C. Galperti
ENEA
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Publication
Featured researches published by C. Galperti.
Nuclear Fusion | 2015
G. Spizzo; G. Pucella; O. Tudisco; M. Zuin; M. Agostini; E. Alessi; F. Auriemma; W. Bin; P. Buratti; L. Carraro; R. Cavazzana; G. Ciaccio; G. De Masi; B. Esposito; C. Galperti; S. Garavaglia; G. Granucci; M. Marinucci; L. Marrelli; E. Martines; C. Mazzotta; D. Minelli; A. Moro; M. E. Puiatti; P. Scarin; C. Sozzi; M. Spolaore; O. Schmitz; N. Vianello; R. B. White
The ITER scenarios and the project of DEMO involve stable operation above the Greenwald density, which justifies efforts to understand and overcome the density limit, this last observed as a disruptive termination of tokamak discharges and a thermal crash (with no disruption) of stellarator and reversed-field pinch (RFP) ones. Both in the tokamak and the RFP, new findings show that the high density limit is not governed by a unique, theoretically well-determined physical phenomenon, but by a combination of complex mechanisms involving two-fluid effects, electrostatic plasma response to magnetic islands and plasma-wall interaction. In this paper we will show new evidence challenging the traditional picture of the Greenwald limit, in particular with reference to the role of thermal instabilities and the edge radial electric field Er in the development of this limit.
Plasma Physics and Controlled Fusion | 2014
C. Galperti; C. Marchetto; E. Alessi; D. Minelli; M. Mosconi; F. Belli; L. Boncagni; A. Botrugno; P. Buratti; G. Calabrò; B. Esposito; S. Garavaglia; G. Granucci; A. Grosso; V. Mellera; A. Moro; V. Piergotti; G. Pucella; G. Ramogida; W. Bin; C. Sozzi
The biorthogonal decomposition analysis of signals from an array of Mirnov coils is able to provide the spatial structure and the temporal evolution of magnetohydrodynamic (MHD) instabilities in a tokamak. Such analysis can be adapted to a data acquisition and elaboration system suitable for fast real time applications such as instability detection and disruption precursory markers computation. This paper deals with the description of this technique as applied to the Frascati Tokamak Upgrade (FTU).
Nuclear Fusion | 2015
C. Sozzi; C. Galperti; E. Alessi; S. Nowak; G. Apruzzese; F. Belli; W. Bin; L. Boncagni; A. Botrugno; A. Bruschi; P. Buratti; G. Calabrò; B. Esposito; L. Figini; S. Garavaglia; G. Granucci; L.A. Grosso; C. Marchetto; M. Marinucci; Davide Marocco; C. Mazzotta; V. Mellera; D. Minelli; M. Mosconi; A. Moro; V. Piergotti; G. Pucella; G. Ramogida; A. Romano; O. Tudisco
Experiments on real time control of magneto-hydrodynamic (MHD) instabilities using injection of electron cyclotron waves (ECW) are being performed with a control system based on only three real time key items: an equilibrium estimator based on a statistical regression, a MHD instability marker (SVDH) using a three-dimensional array of pick-up coils and a fast ECW launcher able to poloidally steer the EC absorption volume with dρ/dt = 0.1/30 ms maximum radial speed. The MHD instability, usually a tearing mode with poloidal mode number m and toroidal mode number n such that m/n = 2/1 or 3/2 is deliberately induced either by neon gas injection or by a density ramp hitting the density limit. No diagnostics providing the radial localization of the instabilities have been used. The sensitivity of the used MHD marker allows to close the control loop solely on the effect of the actuators action with little elaboration. The nature of the instability triggering mechanism in these plasma prevents that the stabilization lasts longer than the ECW pulse. However when the ECW power is switched on, the instability amplitude shows a marked sensitivity to the position of the absorption volume with an increase or decrease of its growth rate. Moreover the suppression of the dominant mode by ECRH performed at high plasma density even at relatively low power level facilitates the development of a secondary mode. This minimized set of control tools aim to explore some of the difficulties which can be expected in a fusion reactor where reduced diagnostic capabilities and reduced actuator flexibility can be expected.
Nuclear Fusion | 2017
H. Anand; C. Galperti; S. Coda; B.P. Duval; Faa Federico Felici; T. C. Blanken; E. Maljaars; J.-M. Moret; O. Sauter; T.P. Goodman; Doo-Hyun Kim
Theory and Simulation of Disruptions Workshop (TSDW 2016) | 2016
G. Papp; G. Pautasso; J. Decker; M. Gobbin; P. J. McCarthy; P. Blanchard; Daniele Carnevale; D. Choi; S. Coda; B.P. Duval; R. Dux; B. Erdös; B. Esposito; O. Ficker; R. Fischer; C. Fuchs; C. Galperti; L. Giannone; A. Gude; B. Labit; K. Lackner; T. Lunt; L. Marelli; P. Martin; A. Mlynek; M. Maraschek; Philippe Marmillod; M. Nocente; Y. Peysson; P. Piovesan
25th Fusion Energy Conference (FEC 2014), Saint Petersburg, Russia, 13 - 18 October 2014 | 2014
S. Nowak; P. Buratti; O. Sauter; E. Lazzaro; G. Pucella; D. Testa; W. Bin; G. P. Canal; B.P. Duval; L. Federspiel; C. Galperti; S. Garavaglia; G. Granucci; Doo-Hyun Kim; A. Moro; H. Reimerdes; Jx Rossel; C. Sozzi; A. A. Tuccillo; O. Tudisco; D. Wagner; Ftu; Tcv Teams
Bulletin of the American Physical Society | 2017
T. C. Blanken; Federico Felici; C. Galperti
44th EPS Conference on Plasma Physics | 2017
Daniele Carnevale; G. Ferro; B. Esposito; M. Gobbin; C. Galperti; J. Decker; M. Gospodarczyk; S. Coda; B.P. Duval; A. R. Sheikh; G. Papp; P. Buratti; F. Causa; Sergio Galeani; F. Martinelli; V. Plyusnin; C. Possieri; Mario Sassano; Tcv Team; EUROfusion Mst Team
44th EPS Conference on Plasma Physics | 2017
M. Maraschek; M. Bernert; S. Fietz; L. Giannone; A. Gude; V. Igochine; G. Pautasso; S. Potzel; C. Rapson; M. Reich; J. Stober; H. Zohm; S. Coda; B.P. Duval; M. Fontana; C. Galperti; T.P. Goodman; L. Porte; O. Sauter; E. Alessi; C. Cianfarani; B. Esposito; G. Granucci; S. Nowak; C. Sozzi; L. Marrelli; R. Paccagnella; P. Piovesan; G. Spizzo; P. Zanca
44th EPS Conference on Plasma Physics | 2017
M. Kong; O. Sauter; T. C. Blanken; F. Felici; C. Galperti; T.P. Goodman; G. M. D. Hogeweij; Doo-Hyun Kim; S. H. Kim; E. Maljaars; B. Mavkov; M. Reich; T. Vu; Tcv Team