| 摘要 |
PURPOSE:To facilitate the impression of an axial asymmetric magnetic field to a collector and to restrain the flow of backward electrons to a delayed wave circuit and thereby to obtain a traveling-wave tube with high efficiency and high reliability, by a method wherein magnetic pole pieces made of iron or nickel or the like are hermetically sealed and fixed by fusing or the like to the two slit places of the collector so that said magnetic pole pieces project from the inside and outside of the circumference of the collector. CONSTITUTION:A collector 5 is made of non-magnetic material (for instance: copper), at a part on the external surface of the collector 5 the slits are grooved at two places in parallel with the direction of an electron beam axis, and magnetic iron pieces 15 and 16 made of iron or nickel are fixed to and sealed in the slit parts. The magnetic field intensity 19 is proportional to the thickness and the length of a permanent magnet 18 and the lengtn of the projected part of magnetic pole pieces 15 and 16 in the collector 5, therefore said intensity is variable for a wide range by adjusting those dimensions. The ratio (d2/d1) of the inside diameter d2 of the collector to the inside diameter d1 of the collector inlet can be enlarged enough, so the collector structure can be made to be an ideal Faraday cage style. |
