Novel Attempt to Create Uniform Magnetic-Field Space Generated by Face-to-Face Settled HTS Bulk Magnets
-
- OKA Tetsuo
- Faculty of Engineering, Niigata University
-
- ICHIJU Kana
- Faculty of Engineering, Niigata University
-
- HIGA Kazuya
- Faculty of Engineering, Niigata University
-
- FUKUI Satoshi
- Faculty of Engineering, Niigata University
-
- OGAWA Jun
- Faculty of Engineering, Niigata University
-
- SATO Takao
- Faculty of Engineering, Niigata University
-
- YOKOYAMA Kazuya
- Electrical and Electronic Engineering Course, Division of Electrical and Electronic Engineering, Ashikaga Institute of Technology
-
- NAKAMURA Takashi
- Molecular Characterization Team, Technology Platform Division, RIKEN Center for Sustainable Resource Science (CSRS), RIKEN
Bibliographic Information
- Other Title
-
- 対向配置した高温超伝導バルク磁石を用いた均一な磁場空間を生成する新たな試み
- タイコウ ハイチ シタ コウオン チョウデンドウ バルク ジシャク オ モチイタ キンイツ ナ ジバ クウカン オ セイセイ スル アラタ ナ ココロミ
Search this article
Abstract
<p>Various experimental attempts have been made to obtain a uniform magnetic field in the space between face-to-face HTS bulk magnets that could possibly be utilized as NMR magnets. In general, the magnetic fields emitted from the magnetic pole surfaces containing HTS bulk magnets are characterized as non-uniform field distributions. Since the NMR magnets require highly uniform magnetic-field spaces, it has been assumed to be difficult to form uniform magnetic-field spaces between magnetic poles placed face-to-face. The authors modified the shapes of the magnetic-field distribution from convex to concave by attaching ferromagnetic iron plates to the pole surfaces. The magnets were then set face-to-face with various gaps of 30-70 mm, and the experimental data on magnetic-field uniformity was precisely measured in the space. In order to detect the NMR signals, the target performance for uniformity was set as 1,500 ppm throughout the 4-mm span on the x-axis, which is equivalent to performance in the past when the world's first detection of NMR signals was observed in the bore of hollow-type HTS bulk magnets. When we combined the concave and convex field distributions to compensate the uneven field distributions, the data of the best uniformity reached 358 ppm and 493 ppm in the 30 mm and 50 mm gaps, respectively, which exceeded the target value for the purpose of detecting the NMR signals within the space. Furthermore, it was shown that the field distributions change from concave to convex shape without any change at 1.1 T in the range from 7 to 11 mm in the 30-mm gap, indicating that the distributions are uniform. This suggests the possibility that the uniform magnetic-field space between the HTS bulk magnets set face-to-face expands.</p>
Journal
-
- TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan)
-
TEION KOGAKU (Journal of Cryogenics and Superconductivity Society of Japan) 52 (1), 38-43, 2017
CRYOGENICS AND SUPERCONDUCTIVITY SOCIETY OF JAPAN
- Tweet
Keywords
Details 詳細情報について
-
- CRID
- 1390282679590936064
-
- NII Article ID
- 130005241845
-
- NII Book ID
- AN00333419
-
- ISSN
- 18800408
- 03892441
-
- NDL BIB ID
- 027861798
-
- Text Lang
- ja
-
- Data Source
-
- JaLC
- NDL
- Crossref
- CiNii Articles
-
- Abstract License Flag
- Disallowed