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A new hard x-ray spectrometer for runaway electron measurements in tokamaks

Authors :: A Dal Molin
M Nocente
M Dalla Rosa
E Panontin
D Rigamonti
M Tardocchi
A Shevelev
E Khilkevitch
M Iliasova
L Giacomelli
G Gorini
E Perelli Cippo
F D’Isa
G Pautasso
G Papp
G Tardini
E Macusova
J Cerovsky
O Ficker
M Salewski
V Kiptily
EUROfusion MST1 Team
COMPASS Team
ASDEX Upgrade Team, Max Planck Institute for Plasma Physics, Max Planck Society
Source :: the ASDEX Upgrade Team, the Eurofusion MST1 Team, the COMPASS Team, Dal Molin, A, Nocente, M, Dalla Rosa, M, Panontin, E, Rigamonti, D, Tardocchi, M, Shevelev, A, Khilkevitch, E, Iliasova, M, Giacomelli, L, Gorini, G, Perelli Cippo, E, D’Isa, F, Pautasso, G, Papp, G, Tardini, G, Macusova, E, Cerovsky, J, Ficker, O, Salewski, M & Kiptily, V 2023, ' A new hard x-ray spectrometer for runaway electron measurements in tokamaks ', Measurement Science and Technology, vol. 34, no. 8, 085501 . https://doi.org/10.1088/1361-6501/acd46c, Measurement Science and Technology
Publication Year :: 2023
Publisher :: IOP Publishing, 2023.
Abstract: Runaway electron gamma-ray detection system, a novel hard x-ray (HXR) spectrometer optimized for bremsstrahlung radiation measurement from runaway electrons in fusion plasmas, has been developed. The detector is based on a 1‘×1’ LaBr3:Ce scintillator crystal coupled with a photomultiplier tube. The system has an energy dynamic range exceeding 20 MeV with an energy resolution of 3% at 661.7 keV. The detector gain is stable even under severe loads, with a gain shift that stays below 3% at HXR counting rates in excess of 1 MCps. The performance of the system enables unprecedented studies of the time-dependent runaway electron energy distribution function, as shown in recent runaway electron physics experiments at the ASDEX Upgrade and COMPASS tokamaks.