Terahertz source based on relativistic electron beams
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摘要: 太赫兹辐射在基础科学和产业应用中具有重要的应用前景，但传统的电子学和光学方法难以在1～10 THz产生相干的高功率、窄带且连续可调的太赫兹辐射。基于相对论性超短电子束和预调制电子束序列的加速器太赫兹源将能在上述范围内产生可调的高能谱强度窄带太赫兹辐射。综述了清华大学加速器实验室近年来在基于相对论电子束的加速器太赫兹源方面的理论和实验进展，以及与加速器太赫兹源一起发展起来的太赫兹辐射测量、束流诊断和先进加速技术。Abstract: Terahertz radiation has important prospects in fundamental science and industrial applications, but traditional electronic and optical methods can hardly generate high-power, narrow-band and continuously tunable coherent terahertz radiation at 1−10 THz. Accelerator-based terahertz sources using relativistic ultrashort electron beams or pre-modulated electron bunch trains have the possibility to generate tunable high spectral energy density narrow-band terahertz radiation in the above-mentioned range. This article reviews the recent theoretical and experimental progresses of the Tsinghua University Accelerator Laboratory in accelerator terahertz sources based on relativistic electron beams, as well as the terahertz radiation measurement, beam diagnosis and advanced acceleration technologies developed together with the accelerator terahertz sources.
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图 1 高斯分布超短电子束的形状因子
Figure 1. Form factor of ultrashort electron beams with Gaussian distribution
图 2 单束团50 fs的电子束序列形状因子
Figure 2. Form factor of electron micro-bunch trains with 50 fs micro-bunch length
表 1 太赫兹电子束序列的实验结果对比
Table 1. Comparison of experimental results of THz electron micro-bunch trains
published article affiliation bunch charge/pC tuning range/THz bunching factor PRL 101, 054801 (2008) BNL ～50 0.70～1.40 PRL 105, 234801 (2010) FERMI ～15 0.37～0.86 PRL 106, 184801 (2011) UCLA ～22 1.00 ～0.20 PRL 107, 204801 (2011) BNL ～100 0.26～2.60 PRL 109, 074801 (2012) SLAC ～40 12.00～17.00 ～0.02 PRL 108, 144801 (2012)
PRL 111, 134802 (2013)ANL ～100 0.68～0.90 PRL122, 044801 (2019) DESY ～1100 0.19～0.30 ～0.20 PRL 116, 184801 (2016) THU ～700 0.60～1.60 ～0.20 
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