Erosion and Deposition Mechanisms in Fusion Plasmas

Erosion and Deposition

An In-situ Technique to Measure Erosion and Deposition in Fusion Devices

Erosion or deposition of sub-micron layers of graphite or other materials can be measured by bombarding a sub-surface layer of “B or ‘Li with thermal neutrons and observing with a surface-barrier detector the energy loss of the prompt alphas or tritons produced. To demonstrate the feasibility of this technique. a (525Ok 250) A layer of boron and a (1.25 +0.05) pm layer of Li,B,O, were electron-...

Multidimensional Soil Erosion / Deposition

Inverse Braking Radiation and Resonance Absorption in Corona Plasmas of Inertial Confinement Fusion

Abstract: In this paper, combining the Maxwell equations with the electron balanceequation, we obtain the inverse braking radiation absorption coefficient in a laser fusioncorona plasma. For a fixed plasma temperature, variations of the absorption coefficientversus the penetration depth into the plasma are illustrated numerically for differentvalues of laser wavelength. ...

Overview of Erosion Mechanisms, Impurity Transport, and Deposition in Textor and Related Modeling

This paper gives an overview of the research activities at TEXTOR on impurity production, impurity transport through the plasma, and then deposition. First, laboratory experiments on chemical erosion by hydrogen and oxygen and radiation-enhanced sublimation are described, followed by the main part, which concentrates on the TEXTOR data of impurity release, impurity transport, and redeposition. ...