排序方式: 共有11条查询结果,搜索用时 15 毫秒
1.
M. V. Kartikeyan G. Singh E. Borie B. Piosczyk M. Thumm 《International Journal of Infrared and Millimeter Waves》2006,27(5):657-670
The feasibility of an 84 GHz, 500 kW, CW gyrotron for ECRH on an experimental tokamak will be presented in this paper. Mode
competition and mode selection procedures are carefully investigated by considering various candidate modes and the TE10,4 mode is chosen as the operating mode. A conventional cylindrical cavity resonator with weak input and output tapers and parabolic
roundings is considered for interaction studies. Self-consistent, both single mode and time-dependent, calculations are carried
out and power and efficiencies are computed for a typical set of beam parameters. The results show that an output power of
well over 500 kW, CW and efficiency around 40% can be reached without a depressed collector. 相似文献
2.
Calculated trajectories for the electron beam of a known gyrotron have been analysed to determine the relative importance of some of the contributions to velocity spread. For the geometry analysed, space-charge and thermal velocities at the cathode produced only a small part of the calculated velocity spread; much more was generated by the variation of electric field over the length of the cathode surface. The total range of transverse velocity was substantially reduced by adjustment of the shape of one electrode. 相似文献
3.
Edith Borie 《International Journal of Infrared and Millimeter Waves》2008,29(2):113-130
The influence of some cavity parameters on the resonance frequency and quality factor is investigated with the aim of comparing
various methods of optimization. As an example, the geometry of the designed resonator for an experiment on a multifrequency
gyrotron that would operate at 140 GHz in the TE22,8 mode is considered. This is a weakly–tapered conventional cavity resonator with parabolic–roundings. The influence of the
roundings on the quality factor is at least as important as that of the cavity length and the output taper angle. 相似文献
4.
介绍了用铌酸锂(LiNbO3)高速光强度调制器测量HL-2A装置ECRH系统高压隔离电参数的新方法,测量结果表明:隔离100kV高压的响应时间小于0.1μs,线性误差小于1%,并对器件存在的问题和实际应用的可行性进行了分析。 相似文献
5.
O. Dumbrajs H. Kalis A. Reinfelds 《International Journal of Infrared and Millimeter Waves》2005,26(6):787-805
Limits on the power generated by coaxial gyrotrons are investigated. It is shown that among all the operating modes suggested recently for coaxial super power gyrotrons only modes with azimuthal index m lower than about 44 pass the spatial stochasticity test. Modes with higher azimuthal indices cannot be used as operating modes because gyrotron oscillations become chaotic in the azimuthal direction and efficiency is very low. It is argued that there exists a natural upper limit on power generated by gyrotrons which is about 4 MW. 相似文献
6.
M. E. Read K. R. Chu K. J. Kim 《International Journal of Infrared and Millimeter Waves》1981,2(2):159-174
Upper and lower limits to the output power of highly efficient gyrotron oscillators operating with TEon1 modes, due to lower and upper limits on the cavity Q, are given. 相似文献
7.
G. Singh M. V. Kartikeyan A. K. Sinha B. N. Basu 《International Journal of Infrared and Millimeter Waves》2002,23(4):517-533
In this paper, the dispersion relation for a vane-loaded cylindrical waveguide, considering the azimuthal harmonic effects arising from the azimuthal periodicity of the vanes, excited in transverse electric (TE) modes and the gain for a gyro-TWT have been presented. The effects of beam and magnetic field parameters on two highly competing modes have been studied. 相似文献
8.
Zisis C. Ioannidis Olgierd Dumbrajs Ioannis G. Tigelis 《International Journal of Infrared and Millimeter Waves》2008,29(4):416-423
We consider two continuous frequency tunable CW coaxial gyrotron oscillators, one 330 GHz with 3 GHz bandwidth and output
power 50 – 400 W for scientific applications and one 30 GHz with 0.4 GHz bandwidth and output power 40 – 140 kW for industrial
applications. The continuous tuning of both gyrotrons is achieved by moving the linearly tapered inner conductor in the axial
direction in combination with the proper adjustment of the operating magnetic field. We consider also a non-linear tapering,
which makes it possible to reduce the length of the insert and to improve efficiency of the device. 相似文献
9.
Nonstationary behavior of a gyrotron in the presence of reflections is investigated by means of our time-dependent self-consistent code. It is shown that the traditionally accepted scenario of the transition from the single-frequency stationary operation regime to the chaotic nonstationary regime due to an increase in the magnitude of the reflection coefficient is not correct if a realistic non-fixed field profile is used in the simulations. In this case, the increase of the reflection coefficient above a certain threshold value (R 0.4) leads to an excitation of a number of modes of the mismatched gyrotron cavity. Then the gyrotron shows a very complicated periodic or quasiperiodic behavior. For higher reflection coefficients (R 0.85), the competition between the modes of the mismatched cavity leads to the suppression of the main mode by another one operating at higher frequency. The influence of the distance to the reflecting load on the gyrotron behavior is also demonstrated. 相似文献
10.
Oleksiy S. Kononenko Yuriy V. Gandel 《International Journal of Infrared and Millimeter Waves》2007,28(4):267-274
For the first time rigorous theory is developed for eigen traveling TM modes in the resonator of the coaxial cavity gyrotron
with a corrugated insert. This mathematical model can be applied for any corrugation parameters and wavelengths. Gyrotron
simulation software is developed and allows to calculate mode eigenvalues, electromagnetic field components and Ohmic losses
for eigen TE and TM modes. Results of the numerical investigations are presented for the ITER relevant 170 GHz coaxial cavity
gyrotron developed in Forschungszentrum Karlsruhe, Germany. 相似文献