First Experimental Campaign on SMOLA Helical Mirror

Sudnikov, A. V.; Beklemishev, A. D.; Поступаев, В. В.; Иванов, И. А.; Inzhevatkina, Anna A.; Sklyarov, V. F.; Burdakov, A. V.; Kuklin, K. N.; Rovenskikh, A. F.; Melnikov, N. A.

doi:10.1585/pfr.14.2402023

Cited by 15 publications

(7 citation statements)

References 16 publications

(15 reference statements)

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“…In the experiment, plasma stream produced by a plasma gun was passed through a helical multi-mirror section. It was observed that plasma flow at the end of the section was significantly decreased in agreement with the theoretical prediction [23] independently from the plasma collisionality varied in the broad range [24]. This result is rather promising for the application of such an end section in the GDT-based neutron source for the reduction of plasma end losses.…”

Section: Simulations and Experimentssupporting

confidence: 76%

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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Section: Simulations and Experimentssupporting

confidence: 76%

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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“…Concept exploration of the helical mirror SMOLA was put into operation at Budker Institute of Nuclear Physics at the end of 2017 (Postupaev et al 2016;Sudnikov et al 2017). Axial plasma flux suppression by the helical sections was demonstrated in the first experimental campaign, an integral suppression ratio of 2-2.5 was achieved (Sudnikov et al 2019). An improvement of the suppression ratio with the increase of the magnetic field, corrugation ratio and plasma rotation velocity was demonstrated (Sudnikov et al 2020).…”

Section: Introductionmentioning

confidence: 99%

Plasma flow suppression by the linear helical mirror system

et al. 2022

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The paper presents experimental results from the SMOLA device that is the first facility with a helical mirror section of the magnetic system. This device was built in the Budker Institute of Nuclear Physics for the verification of the helical mirror confinement idea that is the technique of an 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 the increase in plasma density in the entrance trap by a factor of 1.6 in the helical configuration. The integral axial flux from the transport section drops severalfold. The effective mirror ratio of the helical section was $R_{eff} > 10$ . Particle flux returning by the helical mirror section towards the confinement zone was observed. At high corrugation ratios, the axial flux direction is different at the magnetic axis and in the periphery of the plasma in the helical section. All axial fluxes scale linearly with the plasma density, even if the ion mean free path is comparable to the total length of the helical section. Good agreement of the experimental results with theoretical predictions is found.

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“…The presence of the axial plasma flow suppression was already demonstrated in the first experiments (Sudnikov et al . 2019) with an incomplete configuration of subsystems of the device.…”

Section: Introductionmentioning

confidence: 99%

Long-pulse plasma source for SMOLA helical mirror

et al. 2021

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A plasma gun for forming a plasma stream in the open magnetic mirror trap with additional helicoidal field SMOLA is described. The plasma gun is an axisymmetric system with a planar circular hot cathode based on lanthanum hexaboride and a hollow copper anode. The two planar coils are located around the plasma source and create a magnetic field of up to 200 mT. The magnetic field forms the magnetron configuration of the discharge and provides a radial electric insulation. The source typically operates with a discharge current of up to 350 A in hydrogen. Plasma parameters in the SMOLA device are Ti ~ 5 eV, Te ~ 5–40 eV and ni ~ (0.1–1) × 1019 m−3. Helium plasma can also be created. The plasma properties depend on the whole group of initial technical parameters: the cathode temperature, the feeding gas flow, the anode-cathode supply voltage and the magnitude of the cathode magnetic insulation.

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First Experimental Campaign on SMOLA Helical Mirror

Cited by 15 publications

References 16 publications

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

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

Plasma flow suppression by the linear helical mirror system

Long-pulse plasma source for SMOLA helical mirror

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