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

The Test_Monochromators Instrument

Compares intensities of Monochromator components.

Identification

• Site: Tests_optics
• Author: Peter Christiansen
• Origin: RISOE.
• Date: July 2006.

Description

Very simple setup to compare intensities diffracted by Monochromators.
It shows that implementations are equivalent.

PG 002 oriented examples:

Examples

(Test cases in bold)

• Test: Mono=1 Detector: psd1_I=8.9e-05
• Test: Mono=2 Detector: psd1_I=8.9e-05
• Test: Mono=3 Detector: psd1_I=8.9e-05
• Test: Mono=4 Detector: psd1_I=8.9e-05
• Test: Mono=5 Detector: psd1_I=8.9e-05
• Test: Mono=6 Detector: psd1_I=1.0e-04
• Test: Mono=6 PG=1 Detector: psd1_I=1.3e-04
• Test: Mono=6 powder=1 Moz=60 Detector: psd1_I=4.5e-07
• Test: Mono=6 ay=2.13389 az=-1.232 bz=2.464 cx=6.711 Detector: psd1_I=1.0e-04
• Test: Mono=6 ay=2.94447 by=1.47224 bz=2.54999 cx=0.936252 recip=1 Detector: psd1_I=1.0e-04
• Test: Mono=7 ay=2.94447 by=1.47224 bz=2.54999 cx=0.936252 recip=1 Detector: psd1_I=9.6e-05
• SiO2 lattice orientation examples:
• Example: Mono=1 DM=4.25504 lmin=0.1 lmax=7.0 lambda=6.0
• Example: Mono=6 DM=4.25504 lmin=0.1 lmax=7.0 lambda=6.0 reflections=SiO2_quartza.lau ax=4.3271 az=-2.49825 bz=4.9965 cy=-5.4543
• Example: Mono=6 DM=4.25504 lmin=0.1 lmax=7.0 lambda=6.0 reflections=SiO2_quartza.lau recip=1 ax=1.45205 bx=0.726027 bz=1.25752 cy=-1.15197
• Example: Mono=7 DM=4.25504 lmin=0.1 lmax=7.0 lambda=6.0 NXrefs=SiO2-alpha_sg154_AlphaQuartz.ncmat recip=1 ax=1.45205 bx=0.726027 bz=1.25752 cy=-1.15197

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
Mono	1	Choice of Monochromator component to use, with 1=Monochromator_flat 2=Monochromator_pol 3=Monochromator_pol (forcing 1% events to be reflected) 4=Monochromator_curved (in flat mode) 5=Monochromator_2foc (contrib, flat mode) 6=Single_crystal 7=NCrystal	1
lmin	AA	Minimum wavelength produced from source	1.6
lmax	AA	Maximum wavelength produced from source	2.4
Moz	arcmin	Mosaicity	40
reflections	str	input-file for Single_crystal (Mono=6)	"C_graphite.lau"
NXrefs	str	input-file for NCrystal (Mono=7)	"C_sg194_pyrolytic_graphite.ncmat"
DM	AA	Mono lattice spacing (should be chosen compatible with file-unput when Mono=6/7	3.3539
PG	1	PG-mode for Single_crystal (range 0-1)	0
powder	1	Powder-mode for Single_crystal	0
order	1	Maximum order of scattering in Single_crystal	0
ax	AA or 1/AA	x-coordinate of 1st direct/recip lattice unit cell vector (depends on recip setting)	0
ay	AA or 1/AA	y-coordinate of 1st direct/recip lattice unit cell vector (depends on recip setting)	0
az	AA or 1/AA	z-coordinate of 1st direct/recip lattice unit cell vector (depends on recip setting)	0
bx	AA or 1/AA	x-coordinate of 2nd direct/recip lattice unit cell vector (depends on recip setting)	0
by	AA or 1/AA	y-coordinate of 2nd direct/recip lattice unit cell vector (depends on recip setting)	0
bz	AA or 1/AA	z-coordinate of 2nd direct/recip lattice unit cell vector (depends on recip setting)	0
cx	AA or 1/AA	x-coordinate of 3rd direct/recip lattice unit cell vector (depends on recip setting)	0
cy	AA or 1/AA	y-coordinate of 3rd direct/recip lattice unit cell vector (depends on recip setting)	0
cz	AA or 1/AA	x-coordinate of 3rd direct/recip lattice unit cell vector (depends on recip setting)	0
recip	1	Flag to indicate if ax/y/z, bx/y/z, cx/y/z lattice corrdinates are in direct (=0) or reciprocal space units	0
dthick	m	Thickness of mono slab in Mono=6/7 cases	0.0015
p_transmit	1	Probability of transmission in Single_crystal Mono=6 case	0.001
lambda	AA	Target mochromator wavelength	2.0

Links

• Source code for Test_Monochromators.instr.

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

Generated for mcstas 3.8.4

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Last Modified: Friday, 11-Sep-2026 15:00:09 CEST