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arXiv 0908.4503physics.acc-phhep-ph
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弯曲晶体中的相干韧致辐射

Coherent bremsstrahlung in a bent crystal

M. V. Bondarenco

摘要:

基于稳相近似,计算了高能$e^\pm$在沿纵坐标任意曲率分布的弯曲晶体中的辐射谱。对于均匀弯曲的晶体的光谱的封闭形式的表达式。讨论了光谱的尖锐末端和光谱起始处的体反射翻转等特征。在弯曲晶体的相干长度似乎只取决于晶体的几何形状,而不是对电子或光子的能量,这是必不可少的解释的结果。非偶极子辐射和多次散射效应的估计。偶极相干韧致辐射理论最适用的晶体弯曲角的值似乎是$\sim 10^{-4}\mathrm{rad}$。

英文摘要:

Radiation spectrum from high energy $e^\pm$ in a bent crystal with arbitrary curvature distribution along the longitudinal coordinate is evaluated, based on the stationary phase approximation. For a uniformly bent crystal a closed-form expression for the spectrum is derived. Features such as sharp end of spectrum and volume reflection turnover at beginning of the spectrum are discussed. The coherence length in a bent crystal appears to depend only on the crystal geometry and not on the electron or photon energies, which is essential for interpretation of the results. Estimates of non-dipole radiation and multiple scattering effects are given. The value for the crystal bending angle at which the dipole coherent bremsstrahlung theory holds best appears to be $\sim 10^{-4}\mathrm{rad}$.

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