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Reduction of magnetic field fluctuations in powered magnets for NMR using inductive measurements and sampled-data feedback control

[Display omitted] ► Temporal field fluctuations in powered magnets are unacceptable for NMR. ► Field fluctuations are characterized using inductive and NMR measurements. ► Feedback control provides a significant reduction in field fluctuations. ► Compensator design is guided by the disturbance spect... Full description

Journal Title: Journal of Magnetic Resonance 2011, Vol.212(2), pp.254-264
Main Author: Li, Mingzhou
Other Authors: Schiano, Jeffrey L , Samra, Jenna E , Shetty, Kiran K , Brey, William W
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 1090-7807 ; E-ISSN: 1096-0856 ; DOI: 10.1016/j.jmr.2011.05.010
Link: http://dx.doi.org/10.1016/j.jmr.2011.05.010
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recordid: elsevier_sdoi_10_1016_j_jmr_2011_05_010
title: Reduction of magnetic field fluctuations in powered magnets for NMR using inductive measurements and sampled-data feedback control
format: Article
creator:
  • Li, Mingzhou
  • Schiano, Jeffrey L
  • Samra, Jenna E
  • Shetty, Kiran K
  • Brey, William W
subjects:
  • High-Field Resistive Magnet
  • Hybrid Magnet
  • Temporal Magnetic Field Fluctuations
  • Feedback Control
  • High-Field Resistive Magnet
  • Hybrid Magnet
  • Temporal Magnetic Field Fluctuations
  • Feedback Control
  • Chemistry
  • Physics
ispartof: Journal of Magnetic Resonance, 2011, Vol.212(2), pp.254-264
description: [Display omitted] ► Temporal field fluctuations in powered magnets are unacceptable for NMR. ► Field fluctuations are characterized using inductive and NMR measurements. ► Feedback control provides a significant reduction in field fluctuations. ► Compensator design is guided by the disturbance spectra and system dynamics. Resistive and hybrid (resistive/superconducting) magnets provide substantially higher magnetic fields than those available in low-temperature superconducting magnets, but their relatively low spatial homogeneity and temporal field fluctuations are unacceptable for high resolution NMR. While several techniques for reducing temporal fluctuations have demonstrated varying degrees of success, this paper restricts attention to methods that utilize inductive measurements and feedback control to actively cancel the temporal fluctuations. In comparison to earlier studies using analog proportional control, this paper shows...
language: eng
source:
identifier: ISSN: 1090-7807 ; E-ISSN: 1096-0856 ; DOI: 10.1016/j.jmr.2011.05.010
fulltext: fulltext
issn:
  • 1090-7807
  • 10907807
  • 1096-0856
  • 10960856
url: Link


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titleReduction of magnetic field fluctuations in powered magnets for NMR using inductive measurements and sampled-data feedback control
creatorLi, Mingzhou ; Schiano, Jeffrey L ; Samra, Jenna E ; Shetty, Kiran K ; Brey, William W
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subjectHigh-Field Resistive Magnet ; Hybrid Magnet ; Temporal Magnetic Field Fluctuations ; Feedback Control ; High-Field Resistive Magnet ; Hybrid Magnet ; Temporal Magnetic Field Fluctuations ; Feedback Control ; Chemistry ; Physics
description[Display omitted] ► Temporal field fluctuations in powered magnets are unacceptable for NMR. ► Field fluctuations are characterized using inductive and NMR measurements. ► Feedback control provides a significant reduction in field fluctuations. ► Compensator design is guided by the disturbance spectra and system dynamics. Resistive and hybrid (resistive/superconducting) magnets provide substantially higher magnetic fields than those available in low-temperature superconducting magnets, but their relatively low spatial homogeneity and temporal field fluctuations are unacceptable for high resolution NMR. While several techniques for reducing temporal fluctuations have demonstrated varying degrees of success, this paper restricts attention to methods that utilize inductive measurements and feedback control to actively cancel the temporal fluctuations. In comparison to earlier studies using analog proportional control, this paper shows...
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titleReduction of magnetic field fluctuations in powered magnets for NMR using inductive measurements and sampled-data feedback control
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[Display omitted]

► Temporal field fluctuations in powered magnets are unacceptable for NMR. ► Field fluctuations are characterized using inductive and NMR measurements. ► Feedback control provides a significant reduction in field fluctuations. ► Compensator design is guided by the disturbance spectra and system dynamics.

Resistive and hybrid (resistive/superconducting) magnets provide substantially higher magnetic fields than those available in low-temperature superconducting magnets, but their relatively low spatial homogeneity and temporal field fluctuations are unacceptable for high resolution NMR. While several techniques for reducing temporal fluctuations have demonstrated varying degrees of success, this paper restricts attention to methods that utilize inductive measurements and feedback control to actively cancel the temporal fluctuations. In comparison to earlier studies using analog proportional control, this paper shows...

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abstract

[Display omitted]

► Temporal field fluctuations in powered magnets are unacceptable for NMR. ► Field fluctuations are characterized using inductive and NMR measurements. ► Feedback control provides a significant reduction in field fluctuations. ► Compensator design is guided by the disturbance spectra and system dynamics.

Resistive and hybrid (resistive/superconducting) magnets provide substantially higher magnetic fields than those available in low-temperature superconducting magnets, but their relatively low spatial homogeneity and temporal field fluctuations are unacceptable for high resolution NMR. While several techniques for reducing temporal fluctuations have demonstrated varying degrees of success, this paper restricts attention to methods that utilize inductive measurements and feedback control to actively cancel the temporal fluctuations. In comparison to earlier studies using analog proportional control, this paper shows...

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lad01Journal of Magnetic Resonance