二維擺動磁場自由電子激光自發(fā)輻射的頻譜特性
ANGULAR SPECTRUM PROPERTY OF SPONTANEOUS EMISSION IN A TWO-DIMENSIONAL UNDULATOR FREE-ELECTRON LASER
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摘要: 本文對二維擺動磁場自由電子激光的自發(fā)輻射頻譜進行了理論分析,并對分析結(jié)果進行了數(shù)值計算.計算結(jié)果表明,采用l(lkx=ky)值不同的二維擺動磁場,可以增強第l次諧波的自發(fā)輻射強度,從而能夠有選擇地實現(xiàn)自由電子激光的高次諧波運轉(zhuǎn).
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關(guān)鍵詞:
- 自由電子激光; 二維擺動磁場; 頻譜特性; 高次諧波
Abstract: The angular spectrum of spontaneous emission in a wo-dimensional undulator free-electron laser is analyzed theoretically. Numerical calcularion shows that the s-th harmonic spontaneous emission power density can be greatly enhanced by using a two-dimensional undulator, for which l=s. so the harmonic number can be selected by selecting l. Therefore, the higher harmonic operation of a free-electon laser can be realized selectively. -
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