關(guān)于軸向磁場的自由電子激光器增益特性
ON THE GAIN CHARACTERS OF FREE ELECTRON LASER WITH AN AXIAL MAGNETIC FIELD
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摘要: 本文從流體力學(xué)麥克斯韋方程組出發(fā),用拉氏變換方法求得了考慮軸向磁場的自由電子激光器的增益公式。數(shù)值計算和色散關(guān)系的分析表明,當(dāng)迴旋頻率接近于入射波頻率i與電子等離子體頻率p之差#em/em#p時,增益會大大下降,并且增益與泵浦-信號失配關(guān)系曲線的峰值的位置也會由原來的p向低的方向移動,我們可以利用i-p時出現(xiàn)增益零點的現(xiàn)象來推算p。
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關(guān)鍵詞:
Abstract: Starting from fluid mechanics-Maxwell coupled equations, a gain formula of free electron laser with an axial magnetic field is obtained by use of Laplace transform. The numerieal calculations and the analyses of the dispersion relation indicate that when the electron cyclotron frequency approaches to i-p(i is the frequency of the incident pump wave and p is the electron plasma frequeney), there is a marked drop in the gain and the position of the peak of gain-pump signal mismatch curve shifts downwards from p. We can use the phenomenon of zero-gain to calculate p. -
T. C. Marshall, S. P. Schlesinger and D. M. McDermott, Advances in Electronics and Electron Physics, Academic Press, INC Vol. 53(1980), p. 47.[2]D. B. McDermott and T. C. Marshall, Physics of Quantum Electronics, 7(1980), 509.[3]P. K. Parker et al., Phys. Rev. Lett., 48(1982), 238.[4]P. Sprangle and V. L. Granatstein, Appl. Phys. Lett., 25(1974), 377.[5]尹元昭,電子學(xué)通訊,4(1982), 312.[8]R. H. Jackson et al., IEEE J. Quantum Electron, QE-19(1983), 346.[9]W. B. Colson, Physics of Quantum Electronics, 5(1978), 157.[10]A. N. Didenko et al., IEEE Trans. on NS, NS-28(1981),3169. -
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