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McStas: Samples_Incoherent Instrument at Tests_samples

[ Identification | Description | Input parameters | Output 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
  • Version: 0.1

Description

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

  V_sample
  PowderN
  Single_crystal
  Isotropic_sqw
  Incoherent

Examples:

Compare incoherent scattering from all 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 Samples_Incoherent -d Some_directory -N5 SAMPLE=1,5 STOP=1 V_multiples=0

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.laz
  cube.off: 6=PowderN, 
            7=Single_Crystal 
            8=Isotropic_Sqw 
            9=Incoherent


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 box: 1=Vanadium 2=PowderN 3=Single_Crystal 4=Isotropic_Sqw 5=Incoherent cube.off: 6=PowderN, 7=Single_Crystal 8=Isotropic_Sqw 9=Incoherent  
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

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

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

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Wed Apr 19 10:57:33 2017


Last Modified: Wednesday, 19-Apr-2017 12:57:33 CEST
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