Demonstration of closed shell breeding of cesium ions with an electron beam ion source

Vondrasek, R.; McLain, J.; Scott, R.

doi:10.1063/5.0239631

Demonstration of closed shell breeding of cesium ions with an electron beam ion source

Journal Article · Thu Apr 17 04:00:00 EDT 2025 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/5.0239631· OSTI ID:3003243

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Argonne National Laboratory (ANL), Argonne, IL (United States)

An electron beam ion source serves as a charge breeder for the Californium Rare Isotope Breeder Upgrade (CARIBU) at the Argonne Tandem Linac Accelerator System (ATLAS). The source accepts radioactive beams of 1+ or 2+ ions and raises their charge state for post-acceleration by ATLAS. The efficiency of this process impacts the length of each experiment and, hence, the type and number of experiments that can be run in each program cycle. Recent efforts to improve the charge breeding efficiency for the 80 < A < 160 species typical of CARIBU have focused on utilizing the closed shell breeding technique. Here, with this technique, the electron beam energy is manipulated to take advantage of the large gap in ionization energies at shell closures and selectively populate a single charge state. Charge breeding studies with stable cesium ions have demonstrated an absolute efficiency of 72% for Cs²⁷⁺ and a total efficiency of 93%. The Cs²⁷⁺ efficiency result represents a factor of 3 improvement over the previous best charge breeding result of 23% for Cs²⁷⁺.

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 3003243

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 4 Vol. 96; ISSN 1089-7623; ISSN 0034-6748

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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