X射线在狭窄粗糙毛细管中的波沟道--非Andronov-Leontovich理论
Wave channeling of X-rays in narrow rough capillaries - non Andronov-Leontovich theory
摘要：
考虑到过渡边界层中粗糙散射引起的衍射和相干性衰减，研究了X射线束在窄亚微米毛细管中的捕获效应。与著名的Andronov-Leontovich方法相反，损失在零滑动角下不消失，并且对于小滑动角，与粗糙度幅度的一次幂成比例。结果表明，对于小的粗糙度关联半径，相干性散射衰减可以与低沟道模吸收衰减同阶，从而产生X射线束的角准直。给出了在不同粗糙度幅值下，X射线透射角灵敏度和反射效应的最佳毛细管长度的估计值，可用于探测器系统的设计。
英文摘要：
The effect of capture of X-ray beam into narrow submicron capillary was investigated with account for diffraction and decay of coherency by roughness scattering in transitional boundary layer. In contrast to well-known Andronov-Leontovich approach the losses do not vanish at zero gliding angle and scale proportional to the first power of roughness amplitude for small gliding angles. It was shown that for small correlation radius of roughness the scattering decay of coherency can be made of the same order as absorption decay of lower channeling modes to produce angular collimation of X-ray beams. Estimates were given for optimum capillary length at different roughness amplitudes for angular sensitivity of X-ray transmission and chenneling effects that can be usefull for designing of detector systems.
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