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.
Dal Molin, A., Nocente, M., Dalla Rosa, M., Panontin, E., Rigamonti, D., Tardocchi, M., et al. (2023). A new hard x-ray spectrometer for runaway electron measurements in tokamaks. MEASUREMENT SCIENCE & TECHNOLOGY, 34(8) [10.1088/1361-6501/acd46c].
A new hard x-ray spectrometer for runaway electron measurements in tokamaks
Dal Molin A.
;Nocente M.;Dalla Rosa M.;Panontin E.;Rigamonti D.;Tardocchi M.;Gorini G.;Perelli Cippo E.;
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.
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