Design Of Pulse Forming Network Research Articles

Magnetic-spiker excitation of gas-discharge lasers

A review is presented on the use of magnetic-spiker circuits to electrically excite rare-gas-halide and CO2 gas-discharge lasers. The design and operation of the diode, switch, overshoot, and charge modes of magnetic-spiker excitation will be described. Special emphasis has been placed upon understanding the dynamical behaviour and saturation properties of the magnetic core material at high frequencies. The effect of voltage risetime, preionization, pulse-forming network design, and prefire on laser performance is also described. Experimental data are presented on a new and very simple magnetic-spiker circuit called the modified overshoot mode. A relatively long optical pulse magnetic-spiker KrF laser is also desribed which uses self-timed corona preionization initiated by the spiker circuit. The use of magnetic-spiker excitation to produce high output laser energies, high repetition rates, and long optical pulses is discussed. Applications of magnetic-spiker lasers in the field of medicine, microelectronics and materials processing will be reviewed.

A pulse forming network design for blocked-bore plasma armature experiments

Recent experimental studies on plasma armatures at the Applied Physical Electronics Research Center at the University of Texas at Arlington require the delivery of a single high-current pulse. The railgun diagnostic program now in progress requires a ramping current waveform with a continuously positive di/dt until peak current is delivered approximately 1 ms after circuit closure. This pulse forming network (PFN) is designed to power blocked-bore plasma armature studies being conducted on a section of the THUNDERBOLT prototype, SUVAC. The PFN design has an operating voltage range from 300 to 1400 V and is capable of delivering peak currents up to 200 kA.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

An interpolation technique in the design of pulse-forming networks

This paper presents a new method of synthesis of low-pass filters for pulse applications. A piecewise linear model is first introduced to define the phase characteristic of the idealized minimum phase network and then approximated by interpolation technique at equidistant points. The transient response to a unit step and the attenuation characteristic are controlled by two variable parameters which are determined by iterative procedure. The necessary computations are simple, since only linear equations are involved in computational process. The transient responses of the resulting filters are superior to other known systems and compare favourably even with the Schüssler filters with equi-ripple step response.