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1.
V. N. Manuilov T. Idehara M. Kamada T. Hayashi La Agusu T. Kanemaki K. Yatsui Wiehua Jiang 《International Journal of Infrared and Millimeter Waves》2006,27(3):343-353
High power Large Orbit Gyrotron (LOG) [1] is now under development at FIR FU. First version of this device was recently manufactured
and then assembled with power supply ETIGO-IV [2]. Results of preliminary tests of electron-optic system are presented. The
conditions when stable flat form of current pulse realized are discussed. Analytical estimations of cathode-anode distance
to achieve small influence of cathode plasma during high voltage (HV) pulse are performed.
Two new electron gun versions with decreased influence of the cathode plasma on its impedance and pulse form are suggested
and optimized. New optimal magnetic field distributions are found. First gun has quiasi-flat cathode configuration near the
anode diaphragm and provides operating current about 60 A. Second one uses blade cathode with operating current about 30 A.
Beam quality for both guns is suitable for LOG operation. 相似文献
2.
V. N. Manuilov T. Idehara M. Yu. Glyavin Information not available LaAgusu M. Kamada T. Kanemaki Wiehua Jiang K. Yatsui 《International Journal of Infrared and Millimeter Waves》2005,26(1):15-28
Short-pulse powerful Large Orbit Gyrotron with total electron energy about 400 kV and beam power in the cavity up to 100 MW is now under developing at FIR FU. Suitable for 200 ns pulse duration electron-optic system is analyzed. Results of numerical simulation for explosion emission cusp-type electron guns and magnetic field intensity about 8 T are presented. Sensitivity of the guns to small deviations from the nominal operating regime is investigated. Some versions of the gun with different accelerating potential as well as different beam current passing through the cavity (60-300A) are suggested. Current reduction simplifies the problems of mode competition and potential depression in the cavity, but at the same time decrease output power. To diminish current special diaphragms are suggested. Results of numerical simulation of collector corresponding to each version of the gun design including power density distributions along its surface are presented. It is shown that beam quality and collector regimes are suitable for LOG operation. 相似文献
3.
V. N. Manuilov T. Idehara T. Saito La Agusu T. Hayashi I. Ogawa 《International Journal of Infrared and Millimeter Waves》2008,29(12):1103-1112
High power short pulse gyrotron with operating frequency 395 GHz operating on the second cyclotron harmonic is now under developing
at FIR FU. The gyrotron is planned to use in future experiments for plasma diagnostics. For this purpose the output power
about 100 kW and pulse duration 100 ns at least are needed. Preliminary estimations of parameters of some versions of the
electron guns with accelerating potential U0 = 70-100 kV were performed. Possibilities of non-adiabatic as well as adiabatic guns were considered. It was shown that non-adiabatic
system is not reliable for such rather low value of U0, the adiabatic magnetron injection gun (MIG) is more preferable for the gyrotron design. Analytical estimations of the suitable
MIG dimensions and operating regime to form good quality electron beam were fulfilled. Numerical optimization of the gun shape
and position was performed. It was shown that in spite of the extremely big ratio of the operating current (I0 = 18 A) to the Langmuir current of the gun, close to 0.4-0.5, the suggested MIG can form the helical electron beam (HEB) which
is suitable for gyrotron operation properties. 相似文献
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随着自由电子激光器的发展,高亮度微波电子枪越来越受到重视,为满足北京自由电子激光器注入器的要求,高能所进行了国内首台热阴极微波电子枪的实验研究,采用单晶LaB_6做阴极材料。本文描述了在研制过程中所解决的阴极表面处理、夹持、加热等一系列工艺问题,首次采用电子束焊的方法将LaB_6与基金属牢固结合,最后给出实验结果:阴极发射密度可达84A/cm~2,阴极寿命200h,加热灯丝寿命大于500h。 相似文献
6.
横向运动对驻波加速管电子反轰的影响 总被引:1,自引:1,他引:0
驻波加速管的电子反轰除和各种纵向运动因素有关外,还和横向运动因素有关。本文分析了横向运动因素对电子反轰的影响,指出由于横向运动,最终作反向运动的电子只有一部分能反轰到电子枪阴极表面,本文给出了计算反轰束流包络、反轰率、反轰电流及反轰功率的方法。 相似文献
7.
根据现有磁体条件和工艺设计了一过渡区较长的倒向磁场系统,其主磁场为0.396 T,反向磁场为-0.033 T,并给出了一种实用8 mm三次谐波潘尼管电子枪的设计结果。该大回旋电子枪工作在43.5 kV,1.45 A下,阴极可置于轴向磁场幅值渐减区域。该结构电子枪不追求在通过反转点之前形成薄的环形电子束,不利用突变倒向磁场,不需要刻意控制磁力线与电子注包络走向的一致性,显著降低了调试的难度和要求。最终优化所得电子注的纵向速度零散为4.78%,偏心率为7.18%,速度比高达2.2,而速度比的零散仅为4.88%,满足三次谐波潘尼管的要求。经大信号模拟计算,在该电子枪驱动下,潘尼管器件功率可达31.9 kW,效率高达49.4%,总体参量仍具有吸引力且建立在可实现的电子光学系统基础上。 相似文献
8.
Experimental Study of the Plasma Cathode Electron Gun 总被引:1,自引:0,他引:1
Wenkai Xie Xiaoyun Li Lin Meng Yang Yan Xinyan Gao Shuo Chen Shenggang Liu 《International Journal of Infrared and Millimeter Waves》2002,23(8):1149-1158
The high-power microwave devices with plasma-filled have been unique properties. One of the major problems associated with plasma-filled microwave sources is that ions from the plasma drift toward the gun regions of the tube. This bombardment is particularly dangerous for the gun,where high-energy ion impacts can damage The cathode surface and degrade its electron emission capabilities. One of the techniques investigated to mitigate this issue is to replace the material cathode with plasma cathode. A unique plasma cathode electron gun are investigated in detail experimentally in this paper. The PCE-gun has been operated at pulser voltage up to 8KV,discharge current up to 166A,and pulse lengths of up to 60s. 相似文献
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Xiaowei Gu Lin Meng Yiqin Sun Xinhua Yu 《International Journal of Infrared and Millimeter Waves》2008,29(11):1032-1037
The high-power microwave devices with plasma-filled have unique properties. One of the major problems associated with plasma-filled
microwave sources is that ions from the plasma drift toward the gun regions of the tube. This bombardment is particularly
dangerous for the gun, where high-energy ion impacts can damage the cathode surface and degrade its electron emission capabilities.
One of the techniques investigated to mitigate this issue is to replace the material cathode with plasma cathode. Now, we
study the novel electron gun (E-gun) that can be suitable for high power microwave device applications, adopting two forms
of discharge channel, 1: a single hole channel, the structure can produce a solid electron beam; 2: porous holes channel,
the structure can generate multiple electronic injection which is similar to the annular electron beam. 相似文献
11.
本文对于在有磁场下多阳极电子鎗的电子注聚焦问题进行了理论分析。阴极处磁场可以具有任意屏蔽程度,得到了在加速场内描写电子轨迹的傍轴方程的解析解。在理论分析中,考虑了包括空间电荷效应的情况。 相似文献
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Saveliev Y.M. Spark S.N. Kerr B.A. Harbour M.I. Douglas S.C. Sibbett W. 《IEEE transactions on plasma science. IEEE Nuclear and Plasma Sciences Society》2000,28(3):478-484
Cathode plasma expansion into a vacuum gap is one of the major physical mechanisms affecting the relativistic magnetron (RM) performance and causing so-called RF pulse shortening. This paper will show how the development of new cathode technologies has led to a significant enhancement of the RM efficiency and power. We have conducted a series of experiments with various cathodes intended for use in RM's. A primary objective in this research was to determine how the cathode geometry and type of emission surface would influence major characteristics of the L-band high-power RM in a rising-sun configuration. In these experiments, the magnetron operated at a fixed frequency of 1.3 GHz, voltage of 100-500 kV, total electron current of 2-8 kA, and total microwave peak power of 100-700 MW depending on operating conditions and type of cathode used. It was found that the geometry (smooth cylindrical, series of disks, pins) and the type of cathode emission surface (stainless steel, velvet, carbon fibers) affected the magnetron performance. This process resulted in a variation of the maximum microwave power of ~30%. The cathode end caps, which have been mostly abandoned after transition from classic to RM's, were shown to be able to increase the microwave power and RM efficiency by ~80% without facilitating the pulse shortening effect. This result was achieved through the implementation of cathode design principles that are compatible with the operation of RM's. A maximum total efficiency of 24% was achieved with a velvet cathode with end caps, determined as the ratio of peak power to input electrical power 相似文献
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Computer Simulation of Axis-Encircling Beams Generated by an Electron Gun with a Permanent Magnet System 总被引:1,自引:0,他引:1
S. Sabchevski T. Idehara I. Ogawa M. Glyavin S. Mitsudo K. Ohashi H. Kobayashi 《International Journal of Infrared and Millimeter Waves》2000,21(8):1191-1209
Results from computer aided design of a novel electron gun generating axis-encircling beams are presented and discussed. Numerical experiments were performed by the new version of the software package GUN-MIG named GUN-MIG/CUSP. It is based on a self-consistent relativistic model and is developed as a problem oriented tool for analysis of electron-optical systems with magnetron injection guns (MIG) and electron guns with field reversal (cusp guns), forming axis-encircling beams. As a result of the simulations an electron-optical design of a novel electron gun with permanent magnet system was accomplished. The gun is expected to form high quality beams with small velocity spread and beam ripple. Parameters of the generated beams are appropriate for a prospective weakly relativistic high harmonic large orbit gyrotron (LOG). The development of such device is in progress now at the Research Center for Development of Far-Infrared Region (FIR Center) at Fukui University. 相似文献
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Numerical Analysis of Weakly Relativistic Large Orbit Gyrotron with Permanent Magnet System 总被引:1,自引:0,他引:1
M. Glyavin S. Sabchevski T. Idehara I. Ogawa S. Mitsudo K. Ohashi H. Kobayashi 《International Journal of Infrared and Millimeter Waves》2000,21(8):1211-1221
High-harmonic gyro-devices with axis-encircling electron beams known as large orbit gyrotrons (LOG) represent an appealing alternative to the conventional gyrotrons. In this paper we investigate the feasibility of such device operating with low current and low energy electron beams formed by a novel electron gun with a permanent magnet system. The results from the numerical experiments indicate the possibility to excite TE41 mode at fourth harmonic of the cyclotron frequency. Simulations predict generation of microwave radiation with frequency 104 GHz and output power near 1 kW. 相似文献
18.
由于空间电荷效应的限制,产生百飞秒的极短电子脉冲是超快电子衍射技术的一大难点.同时,电子的穿透深度随着电子能量的增加而增加,而电子的散射几率却具有相反的规律.因而,除了时间分辨的提升,还需要可宽范围调节的电子能量以优化不同厚度样品对其的需求.基于此,提出并设计了一种新型超紧凑电子枪,结合均匀场阴极和可移动阳极的配置,可在10-125 kV加速电压范围内实现100 fs量级时间分辨率.通过优化设计高压电极轮廓,使得其轴上和整个阴极面的场增强因子在不同阴阳极间距下均小于约4%,从而保证了不同加速电压下最大轴上场强均可达10 MV/m量级,有效地抑制了电子脉冲的展宽效应;进一步将阳极小孔设计成可放置致密电镜载网的阶梯孔,一方面可将载网支撑的样品紧贴小孔后方放置,最大程度上缩短了电子从阴极到样品的时间弥散,同时也可以有效地减弱阳极孔对电子束的散焦效应,提升电子束的横向聚焦性能. 相似文献
19.
给出一台脉冲间隔100~1 000 ns、脉冲数2~5个、二极管电压3 MV、引出束流强度2.5 kA的猝发多脉冲电子束源的物理设计及初步调试结果。在设计中,采用感应叠加和阻抗匹配方案获得二极管高电压脉冲;试验中分别采用天鹅绒和大发射面储备式热阴极获得猝发多脉冲电子束。调试结果表明:采用大发射面热阴极可避免阴极等离子体产生,确保二极管在猝发多脉冲状态下稳定运行。初步调试获得大于2.7 MV猝发三脉冲二极管高压,并获得1.6 kA的三脉冲电子束流。 相似文献