The development of an ECR charge breeder for KEK-JAERI joint RNB project

Jeong, S. C.; Oyaizu, M.; Tojyo, E.; Kawakami, H.; Ishiyama, H.; Miyatake, H.; Enomoto, K.; Watanabe, Yutaka; Katayama, Ichiro; Nomura, T.; Matsuda, M.; Osa, A.; Ichikawa, Shinichi

doi:10.1016/s0168-583x(02)02107-9

Cited by 8 publications

(2 citation statements)

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“…The charge breeding technique has reached an established stage and presently, in 2007, there are three operational breeders for ISOL-produced radioactive beams: the REXEBIS [1] at REX-ISOLDE (since 2001), the ECRIS breeder at TRIAC [2] (since 2005) and the PHOENIX ECRIS installation [3] at ISOLDE (since 2003); the two former feeding linear post-accelerators. A charge breeder does not need to be followed by a post-accelerator but can also provide highly charged ions to low-energy experiments, such as planned for the TITAN [4] and MATS [5] set-ups dedicated to mass measurement of exotic ions.…”

Section: Introductionmentioning

confidence: 99%

Charge state breeders: On-line results

Wenander

2008

Nuclear Instruments and Methods in Physics Research Section B:

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Section: Introductionmentioning

confidence: 99%

Charge state breeders: On-line results

Wenander

2008

Nuclear Instruments and Methods in Physics Research Section B:

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“…This means they are subject to high magnetic and electric field gradients which can cause steep angles and even the reflection of parts of the beam, thus limiting the acceptance. To improve the injection efficiency for the charge breeding, a stepwise deceleration system for the singly charged ions has been proposed first by Banerje et al 9 and first results on such a system have been reported by Jeong et al 10 Based on this ion optical simulations have been performed with the code SIMION 8.0. The PHOENIX plasma chamber geometry and longitudinal magnetic field have been modeled.…”

Section: Injection Of Ions Into the Charge Breedermentioning

confidence: 99%

The ECRIS charge state breeding project at TRIUMF

Ames

Baartman

Bricault

et al. 2008

Review of Scientific Instruments

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International audienceOn-line ion sources at ISOL facilities normally produce only singly charged ions but efficient accelerators require high charge states. Therefore, for the post acceleration of radioactive ions, charge state breeding is being used or planned to use at most of these facilities. For ISAC at TRIUMF the acceptance of the accelerator requires a maximum A/q value of 30 and if further stripping should be avoided A/q<7. To investigate the charge state breeding process an ECRIS (14 GHz PHOENIX from Pantechnik) has been set-up on a test bench. Singly charged ions have been produced with several ion sources typical for the on-line operation and were injected into the charge breeder. The main purpose of the tests has been the optimization of the efficiency for the charge breeding into the desired charge state. The maximum efficiencies reached so far are up to about 6% for noble gas ions and about 3.5% for alkalines. As ion optics simulations show these values may be improved by further optimization of the injection of the singly charged ions into the ECR plasma. In order to meet the velocity acceptance of the accelerator at different A/q values a two gap acceleration system for the highly charged ions has been installed to allow the source to run at different voltages. As the radioactive ions are produced only in small quantities (single ions up to $10^{10}$ per second) background from ions of the support gas or from residual gas should be minimized. Therefore, clean helium gas has been chosen as a support gas. A good mass resolution is essential for the separation of the desired highly charged ions from background peaks. A combination of magnetic and electrostatic sector fields ensures this and separates scattered or charge exchanged ions from the beam. For the further beam transport to the accelerator cross sections for charge exchange of the highly charged ions with the residual gas have been determined. The results of the test measurements and the planning for the on-line installation will be presented

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