非线性汤姆逊散射产生的超高亮度multi-MeV $γ$光束
Ultra-high brilliance multi-MeV $γ$-ray beam from non-linear Thomson scattering
摘要：
本文报道了由超相对论激光尾流场加速电子束在相对论强激光场中的散射产生窄发散（$θ\approx 2.5$ mrad）、多MeV（$E_\text{MAX} = 18$ MeV）和超高亮度（$\approx 2\times10^{19}$ photons s $^{-1}$ mm $^{-2}$ mrad $^{-2}$ 0.1 BW）的$γ$ -射线束（无量纲振幅$a_0\approx2$）。测量产生的$γ$射线束的光谱，具有MeV分辨率，从6 MeV到18 MeV无缝，给出了非线性汤姆逊散射开始的明确证据。光子源具有最高的亮度，在多MeV制度的文献报道。
英文摘要：
We report on the generation of a narrow divergence ($θ\approx 2.5$ mrad), multi-MeV ($E_\text{MAX} = 18$ MeV) and ultra-high brilliance ($\approx 2\times10^{19}$ photons s$^{-1}$ mm$^{-2}$ mrad $^{-2}$ 0.1\% BW) $γ$-ray beam from the scattering of an ultra-relativistic laser-wakefield accelerated electron beam in the field of a relativistically intense laser (dimensionless amplitude $a_0\approx2$). The spectrum of the generated $γ$-ray beam is measured, with MeV resolution, seamlessly from 6 MeV to 18 MeV, giving clear evidence of the onset of non-linear Thomson scattering. The photon source has the highest brilliance in the multi-MeV regime ever reported in the literature.
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