Device and method for generating high-throughput plane light source

The invention provides a device and a method for generating a high-throughput plane light source. An electrode of the device consists of a cylindrical anode and a round bar-shaped cathode in coaxial arrangement with the cylindrical anode, wherein one end of an anode cylinder is sealed, the other end of the anode cylinder is a quartz transmission window air seal, the wall surface of the anode cylinder positioned near the transmitting end surface of the cathode is provided with a high-temperature gas flowing-out hole seam, the anode cylinder wall surfaces at two sides are provided with cold gas flowing-in hole seams, high-pressure inert gas is filled in the anode cylinder, an axial magnetic field is exerted in the anode cylinder, a direct current constant current power supply is exerted between the anode cylinder and the cathode, and electric arcs are ignited between the transmitting end surface of the cathode and the inner wall surface of the anode cylinder. The generating method has the advantages that through the magnetic field, the electric arcs are driven to rotate, gas is driven to flow and organize, the electric arc plasma configuration, the cathode arc root and the anode arc root configuration are controlled, and the plasma configuration is changed into a round disc shape from a bell jar shape of a short-arc xenon lamp. The expansion of plasmas in the axial direction is limited, the radial current density is improved, and the luminous power and the luminous efficiency are enhanced.