Mixed Material Plasma-Surface Interactions in ITER: Recent Results from the PISCES Group

Journal Article · Thu May 20 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3447995· OSTI ID:21362068

Tynan, George R; Baldwin, Matthew; Doerner, Russell; Hollmann, Eric; Nishijima, Daisuke; Umstadter, Karl; Yu, Jonathan ^[1]

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1. Center for Energy Research 460 EBU II MC 0417 UCSD, 9500 Gilman Drive La Jolla CA 92093-0417 (United States)

This paper summarizes recent PISCES studies focused on the effects associated with mixed species plasmas that are similar in composition to what one might expect in ITER. Formation of nanometer scale whiskerlike features occurs in W surfaces exposed to pure He and mixed D/He plasmas and appears to be associated with the formation of He nanometer-scaled bubbles in the W surface. Studies of Be-W alloy formation in Be-seeded D plasmas suggest that this process may be important in ITER all metal wall operational scenarios. Studies also suggest that BeD formation via chemical sputtering of Be walls may be an important first wall erosion mechanism. D retention in ITER mixed materials has also been studied. The D release behavior from beryllium co-deposits does not appear to be a diffusion dominated process, but instead is consistent with thermal release from a number of variable trapping energy sites. As a result, the amount of tritium remaining in codeposits in ITER after baking will be determined by the maximum temperature achieved, rather than by the duration of the baking cycle.

• OSTI ID: 21362068
• Journal Information: AIP Conference Proceedings, Vol. 1237, Issue 1; Conference: 3. ITER international summer school, Aix-en-Provence (France), 22-26 Jun 2009; Other Information: DOI: 10.1063/1.3447995; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
36 MATERIALS SCIENCE
ALLOYS
BERYLLIUM
CRYSTALS
EROSION
FIRST WALL
ITER TOKAMAK
PLASMA
PLASMA SIMULATION
SPUTTERING
TRANSMISSION ELECTRON MICROSCOPY
TRITIUM
ALKALINE EARTH METALS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CLOSED PLASMA DEVICES
ELECTRON MICROSCOPY
ELEMENTS
HYDROGEN ISOTOPES
ISOTOPES
LIGHT NUCLEI
METALS
MICROSCOPY
NUCLEI
ODD-EVEN NUCLEI
RADIOISOTOPES
SIMULATION
THERMONUCLEAR DEVICES
THERMONUCLEAR REACTOR WALLS
THERMONUCLEAR REACTORS
TOKAMAK DEVICES
TOKAMAK TYPE REACTORS
YEARS LIVING RADIOISOTOPES