| 摘要 |
PURPOSE:To constrict a charge current near a cathode, alleviate an ion impact against a plasma capillary, and restrain the insulation from deteriorating and an output from decreasing so as to improve a device of this design in reliability by a method wherein a convergent magnetic field device is provided, where a magnetic field is especially intensified near a cathode. CONSTITUTION:A convergent magnetic field device consisting of a first electromagnet 7 and a second electromagnet 8 is provided to the outside of an ion laser tube 1 to generate a magnetic field. The coil of the second electromagnet 8 provided near a cathode 3 is made more than that of the electromagnet 7 in number of turns so as to generate a stronger magnetic field to constrict a charge current more tightly. By these processes, an ion impact against the end faces of graphite disks 4a-4h can be alleviated, the spatters of the disks are prevented from absorbing gas inside the tube, and the insulation between an anode and the cathode is restrained from deteriorating, so that a device of this design can be improved in reliability and lengthen in the span of life. |
