The `templateDIFF` Instrument

Simple monochromator Diffractometer for powders

Identification

Site: Templates
Author: E. Farhi
Origin: LLB/ILL
Date: 13 Apr 2006

Description

A template powder diffractometer used as a tutorial at LLB.
Default geometry is from D20@ILL.

If included after a guide, use ALPHA1=0 and L1=0 (the first collimator is then
the guide with effective ALPHA1=m*0.1*lambda). If you prefer to include
explicitely a collimator before the monochromator, use L1=1.2.

Monochromator lattice parameter
PG       002 DM=3.355 AA (Highly Oriented Pyrolythic Graphite)
PG       004 DM=1.607 AA
Heusler  111 DM=3.362 AA (Cu2MnAl)
CoFe         DM=1.771 AA (Co0.92Fe0.08)
Ge       111 DM=3.266 AA
Ge       311 DM=1.714 AA
Ge       511 DM=1.089 AA
Ge       533 DM=0.863 AA
Si       111 DM=3.135 AA
Cu       111 DM=2.087 AA
Cu       002 DM=1.807 AA
Cu       220 DM=1.278 AA
Cu       111 DM=2.095 AA

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
lambda	Angs	Wavelength at monochromator, computed from DM and THETA_M if left as 0.	1
DM	Angs	d-spacing of monochromator, computed from lambda and THETA_M if left as 0.	3.355
Powder	str	File name for powder description	"Na2Ca3Al2F14.laz"
RV	m	Monochromator vertical curvature, 0 for flat, -1 for automatic setting	-1
L1	m	Source-Monochromator distance	17
L2	m	Monochromator-Sample distance	3.2
L3	m	Sample-Detector distance	1.471
ALPHA1	min	Horizontal collimator divergence for L1 arm (before monochromator)	5
ALPHA2	min	Horizontal collimator divergence for L2 arm (monochromator-sample)	60
ALPHA3	min	Horizontal collimator divergence for L3 arm (sample-detector)	5
ETA	min	Monochromator horizontal mosaic (gaussian)	12
verbose	int	Print DIF configuration. 0 to be quiet	1
THETA_M	deg	Monochromator take-off angle, computed from lambda and DM if left as 0.	0
SM	int	Scattering sense of beam from Monochromator. 1:left, -1:right	1

The templateDIFF Instrument

Identification

Description

Input parameters

Links

The `templateDIFF` Instrument