Fuel removal from tile gaps with oxygen discharges: reactivity of neutrals

被引：8

作者：

Schwarz-Selinger, Thomas ^{[1
]}

von Toussaint, Udo ^{[1
]}

Hopf, Christian ^{[1
]}

Jacob, Wolfgang ^{[1
]}

机构：

[1] Max Planck Inst Plasma Phys, EURATOM Assoc, D-85748 Garching, Germany

来源：

PHYSICA SCRIPTA | 2009年 / T138卷

关键词：

SURFACE LOSS PROBABILITIES; PLASMA-FACING COMPONENTS; DEUTERATED CARBON-FILMS; HYDROCARBON LAYERS; FUSION DEVICES; ASDEX UPGRADE; EROSION; JET; ELLIPSOMETRY; DEPOSITION;

D O I：

10.1088/0031-8949/2009/T138/014009

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Carbon removal in the so-called remote areas, where no energetic species can reach the surface, is investigated with low-temperature glow discharges in pure oxygen. Plasma-deposited amorphous hydrogenated carbon thin films are used as a model system for redeposited films. Erosion measurements are performed on flat substrates as well as on two different three-dimensional (3D) test structures. One design consists of 19mm deep gaps with widths ranging from 0.5 to 4mm to simulate ITER tile gaps. A second design consists of a flat box-like structure where particles can enter only through a narrow slit. Measurements are performed for substrate temperatures ranging from 290 to 580 K. Erosion rates follow an Arrhenius-type dependence on substrate temperature with an effective activation energy of 0.25 eV. While at room temperature the surface loss probability of the dominant eroding species is 50% it becomes smaller at elevated temperatures. At elevated temperatures, the films are not only removed faster but simultaneously erosion penetrates deeper into the gaps.

引用

页数：8

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