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

The Filter_Graphite component

Pyrolytic graphite filter

Identification

• Author: Thomas C Hansen
• Origin: ILL (Dif/D20)
• Date: 07 March 2000
• Version: 1.0

Description

This pyrolytic graphite filter, defined by two identical rectangular opening apertures, 
is based upon empiric data and determines by
interpolation the transmission of an incomming neutron, depending on its 
wavelength. This type of filter is e.g. used to supress higher harmonics, so
the 1.2 AA contribution to the 2.4 AA obtained by a highly orientated 
pyrolytic graphite (HOPG) monochromator at a takeoff angle of 42 deg., as
it is the case for the powder diffractometer D20 at the ILL Grenoble

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
xmin	m	Lower x bound (-0.16)
xmax	m	Upper x bound ( 0.16)
ymin	m	Lower y bound (-0.16)
ymax	m	Upper y bound ( 0.16)
len	m	Thickness of graphite plate ( 0.05)

Output parameters

None.

Links

• Source code for Filter_Graphite.comp.
• Source code of d20adapt.instr, where this component is used

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

Generated automatically by McDoc, Kristian Nielsen <kristian.nielsen@risoe.dk> / Jan 22 2001

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Last Modified: Tuesday, 22-Jun-2004 14:04:09 CEST