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Magnetic Fields Topology in Tokamaks

Grant number: 10/13162-0
Support type:Scholarships in Brazil - Doctorate
Effective date (Start): November 01, 2010
Effective date (End): December 31, 2013
Field of knowledge:Physical Sciences and Mathematics - Physics - Physics of Fluids, Plasma Physics and Electrical Discharge
Principal researcher:Marisa Roberto
Grantee:Caroline Gameiro Lopes Martins
Home Institution: Divisão de Ciências Fundamentais (IEF). Instituto Tecnológico de Aeronáutica (ITA). Ministério da Defesa (Brasil). São José dos Campos , SP, Brazil


In the Plan of Action 2007 - 2010 MCT is expected to invest in future technologies within the Brazilian Nuclear Program, in particular nuclear fusion. To implement this action, the Ministry created the National Network of Fusion - RNF, with funding initially provided through the project of order of FINEP, which is in final stage of implementation. The agreement Brazil - EURATOM was established by the MRE, allowing an exchange between Brazilian researchers in laboratories in Europe and also the coming of European researchers to participate in experimental projetcs in tokamaks TCABR and ETE, located in Brazil. With the demonstration of scientific feasibility of nuclear fusion in the 1990s, were strongly intensified activities to develop fusion reactors. This effort resulted in the approval of construction in France, the first prototype of a reactor, ITER, a consortium formed by six countries and the European Community. There were several calls for Brazil to be part of the ITER Project, with two delegations of experts from the European Community visiting the country, to evaluate this possibility. These discussions were conducted by CNEN, with participation of representatives of the Brazilian groups that work in this area. It was decided that to effectively participate in the ITER project, would be needed before better coordinate, expand and consolidate the activities undertaken by these groups, through a network of research, RNF, under the coordination of CNEN, establish an official agreement of collaboration with the EURATOM and plan the installation of a National Laboratory of Fusion, LNF, from 2010. The network was established and is effectively in operation, and an agreement with the European Community has been driven by the MRE and the LNF project is being prepared. Given the need to focus on the activities undertaken by the network for problems relevant to ITER and future fusion reactors, the Scientific Technical Council of RNF decided to prioritize the following themes: i) confinement in tokamaks, ii) diagnostic systems for reactors fusion, iii) materials for fusion reactors, iv) control, data acquisition and processing; v) theoretical and computational modeling. The Ph.D. project proposed here comes within the context of theoretical computational modeling through the code CRONOS, for tokamaks TCABR, located at the Institute of Physics, University of São Paulo and for ITER to be built at Cadarache in France. The advisor of this project, Prof. Marisa Roberto was in France during the period April-May 2010, conducting a training in Cadarache, in order to obtain a license to use the code CRONOS, as well as for obtaining the software. The modeling is to study the time evolution of the MHD equilibrium, assuming a generic cross section with triangularity and elongation. It will also investigate the transport of particles in the whole region of unloading, also using the CRONOS. External perturbations should be included, such as those produced by an ergodic magnetic limiter in order to create resonant modes in the peripheral region of the plasma column. Thus, we compare the transport of particulates in the discharges with resonant perturbation and without it. Build a Hamiltonian system for the study of the behavior of magnetic field lines, following methods similar to those of other studies published by the advisor and the co-advisor of this project. With the result of transportation provided by CRONOS we will relate the transport of particles toward the wall of the tokamak with the escape of the magnetic field lines, with and without resonant perturbation.

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Scientific publications
(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)
MARTINS, CAROLINE G. L.; ROBERTO, M.; CALDAS, I. L.. Delineating the magnetic field line escape pattern and stickiness in a poloidally diverted tokamak. Physics of Plasmas, v. 21, n. 8, . (13/03401-6, 10/13162-0)
MARTINS, CAROLINE G. L.; ROBERTO, MARISA; CALDAS, IBERE L.. Magnetic Field Line Stickiness in Tokamaks. IEEE TRANSACTIONS ON PLASMA SCIENCE, v. 42, n. 10, 1, SI, p. 2764-2765, . (13/03401-6, 10/13162-0)

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