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A Conceptual Design of a Conduction-Cooled Magnet for a Superconducting Property Measurement System
Sukjin Choi,Seyeon Lee,Joon-Han Bae,Myung-Hwan Sohn,Woo-Seok Kim,Chan Park,Ji-Kwang Lee,Sangjin Lee,Kyeongdal Choi IEEE 2009 IEEE transactions on applied superconductivity Vol.19 No.3
<P>We started a new project to develop the conduction-cooled measurement system for superconducting power apparatus. The measurement system is used to acquire electrical and thermal properties on short HTS tape samples and the system is composed of specimen holder for mounting HTS tape and a magnet for applying magnetic fields externally. The magnet consists of two split racetrack windings and is designed to produce maximum 3 T of center field at 20 K. The temperature of specimen holder can be varied in range from 10 K to 77 K. The field homogeneity, which is calculated the maximum magnetic field divided by the center field, is required less than 0.01 within 10 cm axially and 10 mm radially from origin. We have worked on the conceptual designs of the conduction-cooled magnet for the superconducting characteristic measurement system. The measurement system will be fabricated in near future based on the design parameters presented in this paper.</P>
Sukjin Choi,Joon-Han Bae,Myung-Hwan Sohn,Chan Park,Ji-Kwang Lee,Kyeongdal Choi,Tae Kuk Ko IEEE 2011 IEEE transactions on applied superconductivity Vol.21 No.3
<P>A superconducting property measurement system (SPMS) is used to acquire electrical and thermal properties of short HTS tape samples. The SPMS is composed of a specimen holder for mounting an HTS tape and magnet for applying a magnetic field externally. The magnet consists of two split racetrack windings and is designed to produce maximum 3 T of center field at 20 K. In this paper, an HTS magnet for the SPMS cooled by a cryocooler was designed. A HTS magnet consists of several pancakes winding wound from YBCO CC tape. We report out design for a conduction-cooled magnet using YBCO CC tape. For varying the number of double pancake coils (DPCs) and the bending radius, an electromagnetic field analysis is used. We subsequently find a suitable HTS magnet type for an SPMS. This paper describes the quench protection system for an HTS magnet of the SPMS. The detection of any normal zone must be preceded to protect the HTS magnet. We use simulated protection circuit to estimate the trigger conditions. The presented results in this paper will be verified using fabricated protection circuit.</P>
초전도 특성평가장치용 마그넷의 iron cap에 따른 전자장 해석
최석진(Sukjin Choi),배준한(Joon-Han Bae),손명환(Myung-Hwan Sohn),김우석(Woo-Seok Kim),박찬(Chan Park),이지광(Ji-Kwang Lee),최경달(Kyeongdal Choi),고태국(Tae Kuk Ko) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
초전도 특성평가장치는 외부 인가 자장과 온도를 변화시켜가며 고온 초전도 선재의 특성을 측정할 수 있는 장치이다. 본 논문에서는 먼저 설계된 초전도 특성평가장치용 마그네트에 대한 전자장 해석을 하였고, 이 마그네트에 iron을 설치하였을 때의 전자장 해석을 수행하였다. 전자장 해석을 통하여, iron을 설치하였을 때와 iron을 설치하지 않았을 때의 차이를 파악하도록 하였다. 그리고, iron의 두께에 따라 달라지는 자장 분포를 파악하여 초전도 특성평가장치에 iron을 설치하였을 때의 특성을 파악하도록 하였다.
Measurement of magnetization loss according to the winding pitch of CORC®
Jinwoo Han,Kyeongdal Choi,Woo-Seok Kim,Ji-Kwang Lee 한국초전도저온학회 2021 한국초전도저온공학회논문지 Vol.23 No.4
For the application of HTS wire to AC power equipment, a conductor with high current capacity and low loss is required. CORC®,one of the high-current conductors manufactured using several HTS wires, is made by winding the wires in a spiral on a cylindricalformer. Because the magnetization loss of a CORC®conductor depends on the degree of magnetic coupling between the wiresconstituting the CORC®, it is necessary to know the value of the magnetization loss of the CORC®itself. In order to obtain anaccurate loss value, it is necessary to know the effect of the ratio of the winding pitch of the CORC®conductor in the pickup coilregion sampling the magnetization loss signal. To confirm this effect, we prepare CORC®samples having various winding pitches,and measure and compare the magnetization losses. In addition, the magnetization loss was measured while rotating the CORC®samples and it was examined whether there was a difference in the magnetization loss according to the rotation.
Measurement of magnetization loss according to the winding pitch of CORC®
Jinwoo Han,Kyeongdal Choi,Woo-Seok Kim,Ji-Kwang Lee 한국초전도저온공학회 2021 초전도와 저온공학 Vol.23 No.4
For the application of HTS wire to AC power equipment, a conductor with high current capacity and low loss is required. CORC® , one of the high-current conductors manufactured using several HTS wires, is made by winding the wires in a spiral on a cylindrical former. Because the magnetization loss of a CORC® conductor depends on the degree of magnetic coupling between the wires constituting the CORC® , it is necessary to know the value of the magnetization loss of the CORC® itself. In order to obtain an accurate loss value, it is necessary to know the effect of the ratio of the winding pitch of the CORC® conductor in the pickup coil region sampling the magnetization loss signal. To confirm this effect, we prepare CORC® samples having various winding pitches, and measure and compare the magnetization losses. In addition, the magnetization loss was measured while rotating the CORC® samples and it was examined whether there was a difference in the magnetization loss according to the rotation.