| 摘要 |
In an ion laser generator, an electromagnet must produce a sufficiently strong magnetic field throughout the length of the bore where plasma must be converged, and the magnetic field intensity at the end surface of the cathode must not exceed a certain limit. If the magnetic field intensity at the cathode is too strong, the plasma is converged on an area of the cathode and destroys the cathode at the area. A magnetic shield member is provided at an end surface of the electromagnet facing to the cathode for shielding the cathode surface from the leakage flux.
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