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Effusive-Flow of Pure Elemental Species in Tubular Transport Systems: Radioactive Ion Beam Applications.

DE2001779792

Publication Date	2001
Personal Author	Bilheux, J. C.
Page Count	3
Abstract	Maximum practically achievable intensities are required for research with accelerated radioactive ion beams (RIBs). Time delays due to diffusion of radioactive species from solid or liquid target materials and their effusive-flow transport to the ion source can severely limit intensities of short-lived radioactive beams, and therefore, such delays must be minimized. An analytical formula has been developed that can be used to calculate characteristic effusive-flow times through tubular transport systems, independent of species, tube material, and operational temperature for ideal cases. Thus, the equation permits choice of materials of construction on a relative basis that minimize transport times of atoms or molecules moving through the system, independent of transport system geometry and size. In this report, we describe the formula and compare results derived by its use with those determined by use of Monte-Carlo techniques.
Keywords	Radioactive ion beams Beam transport Diffusion Ion sources Targets Time delay Beam dynamics Beam holes Equations
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Oak Ridge National Lab., TN.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200125
Contract Number	AC05-96OR22464

Effusive-Flow of Pure Elemental Species in Tubular Transport Systems: Radioactive Ion Beam Applications.

Effusive-Flow of Pure Elemental Species in Tubular Transport Systems: Radioactive Ion Beam Applications.
DE2001779792

Publication Date	2001
Personal Author	Bilheux, J. C.
Page Count	3
Abstract	Maximum practically achievable intensities are required for research with accelerated radioactive ion beams (RIBs). Time delays due to diffusion of radioactive species from solid or liquid target materials and their effusive-flow transport to the ion source can severely limit intensities of short-lived radioactive beams, and therefore, such delays must be minimized. An analytical formula has been developed that can be used to calculate characteristic effusive-flow times through tubular transport systems, independent of species, tube material, and operational temperature for ideal cases. Thus, the equation permits choice of materials of construction on a relative basis that minimize transport times of atoms or molecules moving through the system, independent of transport system geometry and size. In this report, we describe the formula and compare results derived by its use with those determined by use of Monte-Carlo techniques.
Keywords	Radioactive ion beams Beam transport Diffusion Ion sources Targets Time delay Beam dynamics Beam holes Equations
Source Agency	Technical Information Center Oak Ridge Tennessee
Corporate Authors	Oak Ridge National Lab., TN.; Department of Energy, Washington, DC.
Document Type	Conference Proceedings
NTIS Issue Number	200125
Contract Number	AC05-96OR22464