Publications related to Stator

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Gyrotrons are essential for electron cyclotron resonance heating (ECRH) in fusion reactors, making their efficient operation crucial for fusion energy. Past experiments revealed instability issues due to trapped electrons in the magnetron injection gun (MIG) region, causing undesired currents and operational failures. To address this, tight manufacturing tolerances are required for the MIG geometry~\cite{pago2}. We present findings of the TRapped Electrons eXperiment (T-REX) at the Swiss Plasma Center, desi

This thesis presents a comprehensive study on the application of composite magnets in two industrial scenarios: the development of a linear actuator and the enhancement of ski equipment with magnetic attachment systems. In both cases, non-uniform magnetization is employed, specifically in the form of a continuous adaptation of the Halbach array. In the first application, the thesis explores the replacement of sintered magnets, typically used in permanent magnet motors, with composite magnets to reduce prod

Negative triangularity (NT) magnetic configurations have recently gained attention as a promising route to achieve H-mode-like confinement without edge-localized modes and without a power threshold for access. While both core and edge confinement properties of NT have been extensively documented, consistently lower divertor target cooling and increased difficulty in achieving a detached regime have been observed. This work presents a comparative SOLPS-ITER modeling study of two Ohmic L-mode discharges in th

A slotless magnetically-levitated high speed motor had been designed and build prior to the beginning of this project. This report presents the work done to develop a slotted alternative design to this motor. In this study, the principle of magnetically-levitated motors for high speed application is presented. Pros and cons of main topologies are highlighted. An optimisation procedure of geometric parameters for slotted stator with a given rotor is developed and explained. The optimization is run for the ro

The geodesic acoustic mode (GAM) is a coherently oscillating zonal flow that may regulate turbulence in toroidal plasmas. Uniquely, the complete poloidal and toroidal structure of the magnetic component of the turbulence-driven GAM has been mapped in the T ...

In parallel to the direct contribution to the procurement phase of ITER and Broader Approach, CEA has initiated research & development programmes, accompanied by experiments together with a significant modelling effort, aimed at ensuring robust operation, ...

The objective of this project is to determine in an analytical way the modes of vibration of the stator of a brushless DC motor. The knowledge of these modes is important. Once the vibration modes are determined we can avoid their excitation and thus reduce the noise emitted by the motor and its stress. This task is already performed by the use of finite element methods but they have the disadvantage of hiding the relations between the geometry of the stator and the vibration frequencies. In the first part

Tunnel transport processes are considered in a square lattice of metallic nanogranules embedded into insulating host to model tunnel conduction in real metal/insulator granular layers. Based on a simple model with three possible charging states (+/- or 0) ...

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The Diocotron Instability in the Trapped Electrons Experiment T-REX and its Relevance to Electron Clouds in Gyrotron Guns

Realization of performance optimized continuous Halbach pattern in magnetic composites for diverse applications

Impact of Triangularity on Edge Transport and Divertor Detachment: a Solps-iter Study of Tcv L-mode Plasmas

Alternative, Magnetically-Levitated Motor Topologies for High Speed

Complete multi-field characterization of the geodesic acoustic mode in the TCV tokamak

Science and technology research and development in support to ITER and the Broader Approach at CEA

Vibration modes of the brushless DC motor

Transport processes in metal-insulator granular layers