寻找新光源,特别是企图利用PXR作为激光光源引起了人们广泛关注.要成功获得相干(衍射)的PXR光源,粒子的运动必须是稳定的.但是由于晶体弯曲,系统可能变得不稳定,从而对PXR的反射、衍射、聚焦和谱分布均会产生直接影响.在经典力学框架内和偶极近似下,引入正弦平方势,把粒子在弯晶中的运动方程化为具有常数力矩的摆方程.利用Jacobian椭圆函数和椭圆积分分析了系统的相平面特征.结果表明,系统的稳定性与弯晶"曲率"Q有关,当条件O≤Q<1满足时,系统是稳定的.
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