Fluctuations of edge quantities in fusion and non-fusion plasmas are intermittent, meaning that frequent large bursts are observed, explained in terms of coherent convective structures originated...
On the statistics of edge fluctuations: comparative study between various fusion devices (2009)
Sattin, F., Agostini, M., Scarin, P., Vianello, N., Cavazzana, R., Marrelli, L., ...
In this paper we present a statistical study of edge fluctuations taken with the Gas Puffing Imaging (GPI) diagnostics. We carry out a comparison of GPI signal from an extensive database including...
Sattin, F., Agostini, M., Cavazzana, R., Serianni, G., Scarin, P., Vianello, N.
In this work we investigate the origin of the parabolic relation between skewness and kurtosis often encountered in the analysis of experimental time-series. We argue that the numerical values of the...
Overview of RF-mod results (2009)
Martin, P., Apolloni, L., Puiatti, M. E., Adamek, J., Agostini, M., Alfier, A., ...
High current regimes in RFX-mod (2008)
Valisa, M., Bolzonella, T., Buratti, P., Carraro, L., Cavazzana, R., Dal Bello, S., ...
Fick's law and Fokker-Planck Equation in inhomogeneous environments (2007)
In inhomogeneous environments, the correct expression of the diffusive flux is often not given by the Fick's law $\Gamma = - D \nabla n $. The most general hydrodynamic equation modelling diffusion...
When can Fokker-Planck Equation describe anomalous or chaotic transport? (2007)
The Fokker-Planck Equation, applied to transport processes in fusion plasmas, can model several anomalous features, including uphill transport, scaling of confinement time with system size, and...
Statistical features of edge turbulence in RFX-mod from Gas Puffing Imaging (2006)
Sattin, F., Scarin, P., Agostini, M., Cavazzana, R., Serianni, G., Spolaore, M., ...
Plasma density fluctuations in the edge plasma of the RFX-mod device are measured through the Gas Puffing Imaging Diagnostics. Statistical features of the signal are quantified in terms of the...
Statistical model for intermittent plasma edge turbulence (2005)
The Probability Distribution Function of plasma density fluctuations at the edge of fusion devices is known to be skewed and strongly non-Gaussian. The causes of this peculiar behaviour are, up to...
Signatures of non-Markovian turbulent transport in Reversed Field Pinch plasmas (2005)
Sattin, F., Paccagnella, R., D'Angelo, F.
Transport of field lines is studied for a realistic model of magnetic field configuration in a Reversed Field Pinch. It is shown that transport is anomalous, i.e., it cannot be described within the...
On the Probability distribution function of particle density at the edge of fusion devices (2004)
Sattin, F., Vianello, N., Valisa, M.
The Probability Distribution Function (PDF) Pn(n) of the particle density at the edge of several magnetic fusion devices, including tokamaks, stellarators, and linear devices, is known to be strongly...
Zanca, P., Sattin, F., Martines, E.
The equilibrium of a finite-beta cylindrical RFP plasma in the presence of saturated-amplitude tearing modes is investigated. The singularities arising from the perturbative analysis of the MHD force...
Superstatistics from a different perspective (2003)
In this paper we elaborate on the recently proposed superstatistics formalism [C. Beck and E.G.D. Cohen, Physica A 322, 267 (2003)], used to interpret unconventional statistics. Their interpretation...
In this work we review the classical recipe for estimating partial cross sections for electron capture into selected energy levels within the Classical Trajectory Monte Carlo (CTMC) method [R.L....
Effect of ICRH on impurity transport in improved H-mode discharges in ASDEX Upgrade (2003)
Zaniol,B., Maggi,C. F., Carraro,L., Dux,R., Horton,L. D., Nishijima,D., ...
Effect of ICRH on impurity transport in improved H-mode discharges in ASDEX Upgrade (2003)
Zaniol, B., Maggi, C. F., Carraro, L., Dux, R., Horton, L. D., Nishijima, D., ...
Overview of JET results (2003)
Pamela, J., Solano, E. R., Adams, J. M., Agarici, G., Agarici, M., Akhter, H., ...
Scientific and technical activities on JET focus on the issues likely to affect the ITER design and operation. Our understanding of the ITER reference mode of operation, the ELMy H-mode, has...
On the measurement of poloidal rotation of ions in JET ITB plasmas (2003)
Crombé, Kristel, ANDREW, Y, GIROUD, C, HAWKES, N, SATTIN, F, VALISA, M, ...
Electron Impact Ionization Close to the Threshold: Classical Calculations (2002)
In this paper we present Classical Trajectory Monte Carlo (CTMC) calculations for single and multiple electron ionization of Argon atoms and ions in the threshold region. We are able to recover the...
Tsallis' non-extensive statistical mechanics is claimed to be the correct tool to describe the behaviour of low-dimensional dissipative maps at the edge of chaos. Indeed, many different approaches...
Non-Gaussian PDFs from Maximum-Entropy-principle considerations (2002)
In this work we develop on the recently suggested concept of superstatistics [C. Beck and E.G.D. Cohen, Physica A {\bf 322}, 267 (2003)], face the problem of devising a viable way for estimating the...
Non-extensive entropy from incomplete knowledge of Shannon entropy? (2002)
In this paper we give an interpretation of Tsallis' nonextensive statistical mechanics based upon the information-theoretic point of view of Luzzi et al. [cond-mat/0306217; cond-mat/0306247;...
Derivation of Tsallis statistics from dynamical equations for a granular gas (2002)
In this work we present the explicit calculation of Probability Distribution Function for a model system of granular gas within the framework of Tsallis Non-Extensive Statistical Mechanics, using the...
Hawkes,N. C., Andrew,Y., Challis,C. D., DeAngelis,R., Drozdov,V., Hobirk,J., ...
In JET discharges where lower hybrid heating and current drive (LHCD) is applied early during the current ramp, a region of the plasma with zero current density is formed near the axis. At the...
An equilibrium model for RFP plasmas in the presence of resonant tearing modes (2002)
The equilibrium of a finite-beta RFP plasma in the presence of saturated-amplitude tearing modes is investigated. The singularities of the MHD force balance equation JXB=grad(p) at the modes rational...
Hawkes, N. C., Andrew, Y., Challis, C. D., DeAngelis, R., Drozdov, V., Hobirk, J., ...
In JET discharges where lower hybrid heating and current drive (LHCD) is applied early during the current ramp, a region of the plasma with zero current density is formed near the axis. At the...
Hawkes, N., Andrew, Y., Challis, C., DeAngelis, R., Drozdov, V., Hobirk, J., ...
Plasma Physics and Controlled Fusion Vol.44 Nr.7, 1105 - 1125
Further study of the Over-Barrier Model to compute charge exchange processes (2001)
In this paper we study theoretically the process of electron capture between one-optical-electron atoms (e.g. hydrogenlike or alkali atoms) and ions at low-to-medium impact velocities ($v/v_e \approx...
Semi-classical Over Barrier Model for low-velocity ion-atom charge exchange processes (2001)
We develop an Over Barrier Model for computing charge exchange between ions and one-active-electron atoms at low impact energies. The main feature of the model is the treatment of the barrier...
In this paper we study theoretically the process of electron capture between one-optical-electron atoms (e.g. hydrogenlike or alkali atoms) and ions at low-to-medium impact velocities (v/v_e
Absolute total cross sections for electron capture between slow, highly charged ions and alkali targets have been recently measured. It is found that these cross sections follow a scaling law with...
Chaos in coplanar classical collisions with particles interacting through $1/r^2$ forces (1998)
The scattering among three particles interacting through $1/r^2$ forces, with opposite charges and widely different masses, is studied in a coplanar geometry. The present work shows that at low...
Search for low-dimensional chaos in a reversed field pinch plasma (1998)
An analysis of experimental data from the RFX (Reversed Field eXperiment) reversed field pinch machine [L. Fellin, P. Kusstatscher and G. Rostagni, Fusion Eng. Des. {\bf 25}, 315 (1995)] is carried...
Charge Exchange Processes between Excited Helium and Fully Stripped Ions (1994)
We made a classical trajectory Monte Carlo (CTMC) calculation of state selective cross sections for processes between some light ions and excited helium. The results, useful for analysis of...
Charge Exchange Processes between Excited Helium and Fully Stripped Ions (1994)
We made a classical trajectory Monte Carlo (CTMC) calculation of state selective cross sections for processes between some light ions and excited helium. The results, useful for analysis of...