[neutron-mc] Problems with FermiChopper.comp & Chopper_fermi.comp

Jörg Voigt j.voigt at fz-juelich.de
Tue Jul 12 17:19:22 CEST 2005

I encountered several problems with the 2 fermi chopper components mentioned 
FermiChopper.comp located in contrib:
If I use 2 choppers I can not compile, because several variables (xstrich, 
zstrich) are already defined.
chopper_fermi.comp located in optics:
I try to mimic a straight Fermi chopper, therefore I set the radius of 
curvature to large values like 1e6. Problems arise, if I put a small width 
for individual slits. E.g. for w=0.005 and n=20 I get a flux of 3e7 for a 
radius of 0.05. Changing w=0.001 and n=100 yields flux zero for the same 
radius, while w=0.002 and n=50 gives 0.6e6. I don't understand what really 
triggers the transmission of the component.

Thank you for any help with the two components

Dr.Jörg Voigt
Institut für Streumethoden
Forschungszentrum Jülich
52424 Jülich
Tel: +49 2461 616020
Fax: +49 2461 612610
Mobil: +49 160 8479827
Email: j.voigt at fz-juelich.de

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