The impact of larger clusters formation C-5, C-6, C-7, C-8, C-9, and C-10 on the rates of carbon sublimation at elevated temperatures

Wu, C.H.; Mszanowski, U.; Martin, J.M.L.

doi:10.1016/S0022-3115(98)00310-9

Title

The impact of larger clusters formation C-5, C-6, C-7, C-8, C-9, and C-10 on the rates of carbon sublimation at elevated temperatures

Author

Wu, C.H.

Mszanowski, U.

Martin, J.M.L.

Abstract

To estimate the exact amount of the loss of material during the plasma disruption or during slow transients is critically important to design and component lifetime analysis. Over the years, a number of simulation experiments, using as heat sources electron beams, and laser beams on investigation of the influence of heat loads on the amount of sublimated carbon materials were carried out. In addition, computer programs and analytical techniques have been developed to estimate the toss of material from sublimation. For purpose of component life time assessment and comparison between theoretical calculation and experimental results, a detailed knowledge on sublimation behaviours of carbon materials at high temperature has therefore become indispensable. The sublimation behaviour of carbon at high temperature is a complex, because of the formation of stable carbon clusters. At present, in most of the literature, only the species C-1, C-2, C-3 and C-4 were taken into account to assess the sublimation rates. In this work, based on theoretical investigation, an analysis of the formation of larger clusters C-5, C-6, C-7, C-8, C-9 and C-10, as a function of temperature were performed and the total rate of sublimation of carbon materials was deduced. The consequence of this results on rates of carbon sublimation at elevated temperature is discussed. reserved.

Language

English

Source (journal)

Journal of nuclear materials. - Amsterdam, 1959, currens

Source (book)

8th International Conference on Fusion Reactor Materials (ICFRM-8), OCT 26-31, 1997, SENDAI, JAPAN

Publication

Amsterdam : Elsevier science bv , 1998

ISSN

0022-3115

DOI

10.1016/S0022-3115(98)00310-9