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Title: Erosion products of plasma facing materials formed under ITER-like transient load and deuterium retention in them

Erosion of the plasma-facing materials in particular evaporation of the materials in a fusion reactor under intense transient events is one of the problems of the ITER. The current experimental data are insufficient to predict the properties of the erosion products, a significant part of which will be formed during transient events (edge-localized modes (ELMs) and disruptions). The paper concerns the experimental investigation of the graphite and tungsten erosion products deposited under pulsed plasma load at the QSPA-T: heat load on the target was 2.6 MJ/m{sup 2} with 0.5 ms pulse duration. The designed diagnostics for measuring the deposition rate made it possible to determine that the deposition of eroded material occurs during discharge, and the deposition rate is in the range (0.1–100) × 10{sup 19} at/(cm{sup 2} s), which is much higher than that for stationary processes. It is found that the relative atomic concentrations D/C and D/(W + C) in the erosion products deposited during the pulse process are on the same level as for the stationary processes. An exposure of erosion products to photonic energy densities typical of those expected at mitigated disruptions in the ITER (pulse duration of 0.5–1 ms, integral energy density of radiation ofmore » 0.1–0.5 MJ/m2) significantly decreases the concentration of trapped deuterium.« less
Authors:
;  [1] ; ;  [2] ; ; ; ; ;  [1]
  1. State Research Center of the Russian Federation Troitsk Institute for Innovation & Fusion Research (Russian Federation)
  2. National Research Nuclear University Moscow Engineering Physics Institute (Russian Federation)
Publication Date:
OSTI Identifier:
22471967
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Atomic Nuclei; Journal Volume: 78; Journal Issue: 10; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; CONCENTRATION RATIO; DEPOSITION; DEUTERIUM; EDGE LOCALIZED MODES; ENERGY DENSITY; EROSION; FIRST WALL; GRAPHITE; HEATING LOAD; ITER TOKAMAK; PLASMA; PLASMA DIAMAGNETISM; PLASMA DISRUPTION; RETENTION; TRANSIENTS; TRAPPING; TUNGSTEN