Concept

Damping factor

Publications associées (50)

Electrical model of the Alfvén eigenmode exciter on JET

Ambrogio Fasoli, Duccio Testa, Theodoros Panis

The TAE antenna system on JET is used to drive intermediate and high n Alfvén Eigenmodes (AEs) into the plasma so as to study their properties and estimate their stability by measuring their damping rates as a function of the various plasma parameters. In ...

2008

From the electrical shunting of a loudspeaker to active impedance control

Hervé Lissek, Florian Sandoz

Variable acoustic properties can be obtained on an electroacoustic transducer’s voicing face by very basic control strategies, among which are the shunting of the loudspeaker (shortcut, variable electric load, or negative resistance disposals). It is prove ...

2008

Precise Velocity Control of a Hard Disk Drive

The ramp technology was integrated in the Hard Disk Drive a couple of years ago, this technology allows a safer parking position for the heads, but also allow the heads to fly closer from the media, increasing the data density. The Load and Unload operatio ...

2007

A Novel Air-Gap Monitoring System For Large Low Speed Hydro-Generators.

Jean-Jacques Simond, Mai Tu Xuan, Roland Wetter, Stefan Keller

This paper describes a novel and patented air-gap monitoring system for large low speed synchronous hydro-generators. This new system is based on inductive sensors, it is able to measure in real time a static or a dynamic rotor eccentricity, a stator or a ...

2006

Thick-Film Radial Position Sensor for High Temperature Active Magnetic Bearings

Roland Siegwart, Thomas Maeder, Luc Burdet, Beat Aeschlimann

This paper presents the development of radial eddy-current position sensors for high temperature active magnetic bearing (AMB) applications. Thick-film technology was used to realize silver coils printed on ceramic substrates. Long term measurements showed ...

2006

Limiting Amplifiers for Next-Generation Multi-Channel Optical I/O Interfaces in SoCs

Yusuf Leblebici, Paul Victor Georges Muller

We present two fully differential limiting amplifiers with and without inductive peaking, designed and integrated in 0.18mm digital CMOS technology. The key design trade-offs, the importance of inductive coupling between neighboring channels, as well as th ...

2005

Experimental study of the dependence of the damping rate of n=1 TAEs on the on-axis safety factor and toroidal rotation shear

Ambrogio Fasoli, Duccio Testa

The dependence of the measured damping rate (gamma/omega) on the value of the safety factor on axis (q(0)) and of the toroidal rotation shear has been experimentally determined for n = 1 toroidal Alfven eigenmodes (TAEs) in JET limiter plasmas with a monot ...

2005

Measurement of the damping rate of n=1 toroidal Alfven eigenmodes as a function of the neutral beam heating power and plasma beta on JET

Ambrogio Fasoli, Duccio Testa

The dependence of the measured damping rate upon the neutral beam heating power (P-NBI) and plasma beta has been experimentally investigated for n = 1 toroidal Alfven eigenmodes (TAEs) in JET limiter plasmas with a monotonic safety factor profile and low e ...

2003

Experimental test of damping models for n=1 toroidal Alfven eigenmodes in JET

Olivier Sauter, Ambrogio Fasoli, Duccio Testa

The damping rate of the n = 1 toroidal Alfven eigenmodes (TAE) mode in Ohmic-heated JET plasmas has been measured and compared with the prediction of the kinetic NOVA-K code, which includes electron and ion Landau damping of the global shear-Alfven wave fi ...

2003

Loudspeaker behaviour under incident sound fields

Véronique Adam

Within the framework of an outdoor active noise control project, a need arose, namely to establish whether electrodynamic loudspeakers are likely to be affected by the primary noise or by the interactions between them. The aim of this thesis is therefore t ...

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