A high harmonic gyrotron with an axis-encircling electron beam and a permanent magnet
A high harmonic gyrotron with an axis-encircling electron beam and a permanent magnet
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DOI：
10.1109/tps.2004.827614
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发表时间：
2004-08
影响因子：
1.5
通讯作者：
T. Idehara;I. Ogawa;S. Mitsudo;Y. Iwata;S. Watanabe;Y. Itakura;K. Ohashi;H. Kobayashi;Tomonori Yokoyama;V. Zapevalov;M. Glyavin;A. Kuftin;O. Malygin;S. Sabchevski
中科院分区：
文献类型：
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作者：
T. Idehara;I. Ogawa;S. Mitsudo;Y. Iwata;S. Watanabe;Y. Itakura;K. Ohashi;H. Kobayashi;Tomonori Yokoyama;V. Zapevalov;M. Glyavin;A. Kuftin;O. Malygin;S. Sabchevski
带有绕轴电子束的回旋管能够高频工作，因为即使在电子回旋频率的高次谐波下也能保持高的束流效率。我们已经设计并建造了这样一台带有永久磁铁的回旋管。回旋管已经在三次、四次和五次谐波下成功运行。频率分别为89.3千兆赫、112.7和138千兆赫，对应的腔模为TE/SUB311/、TE/SUB411/和TE/SUB511/。该永磁体系统相当新颖，由许多NbFeB制成的磁体元件和用于控制腔体和电子枪区场强的附加线圈组成。腔区磁场可在0.97~1.18T之间变化，在磁场强度下，三次和四次谐波的输出功率分别为1.7和0.5kW。回旋管是脉冲的，脉冲长度为1ms，重复频率为1 Hz。束流电流为1.2-1.3A，束流能量为40千伏，并测量了束流效率和发射模式。本文描述了回旋管的实验结果，并与计算机模拟结果进行了比较。
A gyrotron with an axis-encircling electron beam is capable of high-frequency operation, because the high-beam efficiency is kept even at high harmonics of the electron cyclotron frequency. We have designed and constructed such a gyrotron with a permanent magnet. The gyrotron has already operated successfully at the third, fourth, and fifth harmonics. The frequencies are 89.3, 112.7, and 138 GHz, respectively, and the corresponding cavity modes are TE/sub 311/, TE/sub 411/, and TE/sub 511/. The permanent magnet system is quite novel and consists of many magnet elements made of NbFeB and additional coils for controlling the field intensities in the cavity and electron gun regions. The magnetic field in the cavity region can be varied from 0.97 to 1.18 T. At the magnetic field intensities, the output powers at the third and the fourth harmonics are 1.7 and 0.5 kW, respectively. The gyrotron is pulsed, the pulse length is 1 ms and the repetition frequency is 1 Hz. The beam energy is 40 kV and the beam current is 1.2-1.3 A. Beam efficiencies and emission patterns have also been measured. In this paper, the experimental results of the gyrotron are described and compared with computer simulations.