Abstract
This paper details the design, simulation, and optimization of a low-impedance high repetition rate magnetically insulated transmission line oscillator (MILO) driven by a compact Marx generator. The project goals require the MILO to generate an radio frequency (RF) pulse within the S-band frequency range with a peak output power greater than 1 GW with greater than 10% efficiency. Its design is based on a set of base equation which provide critical component dimensions applied to a three-dimensional model constructed within CST studio suite used in a particle-in-cell (PIC) simulation. Additional to the geometric model, simulation of the MILO with non-ideal material properties and a lumped element modeling of the Marx generator were performed. The results of these simulations then informed changes to the model as to the optimizing performance of the device. Within the framework of the model, the final MILO design achieves the design goals with an approximate RF peak power of 4.5 GW at 2.5 GHz operating in the TM 01 mode when an input driving pulse with a peak voltage of 600 kV while providing 58 kA is applied.
Highlights
High power microwave (HPM) sources continue to be a strong area of research for multiple applications
Continuing to the S-Band magnetically insulated transmission line oscillator (MILO) model defined in Figure 3b, the results show that average peak output power dropped from a maximum of 5 GW to approximately 4 GW, see Figure 8
The simulation of the S-band MILO with ideal materials confirmed that the dimensions from the design equations result in a baseline device which will meet the design goals
Summary
High power microwave (HPM) sources continue to be a strong area of research for multiple applications. Research within the field of plasma science employs HPM sources as a source for plasma experimentation [2]. This has led to research focused upon improvements in peak output power, power efficiency, repetition rate, and device lifetime with sources which do not require an externally applied electromagnetic field. During operation it generates electrical current strong enough to produce a self-insulating magnetic field and does not require an externally applied magnetic field for beam guidance. This makes the MILO a strong candidate for a practical, modern HPM source
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