3D field phase-space control in tokamak plasmas

A small relaxation of the axisymmetric magnetic field of a tokamak into a non-axisymmetric three-dimensional (3D) configuration can be effective to control magnetohydrodynamic instabilities, such as edge-localized modes. However, a major challenge to the concept of 3D tokamaks is that there are virtually unlimited possible choices for a 3D magnetic field, and most of them will only destabilize or degrade plasmas by symmetry breaking. Here, we demonstrate the phase-space visualization of the full 3D field-operating windows of a tokamak, which allows us to predict which configurations will maintain high confinement without magnetohydrodynamic instabilities in an entire region of plasmas. We test our approach at the Korean Superconducting Tokamak Advanced Research (KSTAR) facility, whose 3D coils with many degrees of freedom in the coil space make it unique for this purpose. Our experiments show that only a small subset of coil configurations can accomplish edge-localized mode suppression without terminating the discharge with core magnetohydrodynamic instabilities, as predicted by the perturbative 3D expansion of plasma equilibrium and the optimizing principle of local resonance. The prediction provided excellent guidance, implying that our method can substantially improve the efficiency and fidelity of the 3D optimization process in tokamaks

Percepción de la experiencia de violencia doméstica en mujeres víctimas de maltrato de pareja

This study aimed to understand the perceptions that domestic violence has a group of women victims of it. To this end we conducted a qualitative study on the technique of focus groups. The research participants were 9 women victims of domestic violence between the ages of 25 and 60 years served in an ONG of Bogotá city. It was found in women with a negative perception of themselves while minimizing many of the skills they possess, and evaluating their skills as inferior to men, which have learned from their families of origin.El presente estudio tuvo como objetivo comprender las percepciones que sobre la violencia doméstica tiene un grupo de mujeres víctimas de la misma. Para tal fin, se llevó a cabo una investigación de tipo cualitativo bajo la técnica de grupos focales. Las participantes de la investigación fueron nueve mujeres víctimas de la violencia doméstica, con edades comprendidas entre los 25 y 60 años, atendidas en una ONG de la ciudad de Bogotá. Se encontró que las mujeres tienen una percepción negativa de sí mismas, aprendida desde sus familias de origen, pues minimizan muchas de sus capacidades y evalúan sus habilidades como inferiores a las de los hombres