Exponential Impedance-Transformer Stalks Used for Magnetically Insulated Induction Voltage Adders

An exponential impedance-transformer stalk was proposed for magnetically insulated induction voltage adders (MIVAs). Based on a 10-cell TLCODE model, performances of stalks with linear, stepped, and exponential profiles were quantified and analyzed as a function of m (the ratio of the adder output impedance to the one that is driver matched, m ≥ 1). Simulation results show that when m ≥ 1.5, stalks with the exponential profile result to the highest adder output voltages with a reverse voltage ~7.5% of the dominative voltage, and the η (the ratio of the subtraction between adder peak voltages with exponential and stepped profiles to the one with stepped profile) increases as the m goes up (when m = 5, η is as much as 8%). Simulation results also indicate that with exponential impedance profile, the highest feeding voltage of the 10 cells is ~2 MV when 1 ≤ m ≤ 10, and it always occurs at one of the last five cells. Moreover, it is found that with the exponential profile, the reverse coefficient β (the maximum ratio of the reverse peak voltages to the nominal) is ~9.5%.