The Transactions of The Korean Institute of Electrical Engineers (전기학회논문지)

The Korean Institute of Electrical Engineers (대한전기학회)
권호 표지

Design and Fabrication of a Conductively Cooled Cryostat by Cryocooler

냉동기 부착형 전도냉각식 Cryostat의 설계 및 제작

  • Published : 2007.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

In order to measure the superconducting transition temperature, the critical current and the alternating current(AC) loss on short samples of high temperature superconductor, a cryocooler cooled cryostat has been designed and built. Two closed-cycle coolers provide cooling with an ultimate sample temperature below 16K. Temperature regulation is provided by 50W of electrical heater that opposes the cooling power from the cold heads. Temperature control feedback is by means of a cernox temperature sensor co-located with the heaters on the second stage of the cold head. Additional temperature sensors are located on the sample mount(B1), on the CVI cold head(B2) and on the Dakin cold head(B3). AC losses on the sample high temperature superconductor were measured at 30K so that the developed device performance was evaluated. In this paper, the design, fabrication and test results on the cryocooler cooled cryostat are presented.

Keywords

References

  1. S. W. Schwenterly, J.A. Demko, J.W. Lue, M.S. Walker, C.T. Reis, D.W. Hazelton, Xin Shi, and M.T. Gardner, 'AC Loss Measurements with a Cryocooled Sample,' IEEE Trans. on Applied Superconductivity, Vol. 11, No.2, pp. 4027-4030, 2001 https://doi.org/10.1109/77.947379
  2. N. Chakraborty, A.V. Volkozub, and A.D. Caplin, 'Bolometric measurement of ac loss in HTS taped: a novel approach of microwatt sensitivity,' Supercond. Sci. Technol. 13, pp. 1062-1066, 2000 https://doi.org/10.1088/0953-2048/13/7/327
  3. C. Traholt, Kruger Olsen, O. Tonnesen, M. Daumling, F. Hansen, C.N. Rasmussen, and D. Wilen, 'Measuring the Current Distribution in a 10 m Long High Temperature Superconducting Cable Conductor,' Physica C 372-376, pp. 1567-1570, 2002 https://doi.org/10.1016/S0921-4534(02)01065-1
  4. Qiuliang Wang, Luguang Yan, Baozhi Zhao, Sousen Song, and Yuanzhong Lei, 'Development of Wide- Bore Conduction -Cooled Superconducting Magnet System for Material Processing Applications,' IEEE Trans. on Applied Superconductivity, Vol. 14, No. 2, pp. 372-375, 2004 https://doi.org/10.1109/TASC.2004.829673
  5. 산업자원부, '전력품질개선용 고온초전도전력저장시스템개발 1차년도 중간보고서', 2005
  6. W. T. Norris, 'Calculation of hysteresis in hard superconductors carrying AC isolated conductors and edges of thin sheets', Journal of Physics D 3: Applied Physics, Vo1.3, pp. 489-507, 1970
  7. M. A. Young, J. A. Demko, M. J. Gouge, M. O. Pace, J. W. Lue, and R. Grabovickic, 'Measurements of the performance of BSCCO HTS tape under magnetic fields with a cryocooled test rig', IEEE Trans. on Applied Superconductivity, Vol. 13, No. 2, pp. 2964-2967, 2003 https://doi.org/10.1109/TASC.2003.812076