[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=3D1.28 A, I end up with an Bragg an=
gle =

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 offse=
t =

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
-- =

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
Dr.J=F6rg Voigt
Institut f=FCr Streumethoden
Forschungszentrum J=FClich
52424 J=FClich
Deutschland
Tel: +49 2461 616020
Fax: +49 2461 612610
Mobil: +49 160 8479827
Email: j.voigt at fz-juelich.de
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
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