Multipole analysis for absolute magnetic field measured by multi-probe pulsed-NMR method

Hidehiko Arima, Shuichi Kato, Keisuke Maehata, Kenji Ishibashi, Tatsushi Nakamoto, Takakazu Shintomi

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

For accelerator dipole magnets, the study on multipole coefficients in a local region is useful for understanding magnet characteristics and checking a construction procedure. The multi-probe pulsed-NMR method is a candidate for measurement of the local multipole coefficients. For the absolute fields measured by the multi-probe pulsed-NMR method, a rigorous application of the Fourier expansion is found to yield multipole coefficients. It is made clear that the direction of the dipole field is unable to be determined by the Fourier expansion alone. For estimating alignment accuracy of pulsed-MR probes, the relationship between errors of multipole coefficients and those of probe position is derived by the Fourier expansion method. For applying of multi-probe pulsed-MR method to accelerator dipole magnets, we designed and fabricated a field measuring system using two probes. The probes had MR coils wound around glass ampuls with a diameter of about 1.4 mm. The NMR signal was processed with a phase lock loop circuit to produce the NMR frequency. Dipole field uniformity and multipole coefficients were measured at 0.35 T for a 1.5 m long dipole magnet. It was confirmed that the field data by this NMR system had an accuracy of 10-6.

Original languageEnglish
Pages (from-to)1450-1453
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume10
Issue number1
DOIs
Publication statusPublished - Jan 1 2000

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multipoles
Nuclear magnetic resonance
Magnetic fields
nuclear magnetic resonance
probes
Magnets
dipoles
magnetic fields
magnets
coefficients
Particle accelerators
expansion
accelerators
Plant expansion
estimating
coils
alignment
Glass
Networks (circuits)
glass

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

Multipole analysis for absolute magnetic field measured by multi-probe pulsed-NMR method. / Arima, Hidehiko; Kato, Shuichi; Maehata, Keisuke; Ishibashi, Kenji; Nakamoto, Tatsushi; Shintomi, Takakazu.

In: IEEE Transactions on Applied Superconductivity, Vol. 10, No. 1, 01.01.2000, p. 1450-1453.

Research output: Contribution to journalArticle

Arima, Hidehiko ; Kato, Shuichi ; Maehata, Keisuke ; Ishibashi, Kenji ; Nakamoto, Tatsushi ; Shintomi, Takakazu. / Multipole analysis for absolute magnetic field measured by multi-probe pulsed-NMR method. In: IEEE Transactions on Applied Superconductivity. 2000 ; Vol. 10, No. 1. pp. 1450-1453.
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