From: Feracci Vincent (feracci@ganil.fr)
Date: Tue May 15 2007 - 16:22:29 CEST
Hello Fluka users,
I am simulating the bombardment of a cylindric graphite converter (8 cm
diameter, 1 cm thick) by a 40 MeV deuton beam (gaussian spatial
repartition) in order to produce neutrons. However in my simulation I
measure a convertion factor which is close to 1 ( 1 deuton creates 1.1
neutron) while it should be, according to other simulations and
experiments about 0.01. In order to take into account deuton
interaction, I used the following parameters:
DEFAULTS
PRECISIO
EVENTYPE 2.0
DPMJET (i have linked the DPMJET library)
PHYSICS 1.0
COALESCE
PHYSICS 3.0
EVAPORAT
PHYSICS 1.0 0.001
IONSPLIT
LOW-NEUT 72.0 22.0 0.0196 1.0
I used Usrtrack and Usrbdx to measure fluence inside the converter and
at given angles of the incident deuton beam. I run my calculations on
FLAIR V0.4 and simulated with 20.000.000 primaries separated in 50 runs.
I am unsure of the physics models I have used but I can't manage to
understand what is wrong with my simulation. I have attached my input
file to this mail. Is it a problem of energy threshold for the deutons
who by consequence all split to give neutrons?
Thanks in advance,
Vincent Feracci
Intern at the GANIL on SPIRAL2 project
feracci@ganil.fr
This archive was generated by hypermail 2.1.6 : Tue May 15 2007 - 16:40:24 CEST