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Preliminary experimental scaling of the helical mirror confinement effectiveness

Part of: Open Magnetic Systems for Plasma Confinement Focus on Fusion

Published online by Cambridge University Press:  21 October 2020

Anton V. Sudnikov Open the ORCID record for Anton V. Sudnikov [Opens in a new window] ,
Aleksey D. Beklemishev ,
Anna A. Inzhevatkina ,
Ivan A. Ivanov Open the ORCID record for Ivan A. Ivanov [Opens in a new window] ,
Vladimir V. Postupaev ,
Aleksandr V. Burdakov ,
Vladimir V. Glinskiy ,
Konstantin N. Kuklin ,
Andrey F. Rovenskikh  and
Viktor O. Ustyuzhanin
Anton V. Sudnikov*
Affiliation:
Budker Institute of Nuclear Physics, Lavrentyev av., 11, Novosibirsk 630009, Russia
Aleksey D. Beklemishev
Affiliation:
Budker Institute of Nuclear Physics, Lavrentyev av., 11, Novosibirsk 630009, Russia
Anna A. Inzhevatkina
Affiliation:
Budker Institute of Nuclear Physics, Lavrentyev av., 11, Novosibirsk 630009, Russia
Ivan A. Ivanov
Affiliation:
Budker Institute of Nuclear Physics, Lavrentyev av., 11, Novosibirsk 630009, Russia
Vladimir V. Postupaev
Affiliation:
Budker Institute of Nuclear Physics, Lavrentyev av., 11, Novosibirsk 630009, Russia
Aleksandr V. Burdakov
Affiliation:
Budker Institute of Nuclear Physics, Lavrentyev av., 11, Novosibirsk 630009, Russia
Vladimir V. Glinskiy
Affiliation:
Novosibirsk State University, Pirogov st., 2, Novosibirsk 630009, Russia
Konstantin N. Kuklin
Affiliation:
Budker Institute of Nuclear Physics, Lavrentyev av., 11, Novosibirsk 630009, Russia
Andrey F. Rovenskikh
Affiliation:
Budker Institute of Nuclear Physics, Lavrentyev av., 11, Novosibirsk 630009, Russia
Viktor O. Ustyuzhanin
Affiliation:
Novosibirsk State University, Pirogov st., 2, Novosibirsk 630009, Russia
*
†Email address for correspondence: A.V.Sudnikov@inp.nsk.su
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Abstract

The paper presents experimental results from the SMOLA device that is the first facility with a helical mirror section of the magnetic field. This device is built in the Budker Institute of Nuclear Physics for the verification of the helical mirror confinement idea that is the recently introduced technique of the active control of axial losses from a confinement zone. Theory predicts that with rotating plasma, a helical mirror will provide suppression of the axial plasma flow and, simultaneously, density pinching to the axis. Experiments demonstrated that plasma density at the exit from the transport section is suppressed with activation of the helical field, the effect is significant and highly reproducible. The most pronounced effect is observed on the plasma periphery, where the mirror ratio is the highest. The integral suppression ratio reaches 2–2.5 in the discussed experiments. Experimental results are compared with simplified theoretical estimates. The integral suppression ratio matches the simple theoretical estimates even if the transversal diffusion is neglected.

Keywords

plasma confinementplasma flows
Type
Research Article
Information
Journal of Plasma Physics , Volume 86 , Issue 5 , October 2020 , 905860515
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press

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