超辐射参量X射线发射
Superradiant parametric X-ray emission
摘要：
我们计算了晶体内部的参量X射线辐射（PXR）谱，该谱来自密度周期性调制的电子束。我们认为电子束是从XFEL沟道出射的。我们证明，在参数X射线辐射的频率和电子束团的调制频率之间的共振的情况下，形成强的准单色X射线脉冲序列-超辐射参数X射线发射（SPXE）的调制频率的倍数的频率。在极不对称衍射的情况下，SPXE脉冲中的光子数与XFEL脉冲中的光子数相当。此外，SPXE被引导在与电子速度的大角度下，并且光谱中的每个谐波都在其自己的角度下发射。
英文摘要：
We compute a spectrum of parametric X-ray radiation (PXR) inside a crystal from a bunch of electrons, which is periodically modulated in density. We consider that the bunch of electrons is exiting from a XFEL channel. We demonstrate that in the case of a resonance between the frequency of parametric X-ray radiation and a frequency of modulation of an electron bunch the sequence of strong quasi-monochromatic X-ray pulses is formed -- superradiant parametric X-ray emission (SPXE) with frequencies multiples of the modulation frequency. The number of photons in the impulse of SPXE in the case of an extremely asymmetric diffraction is comparable with the photon number in the impulse of a XFEL. Moreover the SPXE is directed under the large angle to the electron velocity and every harmonic in the spectrum is emitted under its own angle.
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