内束 meaning in English

internal beam

For example , one of us ( umstadter ) has demonstrated electron beams of a few million electron - volts whose “ brightness ” ( in essence , the concentration of particles in the beam ) exceeds that of beams made by conventional accelerators , mainly because the charges bunched in one pulse of the beam have less time to blow it apart by its own electrostatic forces
例如乌姆斯塔特（本文作者之一）便曾展示过，具有数百万电子伏特的电子线束之亮度（基本上，即是线束内的粒子浓度）超过了传统加速器产生的线束，因为脉冲内束在一起的电荷根本没时间以自身的静电把别人挤开。