Earticle

초록

영어

This study deals with the ferromagnetic shims design based on the spherical harmonic coefficient reduction method. The design method using the sequential search method is an intuitive method and has the advantage of quickly reaching the optimal result. The study was conducted for a 400 MHz all-REBCO magnet, which had difficulty in shimming due to the problem of SCF (screening current induced field). The initial field homogeneity of the magnet was measured to be 233.76 ppm at 20 mm DSV (Diameter Spherical Volume). In order to improve the field homogeneity of the magnet, the ferromagnetic shim with a thickness of 1 mil to 11 mil was constructed by a design method in which sequential search algorithm was applied. As a result, the field homogeneity of the magnet could be significantly improved to 0.24 ppm at 20 mm DSV and 0.05 ppm at 10 mm DSV.

목차

Abstract
1. INTRODUCTION
2. FERROMAGNETIC SHIMS DESIGN
2.1. Spherical harmonics and field mapping
2.2. Ferromagnetic shimming
2.3. Ferro-shims design with sequential search method
3. CASE STUDY ON SHIMMING DESIGN FOR 400 MHz NMR MAGNET
3.1. Field mapping results of the HTS NMR magnet
3.2. Process of the ferromagnetic shims design
3.3. Design result and virtual mapping
4. CONCLUSION
ACKNOWLEDGMENT
REFERENCES

키워드

저자

• Hongmin Yang [ Kunsan National University, Jeonbuk, Gunsan, Korea, Korea Basic Science Institute, Chungbuk, Cheongju, Korea ]
• SangGap Lee [ Korea Basic Science Institute, Chungbuk, Cheongju, Korea ]
• Minchul Ahn [ Kunsan National University, Jeonbuk, Gunsan, 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