[neutron-mc] Curved monochromator

[Jörg Voigt]

Dear mailing list subscribers,
I try to model a curved monochromator for thermal neutrons with horizontal and 
vertical focussing. The monochromator is fairly large, 40 cm wide and 30 cm 
high. Using a Cu (220) monochromator, D=1.28 A, I end up with an Bragg angle 
of 23 deg. Now the problem, the focus of monochromator is not exactly at 
2*Braggangle. Using a psd Monitor relative to the scattered beam, the offset 
is always in negative x direction and larger the smaller the horizontal 
radius of curvature becomes, i.e. for a stronger curved monochromator.
Did this happen already to anybody?
Thank you
-- 
======================
Dr.Jörg Voigt
Institut für Streumethoden
Forschungszentrum Jülich
52424 Jülich
Deutschland
Tel: +49 2461 616020
Fax: +49 2461 612610
Mobil: +49 160 8479827
Email: j.voigt at fz-juelich.de
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