Diego Garfias - Academia.edu (original) (raw)

Papers by Diego Garfias

Research paper thumbnail of Applied Superconductivity in Current and Emerging Technologies

An ever-present phenomenon in usual electrical wires is that they exhibit a resistance to the flo... more An ever-present phenomenon in usual electrical wires is that they exhibit a resistance to the flow of electric current, producing heat, which means that part of the energy is lost in the process. This is why a computer processor, data centers and big transformers in power stations get hot; and why cooling systems have to be used along. Most materials, copper included, follow this behavior, however there are materials that, under certain conditions, won't exhibit any resistance to the flow of electric current, the so-called superconductors (SC).

Research paper thumbnail of Aplicación de marketing experiencial para la fidelización de los clientes de un salón spa en la ciudad de Trujillo en el año 2015

Research paper thumbnail of Simulation of Non-Uniform Current Distribution in Stacked HTS Tapes

Plasma and Fusion Research

Low-Temperature Superconductors (LTS) are sensitive to non-uniform current distribution, which pr... more Low-Temperature Superconductors (LTS) are sensitive to non-uniform current distribution, which produces quenching. So, transposition of strands is indispensable in LTS cables to help current redistribution. In contrast, High-Temperature Superconductors (HTS) have higher thermal stability, which is expected to help current redistribution among strands (tapes) without quenching. Generally, HTS cable designs consider transposition to reduce quench likelihood and better handling AC operation. However, transposition causes mechanical strain in the tapes, reducing their performance. Recently, a 20-kA-class Stacked Tapes Assembled in Rigid Structure (STARS) conductor is being developed at NIFS, for the next-generation helical devices. To weigh the simple stacking feasibility of HTS tapes, a previous experiment confirmed, that 5 non-transposed HTS tapes can stably conduct a worst-case non-uniform current distribution without quenching. This further suggests that when using HTS tapes for DC HTS cables, transposition may be optional, but not strictly required. A numerical simulation was developed, dealing with the current distribution among the HTS tapes in a worst-case scenario, reproducing the previous experimental observation, and a second experiment was performed to give insights into the contact resistance between HTS tapes. The self-magnetic field effect and temperature fluctuations are to be explored for quench scenarios.

Research paper thumbnail of Applied Superconductivity in Current and Emerging Technologies

An ever-present phenomenon in usual electrical wires is that they exhibit a resistance to the flo... more An ever-present phenomenon in usual electrical wires is that they exhibit a resistance to the flow of electric current, producing heat, which means that part of the energy is lost in the process. This is why a computer processor, data centers and big transformers in power stations get hot; and why cooling systems have to be used along. Most materials, copper included, follow this behavior, however there are materials that, under certain conditions, won't exhibit any resistance to the flow of electric current, the so-called superconductors (SC).

Research paper thumbnail of Aplicación de marketing experiencial para la fidelización de los clientes de un salón spa en la ciudad de Trujillo en el año 2015

Research paper thumbnail of Simulation of Non-Uniform Current Distribution in Stacked HTS Tapes

Plasma and Fusion Research

Low-Temperature Superconductors (LTS) are sensitive to non-uniform current distribution, which pr... more Low-Temperature Superconductors (LTS) are sensitive to non-uniform current distribution, which produces quenching. So, transposition of strands is indispensable in LTS cables to help current redistribution. In contrast, High-Temperature Superconductors (HTS) have higher thermal stability, which is expected to help current redistribution among strands (tapes) without quenching. Generally, HTS cable designs consider transposition to reduce quench likelihood and better handling AC operation. However, transposition causes mechanical strain in the tapes, reducing their performance. Recently, a 20-kA-class Stacked Tapes Assembled in Rigid Structure (STARS) conductor is being developed at NIFS, for the next-generation helical devices. To weigh the simple stacking feasibility of HTS tapes, a previous experiment confirmed, that 5 non-transposed HTS tapes can stably conduct a worst-case non-uniform current distribution without quenching. This further suggests that when using HTS tapes for DC HTS cables, transposition may be optional, but not strictly required. A numerical simulation was developed, dealing with the current distribution among the HTS tapes in a worst-case scenario, reproducing the previous experimental observation, and a second experiment was performed to give insights into the contact resistance between HTS tapes. The self-magnetic field effect and temperature fluctuations are to be explored for quench scenarios.