Field performance of an optimized stack of YBCO square "annuli" for a compact NMR magnet

Seungyong Hahn; John Voccio; Stéphane Bermond; Dong Keun Park; Juan Bascuñán; Seok Beom Kim; Tomita Masaru; Yukikazu Iwasa

doi:10.1109/TASC.2010.2103920

Field performance of an optimized stack of YBCO square "annuli" for a compact NMR magnet

Seungyong Hahn, John Voccio, Stéphane Bermond, Dong Keun Park, Juan Bascuñán, Seok Beom Kim, Tomita Masaru, Yukikazu Iwasa

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

The spatial field homogeneity and time stability of a trapped field generated by a stack of YBCO square plates with a center hole (square "annuli") was investigated. By optimizing stacking of magnetized square annuli, we aim to construct a compact NMR magnet. The stacked magnet consists of 750 thin YBCO plates, each 40-mm square and 80-μm thick with a 25-mm bore, and has a Ø10 mm room-temperature access for NMR measurement. To improve spatial field homogeneity of the 750-plate stack (YP750) a three-step optimization was performed: 1) statistical selection of best plates from supply plates; 2) field homogeneity measurement of multi-plate modules; and 3) optimal assembly of the modules to maximize field homogeneity. In this paper, we present analytical and experimental results of field homogeneity and temporal stability at 77 K, performed on YP750 and those of a hybrid stack, YPB750, in which two YBCO bulk annuli, each Ø46 mm and 16-mm thick with a 25-mm bore, are added to YP750, one at the top and the other at the bottom.

Original language	English
Article number	5710667
Pages (from-to)	1632-1635
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	21
Issue number	3 PART 2
DOIs	https://doi.org/10.1109/TASC.2010.2103920
Publication status	Published - Jun 2011

Keywords

Compact NMR
Field cooling
Field homogeneity
Optimization
Temporal stability
Trapped field
YBCO plates

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Electrical and Electronic Engineering

Access to Document

10.1109/TASC.2010.2103920

Cite this

@article{3ad78856d73a4f78905c471cf96db659,

title = "Field performance of an optimized stack of YBCO square {"}annuli{"} for a compact NMR magnet",

abstract = "The spatial field homogeneity and time stability of a trapped field generated by a stack of YBCO square plates with a center hole (square {"}annuli{"}) was investigated. By optimizing stacking of magnetized square annuli, we aim to construct a compact NMR magnet. The stacked magnet consists of 750 thin YBCO plates, each 40-mm square and 80-μm thick with a 25-mm bore, and has a {\O}10 mm room-temperature access for NMR measurement. To improve spatial field homogeneity of the 750-plate stack (YP750) a three-step optimization was performed: 1) statistical selection of best plates from supply plates; 2) field homogeneity measurement of multi-plate modules; and 3) optimal assembly of the modules to maximize field homogeneity. In this paper, we present analytical and experimental results of field homogeneity and temporal stability at 77 K, performed on YP750 and those of a hybrid stack, YPB750, in which two YBCO bulk annuli, each {\O}46 mm and 16-mm thick with a 25-mm bore, are added to YP750, one at the top and the other at the bottom.",

keywords = "Compact NMR, Field cooling, Field homogeneity, Optimization, Temporal stability, Trapped field, YBCO plates",

author = "Seungyong Hahn and John Voccio and St{\'e}phane Bermond and Park, {Dong Keun} and Juan Bascu{\~n}{\'a}n and Kim, {Seok Beom} and Tomita Masaru and Yukikazu Iwasa",

note = "Funding Information: Manuscript received August 03, 2010; accepted November 20, 2010. Date of publication February 10, 2011; date of current version May 27, 2011. This work was supported by the National Institute of Biomedical Imaging and Bioengineering, NIH.",

year = "2011",

month = jun,

doi = "10.1109/TASC.2010.2103920",

language = "English",

volume = "21",

pages = "1632--1635",

journal = "IEEE Transactions on Applied Superconductivity",

issn = "1051-8223",

publisher = "Institute of Electrical and Electronics Engineers Inc.",

number = "3 PART 2",

}

TY - JOUR

T1 - Field performance of an optimized stack of YBCO square "annuli" for a compact NMR magnet

AU - Hahn, Seungyong

AU - Voccio, John

AU - Bermond, Stéphane

AU - Park, Dong Keun

AU - Bascuñán, Juan

AU - Kim, Seok Beom

AU - Masaru, Tomita

AU - Iwasa, Yukikazu

N1 - Funding Information: Manuscript received August 03, 2010; accepted November 20, 2010. Date of publication February 10, 2011; date of current version May 27, 2011. This work was supported by the National Institute of Biomedical Imaging and Bioengineering, NIH.

PY - 2011/6

Y1 - 2011/6

N2 - The spatial field homogeneity and time stability of a trapped field generated by a stack of YBCO square plates with a center hole (square "annuli") was investigated. By optimizing stacking of magnetized square annuli, we aim to construct a compact NMR magnet. The stacked magnet consists of 750 thin YBCO plates, each 40-mm square and 80-μm thick with a 25-mm bore, and has a Ø10 mm room-temperature access for NMR measurement. To improve spatial field homogeneity of the 750-plate stack (YP750) a three-step optimization was performed: 1) statistical selection of best plates from supply plates; 2) field homogeneity measurement of multi-plate modules; and 3) optimal assembly of the modules to maximize field homogeneity. In this paper, we present analytical and experimental results of field homogeneity and temporal stability at 77 K, performed on YP750 and those of a hybrid stack, YPB750, in which two YBCO bulk annuli, each Ø46 mm and 16-mm thick with a 25-mm bore, are added to YP750, one at the top and the other at the bottom.

AB - The spatial field homogeneity and time stability of a trapped field generated by a stack of YBCO square plates with a center hole (square "annuli") was investigated. By optimizing stacking of magnetized square annuli, we aim to construct a compact NMR magnet. The stacked magnet consists of 750 thin YBCO plates, each 40-mm square and 80-μm thick with a 25-mm bore, and has a Ø10 mm room-temperature access for NMR measurement. To improve spatial field homogeneity of the 750-plate stack (YP750) a three-step optimization was performed: 1) statistical selection of best plates from supply plates; 2) field homogeneity measurement of multi-plate modules; and 3) optimal assembly of the modules to maximize field homogeneity. In this paper, we present analytical and experimental results of field homogeneity and temporal stability at 77 K, performed on YP750 and those of a hybrid stack, YPB750, in which two YBCO bulk annuli, each Ø46 mm and 16-mm thick with a 25-mm bore, are added to YP750, one at the top and the other at the bottom.

KW - Compact NMR

KW - Field cooling

KW - Field homogeneity

KW - Optimization

KW - Temporal stability

KW - Trapped field

KW - YBCO plates

UR - http://www.scopus.com/inward/record.url?scp=79957894530&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=79957894530&partnerID=8YFLogxK

U2 - 10.1109/TASC.2010.2103920

DO - 10.1109/TASC.2010.2103920

M3 - Article

AN - SCOPUS:79957894530

SN - 1051-8223

VL - 21

SP - 1632

EP - 1635

JO - IEEE Transactions on Applied Superconductivity

JF - IEEE Transactions on Applied Superconductivity

IS - 3 PART 2

M1 - 5710667

ER -

Field performance of an optimized stack of YBCO square "annuli" for a compact NMR magnet

Abstract

Keywords

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this