A Universal Method For Effusive-Flow Characterization of Target/Vapor Transport Systems For RIB Generation

Decay losses associated with the times required for diffusion‐release from ISOL production targets and to effusively‐flow to the ion source are principal means whereby short half‐life radioactive species are lost between initial formation and utilization. We have developed an experimental method that can be used to determine effusive‐flow times of arbitrary geometry target/vapor transport systems. The technique utilizes a fast valve to measure effusive‐flow times as short as 0.1 ms for any chemically active or inactive species through any target system, independent of size, geometry and materials of construction. In this report, we describe the effusive‐flow experimental arrangement and provide time spectra for noble gases through prototype RIB target/vapor‐transport systems.