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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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A Faraday disk dynamo is a DC generator, producing an emf that is constant in time. It consists of a conducting disk that rotates with a constant angular velocity in the magnetic field, perpendicular to the disk's plane. The rotation of the disk causes a change in magnetic flux, which induces an emf, causing opposite charges to develop on the rim and in the center of the disk. The polarity of the induced emf can be determined by the direction of the magnetic field and the direction of the...
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Direct current is a flow of electric charge in only one direction and has a steady state of constant voltage in the circuit. Rectifiers, batteries, commutator-equipped generators, and fuel cells are some examples of devices that generate direct current. Nowadays, most applications use a time-varying voltage source. Alternating current is a flow of electric charge that periodically reverses direction. An alternating current is produced by an alternating emf that is generated in a power plant. If...
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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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Label-free Isolation and Enrichment of Cells Through Contactless Dielectrophoresis
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A compact, high-current pulse power generator for experiments on low-impedance loads.

Ankur Chowdhury1,2, Alok K Saxena1, K D Joshi1,2

  • 1Bhabha Atomic Research Centre, Mumbai 400085, India.

The Review of Scientific Instruments
|February 19, 2026
PubMed
Summary

A new compact pulse power generator delivers 10 kJ of energy for dynamic compression experiments. This robust, low-cost apparatus is ideal for laboratory settings, enabling high-pressure solid and plasma research.

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Area of Science:

  • Physics
  • Engineering

Background:

  • High-pressure dynamic compression requires specialized pulse power generators.
  • Existing systems may be large, expensive, or complex for laboratory use.

Purpose of the Study:

  • To develop a fast, compact, and cost-effective pulse power generator.
  • To enable high-pressure dynamic compression studies in solids and pulsed plasma.

Main Methods:

  • Designed a generator with four concentric capacitor-switch units.
  • Utilized low-inductance 2100 nF/55 kV capacitors and multi-gap spark gap switches.
  • Characterized performance under short-circuit conditions with a 50 kV charging voltage.

Main Results:

  • Achieved a stored energy of ~10 kJ at 50 kV charging voltage.
  • Generated current pulses of 735 kA with a 600 ns rise-time.
  • Overall dimensions are 985x985x760 mm³, weighing ~500 kg.

Conclusions:

  • The developed generator is a simple, low-cost apparatus for dynamic compression experiments.
  • Its compact size, low impedance (~0.076 Ω), and ambient air operation make it suitable for low-impedance loads in labs.