Properties of collimators

[Kristian Nielsen]

Dear Martin Meven,

I read your mail. What you say seems reasonable, but I have no personal
experience doing collimator design. However, assuming you want to make
some simulations on the problem I quickly put together a simple McStas
simulation for you. You will have to modify some of the details as
appropriate, such as the Cu reflection you use (eg. Q=4.923 for (220)),
the precise dimensions of the collimator and monochromator, etc. Ask if
you need further help.

The simulation takes three parameters (this could be easily changed):
the collimation `col' (in minutes of arc), the thickness `thick' of the
blades in the collimator, and the scattering angle `Theta'. It computes
the intensity and energy spectrum at three different positions: just
before the monochromator, just outside the monochromator shielding, and
at the sample position.

Hope this helps,

 - Kristian.

--
Kristian Nielsen        kristian.nielsen at risoe.dk
Risø National Laboratory
Condensed Matter Physics and Chemistry Department
Tel. +45 4677 5515   Fax +45 4677 4790
Encryption PGP key http://neutron.risoe.dk/kn.txt

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