Earticle

초록

영어

The electrical/thermal stabilities and magnetic field controllability of a no-insulation (NI) high-temperature superconducting magnet are characterized by contact resistance between turn-to-turn layers, and the contact resistance characteristics are determined by properties of conductor surface and winding tension. In order to accurately predict the electromagnetic characteristics of the NI coil in a design stage, it is necessary to control the contact resistance characteristics within the design target parameters. In this paper, the contact resistance and critical current characteristics of a rare-earth barium copper oxide (REBCO) conductor were measured to analyze the effects of surface treatment conditions (roughness and oxidation level) of the copper stabilizer layer in REBCO conductor. The test samples with different surface roughness and oxidation levels were fabricated and conductor surface analysis was performed using scanning electron microscopes, alpha step surface profilers and energy dispersive X-ray spectroscopy. Moreover, the contact resistance and critical current characteristics of the samples were measured using the four-terminal method in a liquid nitrogen impregnated cooling environment. Compared with as-received REBCO conductor sample, the contact resistance values of the REBCO conductors, which were post-treated by the scratch and oxidation of the surface of the copper stabilizer layer, tended to increase, and the critical current values were decreased under certain roughness and oxidation conditions.

목차

Abstract
1. 서론
2. REBCO 도체의 표면 분석
2.1. 분석 시료 제작
2.2. 표면처리 조건에 따른 표면 상태 분석
3. REBCO 도체의 전기적 특성 분석
3.1. 표면처리 조건에 따른 접촉저항
3.2. 표면처리 조건에 따른 임계 전류 측정
4. 결론
ACKNOWLEDGMENT
REFERENCES

키워드

저자

• Y. S. Chae [ Department of Electrical Engineering, Jeju National University, Jeju, South Korea ]
• H. M. Kim [ Department of Electrical Engineering, Jeju National University, Jeju, South Korea ]
• Y. S. Yoon [ Department of Electrical Engineering, Shin Ansan University, Ansan, South Korea ]
• T. W. Kim [ Material Technology Center, Korea Testing Laboratory, Ansan, South Korea ]
• J. H. Kim [ Electric Energy Research Center, Jeju National University, Jeju, South Korea ] Corresponding author
• S. H. Lee [ Electric Energy Research Center, Jeju National University, Jeju, South Korea ] Corresponding author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국초전도·저온논문지 (구 한국초전도저온공학회논문지) [Progress in Superconductivity and Cryogenics]

• 간기

  계간

• pISSN

  1229-3008

• eISSN

  2287-6251

• 수록기간

  1999~2026

• 등재여부

  KCI 등재,SCOPUS

• 십진분류

  KDC 427 DDC 537