Experimental studies of current-loss characteristics for coaxial magnetically-insulated-transmission line

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 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 , 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.