Earticle

초록

영어

The lumped-parameter circuit model for a no- insulation (NI) high temperature superconductor (HTS) magnet has been well understood after many experimental and analytic studies over a decade. It successfully explains the non-linear charging behaviors of NI magnets. Yet, recently, multiple groups reported that the post-quench electromechanical behaviors of an NI HTS magnet may not be well explained by the lumped circuit model. The characteristic resistance of an NI magnet is one of the key parameters to characterize the so-called “NI behaviors” of an NI magnet and recently a few groups reported a potential that the characteristic resistance of an NI magnet may substantially vary during a quench. This paper deals with this issue, the increment of contact resistance of the no-insulation (NI) REBCO magnet during a quench and its impact on the post-quench behaviors. A 7 T 78 mm NI REBCO magnet that was previously built by the MIT Francis Bitter Magnet Laboratory was chosen for our simulation to investigate the increment of contact resistance to better duplicate the post-quench coil voltages in the simulation. The simulation results showed that using the contact resistance value measured in the liquid nitrogen test, the magnitude of the current through the coil must be much greater than the critical current. This indicates that the value of the contact resistance should increase sharply after the quench occurs, depending on the lumped circuit model.

목차

Abstract
1. INTRODUCTION
2. 7 T 78 MM MAGNET CONFIGURATION AND PARAMETERS
2.1. Parameters of the REBCO conductor
2.2. Parameters of the Magnet
3. SIMULATION RESULTS & DISCUSSION
3.1. Key Equations: KVL and KCL
3.2. Coil Voltage: Interpolated by Hermite method
3.3. Azimuthal & Radial Current Simulation: by Adopting Measured Characteristic Resistance Value
3.4. Azimuthal Current Simulation: by Adopting Increased Characteristic Resistance Value
4. CONCLUSION
ACKNOWLEDGMENT
REFERENCES

키워드

저자

• Chaemin Im [ Department of Electrical and Computer Engineering, Seoul National University, Seoul, 08826, South Korea ]
• Mincheol Cho [ Department of Electrical and Computer Engineering, Seoul National University, Seoul, 08826, South Korea ]
• Jeseok Bang [ Department of Electrical and Computer Engineering, Seoul National University, Seoul, 08826, South Korea ]
• Jaemin Kim [ Department of Electrical and Computer Engineering, Seoul National University, Seoul, 08826, South Korea ]
• Seungyong Hahn [ Department of Electrical and Computer Engineering, Seoul National University, Seoul, 08826, 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