Earticle

초록

영어

Due to large in-field current carrying capacity and strong mechanical strength, a REBCO wire has been regarded as a viable high temperature superconductor (HTS) option for high field MRI and > 1 GHz (>23.5 T) NMR magnets. However, a REBCO magnet is well known to have an inherent problem of field inhomogeneity, so-called ‘Screening Current induced magnetic Field (SCF)’. Recently, ‘field shaking’ and ‘current overshoot operation’ techniques have been successfully demonstrated to mitigate the SCF and enhance the field homogeneity by experiments. To investigate the effectiveness of current overshooting operation technique, a numerical simulation is conducted for a test REBCO magnet composed of a stack of double pancake coils using ‘2D edge-element magnetic field formulation’ combined with ‘domain homogenization’ scheme. The simulation result demonstrates that an appropriate amount of current overshoot can negate the SCF. To verify the simulation results, current overshoot experiments are conducted for the REBCO magnet in liquid nitrogen. Experimental results also demonstrate the possible application of current overshoot technique to mitigate the SCF and enhance the field homogeneity.

목차

Abstract
1. INTRODUCTION
2. REBCO MAGNET
2.1. Fabrication of the magnet
2.2. Critical current measurement
3. NUMERICAL ANALYSIS OF SCF
3.1. Numerical analysis model
3.2. Numerical analysis results
4. EXPERIMENT
4.1. Experimental set up
4.2. Experimental results
5. DISCUSSION
6. CONCLUTION
ACKNOWLEDGMENT
REFERENCES

키워드

저자

• Changhyung Lee [ School of Mechanical Engineering, Changwon National University, Changwon, Korea, SuperGenics Co. Ltd., Changwon, Korea ]
• Seungyong Hahn [ Department of Electrical and Computer Engineering, Seoul National University, Seoul, Korea ]
• Jeseok Bang [ Department of Electrical and Computer Engineering, Seoul National University, Seoul, Korea ]
• Jeonwook Cho [ Korea Electrotechnology Research Institute (KERI), Changwon, Korea ]
• Seokho Kim [ School of Mechanical Engineering, Changwon National University, Changwon, 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