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McStas: Test_Fermi Instrument at Tests_optics

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

The Test_Fermi Instrument

Cross comparison of Fermi Chopper components

Identification

  • Site: Tests_optics
  • Author: E. Farhi [farhi@ill.fr]
  • Origin: ILL
  • Date: Sept 1st, 2008
  • Version:(Unknown)

Description

Cross comparison of Fermi Chopper components, using McStas and
contributed components, as well as rotating collimator approximations. It
shows that all implementations are equivalent. However, approximating rotating
guide are 30% faster than McStas Fermi chopper, and on the other hand
Vitess implementation is 100 times slower.


Input parameters

Parameters in boldface are required; the others are optional.
Name Unit Description Default
Fermi 1 Choice of Fermi chopper component to test, with 1=FermiChopper, 2=Vitess_ChopperFermi, 3=FermiChopper_ILL, 4=rotating Guide_gravity, 5=rotating Guide_channeled 1
lambda 3.39
width_FC m total slit pack width 0.044
height_FC m height of FC slit pack 0.064
length_FC m length of FC slit pack 0.012
FC_Hz Hz rotation speed. Omega=2*PI*nu in rad/s, nu*60 in rpm 100
Nslit_FC 120
d_SF m distance from Source to FC center 3
d_FD m distance from FC center to Detector 3
phase deg FC phase. Use -0 for automatic 271.92

Links


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

Generated automatically by McDoc, Peter Willendrup <peter.willendrup@risoe.dk> / Mon Jun 26 12:27:17 2017


Last Modified: Monday, 26-Jun-2017 14:27:17 CEST
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