Investigation of plasma response influence on the penetration of an external low frequency helical perturbation into a tokamak edge plasma

Abstract

The plasma response influence on the penetration of an external low frequency helical perturbation into a tokamak edge plasma has been studied on the basis of the two-fluid MHD equations in the linear approximation for the cylindrical model. Components of the penetrating field, the plasma flows, the perturbation current density distribution and the radial profile of the poloidal driven force density are found in the resonant region and investigated for the parameters of the TEXTOR-DED, CSTN-IV and HYBTOK-II tokamaks. Preliminary comparisons with the CSTN-IV and HYBTOK-II experiments are made and a good qualitative agreement has been found.

Toroidal consideration of plasma response to penetration of an external low frequency helical perturbation into a tokamak edge plasma

“…formally coincide with Eqs. (4), (7) of cylindrical model [2]. Recall that the solutions of cylindrical equations are shown for TEXTOR -DED in Fig.3 of Ref.…”

“…Recall that the solutions of cylindrical equations are shown for TEXTOR -DED in Fig.3 of Ref. [2]. In Eq.…”

“…In cylindrical model the penetration of external perturbations was investigated in [2]. The toroidal modelling (without consideration of the plasma response) shows a more strong perturbation decrease with the distance from DED coils as compared with the cylindrical model (see, e.g., [1]).…”

"Teoria e modelamento computacional de aquecimento de plasma por ondas de alfvén no tokamak TCABR"

“…Análises teóricas de absorção pelo plasma de campos de rotação de baixa freqüência (RLF) e efeitos de forças ponderomotoras produzidos por correntes da bobina do EML e do DED na borda do plasma já foram anteriormente realizadas [31][32][33]. Mostrou-se que a rotação dos campos de LF podem produzir aquecimento adicional e fluxo de plasma na ressonância local das ondas de Alfvén com ω = |k |c A ,…”

“…Na figura 3.15 podemos ver que, no caso do código cinético, a distribuição de potência dissipada tem um comportamento fora da realidade nos pontos ao redor de k = 0, sendo o problema também acarretado pelas divergências numéricas dos campos nessa região. Neste caso a dependência do campo E em função de k é da forma ık ε 33 …”