Abstract
We present the design and test results of an induction cavity, which is a full-scale prototype cell of a prospective six-stage induction voltage adder. This induction cell runs in positive polarity and the output transmission line operates in the vacuum insulation state. The design methods and configurations of the azimuthal transmission line, insulation stack, magnetic core, cathode plate, and output transmission line in the induction cell are given in detail. The induction cavity is driven by one pulsed power system consisting of a tesla transformer, intermediate storage capacitor, laser triggered gas switch, pulse forming line, self-breaking oil switch, and a water transmission line. A maximum voltage about 1.05 MV could be achieved across one $7.0\text{ }\text{ }\mathrm{\ensuremath{\Omega}}$ water resistor load. A full circuit model including the primary energy storage section and pulse forming section is proposed. The circuit model also includes the two-dimensional circuit model of the induction cavity [Phys. Rev. Accel. Beams 20, 020401 (2017)]. The voltage and current waveforms across the feed port, azimuthal transmission line, insulation stack, and resistor load obtained during the experiment are compared with the circuit simulation results. It demonstrates that they can agree with each other very well.
Highlights
The induction voltage adder (IVA) has been widely used for many applications, such as flash radiography [1,2], detection of fissile material [3], gamma-ray simulation [4], and serves as the injector for the linear induction accelerator [5]
This induction cell runs in positive polarity and the output transmission line operates in the vacuum insulation state
The design methods and configurations of the azimuthal transmission line, insulation stack, magnetic core, cathode plate, and output transmission line in the induction cell are given in detail
Summary
The induction voltage adder (IVA) has been widely used for many applications, such as flash radiography [1,2], detection of fissile material [3], gamma-ray simulation [4], and serves as the injector for the linear induction accelerator [5]. The driving section of each induction cavity operates at a relatively low voltage, and their summed voltages are restricted to a small region which is usually termed as output transmission line. This is very helpful to increase flexibility and advance reliability of the machine. The above-mentioned advantages have prompted the instigation of an IVA research program to investigate the flash radiography in our laboratory This machine would produce a peak load voltage of 4.0 MV into an approximate 40.0 Ω rod-pinch diode (RPD). The expected x-ray dose at 1.0 m and source diameter are about 10.0 rad and 1.5 mm, respectively This prospective IVA is composed of six stages.
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