摘要:
迴旋管实现永磁包装,迄今尚未见有文献报道。本文提出采用一种适合于迴旋管工作的双均习区径向磁路系统作为永磁聚焦方案,并利用计算机进行了研究,通过设计计算,选用磁能积(BH(max)为20 MGOe的钐钴磁钢。为了调整磁场,在双均匀区添加了一些小电磁线包,它们改变磁场的范围约为5％。 通过计算表明,建立一个8 mm二次谐波迴旋管所需的65007000Gs强磁场系统,约需钐钴磁钢4050kg。这对于研制 8 mm二次谐波永磁聚焦迴旋管以及近厘米波段迴旋管是很吸引人的。本文最后还对提高磁路效率、扩大均匀区等问题进行了简单的讨论。
Abstract:
A new PM-focusing system with two regions of uniform magnetic field, suitable for gyrotron is proposed and studied with computer. In the calculation, a radial system made of Sm-Co magnets is used. The maximum magnetic energy-products (BH)max of the magnets are about 20MGOe. In order to adjust the magnitude of the magnetic field, some small coils are inserted into the two regions so that about five percent field change can be obtained.As a computed example a 40-50 kg Sm-Co PM-focusing system for an 8 mm band H02 mode gyromonotron operating at secondary harmonic of the cyclotron frequency is needed to obtain an intense magnetic field of 6500-7000 Gs. This is very atteractive for the development of 8 mm band gyrotrons and near-centimetre band ones. In the last part of the paper some problems such as the extension of the uniform region and increasing the efficiency of magnetic circuit are briefly discussed.
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