Plasma filamentation and shock wave enhancement in microwave rockets by combining low-frequency microwaves with external magnetic field
Plasma filamentation and shock wave enhancement in microwave rockets by combining low-frequency microwaves with external magnetic field
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DOI：
10.1063/1.4960805
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发表时间：
2016-08
影响因子：
3.2
通讯作者：
Masayuki Takahashi;N. Ohnishi
中科院分区：
文献类型：
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作者：
Masayuki Takahashi;N. Ohnishi
丝状等离子体是基于电子和离子传输与电磁波传播耦合的全动力学模型来再现的。由于电离前沿传播速度增加期间发生的快速电子扩散，放电等离子体在 110 GHz 击穿频率下从离散图案转变为扩散图案，同时环境压力降低。当低频微波照射时，在低压下获得离散等离子体，因为当电子被低频微波有效加热时，电离过程变得比电子扩散更占主导地位。等离子体的传播速度随着入射微波频率的降低而增加，因为能量吸收率的增加导致更高的电离频率和更快的等离子体扩散。将外部磁场施加到击穿体积，这会在较低压力下引起等离子体丝状化，因为电子扩散是...
A filamentary plasma is reproduced based on a fully kinetic model of electron and ion transports coupled with electromagnetic wave propagation. The discharge plasma transits from discrete to diffusive patterns at a 110-GHz breakdown, with decrease in the ambient pressure, because of the rapid electron diffusion that occurs during an increase in the propagation speed of the ionization front. A discrete plasma is obtained at low pressures when a low-frequency microwave is irradiated because the ionization process becomes more dominant than the electron diffusion, when the electrons are effectively heated by the low-frequency microwave. The propagation speed of the plasma increases with decrease in the incident microwave frequency because of the higher ionization frequency and faster plasma diffusion resulting from the increase in the energy-absorption rate. An external magnetic field is applied to the breakdown volume, which induces plasma filamentation at lower pressures because the electron diffusion is s...