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AbstractAbstract
[en] The problem of constructing flux coordinates for a tokamak is discussed. Different coordinate systems are considered using a unified approach. The problem is formulated in terms of two magnetic differential equations with known right-hand sides. The construction of tokamak flux coordinates with straightened field lines reduces to the problem of calculating one or two integrals around a poloidal contour on a magnetic surface. Three coordinate systems are analyzed, specifically, coordinates with a prescribed toroidal angle and Hamada and Boozer coordinates. It is shown how one coordinate system can be transformed into another and how the required calculations can be performed without a complete change of variables. The results obtained are intended to be used in practical manipulations with flux coordinates
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Translated from Fizika Plazmy, ISSN 0367-2921, 24, 554-564 (June 1998); (c) 1997 MAIK/Interperiodika; Country of input: International Atomic Energy Agency (IAEA)
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Redjdal, M.; Kakay, A.; Trunk, T.; Ruane, M. F.; Humphrey, F. B.
Funding organisation: (United States)2001
Funding organisation: (United States)2001
AbstractAbstract
[en] Three-dimensional magnetic structures of pi-vertical-Bloch line (VBL) and 2pi-VBL are investigated in 80 - 320-nm-thick Permalloy films using direct integration of the Landau - Lifshitz - Gilbert equation in an 128x128x80 point Cartesian lattice. A pi-VBL reflects the shapes of its adjacent walls, which change with film thickness. The pi-VBL conducts the flux between walls of opposite chirality by letting the magnetization rotate out of the plane of the walls via a vortex structure. The Neel caps switch chirality via a 'converging point,' or cross-tie, flux at one surface and a vortex flux, or a swirl, at the other surface. The pi-VBL energy per unit area is 0.44, 0.20, and 0.30 erg/cm2 in 80, 160, and 320 nm films, respectively. The corresponding pi-VBL widths are 88, 60, and 86 nm. A stable winding 2pi-VBL structure was also computed by combining two pi-VBL structures of appropriate chirality. The Neel caps intersect via the pair-(swirl, converging point) like flux at both surfaces. The width of the 2pi-VBL is 140 nm and its energy per unit area is 0.57 erg/cm2. [copyright] 2001 American Institute of Physics
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Othernumber: JAPIAU000089000011007609000001; 202111MMM; The American Physical Society
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Journal of Applied Physics; ISSN 0021-8979;
; v. 89(11); p. 7609-7611

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AbstractAbstract
[en] A problem of constructing the flux coordinates for a tokamak is discussed. The problem is formulated in the form of two magnetic differential equations with a known right part. The construction of the flux coordinates with straightened force lines for a tokamak is reduced to calculation of one or three contour integrals in the cross section of a magnetic surface. Three versions of the flux coordinates are considered. A technique for transition from one coordinates to other ones is described
Original Title
Potokovye koordinaty dlya tokamaka
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37 refs., 2 figs.
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No abstract available
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Letter-to-the-editor.
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Nuclear Fusion; v. 16(1); p. 154-157
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[en] The method to construct the generalized magnetic coordinate system is presented, which describe the magnetic field with and without magnetic surfaces. The method is applied to a simple analytic field. (author)
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Ueda, Y. (Osaka Univ., Suita (Japan)); Iguchi, H.; Matsuoka, K.; Sudo, S. (eds.); 540 p; ISBN 4-9900586-3-3;
; 1998; p. 491-494; ISC-11: 11. international stellarator conference; Toki, Gifu (Japan); 29 Sep - 3 Oct 1997; ITC-8: 8. international Toki conference on plasma physics and controlled nuclear fusion; Toki, Gifu (Japan); 29 Sep - 3 Oct 1997

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No abstract available
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Cetin, S. A.; Hikmet, I.; Balkan Physical Union; Turkish Physical Society (TR); Istanbul University (TR); Yildiz Technical University (TR). Funding organisation: Bogazici University (Turkey); Dogus University (Turkey); European Physical Society (France); Governorship of Istanbul (Turkey); Istanbul Metropolitan Municipality (Turkey); Turkish Atomic Energy Authority (Turkey); The Scientific and Technical Research Council of Turkey (Turkey); UNESCO (United Nations (UN)); Nel Electronic (Turkey); 1218 p; 2007; p. 336; 6. International Conference of the Balkan Physical Union; Istanbul (Turkey); 22-26 Aug 2006; Available from President of Turkish Physical Society, Prof. Dr. Baki AKKUS, e-mail: akkus@istanbul.edu.tr
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[en] We have studied fluxoid quantization effects in mesoscopic Al samples consisting of a small number of square loops. In short microladders a pronounced substructure of the Little-Parks oscillations (i.e. the oscillations of the critical temperature Tc as a function of the applied magnetic flux φ) has been found. These new features in Tc(φ) originate from transitions between different quantum states, each having a specific order parameter profile and flow pattern of the supercurrents. The experimental data are in excellent agreement with the Tc(φ) calculated within the de Gennes-Alexander model for superconducting micronetworks. (orig.)
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[en] Effective method is proposed to construct the flux coordinates for toroidal plasma equilibrium configurations. This method is applied to conventional stellarators. Three kinds of flux coordinates are considered: coordinates with a fixed toroidal angle, Hamada and Boozer coordinates. (author)
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Ueda, Y. (Osaka Univ., Suita (Japan)); Iguchi, H.; Matsuoka, K.; Sudo, S. (eds.); 540 p; ISBN 4-9900586-3-3;
; 1998; p. 456-459; ISC-11: 11. international stellarator conference; Toki, Gifu (Japan); 29 Sep - 3 Oct 1997; ITC-8: 8. international Toki conference on plasma physics and controlled nuclear fusion; Toki, Gifu (Japan); 29 Sep - 3 Oct 1997

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[en] An outer magnetic field may penetrate superconducting material in form of quantised flux tubes. It they are pinned to defects in the material the superconductor can carry electric power without loss. Power carrying capcities are limited because flux lines may depin because of their temperature fluctuation. (orig.)
[de]
In supraleitende Materialien kann ein aeusseres Magnetfeld in Form von quantisierten Flussschlaeuchen eindringen. Wenn sie an Defekten im Material verankert sind, kann der Supraleiter elektrischen Strom verlustfrei tragen. Die Stromtragfaehigkeit der neuen Hochtemperatursupraleiter wird dadurch begrenzt, dass sich die Flusslinien durch ihre Temperaturbewegung aus den Verankerungszentren losreissen koennen. (orig.)Original Title
Flusslinien in Supraleitern
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No abstract available
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nd; 105 p; International conference on magnetic structures in superconductors; Argonne, Illinois, USA; 5 Sep 1973; CONF-730978--(ABSTS.)
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