Kinetic instabilities in two-isotopic plasma in the gas-dynamic trap magnetic mirror

被引：0
作者：
Shmigelsky, Evgeniy A. [1 ,2 ,3 ]
Meyster, Andrey K. [1 ]
Chernoshtanov, Ivan S. [1 ,2 ]
Lizunov, Andrej A. [1 ,2 ]
Solomakhin, Alexander L. [1 ,2 ,3 ]
Yakovlev, Dmitry V. [1 ]
机构：
[1] Russian Acad Sci, Siberian Branch, Budker Inst Nucl Phys, Acad Lavrentieva Pr 11, Novosibirsk 630090, Russia
[2] Novosibirsk State Univ, Pirogova St 1, Novosibirsk 630090, Russia
[3] Russian Acad Sci, AV Gaponov Grekhov Inst Appl Phys, Fed Res Ctr, Ulyanova St 46, Nizhnii Novgorod 603950, Russia
来源：
JOURNAL OF PLASMA PHYSICS | 2024年 / 90卷 / 06期
基金：
俄罗斯科学基金会;
关键词：
fusion plasma; plasma instabilities; ION-CYCLOTRON INSTABILITY; LOSS-CONE INSTABILITY; STABILIZATION; CONFINEMENT;
D O I：
10.1017/S0022377824001399
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
A fusion neutron source (FNS) based on the gas-dynamic trap (GDT, Budker Institute, Novosibirsk) is considered for confinement of two-species plasma heated by neutral beam injection in a regime where the fast ion distribution function is far from Maxwellian. Kinetic instabilities are expected to develop in this regime, and in this paper we investigate the ion-cyclotron instability evolving in moderate densities of pure hydrogen and mixed deuterium-hydrogen target plasmas. The properties of the studied unstable mode, such as its azimuthal wavenumbers, propagation direction and its being affected by changes in the bulk plasma density and composition, allow us to identify it as the drift cyclotron loss cone (DCLC) instability. This mode scatters fast ions and thereby leads to drops in diamagnetic flux signals and increases longitudinal energy and particle losses, with the average energy of the lost ions estimated to be far above the temperature of warm Maxwellian ions. Our interpretation is that the unstable wave grows due to interaction with the fast ions located near the loss cone in the velocity space and scatters them. Applying the method of suppressing the DCLC instability by filling the loss cone with warm plasma, we have determined the values of plasma density and deuterium percentage that allow us to suppress the DCLC instability in the GDT. These findings justify using mixed bulk plasmas in fusion neutron source operation.
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页数：24
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