Preliminary neutronic assessments for the development of the VIS/IR diagnostic systems located in the ITER EPP

Palermo, Iole; Mota, F.; Ríos, Luis; Catalán, J.P.; Alonso, Javier; Ibarra, Á.

doi:10.1016/j.fusengdes.2015.08.014

Cited by 3 publications

(1 citation statement)

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“…The region in which the source of the impurity can be localized is determined by the optical scheme, which detects spontaneous emission, and the processes in the plasma. The optical system in the ITER diagnostic complex includes a panoramic spectrometer for the operation in the visible and near-IR spectral regions (VisIR [221,222]) with the inverse linear dispersion of at least 1 nm/mm. This is a sufficient resolution for the discussed methods.…”

Section: Localization Of Sources Of the Penetration Of Water Moleculesmentioning

confidence: 99%

Spectral Methods of Control of Impurities, Their Flows and Localization in an Equilibrium Low-Temperature Plasma of Low Pressure

2020

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The state-of-art of studies of processes involving small fractions of particles formed as a result of chemical transformations of the source gas or appearing from the outside as an impurity is discussed. Various high-sensitivity methods for measuring the low concentrations of particles are considered. The main focus is on spectral methods, both classical and laser ones. The main modern fields of the application of non-equilibrium plasma, features, and achievements of the diagnostic tools used in them are highlighted. The emphasis is on spectroscopic studies of plasma purity in the low-temperature near-wall layers of thermonuclear reactors. In this case, the issue of the penetration of water molecules into the plasma chamber from the cooling circuits is of particular importance. In view of the limited accessibility to the reactors, new remote versions of spectral emission methods are being developed that are focused on the diagnostics of the ITER near-wall plasma. A new method of multispectral optical actinometry is discussed, in which intermediate chemically unstable particles can play the role of actinometers. This broadens the range of possibilities for quantitative measurements of concentrations of particles of different kinds, and increases the sensitivity. Effective actinometric pairs were found for the objects under consideration, e.g., hydrogen and deuterium atoms. The schemes are worked out on laboratory facilities, and kinetic models of plasma-chemical processes are developed. Scaling of the results of model experiments makes it possible to predict the measurement of the impurity flows at the level (10–9–10–13) Pa m3 s–1 with the localization of sources determined by the spatial resolution of the optical system.

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Section: Localization Of Sources Of the Penetration Of Water Moleculesmentioning

confidence: 99%