GB875574A - High voltage pulse transformer and a device for producing a pulsed beam of energetic electrons - Google Patents

Abstract

875,574. Transformers. UNITED STATES ATOMIC ENERGY COMMISSION. May 19, 1959 [June 24, 1958], No. 16928/59. Class 38 (2). [Also in Group XL (a)] A high-voltage pulse transformer enclosed in a vacuum tank 16 with an electron gun consisting of a cathode structure 14 (Fig. 2) and an accelerating electrode structure 15 has equal voltage increment tapping points on its stainless steel tube secondary winding 38 connected to the accelerating electrodes 46. The secondary winding 38 links with a number of rectangular laminated cores 23 arranged radially in circumferentially spaced relationship in two groups, the cores carrying parallel connected primary windings 36 formed of wide, thin strips arranged in concentric spirals. The tank 16 is provided with a pumping port 22 through which it is evacuated by a vacuum pump (not shown). The primary windings are fed with relatively lowvoltage pulses through coaxial connecters 37. The secondary winding has its lower end led out of the vacuum tank through an insulated feed-through arrangement 42 (Fig. 1, not shown) and its upper end terminates in a high-voltage shield cap 43. The secondary coils are insulated from the primary windings by closed shields 44 and the electron source 14 and accelerating electrode arrangement 15 are enclosed in a cylindrical conducting shield 62. A water-cooled anode grid 40 is mounted in the beam outlet aperture 21 and grounded to base 17. Cathode 57 may be made from a mixture of barium and strontium carbonates and nickel powder pressed on to a nickel backing plate and its heating filament 58 as well as extractor electrode 59 are supplied by bifilarly wound conductors 63, 64 which pass through the interior of the tubular secondary winding 38. Fig. 3 shows the supply arrangements in which repeated pulses are supplied to the primary windings through a switching device 68 controlled by trigger generator 69. The extractor electrode is connected to pulsed power supply 72 operated synchronously with trigger generator 69 both being pulsed during the zero current portions of the halfwave cycle of filament power supply 71 to prevent the magnetic field of the filament current affecting the electron beam. The impedance of the pulse line matches that of primary winding 36.