【作者】 杜应超；

【导师】 林郁正； 唐传祥；

【作者基本信息】 清华大学 ， 核科学与技术， 2004， 硕士

【摘要】 基于汤姆逊散射的X射线源是在上世纪末随着加速器技术和激光技术的发展而提出的一种新型X射线源。它利用超短脉冲激光与高亮度的相对论电子束相互作用,在电子束前进方向产生方向性好、高亮度、短时间结构和能量可调的准单能X射线,在超快物理过程研究和医学物理研究中具有广泛的应用前景。清华大学加速器实验室正在积极筹建基于汤姆逊散射的X射线源实验平台,要对汤姆逊散射X射线源的理论和关键技术进行研究,并根据现有实验条件开展初步实验研究。据此,本论文的工作将围绕汤姆逊散射X射线源的理论研究和初步实验研究展开论文首先从单电子线性散射模型出发,对在任意作用角度下的X射线脉冲分布情况和脉冲光子产额与电子束参数和激光参数的关系进行了研究,并分析了非理想因素如作用点位置偏差、激光和电子束时间同步偏差等因素对X射线脉冲参数的影响。在此基础上对光源亮度与电子束和激光束参数的关系也进行了解析求解。本论文的另外一个主要内容是采用16 MeV返波行波加速器与纳秒调Q激光器进行汤姆逊散射X射线源的初步实验研究。我们根据加速器束流和激光器参数和特点,设计了177度角对撞的初步实验方案。根据实验要求,对加速器和激光器进行了改造,设计了实验用的束流传输系统、真空系统、束流测量系统、同步系统,并根据产生的X射线特点设计了X射线的探测方案。更多还原

【Abstract】 Thomson scattering based X-ray radiation source, in which a laser beam is scat-tered off a relativistic electron beam resulting in the generation of a high-energy X-raybeam, is a new kind of X-ray source that has been developed with the advancementsof the accelerator and laser technology since 1990’s. It can provide ultra-short pulseduration, high-peak brightness, tunable and monochromatic X-ray , and is useful ina number of fields including medical imaging, solid state physics, material science,chemical, biological and industrial applications. Tsinghua University Accelerator lab-oratory is planning to built a Thomson scattering X-ray source. Study on the Thomsonscattering X-ray source is being carried out. This dissertation inculdes theoretical re-search and preliminary experiment of the thomson scattering X-ray source.First, the relations of the beam parameters between the X-ray and electron andlaser at interaction point based on the linear Thomson scattering model are studied.The formulas for the pulse length and yield of X-ray photons at arbitrary interactionangles between electron and laser are deduced. The in?uences of some nonideal fac-tors, such as laser bandwidth, electron energy spread and emittance, interaction pointand synchronization errors on the X-ray parameters are studied.The second part of this dissertation is concentrated on the Thomson scatteringX-ray measurement by means of the 16MeV backward traveling wave electron linacand the Q-switched YAG nanosecond laser system. A 177 degree interaction anglesbetween the electron and laser is selected.Also the beam transport system, vacuumchamber, beam measurement system, synchronization system and detector system aredesigned and fabricated.更多还原