Toroidal flow-caused change in magnetic topology of equilibrium eigenstates
Φόρτωση...
Ημερομηνία
Συγγραφείς
Poulipoulis, G.
Throumoulopoulos, G. N.
Tasso, H.
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Εκδότης
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Είδος δημοσίευσης σε συνέδριο
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peer reviewed
Είδος εκπαιδευτικού υλικού
Όνομα συνεδρίου
Όνομα περιοδικού
Physics of Plasmas
Όνομα βιβλίου
Σειρά βιβλίου
Έκδοση βιβλίου
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Περιγραφή
Equilibrium eigenstates of an axisymmetric magnetically confined plasma with toroidal flow are investigated by means of exact solutions of the ideal magnetohydrodynamic equations. The study includes. "compressible" flows with constant temperature T(psi), but varying density on magnetic surfaces and incompressible ones with constant density rho(psi), but varying temperature thereon [the function psi(R, z) is the poloidal magnetic flux function with (R, z, phi) cylindrical coordinates]. These variations are nedessary for the existence of tokamak steady states with flow. The "compressible" and incompressible solutions are associated with the ansatz to omega(2)/T proportional to M-0 = const and d(rho omega(2))/d psi = A psi, respectively, where omega(psi) is the rotation frequency. In both cases eigenfunctions of the form psi(ln) = Z(l)(z)R-n(R) (l, n = 1, 2,...) describe configurations with f X n magnetic axes. A connection between multitoroidal configurations and reversed magnetic shear is also identified. Owing to the flow, the respective eigenvalues can be considered in two alternative ways: either as flow eigenvalues, M-0(l) and A(l), which depend on a pressure parameter P-0 or as pressure eigenvalues P-0(l), which depend on the flow parameters, M-0 or A. In the context of the latter consideration when the flow parameters are varied continuously there are transition points, (M-0)(m) and A(m) (m = 1,2,...), at which an additional magnetic axis is formed. This flow-caused* change in magnetic topology is possible solely in the presence of toroidicity because in the limit of infinite aspect ratio the axial flow does not appear in the equilibrium equation. Also, the lower the aspect ratio the smaller (M-0)(m) and A(m). In addition, the effects of the flow and the aspect ratio on the Shafranov shift are evaluated along with the variations of density and temperature on magnetic surfaces. (c) 2005 American Institute of Physics.
Περιγραφή
Λέξεις-κλειδιά
ideal magnetohydrodynamic equilibria, incompressible flows, plasma, tokamak, suppression, rotation, shift
Θεματική κατηγορία
Παραπομπή
Σύνδεσμος
<Go to ISI>://000228865900015
http://link.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=PHPAEN000012000004042112000001
http://link.aip.org/getpdf/servlet/GetPDFServlet?filetype=pdf&id=PHPAEN000012000004042112000001
Γλώσσα
en
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Γενική Περιγραφή / Σχόλια
Ίδρυμα και Σχολή/Τμήμα του υποβάλλοντος
Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών