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    • 22. 发明专利
    • ION SOURCE
    • GB1510203A
    • 1978-05-10
    • GB2659975
    • 1975-06-23
    • SHARP KK
    • H01J27/02H01J27/22H01J3/04
    • 1510203 Ion sources SHARP KK 23 June 1975 [21 June 1974 22 Oct 1974(2)] 26599/75 Heading H1D An ion source comprises a cathode 42 through which a discharge gas is introduced and an anode 43 of spiral construction, an electric field being established in use between the anode and cathode and a magnetic field being produced by current flow through the anode, the two fields being orthogonal thereby dispensing with the usual surrounding magnetic coil. An alternative cathode shape is a planar spiral interleaved with a planar spiral anode with a cathode current direction to provide a further magnetic field in the same direction as that caused by the anode current, Figs. 1 and 2 (not shown). In Fig. 3 (not shown) a similar arrangement of interleaved anode and cathode spirals are in the form of a constricted cylinder. In Fig. 4 (not shown) anode and cathode segments are arranged alternately and external connecting wires provide a spiral configuration. In Fig. 5 (not shown) a stack of planar spiral anode-cathode structures is used. In Fig. 6 (not shown) a plurality of anode-cathode structures is arranged over an imaginary curved surface to provide high beam intensity. An extraction and focussing electrode comprising a helically wound wire to which a potential is applied and through which a current passes having a cylindrical portion and a conical portion adjacent the exit aperture of the ion source is described with reference to Fig. 8 (not shown). Additional excitation may be provided by microwave or laser radiation enabling cyclotron resonance of electrons emitted from the cathode to be achieved.