Speaker
Fabio Moro
(Department of Fusion and Nuclear Safety Technology)
Description
The ITER Radial Neutron Camera (RNC) is a multichannel detection system hosted in the Equatorial Port Plug 1 (EPP 1) designed to provide information on the neutron source total strength and emissivity profiles through the measurement of the uncollided neutron flux along a set of collimated lines of sight (LOS). Furthermore the ion temperature profile and fuel ratio (nd/nt) can be assessed by means of line-integrated neutron spectral measurement.
The RNC consists of two sub-systems based on a fan-shaped array of cylindrical collimators: the ex-port LOSs, covering the plasma core, embedded in a massive shielding block located in the Port Interspace, and the in-port LOSs distributed in two removable cassette integrated inside the Port Plug.
Presently, the RNC layout development process is undergoing a System Level Design phase: several preliminary architectural options based on a System Engineering work have been defined for both the ex-port and in-port systems. A detailed nuclear analysis of these options has been performed through radiation transport calculations with the MCNP Monte Carlo code.
The MCNP model of each RNC architectural option has been developed and recursively integrated in an upgraded version of the ITER MCNP C-lite model where all the details of the EPP 1 and nearby diagnostic systems have been included. Successively, the radiation environment at the detectors positions has been fully characterized through the evaluation of the expected neutron spectra and the secondary gamma background due to neutrons interactions with the surrounding structures. Moreover, the impact of a reduced ex-port shielding block on the neutron and gamma spectra has been investigated. The results of the present study provide guidelines for the development of the RNC final design and the necessary data for the measurement performance analysis.
Co-authors
Andrea Mancini
(Department of Fusion and Nuclear Safety Technology, ENEA, I-00044 Frascati (Rome), Italy)
Basilio Esposito
(Department of Fusion and Nuclear Safety Technology, ENEA, I-00044 Frascati (Rome), Italy)
Daniele Marocco
(Department of Fusion and Nuclear Safety Technology, ENEA, I-00044 Frascati (Rome), Italy)
Davide Flammini
(Department of Fusion and Nuclear Safety Technology, ENEA, I-00044 Frascati (Rome), Italy)
Fabio Moro
(Department of Fusion and Nuclear Safety Technology, ENEA, I-00044 Frascati (Rome), Italy)
Giorgio Brolatti
(Department of Fusion and Nuclear Safety Technology, ENEA, I-00044 Frascati (Rome), Italy)
Rosaria Villari
(Department of Fusion and Nuclear Safety Technology, ENEA, I-00044 Frascati (Rome), Italy)
Salvatore Podda
(Department of Fusion and Nuclear Safety Technology, ENEA, I-00044 Frascati (Rome), Italy)
Sean Conroy
(Department of Physics and Astronomy, Applied Nuclear Physics, Uppsala University, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, Sweden)
