加速器光源是短波长高平均功率光的重要实现途径。自由电子激光可实现高峰值功率，同步辐射具有高重复频率。稳态微聚束(SSMB)则将自由电子激光和同步辐射的特点相结合，是高平均功率光源的新方案。本论文围绕SSMB，对储存环在双激光调制器作用下的SSMB纵向动力学进行了深入研究，开展了SSMB纵向强聚焦储存环设计，可将微束团长度压缩至纳米量级，并产生高平均功率极紫外辐射。储存环纵向动力学是SSMB纵向强聚焦研究的重点，也是环物理研究的新前沿。论文将纵向和横向Twiss函数组合成一个完整的三维Twiss体系，给出了平面型储存环单圈传输矩阵、稳态横纵向发射度在该体系下的解析表达形式。激光调制器和储存环稳态纵向发射度优化是实现SSMB的关键。论文建立了激光调制器的物理模型，对激光调制器的能量调制过程进行了理论分析，给出其纵向传输矩阵与激光和波荡器参数之间的解析关系，并针对激光调制器等效调制电压开展了优化。同时，论文解析推导了二极铁、波荡器和激光调制器等典型二极场元件对稳态纵向发射度的贡献，提出一套基于本征纵向Twiss函数的储存环稳态纵向发射度优化方法。论文深入研究了双激光调制器强聚焦模式下的储存环纵向动力学，讨论了稳定性条件、纵向动力学孔径等问题，解析给出了微束团的稳态发射度以及在环内和强聚焦段内的束长、能散。同时也对微束团在波荡器中的辐射进行了理论分析，推导出具有任意六维相空间分布的束团在波荡器内的相干辐射能谱和功率。论文自主开发了一个SSMB纵向强聚焦优化程序，基于此完成了清华SSMB-EUV光源纵向强聚焦储存环的初步设计和优化。结果表明，强聚焦段内的稳态束长可短至2.1纳米，在13.5纳米的极紫外辐射功率约3200瓦。
Accelerator light source is an important method to achieve short-wavelength high-average-power light. Free-electron lasers are able to provide high peak power, and synchrotron radiation has high repetition rate. Steady-state microbunching (SSMB) combines the properties of both free-electron laser and synchrotron radiation, and is a novel scheme of high-average-power light source. Focusing on SSMB, this dissertation studies the longitudinal dynamics of SSMB storage ring under the action of dual laser modulators deeply, and carries on the design of SSMB longitudinal strong focusing storage ring. Results show that the microbunches can be compressed to a length of nanometer level, and high-average-power extreme ultraviolet (EUV) radiation can also be produced. The storage ring longitudinal dynamics is essential to longitudinal strong focusing studies, and it is also a new frontier in the researches of storage ring physics. We combine the longitudinal and transverse Twiss functions to form a complete three-dimensional Twiss system, and deduce the analytical expressions for one-turn map, equilibrium transverse and longitudinal emittance of a planar lattice. Laser modulators and the equilibrium longitudinal emittance optimization are the keys of realizing SSMB. The physical model of laser modulator is constructed, a detailed theoretical analysis on its energy modulation is done, the analytical relationship between its longitudinal transfer matrix and the laser/undulator parameters is given, and optimization on its equivalent modulation voltage is also carried out. Meanwhile, we derive the longitudinal emittance contribution of dipole, undulator and laser modulator through the analysis of the equilibrium emittance theory of storage ring. For the first time, we propose an equilibrium longitudinal emittance optimization method which is based on intrinsic Twiss function. This dissertation studies the storage ring longitudinal dynamics in dual laser modulators strong focusing mode carefully, discusses the stability conditions, the longitudinal dynamic aperture, etc., and analytically presents the equilibrium microbunch emittance, length and energy spread both in the ring and in the strong focusing section. The coherent undulator radiation of such short electron bunch is analyzed theoretically and intensively. For the first time, we give the expressions of coherent undulator radiation spectrum and power for electron beam with arbitrary 6D phase space distribution. We also develop a longitudinal-strong-focusing analysis and optimization code, based on which we complete the preliminary lattice design and optimization of the longitudinal strong focusing storage ring of THU SSMB-EUV light source. As a result, the length of steady-state microbunches in the strong focusing section can be as short as 2.1 nanometers, and the EUV radiation power produced at a wavelength of 13.5 nanometers reaches about 3200 watt.
