RESUMEN
A magnetically driven fast-ion loss detector system for the ASDEX Upgrade tokamak has been designed and will be presented here. The device is feedback controlled to adapt the detector head position to the heat load and physics requirements. Dynamic simulations have been performed taking into account effects such as friction, coil self-induction, and eddy currents. A real time positioning control algorithm to maximize the detector operational window has been developed. This algorithm considers dynamical behavior and mechanical resistance as well as measured and predicted thermal loads. The mechanical design and real time predictive algorithm presented here may be used for other reciprocating systems.
RESUMEN
A conceptual design of a reciprocating fast-ion loss detector for ITER has been developed and is presented here. Fast-ion orbit simulations in a 3D magnetic equilibrium and up-to-date first wall have been carried out to revise the measurement requirements for the lost alpha monitor in ITER. In agreement with recent observations, the simulations presented here suggest that a pitch-angle resolution of â¼5° might be necessary to identify the loss mechanisms. Synthetic measurements including realistic lost alpha-particle as well as neutron and gamma fluxes predict scintillator signal-to-noise levels measurable with standard light acquisition systems with the detector aperture at â¼11 cm outside of the diagnostic first wall. At measurement position, heat load on detector head is comparable to that in present devices.
RESUMEN
BACKGROUND: Accidents in childhood are an important health problem, mainly in situations of social and environmental risk. Additionally, the lack of studies in primary health care, encouraged us to set up a study in order to establish the characteristics of accidents in childhood attended in a health center, their relation with the child's socio-familiar situation and medical care delivered. METHODS: We describe children's accidents occurred in our area (2,543 children 0-14 years old, 788 of them living in deprived neighbourhoods) during 1992 attended in the health center. Study data was collected from data included in emergencies and medical records of the health center. We included information on: age, sex, socio-familiar situation, accident, lesion, and health care delivered characteristics. RESULTS: We include 623 accidents: annual cumulated incidence = 245/1,000 children; males were more affected (58.4%); the accidents occurred mainly in the household (35.6%); the most frequent causes were blows (39.9%) and falls (30.5%); the most frequent lesions were injuries (29.7%) and blows (25.7%). Location of the lesions were the superior limbs (33.5%) and head and neck (25.98%). About 12.5% were delivered to the hospital, 17.8% of them required inpatient care, one died. Children of deprived boroughs have a relative risk of being attended for accident in our center of 4.2 (CI 95% = 3.64-4.84) compared with the rest of the area. 79 children have had repeated accidents, they occurred mainly in only 27 families, 92.6% of whom live in deprived areas. CONCLUSIONS: Our health center is attending a high frequency of children's accidents, most of them can be treated in the health center, the cases are concentrated in deprived boroughs and in risk families.
