Ion implantation into microspheres and wires may open a new applicationˆeld. Therefore, we extended the TRIM (Transport of Ions in Matter) code that simulates ion distributions for substrates to be applicable to spherical and cylindrical targets. Next, weˆtted simulated proˆles calculated by the TRIM code to the experimental ones to determine adequate parameters of electronic stopping powers. And, we simulated about various combinations to use the extended TRIM code which used parameters. Calculated projected ranges and implantation energies are reduced to modiˆed reduced projected ranges and average reduced energy. Also, we derive the relations between the average reduced energy and the modiˆed reduced projected ranges for spherical and cylindrical targets.
. は じ め に
In the present work, a superlattice structure comprising superconducting and insulator layers is studied. Here, if a magnetic field is applied parallel to the layers, the lack of a pinning center leads to a novel transition; in particular, as the applied magnetic field is reduced, the stationary wave surrounding the magnetic flux quantum in the superconducting layer eventually collides with the superconducting–insulating interfaces on both sides because its radius becomes larger than the width of the superconducting layer. At this instant, the stationary wave will collapse, and a transition will occur: the magnetic quanta are collapsed and thus the uniform magnetic field distribution is achieved, which corresponds to the transition from the superconducting state to the normal state over critical current. Considering a one-dimensional model of the structure, a critical current density equation is derived that indicates an increase in the critical current density for increased applied magnetic field. Subsequently, the same calculation was conducted after changing the direction of the magnetic field component, and the combination of these two calculations expresses the anisotropic property of the structure. The phenomenon is also predicted for anisotropic critical current density. This phenomenon is an important discovery that helps manufacture high-temperature superconducting tape as well as large high-temperature superconducting coils.
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