Charge breeder for the SPIRAL1 upgrade: Preliminary results

Maunoury, L.; Delahaye, P.; Dubois, M.; Angot, J.; Solé, Patrick; Bajeat, O.; Barton, C. J.; Frigot, R.; Jeanne, A.; Jardin, P.; Kamalou, O.; Lecomte, P.; Osmond, B.; Peschard, G.; Lamy, T.; Savalle, Alain

doi:10.1063/1.4935215

Cited by 16 publications

(20 citation statements)

References 4 publications

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“…by increasing the microwave frequency and, hence, the magnetic field strength, or by using a high-Z buffer gas. Optimizing the capture efficiency by changing the buffer gas to oxygen, for example would, however, deteriorate the breeding efficiency of high charge state Na ions due to unfavorable gas mixing conditions, which was confirmed during the experiments for sodium as well as reported elsewhere for potassium [9]. Altogether, this implies that the breeding efficiency of the light ions could be best improved by increasing the plasma density and optimizing the ion optics of the 1þ ion injection [25].…”

Section: Discussionsupporting

confidence: 68%

“…All experiments described hereafter were performed using helium as a buffer gas for the charge breeder ECR discharge. It has been observed experimentally that helium is superior, in comparison to oxygen for example, for optimizing the breeding efficiencies of high charge state Na and K ions [9]. This is believed to be due to the so-called gas mixing effect [10] i.e.…”

Section: Charge Breedingmentioning

confidence: 99%

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Diagnostics of a charge breeder electron cyclotron resonance ion source helium plasma with the injection ofNa231+ions

Tarvainen

Koivisto

Galatà

et al. 2016

Phys. Rev. Accel. Beams

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This work describes the utilization of an injected 23 Na 1þ ion beam as a diagnostics of the helium plasma of a charge breeder electron cyclotron resonance ion source. The obtained data allows estimating the upper limit for the ion-ion collision mean-free path of the incident sodium ions, the lower limit of ion-ion collision frequencies for all charge states of the sodium ions and the lower limit of the helium plasma density. The ion-ion collision frequencies of high charge state ions are shown to be at least on the order of 1-10 MHz and the plasma density is estimated to be on the order of 10 11 cm −3 or higher. The experimental results are compared to simulations of the 23 Na 1þ capture into the helium plasma. The results indicate that the lower breeding efficiency of light ions in comparison to heavier elements is probably due to different capture efficiencies in which the in-flight ionization of the incident 1þ ions plays a vital role.

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Section: Discussionsupporting

confidence: 68%

Section: Charge Breedingmentioning

confidence: 99%

Diagnostics of a charge breeder electron cyclotron resonance ion source helium plasma with the injection ofNa231+ions

Tarvainen

Koivisto

Galatà

et al. 2016

Phys. Rev. Accel. Beams

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“…Fig. 12 presents the charge breeding efficiencies obtained on the off-line LPSC test bench [25] and in 2018 at SPIRAL 1 [29] for Na, K and Rb alkali ions, with He as support gas. The efficiencies are a factor 2 to 5 higher than those recorded at ISOLDE [12,13].…”

Section: Ecr Charge Breeder Performancesmentioning

confidence: 99%

New exotic beams from the SPIRAL 1 upgrade

Delahaye

Dubois

Maunoury

et al. 2020

Nuclear Instruments and Methods in Physics Research Section B:

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Since 2001, the SPIRAL 1 facility has been one of the pioneering facilities in ISOL techniques for reaccelerating radioactive ion beams: the fragmentation of the heavy ion beams of GANIL on graphite targets and subsequent ionization in the Nanogan ECR ion source has permitted to deliver beams of gaseous elements (He, N, O, F, Ne, Ar, Kr) to numerous experiments. Thanks to the CIME cyclotron, energies up to 20 AMeV could be obtained. In 2014, the facility was stopped to undertake a major upgrade, with the aim to extend the production capabilities of SPIRAL 1 to a number of new elements. This upgrade, which is presently under commissioning, consists in the integration of an ECR booster in the SPIRAL 1 beam line to charge breed the beam of different 1+ sources. A FEBIAD source (the so-called VADIS from ISOLDE) was chosen to be the future workhorse for producing many metallic ion beams. This source was coupled to the SPIRAL 1 graphite targets and tested on-line with different beams at GANIL. The charge breeder is an upgraded version of the Phoenix booster which was previously tested in ISOLDE. It was lately commissioned at LPSC and more recently in the SPIRAL 1 beam lines with stable beams. The upgrade additionally permits the use of other target material than graphite. In particular, the use of fragmentation targets will permit to produce higher intensities than from projectile fragmentation, and thin targets of high Z will be used for producing beams by fusion-evaporation. The performances of the aforementioned ingredients of the upgrade (targets, 1+ source and charge breeder) have been and are still being optimized in the frame of different European projects (EMILIE, ENSAR and ENSAR2). The upgraded SPIRAL 1 facility will provide soon its first new beams for physics and further beam development are undertaken to prepare for the next AGATA campaign. The results obtained during the on-line commissioning period permit to evaluate intensities for new beams from the upgraded facility.

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“…9 The device is now under test at LPSC. 12 The ECR charge breeder for SPES, recently tested at LPSC, has shown very good performances for Rb and Cs ions, 13 with a very low emittance of the charge bred beams and an excellent stability. The EBIS beam debuncher is being commissioned at LPC Caen and has produced the first preliminary results which are reported for the first time in this paper.…”

Section: B Emilie's Experimentsmentioning

confidence: 99%

“…6 As a byproduct, with a low residual pressure in the charge breeder down to a few 10 −8 mbar, the use of the gas mixing technique has been found useful for optimizing the charge breeding of the light ions of interest for the upgraded SPIRAL facility. 12 The SPIRAL 1 charge breeder should alternatively make use of He or O 2 support gas for optimizing the charge breeding efficiencies, charge states, and charge breeding times. In general, the new generation ECR charge breeders, which include the SPES and SPIRAL 1 charge breeders, are catching up with the performances of the EBIS ones for metallic ions as can be attested in Fig.…”

Section: B Improvement Of Performancesmentioning

confidence: 99%