Development of a small-probe pulsed nuclear magnetic resonance system for measuring magnetic field uniformity

Shuichi Kato, Keisuke Maehata, Kenji Ishibashi, Yoshihisa Wakuta, Takakazu Shintomi

研究成果: ジャーナルへの寄稿記事

抄録

The pulsed nuclear magnetic resonance (NMR) field measurement system is suitable for high-accuracy field homogeneity measurement for accelerator dipole magnets. The measurement has to use NMR probes as small as a few mm in diameter. The coaxial cable connecting the NMR probe and preamplifier has a length of 10 m or more. The coaxial cable has to be treated as a distributed-constant circuit for high-field measurement. We studied the optimum condition of the radio-frequency signal propagation in the coaxial cable, and found that a cable length of nλNMR/2 (n = 1,2,...) gives optimum propagation characteristics. In accordance with this result, we designed and fabricated a prototype field measurement system using pulsed NMR. The use of a phase-locked loop circuit facilitated the measurement of the frequency of the free-induction-decay signal. To confirm the performance of this system, the magnetic field in the 2 T region of the superconducting solenoid magnet was measured with the NMR probe of which the shape was a cylinder of 4 mm in diameter.

元の言語英語
ページ(範囲)1468-1473
ページ数6
ジャーナルReview of Scientific Instruments
68
発行部数3
DOI
出版物ステータス出版済み - 1 1 1997

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Nuclear magnetic resonance
resonance probes
Magnetic fields
coaxial cables
nuclear magnetic resonance
Coaxial cables
probes
magnetic fields
Magnets
magnets
propagation
Networks (circuits)
preamplifiers
Solenoids
Phase locked loops
solenoids
cables
Particle accelerators
homogeneity
radio frequencies

All Science Journal Classification (ASJC) codes

  • Instrumentation

これを引用

Development of a small-probe pulsed nuclear magnetic resonance system for measuring magnetic field uniformity. / Kato, Shuichi; Maehata, Keisuke; Ishibashi, Kenji; Wakuta, Yoshihisa; Shintomi, Takakazu.

:: Review of Scientific Instruments, 巻 68, 番号 3, 01.01.1997, p. 1468-1473.

研究成果: ジャーナルへの寄稿記事

Kato, Shuichi ; Maehata, Keisuke ; Ishibashi, Kenji ; Wakuta, Yoshihisa ; Shintomi, Takakazu. / Development of a small-probe pulsed nuclear magnetic resonance system for measuring magnetic field uniformity. :: Review of Scientific Instruments. 1997 ; 巻 68, 番号 3. pp. 1468-1473.
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