Concept

Pièges à ions de Paul et de Penning

Publications associées (130)

Analysis of ion cyclotron heating and current drive at omega approximate to 2 omega(cH) for sawtooth control in JET plasmas

Ion cyclotron heating and current drive at omega approximate to 2omega(cH) in JET deuterium plasmas with a hydrogen concentration n(H)/(n(D)+n(H)) in the range of 5-15% are analysed, comparing results of numerical computer modelling with experiments. Secon ...

2002

Neutral beam stabilization of sawtooth oscillations in JET

Olivier Sauter, Antoine Pochelon

Recent experiments in the Joint European Torus (JET) have provided evidence of sawtooth stabilization by fast ions arising from deuterium neutral beam injection (NBI). A possible theoretical basis for the interpretation of the observed sawtooth period beha ...

2002

Improved low-energy electron injection systems for high rate electron capture dissociation in Fourier transform ion cyclotron resonance mass spectrometry

Yury Tsybin

New low-energy electron injection systems based on indirectly heated dispenser cathodes facilitate electron capture dissocn. (ECD) in Fourier transform ion cyclotron resonance (FTICR) mass spectrometry. In this joint report, details are presented of the de ...

2001

Experimental studies of electron transport

Giovanni Tardini

Electron transport in tokamaks has many different features which are briefly reviewed. The paper is focused on electron heat transport in conventional tokamak plasmas. An inter-machine comparison indicates that the non-dimensional gradient length of the el ...

2001

Characterization of impurities in L- and H-modes created by divertor biasing and plasma triangularity in TdeV

A characterization of the H-mode in Tokamak de Varennes (TdeV) is presented, combining results obtained from spectroscopic measurements with observations of global plasma parameters. Controlled L- and H-modes are obtained by applying an external bias on th ...

2001

Long-pulse improved central electron confinement in the TCV tokamak with electron cyclotron heating and current drive

Olivier Sauter, Stefano Coda, Timothy Goodman, Roland Behn

Current profile tailoring by electron cyclotron heating (ECH) and current drive (ECCD) is used to improve central electron energy confinement in the TCV tokamak. Counter-ECCD on axis alone achieves this goal in a transient manner only. A stable scenario is ...

2001

Applicability of the ballooning transform to trapped ion modes

Laurent Villard, Stephan Brunner, Matteo Maccio

In the scope of the study of low-frequency electrostatic microinstabilities in tokamak plasmas, attention has been focused on the effect of trapped ions. The ballooning transform has been applied to the gyrokinetic equation, for the case of a large aspect ...

2000

Study of the kink effect in AlInAs/GaInAs/InP composite channel HFETs

Marcel Py

A detailed study is presented on AlInAs/InGaAs/InP composite channels. These devices combine the advantages of high mobility at low voltages and high electric field operations thanks to the use of a composite channel formed by a thin InGaAs layer and a dop ...

Springer Verlag1999

Energy Confinement in Shaped TCV Plasmas with Electron Cyclotron Heating

Olivier Sauter, Stefano Coda, Timothy Goodman, Yves Martin, Jean-Marc Moret, Ivo Furno, Minh Quang Tran, Holger Reimerdes, Jean-Philippe Hogge, Henri Weisen, Jonathan Bryan Lister, Richard Pitts, Antoine Pochelon, Roland Behn

The effects of plasma shape on confinement and sawtooth stability are studied for positive and negative discharge triangularity and for different elongations with 1.5 MW centrally deposited ECH power ...

European Physical Society1999

Low-frequency noise properties of selectively dry etched InP HEMT's

Marcel Py

The low-frequency noise of lattice-matched InAlAs/InGaAs/InP high electron mobility transistors (HEMT's) gate recess etched with a highly selective dry etching process and with conventional wet etching were studied at different gate and drain biases for th ...

Institute of Electrical and Electronics Engineers1998

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