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【单选题】
加速器是加速带电粒子的装置,其核心部分是分别与高频交流电源两极相连接的两个 D 形金属盒,两盒间的狭缝中形成周期性变化的电场,使粒子在通过狭缝时都能得到加速,两 D 形金属盒处于垂直于盒底的匀强磁场中,如图所示。设 D 形盒半径为 R 。若用回旋加速器加速质子时,匀强磁场的磁感应强度为 B ,高频交流电频率为 f 。则下列说法正确的是 A .质子被加速后的最大速度可能超过 2 πfR B .质子被加速后的最大速度与加速电场的电压大小无关 C .只要 R 足够大,质子的速度可以被加速到任意值 D .不改变 B 和 f ,该回旋加速器也能用于加速 α 粒子
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