Spice Modeling of a FET-Switched Induction Accelerator Cell
LAWRENCE LIVERMORE NATIONAL LAB CA
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A PSpice model of an induction accelerator cell switched by field-effect transistors FETs has been developed to simulate the modulators circuit performance and induction core flux behavior. A FET switched induction cell has been built that generate 4-kV, 1 microsecond pulses at pulse rates exceeding 100 kHz. The circuit architecture provides for core reset between pulses and produces bursts of pulses that are variable in amplitude, pulse width and prf. The transistor switching array, energy storage capacitors, reset circuit, and cell core are all combined into a compact, low-impedance package. This high-prf induction cell is being developed as the accelerating element for a proposed heavy-ion recirculator, which is an arrangement of many small induction cells in a 30-m diameter circle. The recirculator will accept 10-MeV ions from a linear ion accelerator, under development at the Lawrence Berkeley Laboratory, and continue their acceleration to 60-MeV by repeatedly passing the ion beam through the many 5-kV cells. As the ions gain speed, the cell prf must also keep pace by increasing from 70 kHz to 200 kHz. Simple PSpice models have been used to predict B-H loop behavior in the magnetic core and to analyze circuit performance. Simulations of the induction cell will be presented and compared with experimental data.
- Electrical and Electronic Equipment