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Innovative Tools for Scientific ResearchInnovative Tools for Scientific Research

Ultra-Low Current Magnets

August 4, 2014 By Steve Short Leave a Comment

Suzaku launches with a Cryomagnetics' superconducting magnet inside! (Photo credit to Scott Porter of NASA)

Suzaku launches with a Cryomagnetics’ superconducting magnet inside!
(Photo credit to Scott Porter of NASA)

On July 10, 2005, the Suzaku (formerly Astro-E2) spacecraft successfully launched from the Uchinoura Space Center in Japan. Suzaku is a collaborative project between the Japan Aerospace Exploration Agency (ISAS/JAXA), and NASA Goddard Space Flight Center.

Suzaku is an astronomy spacecraft used to monitor X-rays emitted by stars, galaxies, and black holes. To complete its mission, Suzaku uses several X-ray detectors, including one called the XRS.

In order for the XRS to operate correctly, its microcalorimeter must be kept at temperature of 60 millikelvin. An adiabatic demagnetization refrigerator (ADR) with a Cryomagnetics’ superconducting magnet installed is used to achieve the ultralow temperature required by XRS. This is believed to be the first superconducting magnet application in space.

Designing and manufacturing a superconducting magnet for this task was demanding. The superconducting magnet needed to be very lightweight yet withstand the stresses of launch. Operating current must be very low (2 amperes), but generate a high magnetic field (2 Tesla). Stray magnetic field must be contained largely within the superconducting magnet itself so the sensitive instruments surrounding it are not affected.

NASA’s specifications for the superconducting magnet were fully met. Success with this project has enabled Cryomagnetics to expand its technology in several areas, including:

  • Ultra-low current superconducting magnets
  • Operation of superconducting magnets in vacuum
  • Cryogen-free and conduction-cooling techniques
  • Quench protection management in vacuum environments
  • Ruggedization of superconducting magnets
  • Active-shielding of superconducting magnets

The original project (Astro-E) was completed in 1999, but the launch vehicle malfunctioned. The original satellite with a Cryomagnetics’ superconducting magnet was destroyed. The Astro-E2, renamed Suzaku, is the replacement system.

For more information about Cryomagnetics and our products, please contact Brian Pollard (865) 482-9551, bpollard@cryomagnetics.com.

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