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Sökning: WFRF:(Salvador R.) > Konferensbidrag

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  • Guidi, V., et al. (författare)
  • Characterization of crystals for steering of protons through channelling in hadronic accelerators
  • 2006
  • Ingår i: EPAC 2006. - Edinburgh : European Physical Society Accelerator Group (EPS-AG). - 9290832797 ; , s. 1523-1525
  • Konferensbidrag (refereegranskat)abstract
    • Channeling of relativistic particles through a crystal may be useful for many applications in accelerators, and particularly for collimation in hadronic colliders. Efficiency proved to be dependent on the state of the crystal surface and hence on the method used for preparation. We investigated the morphology and structure of the surface of the samples that have been used in accelerators with high efficiency. We found that crystal fabrication by only mechanical methods (dicing, lapping, and others) leads to a superficial damaged layer, which is correlated to performance limitation in accelerators. A planar chemical etching was studied and applied in order to remove the superficial damaged layer. RBS channeling analysis with low-energy protons and 4He + highlighted better crystal perfection at surface, as a result of the etching. A protocol for preparation and characterization of crystal for channelling has been developed, which may be of interest for reliable operation with crystals in accelerators.
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  • Perez-Rapela, Daniel, et al. (författare)
  • Comparison of WorldSID to PMHS kinematics in far-side impact
  • 2018
  • Ingår i: Conference proceedings International Research Council on the Biomechanics of Injury, IRCOBI. - 2235-3151. ; 2018-September, s. 630-654
  • Konferensbidrag (refereegranskat)abstract
    • Far-side impacts represent 9.5% of all automobile crashes and 8.3% of all MAIS3+ injuries. This type of event generates loads that challenge current restraint systems by setting the occupant on an inward motion. This complex motion, influenced by a number of restraint and impact parameters, often results in a loss of shoulder-to-belt contact. Reducing the negative outcomes of this type of crash requires an ATD capable of correctly representing the kinematics and sensitivity to restraint and impact parameters. The WorldSID is the most advanced ATD for injury evaluation in near-side crashes. However, its suitability for far-side scenarios still needs to be evaluated. This study performed a parametric evaluation of the effect of restraint and impact parameters on WorldSID kinematics. A total of 19 tests in six different test configurations were conducted, matching previously published PMHS tests. The ATD motion was tracked with a 3D high-speed motion-capture system. The parameters varied were: the impact severity and direction; D-ring position; pelvic restraint; and seat belt pretensioning. The ATD response and sensitivity to parameters were evaluated and compared to previously published PMHS data. The results show discrepancies in shoulder-belt engagement, head and torso kinematics and sensitivity to initial conditions.
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