Earticle

초록

영어

Here we present the comparative experimental study of the stability of the superconducting state in 4 mm YBCO tapes with copper lamination against local heat disturbances at 77 K. The samples are either directly cooled by immersing a bare YBCO tape into a liquid nitrogen pool or operate in nearly-adiabatic conditions when the tape is covered by a 0.6 mm layer of Kapton insulation. Main quench characteristics, i.e. minimum quench energies (MQEs) and normal zone propagation (NZP) velocities for both samples are measured and compared. Minimum NZP currents are determined by a low ohmic resistor technique eligible for obtaining V - I curves with a negative differential resistance. The region of transport currents satisfying the stationary stability criterion is found for the different cooling conditions. Finally, we use the critical temperature margin as a universal scaling parameter to compare the MQEs obtained in this work for YBCO tapes at 77 K with those taken from literature for low-temperature superconductors in vacuum at 4.2 K, as well as for MgB2 wires cooled with a cryocooler down to 20 K.

목차

Abstract
1. INTRODUCTION
2. SAMPLES
3. TEST RIG
4. RESULTS AND DISCUSSION
4.1. Minimum normal zone propagation currents
4.2. Minimum quench energies.
4.3. Minimum lengths of the normal zone propagation.
4.4. Normal zone propagation velocities.
4.5. Comparison to other superconductors.
5. CONCLUSION
ACKNOWLEDGMENT
REFERENCES

키워드

저자

• S. L. Kruglov [ National Research Centre “Kurchatov Institute”, Moscow, Russian Federation ]
• A. V. Polyakov [ National Research Centre “Kurchatov Institute”, Moscow, Russian Federation ]
• D. I. Shutova [ National Research Centre “Kurchatov Institute”, Moscow, Russian Federation ] Corresponding Author
• D. A. Topeshkin [ Moscow State Budgetary Institution of General Secondary Education «School 1574» ]

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