基于粒子模拟研究了长磁绝缘传输线的电压电流关系、自限制流状态和损失前沿传播速度的变化规律,验证了稳态流假设下建立的不同磁绝缘传输线模型在描述长磁绝缘传输线工作状态时的精确程度。结果表明: Mendel模型在描述长磁绝缘传输线电压电流关系时较精确; Rescaled模型计算长磁绝缘传输线自限制流状态下的阳极电流较精确; 损失前沿在长磁绝缘传输线中的传播速度沿着能量传输方向是动态变化的,其速度的大小与输入电压上升速率相关。

The relationships between voltage and current, self-limited flow and loss front propagation speed of long MITL were studied based on particle-in-cell simulation. Different MITL models which were established under the steady-state assumptions were compared. Mendel model is more accurate than parapotential model and collisional model when depicting the relationship between long MITL voltage and current. Rescaled model is more accurate than Mendel model and parapotential model when computing the anode current at self-limited flow of long MITL. The loss front propagation speed is variable along power flow direction in long MITL, the speed is related with rise rate of input voltage.