Abstract:and radial ion heat flux gammaTi are obtained. Their dependence on the squared Mach number alpha =
is analyzed (here Uzetai is the ion toroidal velocity and c s is the sound velocity, respectively). Some interesting peculiarities of this dependence are emphasized.]]>
“…The main result of this theory is that the neoclassical poloidal rotation of the main ion, V neo i,θ , is proportional to the ion temperature gradient. Subsequently, Mikhailovskii and Tsypin [58], using a kinetic approach, found a more precise value for k ν in the Pfirsch-Schlüter regime (k ν = −1.83), which has been confirmed by other works [59,60]. The main ion poloidal rotation, however, is expected to be different from that of impurity ions of different charge states.…”
An overview of intrinsic plasma rotation studies in Ohmic L-mode discharges carried out in the Tokamak Chauffage Alfvén Brésilien (TCABR) tokamak is presented. Measurements of plasma poloidal and toroidal rotation, and a comparison against neoclassical theory, are presented. The results show that poloidal rotation is in good agreement with neoclassical theory while toroidal rotation is found to be anomalous. A new technique that allows for high temporal resolution measurements of plasma rotation is presented. This technique is used to test two models of intrinsic toroidal rotation: the so-called Helander model (Helander et al 2003 Physics of Plasmas
10 4396) and Rozhansky model (Rozhansky 2013 Perpendicular currents and electric fields in fully and partially ionized magnetized plasma Physics of Plasmas
24 101614). As TCABR is a relatively small device, the influence of the neutrals that form the basis of this model is expected to be enhanced. The results indicate that the mechanism proposed by Helander does not contribute significantly to the intrinsic toroidal rotation in TCABR plasmas. The measurements, however, indicate that the frictional force proposed by Rozhansky might be responsible for part of the intrinsic toroidal rotation observed in TCABR plasmas.
“…The main result of this theory is that the neoclassical poloidal rotation of the main ion, V neo i,θ , is proportional to the ion temperature gradient. Subsequently, Mikhailovskii and Tsypin [58], using a kinetic approach, found a more precise value for k ν in the Pfirsch-Schlüter regime (k ν = −1.83), which has been confirmed by other works [59,60]. The main ion poloidal rotation, however, is expected to be different from that of impurity ions of different charge states.…”
An overview of intrinsic plasma rotation studies in Ohmic L-mode discharges carried out in the Tokamak Chauffage Alfvén Brésilien (TCABR) tokamak is presented. Measurements of plasma poloidal and toroidal rotation, and a comparison against neoclassical theory, are presented. The results show that poloidal rotation is in good agreement with neoclassical theory while toroidal rotation is found to be anomalous. A new technique that allows for high temporal resolution measurements of plasma rotation is presented. This technique is used to test two models of intrinsic toroidal rotation: the so-called Helander model (Helander et al 2003 Physics of Plasmas
10 4396) and Rozhansky model (Rozhansky 2013 Perpendicular currents and electric fields in fully and partially ionized magnetized plasma Physics of Plasmas
24 101614). As TCABR is a relatively small device, the influence of the neutrals that form the basis of this model is expected to be enhanced. The results indicate that the mechanism proposed by Helander does not contribute significantly to the intrinsic toroidal rotation in TCABR plasmas. The measurements, however, indicate that the frictional force proposed by Rozhansky might be responsible for part of the intrinsic toroidal rotation observed in TCABR plasmas.
“…Além disso, o grupo tem se dedicado com estudos sobre rotação da coluna de plasma via métodos espectroscópicos [31,32,33]. No que tange a fenômenos de transporte em plasmas, destacam-se os estudos do efeito de ondas de deriva no transporte de partículas no TCABR [34] e no TBR-1 [35], trabalhos em colaboração sobre modelos teóricos [36,37], transporte neoclássico na região de borda [38,39], transporte anômalo induzido por ondas de Alfvén [40,41], dentre outros. E por fim, quanto aos estudos sobre impurezas, podemos citar os trabalhos sobre efeito de assimetrias de impurezas pesadas na borda [42], espectroscopia de impurezas na região VUV [43].…”
Section: Contexto Do Estudo De Transporte De Impurezas No Tcabrunclassified
Dedico esse trabalho ao meu filho, Luís Felippe Tomazini Fernandes.iii Agradecimentos Ao longo desses anos todos de pós-graduação tenho recebido a ajuda e auxílio de inúmeras pessoas de forma que é inegável que o processo de fazer ciência se dá primariamente por relacionamentos humanos. Chegando até aqui, sinto-me compelido a lembrar daqueles que compartilharam comigo seus conhecimentos e experiências.Assim, gostaria de manifestar meu profundo agradecimento, respeito e apreço por meu orientador de doutorado, Prof. Helder José Facundo Severo. Nas incontáveis reuniões e conversas informais por ter me confiado o tema de pesquisa e compartilhado de um ambiente de pesquisa saudável e livre de interferências externas. Aqui também é salutar incluir em meus mais sinceros agradecimentos ao Prof. Ricardo Magnus Osório Galvão cujo caráter exemplar em defesa da ciência e comunidade científica frente às adversidades de cunho ideológico e político é uma marca e influência da qual carregarei como bússola por toda minha carreira acadêmica.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.