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Monday, July 27, 2020 | History

2 edition of Magnetic and drift surfaces, current configuration of stellarator field. found in the catalog.

Magnetic and drift surfaces, current configuration of stellarator field.

KenroМ„ Miyamoto

Magnetic and drift surfaces, current configuration of stellarator field.

by KenroМ„ Miyamoto

  • 205 Want to read
  • 20 Currently reading

Published by Institute of Plasma Physics, Nagoya University] in [Nagoya, Japan .
Written in English

    Subjects:
  • Stellarators.

  • Edition Notes

    Includes bibliographical references.

    SeriesResearch report ;, IPPJ-95, Research report (Nagoya Daigaku. Purazuma Kenkyūjo) ;, IPPJ-95.
    Classifications
    LC ClassificationsQC717.6 .N35 no. 95, QC718.64 .N35 no. 95
    The Physical Object
    Pagination23 p.
    Number of Pages23
    ID Numbers
    Open LibraryOL5163895M
    LC Control Number74576039

    Fusion energy is widely considered a potentially clean and abundant energy source [1, 2].Current mainline research in magnetic confinement fusion is based on the tokamak concept [], in spite of the important drawback posed by the possibility of disruptions and the challenge of steady-state pondingly, alternatives based on the stellarator concept have also been developed Author: V. Queral, F. A. Volpe, D. Spong, S. Cabrera, F. Tabarés. The thrust of the study is to find out how compact a quasi-helically symmetric stellarator (QHS) can be. Drift orbits of particles are confined (deviating from flux surfaces by at most a banana width) if the magnetic spectrum in a coordinate system whose Jacobian is proportional to 1/B2 is dominated by a single helical component.

    closed magnetic surfaces. Fig. 1 shows the structure of magnetic surfaces along the whole ring and coil arrangement. Figure 1: Schematic structure of ring built with identical toroidal segments. Colour coding on the magnetic surface indicates the magnetic field strength distribution. The transverse R xB beam drift arising from curved magnetic. texts All Books All Texts latest This Just In Smithsonian Libraries FEDLINK (US) Genealogy Lincoln Collection. Books to Borrow. Top Full text of "Magnetic and drift surfaces .

    that have tokamak transport and stellarator stability ¾In 3-D magnetic field topology, particle drift trajectories depend only on the strength of the magnetic field not on the shape of the magnetic flux surfaces. QA stellarators have tokamak-like field topology. ¾Stellarators with externally supplied poloidal flux have shown resilience to. and stellarators, magnetic field is inevitably inhomo-geneous. When plasma is maintained in equilibrium in such a field, a dipole current appears to compensate the toroidal drift of charged particles. This pressure-in-duced current, flowing along the whole system, is called Pfirsch-Schltiter (PS) current. It becomes larger with in-.


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Magnetic and drift surfaces, current configuration of stellarator field by KenroМ„ Miyamoto Download PDF EPUB FB2

Magnetic surfaces and drift surfaces of a single charged particle of a stellarator field are analyzed by using an average method.

The dependence of the rotational transform angle and the magnetic well depth on the parameters of the current configuration of the stellarator field are studied for the case of long and short pitch of the helical windings to find the optimum by: 2.

Magnetic surfaces and drift surfaces of a single charged particle of a stellarator field are analyzed by using an average method. The dependence of the rotational transform angle and the magnetic well depth on the parameters of the current configuration of the stellarator field are studied for the case of long and short pitch of the helical windings to find the optimum parameters.

Dependence of various quantities (rotational transform angle, shear, magnetic well depth) of average minimum B field of stellarator type on the geometrical parameters of the current configurations and the possible ranges of the values of these quantities are studied.

These results are compared with computed : Kenro Miyamoto. A new Magnetic and drift surfaces expansion has been devised, wherein the depths of the helical and toroidal field modulations are comparable and the total rotational transform is finite.

To accomplish this, we define λ = ρ/R ≪ 1 (R is the major radius, ρ is the minor radius) and choose p, the number of helical periods, to be of order λ −2/ed calculations of vacuum magnetic field properties Cited by: Title: Magnetic Surfaces of Stellarator Field with a Current-Carrying Plasma: Authors: Miyamoto, Kenro; Inoue, Nobuyuki: Affiliation: AA(Department of Engineering, The University of Tokyo,).

To date, only electromagnetic coils have been used to generate 3D fields for stellarators. Permanent magnets provide an alternative way to produce the desired magnetic field for optimized stellarators.

In this paper, we revisit the concept of representing surface current using magnetic dipoles and carry out numerical validations. Tokamaks are rotationally symmetric and use a large plasma current to achieve confinement, whereas stellarators are non-axisymmetric and employ three-dimensionally shaped magnetic field coils.

The stellarator’s lack of a strong current parallel to the magnetic field greatly reduces macroscopic plasma instabilities, and it eliminates the need for steady-state current by: In the case of bell-shaped (or parabolic) radial current-density distribution, the magnetic surfaces of the stellarator can acquire a rosette structure.

When the longitudinal current attains certain values, the separatrix is uncovered, i. the magnetic configuration is broken up. Effects of 3D Magnetic Field Structure to MHD Equilibrium and Stability 4th International ITER Summer School Austin 31 May - 4 June, Vacuum flux surfaces in a heliotron configuration Stellarator field has toroidal periodicity.

magnetic surfaces 3-D equilibrium consistent with experimental observation, i.e.,File Size: 8MB. Field line tracing has been performed for a number of NCSX configurations and tend to be qualitatively similar.

The field line features most commonly observed may be seen in Fig. 1(a)–(d), which is the Poincare section data for the NCSX configuration m50_, a multifilament model, at cross-sections in toroidal angles, 0°, 30°, 60° and 90°. Field lines are started at a series of Cited by: 2. To measure the magnetic field, the scientists launched an electron beam along the field lines.

They next obtained a cross-section of the entire magnetic surface by using a fluorescent rod to intersect and sweep through the lines, thereby inducing fluorescent light in the shape of the surface. Golovato and J. Shohet,Transit-time magnetic pumping of an electron beam in the Proto-Cleo stellarator, Phys.

Fluids19 (), – Article Google ScholarCited by: 1. The existence of a vacuum magnetic well is generally accepted as a prerequisite to start-up. The special set of modular-stellarator configurations selected for the present computational investigation was derived from coefficients and equations that produced finite-beta wells in a continuous-current-sheet representation.

The corresponding coils did not produce magnetic wells in a vacuum Author: C.G. Lilliequist. In a quasi-symmetric field, the magnetic field should be expressible as a function of the flux surface and a single helicity angle. Within a given flux surface, a guiding center cannot distinguish what field line it is on and the rotational transform is by: 7.

The magnetic configuration of a stellarator with an embedded magnetic mirror is arranged in the Uragan-2M experimental device by switching off one toroidal coil. The second stage of the design, which is the topic of this article, is to design a set of discrete current-carrying coils that creates the required external 'vacuum' field for confining the 'reference plasma' configuration.

The vacuum field, by which we mean the magnetic field produced by currents external to the plasma domain, must balance Cited by: 8. Eventually, the stellarator should be able to produce a steady-state (for at least 30 minutes!) plasma of 10 MW in the second operation phase in The first plasma of Wendelstein 7-X on Decem CET.

This first plasma was made with the noble gas Helium. experimental measurements confirms that the current configuration has excellent magnetic surface quality and an aspect ratio A ≤, which is the lowest aspect ratio of the present day stellarators.

References [1] T. Sunn Pedersen and A. Boozer, Confinement of Nonneutral Plasmas on Magnetic Surfaces, Phys. Rev. Lett. 88, (). Four cross sections of an optimized stellarator configuration showing the comparison of a desired plasma shape with magnetic surfaces traced in the vacuum field of an I = 2 winding law.

The five small circles with minus signs indicate filaments defining an outer helical coil, while the larger. Stellarator plasmas thus run little risk of disrupting, as can happen in tokamaks, causing the internal current to abruptly halt and fusion reactions to .Effects of Toroidal Currents upon Magnetic Configurations and Stability in WENDELSTEIN 7-AS A.

Weller 1), M. Anton 1), R. Brakel 1), J. Geiger 1), M. Hirsch 1), R. Jaenicke 1), provided by the stellarator field and by the toroidal current, respectively, and q is the safety break-up of the magnetic surfaces.

The last conjecture is.A stellarator in which a helical coil is used to confine the plasma, together with a pair of poloidal field coils to provide a vertical field. Toroidal field coils can also be used to control the magnetic surface characteristics.

The Large Helical Device in Japan uses this configuration. Modular stellarator.