自由電子激光輻射和迴旋輻射的比較研究
COMPARISON BETWEEN FEL AND CYCLOTRON RADIATIONS
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摘要: 在自由電子激光器中一般存在兩種受激輻射形式:自由電子激光輻射和迴旋輻射。本文從理論上闡明,如果電子束的初始橫向速度較大,自由電子激光器的參數(shù)選用不當(dāng),則迴旋輻射將占優(yōu)勢(shì),特別當(dāng)電子束能量較低時(shí),產(chǎn)生迴旋輻射的傾向更大。但是迴旋輻射并不具有雙重多普勒頻率上漂移的特性,由于受軸向磁場(chǎng)強(qiáng)度的限制,在電子束能量較高時(shí),其輻射頻率要比自由電子激光輻射頻率低得多。因此在自由電子激光器的實(shí)驗(yàn)研究中,如何區(qū)別這兩種輻射,并有效地抑制迴旋輻射,是一個(gè)十分重要的課題。
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關(guān)鍵詞:
- 自由電子激光器; 受激輻射; 自由電子激光輻射; 迴旋輻射
Abstract: In general, in free electron lasers there two kinds of stimulated radiations. FEL radition and cyclotron ralition. It is shown theoretically, if the initial transverse velocity of electron is large and the selected parameters for FEL are not suitable, the cyclotron radiation will be dorninant, especially when the energy of electron beam is low. But the cyclotron radiation does not have double Doppler frequency up-shift effect, is frequency is limited by axial magnetic field, when the energy of electron beam is low. But the cyclotron radiation does not have double Doppler frequency up-shift effect, is frequency is limited by axial magnetic field, when the energy of electron beam is high, the cyclotron radiation frequency will be much lower than FEL radiation frequency. Therefore, in FEL experiments how to distinguish these two kinds of radiations and to suppress the cyclotron radiation are very important. -
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