The `Incoherent_test` Instrument

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

Identification

Site: tests
Author: Peter Willendrup, Erik Knudsen, Aziz Aziz Daoud-aladine
Origin: RISOE
Date: August 14th, 2007
Version: 0.1

Description

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

 V_sample
 PowderN
 Single_crystal
 Isotropic_sqw


Examples: 

Compare incoherent scattering from all four sample comps, beamstop in place:
(V_multiples=0: V_sample algo identical to PowderN algo - NO multiples
 V_multiples: V_sample performs crude estimate for multiple scattering)

  mcrun Incoherent_test -d Some_directory -N4 SAMPLE=1,4 STOP=1 V_multiples=0

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

  mcrun Incoherent_test -d Some_other_directory -N3 SAMPLE=2,4 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 Incoherent_test -d Some_third_directory -N3 SAMPLE=2,4 STOP=0 DB=1

Input parameters

Parameters in boldface are required; the others are optional.

Name	Unit	Description	Default
L_min	AA	Minimum wavelength of neutrons	0.5
L_max	AA	Maximum wavelength of neutrons	7
SAMPLE	1	1==Vanadium 2==PowderN 3==Single_Crystal 4==Isotropic_sqw
STOP	1	Beamstop inserted? (Needed in case of comparison between V and SX/sqw).	0
V_multiples	1	Use crude estimate for multiple scattering in V_sample?	1
Order	1	Maximum order of multiple scattering in SX/sqw	0
INC	barns	Incoherent scattering cross section	5.08
ABS	barns	Absorption cross section	5.08
DB	1	Direct Beam monitor inserted? (Side-effect: absorbs 'backscattered' neutrons).	0
ISISFACE	string	ISIS moderator face to look at	"hydrogen"

The Incoherent_test Instrument

Identification

Description

Input parameters

Links

The `Incoherent_test` Instrument