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

The Incoherent_test Instrument

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

Identification

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"

Links


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

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Thu Feb 10 12:52:13 2011