Eventos

1
Dic

Seminario MACC

El Departamento de Matemáticas Aplicadas y Ciencias de la Computación (MACC) tiene el gusto de invitar a toda la comunidad a participar en el Seminario MACC, a desarrollarse el viernes 1 de diciembre en las instalaciones de la Universidad del Rosario. 

Lugar: Salón 230 (Claustro), Calle 12C 6 - 25
Fecha: 1 de diciembre de 2017.
Hora: 2:00 p. m. - 4:00 p. m.

Conferencista invitados


 

2:00 p. m. a 3:00 p. m. Multiscale Modeling and Simulation in Fusion Reactors
Computational Materials Physicist.
Analytical Mechanics Associates, Inc.
NASA Ames Research Center.

One of the most important challenges for the successful commercialization of fusion power is the development of plasma facing materials (PFMs) that can tolerate the extreme conditions of elevated temperatures and high particle flux of H isotopes and He present in fusion reactors. W is an attractive material for such applications, mainly due to its low H solubility, low sputtering yield, high melting point, and high thermal conductivity. However, the material is still deleteriously affected by the plasma and fusion byproducts. In particular, the He irradiation modifies the near-surface microstructure by creating bubbles.

This is a key problem, as He bubbles increase the retention of tritium in the wall, drastically influencing the long-term thermomechanical stability and creating a large radioactive inventory, with hazardous consequences and a significant increase in fuel costs. Moreover, experiments have shown that a fuzzlike nanostructure develops on the W surface under the operating conditions (temperature, He impact energy, and He flux) expected for ITER’s divertor, which increases the nucleation of bubbles, the retention of H isotopes, and the production of high-Z dust. In this talk I will present a bottom-up multiscale approach focused on understanding the microstructure evolution of W as PFM. The modeling process starts with the generation of interatomic potentials fitted to DFT data, molecular dynamics simulations (MD) based on these potentials, accelerated molecular dynamics (AMD) to reach experimental time scales, and the transfer of parameters to mesoscale models. I will highlight the MD and AMD results, which correspond to my contribution to the project as a former researcher at Los Alamos National Laboratory.

Biografía
Luis Sandoval es un investigador en física de materiales en el Centro de Investigaciones Ames de la NASA (Mountain View, California). Realizó sus estudios de pregrado y maestría en física en la Universidad Nacional de Colombia, y de doctorado en la Universidad de Kaiserslautern (Alemania). Del año 2010 al 2016 trabajó como investigador postdoctoral en el Laboratorio Nacional Lawrence Livermore (California) y en el Laboratorio Nacional de Los Álamos (Nuevo México). Su trayectoria investigativa ha incluido el estudio computacional de procesos de deformación en metales, degradación de materiales bajo radiación y procesos de cristalización.

Ubicación

Compartir