From: Arnaud Ferrari (Arnaud.Ferrari@tsl.uu.se)
Date: Mon Apr 16 2007 - 18:07:11 CEST
I have just started using FLUKA in order to calculate energy deposition in
a dump window at CLIC. I have simulated a simple problem: a 1.5 TeV electron
beam passing through a 2 mm thick copper layer. Since the radiation length of
copper is 1.4 cm, no electromagnetic shower should develop. From FLUKA I have
derived that 1/rho.(dE/dx) = 1.5 MeV/g.cm-2. This roughly corresponds to the
energy loss of a minimum ionizing particle in copper. Note that I use default
values for all cards in that case...
When using the analytical formulas of Seltzer and Berger, Int. J. Appl.
Radiat. Isot. Vol. 35, No. 7 (1984), based on Bethe's stopping power and
Sternheimer's theory of the density effect, 1/rho.(dE/dx) = 2.3 MeV/g.cm-2
in copper instead, i.e. about 50% more losses than for a minimum ionizing
I therefore wonder about the discrepancy between FLUKA and the paper. Is it
possible that not all interactions/effects are included in FLUKA? Or is that
paper not relevant for such high-energy electrons?
I hope that some experts could discuss this issue with me.
Thanks and best greetings,
-- Dr. Arnaud Ferrari IKP, box 535, 75121 Uppsala, Sweden http://www.isv.uu.se/~ferrari/index.html
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