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Table of contents
1 Introducing the protagonists
1.1 Introduction to plasmas
1.1.1 Plasmas and their physical parameters
1.1.2 Natural plasmas
1.1.3 Technological applications
1.2 Mistral device
1.2.1 General description
1.2.2 Mistral parameters
1.2.3 Existing diagnostics and tools
1.2.4 Mistral plasma emissivity
1.3 Coherent rotating modes
1.3.1 General description
1.3.2 Existing work
2 Tomography
2.1 Algebraic description of the tomography problem
2.1.1 Finite volumes scheme
2.1.2 Finite elements scheme
2.2 Tomography inversion
2.3 Numerical tomography code
2.3.1 Description
2.3.2 Benchmarking
2.4 Comments on the chords distributions
2.5 Conclusion
3 From a single sensor tomography diagnostic
3.1 Mono-sensor tomography set-up
3.1.1 Trigger system
3.1.2 Sensors and acquisition systems
3.1.3 Optomechanical configuration
3.2 Experimental tomography acquisitions
3.3 Conclusion
4 To the 128 synchronous sensors diagnostic
4.1 System overview
4.2 Hardware description
4.2.1 Optical sensors
4.2.2 Acquisition board
4.2.3 Optomechanical configuration
4.3 Installation
4.3.1 Collimation and alignment
4.3.2 Acquisition device check-up
4.3.3 Calibration and linearity
4.4 Experimental measurements
4.4.1 Raw signal
4.4.2 Reconstructed emissivity
4.5 Conclusion
5 Characterisation of rotating modes
5.1 Radial and azimuthal structure of rotating modes
5.2 Parametric study of rotating modes
5.2.1 Variation of the azimuthal mode number
5.2.2 Hysteresis of the plasma
5.2.3 Radial electric field and plasma potential
5.3 Conclusion
Conclusion
