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윤성운(Sungwoon Yoon),최철진(Chul Jin Choi),박광명(Kwangmyung Park),안정훈(Jeong Hun An),안원(Won Ahn),김기원(Gi Won Kim),박승기(Seoung Ki Park),이용만(Young Man Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
The first Korean heavy ion linear accelerator, named RAON, will be operating at 2 K. The 2 K temperature can be achieved using superfluid helium (at 2.0 K, 23.4 Torr). In the SRF test facility, superfluid helium at 2 K is produced by the 2K-system which consists of a 2K-module, a warm pump system, and a control system. The 2K-module is a sort of cryomodule to keep the superfluid helium at 2 K. The warm pump system pumps down the vapor pressure of liquid helium and the control system keeps the vapor pressure at 23.4 Torr with a butterfly valve. This paper presents the operation procedure of the 2K-system and the result of cooldown test.
라온 초전도 고주파 시험 시설용 EPICS 기반의 극저온 시험 소프트웨어 개발
윤성운(Sungwoon Yoon),이상일(Sangil Lee),박미정(Mi Jeong Park),박인명(In Myung Park),기태경(Taekyung Ki) 대한기계학회 2020 大韓機械學會論文集B Vol.44 No.8
희귀 동위원소 가속기 시설인, 라온은 초전도 가속관과 초전도 가속 모듈의 성능 시험을 위하여 극저온 설비를 구축하였다. 일반적으로 열부하 측정 시험에서는 헬륨의 엔탈피와 밀도가 필요하다. EPICS를 기반으로 개발된 극저온 시험을 위한 소프트웨어는 측정된 헬륨의 온도와 압력을 통해 실시간으로 헬륨의 물성을 계산할 수 있다. 그리고 최근 헬륨 값의 상승으로 헬륨 저장량을 관리하는 것이 중요하게 되었다. 이 소프트웨어는 헬륨 저장량을 실시간으로 계산하고 저장할 수 있도록 개발되어 매년 혹은 매달 헬륨 손실량을 확인하고 조치할 수 있도록 도와준다. 개발된 소프트웨어를 이용하여 현재까지 진행된 극저온 시험에서 열부하를 실시간으로 모니터링하고 헬륨량을 감시하고 있다. 이 논문은 소프트웨어를 설명하고 결과를 보여준다. Rare isotope accelerator complex for on-line experiments (RAON) requires facilities used in cryogenic tests to validate the performance of superconducting components, such as SRF cavities and cryomodules. Generally, to measure heat loads of the components, a few properties of cryogenic fluids, such as enthalpy and density, should be known. To this end, a cryogenic test software is developed, which is based on EPICS. This software calculates the properties of the fluid in real-time using the temperature and pressure of the fluid, which are measured using sensors. In the facility, a main issue is the management of helium; this is because of the limited supply of helium and its cost, which has almost doubled in the last two years. Thus, the software also includes a real-time helium inventory monitoring function that can easily estimate annual total helium losses and average loss rate per month. This software is validated during a cryogenic test conducted on a valve box. The heat loads are successfully monitored in real-time; further, the total helium inventory is monitored as well. This paper describes the software and shows the test results.
유정현(Junghyun Yoo),윤성운(Sungwoon Yoon),김덕기(Duckgi Kim),김동완(Dongwan Kim),기태경(Taekyung Ki) 대한기계학회 2023 대한기계학회 춘추학술대회 Vol.2023 No.11
SCL3 cryogenic plant had short maintenance period from July 2023 to September 2023. We filled oil for helium compressors, cleaned several filters including inlet filter of cryogenic turbine, inspected pressure safety valves based on KGS regulation and so on. We finally conducted helium conditioning for contaminated location by air. The items for maintenance were decided based on our operation experience for one year. In this paper, the detail of items, issues during maintenance and the result of maintenance will be discussed.
유정현(Junghyun Yoo),윤성운(Sungwoon Yoon),박인명(Inmyung Park),기태경(Tae Kyung Ki) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
A main Terminal box (TBx) for Korean heavy ion accelerator is a facility to connect between two coldboxes and two linear accelerators (LINACs). There are four main roles for TBx; i) cooling and warming up main cryolines in LINACs, ii) checking and controlling the conditions of suppling and recovered Helium to/from LINACs, iii) Separating between two coldboxes and two LINACs, iv) protecting main cryolines in LINACs. We finally finish the construction of TBx which can perform these four roles. In this paper, we mainly discuss about conceptual design and hardware of TBx.
유정현(Junghyun Yoo),윤성운(Sungwoon Yoon),박인명(Inmyung Park),기태경(Tae Kyung Ki) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
A main Terminal box (TBx) for Korean heavy ion accelerator is a facility to connect between two coldboxes and two linear accelerators (LINACs). There are four main roles for TBx; i) cooling and warming up main cryolines in LINACs, ii) checking and controlling the conditions of suppling and recovered Helium to/from LINACs, iii) Separating between two coldboxes and two LINACs, iv) protecting main cryolines in LINACs. We finally finish the construction of TBx which can perform these four roles. In this paper, we mainly discuss about conceptual design and hardware of TBx.