Re: More on heavy ions

From: Marco Mauri <>
Date: Thu Jul 03 2008 - 11:48:52 CEST

Dear Joel,
I think you are not obtaining 1 for two reasons:
1) A fraction of the beam is not hitting the target (due to beam shape
and divergence)
2) The VAC region's material is AIR (so the beam is travelling for ~15m
in air)

After changing this settings (VAC to VACUUM, beam size and divergence to
zero) and rerunning
you can look in the *_usryield_22_sum.lis where the unnormalized tot.
response (integrated over the LET) can be found.
Multiplying this value by the second variable bin width (100) 1 should
be obtained.


> fluka-discuss:
> The suggestions given by Francesco have been very helpful
> (,
> of which I am extremely grateful. However, I have encountered a
> fundamental problem. As an example, I have attached my input for 1
> GeV/n 56-Fe on aluminum. The resulting spectra obtained with USRYIELD
> do not integrate to 1. Our experimental data is binned LET,
> normalized per unit ion per unit area. Multiplying a fluence
> contribution by the area and summing all the contributions of course
> gives 1. Perhaps I am handling the double differential yield
> inappropriately.
> Suggestions will be most appreciated.
> Joel DeWitt
Received on Thu Jul 3 12:46:00 2008

This archive was generated by hypermail 2.1.8 : Thu Jul 03 2008 - 12:46:01 CEST