Experiments to study the confinement of a target plasma in a magnetic trap with inverse plugs and circular multipole walls

A plasma target for highly efficient neutralization of powerful negative ion beams is considered. The plasma is confined within a magnetic trap with multipole magnetic walls. It is proposed to use inverse magnetic mirrors to limit plasma outflow through the inlet and outlet holes in the trap. Using the particle-in-cell method, mathematical simulation of plasma dynamics in the trap has been performed. The estimates of plasma distribution and particle confinement efficiency in the region of the magnetic mirrors has been obtained. Simulation results were compared with experimental data.

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“…This means that only particles with high transverse energy escape. A similar result was obtained experimentally by Dimov & Emelev (2014).…”

Section: Results Of the Simulationsupporting

confidence: 91%

Mathematical and experimental simulation of a cylindrical plasma target trap with inverse magnetic mirrors

et al. 2015

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“…The stepwise decrease of the density caused by summation of magnetic field of the inverse mirror with the total magnetic field. A similar step drop of plasma density along the axis in each inverted tube was found in experiment [12]. Figure 4 shows the change of the plasma density at the end of the trap (Z = 650) over time.…”

Section: Simulation Resultssupporting

confidence: 53%

“…Figure 4 shows the change of the plasma density at the end of the trap (Z = 650) over time. For the considered region the main plasma stream is concentrated in the central part near the axis, as it has been found in [12]. The plasma flow through the end holes of the trap is substantially less than on the wall.…”

Section: Simulation Resultsmentioning

confidence: 49%

Computer simulation of cylindrical plasma target trap with inverse magnetic mirrors

Berendeev¹,

Dudnikova²,

Efimova³

et al. 2016

AIP Conference Proceedings

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Abstract. Computer simulation of dynamic of plasma target for highly efficient neutralization of powerful negative ion beams is considered. The plasma is confined within a magnetic trap with multipole magnetic walls. Mathematical model is based on the Boltzmann equation for the distribution functions for ions and electrons and system of the Maxwell's equations for the selfconsistent electromagnetic fields. The combination of the modified PIC-method in the cylindrical R-Z coordinates and the MonteCarlo methods is used to solve these equations. The complex nature of the processes studied, and also the need of calculation of trajectories of billions of particles required the use scalable parallel algorithm. The use of modern supercomputers has allowed to calculate plasma dynamics, to determine plasma streams both on the walls of the trap and through end holes.

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“…There are results of preliminary experiments on model of the small size. It is shown that the inverse magnetic field applied in our trap in end openings effectively limits a plasma flow through such openings [4].…”

Section: Discussionmentioning

confidence: 98%

“…This magnetic field is directed opposite in relation to a magnetic field in the central part of the corresponding half of the trap. This inverse magnetic field has to limit leakage of plasma particles in end apertures due to conservation of generalized angular momentum of particles in the axisymmetric magnetic field [3,4].…”

Section: Figurementioning

confidence: 99%

A plasma target for neutralization of the negative ion beam

Dimov¹,

Emelev²,

Ivanov³

2016

AIP Conference Proceedings

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Abstract.The results of the experimental study of build-up and confinement of low-temperature plasma target for neutralization of high energy negative ion beam are presented in the paper. The cylindrical vacuum chamber of the plasma target is 1.2 m long and 0.2 m in diameter. The axisymmetric multicusp magnetic field is formed at the periphery of the target chamber by using an array of the permanent NdFeB magnets, which are placed closely on the thin chamber walls. The target chamber is ended by the two diaphragms with 0.1m diameter apertures for the negative ion beam passing through. For reduction of the plasma losses through the ends, the inverse magnetic field are formed in the apertures .The plasma is produced in the target by ionization of the working gas by electrons, which emitted by six plane LaB 6 cathodes, which are placed uniformly over azimuth at the center of the plasma target. The discharge duration is set to 1 s. In short pulses at 300 kW power, the hydrogen plasma with density is produced. Spatial profiles of the plasma parameters in the target were measured.

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Experiments to study the confinement of a target plasma in a magnetic trap with inverse plugs and circular multipole walls

Cited by 6 publications

References 4 publications

Mathematical and experimental simulation of a cylindrical plasma target trap with inverse magnetic mirrors

Mathematical and experimental simulation of a cylindrical plasma target trap with inverse magnetic mirrors

Computer simulation of cylindrical plasma target trap with inverse magnetic mirrors

A plasma target for neutralization of the negative ion beam

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