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Current Status of the Heavy-Ion Accelerator Facility RAON
Jongwon Kim,Wookang Kim,Hyun-man JANG,Young Kwon Kim,Ilkyoung SHIN,Bun-sik PARK,Ji-Ho Jang,Jaehong KIM,Sang-il LEE,Suk-jin CHOI,Chul-jin CHOI 한국물리학회 2016 새물리 Vol.66 No.12
The baseline design of the heavy-ion accelerator facility called RAON was completed in 2012, and its construction is scheduled to be completed in 2021. The rare isotope science project (RISP) was organized to establish the facility under the auspices of Institute for Basic Science (IBS). A complex of superconducting (SC) linacs will be used for the accelerations of high-power heavy-ion beams to utilize the technique of in-flight fragmentation for isotope beam production and for the post acceleration of the rare isotope beams produced by using the isotope separation on line (ISOL) method. The ISOL system will be driven by a 70 MeV H$^-$ cyclotron. Many efforts have been directed to developing prototypes of the SC cavities and related components, which are the core parts of the SC linac. Mass production of all the components with proper quality control is a major concern of the project. Recently, a test facility equipped with a 330 W LHe cryoplant was completed, and it has been used to test prototypes of and actual SC-linac components. Progress on RAON construction is described.
Low Temperature Test of HWR Cryomodule
Kim, Heetae,Kim, Youngkwon,Lee, Min Ki,Park, Gunn-Tae,Kim, Wookang The Korean Vacuum Society 2016 Applied Science and Convergence Technology Vol.25 No.3
Low temperature test for half-wave resonator (HWR) cryomodule is performed at the superfluid helium temperature of 2 K. The effective temperature is defined for non-uniform temperature distribution. Helium leak detection techniques are introduced for cryogenic system. Experimental set up is shown to make the low temperature test for the HWR cryomodule. The cooldown procedure of the HWR cryomodule is shown from room temperature to 2 K. The cryomodules is precooled with liquid nitrogen and then liquid helium is supplied to the helium reservoirs and cavities. The pressure of cavity and chamber are monitored as a function of time. The vacuum pressure of the cryomodule is not increased at 2 K, which shows leak-tight in the superfluid helium environment. Static heat load is also measured for the cryomodule at 2.5 K.
Introduction to Helium Leak Detection Techniques for Cryogenic Systems
Kim, Heetae,Chang, Yong Sik,Kim, Wookang,Jo, Yong Woo,Kim, Hyung Jin The Korean Vacuum Society 2015 Applied Science and Convergence Technology Vol.24 No.4
Many welding processes are performed to construct cryogenic system. Leak-tight for the cryogenic system is required at low temperature environment. Helium leak detection techniques are commonly used to find leak for the cryogenic system. The helium leak detection techniques for spraying, sniffing and pressurizing techniques are introduced. High vacuum is also necessary to use helium leak detector. So, types of fluid flow, effective temperature, conductance and pumping speed are introduced for vacuum pumping. Leak test procedure is shown for pipe welding, cryomodule and low temperature test. Cryogenic seals which include copper gasket, helicoflex gasket and indium are investigated.
Introduction to Helium Leak Detection Techniques for Cryogenic Systems
Heetae Kim,Yong Sik Chang,Wookang Kim,Yong Woo Jo,Hyung Jin Kim 한국진공학회(ASCT) 2015 Applied Science and Convergence Technology Vol.24 No.4
Many welding processes are performed to construct cryogenic system. Leak-tight for the cryogenic system is required at low temperature environment. Helium leak detection techniques are commonly used to find leak for the cryogenic system. The helium leak detection techniques for spraying, sniffing and pressurizing techniques are introduced. High vacuum is also necessary to use helium leak detector. So, types of fluid flow, effective temperature, conductance and pumping speed are introduced for vacuum pumping. Leak test procedure is shown for pipe welding, cryomodule and low temperature test. Cryogenic seals which include copper gasket, helicoflex gasket and indium are investigated.
Low Temperature Test of HWR Cryomodule
Heetae Kim,Youngkwon Kim,Min Ki Lee,Gunn-Tae Park,Wookang Kim 한국진공학회(ASCT) 2016 Applied Science and Convergence Technology Vol.25 No.3
Low temperature test for half-wave resonator (HWR) cryomodule is performed at the superfluid helium temperature of 2 K. The effective temperature is defined for non-uniform temperature distribution. Helium leak detection techniques are introduced for cryogenic system. Experimental set up is shown to make the low temperature test for the HWR cryomodule. The cooldown procedure of the HWR cryomodule is shown from room temperature to 2 K. The cryomodules is precooled with liquid nitrogen and then liquid helium is supplied to the helium reservoirs and cavities. The pressure of cavity and chamber are monitored as a function of time. The vacuum pressure of the cryomodule is not increased at 2 K, which shows leak-tight in the superfluid helium environment. Static heat load is also measured for the cryomodule at 2.5 K.
CAE - 시험 Correlation을 통한 내구수명 예측에 관한 연구
조우강(Wookang Cho),고정민(Jungmin Go),신명호(Mungho Sin),이동재(Dongjae Lee),최성진(Sungjin Choi),김헌영(Heonyoung Kim) 한국자동차공학회 2005 한국자동차공학회 Symposium Vol.- No.-
Although durability test of the chassis part is required at automotive development the alternative study has been progressive lead to various fatigue analysis method due to the development cost and time reduction. In this study, correlation of the proto durability test and analysis is investigated and using this result we are going to predict exact fatigue life and crack initiation position without durability test. Lead to comparison of the roll static stiffness test with analysis, reliability of the finite element model is going to insure. The stresslife curve of the product is made up lead to correlation of the roll durability test and analysis and this curve is used to the product design to predict target fatigue life or stress revel.
CAE - 시험 Correlation을 통한 내구수명 예측에 관한 연구
조우강(Wookang Cho),고정민(Jungmin Go),신명호(Mungho Sin),이동재(Dongjae Lee),최성진(Sungjin Choi),김헌영(Heonyoung Kim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Although durability test of the chassis part is required at automotive development the alternative study has been progressive lead to various fatigue analysis method due to the development cost and time reduction. In this study, con-elation of the proto durability test and analysis is investigated and using this result we are going to predict exact fatigue life and crack initiation position without durability test. Lead to comparison of the roll static stiffness test with analysis, reliability of the finite element model is going to insure. The stress-life curve of the product is made up lead to correlation of the roll durability test and analysis and this curve is used to the product design to predict target fatigue life or stress revel.