Proton recoil telescope based on diamond detectors for measurement of fusion neutrons

摘要

Diamonds are very promising candidates for the neutron diagnostics in harshenvironments such as fusion reactor. In the first place this is because oftheir radiation hardness, exceeding that of Silicon by an order of magnitude.Also, in comparison to the standard on-line neutron diagnostics (fissionchambers, silicon based detectors, scintillators), diamonds are less sensitiveto $\gamma$ rays, which represent a huge background in fusion devices. Finally,their low leakage current at high temperature suppresses the detector intrinsicnoise. In this talk a CVD diamond based detector has been proposed for themeasurement of the 14 MeV neutrons from D-T fusion reaction. The detector wasarranged in a proton recoil telescope configuration, featuring a plasticconverter in front of the sensitive volume in order to induce the (n,p)reaction. The segmentation of the sensitive volume, achieved by using twocrystals, allowed to perform measurements in coincidence, which suppressed theneutron elastic scattering background. A preliminary prototype was assembledand tested at FNG (Frascati Neutron Generator, ENEA), showing promising resultsregarding efficiency and energy resolution.