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Development of an EBIS charge breeder for the Rare Isotope Science Project
Son, Hyock-Jun,Park, Young-Ho,Kondrashev, Sergey,Kim, Jongwon,Lee, Bong Ju,Chung, Moses Elsevier 2017 Nuclear instruments & methods in physics research. Vol.408 No.-
<P><B>Abstract</B></P> <P>In Korea, a heavy ion accelerator facility called RAON is being designed to produce various rare isotopes for the Rare Isotope Science Project (RISP) (Jeong, 2016) [1], (Moon, 2014) [2]. This facility is designed to use both In-flight Fragment (IF) and Isotope Separation On-Line (ISOL) techniques in order to produce a wide variety of RI beams for nuclear physics experiments. An Electron Beam Ion Source (EBIS) will be used for charge breeding of Rare Isotope (RI) beams in the ISOL system. The charge-to-mass ratio (q/A) of the RI beams after charge breeding is ≥1/4. The highly charged RI beams will be accelerated by a linac post-accelerator and delivered to a low energy (∼18MeV/u) experimental hall or the IF system. The RAON EBIS will use a 3A electron gun and a 6T superconducting solenoid for high capacity, high efficiency, and short breeding time. In front of the charge breeder, an RFQ cooler-buncher will be used to deliver a bunched beam with small emittance to the EBIS charge breeder. The main design of the RAON EBIS has been carried out on the basis of several beam analyses and technical reviews. In this paper, current progress of the development of the RAON EBIS charge breeder will be presented.</P>
Construction of a Time-Of-Flight System for Beams Charge-Bred by using the Electron Beam Ion Source
Hao-Lin Liu,Hyock-Jun Son,Young-Ho Park,Taeksu Shin,Jongwon Kim 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.7
A time-of-flight (TOF) system adopting single reflection has been constructed to identify the charge states of ions charge-bed by using the electron beam ion source (EBIS). The reflection allows for time focusing of the system in a compact manner. The EBIS under construction will enhance the charge states of rare isotopes produced by isotope separation on line (ISOL) so as to utilize the superconducting post linear accelerator efficiently. The TOF system consists of an ion-gate, reflection electrodes and multi-channel plates (MCP) detector. The maximum voltage on ions is 20 kV, and the beam optics design was performed using SIMION. In the front end of the TOF an ion gate is located to produce a single 5- to 10-ns pulse operating at a maximum voltage of ±1 kV. The circuit of the fast switching system, which converts -1 kV to 1 kV in a few ns, was simulated for an equivalent circuit of the gate by using LTspice. The TOF system is being fabricated and will be connected to a Cs ion source for initial beam tests with Cs1+ mixed with background ions.
박영호(Young-Ho Park),손혁준(Hyock Jun Son) 한국진공학회 2018 진공 이야기 Vol.5 No.3
EBIS charge breeder will be installed at the ISOL beam line to boost the charge state of the ions and accommodate the input beam requirement of 10keV/u for the superconducting linear accelerator of RAON. Developing EBIS charge breeder requires special techniques related to high voltage, ultra high vacuum, large electron beam current, very strong magnetic field, and precise beam alignment etc. In this paper, we describe the operation principle of EBIS charge breeder and the current development status of the RAON EBIS.