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

The PSI_DMC Instrument

Identification

• Site: PSI
• Author: Peter Willendrup (Risoe), Uwe Filges (PSI), Lukas Keller (PSI)
• Origin:PSI
• Date: May 7th, 2008
• Version: 1.4

Description

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

Please note that this instrumentfile 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

Example: 
mcrun PSI_DMC.instr lambda=2.5666 FileName="Na2Ca3Al2F14.laz" -n1e8

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 filename, 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

Links

• 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 <peter.willendrup@risoe.dk> / Fri May 11 08:41:09 2012

---

Last Modified: Friday, 11-May-2012 10:41:09 CEST