High temperature outgassing tests on materials used in the DIII-D tokamak

Autor:	M. J. Hansink, K. L. Holtrop
Rok vydání:	2006
Předmět:	Work (thermodynamics) Materials science Tokamak Magnetic fusion DIII-D Nuclear engineering chemistry.chemical_element Surfaces and Interfaces Plasma Condensed Matter Physics Surfaces Coatings and Films law.invention Outgassing chemistry Impurity Aluminium law
Zdroj:	Journal of Vacuum Science & Technology A: Vacuum, Surfaces, and Films. 24:1572-1577
ISSN:	1520-8559 0734-2101
Popis:	This article is a continuation of previous work on determining the outgassing characteristics of materials used in the DIII-D magnetic fusion tokamak [K. L. Holtrop, J. Vac. Sci. Technol. A 17, 2064 (1999)]. Achievement of high performance plasma discharges in the DIII-D tokamak requires careful control of impurity levels. Among the techniques used to control impurities are routine bakes of the vacuum vessel to an average temperature of 350°C. Materials used in DIII-D must release only very small amounts of impurities (below 2×10−6mole) at this temperature that could be transferred to the first wall materials and later contaminate plasma discharges. To better study the behavior of materials proposed for use in DIII-D at elevated temperatures, the initial outgassing test chamber was improved to include an independent heating control of the sample and a simple load lock chamber. The goal was to determine not only the total degassing rate of the material during baking, but to also determine the gas species c...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::bb8a9f2a8cee76bec60026e5210a6cd2 https://doi.org/10.1116/1.2178363 Zobrazit plný text záznamu