Divertor Thomson scattering (DTS) and laser-induced fluorescence (LIF) are both laser aided diagnostics well suited to combination with common probing and collecting optics that are the most sophisticated and expensive part of any ITER optical diagnostic system. The combination of DTS and LIF are used for simultaneous measurement of local electron (Te, ne), ion (Ti, nHeII) and atom (nHeI, nH(D,T)) parameters and provide basic information on rates of electron and ion processes to allow basic understanding of the physics of divertor plasma detachment. The measured parameters permit the calculation of rates of ionization and recombination using Te, ne, Ti, ni, nHeI and nH(D,T); emission intensity—Te, ne, ni, nHeI and nH(D,T); frictional force of the plasma flow due to collisions with neutrals—Ti, ni, T0, nHeI and nH(D,T) and pressure of the incoming plasma flow—Te, ne, Ti and ni. The paper discusses the benefits of DTS and LIF integration, suggests new approaches to the estimation of DTS capability, LIF implementation and possibilities for further diagnostic development.

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A t low vacancy concentrations in crystals it is possible to define an encounter of a given pair of atoms and a vacancy as the set of displacements of the pair of atoms caused by a randomly walking vacancy. The relative displacement probability of a pair of atoms caused by an encounter with a vacancy is calculated from random walk theory applied to the vacancy motion. The resulting displacement probability is used to calculate the high-frequency limit of the correlation functions relevant in nuclear spin relaxation by translational diffusion due to the vacancy mechanism in cubic crystals.