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32 results on '"Buonocore F"'

31. Study of solid molecular deuterium D2 growth under gas pressure

Author

S. Giusepponi, F. Buonocore, M. Celino, M. Lupo Pasini, A. Frattolillo, S. Migliori, Giusepponi, S., Buonocore, F., Celino, M., Lupo Pasini, M., Frattolillo, A., and Migliori, S.

Subjects
Nuclear Energy and Engineering, Molecular dynamics simulations, Mechanical Engineering, General Materials Science, Pellet formation, Deuterium, Civil and Structural Engineering
Abstract

The injection of high-speed cryogenic pellets made of frozen hydrogen-isotopes, represents to date the most effective method to fuel magnetically confined thermonuclear fusion plasmas. Moreover, the injection of very large pellets composed of cryogenic solid of some suitable impurity (typically a noble-gas such as H2, Ne, or H2/Ne, D2/Ne mixtures), shattered in relatively small fragments just before entering the plasma, seems to be the most promising method to reduce the damage risks for the plasma-facing components in case of a plasma disruption. This technology, known as "Shattered Pellet Injection" (SPI), allows to spread out the plasma energy and mitigate possible damage to the in-vessel components, as well as to densify the plasma to suppress the formation of runaway electrons, and/or dissipate their energy. Several techniques to produce and launch cryogenic pellets have been investigated in the past decades. "Pipe gun" injectors are reliable and relatively simple devices are still commonly used today. They make use of single- or two-stage pneumatic light-gas guns to accelerate the pellet at high speeds. In these injectors, the cryogenic pellets are formed “in situ” (i.e., inside the launching barrel), by de-sublimating them directly from the gas phase, i.e., at temperatures and pressures below those of the triple point. The simplest case is pure deuterium pellets (T < 18.7 K, P < 171.3 hPa). The production of good quality solid deuterium, capable of withstanding the mechanical stress during the acceleration of the pellets, is a key issue. To this end the phase transition of deuterium from gas to solid (and vice versa) is modeled with extensive molecular-dynamics (MD) simulations. Moreover, the solid growth from the gas phase is simulated in an ample range of temperatures and pressures, to find the best compromise between growth velocity and mechanical properties of the resulting solid system.

Published
2022
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32. Carrier localization and photoluminescence in porous silicon

Author

Francesco Buonocore, Domenico Ninno, Giuseppe Iadonisi, Ninno, Domenico, Iadonisi, Giuseppe, and Buonocore, F.

Subjects
Photoluminescence, Materials science, Lateral surface, Silicon, business.industry, Quantum wire, chemistry.chemical_element, General Chemistry, Electron, Condensed Matter Physics, Porous silicon, Molecular physics, Optics, chemistry, Materials Chemistry, Porous medium, business, Absorption (electromagnetic radiation)
Abstract

We show that the optical absorption and emission energies in porous silicon can be accounted for in a quantum wire confinement model where both the electron and the hole are localized by lateral surface wire undulations. Localization energies for both the particles have been numerically calculated within the effective mass approximation showing that there exists a limited class of wire geometries which are consistent with porous silicon optical and structure analysis data.

Published
1999
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