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A fast directional hard x-ray (HXR) diagnostic system has been developed for the Q-shu University Experiment with Steady-State Spherical Tokamak using plastic scintillators coupled to photomultiplier ...tubes. During intense HXR emission, the detector response transitioned from pulse-counting to current-mode operation, enabling observation of high-frequency fluctuations in the HXR signal. A clear correspondence was observed between HXR and magnetic fluctuations, while directional differences were identified among forward-, backward-, and vertical- viewing configurations. The developed technique establishes high-frequency HXR fluctuation measurements as a new diagnostic of energetic- electron dynamics, opening a new experimental window into wave–particle interactions through direct measurements of energetic-electron fluctuations.続きを見る
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