Development of a D-D neutron spectrum detector based on helium-3 proportional counter.

Deuterium-deuterium (D-D) neutron spectrum diagnostics in tokamaks are a challenging task with current technologies. To address this issue, we designed and tested a fast and compact helium-3 proportional counter with a diameter of 2.5 cm and an effective length of 15 cm and using Kr as a stopping gas.

Hard x-ray spectrometer with high time and energy resolution on HL-2A tokamak.

A hard x-ray spectrometer based on a φ25 × 25 mm LaBr scintillator has been developed to measure the runaway electron bremsstrahlung. Simulation results by GEANT4 show that x rays with an energy of 15 MeV can be effectively detected. In order to tolerate a high count rate, a self-made fast shaping amplifier is used to process the detector output into a fast bipolar pulse.