论文标题
超级参数X射线发射
Superradiant parametric X-ray emission
论文作者
论文摘要
我们从一堆电子中计算了一系列参数X射线辐射（PXR）的频谱，该晶体在密度上定期调节。我们认为，一堆电子正在从XFEL通道退出。我们证明，在参数X射线辐射的频率与电子束调节频率之间存在共振的情况下，形成了强准单调X射线脉冲的序列 - 超级参数X射线发射（SPXE）具有调制频率的频率倍数。在极度不对称衍射的情况下，SPXE脉冲中的光子数量与Xfel脉冲中的光子数相当。此外，SPXE是在与电子速度的较大角度定向的，并且光谱中的每个谐波都以其自身的角度发射。
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.
