Theoretical simulation of the closed currents near non-uniformly strongly heated surface of tungsten due to thermo-emf

Standard

Theoretical simulation of the closed currents near non-uniformly strongly heated surface of tungsten due to thermo-emf. / Popov, V. A.; Arakcheev, A. S.; Kandaurov, I. V. et al.

In: Physics of Plasmas, Vol. 29, No. 3, 033503, 01.03.2022.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{89090088786046e9be90c6f403e35ef4,

title = "Theoretical simulation of the closed currents near non-uniformly strongly heated surface of tungsten due to thermo-emf",

abstract = "A problem of surface melting under the impact of plasmas is one of the most important in the development of future magnetic confinement fusion reactors. The expected high heat loads can lead to melting of tungsten chosen as the material of a divertor and the first wall of ITER. The tungsten melt can move under the action of forces and quickly deform a surface. This article shows that at high temperatures, a tungsten vapor can be considered as a conductive material with conductivity high enough to be taken into account during simulation of current through a sample. We describe the mechanism of current generation by the thermo-emf due to non-uniform heating of the vapor/condensed substance interface without external sources of charges. Even without direct contact with the external plasma, the density of this current is high enough to cause noticeable movement of the melt in an external magnetic field. Simulation shows that the melt moving observed at BETA may be caused not by a current of an electron beam but by non-uniformity of heating and can be reproduced by any other similar heat source in the external magnetic field.",

author = "Popov, {V. A.} and Arakcheev, {A. S.} and Kandaurov, {I. V.} and Kasatov, {A. A.} and Kurkuchekov, {V. V.} and Trunev, {Yu A.} and Vasilyev, {A. A.} and Vyacheslavov, {L. N.}",

note = "Funding Information: This work was supported by the Russian Foundation for Basic Research and Government of the Novosibirsk region (Project No. 20–48-540029). Publisher Copyright: {\textcopyright} 2022 Author(s).",

year = "2022",

month = mar,

day = "1",

doi = "10.1063/5.0078087",

language = "English",

volume = "29",

journal = "Physics of Plasmas",

issn = "1070-664X",

publisher = "American Institute of Physics",

number = "3",

}

RIS

TY - JOUR

T1 - Theoretical simulation of the closed currents near non-uniformly strongly heated surface of tungsten due to thermo-emf

AU - Popov, V. A.

AU - Arakcheev, A. S.

AU - Kandaurov, I. V.

AU - Kasatov, A. A.

AU - Kurkuchekov, V. V.

AU - Trunev, Yu A.

AU - Vasilyev, A. A.

AU - Vyacheslavov, L. N.

N1 - Funding Information: This work was supported by the Russian Foundation for Basic Research and Government of the Novosibirsk region (Project No. 20–48-540029). Publisher Copyright: © 2022 Author(s).

PY - 2022/3/1

Y1 - 2022/3/1

N2 - A problem of surface melting under the impact of plasmas is one of the most important in the development of future magnetic confinement fusion reactors. The expected high heat loads can lead to melting of tungsten chosen as the material of a divertor and the first wall of ITER. The tungsten melt can move under the action of forces and quickly deform a surface. This article shows that at high temperatures, a tungsten vapor can be considered as a conductive material with conductivity high enough to be taken into account during simulation of current through a sample. We describe the mechanism of current generation by the thermo-emf due to non-uniform heating of the vapor/condensed substance interface without external sources of charges. Even without direct contact with the external plasma, the density of this current is high enough to cause noticeable movement of the melt in an external magnetic field. Simulation shows that the melt moving observed at BETA may be caused not by a current of an electron beam but by non-uniformity of heating and can be reproduced by any other similar heat source in the external magnetic field.

AB - A problem of surface melting under the impact of plasmas is one of the most important in the development of future magnetic confinement fusion reactors. The expected high heat loads can lead to melting of tungsten chosen as the material of a divertor and the first wall of ITER. The tungsten melt can move under the action of forces and quickly deform a surface. This article shows that at high temperatures, a tungsten vapor can be considered as a conductive material with conductivity high enough to be taken into account during simulation of current through a sample. We describe the mechanism of current generation by the thermo-emf due to non-uniform heating of the vapor/condensed substance interface without external sources of charges. Even without direct contact with the external plasma, the density of this current is high enough to cause noticeable movement of the melt in an external magnetic field. Simulation shows that the melt moving observed at BETA may be caused not by a current of an electron beam but by non-uniformity of heating and can be reproduced by any other similar heat source in the external magnetic field.

UR - http://www.scopus.com/inward/record.url?scp=85126046741&partnerID=8YFLogxK

U2 - 10.1063/5.0078087

DO - 10.1063/5.0078087

M3 - Article

AN - SCOPUS:85126046741

VL - 29

JO - Physics of Plasmas

JF - Physics of Plasmas

SN - 1070-664X

IS - 3

M1 - 033503

ER -

ID: 35665215