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Publications associées (37)

Spectral phase conjugation with cross-phase modulation compensation

Spectral phase conjugation with short pump pulses in a third-order nonlinear material is analyzed in depth. It is shown that if signal amplification is considered, the conversion efficiency can be significantly higher than previously considered, while the ...

2004

Modelling of the electron cyclotron current drive experiments in the TCV tokamak

Olivier Sauter, Stefano Coda, Timothy Goodman, Roland Behn, Petri Nikkola

With the very high electron cyclotron (EC) wave power density achieved in the TCV tokamak, more than 20 MW m(-3), quasilinear modelling predicts an electron cyclotron current drive (ECCD) efficiency well in excess to the experimental value, by up to a fact ...

2003

Development of a 140-GHz 1-MW continuous wave gyrotron for the W7-X stellarator

Stefano Alberti, Minh Quang Tran, Jean-Philippe Hogge

The development of high-power gyrotrons (118 GHz, 140 GHz) in continuous-wave (CW) operation for heating nuclear fusion plasmas has been in progress for several years in a joint collaboration between different European research institutes and industrial pa ...

2002

Development of a 140 GHz, 1 MW, continuous wave gyrotron for the W7-X stellarator

Stefano Alberti, Minh Quang Tran, Jean-Philippe Hogge

The development of high power gyrotrons in continuous wave (CW) operation for heating of plasmas used in nuclear fusion research has been in progress for several years in a joint collaboration between different European research institutes and industrial p ...

2001

The 118 GHz ECRH experiment on Tore Supra

Stefano Alberti, Minh Quang Tran

An electron cyclotron resonance heating (ECRH) system is presently under construction at Commissariat A l'Energie Atomique (CEA) Cadarache for the Tore Supra experiment. The generator is planned to be made of six gyrotrons giving RF waves with a frequency ...

2001

Demonstration of microwave generation by a ferroelectric-cathode tube

Catherine Pralong

A ferroelectric cathode is employed in a cyclotron-resonance maser (CRM). The CRM oscillator device operates at similar to 7 GHz, near the cutoff frequency of a hollow cylindrical cavity. The cathode is made of a PLZT 12/65/35 ceramic with high-dielectric ...

1999

Electron beam instabilities in gyrotron beam tunnels

Stefano Alberti, Minh Quang Tran, Jean-Philippe Hogge, Trach-Minh Tran

Electron beam instabilities occurring in a gyrotron electron beam can induce an energy spread which might significantly deteriorate the gyrotron efficiency. Three types of instabilities are considered to explain the important discrepancy found between the ...

1998

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