Transverse coupling property of beam from ECR ion sources

Yang, Yao; Yuan, Y. J.; Sun, Limin; Feng, Y. C.; Fang, Xing; Cao, Y.; Zhang, X. Z.; Zhao, H. W.

doi:10.1063/1.4901591

Cited by 9 publications

(3 citation statements)

References 12 publications

(8 reference statements)

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“…Beam emittance of an ECR ion source operating at higher microwave frequency and power, and higher magnetic fields, could be slightly higher but not significantly than at lower microwave frequency and power, and lower magnetic fields. The normalized-rms emittances measured with SECRAL at both 18 and 24 GHz operations are roughly the same as those measured with VENUS and RIKEN-SCECR [97][98][99][100].…”

Section: A Beam Emittancesupporting

confidence: 54%

Intense highly charged ion beam production and operation with a superconducting electron cyclotron resonance ion source

Zhao

Sun

Guo

et al. 2017

Phys. Rev. Accel. Beams

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The superconducting electron cyclotron resonance ion source with advanced design in Lanzhou (SECRAL) is a superconducting-magnet-based electron cyclotron resonance ion source (ECRIS) for the production of intense highly charged heavy ion beams. It is one of the best performing ECRISs worldwide and the first superconducting ECRIS built with an innovative magnet to generate a high strength minimum-B field for operation with heating microwaves up to 24-28 GHz. Since its commissioning in 2005, SECRAL has so far produced a good number of continuous wave intensity records of highly charged ion beams, in which recently the beam intensities of 40 Ar 12þ and 129 Xe 26þ have, for the first time, exceeded 1 emA produced by an ion source. Routine operations commenced in 2007 with the Heavy Ion accelerator Research Facility in Lanzhou (HIRFL), China. Up to June 2017, SECRAL has been providing more than 28,000 hours of highly charged heavy ion beams to the accelerator demonstrating its great capability and reliability. The great achievement of SECRAL is accumulation of numerous technical advancements, such as an innovative magnetic system and an efficient double-frequency (24 þ 18 GHz) heating with improved plasma stability. This article reviews the development of SECRAL and production of intense highly charged ion beams by SECRAL focusing on its unique magnet design, source commissioning, performance studies and enhancements, beam quality and long-term operation. SECRAL development and its performance studies representatively reflect the achievements and status of the present ECR ion source, as well as the ECRIS impacts on HIRFL.

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Section: A Beam Emittancesupporting

confidence: 54%

Intense highly charged ion beam production and operation with a superconducting electron cyclotron resonance ion source

Zhao

Sun

Guo

et al. 2017

Phys. Rev. Accel. Beams

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“…According to Liouville's theorem, 4D emittance is invariant of the motion at constant energy and the coupling between the phase-space planes in LEBT lines are usually considered negligible with good approximation and therefore 2D emittances are constant. Due to the possible beam coupling in the case on non-linear fields, use of ECRIS, solenoid but also hexapole magnet and RF kicker, some inter-plane correlation moments become nonzero and the 2D projected emittances are modified [28][29][30][31][32][33][34][35].…”

Section: Discussionmentioning

confidence: 99%

Transverse emittance measurement in 2D and 4D performed on a Low Energy Beam Transport line: benchmarking and data analysis

et al. 2023

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2D and 4D transverse phase-space of a low-energy ion-beam is measured with two of the most common emittance scanners. The article covers the description of the installation, the setup, the settings, the experiment and the benchmark of the two emittance meters. We compare the results from three series of measurements and present the advantages and drawbacks of the two systems. Coupling between phase-space planes, correlations and mitigation of deleterious effects are discussed. The influence of background noise and aberrations of trace-space figures on emittance measurements and RMS calculations is highlighted, especially for low density beams and halos. A new data analysis method using noise reduction, filtering, and reconstruction of the emittance figure is described. Finally, some basic concepts of phase-space theory and application to beam transport are recalled.

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“…Both experiments and simulations have proven the transverse coupling property of the beam from ECR ion sources [16][17]. The plasma electrode of an ECR ion source is generally located in the vicinity of a local magnetic field maximum, leading to extraction of ions from a strong magnetic field and subsequent beam formation in the descending axial magnetic field (halfsolenoid field).…”

Section: B Transverse Coupling Of the Beam From Ecrmentioning

confidence: 99%

Heavy ion accelerator facility front end design and commissioning

Yang

Sun

Zhai

et al. 2019

Phys. Rev. Accel. Beams

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A new project, high intensity heavy ion accelerator facility (HIAF), is currently under design and construction in China. The HIAF front end, composed of electron cyclotron resonance (ECR) ion sources, low energy beam transport (LEBT) and radio frequency quadrupole (RFQ), will produce and provide beams of ions with a mass up to uranium at a beam energy of 0.5 MeV=u. The typical beam intensity is designed up to 2 emA for the uranium beam with a charge state of 35þ. This paper presents an overall design of the front end for HIAF and discusses several key issues in the design. By modeling the beam extraction from the ECR source, we got a reliable starting beam condition to perform the design. Transverse coupling of the beam from the source was elaborated. To relieve the coupling we implanted two solenoids after the source. Space charge effect in the charge state selection of the ion source was evaluated. An overall space charge compensation degree of no less than 70% was predicted. A beam dynamics simulation was performed by using the initial particle distribution obtained from the extraction modeling. The simulation resulted in development of a beam collimation system in the LEBT to confine the transverse emittance. The RFQ design will follow the development of LEAF-RFQ at Institute of Modern Physics, which has successfully commissioned with several beams and demonstrated as an excellent design. Recent beam commissioning results of LEAF-RFQ will also be presented in this paper.

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Transverse coupling property of beam from ECR ion sources

Cited by 9 publications

References 12 publications

Intense highly charged ion beam production and operation with a superconducting electron cyclotron resonance ion source

Intense highly charged ion beam production and operation with a superconducting electron cyclotron resonance ion source

Transverse emittance measurement in 2D and 4D performed on a Low Energy Beam Transport line: benchmarking and data analysis

Heavy ion accelerator facility front end design and commissioning

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