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McStas: PSI_DMC Instrument at PSI

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

The PSI_DMC Instrument

McStas model of the DMC powder diffractometer at PSI, CH.


  • Site: PSI
  • Author: Peter Willendrup (Risoe), Uwe Filges (PSI), Lukas Keller (PSI)
  • Origin:PSI
  • Date: May 7th, 2008
  • Version:(Unknown)


McStas model of the DMC powder diffractometer at PSI, CH.

Please note that this instrument file does not include the radial collimator of DMC. 
To generate the full 800-bin angle coverage at DMC, you should combine two simulations
using this instrumentfile, with SHIFT=0 and 0.1. This will displace the detector by half
a bin-width, which is a standard procedure at the DMC diffractometer

Input parameters

Parameters in boldface are required; the others are optional.
Name Unit Description Default
lambda AA Choice of wavelength, affects both monochromator and source component 2.5666
R 1 Reflectivity of non-curved guides 0.87
R_curve 1 Reflectivity of curved guides 0.87
filename str Choice of reflection list file, e.g. from McStas data dir "Na2Ca3Al2F14.laz"
D_PHI deg Focusing 'd_phi' for PowderN, see mcdoc page 6
SHIFT deg Rotation of detector, set to 0.1 to displace by half a bin 0
PACK 1 Powder packing factor 0.7
Dw 1 Powder Debye-Waller factor 0.8
BARNS 1 Flag to define if powder reflection file |F2| is in Barns or fm 1


  • Source code for PSI_DMC.instr.
  • The PSI Monte-Carlo website.
  • P Willendrup, U Filges, L Keller, E Farhi, K Lefmann: Validation of a realistic powder sample using data from DMC at PSI, ICNS 2005 (Physica B, 386, (2006), 1032.)

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

Generated automatically by McDoc, Peter Willendrup <> / Wed Jan 12 15:13:32 2022

Last Modified: Wednesday, 12-Jan-2022 16:13:32 CET
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