Fig. 2

Average neutron ToF signals measured by PMTs after X-ray subtraction at ion temperatures of a 60 keV, b 80 keV, and c 100 keV. The red and blue solid lines show the averaged PMT signals with and without the CD₂ target, respectively. Black solid vertical lines indicate the ToF of 2.45 MeV fusion neutrons, while black dashed vertical lines indicate the corresponding ToF window due to Doppler broadening. Red dashed vertical lines represent the extended time window due to the CD₂ target. Time zero corresponds to the onset of X-ray emission.