Heavy ion accelerator facility front end design and commissioning

Abstract

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.

Progress in nuclear astrophysics of east and southeast Asia

“…Extrapolating theory is being developed at Malaysia and Japan. The IMP group is carrying out a direct measurement using the intense carbon beam from the Low Energy Accelerator Facility (LEAF) [200] while the LUNA collaboration is planning an underground measurement [201]. High-intensity heavy ion beam, efficient detectors with ultra-low background, theoretical studies of the molecular resonances, and fusion reaction theory are needed to achieve a more reliable reaction rate for the astrophysical application.…”

Construction and commissioning of the collinear laser spectroscopy system at BRIF

“…Meanwhile, two next-generation RI beam facilities, i.e. HIAF (High Intensity heavy ion Accelerator Facility) [25] and BISOL (Beijing Isotope-Separation-On-Line neutron-rich beam facility) [19] are currently under construction and planned, respectively, which will offer new opportunities for the exploration of unstable nuclei. As laser spectroscopy apparatus has not yet been established at the RI beam facilities in China, we thus have developed a new CLS system at BRIF, part of which was already tested with the bunched stable ion beams provided by an offline laser ablation ion source, as reported recently in Ref.…”