Publications de Stefano Alberti

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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 of 118 GHz and a unit power of 400 kW (500 kW) for a pulse length of 210 s (5 s); two of them are already installed: the prototype was first tested on various dummy loads and on plasma and the first series tube is still being tested on a CW load. The resul

The magnetron injection gun (MIG) is one of the most critical subcomponents in gyrotrons. The electron beam, which has the primary role on the gyrotron operation, is generated and configured at this part of the tube. The electron beam properties determine ...

The aim of the WEST experiments is to master long plasma pulses (1000s) and expose ITER-like tungsten wall to deposited heat fluxes up to 10 MW/m2. To increase the margin to reach the H-Mode and to control W-impurities in the plasma, the installation of an ...

Recently developed self-consistent models for beam-wave interaction simulations of a gyrotron oscillator are used to study spurious backward-wave instabilities in smooth-wall metallic beam ducts. Starting from a simple case with a basic geometry, the influ ...

A mock-up gun has been manufactured as exact replica of the refurbishment first prototype EU 170 GHz/2MW/CW coaxial cavity gyrotron, but without emitter ring in order to validate the voltage standoff stability. The experimental results of the mock-up gun tests are presented.

We have performed this work again.

We demonstrate the construction of corrugated waveguides using stacked rings to propagate terahertz frequencies. The waveguide allows propagation of the same fundamental mode as an optical-fiber, namely, the H E11 mode. This simple concept opens the way fo ...

We demonstrate the construction of corrugated waveguides using stacked rings to propagate terahertz frequencies. The waveguide allows propagation of the same fundamental mode as an optical-fiber, namely, the HE11 mode. This simple concept opens the way for ...

Stefano Alberti

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The 118 GHz ECRH experiment on Tore Supra

Overview on recent progress in magnetron injection gun theory and design for high power gyrotrons

A new 3MW ECRH system at 105 GHz for WEST*

Linear and non-linear studies of spurious backward-wave instabilities in a smooth-wall gyrotron beam duct

Status of the EU 170 GHz/2 MW/CW Coaxial Cavity Gyrotron for ITER: The Dummy Gun Experiment

A new concept for the collection of an electron beam guided by an externally applied magnetic field

Mode Content Analysis of the RF output of a Gyrotron Based on the Astigmatic Gaussian Beams of High Order

Stacked rings for terahertz wave-guiding

Experimental results of the 1-MW, 140-GHz, CW gyrotron for W7-X

Quasi-Vertical Launch Third Harmonic Electron Cyclotron Resonance Heating of H-mode on TCV

ETG modelling of a TCV multi-phase H-mode shot

Numerical study of the effect of stray magnetic field on the beam quality of the 170 GHz, 2MW gyrotron gun for ITER

Note: Stacked rings for terahertz wave-guiding

Homogenous power distribution along gyrotron collector walls

Installation and commissionning of the EU test facility for ITER gyrotron

Recent physics results with electron cyclotron heating in TCV

Plasma Dynamics with Second and Third Harmonic ECRH on TCV Tokamak

Third harmonic EC heating of ELMy H-mode in TCV

Physics research on the TCV tokamak facility: from conventional to alternative scenarios and beyond

Vertical Launch Third Harmonic Electron Cyclotron Resonance Heating of H-mode on TCV and Access to Quasi-Stationary ELM-free H-mode