Design of inductive cavity for 3 MV induction voltage adder

According to pulse driver and its load parameters, the designed specifications of 1.2 MV/70 ns are calculated for induction cell of inductive voltage adder(IVA). Considering the current efficiency and vacuum line insulation, the mechanical dimensions of cores are chosen. The pre-annealed amorphous cores with remanence ratio of 0.5 measured by experiments is produced, and the number of magnetic toroids is determined as no less than 6. The measured peak permeability of cores with flux density changing rate up to 30 T/μs is consistent with that derived by saturation wave model. The equivalent magnetization inductance and eddy loss resistance are respectively estimated as 7.3 μH and 139 Ω. By the empirical formula of critical breakdown field and the numerical analysis of electric field, the designing of electrical structure of IVA cell is completed, whose effectiveness is experimentally validated. A whole circuit model with parameters of designed induction cell is established for 3 MV IVA driver, by which the calculation waveforms of rod pin diode roughly accord with the experimental results.