电子束在弯曲螺线管中的运动

The motion of electron beam in toroid

为研究 HIRFL-CSR电子冷却装置中电子束穿过电子冷却装置中弯曲螺线管后电子横向能量的变化 ,用 Poisson程序计算出弯曲螺线管的磁场分布 ,考虑了空间电荷效应 ,用数值方法模拟计算了电子在弯曲螺线管中的运动情况 ,得到了电子束横向能量变化最小时磁场各分量与电子束能量和弯曲螺线管几何尺寸之间的关系 。

The electron beam is deflected into and out interaction region by toroid in the electron cooling device for HIRFL CSR. The magnetic field distribution in toroid and interface among toroid and solenoids is very complicated. The properties of the magnetic field in toroid give rise to a change in the transverse energy of the electron. A program is developed to study the spatial transverse energy distribution of electron in the beam as it moves through the toroid. The space charge effect is taken into account in the calculation. The simulation results show that the increase of the transverse energy can be minimized when the ratio of the central length of toroid and the cyclotron wavelength of electron is integer.