Dear FLUKA experts
For simulating a beam stop for a 150 MeV electron beam, I have considered
this geometry: A graphite cylinder with length of 5 cm and radius of 3 cm
is inserted at the end of a recess of 12 cm length to act as a soft stop
to reduce the back-scatter, this section followed by 3 cm copper and 26 cm
steel as a beam dump.
In the physics part of my input, I activated the PHOTONUC card for all
energies and the sdum of PRECISIO for the DEFALTS card.
According to the fluka results, all primary electrons are stopped in about
2 cm of copper while I expected at least 3 cm (by considering the effect
of graphite in attenuating the electrons) to 3.5 cm of copper stops them
according to CSDA range at
https://physics.nist.gov/PhysRefData/Star/Text/ESTAR.html.
What is the reason for this inconsistency?
Best Regards
Hamideh
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Received on Sun Jan 19 2020 - 12:55:12 CET