Fast and efficient charge breeding of the Californium rare isotope breeder upgrade electron beam ion source

Abstract

The Electron Beam Ion Source (EBIS), developed to breed Californium Rare Isotope Breeder Upgrade (CARIBU) radioactive beams at Argonne Tandem Linac Accelerator System (ATLAS), is being tested off-line. A unique property of the EBIS is a combination of short breeding times, high repetition rates, and a large acceptance. Overall, we have implemented many innovative features during the design and construction of the CARIBU EBIS as compared to the existing EBIS breeders. The off-line charge breeding tests are being performed using a surface ionization source that produces singly charged cesium ions. The main goal of the off-line commissioning is to demonstrate stable operation of the EBIS at a 10 Hz repetition rate and a breeding efficiency into single charge state higher than 15%. These goals have been successfully achieved and exceeded. We have measured (20% ± 0.7%) breeding efficiency into the single charge state of 28+ cesium ions with the breeding time of 28 ms. In general, the current CARIBU EBIS operational parameters can provide charge breeding of any ions in the full mass range of periodic table with high efficiency, short breeding times, and sufficiently low charge-to-mass ratio, 1/6.3 for the heaviest masses, for further acceleration in ATLAS. In this paper, we discuss the parameters of the EBIS and the charge breeding results in a pulsed injection mode with repetition rates up to 10 Hz.

First two operational years of the electron-beam ion trap charge breeder at the National Superconducting Cyclotron Laboratory

“…Our 39 K and 85 Rb loss-corrected results are in good agreement with the REX EBIS efficiencies, except, again, for 133 Cs. The CARIBU EBIS recently obtained an efficiency of 20% with 133 Cs 28þ [7], which is in close agreement with the REX EBIS result. The deviation of our 133 Cs result appears to be consistent with the broad 133 Cs charge-state distribution that we observe.…”

“…Compared to other techniques such as the use of stripper targets or electron cyclotron resonance ion sources, electron-beam ion sources (EBISes) and EBITs have been increasingly recognized over the past decades as the best alternatives to charge breeding owing to their high efficiencies in single charge states, small (transverse and longitudinal) emittances, and high beam purity. EBIS/T systems are currently in operation at other rare-isotope facilities such as CARIBU (ANL) [7], TITAN (TRIUMF) [8], and ISOLDE (CERN) [9,10]. More, such as CANREB (TRIUMF) [11], RAON/RISP [12], MATS (GSI/FAIR) [13], EURISOL [14], and HIE-ISOLDE (CERN) [15] are under construction or being considered.…”

Measuring the difference in nuclear charge radius of Xe isotopes by EUV spectroscopy of highly charged Na-like ions

“…Na-like ions can be produced in large abundance in EBIT devices, offering the possibility of conducting measurements on radioactive isotopes at existing rare-isotope beam facilities like the NSCL [37] and TITAN/TRIUMF [38]. Present and next-generation facilities where this method could be implemented are CARIBU [39], ISOLDE [40], FRIB [41], RAON/RISP [42], and MATS/FAIR [43].…”