Carbon — Beryllium Interaction and Its Possible Consequences

Kolbasov, B.N.; Davydov, V. A.; Kholopova, O.V.

doi:10.21517/0202-3822-2011-34-1-48-54

Cited by 1 publication

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References 8 publications

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“…In addition, the presence of free dust grains and film fragments leads to a risk of violation of the safe operation of a tokamak reactor [3] for several reasons. First, these grains contain radioac tive species (tritium, radioactive isotopes of heavy metals).…”

Section: Introductionmentioning

confidence: 99%

Mobilization of dust and exfoliation of erosion product films in tokamaks

Martynenko

Nagel

2012

Plasma Phys. Rep.

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The mobilization of dust (i.e., detachment and removal of dust grains from a substrate) and the exfoliation of a film of erosion products in tokamaks have been studied theoretically. The following mecha nisms of dust mobilization have been taken into account: (i) sharp heating (thermal shock) as a result of, e.g., plasma disruption and edge instabilities; (ii) substrate vibrations; and (iii) gas and plasma flow (wind) action. The most effective mobilization takes place under the action of sharp heating. Power fluxes that are charac teristic of edge instabilities can mobilize dust grains with dimensions within or even greater than 0.1-1 µm. The velocities of detached grains reach m/s for heavy grains and up to v ~ 300 m/s for the light ones. Conditions favoring the exfoliation of a film of erosion products are determined. It is shown that exfoliation under the action of edge instabilities can take place at a film thickness of h > 1 µm. Under the action of ther mal shock induced stresses, the exfoliated film flakes with a size ranging from fractions of a millimeter to sev eral centimeters break into pieces.

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Section: Introductionmentioning

confidence: 99%