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Building Langmuir Probes and Emissive Probes for Plasma Potential Measurements in Low Pressure, Low Temperature Plasmas

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Dual Langmuir-probe array for 3D plasma studies in TORPEX.

M Baquero-Ruiz¹, F Avino¹, O Chellai¹

¹Swiss Plasma Center (SPC), Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.

The Review of Scientific Instruments

|December 3, 2016

Summary

A new Langmuir probe (LP) array diagnostic was developed for the TORPEX device to reveal plasma

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Area of Science:

Plasma physics
Fusion energy research
Diagnostic techniques

Background:

Understanding plasma behavior is crucial for fusion energy.
TORPEX requires advanced diagnostics for 3D plasma characterization.
Existing methods may lack comprehensive 3D spatial resolution.

Purpose of the Study:

To design and implement a novel Langmuir probe (LP) array diagnostic system.
To enable the determination of basic three-dimensional (3D) plasma features in TORPEX.
To provide comprehensive poloidal cross-section coverage at distinct toroidal locations.

Main Methods:

Installation of two identical LP arrays at opposing sides of the TORPEX apparatus.
Utilizing cross-correlation studies of signals from the LP arrays for 3D information extraction.
Employing advanced front-end electronics for high signal-to-noise ratio.
Reconstructing 3D plasma structures by combining data from all probes.
Tracking evolving plasma structures through data analysis.
Incorporating a radial linear-motion mechanism for probe positioning adjustments.

Main Results:

Successful design and installation of the LP array diagnostic.
Demonstrated capability to extract basic 3D plasma information through cross-correlation.
Achieved reconstruction of elementary 3D plasma structures at each time step.
Enabled tracking of plasma structure evolution over time.
High signal-to-noise performance of the front-end electronics confirmed.

Conclusions:

The new LP array diagnostic effectively provides 3D plasma insights in TORPEX.
The diagnostic facilitates the study of plasma dynamics and structure evolution.
This advancement enhances the diagnostic capabilities for fusion research in TORPEX.