A highly efficient neutron time-of-flight detector for inertial confinement fusion experiments

We have developed the highly efficient neutron detector system MANDALA for the inertial-confinement-fusion experiment. The MANDALA system consists of 842 elements plastic scintillation detectors and data acquisition electronics. The detection level is the yield of ${\text{1.2×10}}^5$ for 2.5 MeV and ${\text{1×10}}^5$ for 14.1 MeV neutrons (with 100 detected hits). We have calibrated the intrinsic detection efficiencies of the detector elements using a neutron generator facility. Timing calibration and integrity test of the system were also carried out with a ${}^{\mathrm{60}}\mathrm{Co}$ γ ray source. MANDALA system was applied to the implosion experiments at the GEKKO XII laser facility. The integrity test was carried out by implosion experiments.