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A REBCO Persistent-Current Switch (PCS): Test Results and Switch Heater Performance.

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Researchers are developing superconducting persistent-current switches (PCS) for high-temperature superconducting (HTS) coils. Initial tests in nitrogen environments show promising results, with a new design targeting low power consumption in liquid helium.

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Area of Science:

  • Superconducting magnet technology
  • Cryogenic engineering

Background:

  • High-temperature superconducting (HTS) coils, such as REBCO pancake coils, require reliable persistent-current switches (PCS) for stable operation.
  • Existing PCS technologies may face challenges in demanding cryogenic environments like liquid helium.

Purpose of the Study:

  • To report preliminary findings on the development of a novel superconducting persistent-current switch (PCS).
  • To evaluate PCS performance in nitrogen environments (77-57 K).
  • To introduce a new PCS heater design optimized for low power consumption (< 1 W) in liquid helium.

Main Methods:

  • Experimental testing of a superconducting persistent-current switch (PCS) in liquid and solid nitrogen (77-57 K).
  • Design and conceptualization of a new PCS heater element for liquid helium operation.

Main Results:

  • Preliminary experimental data from PCS operation in nitrogen environments are presented.
  • A new PCS heater design has been developed with a target power of less than 1 W for liquid helium applications.

Conclusions:

  • The study demonstrates progress in developing PCS for REBCO coils.
  • The new heater design shows potential for efficient operation in liquid helium, crucial for future superconducting applications.