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Fusion plasma applications and modeling of low temperature plasmas


Transport barriers in magnetic field lines have a significant role in fusion tokamak area. Through devices that cause external perturbations, which may be an ergodic limiter, which cause perturbation in surfaces at the edge of the plasma column, the formation of a stochastic layer is possible. We intend to take a methodology described in previous works to include the effects of the plasma response in the presence of resonant magnetic perturbations. It is proposed to study tokamaks with poloidal divertors in any cross section, including triangularity and elongation, using the method of maps to study the effects of magnetic field line transport in the tokamak edges.It is also proposed to study the turbulence caused by drift waves in plasmas fusion. The numerical model will simulate the drift waves, which arise due to non-uniformity of plasma electric field. The non-uniformity is generates by floating electrostatic potential taht causes the anomalous transport of particles observed in the tokamak edge. With the demonstration of scientific feasibility of controlled nuclear fusion in the early 1990s activities to develop fusion reactors were strongly intensified. This effort resulted in construction in France, of the first prototype of a reactor, ITER, by a consortium of six countries and the European Community. The project proposed here is within the context of computational theoretical modeling through Cronos code for TCABR tokamaks, located in the Institute of Physics of the University of Sao Paulo and ITER, under construction in Cadarache, France. The proponent of this project, Prof. Marisa Roberto and Dr. Wanderley Pires de Sá were in Cadarache in 2010, conducting training to obtaining a license to use the Cronos, returning in 2012 for a second training. The model consists to study transport particles throughout the discharge region and the study of anomalous transport at the edge, which is much higher than expected with the use of collisional classical theory, which is the cause of the turbulent plasma in this region. It also intends to investigate the MHD equilibrium and transport using a toroidal current profile with magnetic shear through Cronos.As regards the area of cold plasmas for technological applications, there is progress achieved in recent years in the electronics industry, as it relates to microelectronic devices and electromechanical microsystems (MEMS). We intend to use reactors such as "reactive ion etching" (RIE) and "inductively coupled plasma" ICP in which cold plasmas are generated by discharges in gases at low pressure to perform corrosion. For this, a radio frequency discharge will be studied at different pressure values, power and gas flow. Computational models will be developed or improved to better clarify the main key mechanisms governing the physics and chemistry of plasmas generated for these reactors. Two methods will be used Particle-in-Cell plus Monte Carlo Collision and Global Model. (AU)

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Scientific publications (6)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
MARCUS, F. A.; ROBERTO, M.; CALDAS, I. L.; ROSALEM, K. C.; ELSKENS, Y. Influence of the radial electric field on the shearless transport barriers in tokamaks. Physics of Plasmas, v. 26, n. 2 FEB 2019. Web of Science Citations: 0.
TONELI, D. A.; PESSOA, R. S.; ROBERTO, M.; GUDMUNDSSON, J. T. A global model study of low pressure high density CF4 discharge. PLASMA SOURCES SCIENCE & TECHNOLOGY, v. 28, n. 2 FEB 2019. Web of Science Citations: 1.
FRAILE JUNIOR, ANDRE CARLOS; ROBERTO, MARISA; CALDAS, IBERE LUIZ. Plasma Response to Resonant Perturbations at Tokamak Edge. Brazilian Journal of Physics, v. 48, n. 4, p. 426-432, AUG 2018. Web of Science Citations: 0.
FRAILE, JR., ANDRE CARLOS; ROBERTO, MARISA; CALDAS, IBERE LUIZ; LOPES MARTINS, CAROLINE GAMEIRO. Plasma Response to Resonant Magnetic Perturbations in Large Aspect Ratio Tokamaks. IEEE TRANSACTIONS ON PLASMA SCIENCE, v. 45, n. 11, p. 2906-2912, NOV 2017. Web of Science Citations: 3.
ROBERSON, GERALDO; ROBERTO, MARISA; CALDAS, IBERE LUIZ; KROETZ, TIAGO; VIANA, RICARDO LUIZ. Shaping Diverted Plasmas With Symplectic Maps. IEEE TRANSACTIONS ON PLASMA SCIENCE, v. 45, n. 3, p. 356-363, MAR 2017. Web of Science Citations: 1.
ROSALEM, K. C.; ROBERTO, M.; CALDAS, I. L. Drift-wave transport in the velocity shear layer. Physics of Plasmas, v. 23, n. 7 JUL 2016. Web of Science Citations: 0.

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