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使用电子在静磁场和时变横电场中的朱洛可夫斯基运动方程,推导出一束电子注当其通过一个横电场沿轴向具有一次或多次半波长正弦变化的TE模腔体时的互作用阻抗。用类似的方式推导了由漂移管分隔开的TE模腔体组成的回旋速调管的跨导表达式。这个表达式包含相对论修正,这种修正在电压高于50千伏时是很重要的,然而,所得结果与赫希菲尔德等人在低电压时得出的相一致。此外发展了一种分析TE_(o,n)模腔体和空心电子注的回旋速调管的小信号空间电荷理论。它表明,在只有空间电荷场和静磁场作用的漂移空间内电子注的调制按指数增长。用电子注负载跨导和空间电荷理论来表示回旋振荡管和回旋速调管在电子弹道理论(EBT)中的稳定性和增益。工作在80千伏管子,在28千兆赫产生250千瓦功率。 相似文献
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本文讨论了回旋中心法的物理基础及其所揭示的在回旋脉塞中所发生的物理现象。根据上述讨论证明了这一理论的优越性。文中还指出了万遂人(1985)文章中存在的一些问题。 相似文献
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针对谐波回旋管互作用效率低的问题, 以自洽非线性理论为基本工具, 系统地分析了三个关键因素, 即互作用腔体长度(Q值)、电子注的横纵速度比和工作电压对二次谐波互作用系统性能的影响.研究发现当工作磁场选择在硬激发区时, 通过综合调节电子注的横纵速度比和工作电压能够获得较高的互作用效率.基于自洽非线性理论优化设计了一个W波段二次谐波回旋振荡器, 粒子模拟(PIC)结果显示当电子注速度离散3%, 工作电压37 kV, 电流4 A时, 输出效率达到了39.5%. 相似文献
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本文考虑了电子注厚度及交、直流空间电荷效应以后,对静电电子回旋谐振脉塞(EECRM)进行了理论分析,并讨论了其特性的变化情况。 相似文献
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小回旋三次谐波0.52 THz回旋管 总被引:2,自引:1,他引:1
为了发展大功率高效率太赫兹辐射源,对小回旋电子注激励三次谐波太赫兹电子回旋脉塞进行了研究,分析了不同参数情况下的模式竞争.研究结果表明,采用近轴小回旋电子注能够实现三次谐波单模振荡.在此基础上设计了一只0.52 THz、TE37模三次谐波回旋管,数值计算表明,该回旋管在工作磁场为6.98 T下输出功率可以达到3.7 kW.对产生近轴小回旋电子注的高磁压缩比磁控注入式电子光学系统进行的粒子模拟研究结果表明,该电子枪能够产生满足实验要求的65 kV/2.5 A,横纵速度比为1.24,引导中心半径0.35 mm的小回旋电子注,其纵向速度离散6.6%,横向速度离散6.1%. 相似文献
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通过耦合系数、模式竞争和起振条件分析谐波状态下采用大回旋电子注周期性介质加载结构的注波互作用特点,并通过理论分析和PIC粒子模拟,优化设计出一支Ka波段大回旋电子注回旋行波管。该回旋行波管处于二次谐波工作状态,互作用结构采用周期性介质加载结构,结构简单,工艺成熟。仿真结果表明,在电子注为75 kV、电流为9 A、磁场强度仅为0.51 T的工作条件下,所设计的回旋行波管最大输出功率达到了156 kW,3 dB带宽为4.4 GHz,最大增益为47.18 dB,磁场用常规电磁线圈磁体产生即可达到要求。 相似文献
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为减少太赫兹回旋器件模式密度和降低模式竞争问题,利用具有模式选择特点的共焦波导结构作为140 GHz回旋行波管(Gyro-TWT)的高频互作用系统。在理论分析基础上,建立注波互作用计算模型并对其进行数值计算;通过对共焦波导高频场分布、衍射损耗、耦合系数以及注波互作用效率等输出参量的分析,选择HE06作为工作模式,确定了140 GHz Gyro-TWT放大器的基本结构和工作参数,并利用注波互作用非线性理论进行分析。模拟结果表明:在注电压为35 kV,注电流2 A,速度比为0.75时,该高频结构在140 GHz频点获得12 kW峰值输出功率,17.1%电子效率和38 dB饱和增益,3 dB带宽达到6 GHz。 相似文献
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太赫兹回旋管是一类基于电子回旋受激辐射机理的快波器件,同时也是目前最具发展前景的高功率太赫兹辐射源.本文根据回旋管的线性理论和自洽非线性理论对三次谐波、工作频率0.6 THz的回旋管进行了研究,重点讨论了引导中心分别为0mm的实心回旋电子注和0.315mm的空心回旋电子注的模式竞争.通过分析比较,发现工作在0.6THz 、三次谐波的众多模式中TE37模是一比较理想的工作模式,它不仅有相对较高的功率输出,而且还有相对较少的模式竞争.本文中的设计采用55kV/1.0A,电子注的速度横纵比为1.5,在工作磁场7.86T下,数值计算结果表明输出功率达4.73kW. 相似文献
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The commenter remarks on a statement in the above-titled work by Y. Sato et al., (ibid., vol.5, no.4, pp.329-336, Nov. 1992) concerning a study that the commenter co-authored (M.E. Mack et al., 1985). The statement is that the latter work suggests that beam blowup resulting from wafer charging does not disturb dose control of adjacent wafers in the vicinity of the charging wafer, unlike their own observations. The commenter clarifies this work and argues that the gross dose errors reported by Y. Sato et al. are caused by blowup of the beam through loss of space-charge neutralization over at least 1-m distance. He points out that the use of the flood gun with biased aperture ameliorates the problem. The original authors respond by defending their results 相似文献
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Nakano H. Yamamoto Y. Seto M. Hitosugi K. Yamauchi J. 《Antennas and Propagation, IEEE Transactions on》2004,52(12):3237-3244
This work presents a half-moon antenna (HMA), which is composed of two semi-circular top and bottom conducting plates joined by a rectangular conducting plate. The HMA has a wide radiation beam. Radiation in the y-z plane (in the E plane) is hemispherical with a half-power beam width (HPBW) of more than 200/spl deg/. Radiation in the x-y plane (in the H plane) forms a sector beam with an HPBW of more than 100/spl deg/. To reduce the backward radiation and improve the gain, chokes are added to the HMA. An increase in the gain of approximately 1 dB is obtained. In order to obtain a tilted beam, the radius of the bottom plate is reduced. The maximum beam direction of the tilted beam /spl theta//sub max/ is not sensitive to frequency. Within a frequency range of 11 to 14 GHz (24%), /spl theta//sub max/=167/spl deg//spl plusmn/2/spl deg/. The gain is found to be G=9.5/spl plusmn/0.5 dBi within this same frequency range. 相似文献
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Optical recording systems capable of information storage and retrieval, using a highly focused laser beam as the recording and playback source, have been developed to a point where product introduction in the 1983-1985 time frame is highly probable. The product protentials range from low-data-rate (10-20 Mbits/s), single disk (1010to 1011bits), random-access electronic office filing cabinets (augmenting existing word processing units) to high-date-rate (hundreds of megabits per second), multidisk (1013bits on line "jukeboxes"), random-acess archival mass memories. This article presents the basic features of these optical disk data storage and retrieval systems with particular emphasis on the recording source and recording media. 相似文献
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V. S. Andrushkevich Yu. G. Gamayunov E. V. Patrusheva 《Journal of Communications Technology and Electronics》2010,55(3):330-336
A model and a system of equations for investigation of the nonlinear regime of a clinotron are presented. Calculations are
performed and physical interpretation of obtained results and specific features of manifestation of the clinotron effect for
different sheet beam thicknesses and inclination angles to the surface of the slow-wave system is given. The universal dependence
of the maximum efficiency and optimal inclination angle in the clinotron on the beam thickness is found. It is demonstrated
that, for the optimal beam thickness and inclination angle, the clinotron efficiency considerably exceeds the efficiency of
a standard backward wave tube (BWT) for the same electron beam parameters. 相似文献
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雷达工作时,传统的波位编排因为规则单一,容易被电子战系统截获和识别。针对此问题,提出了一种低截获概率的波位编排方法。首先介绍了传统的区域扫描和定点跟踪的波位编排模式,然后讨论了交错及低损耗点的低截获概率波位编排方法,给出了波位编排的实现流程并分析了任务性能和低截获性能。仿真实验验证了所提方法的有效性。 相似文献
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一种对温度不敏感的光纤布拉格光栅加速度计 总被引:2,自引:2,他引:0
提出了一种新型的基于光纤布拉格光栅(FBG)反射带宽和反射光功率测量的加速度计,其是将单根FBG斜向粘贴在矩形简支梁侧面构成的,通过在简支梁中间粘贴重物感应竖直方向的加速度,通过梁的弯曲改变FBG反射带宽和反射光功率。实验结果表明:FBG的反射带宽具有很好的线性响应,其测量范围可达到8g,因带宽展宽造成FBG的反射率降低,因此反射光功率的线性响应范围只有4g;带宽和功率灵敏度分别为0.4nm/g和4.57μW/g;由于温度仅改变FBG的布拉格波长,而对其反射带宽和光功率几乎没有影响,所以加速度计对温度变化不敏感。 相似文献
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Q. Md. Alfred T. Chakravarty G. Singh S. K. Sanyal 《Journal of Infrared, Millimeter and Terahertz Waves》2008,29(3):249-260
In this article, a simple and efficient technique for the wideband shaped beam and sector beam pattern generation with their adaptive interference rejection is proposed. A microcontroller controlled and time delay based beam forming network for simultaneously generating multiple beams, shaped beam and sector beam is conceptualized. The antenna patterns considered here is formed by linear array of isotropic elements grouped as subarray. The shaped and sector beam synthesis procedure is practically simplified by simultaneous adding the constituents beams from the subarrays, was theoretically established by Woodward and Lawson (Proc. IEE. 95(1):362–370, 1948). Apart from the shaped beam generation a technique for adaptive interference rejection in shaped patterns using combination of time delay and phase shifter is discussed. This topic promises good prospect for wideband pattern generation and interference rejection. 相似文献