https://hdl.handle.net/2238/11318 2026-05-23T13:23:12Z https://hdl.handle.net/2238/9819 Implementation of stellarator of Costa Rica 1 SCR-1 Vargas-Blanco, Ivan; Otárola-Zúñiga, Carlos; Zamora-Picado, Esteban; Mora-Meléndez, Jaime; Mora, A; Asenjo, J.; Villalobos, E The SCR-1 is a small modular stellarator designed, constructed and is being implemented at Instituto Tecnológico de Costa Rica. The project is its final phase of commissioning and it is expected to be operational in June 2015. This article aims at summarizing the SCR-1 project from the engineering and manufacturing point of view, particularly highlighting the construction of the toroidal vacuum vessel and the modular coils. Conferencia 2015-01-01T00:00:00Z https://hdl.handle.net/2238/7213 Engineering of the Stellarator of Costa Rica: SCR-1 Piedra, C.; Jiménez, W.; Esquivel, L.; Esquivel, R.; Sánchez, K.; González, J.; Mora-Meléndez, Jaime; Otárola-Zúñiga, Carlos; Vargas-Blanco, Iván This Paper aims at briefly describing the challenge of the design and construction of the Stellarator of Costa Rica 1 (SCR-1) [1]. The SCR-1 is a small modular Stellarator for magnetic confinement of plasma (Ro=0.238 m, <a>=0.059 m, Ro/a>4.0, expected plasma volume ≈ 0.016 m3, 10 mm thickness 6061-T6 aluminum vacuum vessel) developed by the Plasma Laboratory for Fusion Energy and Applications of the Instituto Tecnológico de Costa Rica (ITCR). https://www.scopus.com/inward/record.url?eid=2-s2.0-84938149517&partnerID=40&md5=9fd63fd2eb1657d79d29405b7e023cdd 2015-03-01T00:00:00Z https://hdl.handle.net/2238/7206 Transport, stability and plasma control studies in the TJ-II stellarator Sánchez, J.; Alegre, D.; Alonso, A.; Alonso, J.; Alvarez, P.; Arévalo, J.; Ascasíbar, E.; Baciero, A.; Baiao, D.; Barcala, J. The main TJ-II results since 2012 are presented in this overview. Impurity confinement is studied showing an isotopic dependence of impurity confinement time, asymmetries in parallel impurity flows in TJ-II ion-root plasmas and impurity density asymmetries within a flux surface. In addition, first observations of electrostatic potential variations within the same magnetic flux surface are presented. Evidence of the impact of three-dimensional magnetic structures on plasma confinement and L-H transitions is also presented. The leading role of the plasma turbulence is emphasized by the observed temporal ordering of the limit cycle oscillations at the L-I-H transition. Comparative studies between tokamaks and stellarators have provided direct experimental evidence for the importance of multi-scale physics to unravel the impact of the isotope effect on transport. Novel solutions for plasma facing components based on the recently installed Li-liquid limiters (LLLs) have been developed on TJ-II, showing the self-screening effect of evaporating liquid lithium, protecting plasma-facing components against heat loads, and tritium inventory control. Regarding plasma stability, magnetic well scan experiments show that traditional stability criteria, on which the optimization of stellarator configurations is based, may miss some stabilization mechanisms. Further effects of ECRH on Alfvénic instabilities are investigated, showing that moderate off-axis ECH power deposition modifies the continuous nature of the Alfvén eigenmodes, and frequency chirping sets in. This result shows that ECH can be a tool for AE control that might be ITER and reactor-relevant. © 2015 EURATOM. https://www.scopus.com/inward/record.url?eid=2-s2.0-84948166844&partnerID=40&md5=f6421a2196079bfc16d78dac06a5ea2b 2015-07-01T00:00:00Z https://hdl.handle.net/2238/7205 Copper deposition on fabrics by rf plasma sputtering for medical applications Segura, G.; Guzmán, P.; Zúñiga, P.; Chaves, S.; Barrantes, Y.; Navarro, G.; Asenjo, J.; Guadamuz, S.; Vargas, V.; Chaves, J. The present work is about preparation and characterization of RF sputtered Cu films on cotton by the usage of a Magnetron Sputter Source and 99.995% purity Cu target at room temperature. Cotton fabric samples of 1, 2 and 4 min of sputtering time at discharge pressure of 1×10-2 Torr and distance between target and sample of 8 cm were used. The main goal was to qualitatively test the antimicrobial action of copper on fabrics. For that purpose, a reference strain of Escherichia Coli ATCC 35218 that were grown in TSA plates was implemented. Results indicated a decrease in the growth of bacteria by contact with Cu; for fabric samples with longer sputtering presented lower development of E. coli colonies. The scope of this research focused on using these new textiles in health field, for example socks can be made with this textile for the treatment of athlete's foot and the use in pajamas, sheets, pillow covers and robes in hospital setting for reducing the spread of microorganisms. © Published under licence by IOP Publishing Ltd. https://www.scopus.com/inward/record.url?eid=2-s2.0-84938151607&partnerID=40&md5=bf2da795caced442546f442aa330773a 2015-03-01T00:00:00Z