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Effusive-flow characterization of arbitrary size and geometry target/vapor transport systems: radioactive ion beam applications.
| Content Provider | CiteSeerX |
|---|---|
| Author | Bilheux, J. C. Alton, G. D. Liu, Y. Murray, S. N. Williams, C. L. |
| Abstract | The principal factors that severely limit intensities of short-lived radioactive ion beams produced by the Isotope Separator On-Line (ISdL) technique are time delays due to diffusion of radioactive species from solid or liquid target materials and their effusive-flow transport to the ion source. Although diffusion times can be reduced by proper design of short diffusion length, highly refractory targets, effusive-flow times are more difficult to assess. After diffusion from the target material, the species must travel through the target material and vapor transport system to the ion source. The time required for effusive-flow transport to the ion source depends on the conduction path, chemical reactions between the species and target material and materials of construction as well as the physical size and geometry of the ’ transport system. We have developed a fast-valve (1 ms closing time) for introducing gaseous or vapor-state species into the target/vapor transport/ion source/system that permits measurement of effusive-flow times for any gaseous or vaporous species (chemically active or chemically inactive) through any vapor transport system, independent of size and geometry. Characteristic times are determined from the exponential decay of the momentum analyzed ion beam intensity for the species.during ekfusive-flow through the vapor transport system under evaluation. This report describes the effusive-flow apparatus and presents characteristic time spectra and characteristic effusive-flow time data for noble gases flowing through both serial and parallel-flow target reservoir systems. |
| File Format | |
| Access Restriction | Open |
| Subject Keyword | Radioactive Ion Beam Application Geometry Target Vapor Transport System Arbitrary Size Effusive-flow Characterization Vapor Transport System Ion Source Target Material Effusive-flow Time Effusive-flow Transport Time Delay Short-lived Radioactive Ion Beam Liquid Target Material Diffusion Time Isotope Separator On-line Proper Design Closing Time Noble Gas Vapor-state Specie Ion Beam Intensity Characteristic Time Parallel-flow Target Reservoir System Characteristic Effusive-flow Time Data Effusive-flow Apparatus Conduction Path Radioactive Specie Physical Size Chemical Reaction Short Diffusion Length Transport System Exponential Decay Vaporous Specie Present Characteristic Time Spectrum Principal Factor Refractory Target |
| Content Type | Text |
