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Current Density

Current Density

The total amount of current flowing through one unit value of a cross-sectional area is referred to as current density. If the current flow is uniform, the amount of current flowing through a conductor is the same at all points along the conductor, even if the conductor area varies. The current density consists of the local magnitude and direction of the charge flow, which varies from point to point. Current density is measured in amperes per meter square, and direction is defined as the net...

Ammeter

Ammeter

An ammeter is a current measuring instrument. In the circuit, it is represented by the symbol A. The ammeter is placed in series with the device or component to measure the current. A series connection is used because objects in series have the same current passing through them. If a circuit has multiple resistors and the current needs to be measured in each resistor, the number of ammeters required depends on whether the circuit is in series or parallel.
When an ammeter is used to measure the...

Galvanometer

Galvanometer

Common devices, including car instrument panels, battery chargers, and inexpensive electrical instruments, measure potential difference (voltage), current, or resistance using a d'Arsonval galvanometer. This electromechanical instrument is also known as a moving coil galvanometer.
The galvanometer consists of two concave-shaped permanent magnets, providing a uniform radial magnetic field in the annular region. In the center, a pivoted coil of fine copper wire is placed in the uniform magnetic...

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Related Experiment Video

Updated: May 12, 2026

X-ray Beam Induced Current Measurements for Multi-Modal X-ray Microscopy of Solar Cells

X-ray Beam Induced Current Measurements for Multi-Modal X-ray Microscopy of Solar Cells

Published on: August 20, 2019

Note: a real-time beam current density meter.

Junliang Liu¹, Deyang Yu, Fangfang Ruan

¹Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.

The Review of Scientific Instruments

|April 6, 2013

Summary

This summary is machine-generated.

A new real-time beam current density meter accurately measures charged particle beams. This device uses beam collimation and electron suppression for precise mean current density determination.

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Area of Science:

Physics
Engineering
Instrumentation

Background:

Accurate measurement of charged particle beam characteristics is crucial for many scientific and industrial applications.
Existing methods for beam current density measurement may have limitations in real-time applications or accuracy.

Purpose of the Study:

To develop and validate a novel real-time beam current density meter.
To provide a reliable instrument for measuring the mean current density of charged particle beams.

Main Methods:

Development of a real-time meter utilizing beam collimation.
Simulation of secondary electron suppression and beam deflection.
Experimental testing with a 105 keV Argon (Ar(7+)) ion beam.

Main Results:

Successful development of a functional real-time beam current density meter.
Demonstrated capability to measure mean current density through beam collimation.
Validation of the meter's performance with a specific ion beam.

Conclusions:

The developed meter offers a viable solution for real-time beam current density measurement.
The employed methods ensure accurate readings by controlling secondary electrons and beam path.
This instrument is suitable for applications requiring precise characterization of charged particle beams.