Thermo-oxidation of DIII-D codeposits on open surfaces and in simulated tile gaps

被引：8

作者：

Davis, J. W. ^{[1
]}

Tsui, C. K. ^{[1
]}

Chung, G. A. ^{[1
]}

Fitzpatrick, B. W. N. ^{[1
]}

Haasz, A. A. ^{[1
]}

机构：

[1] Univ Toronto, Inst Aerosp Studies, Toronto, ON M3H 5T6, Canada

来源：

JOURNAL OF NUCLEAR MATERIALS | 2011年 / 415卷 / 01期

关键词：

REMOVAL; DEPENDENCE; CARBON;

D O I：

10.1016/j.jnucmat.2010.11.019

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

This work extends previous thermo-oxidation studies [R. Ochoukov, A.A. Haasz, J.W. Davis, Phys. Scr. T124 (2006) 27; A.A. Haasz, C.K. Tsui, J.W. Davis, R. Ochoukov, Phys. Scr. T128 (2007) 551 of DIII-D codeposits to provide reference data prior to performing in situ thermo-oxidation in DIII-D. The present results confirm that codeposit removal by oxidation in dry air or a mixture of O-2-He gas is equally effective as in pure O-2, given equivalent O-2 partial pressures. We have also demonstrated that increasing the oxidation time to 48 h (compared with 2-8 h [R. Ochoukov, A.A. Haasz, J.W. Davis, Phys. Scr. T124 (2006) 27; A.A. Haasz, C.K. Tsui, J.W. Davis, R. Ochoukov, Phys. Scr. T128 (2007) 551) does not compensate for 'less severe' oxidation conditions of (i) low pressure' (0.021 kPa O-2 partial pressure) at 'high temperature' (623 K) and (ii) low temperature' (523 K) at 'high pressure' (17 kPa O-2 partial pressure). The new results also show that thermo-oxidation is equally effective in removing codeposits from open surfaces and from tile gaps accessible by narrow (similar to 1 mm) passageways, and have extended the range of the linear relationship between D removal rates and inherent D content. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：S789 / S792

页数：4

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