Аннотация:A new gaseous annular sectional thermalneutron detector for the new neutron diffractometer at
the IBR2 reactor has been designed and manufactured atthe Frank Laboratory of Neutron Physics of the
Joint Institute for Nuclear Research (JINR). The detector is designed to study smallvolume samples at high pressure and consists of 16 sections, each one of which is divided into six independent detector elements.
We present the main design features of the detector, detecting electronics, dataacquisition and visualization software, and software system for experiment management. The results of the first neutronographic experiments that were carried out with the use of the detector are also presented.