Overview of the ISOL facility for the RISP

Abstract

The key feature of the Isotope Separation On-Line (ISOL) facility is its ability to provide highintensity and high-quality beams of neutron-rich isotopes with masses in the range of 80 − 160 by means of a 70-MeV proton beam directly impinging on uranium-carbide thin-disc targets to perform forefront research in nuclear structure, nuclear astrophysics, reaction dynamics and interdisciplinary fields like medical, biological and material sciences. The technical design of the 10-kW and the 35-kW direct fission targets with in-target fission rates of up to 10 14 fissions/s has been finished, and for the development of the ISOL fission-target chemistry an initial effort has been made to produce porous lanthanum-carbide (LaCx) discs as a benchmark for the final production of porous UCx discs. For the production of various beams, three classes of ion sources are under development at RISP (Rare Isotope Science Project), the surface ion source, the plasma ion source (FEBIAD), the laser ion source, and the engineering design of the FEBIAD is in progress for prototype fabrication. The engineering design of the ISOL target/ion source front-end system is also in progress, and a prototype will be used for an off-line test facility in front of the pre-separator. The technical designs of other basic elements at the ISOL facility, such as the RF-cooler, the high-resolution mass separator, and the A/q separator, have been finished, and the results, along with the future plans, are introduced.

α-Particle Transport Test of Korea Broad Acceptance Recoil Spectrometer and Apparatus at RAON

“…Korea Broad Acceptance Recoil spectrometer and Apparatus (KoBRA) is one of the low energy experimental facilities at Rare isotope Accelerator complex for ON-line experiments (RAON). KoBRA is a multi-purpose experimental instrument using stable or rare isotope beams in an energy range of 1 − 40 MeV/nucleon for various low energy nuclear physics studies, such as nuclear structure, reactions, and astrophysics, at Rare Isotope Science Project of the Institute for Basic Science in Korea [1][2][3][4][5][6][7][8]. The installation of KoBRA was completed on June 2021 except for a Wien filter, and the first phase of RAON construction project was completed in December 2022 [9].…”

Achromatic and isochronous lattice design of P2DT bending section in RAON accelerator

“…In the RAON accelerator [1], in general, the In-flight Fragmentation (IF) and Isotope Separation On-Line (ISOL) [2] systems are made use of to generate various isotope beams. Firstly the IF system takes a diver linac which consists of the 28 GHz superconducting electron cyclotron resonance ion source (ECR-IS) [3], the main low energy beam transport (LEBT) section, the 500 keV/u RFQ (radio-frequency quadrupole) accelerator, the medium energy beam transport (MEBT) section [4], the 18.5 MeV/u low energy superconducting linac (SCL1), the charge stripper section (CSS), and the high energy superconducting linac (SCL2).…”

Design of an energy analyzer for highly charged Ions HCI beams

“…The charge breeding process used for EBIS-CB source enable to deliver high beam currents going up to 10 mA. The highly charged ion beam extracted from EBIS charge breeder has low beam quality, due to the higher charge state of ions, with emittance around 40 π.mm.mrad and wide range of energy spread 100∼3000 eV [12]. A typical HCI beam provided by EBIS-CB is presented on figure 3 where the measured charge state distribution for various breeding time of Cs-133 by CARIBU EBIS-CB is presented [13].…”