdepth=0.30, radius=0.12, alpha=48.298, length=0.25, d=0.0004, nu=20000, nslit=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.
NameUnitDescriptionDefault
xwidthmWidth of entry aperture0.03
yheightmHeight of entry aperture0.05
zdepthmDistance between apertures, for housing containing the rotor0.30
radiusmHeight from aperture centre to rotation axis0.12
alphadegTwist angle along the cylinder48.298
lengthmLength of cylinder/rotor (less than zdepth)0.25
dmThickness of blades0.0004
nuHzCylinder rotation speed, counter-clockwise, which is ideally 3956*alpha*DEG2RAD/2/PI/lambda/length300
nslit1Number of Soller blades72
AT ( , , ) RELATIVE
ROTATED ( , , ) RELATIVE

Links


[ Identification | Description | Input parameters | Links ]

Generated on 2023-09-19 20:01:36