Earticle

초록

영어

This paper proposes a center field compensation system using PID control with auto-tuning to improve the temporal stability of high-temperature superconducting (HTS) magnets. The proposed control system is designed to mitigate magnetic field drift induced by screening currents, as well as fluctuations resulting from power supply ripple in HTS magnets. Various auto-tuning techniques were implemented and evaluated to optimize the controller gains, thereby improving the performance of the field compensation system. A background coil, simulating a HTS coil, and a central magnetic field compensation coil were fabricated, and experiments were carried out to compare the performance of each auto-tuning method based on Settling Time and %Overshoot. Experimental evaluation of the compensation coil demonstrated that the Cohen-Coon tuning method is the most effective for central magnetic field compensation. Current distortions, replicating drift caused by screening currents in HTS magnets and fluctuations from the power supply ripple, were applied to the background coil. Using the proposed method, the central magnetic field was successfully compensated, significantly enhancing the temporal stability of the magnet. After successful validation of the auto-tuning-based central magnetic field compensation technique, a Z0 compensation coil for the 400 MHz (9.4 T) HTS NMR magnet was designed and fabricated. Applying the proposed system to HTS NMR magnets is expected to significantly enhance the temporal stability of the magnetic field.

목차

Abstract
1. INTRODUCTION
2. CENTER FIELD COMPENSATION METHOD FOR HTS MAGNETS
2.1. Concept of the center field compensation employing PID Control
2.2. PID Gain Optimization through Auto-tuning
3. IMPLEMENTATION OF A CENTER FIELDCOMPENSATION SYSTEM USING AUTO-TUNING TECHNIQUES
3.1. Overall System Design and Configuration
3.2. Selection of the optimal auto-tuning method suitable for current control in the compensation coil system
3.3. Experimental Results of the center field compensation using the proposed method
4. APPLICATION OF THE PROPOSED COMPENSATION COIL CONTROL TECHNIQUE FOR 400 MHZ (9.4 T) HTS NMR MAGNETS
5. CONCLUSION
ACKNOWLEDGMENT
REFERENCES

키워드

저자

• B. Seo [ Korea University of Technology and Education (KOREATECH), Cheonan, Korea ]
• J. Han [ Korea University of Technology and Education (KOREATECH), Cheonan, Korea ]
• J. Y. Jang [ Korea University of Technology and Education (KOREATECH), Cheonan, 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