Alessandro Biancalani graduated in Physics at Scuola Normale Superiore in Pise, Italy, in 2005, then he entered a PhD program in Applied Physics at the University of Pise (supervisor: Prof. Francesco Pegoraro) in collaboration with ENEA-Frascati, Italy (co-supervisor: Prof. Fulvio Zonca) and University of California of Irvine, USA (co-supervisor: Prof. Liu Chen), defending his PhD thesis in 2010. He also got a Habilitation to Direct the Research (HDR) at the Sorbonne University in Paris, France, in 2019. Before joining the ESILV, he has worked at the Max-Planck Institute for Plasma Physics in Garching, Germany in collaboration with the Max-Planck Institute for Solar System Research. His main research interests include the theoretical investigation of waves, instabilities, and turbulence in plasmas, in particular in magnetic-confinement fusion experiments. For more infos, please see the personal page: www.biancalani.org.
alessandro.biancalani@devinci.fr
Özgür Gürcan; Johan Anderson; Sara Moradi; Alessandro Biancalani; Pierre Morel
Phase and amplitude evolution in the network of triadic interactions of the Hasegawa-Wakatani system Article de journal
Dans: Physics Of Plasmas, vol. 29, no. 5, p. 052306, 2022.
@article{gurcan_1825,
title = {Phase and amplitude evolution in the network of triadic interactions of the Hasegawa-Wakatani system},
author = {Özgür Gürcan and Johan Anderson and Sara Moradi and Alessandro Biancalani and Pierre Morel},
url = {https://aip.scitation.org/doi/10.1063/5.0089073},
year = {2022},
date = {2022-01-01},
journal = {Physics Of Plasmas},
volume = {29},
number = {5},
pages = {052306},
abstract = {The Hasegawa-Wakatani system, commonly used as a toy model of dissipative drift waves in fusion devices, is revisited with considerations
of phase and amplitude dynamics of its triadic interactions. It is observed that a single resonant triad can saturate via three way phase
locking, where the phase differences between dominant modes converge to constant values as individual phases increase in time. This allows
the system to have approximately constant amplitude solutions. Non-resonant triads show similar behavior only when one of its legs is a
zonal wave number. However, when an additional triad, which is a reflection of the original one with respect to the y axis is included, the
behavior of the resulting triad pair is shown to be more complex. In particular, it is found that triads involving small radial wave numbers
(large scale zonal flows) end up transferring their energy to the subdominant mode which keeps growing exponentially, while those involving
larger radial wave numbers (small scale zonal flows) tend to find steady chaotic or limit cycle states (or decay to zero). In order to study the
dynamics in a connected network of triads, a network formulation is considered, including a pump mode, and a number of zonal and non-
zonal subdominant modes as a dynamical system. It was observed that the zonal modes become clearly dominant only when a large number
of triads are connected. When the zonal flow becomes dominant as a ?collective mean field,? individual interactions between modes become
less important, which is consistent with the inhomogeneous wave-kinetic picture. Finally, the results of direct numerical simulation are dis-
cussed for the same parameters, and various forms of the order parameter are computed. It is observed that nonlinear phase dynamics results
in a flattening of the large scale phase velocity as a function of scale in direct numerical simulations.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Gregorio Vlad; Xin Wang; Francesco Vannini; Sergio Briguglio; Nakia Carlevaro; Matteo Valerio Falessi; Giuliana Fogaccia; Valeria Fusco; Fulvio Zonca; Alessandro Biancalani; Alberto Bottino; Thomas Hayward-Schneider; Philipp Walter Lauber
A linear benchmark between HYMAGYC, MEGA and ORB5 codes using the NLED-AUG test case to study Alfvénic modes driven by energetic particles Article de journal
Dans: Nuclear Fusion, vol. 61, no. 1, p. 116026, 2021.
@article{vlad_1713,
title = {A linear benchmark between HYMAGYC, MEGA and ORB5 codes using the NLED-AUG test case to study Alfvénic modes driven by energetic particles},
author = {Gregorio Vlad and Xin Wang and Francesco Vannini and Sergio Briguglio and Nakia Carlevaro and Matteo Valerio Falessi and Giuliana Fogaccia and Valeria Fusco and Fulvio Zonca and Alessandro Biancalani and Alberto Bottino and Thomas Hayward-Schneider and Philipp Walter Lauber},
url = {https://doi.org/10.1088/1741-4326/ac2522},
year = {2021},
date = {2021-11-01},
journal = {Nuclear Fusion},
volume = {61},
number = {1},
pages = {116026},
abstract = {One of the major challenges in magnetic confinement thermonuclear fusion research concerns
the confinement of the energetic particles (EPs) produced by fusion reactions and/or by
additional heating systems. In such experiments, EPs can resonantly interact with the shear
Alfvén waves. In the frame of the EUROfusion 2019-2020 Enabling Research project
?multi-scale energetic particle transport in fusion devices' (MET), a detailed benchmark
activity has been undertaken among few of the state-of-the-art codes available to study the
self-consistent interaction of an EP population with the shear Alfvén waves. In this paper
linear studies of EP driven modes with toroidal mode number n = 1 will be presented, in real
magnetic equilibria and in regimes of interest for the forthcoming generation devices (e.g.
ITER, JT-60SA, DTT). The codes considered are HYMAGYC, MEGA, and ORB5, the first
two being hybrid MHD-gyrokinetic codes (bulk plasma is represented by MHD equations,
while the EP species is treated using the gyrokinetic formalism), the third being a global
electromagnetic gyrokinetic code. The so-called NLED-AUG reference case has been
considered, both for the peaked on-axis and peaked off-axis EP density profile cases, using its
shaped cross section version. Comparison of the spatial mode structure, growth rate and real
frequency of the modes observed will be considered in detail. The dependence of mode
characteristics when several parameters are varied, as, e.g. the ratio between EP and bulk ion
density and EP temperature, will be presented. A remarkable agreement is observed among the
three codes for the peaked off-axis case, obtaining all of them a TAE localized close to the
magnetic axis. On the other hand, some differences are observed when considering the peaked
on-axis case, where two modes are observed (a TAE localized in the radial external region, and
an RSAE around mid-radius). A careful analysis of the stability of this equilibrium, in
particular by varying self-consistently the EP drive, will allow to reconcile the results of the
three codes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Alessandro Biancalani; Alberto Bottino; Matteo Valerio Falessi; Thomas Hayward Schneider; Philipp Lauber; Alexey Mishchenko; Francesco Vannini; Laurent Villard; Fulvio Zonca
Interaction of Alfvénic modes and turbulence via the nonlinear modification of the equilibrium profiles Inproceedings
Dans: Interaction of Alfvénic modes and turbulence via the nonlinear modification of the equilibrium profiles, online, 2022, ISBN: 979-10-96389-16-2.
@inproceedings{biancalani_2217,
title = {Interaction of Alfvénic modes and turbulence via the nonlinear modification of the equilibrium profiles},
author = {Alessandro Biancalani and Alberto Bottino and Matteo Valerio Falessi and Thomas Hayward Schneider and Philipp Lauber and Alexey Mishchenko and Francesco Vannini and Laurent Villard and Fulvio Zonca},
url = {http://ocs.ciemat.es/EPS2022PAP/html/author.html},
issn = {979-10-96389-16-2},
year = {2022},
date = {2022-07-01},
booktitle = {Interaction of Alfvénic modes and turbulence via the nonlinear modification of the equilibrium profiles},
address = {online},
abstract = {A key step towards the achievement of controlled nuclear fusion in magnetic confinement
devices is the mitigation of turbulence. Turbulent tokamak plasmas are intrinsically multiscale
systems. Microturbulence generates meso-scale zonal flows. Additionally, energetic particles
drive Alfvénic modes (AM) unstable, on meso- or macro-scales, and zonal structures.
In this work, we investigate the possible interaction of AMs and turbulence via the evolution
of the equilibrium profiles. Turbulence is known to strongly depend on the gradients of the
equilibrium profiles, for example plasma density and temperature. AMs can nonlinearly modify
the equilibrium profiles [1, 2, 3], and therefore affect turbulence. Viceversa, with the same
mechanism, turbulence can affect the AM dynamics.
We present results obtained by means of global gyrokinetic simulations with the particle-in-
cell code ORB5 [4]. In recent simulations with ORB5, AMs have been shown to carry substan-
tial heat and particle fluxes [5, 6]. Here, we extend that analysis by showing how the profile
modification due to those fluxes can affect turbulence.
References
[1] L. Chen and F. Zonca, Rev. Mod. Phys. 88, 015008 (2016)
[2] M. V. Falessi and F. Zonca, Phys. Plasmas 26, 022305 (2019)
[3] F. Zonca, L. Chen, M. V. Falessi and Z. Qiu, J. Phys. Conf. Ser. 1785, 012005 (2021)
[4] E. Lanti, et al, Comp. Phys. Commun. 251, 107072 (2020)
[5] A. Biancalani, A. Bottino, P. Lauber, A. Mishchenko and F. Vannini, J. Plasma Phys. 86, 825860301A (2020)
[6] A. Biancalani, et al, Plasma Phys. Control. Fusion 63, 065009 (2021)},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
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