Design and test of small helical generator with load current up to MA

The design and principal experiments of a multi branches helical EMG with a 25nH inductive load have been carried out in this paper. According to the results of the code MFCG8-7 based on the circuit model, an EMG-125 type generator has been designed and tested. The EMG-125 generator is of 900mm in length, 125mm in diameter, and the charging explosive weight 2.7kg. A series of experiments show that, there would be serious breakdowns inside the generator if the input current were out of the limit of 8kA (the limit of the input energy is about 2 kJ). In the case of input current 8kA, the peak current 3MA has been measured on the inductive load that is 0.3MA less than the calculated result without magnetic flux losses. The maximal energy on the inductive load is 100kJ with the peak gain of 50. The calculated results agree with the experimental results when the calibrated coefficient of magnetic flux losses is set as 0.03.