Further insight into the mechanism of hydrocarbon layer formation below the divertor of ASDEX Upgrade

被引：20

作者：

Mayer, M. ^{[1
]}

Rohde, V. ^{[1
]}

机构：

[1] EURATOM, Max Planck Inst Plasmaphys, D-85748 Garching, Germany

来源：

NUCLEAR FUSION | 2006年 / 46卷 / 11期

关键词：

D O I：

10.1088/0029-5515/46/11/005

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 surface loss probability of hydrocarbon radicals was measured below the roof baffle of the ASDEX Upgrade divertor using the cavity technique. Hydrocarbon layers are mainly formed by sticking of hydrocarbon radicals with high surface loss probabilities of about 0.2 and close to unity. In addition to sticking, re-erosion by atomic hydrogen plays an important role in layer formation. The temperature dependence of layer formation was measured with heated and cooled long term samples from 77 to 475 K. The layer growth rate is larger by a factor of about 40 at 77 K compared with room temperature, while it is lower by a factor of about 70 at 475 K than at room temperature due to enhanced re-erosion. Implications of the results for predictions of tritium retention in future fusion devices and hydrocarbon layer formation on mirror surfaces are discussed.

引用

页码：914 / 920

页数：7

共 31 条

[1] Differential cross-section of the D(3He, p)4He nuclear reaction and depth profiling of deuterium up to large depths [J].

Alimov, VK ;

Mayer, M ;

Roth, J .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 2005, 234 (03) :169-175

[2] Molecular dynamics calculation of carbon/hydrocarbon reflection coefficients on a hydrogenated graphite surface [J].

Alman, DA ;

Ruzic, DN .

JOURNAL OF NUCLEAR MATERIALS, 2003, 313 :182-186

[3] Erosion/deposition in JET during the period 1999-2001 [J].

Coad, JP ;

Andrew, P ;

Hole, DE ;

Lehto, S ;

Likonen, J ;

Matthews, GF ;

Rubel, M .

JOURNAL OF NUCLEAR MATERIALS, 2003, 313 :419-423

[4] Erosion/deposition issues at JET [J].

Coad, JP ;

Bekris, N ;

Elder, JD ;

Erents, SK ;

Hole, DE ;

Lawson, KD ;

Matthews, GF ;

Penzhorn, RD ;

Stangeby, PC .

JOURNAL OF NUCLEAR MATERIALS, 2001, 290 :224-230

[5] Modelling of deposition of hydrocarbon films underneath the divertor and in the pumping ducts of ITER [J].

Federici, G ;

Mayer, M ;

Strohmayer, G ;

Chuyanov, V ;

Day, C .

JOURNAL OF NUCLEAR MATERIALS, 2005, 337 (1-3) :40-44

[6] Key ITER plasma edge and plasma-material interaction issues [J].

Federici, G ;

Andrew, P ;

Barabaschi, P ;

Brooks, J ;

Doerner, R ;

Geier, A ;

Herrmann, A ;

Janeschitz, G ;

Krieger, K ;

Kukushkin, A ;

Loarte, A ;

Neu, R ;

Saibene, G ;

Shimada, M ;

Strohmayer, G ;

Sugihara, M .

JOURNAL OF NUCLEAR MATERIALS, 2003, 313 :11-22

[7] Assessment of erosion and tritium codeposition in ITER-FEAT [J].

Federici, G ;

Brooks, JN ;

Coster, DP ;

Janeschitz, G ;

Kukuskhin, A ;

Loarte, A ;

Pacher, HD ;

Stober, J ;

Wu, CH .

JOURNAL OF NUCLEAR MATERIALS, 2001, 290 :260-265

[8] In-vessel tritium retention and removal in ITER [J].

Federici, G ;

Anderl, RA ;

Andrew, P ;

Brooks, JN ;

Causey, RA ;

Coad, JP ;

Cowgill, D ;

Doerner, RP ;

Haasz, AA ;

Janeschitz, G ;

Jacob, W ;

Longhurst, GR ;

Nygren, R ;

Peacock, A ;

Pick, MA ;

Philipps, V ;

Roth, J ;

Skinner, CH ;

Wampler, WR .

JOURNAL OF NUCLEAR MATERIALS, 1999, 266 :14-29

[9] Redeposition of hydrocarbon layers in fusion devices [J].

Jacob, W .

JOURNAL OF NUCLEAR MATERIALS, 2005, 337 (1-3) :839-846

[10]

JACOB W, 2000, NATO SCI SERIES, V2, P331

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