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McStas: SE_example2 Instrument at Templates

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

The SE_example2 Instrument

Mockup of transmission Spin-Echo, written for PNCMI 2010 school in Delft. This version uses Pol_FieldBox for description of the fields.


  • Site: Templates
  • Author: Erik Knudsen, Peter Willendrup
  • Origin: Risoe
  • Date: June 2010
  • Version:(Unknown)


This instrument shows the use of essential McStas polarisation components, including Pol_mirror, Pol_FieldBox and MeanPolLambda_monitor.

Pol_mirror is used to polarize and analyze the incoming and scattered beams.
Pol_FieldBox is used to define guidefields and flippers.
MeanPolLambda_montior is used to monitor beam polarisation.

Example: mcrun SE_example2.instr dBz=-0.0001,0.0001 -N41 -n1e5 

Input parameters

Parameters in boldface are required; the others are optional.
Name Unit Description Default
POL_ANGLE deg Reflection angle of polarizer/analyzer 2
SAMPLE 1 Flag to include (0) or exclude incoherent scatterer 0
Bguide T Field magnitude in guide fields 0.1
Bflip T Magnitude of flipper fields, 3e-4
dBz T Magnitude field perturbation in first guide field 0
Lam Angstrom Mean wavelength of neutrons emitted from source 8
dLam Angstrom Wavelength spread of neutrons emitted from source 0.8


  • Source code for SE_example2.instr.
  • Requires mcstas 1.12b (or beta). PolLambda_monitor has been modified to work (nL->nlam)

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

Generated automatically by McDoc, Peter Willendrup <> / Tue May 26 13:03:59 2020

Last Modified: Tuesday, 26-May-2020 15:03:59 CEST
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