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Related Concept Videos

Faraday Disk Dynamo01:23

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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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Faraday's law state that the induced emf is the negative change in the magnetic flux per unit of time. Any change in the magnetic field or change in the orientation of the area of the coil with respect to the magnetic field induces a voltage (emf). The magnetic flux measures the number of magnetic field lines through a given surface area. Magnetic flux is estimated from the integral of the dot product of the magnetic field vector and the area vector. The negative sign describes the...
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A parallel-plate capacitor with capacitance C, whose plates have area A and separation distance d, is connected to a resistor R and a battery of voltage V. The current starts to flow at t = 0. What is the displacement current between the capacitor plates at time t? From the properties of the capacitor, what is the corresponding real current?
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Edwin H. Hall, in the year 1879, devised an experiment that could be used to identify the polarity of the predominant charge carriers in a conducting material. From a historical perspective, this experiment was the first to demonstrate that the charge carriers in most metals are negative.
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A device consisting of two electrical conductors that are separated by a distance and used to store electrical charges is called a capacitor. The space between the conductors is either a vacuum or an insulating material, called a dielectric. Capacitors have many applications, ranging from filtering static from radio reception to energy storage in heart defibrillators.
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Development and first experimental tests of Faraday cup array.

J Prokůpek1, J Kaufman2, D Margarone1

  • 1Institute of Physics of the AS CR, v. v. i., ELI-Beamlines Project, Na Slovance 2, 182 21 Prague 8, Czech Republic.

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|February 13, 2014
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Summary
This summary is machine-generated.

A novel Faraday cup array detects high-energy charged particles from laser-matter interactions using time-of-flight. This system visualizes ion current density spatial distribution and time evolution in plasmas.

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Area of Science:

  • Plasma Physics
  • Particle Detection
  • Laser-Matter Interactions

Background:

  • High-intensity laser-matter interactions produce high-energy charged particles.
  • Characterizing these particles is crucial for understanding plasma dynamics.
  • Existing diagnostic methods like laser optical interferometry have limitations in visualizing ion currents.

Purpose of the Study:

  • To develop and demonstrate a new type of Faraday cup for detecting high-energy charged particles.
  • To enable real-time, two-dimensional visualization of ion current density and its time evolution.
  • To reconstruct the spatial distribution of ion current density in subcritical plasma regions.

Main Methods:

  • Development and deployment of an array of novel Faraday cups.
  • Utilizing the time-of-flight technique for particle detection and energy measurement.
  • Employing an ad hoc data analysis procedure for reconstructing spatial and temporal distributions.

Main Results:

  • Successful demonstration of the Faraday cup array as a real-time detector.
  • Reconstruction of the spatial distribution of ion current density in subcritical plasma.
  • Visualization of the time evolution of ion currents, offering insights beyond standard interferometry.

Conclusions:

  • The new Faraday cup array provides a unique method for two-dimensional visualization of ion currents from laser-generated plasmas.
  • The diagnostic system allows for detailed analysis of particle emission characteristics.
  • Advantages and limitations of the system were discussed, paving the way for future improvements.