To study the heating mechanism of electron cyclotron resonance thruster (ECRT) immersed in a non-uniform magnetic field, experiments and simulations are performed based on an electron cyclotron resonance plasma source at ASIPP. It is found that the first harmonic of electron cyclotron resonance is essential for plasma ignition at high magnetic field (0.0875 T), while the plasma can sustain without the first and second harmonics of electron cyclotron resonance at low magnetic field (till 0.0170 T). Evidence of radial hollow density profile indicates that upper hybrid resonance, which has strong edge heating effect, is the heating mechanism of low-field ECRT. The heating mode transition from electron cyclotron resonance to upper hybrid resonance is also revealed. Interestingly, the evolutions of electron temperature and electron density with input power experience a ‘delayed’ jump, which may be correlated with the different power levels required for cyclotron and ionization. Moreo...

中文翻译：

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电子回旋共振推进器浸没在非均匀磁场中的加热机理

为了研究浸没在非均匀磁场中的电子回旋共振推进器（ECRT）的加热机理，基于ASIPP的电子回旋共振等离子体源进行了实验和模拟。已经发现，电子回旋共振的一次谐波对于在高磁场（0.0875 T）下的等离子体点火是必不可少的，而等离子体可以在没有低磁场（直到0.0170 T）的电子回旋共振的一次和二次谐波的情况下维持。径向空心密度分布的证据表明，具有强边缘加热作用的上部混合共振是低场ECRT的加热机制。还揭示了从电子回旋共振到上混合共振的加热模式转变。有趣的是 电子温度和电子密度随输入功率的变化经历了“延迟”跃迁，这可能与回旋加速器和电离所需的不同功率水平相关。莫罗...