pyFC: a TRIM-based fission chamber pulse shape simulator

Report, 2015

This report presents the code system pyFC (python-based simulation of Fission Chambers) which simulates the pulse creation in fission chambers. The current pulses in a fission chamber are generated due to the ionization of the filling gas by the heavy ion emitted from the neutron induced fission in the fissile deposit. In pyFC the path of the heavy ion and the spatial distribution of the charges emerging from the ionization process are simulated with the TRIM code, and the parameters of the charge collection between the electrodes are computed with the BOLSIG software. The coupling of the codes is done in Python. The report presents the physical and geometrical considerations implemented in pyFC and the verification of the code through comparison with the results of Chester, a CEA code for simulation of fission chambers.