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We designed a fuse opening switch for the purpose of generation of high voltage pulses. The fuse opening switch was made with copper foil. The fuse opening switch was tested at a capacitor powered circuit discharged by a high current triggered vacuum switch. The experimental results were compared with simple numerical calculations. We measured several electrical parameters for a circuit composed of...
Laboratory facility GITaRa-4 was put into operation for development of plasma current opening switch used in experiments with MCG powering on the program [1]. Capacitor storage, consisting of four pulsed current generators of 8 muF each and composite cable line, is used as a current source. Short circuit current is about 1.7 MA at rise time of 2.5 mus. Works on experimental development of plasma opening...
Study of the triggered plasma opening switch (TPOS) characteristics is in progress via an ion current collection diagnostic (ICCD), in addition to offline apparatus. This initial ion current collection diagnostic has been designed, fabricated, and tested on the TPOS in order to explore the opening profile of the main switch. The initial ion current collection device utilizes five collectors which...
PIM is a water filled Blumlein connected, in parallel, to one or two 1.5 MV, cavities which inductively add voltage on a high impedance vacuum transmission line to a load diode operating at 1-3 MV. The radiographic performance of this IVA pulsed power machine depends on the inductive rise-time of the Blumlein switches. Selection of either one or two simultaneously closing switches on PIM was used...
Most high-temperature mechanical properties of metals are available for isothermal conditions obtained after heating the specimen for several hours. However, in pulsed-power applications, materials are adiabatically heated by rapid deposition of energy. Experimental evidence from electron beam heating indicates that high- temperature mechanical properties significantly depend on the rapidity and duration...
The Explosively-Formed Fuse (EFF) is a high-power opening switch that uses an explosive charge to interrupt current flow in an aluminum conductor [1]. As such we expected the foil's resistance to increase with increasing current density by Joule heating. Yet an analysis of a large number of experiments clearly showed the opposite was true; there was a strong negative correlation between the peak resistance...
A conventional pulsed power technology has been combined with an explosive pulsed power technology to produce an autonomous high voltage power supply. The power supply contained an explosive-driven high-voltage primary power source and a power-conditioning stage. Two types of ultracompact explosive primary power sources were used, one of which was based on the physical effect of shock wave demagnetization...
The Nevada Shocker powered by nine 0.28 muF capacitors in a Marx Bank configuration yielding a maximum standup voltage and energy of 540 kV and 4.54 kJ respectively drives a 14.2 nF (in charging mode) Blumlein. The Blumlein with self-breaking water switch generates a 46 ns (theory) to 50 ns (experimental) pulse guided by a 7 Omega discharge transmission line to a parallel plate diode in a 10-6 Torr...
The ZR gas switch, located between the intermediate store capacitor (I-Store) and the pulsed forming line (PFL), requires a laser pulse for its triggering. There are several routes for the beam to reach the gas switch but all of them cross over the high voltage regions. The Z laser tube crosses over the outer to inner PFL electrodes with a voltage difference no larger than 3.5 MV. The ZR gas switch...
Mercury became operational in a stepwise manner to test the machine components after modifications and reassembly at NRL. To avoid damaging the MIVA, extensive testing of the laser and PFL output switches was performed using dummy loads. Finally, the PFLs were connected to the MIVA and Mercury was fired into a simple cylindrical diode load with a Marx charge voltage up to 75 kV. Measured MIVA currents...
Summary form only given. A flux compression experiment is being designed for the Atlas pulsed power facility. The purpose is to investigate generation of megagauss fields with liner technology in the geometry needed for compression of a stabilized diffuse z pinch.1 To survey possible parameters quickly and conveniently, a semi-analytic model has been developed that computes liner motion under the...
In the three joint VNIIEF/LANL experiments RHSR-0,1,2 with a disk EMG and a three-layer liner system (Al-dielectric-Cu) a method of radial radiography was used to study growth of perturbations amplitude at the boundary between copper layer and polyethylene (in experiments RHSR-0,1) and water (in experiment RHSR-2); the growth occurs during the evolution of the Raleigh-Taylor instability of this boundary.
Development results of a wide-range medical ozonator equipped with ozone concentration measurement device are presented in the paper. The ozone synthesis was carried out with a microsecond pulsed-periodical barrier discharge with automatic preliminary ionization. The ozone output concentration is 0.1-80 mg/1, volumetric rate of an output flow is from 0.1 1/min up to 1 1/min. To measure the ozone concentration...
A systematic design tool for dual resonance pulse transformers has been developed and implemented. The specific transformer geometries studied are those composed of two helical coaxial, single layer coils on cylindrical winding forms. This design is typical of that currently in use and has been described in the literature. The requisite formulas for primary, secondary and mutual inductance are described...
Measurements on a 30 kV electron gun with ten independent cathodes, operating in a 6.5 Tesla (T) magnetic field are presented. An earlier paper covered the design of this electron gun. Experimental results are compared to model predictions. Beam current is compared to theoretical space charge limited flow.
PIM is a water filled Blumlein connected, in parallel, to one or two 1.5 MV, cavities which inductively add voltage on a high impedance (100 Ohm) vacuum transmission line. A self-magnetic pinch configured diode was tested on this 1-3 MV IVA pulse power machine and an investigation into the performance of this radiographic diode was made using simple hollow cathodes with a plane, grounded anode configuration...
Dielectric flashover along insulators in vacuum has been sufficiently researched in the past. Less studied, but of similar importance, is surface flashover at atmospheric pressures and the impact of various electrode geometries, humidity, and type of gas present. Previous research has shown distinct arc behavior in air and nitrogen for an electrode geometry in which the electric field lines curve...
Tetra Corporation has developed a new high dielectric constant insulating oil, tetra high energy storage oil (THESO) (Patent pending), for pulsed power applications. In this paper we discuss the measurement of the dielectric properties of the oil, in particular the dielectric strength, dielectric constant, and conductivity. We also discuss the water absorption properties and compare energy storage...
The Mercury generator is a ~6 MV, ~360 kA, ~50 ns magnetically-insulated voltage adder that recently became operational at the Naval Research Laboratory [1,2], providing a radiation environment of interest to both the DOE and DoD communities. To establish the bremsstrahlung dose and dose-rate production of Mercury, a series of large-area electron-beam (e-beam) diode experiments are performed in which...
With a fast coaxial setup using a needle/plane geometry and a high sensitivity electrometer, conduction mechanisms in transformer oil at varying temperature and hydrostatic pressure are quantified. There are 3 stages in the conduction process prior to breakdown for highly nonuniform field geometries. Stage I is characterized by a resistive current at low fields. Stage II consists of a rapid rise in...
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