A detector of 3.02-MeV protons and 2.45-MeV neutrons is designed for experi
ments with the injection of deuterium atomic beams in a Gas-Dynamic Trap fa
cility. An organic scintillator and a phototube with a fine-mesh dynode sys
tem are used in the sensor. The detector is operated in the mode of single-
particle counting; the time resolution is similar to 20 ns. Discrimination
between different particles is effected by using a controlled damper that s
huts off the proton flow and also by analyzing pulse-height spectra. The se
nsor is inserted in a vacuum chamber; the rotating mechanism of the sensor
and location of the ports in the facility enables measurements along the pl
asma column.