Bohm like Transport in a Toroidal Magnetoplasma in the Absence of Longitudinal Current

Riccardi, C.; Chiodini, G.; Bevilacqua, C.; Barni, R; Fredriksen, Åshild; Fontanesi, M.

doi:10.1238/physica.topical.084a00103

Cited by 2 publications

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“…In this paper, a computational model has been developed to model the primary electron emission from a hot filament cathode in a toroidal magnetic field without rotational transform. Plasma embedded in a pure toroidal magnetic field presents an interesting model for the study of various waves and instabilities occurring in laboratory and space plasmas [14][15][16][17][18][19][20][21][22][23][24]. A number of devices have been constructed worldwide for these studies.…”

Section: Introductionmentioning

confidence: 99%

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Inhomogeneous electron emission from a hot filament in a toroidal magnetic field

Kaur¹,

Mattoo²

2008

Plasma Sources Sci. Technol.

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Experimental observations on toroidal discharges, with a thermionically electron emitting source, have established that discharge current depends upon the toroidal magnetic field. It is shown that discharge current saturates at a value of toroidal magnetic field that is much less than the surface value self-magnetic field of the filament. This paper presents a model for electron emission from a hot filament in the presence of an externally imposed toroidal field and electric field for acceleration. Particle trajectories in the vicinity of the filament with varying velocity components at different spatial locations and magnetic fields have been simulated. It is shown that escape or trapping of electrons emitted by the filament is strongly dependent on where the electron originated and its velocity. Consequently, escaping electrons responsible for ionization are inhomogeneously emitted. The degree of inhomogeneity is reduced as the magnetic field increases, leading to saturation. We have further examined the effect of reducing the filament diameter on the power requirement and operating toroidal magnetic field.

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Section: Introductionmentioning

confidence: 99%

“…A number of devices have been constructed worldwide for these studies. In many of these devices [14][15][16][17][18][19][20] the plasma is produced using a hot filament cathode. The thermionically emitted electrons are accelerated through a sheath region to excite and ionize the background neutrals.…”

Section: Introductionmentioning

confidence: 99%