Физические особенности формирования плазмы в протяженном полом аноде импульсного несамостоятельного дугового разряда

Abstract

The paper investigates the characteristics of a pulsed arc discharge of low (≈ 1 Pa) pressure with thermal emission and hollow cathodes in an argon atmosphere. It is shown that a pulsed discharge is stably initiated in an extended, 1.2 m long and 0.6 m in diameter, hollow anode with a volume of about 0.3 m3 at increased (100-300) V combustion voltages and allows reaching currents up to 800 A with a pulsed with a capacity of up to several tens of kilowatts. An increase in the combustion voltage of the discharge from 100 to 300 V leads to a decrease in the inhomogeneity of the plasma concentration distribution over the height of the hollow anode by more than an order of magnitude. An increase in the value of the induction of the axial magnetic field due to an increase in the magnetic coil current from 0.2 to 2 A leads to an increase in the non-self-sustained arc discharge current by 20% at an increased (300 V) discharge voltage.