Migration of tungsten dust in tokamaks: role of dust-wall collisions

被引：56

作者：

Ratynskaia, S. ^{[1
]}

Vignitchouk, L. ^{[1
]}

Tolias, P. ^{[1
]}

Bykov, I. ^{[2
]}

Bergsaker, H. ^{[2
]}

Litnovsky, A. ^{[3
]}

den Harder, N.

Lazzaro, E. ^{[4
]}

机构：

[1] Royal Inst Technol KTH, Div Space & Plasma Phys, Assoc EURATOM VR, Stockholm, Sweden

[2] Royal Inst Technol KTH, Div Fus Plasma Phys, Assoc EURATOM VR, Stockholm, Sweden

[3] Forschungszentrum Julich, EURATOM Assoc, Inst Energieforsch Plasmaphys, D-52425 Julich, Germany

[4] CNR, ENEA, EURATOM Assoc, Ist Fis Plasma, I-20133 Milan, Italy

来源：

NUCLEAR FUSION | 2013年 / 53卷 / 12期

基金：

瑞典研究理事会;

关键词：

THEORETICAL-MODEL; ADHESION; CONTACT; IMPACT; RESTITUTION; PARTICLES; COEFFICIENT; TRANSPORT; BEHAVIOR; SPHERES;

D O I：

10.1088/0029-5515/53/12/123002

中图分类号：

O35 [流体力学]; O53 [等离子体物理学];

学科分类号：

070204 ; 080103 ; 080704 ;

摘要：

The modelling of a controlled tungsten dust injection experiment in TEXTOR by the dust dynamics code MIGRAINe is reported. The code, in addition to the standard dust-plasma interaction processes, also encompasses major mechanical aspects of dust-surface collisions. The use of analytical expressions for the restitution coefficients as functions of the dust radius and impact velocity allows us to account for the sticking and rebound phenomena that define which parts of the dust size distribution can migrate efficiently. The experiment provided unambiguous evidence of long-distance dust migration; artificially introduced tungsten dust particles were collected 120 degrees toroidally away from the injection point, but also a selectivity in the permissible size of transported grains was observed. The main experimental results are reproduced by modelling.

引用

页数：10

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