Heat flows through plasma sheaths

Takamura, S.; Ye, M. Y.; Kuwabara, T.; Ohno, Noriyasu

doi:10.1063/1.872888

Cited by 47 publications

(37 citation statements)

References 26 publications

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“…[1][2][3][4] However, many laboratory and space plasma boundaries are emissive, and the electrons emitted via process of thermionic emission, photoelectron emission and secondary electron emission (SEE) influence sheath structure dramatically, and consequently the near-wall heat flux and bulk plasma. [5][6][7][8] Therefore, understanding the characteristics of sheath near emissive surfaces is crucial for many plasma related applications and phenomena, e.g. emissive probe, 9,10 plasma thruster, 11,12 fusion reactor, 13,14 charging of spacecraft, 15,16 and dust levitation near lunar surface.…”

Section: Introductionmentioning

confidence: 99%

Effect of total emitted electron velocity distribution function on the plasma sheath near a floating wall

Qing

Zhou

2017

AIP Advances

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Electrons emitted from a solid surface can noticeably affect characteristics of plasma sheath surrounding that surface by modifying current balance at wall, charge separation in sheath region and Bohm criterion at sheath edge. We establish a static sheath model with kinetic electrons and cold ions to emphasize the effect of different total emitted electron velocity distribution functions (EEVDFs) on classic sheath solution and its structure transition. Four total EEVDFs with same average energy are considered separately. It is found that total EEVDFs influence the sheath solution and the threshold of total electron emission coefficient (EEC) for classic sheath dramatically, and can cause no solution for critical space-charge limited (SCL) sheath. These results indicate that, as EEC increases from zero gradually, the sheath will not transit from classic sheath to SCL sheath structure for some special total EEVDFs.

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Section: Introductionmentioning

confidence: 99%

Effect of total emitted electron velocity distribution function on the plasma sheath near a floating wall

Qing

Zhou

2017

AIP Advances

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“…3b and 4b), that the electron emission of graphite is obviously considerably lower than of LaB 6 , due to the higher work function of the former material. On the other hand with a stronger laser the emission from graphite can be further increased to values comparable to that of LaB 6 . …”

Section: Resultsmentioning

confidence: 87%

“…On the other hand, graphite can be heated much higher than tungsten so that with sufficient laser heating power also a very high electron emission can be achieved. With the sublimation temperature of graphite being around 4000 K, it could be heated to about 3600 K, in which case the emission current density is around 1.2×10 6 A/m 2 .…”

Section: Experimental Considerations and Resultsmentioning

confidence: 99%

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Results of direct measurements of the plasma potential using a laser-heated emissive probe

et al. 2006

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The reliable diagnostics of the plasma potential is one of the most important challenges in context with the production, control and confinement of plasma. Emissive probes are readily available as direct diagnostic tools for the plasma potential with a good temporal and spatial resolution in many plasmas, even up to middle-sized fusion experiments. We present the results of investigations on the heating of lanthanum hexaboride and graphite with an infrared diode laser and on the development of a laser-heated emissive probe. Such a probe has a higher electron emission, much longer life time and better time response than a conventional emissive wire probe. We have observed that from both materials electron emission current can be achieved sufficiently strong even for dense laboratory and experimental fusion plasmas.

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“…Recently, it has become significantly important for diverter physics in magnetic fusion devices. There are several key factors which determine the energy transmission through the sheath [11]. An interaction between the plasma and a solid wall, and the formation of a boundary layer around it are almost as old as plasma physics itself.…”

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confidence: 99%

The Study of Kinetic Energy of Ion and Sheath Thickness in Magnetized Plasma Sheath

Chalise¹,

Khanal²

2015

JMSE-A

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Abstract:In all plasma applications, sheath formed in front of a material wall is responsible for the flow of particles and energy towards the wall. The kinetic energy of ion and sheath thickness in magnetized plasma sheath region has been numerically investigated by using a kinetic trajectory simulation model for different magnetic field and its obliqueness. It has been revealed that, the kinetic energy of ions reaching the material wall can be controlled by the strength of applied magnetic field and its orientation. Kinetic energy of ion increases when we move towards the wall, whereas the kinetic energy of electrons decreases as expected, which becomes prominent as the strength and obliqueness of the field increase. It is found that by increasing the magnetic field strength, there is an increase in the ion energy and a decrease in the sheath thickness.

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Heat flows through plasma sheaths

Cited by 47 publications

References 26 publications

Effect of total emitted electron velocity distribution function on the plasma sheath near a floating wall

Effect of total emitted electron velocity distribution function on the plasma sheath near a floating wall

Results of direct measurements of the plasma potential using a laser-heated emissive probe

The Study of Kinetic Energy of Ion and Sheath Thickness in Magnetized Plasma Sheath

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