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Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis

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Using neutral beams as a light ion beam probe (invited).

Xi Chen¹, W W Heidbrink², M A Van Zeeland³

¹Oak Ridge Institute for Science and Education, Oak Ridge, Tennessee 37831, USA.

The Review of Scientific Instruments

|November 29, 2014

Summary

The light ion beam probe (LIBP) measures plasma field fluctuations by detecting fast ion orbital displacements. This technique reveals instabilities like Alfvén eigenmodes and interactions with 3D fields.

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Area of Science:

Plasma physics
Fusion energy research
Diagnostic techniques

Background:

Plasma diagnostics are crucial for understanding fusion devices.
Internal plasma fields and fluctuations influence plasma confinement.
Existing methods may have limitations in probing fast ion behavior.

Purpose of the Study:

To introduce and validate the light ion beam probe (LIBP) technique.
To demonstrate LIBP's capability in detecting internal plasma fields and fluctuations.
To study the impact of instabilities and 3D fields on fast ions.

Main Methods:

Utilizing a light ion beam probe (LIBP) for in-situ ion generation.
Analyzing orbital displacements of fast ions using edge detectors.
Correlating detected signals with plasma instabilities (e.g., Alfvén eigenmodes) and applied 3D fields.
Comparing experimental measurements with simulation data.

Main Results:

LIBP successfully detected orbital displacements caused by Alfvén eigenmodes and resonant magnetic perturbations.
The technique revealed nonlinear interactions between fast ions and Alfvén eigenmodes.
Measurements were consistent with simulation results.

Conclusions:

LIBP is an effective diagnostic for probing internal plasma fields and fast ion behavior.
The technique provides insights into plasma instabilities and their impact on fast ions.
LIBP offers a versatile tool for fusion research under various plasma conditions.