Soft X-Ray (SXR) diagnostics are crucial in magnetically confined nuclear fusion experiments for studying plasma behavior, such as magneto-hydrodynamic (MHD) instabilities and impurity dynamics. Gas Electron Multiplier (GEM) detectors offer a valuable approach for SXR detection, given their radiation hardness and unique combination of high-rate imaging and spectroscopic capabilities. This study investigates the impact of high neutron rate on the GEM detector spectroscopic response in the MAST-U spherical tokamak. A sample energy spectrum obtained from the GEM diagnostic is compared with Geant4 simulations of both SXR and neutron sources to characterize background effects and study the detector response.
Analysis of neutron related background of the SXR GEM diagnostic on MAST-U
Guiotto, F.;
2025
Abstract
Soft X-Ray (SXR) diagnostics are crucial in magnetically confined nuclear fusion experiments for studying plasma behavior, such as magneto-hydrodynamic (MHD) instabilities and impurity dynamics. Gas Electron Multiplier (GEM) detectors offer a valuable approach for SXR detection, given their radiation hardness and unique combination of high-rate imaging and spectroscopic capabilities. This study investigates the impact of high neutron rate on the GEM detector spectroscopic response in the MAST-U spherical tokamak. A sample energy spectrum obtained from the GEM diagnostic is compared with Geant4 simulations of both SXR and neutron sources to characterize background effects and study the detector response.
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