Abstract
The performance of a 1 MV pulsed high-power linear transformer driver accelerator were extensively investigated based on a numerical approach which utilizes both electromagnetic and Monte Carlo simulations. Particle-in-cell calculations were employed to examine the beam dynamics throughout the magnetically insulated transmission line which governs the coupling between the generator and the electron diode. Based on the information provided by the study of the beam dynamics, and using Monte Carlo methods, the main properties of the resulting x radiation were predicted. Good agreement was found between these simulations and experimental results. This work provides a detailed understanding of mechanisms affecting the performances of this type of high current, high-voltage pulsed accelerator, which are very promising for a growing number of applications.
Highlights
Linear transformer driver (LTD) technology [1] is very promising for building compact, versatile and high voltage drivers for various applications, including flash x-ray radiography
In order to check the electrical properties of a single cavity, an electromagnetic simulation was performed using the LSP code for a particle-free cavity driving a coaxial line
The operation of a single LTD cavity was first modeled by a simplified equivalent circuit, which was adjusted in order to accurately reproduce the experimental data
Summary
Linear transformer driver (LTD) technology [1] is very promising for building compact, versatile and high voltage drivers for various applications, including flash x-ray radiography. One cavity is composed of a specific number of bricks connected in parallel which determine the desired cavity impedance In this architecture, a compression stage such as pulse forming line is no longer necessary, the circuit inductance being sufficiently low to allow direct production of a high power electrical pulse with duration less than 100 ns. The 1 MV LTD driver was initially built at “Commissariat à l’Energie Atomique” (CEA) as a first module of an 8 MV=48 Ω flash radiography machine [6] It was successfully tested and was capable of delivering a 1 MV output electrical pulse on a 6 Ω electron beam diode with a full width at half maximum of 75 ns [7]. The main concluding remarks about this numerical approach are drawn
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