R. C. Carrasco
A5040605904- Magnetic confinement fusion research
- Ionosphere and magnetosphere dynamics
- Superconducting Materials and Applications
- Particle accelerators and beam dynamics
- Occupational Therapy Practice and Research
- Laser-Plasma Interactions and Diagnostics
- Fusion materials and technologies
- Educational and Psychological Assessments
- Neuroscience, Education and Cognitive Function
- Family and Disability Support Research
- Creativity in Education and Neuroscience
- Education Systems and Policy
- Children's Physical and Motor Development
- Nuclear Physics and Applications
- Innovations in Medical Education
- Innovative Teaching and Learning Methods
- Behavioral and Psychological Studies
- Early Childhood Education and Development
- Child Therapy and Development
- Plasma Diagnostics and Applications
- Educational Games and Gamification
- Education and Technology Integration
- Infant Development and Preterm Care
- Child and Adolescent Health
- Mindfulness and Compassion Interventions
Dirección de Investigación y Desarrollo
2025
Atacama Large Millimeter Submillimeter Array
2024
Universidad Complutense de Madrid
1997-2024
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2002-2024
Unidades Centrales Científico-Técnicas
2002-2024
Nova Southeastern University
2015
Instituto Conmemorativo Gorgas de Estudios de la Salud
2009
Augusta University
1993
The first experimental campaign of the TJ-II stellarator has been conducted using electron cyclotron resonance heating (, ) with a pulse length . flexibility device used to study five different configurations varying plasma volume and rotational transform. In this paper, main results are presented and, in particular, influence plasma-wall interaction phenomena on confinement is briefly discussed.
This paper presents the latest results on confinement studies in TJ-II stellarator. The inherently strong plasma–wall interaction of has been successfully reduced after lithium coating by vacuum evaporation. Besides H retention and low Z , Li was chosen because there exists a reactor-oriented interest this element, thus giving special relevance to investigation its properties. Li-coating led important changes plasma performance. Particularly, effective density limit NBI plasmas extended...
This paper describes a series of experiments performed in TJ-II stellarator with the aim studying influence magnetic configuration on stability and transport properties plasmas. Plasma potential profiles have been measured several configurations up to plasma core heavy ion beam probe diagnostic. Low-order rational surfaces positioned at different radii observing effect features. edge turbulent has studied that are marginally stable due decreased well. Results show dynamical coupling between...
American tegumentary leishmaniasis is an increasing public health problem in Panama. This study describes the clinical characteristics and molecular epidemiology of Panama over a 5-year period (2004–2008). Additionally, we applied polymerase chain reaction (PCR)-restriction fragment length polymorphism (RFLP)–based assay to identify Leishmania species isolates, skin scrapings, sandflies specimens. Whereas 60.3% cases were detected with conventional parasitologic techniques (smear or vitro...
This paper presents an overview of experimental results and progress made in investigating density control using Li-coating, transport L–H transitions TJ-II. The Li-coating changes drastically the plasma–wall interaction, decreasing recycling, enlarges substantially operational range device delaying appearance radiative collapse that happens for higher densities, which permits confinement properties much denser plasmas to be studied. Moreover, mode transition has only been achieved after...
Abstract A pellet-induced enhanced confinement (PiEC) phase, with general characteristics similar to those reported for the stellarator W7-X, is observed after single pellet injection (>10 19 H atoms) into neutral beam heated phase of plasmas in mid-sized heliac-type TJ-II. In addition a step-like increase density, plasma diamagnetic energy content rises significantly respect that reference discharges, time similarly when compared International Stellarator Scaling law predictions (Yamada...
This paper presents an overview of experimental results and progress made in investigating the role magnetic configuration on stability transport TJ-II stellarator. Global confinement studies have revealed a positive dependence energy rotational transform plasma density, together with different parametric dependences for metallic boronized wall conditions. Spontaneous biasing-induced improved transitions, some characteristics that resemble those previously reported H-mode regimes other...
Enhanced confinement is observed in neutral beam injector (NBI)-heated hydrogen discharges made the stellarator TJ-II after injection of a single cryogenic fuel pellet into plasma core. In addition to expected increase electron density, ne, core (PI), diamagnetic energy content seen rise, with respect similar without PI, by up 40%. Furthermore, time, τEdiag, as determined using loop, enhanced when compared predictions obtained International Stellarator Scaling law [H. Yamada et al., Nucl....
Abstract TJ-II stellarator results on modelling and validation of plasma flow asymmetries due to on-surface potential variations, fuelling physics, Alfvén eigenmodes (AEs) control stability, the interplay between turbulence neoclassical (NC) mechanisms liquid metals are reported. Regarding neoclassically predicted asymmetries, its impact radial electric field along flux surface has been successfully validated against Doppler reflectometry measurements. Research physics core with pellets...
The effects of 3D geometry are explored in TJ-II from two relevant points view: neoclassical transport and modification stability dispersion relation waves. Particle fuelling impurity studied considering the properties, paying attention to both other possible mechanisms. magnetic topology on stability, confinement Alfvén Eigenmodes properties also explored, showing possibility controlling modes by modifying configuration; onset similar geodesic acoustic driven fast electrons or ions; weak...
This study investigated whether a relation exists between attachment and sensory modulation in young children. Participants were 68 children ages 3-6 yr recruited through the local community. Caregivers asked to complete standardized behavioral inventory of patterns, parent-child interactions observed their home. The evaluator categorized these on basis items related security dependency. Results revealed modest correlations modulation: rs(66)=.28, p=.02. capacity predict function by...
Abstract The main results obtained in the TJ-II stellarator last two years are reported. most important topics investigated have been modelling and validation of impurity transport, gyrokinetic simulations, turbulence characterisation, effect magnetic configuration on fuelling with pellet injection, fast particles liquid metal plasma facing components. As regards transport research, a number working lines exploring several recently discovered effects developed: tangential drifts neoclassical...
TJ-II is a four period, low magnetic shear stellarator (R = 1.5 m, < 0.22 B0 ⩽ 1.2 T) which was designed to have high degree of configuration flexibility. In the most recent experimental campaign, coupling full ECRH power (PECRH 600 kW) plasma has been possible using two transmission lines different densities. Both helium and hydrogen fuelled plasmas investigated. The article reviews latest physics results in particle control, effects, transport fluctuation studies.
The ITER WAVS (visible and infrared Wide Angle Viewing System) provides measurements of surface temperature for the plasma facing components by thermography. One its most important roles is to protect from damage. It also takes images visible spectral range emission. diagnostic consists 15 views distributed in four equatorial ports (3, 9, 12 17), it will contribute Machine protection, Basic control Physics analysis. final design system port (EP12) includes three lines sight (LoS) that have...
The ALMA Observatory experienced a cyberattack in late October 2022, disrupting regular operations and critical computing services for seven weeks. Although no scientific data was lost, essential were affected. incident highlighted the organization's limited knowledge of recovery assets absence specific cyber-attack disaster policy. attack raised cybersecurity awareness within organization, shifting it from secondary role to cultural necessity. paper discusses post-attack actions,...
The need for a steam ingress environmental experiment is very significant to understand the impact of accidental in-vessel coolant leaks at ITER and study exposure optical diagnostics humid conditions. This could happen as result damage cooling pipes due runaway electrons generated during plasma disruptions in ITER. In order know scope this potential impact, an assessment was carried out simulate elements strong hostile moisture After test, different measurements on mirrors were performed...
The main TJ-II results since 2012 are presented in this overview. Impurity confinement is studied showing an isotopic dependence of impurity time, asymmetries parallel flows ion-root plasmas and density within a flux surface. In addition, first observations electrostatic potential variations the same magnetic surface presented. Evidence impact three-dimensional structures on plasma L–H transitions also leading role turbulence emphasized by observed temporal ordering limit cycle oscillations...
The OLMAT (Optimization of Liquid Metal Advanced Targets) facility has recently undergone the commissioning and start-up phases. Solid Titanium-Zirconium- Molybdenum (TZM) alloy liquid tin (Sn) metallic targets were exposed to a hydrogen neutral beam injector (NBI) particle flux with power densities up 58 ± 14 MW/m2, pulse duration 150 ms, repetition rates 2 pulses/minute. These parameters are well above estimates based on typical performance this NBI system when used for heating plasmas in...
ECR (electron cyclotron resonance) heated plasmas have been studied in the low magnetic shear TJ-II stellarator (R = 1.5 m, a<0.22 B 1 T, f 53.2 GHz, PECRH 300 kW, power density 1-25 W cm-3). Recent experiments explored flexibility of across a wide range plasma volumes with different rotational transforms and rational surface densities. In this paper, main results campaign are presented and, particular, influence iota surfaces on profiles is discussed.