Simulations of Solenoid and Electrostatic Quadrupole Focusing of High Intensity Beams from ECR Ion Source

Zhao, Quantang; Balabin, A.I.; Doléans, M.; Marti, F.; Stetson, J.; Wu, Xiaoyu

doi:10.1109/pac.2005.1590753

Cited by 2 publications

(2 citation statements)

References 2 publications

(1 reference statement)

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“…It also must be run with only a few kilovolts of voltage dc (less than 5 kV) for energy beams up to 60 keV. The suitable solution is a multiplet of electrostatic quadrupole which can provide stronger focus than the Einzel lens [23].…”

Section: Coupling Rfq-hrs: Quadrupole Tripletmentioning

confidence: 99%

Development of a radio-frequency quadrupole cooler for high beam currents

Boussaid

Ban

Qúeḿener

et al. 2017

Phys. Rev. Accel. Beams

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International audienceThe SHIRaC prototype is a recently developed radio-frequency quadrupole (RFQ) beam cooler with an improved optics design to deliver the required beam quality to a high resolution separator (HRS). For an isobaric separation of isotopes, the HRS demands beams with emittance not exceeding 3π mm mrad and longitudinal energy spread ∼1 eV. Simulation studies showed a significant contribution of the buffer gas diffusion, space charge effect and mainly the rf fringe field to degrade the achieved beam quality at the RFQ exit. A miniature rf quadrupole (μRFQ) has been implemented at that exit to remove the degrading effects and provide beams with 1 eV of energy spread and around 1.75π mm mrad of emittance for 4 Pa gas pressure. This solution enables also to transmit more than 60% of the incoming ions for currents up to 1 μA. Detailed studies of this development are presented and discussed in this paper. Transport of beams from SHIRaC towards the HRS has been done with an electrostatic quadrupole triplet. Simulations and first experimental tests showed that more than 95% of ions can reach the HRS. Because SPIRAL-2 beams are of high current and very radioactive, the buffer gas will be highly contaminated. Safe maintenance of the SHIRaC beam line needs exceptional treatment of radioactive contaminants. For that, special vinyl sleep should be mounted on elements to be maintained. A detailed maintenance process will be presented

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Section: Coupling Rfq-hrs: Quadrupole Tripletmentioning

confidence: 99%

Development of a radio-frequency quadrupole cooler for high beam currents

Boussaid

Ban

Qúeḿener

et al. 2017

Phys. Rev. Accel. Beams

View full text Add to dashboard Cite

show abstract

“…With an additional correction for the axis rotation caused by solenoid fields, one essentially images an object that in reality never existed: an uncorrelated, "round" beam. This proposed scheme consists of replacing the triplet with an electrostatic doublet-octupole-doublet device followed by a stronger magnetic sextupole just above the analysis magnet [6]. (An electrostatic sextupole was considered but the voltages required would be uncomfortably high.)…”

Section: Models and Future Directionmentioning

confidence: 99%

A Comparison of Electrostatic and Magnetic Focusing of Mixed Species Heavy Ion Beams at NSCL/MSU

Stetson

Machicoane

Marti

et al.

Proceedings of the 2005 Particle Accelerator Conference

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Experience at the National Superconducting Cyclotron Laboratory has shown the first focusing element after the electron cyclotron resonance ion source (ECRIS), before the beam is analyzed by a magnetic dipole, to be critical to subsequent beam transport and matching. Until 2004, both ion sources at the NSCL used a solenoid as this first focusing element. Observation of hollow beam formation led to further analysis and the decision to replace the solenoid with an electrostatic quadrupole triplet on a test basis [1]. Substantial increases in net cyclotron output were achieved, leading us to adopt electrostatic quadrupole focusing as the permanent configuration. In addition, a sextupole magnet was installed in this beam line. Motivations for these changes and results of operating experience are discussed.

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Simulations of Solenoid and Electrostatic Quadrupole Focusing of High Intensity Beams from ECR Ion Source

Cited by 2 publications

References 2 publications

Development of a radio-frequency quadrupole cooler for high beam currents

Development of a radio-frequency quadrupole cooler for high beam currents

A Comparison of Electrostatic and Magnetic Focusing of Mixed Species Heavy Ion Beams at NSCL/MSU

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