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Updated: Jun 25, 2026

A Random-displacement Measurement by Combining a Magnetic Scale and Two Fiber Bragg Gratings

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Compact collimated fiber optic array diagnostic for railgun plasmas.

V Tang¹, J M Solberg, T J Ferriera

¹Lawrence Livermore National Laboratory, P. O. Box 808, Livermore, California 94551, USA.

The Review of Scientific Instruments

|February 5, 2009

Summary

A new fiber optic diagnostic precisely measures railgun armature plasma light emission. This tool provides millimeter spatial and submicrosecond temporal resolution for advanced plasma research.

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Area of Science:

Plasma Physics
High-Energy Physics
Diagnostic Technology

Background:

Railgun technology relies on understanding armature plasma dynamics.
Accurate measurement of plasma properties is crucial for railgun performance optimization.
Existing diagnostics may lack the required spatial and temporal resolution.

Purpose of the Study:

To develop and validate a novel fiber optic diagnostic for railgun armature plasmas.
To achieve millimeter spatial and submicrosecond temporal resolution in plasma emission analysis.
To enable detailed study of plasma behavior in railgun experiments.

Main Methods:

Design and construction of a compact, 16-channel collimated fiber optic array.
Integration of the diagnostic into a railgun experimental setup.

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Acquisition and analysis of plasma light emission data.

Main Results:

The diagnostic successfully provided high-resolution data on railgun armature plasma.
Measured plasma velocities, oscillations, and dimensions were obtained.
Data was compared with one-dimensional simulation results, showing good agreement.

Conclusions:

The developed fiber optic diagnostic is effective for studying railgun armature plasmas.
The techniques are adaptable for other dense plasma and railgun experiments.
This diagnostic advances the capability for precise plasma characterization.