Engineering topics
Publications and source records attributed to Young, B..
We report on progress towards the development of a small, low mass and power, and high stability mercury trapped ion frequency standard for the Global Positioning System.
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We report on the development of a small, low mass and power, and high stability mercury trapped ion frequency standard for spaceflight.
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In this paper a short review of the role of clocks and oscillators in space is presented, together with some future projections for laser based systems.
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Practical, continuous operating mercury trapped ion frequency standards have traditionally used a helium buffer gas to increase loading efficiency and cool ions to near room temperature.
Dusty plasmas are present in comets, in the ring systems of the outer planets, and in the interstellar medium. A two-dimensional particle-in-cell (PIC) model of a dusty plasma is presented in this paper. The PIC code is best suited for modeling the plasma-dust interaction for large grains, with diameters of the order of a centimeter. We have modeled the charging process for an individual dust grain and the associated potential pattern in the surrounding plasma. We have also considered the case of a large number of grains in a plasma, with intergrain separations of the order of the Debye length, and have shown that the plasma becomes depleted and the charge on a dust grain is reduced, as other workers in this field have predicted (cf. C. K. Goertz, 1989). We examine the electron and ion distribution functions in the vicinity of a charged grain and demonstrate that the ions near a grain have clearly been accelerated by the electrostatic potential.