论文标题
磁化等离子体的X模式构型中激光能量的局部吸收
Localized absorption of laser energy in X-mode configuration of magnetized plasma
论文作者
论文摘要
在几个天体物理和实验室等离子体中，已经观察到通过较低的杂化波加热离子的加热。我们已经进行了粒子中的粒子模拟，以通过操纵血浆密度曲线来证明在目标中选定的局部局部位置吸收入射激光脉冲。我们表明，当入口激光器的一部分在等离子体靶标内传播，当它的频率位于较低的混合谐振频率以下时。此后，由于它经历了负密度梯度，因此它接近共振点，其组速度接近零。这是电磁能显着转化为静电的地方，并最终转化为离子的动能。因此，通过调整等离子体密度曲线，可以在血浆内指定的位置吸收入射电磁波能。这在各种应用中可能具有重要意义，在各种应用中，需要在局部区域的等离子体的能量沉积/加热。
The heating of ions via lower hybrid waves has been observed in several astrophysical as well as laboratory plasmas. We have conducted Particle-In-Cell simulations to demonstrate absorption of the incident laser pulse at a chosen localized point in the target by manipulating the plasma density profile. We show that a part of the incident laser propagates inside plasma target, when its frequency lies below the lower hybrid resonance frequency. Thereafter, as it experiences a negative density gradient, it approaches the resonance point where its group velocity approaches zero. This is where the electromagnetic energy prominently gets converted into electrostatic and eventually into kinetic energy of ions. Thus by tailoring the plasma density profile one can have the absorption of incident electromagnetic wave energy at a designated location inside the plasma. This may have importance in various applications where energy deposition/heating of plasma at a localized region is desirable.
