Visible spectroscopy diagnostics are used to measure the wavelength spectra of radiation emitted by plasma in a tokamak. They are essential for understanding plasma-wall interactions and monitoring impurities.

To ensure high-quality and reliable measurements, this diagnostic must be carefully calibrated in wavelength, intensity, and viewing geometry.

The objective of this apprenticeship is to optimize the metrology of this diagnostic, with a focus on intensity calibration procedures.

The work will include:

• Estimating transmission coefficients of optical systems (telescope, optical fibers);
• Calibrating diffraction grating spectrometers;
• Characterizing the opto-electronic response of the detection camera;
• Developing automated and robust calibration procedures;
• Analyzing and quantifying measurement uncertainties.

In a second phase, you will contribute to the development of automated spectral analysis tools, including:

• Identification of impurity emission lines;
• Temporal tracking of impurities during experimental campaigns;
• Improving quantitative monitoring of plasma species.

This project is part of WEST tokamak Phase III and aims to significantly enhance diagnostic performance in terms of accuracy, robustness, and data exploitation.

You are currently enrolled in an engineering school or a Master’s degree in physics, photonics, or instrumentation.

Ideally, you have:

• Knowledge of visible spectroscopy and optical instrumentation;
• Experience or interest in calibration setups and experimental measurements;
• Data analysis skills (Python);
• Interest in measurement science and uncertainty analysis.