Plasma confinement by moving multiple mirrors

Be'ery, Ilan; Gertsman, Alexander; Seeman, Omri

doi:10.1088/1361-6587/aadd69

Cited by 13 publications

(6 citation statements)

References 17 publications

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“…That proposal renewed the idea of a plasma flow control with moving magnetic mirrors [10]. Recent analysis in [11] have shown that the modulation of the guiding magnetic field travelling in the laboratory reference frame may be achievable, but presumably restricts the usage of the superconducting magnetic system due to the mechanical stresses and coil quenching. Therefore, an emulation of the moving magnetic mirrors by the stationary magnetic field is still of sufficient interest.…”

Section: Introductionmentioning

confidence: 99%

First Experimental Campaign on SMOLA Helical Mirror

Sudnikov

Beklemishev

Поступаев

et al. 2019

Plasma and Fusion Research

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Experimental evidence of the plasma flow suppression by the helical magnetic mirror is presented. Reported experiments were done during the first plasma campaign in the SMOLA helical mirror device at self-consistent floating potentials of all in-vessel electrodes and at minimal magnetic fields suitable for confinement regime. The experimental results are consistent with two main theory predictions for the helical mirror confinement: a reduction of the axial plasma flow and the inward particle pinch. The helical mirror technology can dramatically improve fusion reactor prospects of open magnetic configurations.

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Section: Introductionmentioning

confidence: 99%

First Experimental Campaign on SMOLA Helical Mirror

Sudnikov

Beklemishev

Поступаев

et al. 2019

Plasma and Fusion Research

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“…GOL-NB is the representative of classical multiple-mirror configurations, which provide slowing down plasma expansion along the axis due to momentum transfer at collisional interaction of transiting and locally-trapped populations. Recently, an old idea of active multiple-mirror confinement [41] was reconsidered in two different approaches: with moving magnetic mirrors [42] and with rotating plasma in a helical mirror configuration [43,44]. Modular design of GOL-NB allows incorporation of an active section of a limited length into the magnetic structure that will expand the device capabilities when the main scientific goal will be achieved first.…”

Section: Discussion and Summarymentioning

confidence: 99%

Start of experiments in the design configuration of the GOL-NB multiple-mirror trap

Поступаев¹,

Batkin²,

Burdakov³

et al. 2022

Nucl. Fusion

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A multiple-mirror confinement is an alternative concept in the fusion energy development that improves the particle and energy confinement times in open traps (linear magnetic systems). The paper discusses the development progress of the GOL-NB multiple-mirror experiment that was recently commissioned in BINP. The reference description of the GOL-NB hardware is presented. Properties of a low-temperature start plasma are discussed. The first results from test experiments with injection of one 25 keV neutral beam are shown. Methods of plasma stabilization in the non-min-B configuration are discussed. In general, the on-going commissioning progress and results of the preliminary experiments are modestly optimistic for the expected device performance.

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“…As a concluding remark, we note that even in the optimal regime and in the cooling scenarios, where the flux is minimal, the improvement in confinement time due to MM is not enough for fusion. Therefore, to enhance confinement, a future study may consider more advanced control tools such as moving magnetic mirrors 34 and external RF fields.…”

Section: Discussionmentioning

confidence: 99%

“…For ideal gases, the adiabatic cooling law is T ∝ n γ−1 where γ = (d + 2) /d and d is number of degrees of freedom. 34 Plugging this relation in the MFP gives λ ∝ n 2γ−3 in the cooling scenario. Hence, the MFP will decrease on expansion for systems with d < 4 while an isothermal plasma is associated with the limit d → ∞.…”

Section: Thermodynamic Scenariosmentioning

confidence: 99%

Rate equations model for multiple magnetic mirrors in various thermodynamic scenarios

Miller,

Be'ery,

Barth

2021

Preprint

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Axial particle loss is one of the main challenges for fusion aimed, linear magnetic mirror plasma configurations. One way to mitigate this disadvantage and increase the confinement time is to use a multiple mirrors setup. The idea is to reduce the outgoing flux by collisions in the outer magnetic cells. Here, we develop a rate equation model for the ions density dynamics, including scattering within the magnetic cell and the transmission between neighboring cells. The dominant parameter is the ions' mean free path, which depends on the temperature and density in each cell. The steady-state flow is studied, analytically and numerically, for three thermodynamic scenarios: isothermal plasma, adiabatic expansion, and constant diffusion. It is found that the confinement time varies about five-fold over the different scenarios, where the adiabatic cooling is the best confining scenario. However, even in the best performing confinement scenario, the multiple mirror sections would need to be extremely long to approach fusion conditions.

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Plasma confinement by moving multiple mirrors

Cited by 13 publications

References 17 publications

First Experimental Campaign on SMOLA Helical Mirror

First Experimental Campaign on SMOLA Helical Mirror

Start of experiments in the design configuration of the GOL-NB multiple-mirror trap

Rate equations model for multiple magnetic mirrors in various thermodynamic scenarios

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