共查询到17条相似文献,搜索用时 15 毫秒
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T. Idehara T. Saito H. Mori H. Tsuchiya La Agusu S. Mitsudo 《International Journal of Infrared and Millimeter Waves》2008,29(2):131-141
Long pulse operation up to 1 msec of a high frequency gyrotron with a pulse magnet has been successfully carried out in a
frequency range including 1 THz. In the experiments, the timing of an electron beam pulse injection is adjusted at the top
of the magnetic field pulse, where the variation of field intensity is negligible. The operation cavity modes seem to be TE1, 12 and TE4,12 at the second harmonics. The corresponding frequencies are 903 GHz and 1,013 GHz, respectively. Additionally several features
of radiation measurement results of the gyrotron are described and brief considerations are presented. 相似文献
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O. Dumbrajs La Agusu T. Idehara 《International Journal of Infrared and Millimeter Waves》2006,27(9):1159-1171
Influence of magnetic field tapering on operation of a gyrotron working in the TE
4,12 mode at the second harmonic frequency 1013.67 GHz is investigated. It is found that the existing inhomogeneity of the magnetic
field of the order of 0.25%–0.50% in the cavity allows one to achieve higher efficiencies. It improves also mode competition
scenario by suppressing oscillations of the two parasitic TE
3,6+ and TE
5,5− modes at the fundamental frequencies 513.35 GHz and 503.64 GHz, respectively. 相似文献
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La Agusu T. Idehara H. Mori T. Saito I. Ogawa S. Mitsudo 《International Journal of Infrared and Millimeter Waves》2007,28(5):315-328
Design of a CW 1 THz gyrotron at second harmonic operation using a 20 T superconducting magnet has been described. The mode
competition analysis is employed to investigate operation conditions of second harmonic mode, which is being excited at the
frequency ranging from 920 GHz to 1014 GHz. The output power up to 250 watt corresponding to the efficiency of 4.16 percent
could be achieved by using an electron beam with accelerating voltage 30 kV and current 200 mA. The important advantage of
this gyrotron is that the single mode excitation at second harmonic, and extremely high frequency of the radiation, could
be maintained even at high currents. It opens possibility to realize a high power radiation source at 1 THz. Such gyrotron
is under construction at FIR Center, University of Fukui. 相似文献
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三线圈超导磁体在脉冲电流下的动力稳定性分析 总被引:1,自引:1,他引:1
对于聚变反应堆中超导载流磁体在稳态电流基础上受到脉冲电流影响时的动力稳定性给出了定量分析方法。结合其超导载流磁体的实验结构,给出了超导磁体在不同稳态工作电流(即低于稳态的磁弹性人稳临界电流)作用下受到矩形脉冲电流作用 磁弹性动力响应的数值模拟结果。在此基础上,给出了关于稳态工作电流、脉冲电流强度和脉冲持续时间等参数的磁弹性动力稳定性参数范围。 相似文献
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八通式单光栅展宽器的特性研究 总被引:1,自引:0,他引:1
本文通过对八通式单光栅展宽器的分析,理论上计算了在啁啾脉冲放大过程中,初始入射的无啁啾超短脉冲相继两次通过展宽器时每次所能获得的展宽倍数,最终得出它第二次的展宽倍数仅约为2,总的展宽倍数是第一次展宽倍数的2倍. 相似文献
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由于磁能密度公式ωm=12BH只适用于线性介质,对永磁体不适用,本文利用磁荷观点计算了在真空中永磁体所激发磁场的静磁能密度 相似文献
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T. Rzesnicki J. Jin B. Piosczyk M. Thumm G. Michel D. Wagner 《International Journal of Infrared and Millimeter Waves》2006,27(1):1-11
The design of the quasi optical (q. o.) RF output system for the first industrial prototype of the European 170 GHz, 2 MW,
CW coaxial cavity gyrotron for electron cyclotron heating and current drive in ITER has been verified at a low power level.
Results of measurements with a high quality TE34,19-mode generator are in good agreement with the design calculations. This strengthens the confidence both to the employed design
codes and to the manufacturing quality of the launcher and mirrors. 相似文献
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本文将染料的振动弛豫速率引入超短光脉冲染料放大器的速率方程,建立了包括染料振动弛豫的超短光脉冲染料放大模型。并且将模型分析的结果与振动弛豫的模型进行了比较,新模型能更好的解释超短光脉冲染料介质中的放大结果。提出了一种测量染料振动弛豫寿命的可能的方法。 相似文献
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用数码照相法研究落球法测量液体的粘滞系数实验 总被引:1,自引:0,他引:1
本文用数码照相法研究落球法测量液体的粘滞系数实验,用截图软件对照片进行下落距离的测量.分析了数码相机作为时间测量仪器的使用,以及实验结果所能达到的测量精度. 相似文献
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利用自制微波增强微秒级脉冲辉光放电装置,研究了黄铜样品原子的激发和扩散过程。结果表明,当放电气压低于180Pa时,微波等离子体与辉光放电能够很好的耦合,当气压大于200Pa时,由于样品原子分别受到脉冲辉光放电与微波等离子体的激发,同一条共振线出现了在时间上独立的两个发射峰。利用两发射峰之间的关系可以计算出该工作条件下铜原子和锌原子的扩散速度分别约为150和129m/s,而辉光放电的最强激发点约离溅射样品表面1.94~2.25mm。实验中也考察了放电参数对两发射峰强度的影响 相似文献