基于“强光一号”装置设计了1 m长、2 cm阴阳极间隙的同轴型磁绝缘传输线(MITL)实验平台, 实验研究了负载阻值0, 2.07, 4.12和5.68 Ω条件下该MITL沿线电流损失特性。实验结果显示: 满足磁绝缘准则条件下, 该MITL沿线电流损失主要发生在阻抗剧变区域; 2.07 Ω负载阻值条件下, 传输于阴阳极间隙的真空电子流可达传输线电流的17.4%, 并且其比例随着负载阻值的增大而不断增大。基于空间电子流理论, 对上述实验现象进行了定性的机理分析与解释。

A test stand of one-meter long coaxial magnetically-insulated-transmission line (MITL) with 2 cm anode-cathode gap was designed and constructed based on the “Qiangguang-Ⅰ” facility. Current-loss characteristics of MITL with the load resistance of 0, 2.07, 4.12 and 5.68 Ω were experimentally studied. Experimental results show that current loss along the MITL which fits in with the principle of magnetic insulation mainly occurred in the areas with abrupt change of geometrical impedance. And it is also shown that with the load resistance of 2.07 Ω, the ratio of the vacuum electron flow between anode and cathode gap to the transmission-line current is close to 17.4%, and it increases gradually with the enhancement of the load resistance. Finally, based on theories of the space-charge flow, the experimental phenomena mentioned above were qualitatively analyzed and discussed.