【摘要】 <正> 采用直线加速器中的有限圆柱空间电荷模型,并假设该有限圆柱体电荷密度分布在纵向z和横向γ都满足高斯分布,推导得到了该电荷束团的自场能与发射度增长公式;通过数值模拟计算,给出了束流发射度增长随束团参数和加速器系统参数变化的图表曲线,讨论了更多还原

【Abstract】 Recent theoretical work and experimental studies on transport of intense beams in linac channels have identified nonuniform charge density distribution as a major cause of the beam emittance growth. A bunched beam with radius b and length L is studied, and its volume charge density distribution function as Gaussian type in both longitudinal and transverse directions. Using the general formulae for calculating the potential induced by space charge with nonuniform distribution, the formulae of self-energy and emittance growth for bunched beam with Gaussian type density distribution in both longitudinal and transverse directions in linac have been gotten. And the scaling law relating the beam parameters with the machine parameters is discussed by means of the numerical simulation results.更多还原