Kinetic instability observations in the Gas Dynamic Trap

Paper presents a brief overview of the studies carried out in 2016-2018 at the Gas Dynamic Trap device at the Budker Institute. These studies were focused on the experimental substantiation of a new version of the Gas Dynamic Multi-mirror Trap project, which is aimed at developing the key technologies needed to implement a number of thermonuclear applications of linear magnetic traps. The paper reviews the work aimed at stable plasma confinement under auxiliary ECR heating. We showed that a value of on-axis electron temperature up to 450 eV at plasma density 1.2 × 10 19 m −3 can be supported steadily. Studies on processes in expanders, which determine the axial thermal conductivity of the plasma, showed that the profile of the electric potential in the expander corresponds to a theory that gives favorable predictions regarding the thermal insulation properties of the expander. It was shown that the density of neutral gas in the expander in the range up to 10 20 m −3 does not have a significant effect on energy confinement in the trap, despite an estimate of the critical density of 10 18 m −3 .

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“…• stable high energy density plasma can be confined with simple circular magnets [10]; • micro-instabilities can be suppressed [11];…”

Section: Encouraging Results and New Ideas Underlying The Project Of mentioning

confidence: 99%

Studies of Plasma Confinement and Stability in a Gas Dynamic Trap: Results of 2016 - 2018

Bagryansky

Gospodchikov

Ivanov

et al. 2019

Plasma and Fusion Research

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“…He reviewed the perturbations spectra obtained for discharges with deuterium and deuterium-hydrogen plasmas and found their azimuthal and longitudinal wavenumbers using a crosscorrelation technique. The perturbations were identified as Alfven ion cyclotron (AIC) [42] and drift-cyclotron loss-cone (DCLC) [43] instabilities. It was found that the instabilities can impact the distribution function of anisotropic fast deuterium ions and that their features depend on the isotope composition of the bulk Maxwellian component of confined plasma.…”

Section: Simulations and Experimentsmentioning

confidence: 99%

Summary of the 3rd International Workshop on Gas-Dynamic Trap based Fusion Neutron Source (GDT-FNS)

Chen¹,

Bagryansky²,

Zeng³

et al. 2022

Nucl. Fusion

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The 3rd International Workshop on Gas-Dynamic Trap based Fusion Neutron Source (GDT-FNS) was held through the hybrid mode on 13-14 September 2021 in Hefei, China, jointly organized by the Hefei Institutes of Physical Science (HFIPS), Chinese Academy of Sciences (CAS), and the Budker Institute of Nuclear Physics (BINP), Russian Academy of Sciences (RAS). It followed the 1st GDT-FNS Workshop held in November 2018 in Hefei, China, and the 2nd taking place in November 2019 in Novosibirsk, Russian Federation. With the financial support from CAS and China Association for Science and Technology (CAST), this workshop was attended by more than 80 participants representing 20 institutes and universities from 7 countries, with oral presentations were broadcast via the Zoom conferencing system. 22 presentations were made with topics covering design and key technologies, simulation and experiments, steady-state operation, status of ALIANCE project, multi applications of neutron sources, and other concepts (Tokamaks, Mirrors, FRC, Plasma Focus, etc.). The workshop consensus was made including the establishment of ALIANCE International Working Group. The next GDT-FNS workshop is planned to be held in May 2022 in Novosibirsk.

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“…High frequency fluctuations of electromagnetic field inside the plasma column were studied in detail in the highenergy content regime of GDT operation [3]. It was shown that fluctuations detected are driven by Alfven Ion Cyclotron (AIC) instability.…”

Section: Study Of Micro-instabilitiesmentioning

confidence: 99%

“…Researches on the Gas Dynamic Trap (GDT) device at the Budker Institute of Nuclear Physics demonstrated the possibility to overcome these three deficiencies. Stable high energy density plasma can be confined with simple circular magnets [1,2], micro-instabilities can be tamed [3], and electron temperatures reaching a keV have been measured [4,5]. These three accomplishments provide a basis to reconsider the mirror concept as a neutron source for materials development, nuclear fuel production, and fusion energy production.…”

Section: Introductionmentioning

confidence: 97%

Recent progress of plasma confinement and heating studies in the gas dynamic trap

Bagryansky

Anikeev

et al. 2016

AIP Conference Proceedings

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Abstract. The paper includes a brief overview of previous researches on the stabilization of MHD instabilities, study of micro-instabilities, and demonstration a tangible increase of the electron temperature with application of auxiliary ECR heating. A review of the results of recent researches related to application of microwave radiation for plasma generation, and plasma heating in the GDT device is presented. The paper summarizes also recent results of researches that oriented on study of expander physics.

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Kinetic instability observations in the Gas Dynamic Trap

Cited by 16 publications

References 9 publications

Studies of Plasma Confinement and Stability in a Gas Dynamic Trap: Results of 2016 - 2018

Studies of Plasma Confinement and Stability in a Gas Dynamic Trap: Results of 2016 - 2018

Summary of the 3rd International Workshop on Gas-Dynamic Trap based Fusion Neutron Source (GDT-FNS)

Recent progress of plasma confinement and heating studies in the gas dynamic trap

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