逆康普顿散射中红移和谐波辐射的观测

Y. Sakai, I. Pogorelsky, O. Williams, F. O’Shea, S. Barber, I. Gadjev, J. Duris, P. Musumeci, M. Fedurin, A. Korostyshevsky, B. Malone, C. Swinson, G. Stenby, K. Kusche, M. Babzien, M. Montemagno, P. Jacob, Z. Zhong, M. Polyanskiy, V. Yakimenko, J. Rosenzweig
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引用次数: 36

摘要

超相对论性电子束对激光光子的逆康普顿散射,由于多普勒蓝移,提供了偏振x射线到$\ensuremath{\gamma}$射线脉冲。在相对强的线偏振激光场中,非线性电动力学改变了康普顿相互作用中建立的辐射动力学。这是由于诱发的数字8运动,它在辐射光谱中引入了一个整体红移,伴随着高次谐波的发射。为了实验分析与非线性电子-激光相互作用相关的强场物理,观察到x射线的角度和波长分布的明显变化。相对论光子波场是由峰值归一化矢量势为$0.5l{a}_{L}l0.7$的ps ${\mathrm{CO}}_{2}$激光器提供的,由于非线性现象强度与${a}_{L}$的二次依赖关系,使得${a}_{L}\ensuremath{\approx}0.3$激光器在过去的二次谐波研究中没有观察到足够的效应[,物理学]。Rev. Lett. 96, 054802(2006)]。利用$K$ -, $L$边缘和高能量衰减滤波器揭示了角光谱特性。观测结果表明,电子通过频率红移进行纵向运动,即质量位移效应。因此,已经观察到三次谐波辐射包含与诱导的8字形运动直接相关的轴上x射线分量。在圆偏振激光波场中产生的离轴二次谐波辐射的初步证据进一步支持了这些。经0.3 nC的65 MeV电子束散射,在相互作用点处的每脉冲x射线总光子数约为${10}^{9}$。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Observation of redshifting and harmonic radiation in inverse Compton scattering
Inverse Compton scattering of laser photons by ultrarelativistic electron beam provides polarized x- to $\ensuremath{\gamma}$-ray pulses due to the Doppler blueshifting. Nonlinear electrodynamics in the relativistically intense linearly polarized laser field changes the radiation kinetics established during the Compton interaction. These are due to the induced figure-8 motion, which introduces an overall redshift in the radiation spectrum, with the concomitant emission of higher order harmonics. To experimentally analyze the strong field physics associated with the nonlinear electron-laser interaction, clear modifications to the angular and wavelength distributions of x rays are observed. The relativistic photon wave field is provided by the ps ${\mathrm{CO}}_{2}$ laser of peak normalized vector potential of $0.5l{a}_{L}l0.7$, which due to the quadratic dependence of the strength of nonlinear phenomena on ${a}_{L}$ permits sufficient effects not observed in past 2nd harmonic study with ${a}_{L}\ensuremath{\approx}0.3$ laser [, Phys. Rev. Lett. 96, 054802 (2006)]. The angular spectral characteristics are revealed using $K$-, $L$-edge, and high energy attenuation filters. The observation indicates existence of the electrons' longitudinal motion through frequency redshifting understood as the mass shift effect. Thus, the 3rd harmonic radiation has been observed containing on-axis x-ray component that is directly associated with the induced figure-8 motion. These are further supported by an initial evidence of off-axis 2nd harmonic radiation produced in a circularly polarized laser wave field. Total x-ray photon number per pulse, scattered by 65 MeV electron beam of 0.3 nC, at the interaction point is measured to be approximately ${10}^{9}$.
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来源期刊
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期刊介绍: Physical Review Special Topics - Accelerators and Beams (PRST-AB), is a peer reviewed, purely electronic journal, distributed without charge to readers and funded by contributions from national laboratories. It covers the full range of accelerator science and technology: subsystem and component technologies, beam dynamics; accelerator applications; and design, operation, and improvement of accelerators used in science and industry. This includes accelerators for high-energy and nuclear physics, synchrotron radiation production, spallation neutron sources, medical therapy, and intense beam applications.
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