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Title: Heavy-ion injector based on an electron cyclotron ion source for the superconducting linear accelerator of the Rare Isotope Science Project

Abstract

The injector for the main driver linear accelerator of the Rare Isotope Science Project in Korea, has been developed to allow heavy ions up to uranium to be delivered to the inflight fragmentation system. The critical components of the injector are the superconducting electron cyclotron resonance (ECR) ion sources, the radio frequency quadrupole (RFQ), and matching systems for low and medium energy beams. We have built superconducting magnets for the ECR ion source, and a prototype with one segment of the RFQ structure, with the aim of developing a design that can satisfy our specifications, demonstrate stable operation, and prove results to compare the design simulation.

Authors:
; ; ; ; ; ; ; ; ;  [1]
  1. Rare Isotope Science Project, Institute for Basic Science, Daejeon 305-811 (Korea, Republic of)
Publication Date:
OSTI Identifier:
22482887
Resource Type:
Journal Article
Resource Relation:
Journal Name: Review of Scientific Instruments; Journal Volume: 87; Journal Issue: 2; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; BEAMS; DESIGN; ECR ION SOURCES; ELECTRON CYCLOTRON-RESONANCE; HEAVY IONS; LINEAR ACCELERATORS; RADIOWAVE RADIATION; SIMULATION; SUPERCONDUCTING MAGNETS

Citation Formats

Hong, In-Seok, E-mail: ishong@ibs.re.kr, Kim, Yong-Hwan, Choi, Bong-Hyuk, Choi, Suk-Jin, Park, Bum-Sik, Jin, Hyun-Chang, Kim, Hye-Jin, Heo, Jeong-Il, Kim, Deok-Min, and Jang, Ji-Ho. Heavy-ion injector based on an electron cyclotron ion source for the superconducting linear accelerator of the Rare Isotope Science Project. United States: N. p., 2016. Web. doi:10.1063/1.4935613.
Hong, In-Seok, E-mail: ishong@ibs.re.kr, Kim, Yong-Hwan, Choi, Bong-Hyuk, Choi, Suk-Jin, Park, Bum-Sik, Jin, Hyun-Chang, Kim, Hye-Jin, Heo, Jeong-Il, Kim, Deok-Min, & Jang, Ji-Ho. Heavy-ion injector based on an electron cyclotron ion source for the superconducting linear accelerator of the Rare Isotope Science Project. United States. doi:10.1063/1.4935613.
Hong, In-Seok, E-mail: ishong@ibs.re.kr, Kim, Yong-Hwan, Choi, Bong-Hyuk, Choi, Suk-Jin, Park, Bum-Sik, Jin, Hyun-Chang, Kim, Hye-Jin, Heo, Jeong-Il, Kim, Deok-Min, and Jang, Ji-Ho. Mon . "Heavy-ion injector based on an electron cyclotron ion source for the superconducting linear accelerator of the Rare Isotope Science Project". United States. doi:10.1063/1.4935613.
@article{osti_22482887,
title = {Heavy-ion injector based on an electron cyclotron ion source for the superconducting linear accelerator of the Rare Isotope Science Project},
author = {Hong, In-Seok, E-mail: ishong@ibs.re.kr and Kim, Yong-Hwan and Choi, Bong-Hyuk and Choi, Suk-Jin and Park, Bum-Sik and Jin, Hyun-Chang and Kim, Hye-Jin and Heo, Jeong-Il and Kim, Deok-Min and Jang, Ji-Ho},
abstractNote = {The injector for the main driver linear accelerator of the Rare Isotope Science Project in Korea, has been developed to allow heavy ions up to uranium to be delivered to the inflight fragmentation system. The critical components of the injector are the superconducting electron cyclotron resonance (ECR) ion sources, the radio frequency quadrupole (RFQ), and matching systems for low and medium energy beams. We have built superconducting magnets for the ECR ion source, and a prototype with one segment of the RFQ structure, with the aim of developing a design that can satisfy our specifications, demonstrate stable operation, and prove results to compare the design simulation.},
doi = {10.1063/1.4935613},
journal = {Review of Scientific Instruments},
number = 2,
volume = 87,
place = {United States},
year = {Mon Feb 15 00:00:00 EST 2016},
month = {Mon Feb 15 00:00:00 EST 2016}
}
  • A 28 GHz electron cyclotron resonance (ECR) ion source is being developed for use as an injector for the superconducting linear accelerator of the Rare Isotope Science Project. Beam extraction from the ECR ion source has been simulated using the KOBRA3-INP software. The simulation software can calculate charged particle trajectories in three dimensional complex magnetic field structures, which in this case are formed by the arrangement of five superconducting magnets. In this study, the beam emittance is simulated to understand the effects of plasma potential, mass-to-charge ratio, and spatial distribution. The results of these simulations and their comparison to experimentalmore » results are presented in this paper.« less
  • The construction of the Californium Rare Ion Breeder Upgrade, a new radioactive beam facility for the Argonne Tandem Linac Accelerator System (ATLAS), is nearing completion. The facility will use fission fragments from a 1 Ci {sup 252}Cf source; thermalized and collected into a low-energy particle beam by a helium gas catcher. In order to reaccelerate these beams, an existing ATLAS electron cyclotron resonance (ECR) ion source was redesigned to function as an ECR charge breeder. Thus far, the charge breeder has been tested with stable beams of rubidium and cesium achieving charge breeding efficiencies of 9.7% into {sup 85}Rb{sup 17+}more » and 2.9% into {sup 133}Cs{sup 20+}.« less
  • A 14 GHz electron-cyclotron-resonance (ECR) ion source has been designed and built at Argonne National Laboratory. The source is a modification of the AECR [D. J. Clark, C. M. Lyneis, and Z. Q. Xie, 14th Particle Accelerator Conference (PAC), IEEE Conference 91 CH3038-7, 1991 (unpublished), p. 2796 and C. M. Lyneis, Z. Q. Zie, D. J. Clark, R. S. Lam, and S. A. Lundgren, 10th International Workshop on ECR Ion Sources, Oak Ridge, ORNL CONF-9011136, 1990 (unpublished), p. 47.] at Berkeley and incorporates the latest results from electron-cyclotron-resonance (ECR) developments to produce intense beams of highly charged ions, including anmore » improved magnetic confinement of the plasma electrons with an axial mirror ratio of 3.5. The aluminum plasma chamber and extraction electrode as well as a biased disk on axis at the microwave injection side donate additional electrons to the plasma, making use of the large secondary electron yield from aluminum oxide. The source is capable of ECR plasma heating using two different frequencies simultaneously to increase the electron energy gain for the production of high charge states. The main design goal is to produce several e{mu}A of at least {sup 238}U{sup 35+} in order to accelerate the beam to coulomb-barrier energies without further stripping. First charge state distributions for gaseous elements have been measured and 210e{mu}A{sup 16}O{sup 7+} has been achieved. A normalized, 90{percent} emittance from 0.1 to 0.2 {pi} mm mrad for krypton and oxygen beam has been found.« less
  • A superconducting magnet for use in an electron cyclotron resonance ion source was developed at the Korea Basic Science Institute. The superconducting magnet is comprised of three solenoids and a hexapole magnet. According to the design value, the solenoid magnets can generate a mirror field, resulting in axial magnetic fields of 3.6 T at the injection area and 2.2 T at the extraction region. A radial field strength of 2.1 T can also be achieved by hexapole magnet on the plasma chamber wall. NbTi superconducting wire was used in the winding process following appropriate techniques for magnet structure. The finalmore » assembly of the each magnet involved it being vertically inserted into the cryostat to cool down the temperature using liquid helium. The performance of each solenoid and hexapole magnet was separately verified experimentally. The construction of the superconducting coil, the entire magnet assembly for performance testing and experimental results are reported herein.« less
  • We have developed a new analytical system that consists of an electron cyclotron resonance ion source (RIKEN 18 GHz ECRIS) and a RIKEN heavy ion linear accelerator (RILAC). This system is called trace element analysis using electron cyclotron resonance ion source and RILAC (ECRIS-RILAC-TEA). ECRIS-RILAC-TEA has several advantages as described in the work of Kidera et al. [AIP Conf. Proc. 749, 85 (2005)]. However, many experimental results during the last several years revealed a few problems: (1) large background contamination in the ECRIS, particularly at the surface of the plasma chamber wall, (2) high counting of the ionization chamber andmore » the data taking system that is monitored by the direct beam from the accelerator, and (3) difficulty in the selection of the pilot sample and pilot beam production from the ECRIS for the purpose of normalization. In order to overcome these problems, we conducted several test experiments over the past year. In this article, we report the experimental results in detail and future plans for improving this system.« less