Poloidal plasma rotation and its effect on fluctuations in a toroidal plasma

Jain, K. K.

doi:10.1088/0029-5515/36/12/i06

Cited by 8 publications

(4 citation statements)

References 32 publications

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“…The observed value of charge density shows that only a small amount of residual space charge exists that is responsible for the creation of a charge cylinder. This electric field functions much in the similar fashion as in biased electrode experiments of tokamaks [16,17] and biased ring experiment in BETA [18,19]. The major difference between the excited electric field by the filament, aiding in the plasma equilibrium in BETA, and enhanced confinement mode experiments on tokamak and BETA is that, in the latter electric fields are excited from the boundary while in the present case it is excited from the core of plasma.…”

Section: Discussionsupporting

confidence: 57%

Self Consistently Generated Charge Cylinder in BETA Device

Kaur¹,

Sree²,

Mattoo³

2012

JMP

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This paper presents a study on near cathode space charge region in BETA (Basic Experiments in Toroidal Assembly), a toroidal plasma device with purely toroidal magnetic field. A charge cylinder has been found to be embedded in the plasma center corresponding to the hot filament cathode location in poloidal cross section. This charge cylinder has been created by the primary electrons emitted from the filament surface, which in turn, leads to the formation of a potential well in the core plasma. We have proposed a model, which shows that a tiny fraction of injected energetic electrons is sufficient to sustain the observed potential well. We have examined the equilibrium of the charge cylinder in poloidal cross-section and found that it exhibits equilibrium configuration by forming circulation pattern of primary electrons. The circulation pattern is formed by vertical drift due to toroidal magnetic field and self-consistent poloidal <i>E×B</i> drift. We have concluded that the self-consistency is in adjusting the poloidal drift to the vertical drift of the trapped primary electrons

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Section: Discussionsupporting

confidence: 57%

Self Consistently Generated Charge Cylinder in BETA Device

Kaur¹,

Sree²,

Mattoo³

2012

JMP

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“…Experiments in the BETA device 21 have reported the formation of a radial electric field layer when a positively biased electrode is inserted in the edge of the magnetized plasma. Experiments in the BETA device 21 have reported the formation of a radial electric field layer when a positively biased electrode is inserted in the edge of the magnetized plasma.…”

Section: Discussionmentioning

confidence: 99%

Direct observation of a cross-field current-carrying plasma rotating around an unstable magnetized plasma column

2009

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The low-frequency instability of a magnetized plasma column and the existence of a rotating peripheral plasma are shown to be correlated with a radial cross-field electron current. The direct observation of the rotating plasma is obtained using an ultrafast intensified camera. The ionizing electrons injected along the axis of the plasma column contribute to the accumulation of negative charges when the axial collector is at floating potential. The required neutrality leads to the continuous radial expulsion of both energetic and thermal electrons and to the formation of a rotating plasma channel.

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“…BETA has also been used for understanding the poloidal plasma rotation induced by electrode biasing and its effect on fluctuations and confinement [25]. Poloidal plasma rotation and, concomitantly, significant reduction in the fluctuation level are observed.…”

Section: Toroidal Plasma Experiments In Betamentioning

confidence: 99%

From Electrojet to ITER: India's Journey in Experimental Plasma Physics

John¹

2017

ujpa

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India has an international presence in PlasmaPhysics and its diverse applications such as thermonuclear fusion, material processing, strategic and environmental applications and plasma devices. From a modest start in the early 1970s, we have made great strides in the field of experimental plasma physics. Capacity building in techniques relevant to plasma production, manipulation and parameter control, pulsed power, creation of magnetic fields of complex geometries, clean vacuum and pumping systems, development and deployment of diagnostics to enable understanding of fundamental processes in plasmas and computer simulation to model plasma phenomena have been truly remarkable. Parallel to this, a community of physicists, engineers and computer experts has grown and matured. Funding mechanisms and financial support essential to broad base the research and development activity by drawing in Universities and education institutes have been nucleated. It is through these activities that the human resource and technology development essential to sustain India's ambitious forays into magnetic confinement fusion and industrial and strategic plasma applications has taken place.

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Poloidal plasma rotation and its effect on fluctuations in a toroidal plasma

Cited by 8 publications

References 32 publications

Self Consistently Generated Charge Cylinder in BETA Device

Self Consistently Generated Charge Cylinder in BETA Device

Direct observation of a cross-field current-carrying plasma rotating around an unstable magnetized plasma column

From Electrojet to ITER: India's Journey in Experimental Plasma Physics

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