[mcstas-users] Finite transmission probability for DiskChopper component

Marc Seifert Marc.Seifert at frm2.tum.de
Tue Nov 19 13:23:29 CET 2019

Hello everyone,

we are simulating a chopper system over a large wavelength spectrum (0.5 
to 10 AA). We would like to consider finite transmission of the choppers 
and we expect this to be 1E-7 for 3 AA and up to 0.007 for 1 AA. We 
would like to simulate the overall impact on the performance of the 
instrument by implementing a transmission probability to the DiskChopper 
component, but we are not sure which would be the best approach.

Is it possible to check in the EXTEND section of a DiskChopper if the 
neutron was absorbed and then restore it with a certain probability? Or 
would it be better to change the neutron weight instead of absorbing it 
in the component? Additionally with a cutoff at a certain wavelength in 
order to not propagate every neutron with very tiny weight through the 
whole instrument.

Any help is very much appreciated.

Marc Seifert and Aureliano Tartaglione

More information about the mcstas-users mailing list