Threefold Increase of the Bulk Electron Temperature of Plasma Discharges in a Magnetic Mirror Device

P. A. Bagryansky, A. G. Shalashov, E. D. Gospodchikov, A. A. Lizunov, V. V. Maximov, V. V. Prikhodko, E. I. Soldatkina, A. L. Solomakhin, and D. V. Yakovlev
Phys. Rev. Lett. 114, 205001 – Published 18 May 2015

Abstract

This Letter describes plasma discharges with a high temperature of bulk electrons in the axially symmetric high-mirror-ratio (R=35) open magnetic system gas dynamic trap (GDT) in the Budker Institute (Novosibirsk). According to Thomson scattering measurements, the on-axis electron temperature averaged over a number of sequential shots is 660±50eV with the plasma density being 0.7×1019m3; in few shots, electron temperature exceeds 900 eV. This corresponds to at least a threefold increase with respect to previous experiments both at GDT and at other comparable machines, thus, demonstrating the highest quasistationary (about 1 ms) electron temperature achieved in open traps. The breakthrough is made possible by application of a new 0.7  MW/54.5  GHz electron cyclotron resonance heating system in addition to standard 5 MW heating by neutral beams, and application of a radial electric field to mitigate the flute instability.

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  • Received 18 November 2014

DOI:https://doi.org/10.1103/PhysRevLett.114.205001

© 2015 American Physical Society

Authors & Affiliations

P. A. Bagryansky1,2,*, A. G. Shalashov1,3,4,†, E. D. Gospodchikov1,3,4, A. A. Lizunov1, V. V. Maximov1,2, V. V. Prikhodko1,2, E. I. Soldatkina1,2, A. L. Solomakhin1,2, and D. V. Yakovlev2

  • 1Budker Institute of Nuclear Physics, 11 Lavrentieva ave., 630090 Novosibirsk, Russia
  • 2Novosibirsk State University, 2 Pirogova str., 630090 Novosibirsk, Russia
  • 3Institute of Applied Physics, Russian Academy of Sciences, 46 Ulyanova str., 603950 Nizhny Novgorod, Russia
  • 4Lobachevsky State University of Nizhny Novgorod, 23 Gagarina ave., 603950 N. Novgorod, Russia

  • *p.a.bagryansky@inp.nsk.su
  • ags@appl.sci-nnov.ru

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Vol. 114, Iss. 20 — 22 May 2015

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