Articolo in rivista, 2018, ENG, 10.1063/1.5038963

Design of gamma-ray spectrometers optimized for fast particle studies at ITER

Rebai M.; Bertalot L.; Brichard B.; Brolatti G.; Croci G.; Esposito B.; Fernandes A.; Giacomelli L.; Gorini G.; Krasilnikov V.; Lengar I.; Marocco D.; Muraro A.; Nocente M.; Pereira R.C.; Perelli Cippo E.; Rigamonti D.; Rzadkiewicz J.; Sousa J.; Tardocchi M.

Istituto di Fisica Del Plasma, Consiglio Nazionale Delle Ricerche, Milano, , Italy; Dipartimento di Fisica G. Occhialini, Università di Milano-Bicocca, Milano, , Italy; ITER Organization, Saint Paul Lez Durance, Cedex, , France; Fusion for Energy, Barcellona, , Spain; ENEA C. R. Frascati, Dipartimento FSN, Frascati, , Italy; Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, 1049-001, , , Portugal; Instituto de Plasmas e Fusão Nuclear, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, 1049-001, , , Portugal; Tokamak Energy Ltd., 120A Olympic Avenue, Milton Park, Oxon, OX14 4SA, , United Kingdom; Jozef Stefan Institute, Ljubljana, , Slovenia; National Center for Nuclear Research, NCBJ, Swierk, Warsaw, , Poland

A set of gamma ray spectrometers has been designed for ITER within the Radial Gamma Ray Spectrometer (RGRS) project. The aim of this project is designing a system, integrated with the ITER radial neutron camera, which is able to measure the gamma-rays emitted from the plasma with a good energy resolution (about 1.5% at 4.44 MeV) and at high counting rates (in excess of 1 MHz). The RGRS will be able to operate both in the D phase and in the full-power DT phase and will measure gamma rays from (i) reactions between fast ions, such as particles, and light impurities and (ii) bremsstrahlung emission generated by runaway electron interactions with both plasma bulk and tokamak walls. The RGRS detectors are arranged in nine lines of sights (able to cover a radial region with r < a/3), each featuring a large LaBr3 scintillator crystal. Due to the high neutron flux and magnetic field, several solutions have been adopted to guarantee a good signal to background ratio and MHz counting rate capabilities. The RGRS is capable to combine space and energy distribution measurements of particles and runaway electrons, which will help the study of the fast particle physics in a burning plasma. Published by AIP Publishing. https://doi.org/10.1063/1.5038963

Review of scientific instruments online 89 (10)

Keywords

Runaway electrons; Neutron flux; Tokamaks; Gamma rays; Alpha particles; Bremsstrahlung; Plasma impurities; Particle physics

CNR authors

Nocente Massimo, Croci Gabriele, Muraro Andrea, Rebai Marica, Rigamonti Davide, Gorini Giuseppe, Perelli Cippo Enrico, Giacomelli Luca Carlo, Tardocchi Marco

CNR institutes

IFP – Istituto di fisica del plasma "Piero Caldirola"