Digital Phasemeter Based On a System-on-chip for

Il y a 2 mois

Marseille, France CEA Temps plein

Description du poste

**Domaine**:

- Instrumentation, métrologie et contrôle

**Contrat**:

- Stage

**Intitulé de l'offre**:

- Digital phasemeter based on a system-on-chip for measuring plasma electron density using interferometry

**Sujet de stage**:

- "A heterodyne interferometer plays a pivotal role in monitoring and controlling magnetically confined plasma. This technique enables measuring every millisecond the average electron density along where a far-infrared laser beam passes through the plasma. As the probing beam interacts with plasma electrons, it experiences a time delay, dependent on electron density. The primary objective is to measure this phase.
- At IRFM, the WEST tokamak employs interferometry diagnostics with a phase-measurement-dedicated electronic device based on the zero-crossing technique. This device can count interference fringes and comprises controlled amplifiers, ADCs, zero-crossing discriminators, and a programmable logic circuit, similar to the Altera Cyclone® III FPGA. Presently, we are contemplating improvements to this phasemeter concerning metrology and obsolescence. "

**Durée du contrat (en mois)**:

- 6 months

**Description de l'offre**:

- "The objective of this internship is to make a meaningful contribution to the development of a cutting-edge, compact, and fully digital phasemeter. To achieve this goal, several key tasks have been outlined as follows.- 1. The first step involves identifying and defining the essential technical specifications. This includes parameters such as bandwidth, sampling rate, bit-depth, and noise reduction. These requirements will be derived from the existing zero-crossing-based phasemeter to ensure a solid foundation for the new design.
- 2. In the second phase, we will design and implement a quadrature demodulation algorithm. This algorithm, along with necessary digital filters, will be integrated into a Zynq System-on-Chip (SoC). This step is crucial in achieving accurate and precise phase measurements.
- 3. The final stage of the internship will involve creating a comprehensive test bench. This bench will be used to evaluate the performance enhancements achieved by the new phasemeter. Key performance indicators will include signal-to-noise ratio and robustness, particularly in terms of fringe-jump resilience. Importantly, the system must meet stringent hard real-time requirements to be applicable in plasma control scenarios.- By following these steps, this internship aims to enhance the WEST interferometry diagnostic, thereby contributing to a more reliable and efficient plasma control system. In addition, the student will have the opportunity to gain experience in comprehensive SoC design and become acquainted with a large scientific facility like a tokamak."**Moyens / Méthodes / Logiciels**:

- System-on-Chip, VIVADO, C/C++, Mixed-Signal Oscilloscope, Arbirtrary Waveform Generator, Python/Matl
- Analog and digital electronics, hardware-description language, signal processing, computer science and technology, knowledge in physicsLocalisation du poste

**Site**:

- Cadarache

**Localisation du poste**:

- France, Provence-Côte d'Azur, Bouches du Rhône (13)

**Ville**:

- F-13108 SAINT PAUL LEZ DURANCE cedex

**Langues**:

- Anglais (Intermédiaire)

**Diplôme préparé**:

- Bac+5 - Diplôme École d'ingénieurs

**Formation recommandée**:

- Electronics and computer engineering

**Possibilité de poursuite en thèse**:

- Non

Demandeur

**Disponibilité du poste**:

- 01/02/2024

Informations générales

**Entité de rattachement**:
Le CEA est un acteur majeur de la recherche, au service des citoyens, de l'économie et de l'Etat.
- Il apporte des solutions concrètes à leurs besoins dans quatre domaines principaux : transition énergétique, transition numérique, technologies pour la médecine du futur, défense et sécurité sur un socle de recherche fondamentale. Le CEA s'engage depuis plus de 75 ans au service de la souveraineté scientifique, technologique et industrielle de la France et de l'Europe pour un présent et un avenir mieux maîtrisés et plus sûrs.
- Implanté au cœur des territoires équipés de très grandes infrastructures de recherche, le CEA dispose d'un large éventail de partenaires académiques et industriels en France, en Europe et à l'international.
- Les 20 000 collaboratrices et collaborateurs du CEA partagent trois valeurs fondamentales:
- La conscience des responsabilités
- La coopération
- La curiosité

**Référence **:2023-30066**Description de l'unité**:

- Le CEA est un acteur majeur de la recherche, du développement et de l'innovation, au cœur des enjeux sociétaux et en particulier de la transition énergétique. Dans ce domaine, des recherches de pointe sont menées au sein de l'Institut de Recherche sur la Fusion par confinement Magnétique (IRFM) à Cadarache (13), dont l'objectif est le développement d'une source d'énergie durable et respectueuse de l'environnement ba

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