Abstract. One of the most promising approaches to development of a 14 MeV neutron source dedicated to fusion material tests, is based on gas dynamic trap (GDT). It is especially advantageous in terms of the lower construction and operational costs, and low tritium consumption. The plasma parameters in the proposed GDT-based neutron source were numerically optimized to generate 2-4 MW/m2 flux of primary 14 MeV neutrons within 1-2 m2 testing zones. This requires to have the electron temperature 0.6-1 keV that has not been yet demonstrated in mirror mashies like GDT is. Therefore, other options have to be considered with lower electron temperatures, which closer to that experimentally achieved in mirror machines, but still are capable of generating the neutron flux of the order of 0.5 MW/m2 that is already of interest for many practical applications of the source. Further experiments to demonstrate possibility of an increase of the electron temperature in GDT towards that required in the neutron source are absolutely mandatory. The paper reviews different options for the parameter set of the neutron source and discuss a possibility of the electron temperature increase in the existing GDT device.