Publications de Alessandro Bortolon

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The first toroidal rotation measurements in TCV ohmic L-mode plasmas with no external momentum injection are presented. The toroidal velocity profile of the fully stripped carbon species is measured by active Charge eXchange Recombination Spectroscopy with ...

On the Tokamak a Configuration Variable (TCV), electron internal transport barriers (eITBs) can be formed during a gradual evolution from a centrally peaked to a hollow current profile while all external actuators are held constant. The formation occurs ra ...

In the moderate magneticfield of TCV (1.5T), the recently installed X3 system (3 gyrotrons @118 GHz, 0.45 MW/each, 2s) broadens the operational space with the possibility of heating plasmas at high density, well above the cutoff density of the X2 system (X ...

The impact of plasma shaping on electron heat transport is investigated in TCV L-mode plasmas. The study is motivated by the observation of an increase in the energy confinement time with decreasing plasma triangularity which may not be explained by a chan ...

Bulk plasma toroidal rotation is observed to invert spontaneously from counter to cocurrent direction in TCV (Tokamak à Configuration Variable) Ohmically heated discharges, in low confinement mode, without momentum input. The inversion occurs in high curre ...

Toroidal momentum transport mechanisms are reviewed and put in a broader perspective. The generation of a finite momentum flux is closely related to the breaking of symmetry (parity) along the field. The symmetry argument allows for the systematic identifi ...

Intense electron cyclotron resonance heating (ECRH) and electron cyclotron current drive (ECCD) are employed on the Tokamak a Configuration Variable (TCV) both in second- and third-harmonic X-mode (X2 and X3). The plasma behaviour under such conditions is ...

A new mechanism has recently been proposed that generates a radial flux of parallel momentum in toroidal plasmas. Namely, by considering up-down asymmetric flux surfaces, the symmetry following the magnetic field can be broken and an additional contributio ...

Direction reversals of intrinsic toroidal rotation have been observed in Alcator C-Mod ohmic L-mode plasmas following modest electron density or toroidal magnetic field ramps. The reversal process occurs in the plasma interior, inside of the q = 3/2 surfac ...

The first experimental evidence of parallel momentum transport generated by the up-down asymmetry of a toroidal plasma is reported. The experiments, conducted in the Tokamak a` Configuration Variable, were motivated by the recent theoretical discovery of i ...

The diagnostic neutral beam injector (DNBI) together with a charge exchange recombination spectroscopy (CXRS) system has been used on the TCV Tokamak as a diagnostic tool for local measurements of plasma ion temperature, velocity and carbon impurity densit ...

Alessandro Bortolon

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Toroidal plasma rotation in the TCV tokamak

Safety factor profile requirements for electron ITB formation in TCV

Third-harmonic X-mode, real-time controlled top-launch ECW experiments on TCV tokamak

Impact of plasma triangularity and collisionality on electron heat transport in TCV L-mode plasmas

Observation of Spontaneous Toroidal Rotation Inversion in Ohmically Heated Tokamak Plasmas

Overview of toroidal momentum transport

Plasma dynamics with second and third-harmonic ECRH and access to quasi-stationary ELM-free H-mode on TCV

Experimental demonstration of an up-down asymmetry effect on intrinsic rotation in the TCV tokamak

Observations of core toroidal rotation reversals in Alcator C-Mod ohmic L-mode plasmas

Experimental Evidence of Momentum Transport Induced by an Up-Down Asymmetric Magnetic Equilibrium in Toroidal Plasmas

The diagnostic neutral beam injector with arc-discharge plasma source on the TCV Tokamak

Impact of Plasma Shaping on Electron Heat Transport in TCV L-mode Plasmas at Various Collisionalities

Bulk Plasma Rotation in the TCV Tokamak in the Absence of External Momentum Input

Comparison of MHD-mode and Plasma Rotation Frequencies in TCV Ohmic and ECH Discharges

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

Particle and Impurity Transport in Electron-Heated Discharges in TCV

Plasma Dynamics with Second and Third Harmonic ECRH on TCV Tokamak

Momentum transport and plasma rotation spin up in TCV

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

Carbon transport in TCV