Material Assessment for ITER's Collective Thomson Scattering first mirror

Conference · Wed Jul 01 04:00:00 EDT 2015

DOI:https://doi.org/10.1109/ANIMMA.2015.7465646· OSTI ID:22531426

Santos, R.; Policarpo, H.; Goncalves, B.; Varela, P. ^[1]; Nonboel, E.; Klinkby, E.; Lauritzen, B. ^[2]; Romanets, Y.; Luis, R.; Vaz, P. ^[3]

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1. Instituto de Plasmas e Fusao Nuclear, Instituto Superior Tecnico, Universidade de Lisboa, 1049-001 Lisboa (Portugal)
2. Center for Nuclear Technologies, Technical University of Denmark (Denmark)
3. Centro de Ciencias e Tecnologias Nucleares, Instituto Superior Tecnico, Universidade de Lisboa (Portugal)

The International Thermonuclear Energy Reactor (ITER) Collective Thomson Scattering (CTS) system is a diagnostic instrument that measures plasma density and velocity through Thomson scattering of microwave radiation. Some of the key components of the CTS are quasi-optical mirrors that are used to produce astigmatic beam patterns, which have impact on the strength and spatial resolution of the diagnostic signal. The mirrors are exposed to neutron radiation, which may alter the quality of the signal received. In this work, three different materials (molybdenum (Mo), stainless steel 316 (SS-316) and tungsten (W)) are considered for the first mirror of the CTS. The objective is to access which of the material studied are best suited for this mirror, considering different neutron radiation loads simulated scenarios defined by ITER, based on the resultant stresses and temperature distributions. For it, the neutron irradiation, and subsequent heat-load on the mirrors are simulated using the Monte Carlo N-Particle (MCNP) code. Based on the MCNP heat-load results, transient thermal-structural Finite Element Analysis (FEA) of the mirror over a 400 s discharge, with and without cooling on the rear side, are conducted using in commercial FEA software ANSYS. Results show that of the tested materials Mo and W are the most suitable material for this application. Even though, this study does not yet consider the variation of the material properties with temperature, it presents a quick initial satisfactory assessment that may be considered in subsequent and more complex analysis. (authors)

• Research Organization: Institute of Electrical and Electronics Engineers - IEEE, 3 Park Avenue, 17th Floor, New York, N.Y. 10016-5997 (United States)
• OSTI ID: 22531426
• Report Number(s): ANIMMA--2015-IO-390
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
COMPUTERIZED TOMOGRAPHY
FINITE ELEMENT METHOD
HEATING LOAD
IRRADIATION
ITER TOKAMAK
MICROWAVE RADIATION
MIRRORS
MOLYBDENUM
MONTE CARLO METHOD
NEUTRONS
PLASMA DENSITY
PLASMA DIAGNOSTICS
STAINLESS STEEL-316
STRESSES
TEMPERATURE DISTRIBUTION
THOMSON SCATTERING
TRANSIENTS
TUNGSTEN