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Improved axial confinement in the open trap by the combination of helical and short mirrors

Published online by Cambridge University Press:  18 September 2024

Anton V. Sudnikov Open the ORCID record for Anton V. Sudnikov [Opens in a new window] ,
Ivan A. Ivanov Open the ORCID record for Ivan A. Ivanov [Opens in a new window] ,
Anna A. Inzhevatkina Open the ORCID record for Anna A. Inzhevatkina [Opens in a new window] ,
Aleksey V. Kozhevnikov ,
Vladimir V. Postupaev Open the ORCID record for Vladimir V. Postupaev [Opens in a new window] ,
Mikhail S. Tolkachev Open the ORCID record for Mikhail S. Tolkachev [Opens in a new window]  and
Viktor O. Ustyuzhanin Open the ORCID record for Viktor O. Ustyuzhanin [Opens in a new window]
Anton V. Sudnikov*
Affiliation:
Budker Institute of Nuclear Physics, Lavrentyev av., 11, Novosibirsk 630090, Russia
Ivan A. Ivanov
Affiliation:
Budker Institute of Nuclear Physics, Lavrentyev av., 11, Novosibirsk 630090, Russia
Anna A. Inzhevatkina
Affiliation:
Budker Institute of Nuclear Physics, Lavrentyev av., 11, Novosibirsk 630090, Russia
Aleksey V. Kozhevnikov
Affiliation:
Novosibirsk State University, Pirogov st., 1, Novosibirsk 630090, Russia
Vladimir V. Postupaev
Affiliation:
Budker Institute of Nuclear Physics, Lavrentyev av., 11, Novosibirsk 630090, Russia
Mikhail S. Tolkachev
Affiliation:
Budker Institute of Nuclear Physics, Lavrentyev av., 11, Novosibirsk 630090, Russia
Viktor O. Ustyuzhanin
Affiliation:
Budker Institute of Nuclear Physics, Lavrentyev av., 11, Novosibirsk 630090, 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, which was built in the Budker Institute of Nuclear Physics for the verification of the helical mirror confinement idea. This concept involves active control of axial losses from the confinement zone in an open magnetic trap through the use of multiple mirrors that move in the plasma frame of reference. The discussed experiments focused on determining the cumulative effect of a helical mirror system in combination with a short segment of a stronger magnetic field. Combination of these two methods of axial flow suppression results in higher efficiency compared with each method individually. Different combinations of the mirrors were tested. The most effective flow suppression was observed if the short mirror was placed between the confinement region and the helical mirror. In this configuration, an effective mirror ratio of $R_{{\rm eff}} = 32.6\pm 7.8$ was achieved, along with a more than three-fold increase in plasma density within the confinement region. The possibility of a cumulative effect of different types of magnetic mirrors offers a way to improve the confinement performance of the reactor-grade mirror confinement devices.

Keywords

plasma flowsplasma devicesplasma confinement
Type
Research Article
Information
Journal of Plasma Physics , Volume 90 , Issue 4 , August 2024 , 905900405
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Copyright
Copyright © The Author(s), 2024. Published by Cambridge University Press

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