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Title: Molecular-Flow Properties of RIB Type Vapor-Transport Systems Using a Fast-Valve

The advent of the fast-valve device, described previously, permits measurement of molecular-flow times of chemically active or inactive gaseous species through radioactive ion beam (RIB) target ion source systems, independent of size, geometry and materials of construction. Thus, decay losses of short-half-life RIBs can be determined for a given target/vapor-transport system in advance of on-line operation, thereby ascertaining the feasibility of the system design for successful processing of a given isotope. In this article, molecular-flow-time theory and experimentally measured molecular-flow time data are given for serial- and parallel-coupled Ta metal RIB vapor-transport systems similar to those used at ISOL based RIB facilities. In addition, the effect of source type on the molecular-flow time properties of a given system is addressed, and a chemical passivation method for negating surface adsorption enthalpies for chemically active gaseous species on Ta surfaces is demonstrated.
 [1] ;  [1] ;  [2] ;  [1]
  1. ORNL
  2. Oak Ridge National Laboratory (ORNL)
Publication Date:
OSTI Identifier:
DOE Contract Number:
Resource Type:
Journal Article
Resource Relation:
Journal Name: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms; Journal Volume: 329
Research Org:
Oak Ridge National Laboratory (ORNL); Holifield Radioactive Ion Beam Facility (HRIBF)
Sponsoring Org:
SC USDOE - Office of Science (SC)
Country of Publication:
United States