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1带电粒子做定向运动例1图1所示为一直线加速器的示意图,在高真空长隧道中,有n个长度逐渐加大的共轴金属圆筒,各圆筒相互间隔地接在频率为f,电压峰值为U的交变电源两极间,筒间间隙极小,粒子从离子源发出后经过第一次加速,以速度v1进入第一个圆筒,此时第二个圆筒的电势比第一个
1 Charged particles do directional motion Example 1 Figure 1 shows a schematic diagram of a linear accelerator. In a long tunnel with high vacuum, there are n coaxial metal cylinders of increasing length, each cylinder being connected at a frequency of f, between the two poles of the alternating-current power source with U peak voltage, the gap between the cylinders is extremely small. After the particles are emitted from the ion source, they accelerate for the first time and enter the first cylinder at the speed v1. At this time, the potential of the second cylinder is Than the first