Formation of a compact toroid for enhanced efficiency

Mozgovoy, A. G.; Romadanov, Ivan; Ryzhkov, Sergei V.

doi:10.1063/1.4863452

Cited by 16 publications

(7 citation statements)

References 19 publications

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“…Because of its high beta nature and simply-connected geometry, sustainment of FRC had not been realized because of the limitation of additional heating and current drive [4]. The FRC, therefore, has been studied mostly for the formation technique of high-density magnetized plasmoids as, for example, the target of magnetized target fusion [5] and formation of highcurret and high-flux magnetized plasmoid [6]. Recently, high confinement performance of FRCs have been achieved on a C-2/C-2U device via collisional-merging; that is, the kinetic energy of translation is larger than the thermal and magnetic energy of the plasmoids being merged, process with large orbit high energy ions fed by neutral beam injection [7].…”

Section: Introductionmentioning

confidence: 99%

Collisional merging formation of a field-reversed configuration in the FAT-CM device

et al. 2019

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Collisional merging formation of field-reversed configurations (FRCs) at super Alfvénic velocity have been successfully initiated in the FAT-CM device at Nihon University. It is experimentally evidenced that the quiescent FRC profile is formed in a self-organizational manner after distructive disturbances by the super Alfvénic collision of two translated magnetized plasmoids. A drastic increase of the excluded flux compared to the field-reversed theta-pinch formation section has also been observed. This formation process has an important role in realizing an FRC based high-beta reactor core to capture high-energy beam ions, and it has been clearly observed by magnetic diagnostics of excluded flux and internal probe array. The experimental results are compared with two-dimensional magnetohydrodynamic (MHD) simulation results computed for the typical conditions of the FAT-CM experiments. Collisional merging of the two separately translated FRCs causes a conversion of the kinetic energy to mostly thermal ion energy, which contrasts with the spheromak merging dominated by magnetic energy in an MHD manner, resulting in an increase of the ion pressure and polodal flux that drastically expands the FRC volume.

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Section: Introductionmentioning

confidence: 99%

Collisional merging formation of a field-reversed configuration in the FAT-CM device

et al. 2019

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“…The effect was significant -the level of the captured flow exceeded 70%. Compression began to appear and the magnetic field intensified in the center of the chamber [5]. The third idea -it was decided to abandon the inductive storage in the form of a solenoid and switch to a flat inductance in the form of an Archimedes spiral.…”

Section: Description Of the Methods And Experimentsmentioning

confidence: 99%

“…When two FRC collide, their magnetic field lines reconnect, which is accompanied by plasma heating and a flash of soft X-ray radiation with a duration of up to 1 μs. For registration, a diamond semiconductor detector (PPD-PCD) [5] with an Al filter 5 μm thick was used, and the pulse of "all" radiation, starting from visible light, was well felt by the MP-38 transistor crystal. The duration of such radiation turned out to be about 15 μs.…”

Section: Description Of the Methods And Experimentsmentioning

confidence: 99%

FRC collider

Mozgovoy¹

2022

8th International Congress on Energy Fluxes and Radiation Effects

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A method for the formation of a compact torus (CT or FRC) – a closed current loop in plasma – using an inductive energy storage device is proposed. This method has shown a high efficiency of magnetic energy conversion of the accumulator. Two compact tori accelerated towards each other, at the point of collision, gave a plasma temperature of more than 1 keV and a duration of soft X-ray radiation of about one microsecond, which is three orders of magnitude longer than the duration of such radiation at the Z-machine facility, USA.

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“…In the WT state, the minimum energy equilibrium is force-free (∇P = J × B = 0), and the current is along the magnetic field. In some experiments, an additional toroidal magnetic field is used to increase the plasma current to maintain the original CT magnetic field [16].…”

Section: Introductionmentioning

confidence: 99%

Theory and simulation of the force-free equilibria in the EAST-CTI

Huang

Kong

Xia

et al. 2023

Plasma Phys. Control. Fusion

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Compact torus injection (CTI) is a novel approach to fueling the core of a fusion reactor. In this paper, the force-free equilibrium based on the EAST-CTI is calculated. It is found that the α, which is proportional to the ratio of the toroidal current to the toroidal magnetic field, plays a key role for the force-free equilibrium. When it is smaller than the eigenvalue, the open poloidal magnetic flux decreases while the magnetic field strength increases as its value increases. However, once α equals the eigenvalue, the amplitude of the magnetic field tends to infinity and the boundary magnetic field is tangential to the wall. In addition, in this work we found that the eigenvalue is mainly determined by the width of the formation region, enlarging the width will significantly reduce the eigenvalue and further affecting the CT formation. Another interesting phenomenon in this work is that the poloidal magnetic field plays a hindering role in the formation of CT, and theoretically, CT is difficult to detach from the forming region when α'(α^'~J_p/B_p) is less than the threshold α_c. In experiments, we show that a discharge with α'<α_c leads to an increased delay between the onset of the current in the acceleration and formation regions. These findings provide some guidance for the carrying out of the experiments and future modifications of the device.

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Formation of a compact toroid for enhanced efficiency

Cited by 16 publications

References 19 publications

Collisional merging formation of a field-reversed configuration in the FAT-CM device

Collisional merging formation of a field-reversed configuration in the FAT-CM device

FRC collider

Theory and simulation of the force-free equilibria in the EAST-CTI

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