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Related Concept Videos

Van de Graaff Generator01:15

Van de Graaff Generator

Van de Graaff generators (or Van de Graaffs) are devices used to demonstrate high voltage due to static electricity that can also be used for research. Robert Van de Graaff first built one in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research.
Van de Graaff uses both smooth and pointed surfaces, conductors, and insulators to generate large static charges and, hence, large voltages. A substantial excess charge can be deposited on the sphere because it moves...
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An alternator converts mechanical energy into electrical energy that varies sinusoidally, resulting in AC current. Meanwhile, a DC generator converts mechanical energy into electrical energy, which are DC pulses with the same polarity. The construction of a DC generator is similar to that of an alternator, except that the pair of slip rings is replaced by a single split ring, also called a commutator. The commutator functions like a periodic rotary switch; it changes the contacts with the...
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Generator voltage control is crucial for maintaining the stable operation of synchronous generators and wind turbines. In older models, a DC generator driven by the rotor delivers DC power to the rotor's field winding, and the power is transferred through slip rings and brushes. In the latest models, static or brushless exciters are used. Static exciters rectify AC power from the generator terminals and then transfer the DC power directly to the rotor. Brushless exciters, on the other hand, use...
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Electric generators induce an emf by rotating a coil in a magnetic field. A simple alternator is an AC generator that creates electrical energy that varies sinusoidally with time. A simple alternator consists of a conducting loop that is placed inside a uniform magnetic field. The loop is connected to split rings connected to the external circuit with the help of brushes.
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Generation of Three-Phase Voltage01:21

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A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.
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Faraday Disk Dynamo01:23

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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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A compact submicrosecond, high current generator.

B M Kovalchuk1, A V Kharlov, V B Zorin

  • 1Institute of High Current Electronics, 2/3 Academichesky Ave., 634055 Tomsk, Russia.

The Review of Scientific Instruments
|September 4, 2009
PubMed
Summary

A new pulsed current generator was developed for plasma experiments. It delivers high currents with fast rise times and low jitter, offering a robust and cost-effective solution for pulsed plasma research.

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Area of Science:

  • Plasma Physics
  • Pulsed Power Systems

Background:

  • Pulsed plasma experiments require specialized high-current generators.
  • Existing generators may have limitations in performance, complexity, or cost.

Purpose of the Study:

  • To develop and characterize a novel pulsed current generator for pulsed plasma experiments.
  • To achieve high current output with fast rise times and low jitter.
  • To create a robust, simple, and cost-effective apparatus.

Main Methods:

  • Construction of a four-section parallel generator using capacitor banks (24 x 100 kV, 80 nF) and low-inductance components.
  • Incorporation of multigap spark switches commutating via six parallel channels.
  • Testing with inductive and liner loads, measuring current amplitude, rise time, and jitter.

Main Results:

  • Achieved 650 kA current amplitude with a 390 ns rise time into a 17.5 nH load at 100 kV.
  • Optimized generator inductance to 15 nH, resulting in a low impedance of ~0.08 ohms.
  • Demonstrated reliable operation between 70-100 kV with jitter < 5 ns.

Conclusions:

  • The developed pulsed current generator is a simple, robust, and cost-effective apparatus for pulsed plasma research.
  • Its low impedance and fast-switching capabilities ensure effective energy coupling with low-impedance loads like Z pinches.
  • The generator's straightforward operation and maintenance requirements make it highly practical.