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McStas: Samples_Incoherent

[ Identification | Description | Input parameters | Links ]

The Samples_Incoherent Instrument

This instrument allows to compare incoherent scattering from different McStas sample components.

Identification

  • Site: Tests_samples
  • Author: Peter Willendrup, Erik Knudsen, Aziz Aziz Daoud-aladine
  • Origin: RISOE
  • Date: August 14th, 2007

Description

This instrument allows to compare incoherent scattering from different McStas
sample components:

* PowderN
Single_crystal
Isotropic_sqw
Incoherent

Examples:

Compare incoherent scattering from all sample comps, beamstop in place.

mcrun Samples_Incoherent -d Some_directory -N5 SAMPLE=1,5 STOP=1

Compare incoherent scattering and direct beam attenuation for PowderN, Single_crystal
and Isotroic_sqw:

mcrun Samples_Incoherent -d Some_other_directory -N4 SAMPLE=2,5 STOP=0

Have a closer look of direct beam attentuation for PowderN, Single_crystal
and Isotroic_sqw (has the side-effect that back-scattered neutrons are absorbed):

mcrun Samples_Incoherent -d Some_third_directory -N4 SAMPLE=2,5 STOP=0 DB=1

The sample type selection is:
box:      1=Vanadium
2=PowderN
3=Single_Crystal
4=Isotropic_Sqw
5=Incoherent
10=Isotropic_Sqw with V.lau
cube.off: 6=PowderN,
7=Single_Crystal
8=Isotropic_Sqw
9=Incoherent

Input parameters

Parameters in boldface are required; the others are optional.
NameUnitDescriptionDefault
L_minAAMinimum wavelength of neutrons0.5
L_maxAAMaximum wavelength of neutrons7
SAMPLE Sample choice, 1:Incoherent, 2:PowderN, 3:Single_crystal, 4:Isotropic_Sqw, 5:Incoherent with multiple scattering, 6:PowderN with OFF geometry, 7:Single_crystal with OFF geometry, 8:Isotropic_Sqw with OFF geometry, 9:Incoherent with OFF geometry, 10:Isotropic_Sqw with .laz input1
STOP1Beamstop inserted? (Needed in case of comparison between V and SX/sqw).0
Order1Maximum order of multiple scattering in SX/sqw0
INCbarnsIncoherent scattering cross section5.08
ABSbarnsAbsorption cross section5.08
DB1Direct Beam monitor inserted? (Side-effect: absorbs 'backscattered' neutrons).0
ISISFACEstringISIS moderator face to look at"hydrogen"

Links

  • Source code for Samples_Incoherent.instr.
  • Validation of Single_crystal is now in progress!

[ Identification | Description | Input parameters | Links ]

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


Last Modified: Tuesday, 16-Apr-2024 20:05:20 CEST
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