| 摘要 |
PCT No. PCT/DE80/00086 Sec. 371 Date Feb. 8, 1982 Sec. 102(e) Date Feb. 8, 1982 PCT Filed Jun. 7, 1980 PCT Pub. No. WO81/03579 PCT Pub. Date Dec. 10, 1981.Apparatus for generating and controlling an electron gun in a vacuum envelope comprising, a cathode, means for controlling the temperature of the cathode to control its current emission, an auxiliary electrode with an aligned opening mounted adjacent to said cathode and with the electron beam from the cathode passing through said aligned opening, means for maintaining the voltage of said auxiliary electrode slightly more negative than said cathode, and an annular anode mounted in a spaced relationship from said cathode and said auxiliary electrode. |
