The ReA electron-beam ion trap charge breeder for reacceleration of rare isotopes

Lapierre, A.; Schwarz, S.; Kittimanapun, Kritsada; Fogleman, Jesse; Krause, S.; Nash, S.; Rencsok, R.; Tobos, L.; Perdikakis, G.; Portillo, M.; Rodríguez, José A.; Wittmer, W.; Wu, Xiaoyu; Bollen, G.; Leitner, D.; Syphers, M.; team, ReA

doi:10.1063/1.4802378

Cited by 6 publications

(6 citation statements)

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“…[5][6][7]. Unlike the REX-EBIS system at the REX-ISOLDE (Radioactive beam EXperiment -Isotope Separator On-Line DEvice) facility, which uses pulsed injection, the ReA EBIT uses a continuous mode during which beams are continuously injected between two extraction pulses.…”

Section: The Rea Ebit Charge Breedermentioning

confidence: 99%

First charge breeding of a rare-isotope beam with the electron-beam ion trap of the ReA post-accelerator at the National Superconducting Cyclotron Laboratory

Lapierre

Schwarz

Baumann

et al. 2013

Review of Scientific Instruments

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An electron-beam ion trap (EBIT) charge breeder is being brought into operation at the National Superconducting Cyclotron Laboratory at Michigan State University. The EBIT is part of the ReA post-accelerator for reacceleration of rare isotopes, which are thermalized in a gas "stopping" cell after being produced at high energy by projectile fragmentation. The ReA EBIT has a distinctive design; it is characterized by a high-current electron gun and a two-field superconducting magnet to optimize the capture and charge-breeding efficiency of continuously injected singly charged ion beams. Following a brief overview of the reaccelerator system and the ReA EBIT, this paper presents the latest commissioning results, particularly, charge breeding and reacceleration of the highly charged rare isotopes, (76)Ga(24 +, 25 +).

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Section: The Rea Ebit Charge Breedermentioning

confidence: 99%

First charge breeding of a rare-isotope beam with the electron-beam ion trap of the ReA post-accelerator at the National Superconducting Cyclotron Laboratory

Lapierre

Schwarz

Baumann

et al. 2013

Review of Scientific Instruments

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“…Over the last decade, their EBIS has demonstrated efficiencies as high as 23%, and this includes the efficiency of the REXTRAP which prepares the ions for injection into the EBIS. Two new data points have been added to this grapha potassium beam produced by the MSU ReA EBIT in 2013 [20] and a cesium beam recently produced by the EBIS at Argonne [21].…”

Section: Ebis Charge Breedingmentioning

confidence: 99%

On-line charge breeding using ECRIS and EBIS

Vondrasek

2016

Nuclear Instruments and Methods in Physics Research Section B:

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The efficient and rapid production of a high-quality, pure beam of highly charged ions is at the heart of any radioactive ion beam facility. Whether an electron cyclotron resonance (ECR) ion source or an electron beam ion source (EBIS) is used to produce these highly charged ions, their operating characteristics will set the boundaries on the range of experiments which can be performed. In addition, time structure and duty cycle have to be considered when defining the operating parameters of the accelerator system as a whole. At Argonne National Laboratory (ANL), an ECR charge breeder was developed as part of the Californium Rare Ion Breeder Upgrade (CARIBU) program. The charge breeding efficiency and high charge state production of the source is at the forefront of ECR charge breeders, but its overall performance as part of the accelerator system is limited by pervasive background and relatively long breeding times. As such, an EBIS charge breeder has been developed and is running in an off-line configuration. It has already demonstrated good breeding efficiencies, shorter residence times, and reduced background and is scheduled to replace the ECR charge breeder in late 2015. The resultant change in duty cycle and time structure necessitates changes to the overall operation of the facility. The experiences with these breeders, as well as from several other facilities which already utilize an ECR or EBIS for charge breeding, help to define the operational characteristics of each technologytheir strengths, their weaknesses, and the possible paths to improvement.

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“…The ReA post-accelerator of rare isotopes at the National Superconducting Cyclotron Laboratory (NSCL), located at Michigan State University (MSU), currently accelerates beams up to ∼6 MeV=u for light ions and ∼3 MeV=u for heavy ions (see [1][2][3][4][5] and Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

“…Commissioning of the ReA EBIT, in its final configuration with the superconducting magnet, started with injection of continuous beams in late 2010. First reacceleration of stable-isotope beams produced from injected gas was realized in 2012 [3]. Reacceleration of stable-isotope beams injected from the thermalized-beam area followed in early 2013 [3,16].…”

Section: Introductionmentioning

confidence: 99%

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

Lapierre

Bollen

Crisp

et al. 2018

Phys. Rev. Accel. Beams

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The electron-beam ion trap (EBIT) charge breeder of the ReA post-accelerator, located at the National Superconducting Cyclotron Laboratory (Michigan State University), started on-line operation in September 2015. Since then, the EBIT has delivered many pilot beams of stable isotopes and several rare-isotope beams. An operating aspect of the ReA EBIT is the breeding of high charge states to reach high reaccelerated beam energies. Efficiencies in single charge states of more than 20% were measured with 39 K 15þ , 85 Rb 27þ , 47 K 17þ , and 34 Ar 15þ. Producing high charge states demands long breeding times. This reduces the ejection frequency and, hence, increases the number of ions ejected per pulse. Another operating aspect is the ability to spread the distribution in time of the ejected ion pulses to lower the instantaneous rate delivered to experiments. Pulse widths were stretched from a natural 25 μs up to ∼70 ms. This publication reviews the progress of the ReA EBIT system over the years and presents the results of charge-breeding efficiency measurements and pulse-stretching tests obtained with stable-and rare-isotope beams. Studies performed with high sensitivity to identify and quantify stable-isotope contaminants from the EBIT are also presented, along with a novel method for purifying beams.

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The ReA electron-beam ion trap charge breeder for reacceleration of rare isotopes

Cited by 6 publications

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First charge breeding of a rare-isotope beam with the electron-beam ion trap of the ReA post-accelerator at the National Superconducting Cyclotron Laboratory

First charge breeding of a rare-isotope beam with the electron-beam ion trap of the ReA post-accelerator at the National Superconducting Cyclotron Laboratory

On-line charge breeding using ECRIS and EBIS

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

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