Definition of efficiency of initial injection part on stability of heavy-current REB propagating in gas volume of plasma-chemical reactor

The experimental results on determining the efficiency of the initial injection part conditions on the stability of the heavy-current relativistic electron beam (REB), propagating in the gaseous medium of the plasma-chemical reactor (PR), are presented. The REB with the electron energy Ee = 1 x 106 eV, the beam current Ib = 10-22 x 103 A and the pulse duration t = 60 x 10-9 s, generated at the Tonus accelerator, was injected into the air-filled reactor do 0.1 m in diameter. The reactor consisted of two sections with the corresponding lengths L1 = 0.3-1.0 m and L2 = 1.1-2.5 m, whereby the total length of the system did not exceed 3.5 m. The first section was filled with air under the pressure of P1 = 0.8-1.5 Torr whereas the air pressure in the second section varied within the range of P2 0.1-760 Torr. It is shown that the first section of the reactor produces the stabilizing effect on the REB with the current density up to 3 x 103 A/cm and makes it possible to achieve the effective length of the reactor second working section, filled with gas by different pressures