Abstract:
Background Repetitive all-solid-state pulsed power generators are essential for applications such as high-energy physics, accelerators, and industrial processing, yet conventional Marx generators often rely on gas spark gaps or magnetic switches, which suffer from high jitter, limited lifetime, and poor repetition rates. Fast semiconductor switches, while improving solid-state operation, face challenges in achieving nanosecond rise times and synchronous series-stacking at high voltages.
Purpose This study therefore aims to develop a high-voltage, high-repetition-rate all-solid-state Marx generator that overcomes these limitations by employing a laser-triggered multi-gate semiconductor switch (LIMS) as the primary switching element, achieving ultra-low jitter, fast rise time, and stable repetitive operation at 100 kV and 100 Hz.
Methods A LIMS is used for its sub-nanosecond jitter and fast turn-on capability, and two LIMS switches are connected in series to form a 13 kV, 10 kA module requiring only 2 mJ trigger energy per module. The Marx generator consists of eight series stages, each with a 100-nF capacitor charged by a pulse transformer in boost mode, and the timing and repetition frequency of both the pulse charging power supply and the laser trigger are precisely regulated. Testing was conducted with an 88 Ω resistive load.
Results At a stage charging voltage of 13 kV, the Marx generator produces a 100 kV high-voltage pulse across the 88 Ω load, featuring an 8 ns rise time and a single-pulse energy of 62.5 J. By precisely controlling the trigger timing and repetition frequency, the system achieves stable operation at 100 Hz and 100 kV.
Conclusions In conclusion, the proposed LIMS-based all-solid-state Marx generator successfully delivers repetitive 100 kV pulses with nanosecond rise time, low jitter, and high stability at 100 Hz, providing a promising solid-state alternative to traditional gas-switched or magnetics-based pulsers suitable for demanding high-power, high-repetition-rate applications.
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