Development of a Synthetic Diagnostic for electrostatic probes in weakly magnetized plasmas

In plasma physics, interpreting diagnostic signals is a challenging task, especially in weakly magnetized plasmas with complex geometry. Electric probes (Langmuir, emissive, or double) are powerful tools for retrieving local plasma parameters (electron density, plasma potential, electron temperature). However, interpreting their signals accurately is difficult and requires sophisticated models that account for their interaction with the plasma.

This internship aims to develop a synthetic diagnostic tool that can accurately reproduce signals measured by electrostatic probes used in weakly magnetized plasmas (VKP and MISTRAL). This representation will be implemented by integrating a geometric-physical model of the probe directly into a PIC (Particle-in-Cell) plasma code, yielding a self-consistent representation. This approach is crucial for closing the gap between laboratory diagnostics, observation, and plasma models.

Langmuir probes will be used to measure instabilities in laboratory plasmas and in Jupiter’s magnetosphere, offering a unique opportunity to connect laboratory plasma diagnostics with space plasma applications. This approach will enable us to produce data helpful for interpreting plasma diagnostics in both laboratory and space environments.

• Implement a variable-geometry electrostatic probe within a PIC code.

• Perform test cases to investigate the influence of the probe on plasma properties and signals.

• Compare the results of the synthetic diagnostic with experimental data and/or analytical models.

• Contribute to developing a new tool for interpreting plasma diagnostics in weakly magnetized plasmas.

• Duration: 5 months starting in 2025

• Profile: Master’s degree in plasma physics, computational physics, or related discipline

• Desired skills: Python, Fortran, numerical methods, plasma knowledge