An interesting phenomenon called ‘ion transfer’, which may obviously affect the energy gain of cross-beams via changing the momentum and density of plasmas, is demonstrated. The increment of plasma momentum induced by it will be proportional to the transferred energy of the cross-beam according to the momentum conservation law. In addition, the ‘ion transfer’-induced variation of plasma density can be attributed to the balance of the ponderomotive force of the cross-beam and the plasma electron thermal pressure, which is proportional to the total intensity of the cross-beam, while inversely proportional to the plasma electron temperature. These results may make up for the deficiency of the existing linear coupled-mode-equations when investigating the cross-beam energy transfer under the action of ultra-intense laser.

演示了一个有趣的现象，称为“离子转移”，它可能会通过改变等离子体的动量和密度来明显影响横梁的能量增益。根据动量守恒定律，由它引起的等离子体动量的增量将与横梁的传递能量成比例。此外，“离子转移”引起的等离子体密度变化可归因于横束的动能平衡与等离子体电子热压力的平衡，该平衡与横束的总强度成正比，而与等离子体电子温度成反比。这些结果可以弥补在研究超强激光作用下的横光束能量传递时现有的线性耦合模方程的不足。