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    • 122. 发明专利
    • ION SOURCE
    • JPH03257747A
    • 1991-11-18
    • JP5367890
    • 1990-03-07
    • HITACHI LTD
    • MATSUO HISAHIDESAKUMICHI KUNIYUKITOKIKUCHI KATSUMISEKI TAKAYOSHIIGA TAKASHI
    • H01J27/14H01J37/08
    • PURPOSE:To always obtain a stable ion beam for various operating conditions without regard to or not to use an exciting coil as a magnetic field generating means by providing a magnetic substance driving mechanism able to adjust the magnetic field intensity or distribution in a discharge chamber. CONSTITUTION:Microwaves generated in a microwave generating source and passed through a wave guide 2 are introduced into a discharge chamber 1 constructed between discharge electrodes 5, 5 through a dielectric 4 such as boron nitride placed in vacuum, to generate a strong microwave electric field. In addition, in order to apply a magnetic field perpendicular to the microwave electric field in the discharge chamber 1, permanent magnets 7 are provided outside of the discharge chamber 1. Here, a magnetic substance driving mechanism 11 is provided to enable to control positions of the permanent magnets 7 from outside. Thereby even when no exciting coil is used, the magnetic field intensity or distribution in the discharge chamber 1 can be adjusted to obtain a stable ion beam.
    • 126. 发明专利
    • CHARGED PARTICLE SOURCE
    • JPS63213248A
    • 1988-09-06
    • JP4255787
    • 1987-02-27
    • HITACHI LTD
    • SAKUMICHI KUNIYUKITAMURA HIFUMI
    • H01J3/02H01J27/26H01J37/073H01J37/08
    • PURPOSE:To make a pulse focusing beam of a C Hz band to be produced without expanding an energy width by generating a standing wave with a mechanical vibration wave sent to a liquid material covering a needle-state electrode, periodically changing a shape of a charged particle radiant point, and periodically changing on electric field strength of the radiant point. CONSTITUTION:A liquid material 2 adhered to the surface of a needle-state electrode 1 is made to a conical shape by a static electricity strength by an electric field produced by the electrode 1, an auxiliary electrode 5, and drawer type electrode 6 in which a suitable electric potential is impressed respectively. When an oscillator 8 is driven in the condition, a mechanical vibration wave is produced in the material 2, and standing waves 3 and 4 are generated. In this case, a wave length and shape of the standing wave change by a driving frequency and a surface tension or density of the material 2. This causes a radius of curvature of the tip to be periodically changed also an electric field strength to be periodically changed, and the use of a ultrasonic oscillator as an oscillator for giving a mechanical vibration enables a pulse from several K Hz to several G Hz to be produced.