The design and performance of the gun are discussed. Studies of small versions of the gun with a beam area of 1500 mm*30 mm provide design data for devices with beams covering 1 m in length and 25-100 mm in width. At beam energies up to 160 keV, the current density range is 1-2000 A m^-2 and pulse lengths vary from 100 to 10 mu s. Main features which contribute to the convenient use of these guns are the robust, demountable accelerating stages and the auxiliary discharge system.