Attempt to generate a strong and uniform magnetic field by face-to-face HTS bulk elements in a magnet system

Tetsuo Oka, Eri Hirayama, Yasuhiro Takahashi, Tomoaki Kanai, Jun Ogawa, Satoshi Fukui, Takao Sato, Kazuya Yokoyama, Takashi Nakamura

Research output: Contribution to journalConference articlepeer-review

5 Citations (Scopus)


A unique experimental attempt aiming to obtain a uniform magnetic field space as required for NMR has been carried out with use of HTS bulk magnets. The magnetic poles were activated as 1.8 T (North) and 1.4 T (South) at 30 K by applyinga pulsed magnetic field up to 7 T, and positioned face-to-face with gaps less than 70 mm. The uniformity of the magnetic field required for detecting the NMR signals isless than 1,500 ppm at more than 0.3 T in the cross sectional plane of 2 x 2 mm2. After thepreliminary trials whichrevealed auniformity of 5,421 ppm at 0.44 T in a70 mm gap, we attached a ferromagnetic iron plate to a magnetic pole surface to change the magnetic field distribution to be concave. The best uniformity of 358 ppm at 1.11 T was obtained at 9 mm distance from the iron plate surface in a gap of 30 mm. It is stated that the concave magnetic field distribution was compensated by the counter conical-shape field, resulting in the uniform field plane.

Original languageEnglish
Pages (from-to)1005-1009
Number of pages5
JournalPhysics Procedia
Publication statusPublished - 2015
Externally publishedYes
Event25th International Cryogenic Engineering Conference and International Cryogenic Materials Conference, ICEC/ICMC 2014 - Enschede, Netherlands
Duration: 2014 Jul 72014 Jul 11


  • Bulk magnet
  • NMR
  • magnetic field distribution
  • pulsed-field magnetization
  • superconductor

ASJC Scopus subject areas

  • General Physics and Astronomy


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