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    Bipolar crossed-field device including electromagnetic coils of the same polarity
    1.
    发明授权
    Bipolar crossed-field device including electromagnetic coils of the same polarity 失效
    双极交叉场设备包括极性相同的电磁线圈

    公开(公告)号：US4307317A

    公开(公告)日：1981-12-22

    申请号：US85577

    申请日：1979-10-17

    Applicant: Robin J. Harvey

    Inventor： Robin J. Harvey

    IPC: H01J17/00 ,  H01J17/14 ,  H01J1/50 ,  H01J23/10

    CPC classification number: H01J17/14 ,  H01J17/00 ,  H01J2893/0059

    Abstract: Bipolar crossed-field device 10 has outer electrode 12 and inner electrode 18 which define interelectrode space 16. Magnetic field coils 46, 48 operate together to form a magnetic field in the interelectrode space 16 shaped to trap electrons for cascading ionization and plasma formation when viewed from either electrode.

    Abstract translation: 双极交叉场设备10具有限定电极间空间16的外电极12和内电极18.磁场线圈46,48一起工作，以在电极间空间16中形成磁场，该空间16形成为捕获电子以进行级联电离和等离子体形成 从任一电极。

    Spark source with regulation of spark magnitude by control of spark timing
    2.
    发明授权
    Spark source with regulation of spark magnitude by control of spark timing 失效

    公开(公告)号：US4055783A

    公开(公告)日：1977-10-25

    申请号：US662891

    申请日：1976-03-01

    Applicant: John P. Walters ,  David M. Coleman

    Inventor： John P. Walters ,  David M. Coleman

    IPC: G01N21/67 ,  H01J17/00 ,  H03K3/55 ,  G01J3/30 ,  H05B7/20

    CPC classification number: H03K3/55 ,  G01N21/67 ,  H01J17/00 ,  H01J2893/0059

    Abstract: The disclosed spark source is adapted to generate electrical sparks to produce light for spectroscopic analysis of materials placed on the spark gap electrodes or introduced into the sparks. The disclosed spark source comprises a high voltage transformer having a secondary winding for supplying alternating current at a high voltage, a storage capacitor, a charging circuit including a rectifier connected between the secondary winding and the capacitor for charging the capacitor, spark gap electrodes having a spark gap therebetween, a discharge circuit including an electronic switching device connected between the capacitor and the spark gap electrodes for discharging the capacitor across the spark gap and control means for supplying a sequence of variably spaced triggering pulses to the input means of the electronic switching device for producing a sequence of spark cycles in which the capacitor is charged to substantially the same voltage for all of the spark cycles. During the intervals between sparks, the capacitor is recharged by the transformer and the rectifier. The timing of the sparks is varied, with reference to the phase angle of the alternating current, so that the capacitor is charged to the same voltage during each of the intervals between sparks. The timing of the sparks is computed to accommodate the variation in the instantaneous voltage developed by the transformer during such intervals. By varying the timing of the sparks, it is possible to vary the voltage to which the capacitor is charged, over a wide range. The electronic switching device may comprise a thyratron in parallel with a shunting diode, to carry the oppositely polarized half-cycles of the oscillatory capacitor discharge current. An inductance element may be connected in series with the thyratron to improve the commutation between the thyratron and the shunting diode. It is also advantageous to insert an inductance element in series with the shunting diode to bring about a further improvement in such commutation.

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