About the Values of the Stray Environment Fields-to-Toroidal-Coil Magnetic Field Ratio in the Uragan-2M Torsatron

doi:10.26565/2312-4334-2016-3-09

G. G. Lesnyakov Institute of Plasma Physics, National Science Center “Kharkiv Institute of Physics and Technology”, 1, Akademichna st., 61108, Kharkiv, Ukraine, Tel.: +38(057)335-64-37; Fax +38(057)335-26-64
A. N. Shapoval Institute of Plasma Physics, National Science Center “Kharkiv Institute of Physics and Technology”, 1, Akademichna st., 61108, Kharkiv, Ukraine, Tel.: +38(057)335-64-37; Fax +38(057)335-26-64

DOI: https://doi.org/10.26565/2312-4334-2016-3-09

Keywords: Stellarator, Torsatron, Tokamak, Magnetometer, Electron beam, Particle orbits, Magnetic surfaces, Stray environment magnetic fields, Environment magnetism, Nonmagnetic stainless steel

Abstract

The values of stray environment magnetic fields of the Uragan-2M torsatron have been determined using local magnetic sensors, and also, the electron beam injection in the additional toroidal magnetic field (16 coils, making up 60% to 76% of the total toroidal field). In the stationary toroidal magnetic field, the turns of the electron beam have been visualized by scanning the poloidal vacuum chamber cross-section with a luminescent rod. The measurements have made it possible to determine a decrease in the ratio of stray environment vertical magnetic fields to toroidal-coil magnetic field down to z/BT ≈ 1×10-3 at magnetic fields ВТ = 0.0225 - 0.15 T, and also, to estimate the prospect of the ratio decrease to z/BT ≈ 1×10-4 as the toroidal magnetic field increases up to ВТ ≥ 0.45 Т.

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Author Biography

G. G. Lesnyakov, Institute of Plasma Physics, National Science Center “Kharkiv Institute of Physics and Technology”, 1, Akademichna st., 61108, Kharkiv, Ukraine, Tel.: +38(057)335-64-37; Fax +38(057)335-26-64

References

Popryadukhin A.P. Behavior of stellarator closed magnetic field lines in the presence of disturbances // Zh. Tekh. Fiz. [Sov. Phys. Tech. Phys.].-1964.-Vol.34.-No.4.-P.658-665 (in Russian).

Voronov G.S., Popryadukhin A.P. Experimental study of the disturbance effect on the helical magnetic field // Zh. Tekh. Fiz. [Sov. Phys. Tech. Phys.].-1964.–Vol.34.-No.10.-P.1786-1789 (in Russian).

Mal’tsev S.G., A.P. Popryadukhin A.P. Magnetic measurements in the tokamak with TO-2 divertor // Fiz. Plazmy [Sov. J. Plasma Phys.].-1988.-Vol.14.-No.7.-P.801-806 (in Russian).

Al’khimovich V.A., Akhtyrskii S.V., Babaev I.V., Belikov M.M., Berezovskii E.L., Bondarchuk E.N., et al. Physics Results of the Start up of the T-15 installation // Voprosy Atomnoj Nauki I Tekh. Ser.: Thermonucl. Fusion, M,-1998.-Issue 3.-P.3-17 (in Russian).

Neubauer F.H., Bohn F.H., Chudnovskij A., Giesen B., Heuttemann P., Lochter M. ANS Fusion Technol.-1997.–Vol.31.–P.154-158.

England A.C., Yoon S.W., Kim W.C., Lee D.K., Chung J., Lee K.D., et al. Tokamak field error measurements with an electron beam in KSTAR // Fusion Eng. Design.-2011.-Vol.86.-P.20-26.

Firpo M.-C. Microtearing turbulence: Magnetic braiding and disruption limit // Physics of Plasmas.-2015.-22.-122511; http://dx.doi.org/10.1063/1.4938273.

Bykov V. E., Georgievskij A. V., Demchenko V. V., Kuznetsov Yu. K., Litvinenko Yu. A., Longinov A. V., Pavlichenko O. S., Rudakov V. A., Stepanov K. N., Tolok V. T. URAGAN-2M: a torsatron with an additional toroidal field // Fusion Technology.-1990.-Vol.17.-P.140-147.

Pavlichenko O. S. for the U-2M group. First results from the “URAGAN-2M” torsatron // Plasma Phys. Control. Fusion.-1993.-Vol.35.-P.B223-B230. 10. Pavlichenko O. S. Status of “URAGAN-3M” and “URAGAN-2M” experiments // Stellarators and other helical confinement systems, 10-14 May 1993, Garching, Germany. A Collection of Papers Presented at the IAEA Technical Committee Meeting, IAEA, Vienna.-1993.-P.60-77.

Lesnyakov G.G., Pogozhev D.P., Kuznetsov Yu.K., et al. Studies of magnetic surfaces in the “Uragan-2M” torsatron // 23th EPS Conf. on Control. Fusion and Plasma Phys. (Kiev, 24-28 June, 1996). Contributed Papers, EPS.-1996.-Vol.20C.-Part II, b025.-P.547-550.

Azhazha V.M., Desnenko V.A., Ozhigov L.S., Azhazha Zh.S., Svechkarev I.V., Fedorchenko A.V. Using magnetic methods for investigations on the austenitic stainless steel structure evolution after long operation in the NPP power units // Probl. of Atomic Sci. and Technol. Ser.: Phys. Radiation Damages and Radiation Mater. Sci.-2009. (94). NCS KPTI, Kharkiv, Ukraine,-No.4-2.-P.241-246 (in Russian).

Morisaki T., Shoji M., Masuzaki S., Sakakibara S., Yamada H., Komori A., Motojima O. and the LHD experimental group. Flux surface mapping in LHD // Proceedings of ITC/ISHW. -2007.

Hailer H., Massing J., Schuler F., et al. Studies the magnetic surfaces in the stellarator Wega // 14 EPS Conf. on Contr. Fusion and Plasma Phys. Madrid, 1987. Contributed Papers.-1987.-11 D.-Part I.-P.423-426.

Tou T.Y., Blackwell B.D., Sharp L.E. Magnetic field mapping using an image-intensifying fluorescent probe // Rev. Sci. Instrum.-1991.-Vol.62.-P.1149-1156.

Lesnyakov G.G., Volkov E.D., Georgievskij A.V., et al. Study of the magnetic configuration of l=3 torsatron by the triode and the luminescent rod methods // Nuclear Fusion.-1992.-Vol.32.-P.2157-2176.

Jaenicke R., Ascasibar E., Grigull P., et al. Detailed investigation of the vacuum magnetic sufaces on the W7-AS stellarator // Nuclear Fusion.-1993.-Vol.33.-P.687-704.

Shats M.G., Rudakov D.L., Blackwell B.D., et al. Experimental investigation of the magnetic structure in the H-1 heliac // Nuclear Fusion.-1994.-Vol.34.-P.1653-1661.

Tereshin V.I., Beletskii A.A., Berezhnyj V.L., et al. First results of the renewed URAGAN-2M torsatron // 35th EPS Conf. on Plasma Phys (Hersonissos, 9-13 June 2008), ECA.-2008.-Vol.32.- P-1.061.

Gubarev S.P., Ermakov E.B., Lesnyakov G.G., et al. Measuring-controlling complex for investigating the magnetic surfaces of torsatron “Uragan-2M” // Probl. of Atomic Sci. and Technol. Ser.: Plasma Phys. (15), NCS KPTI, Kharkiv, Ukraine.-2009.-№.1 (59).-P.177-179 (in English).

Lesnyakov G.G., Shapoval A.N., Pavlichenko O.S. Feasibility of creating an island divertor in the Uragan-2M torsatron // Probl. of Atomic Sci. and Technol. Ser.: “Plasma Phys.”, Issue 18, NSC KPTI, Kharkov, Ukraine.-2012.-№.6.-(82).-34-37 (in English).

Lesnyakov G.G., Shapoval A.N., Gubarev S.P., et al. Magnetic surfaces of stellarator-mirror hybrid in the Uragan-2M torsatron // Probl. of Atomic Sci. and Technol. Ser.: “Plasma Phys.”, Issue 19. NSC KPTI, Kharkov, Ukraine.-2013.-№.1.-(83).-57-60 (in English).

Kotenko V.G. A special correcting winding for the l=2 torsatron with split-type helical coils // Fusion Eng. Design.-2012.-Vol.87.-P.118-123.

Kotenko V.G. A special correcting winding for the l=2 torsatron with internal splitting of helical coils // Probl. of Atomic Sci. and Technol. Ser.: Plasma Phys. Issue 19, NCS KPTI, Kharkov, Ukraine.-2013.-№.1 (83).-P.24-26 (in English); http://vant.kipt.kharkov.ua.