Passive superconducting flux conservers forrotating-magnetic-field-driven field-reversed configurations

C. E. Myers, M. R. Edwards, B. Berlinger, A. Brooks, S. A. Cohen

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The Princeton Field-Reversed Configuration (PFRC) experiment employs an odd-parity rotating-magneticfield (RMF0) current drive and plasma heating system to form and sustain high-β plasmas. For radial confinement, an array of coaxial, internal, passive flux conserver (FC) rings applies magnetic pressure to the plasma while still allowing radio-frequency RMF 0 from external coils to reach the plasma. The 3-ms pulse duration of the present experiment is limited by the skin time yc of its room-temperature copper FC rings. To explore plasma phenomena with longer characteristic times, the pulse duration of the next-generation PFRC-2 device will exceed J00 ms, necessitating FC rings with Tfc 300 ms. In this paper we review the physics of internal, discrete, passive FCs and describe the evolution of the PFRC's FC array. We then detail new experiments that have produced higher-performance FC rings that contain embed- ded high-temperature superconducting (HTS) tapes. Several HTS tape winding configurations have been studied, and a wide range of extended skin times, from 0.4 s to >10 3 s, has been achieved. The new FC rings must carry up to 2.5 kA of current to balance the expected PFRC-2 plasma pressure, so the dependence of the HTS-FC critical current on the winding configuration and operating temperature has also been studied. From these experiments, the key HTS-FC design considerations have been identified and HTS-FC rings with the desired performance characteristics have been produced.

Original languageEnglish (US)
Pages (from-to)86-103
Number of pages18
JournalFusion Science and Technology
Volume61
Issue number1
DOIs
StatePublished - Jan 2012

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

Keywords

  • Field-reversed configuration
  • Flux conserver
  • Rotating magnetic field

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