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1 Aug 2011

Volume 99, Issue 5, Articles (05xxxx)

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Appl. Phys. Lett. 99, 051112 (2011); http://dx.doi.org/10.1063/1.3617421 (3 pages)

Wei Li, Jun Chen, Gerard Nouet, Liang-yao Chen, and Xunya Jiang
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Meissner effect funneling

S. P. McNeil, M. H. Weber, and K. G. Lynn

Appl. Phys. Lett. 99, 054101 (2011); http://dx.doi.org/10.1063/1.3619850 (3 pages)

Online Publication Date: 2 August 2011

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Focusing of a positron beam in a magnetic field funnel is demonstrated using a preferentially-cooled pure niobium single crystal into the superconductor region. A magnetic field increase of 18% was indirectly measured through a hole in a cylindrical niobium sample. The results demonstrate a charged particle beam focusing technique. The results have implications for the brightness enhancement of positron beams and trap-based beams.
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74.25.Ha Magnetic properties including vortex structures and related phenomena
41.75.-i Charged-particle beams
41.85.Lc Particle beam focusing and bending magnets, wiggler magnets, and quadrupoles

Optically activated core flow shifting within a focused flow

Janet W. Lou, Carl A. Villarruel, and Ross T. Schermer

Appl. Phys. Lett. 99, 054102 (2011); http://dx.doi.org/10.1063/1.3623443 (3 pages) | Cited 1 time

Online Publication Date: 4 August 2011

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We report on the application of an optical beam to redirect sheathed micro-fluidic flow without direct interaction with the sample. The hydrodynamic properties of the sheath are locally modified due to optical heating, resulting in a spatial shift of the sample flow. We characterize this technique for a range of flow rates and demonstrate up to 100 μm shift at peak flow velocities of 19 mm/s. We also model the temperature and viscosity changes, as well as the flow velocity profiles for a two-fluid flow with different viscosities. The calculated shifts in the flow profile correspond well with the measured shifts.
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47.80.Jk Flow visualization and imaging
47.60.Dx Flows in ducts and channels
07.10.Cm Micromechanical devices and systems
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