NONLINEAR-ANALYSIS OF HIGH-HARMONIC SLOTTED GYRO-TWT AMPLIFIER

被引:32
作者
CHONG, CK
MCDERMOTT, DB
BALKCUM, AJ
LUHMANN, NC
机构
[1] Department of Electrical Engineering of California at Los Angeles, Los Angeles, CA
关键词
D O I
10.1109/27.142818
中图分类号
O35 [流体力学]; O53 [等离子体物理学];
学科分类号
070204 ; 080103 ; 080704 ;
摘要
A nonlinear self-consistent simulation code is employed to investigate the behavior of the slotted gyrotron traveling-wave amplifier (gyro-TWT), in which an axis-encircling electron beam synchronously interacts with a high-order azimuthal mode in a magnetron-type waveguide. The efficiency of a fourth-harmonic device with an ideal 60 kV, 5 A beam is shown to reach 30% for alpha = upsilon perpendicular-to /upsilon(z) = 2. The growth rate for the pi-mode is roughly 25 % larger than for the 2-pi-mode. The efficiency increases for lower voltage and the device is found to be moderately sensitive to the radial spread of the beam's guiding center position and extremely sensitive to the axial velocity spread. For an ideal 60 kV, 5 A beam with alpha = 1.5, the efficiency of a second-harmonic gyro-TWT is 42% and falls to 10% for an eighth-harmonic device. The design of a 35 GHz, 60 kV, 5 A, alpha = 1.5, eight-vane, fourth-harmonic gyro-TWT with 7% axial velocity spread is presented. It is predicted that this design will yield a peak output power of 90 kW, a peak efficiency of 30% and 6.3% saturated bandwidth.
引用
收藏
页码:176 / 187
页数:12
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