CAJ | 학술논문

THz 波的产生有多种途径,清华大学加速器实验室正致力于发展基于相对论电子束的高峰值功率的 THz 辐射源.本文分别从高峰值流强的单束团与基于激光整形的多脉冲束团序列出发,介绍实验室在宽谱高电场梯度和准单频可调谐 THz 辐射等方面的研究进展.高亮度电子束团由新一代光阴极电子枪产生,经3 m行波加速管加速,能量可达~50 MeV,采用速度压缩机制可使束团长度达到百飞秒量级.该超短相对论束团可通过多种机制产生高峰值功率的 THz 辐射,目前,实验室已通过相干渡越辐射(CTR)获得单脉冲能量18μJ 的 THz 辐射输出.同时,提出了一种结合欠压缩工作模式和漂移压缩方法的新束团压缩方案,可进一步将束团压缩至几十飞秒,有望获得频率范围为0.1 THz~30 THz 的超宽谱 THz 辐射.本文同时介绍了多脉冲超短电子束序列的束团测量实验结果,通过模拟研究验证了基于该束团序列 CTR产生高功率、可调谐准单频 THz辐射的可行性,并进行了相应的实验方案设计.
THz 파적산생유다충도경,청화대학가속기실험실정치력우발전기우상대론전자속적고봉치공솔적 THz 복사원.본문분별종고봉치류강적단속단여기우격광정형적다맥충속단서렬출발,개소실험실재관보고전장제도화준단빈가조해 THz 복사등방면적연구진전.고량도전자속단유신일대광음겁전자창산생,경3 m행파가속관가속,능량가체~50 MeV,채용속도압축궤제가사속단장도체도백비초량급.해초단상대론속단가통과다충궤제산생고봉치공솔적 THz 복사,목전,실험실이통과상간도월복사(CTR)획득단맥충능량18μJ 적 THz 복사수출.동시,제출료일충결합흠압축공작모식화표이압축방법적신속단압축방안,가진일보장속단압축지궤십비초,유망획득빈솔범위위0.1 THz~30 THz 적초관보 THz 복사.본문동시개소료다맥충초단전자속서렬적속단측량실험결과,통과모의연구험증료기우해속단서렬 CTR산생고공솔、가조해준단빈 THz복사적가행성,병진행료상응적실험방안설계.
THz radiation can be generated in many ways. Tsinghua University Accelerator Laboratory is committed to the development of high peak power THz radiation sources based on the relativistic electron bunches. This paper introduces the broadband THz radiation with high-gradient electric field based on single electron bunch of high peak current, and the tunable single-frequency THz radiation based on bunch train. The electron bunches are generated from the photocathode RF gun, and are accelerated to~50 MeV after a 3 m SLAC type TW accelerating tube. Bunches are compressed to sub-picosecond by velocity bunching scheme and then used to generate intense THz pulses through Coherent Transition Radiation (CTR). Recently, experimental results have shown that the energy of CTR THz is up to 18 μJ per pulse. Besides, a new velocity bunching scheme is proposed by combining under-compression mode and drift compression, which is a promising way to further compress the electron bunch to tens of femtoseconds and to obtain ultra-broadband THz radiation ranging from 0.1 THz to 30 THz. The experimental results of electron bunch train are also introduced. Simulation results have verified the feasibility of generating tunable narrow-band THz radiation with short bunch train, and the related experiments are designed.