NMR spectroscopy up to 35.2 T using a series-connected hybrid magnet

Zhehong Gan, Ivan Hung, Xiaoling Wang, Joana Paulino, Gang Wu, Ilya M. Litvak, Peter L. Gor'kov, William W. Brey, Pietro Lendi, Jeffrey Louis Schiano, Mark D. Bird, Iain R. Dixon, Jack Toth, Gregory S. Boebinger, Timothy A. Cross

    Research output: Contribution to journalArticle

    27 Citations (Scopus)

    Abstract

    The National High Magnetic Field Laboratory has brought to field a Series-Connected Hybrid magnet for NMR spectroscopy. As a DC powered magnet it can be operated at fields up to 36.1 T. The series connection between a superconducting outsert and a resistive insert dramatically minimizes the high frequency fluctuations of the magnetic field typically observed in purely resistive magnets. Current-density-grading among various resistive coils was used for improved field homogeneity. The 48 mm magnet bore and 42 mm outer diameter of the probes leaves limited space for conventional shims and consequently a combination of resistive and ferromagnetic shims are used. Field maps corrected for field instabilities were obtained and shimming achieved better than 1 ppm homogeneity over a cylindrical volume of 1 cm diameter and height. The magnetic field is regulated within 0.2 ppm using an external 7Li lock sample doped with paramagnetic MnCl2. The improved field homogeneity and field regulation using a modified AVANCE NEO console enables NMR spectroscopy at 1H frequencies of 1.0, 1.2 and 1.5 GHz. NMR at 1.5 GHz reflects a 50% increase in field strength above the highest superconducting magnets currently available. Three NMR probes have been constructed each equipped with an external lock rf coil for field regulation. Initial NMR results obtained from the SCH magnet using these probes illustrate the very exciting potential of ultra-high magnetic fields.

    Original languageEnglish (US)
    Pages (from-to)125-136
    Number of pages12
    JournalJournal of Magnetic Resonance
    Volume284
    DOIs
    StatePublished - Nov 1 2017

    Fingerprint

    Magnets
    Nuclear magnetic resonance spectroscopy
    Magnetic Fields
    Magnetic Resonance Spectroscopy
    magnets
    nuclear magnetic resonance
    Shims
    Magnetic fields
    homogeneity
    spectroscopy
    Nuclear magnetic resonance
    magnetic fields
    probes
    coils
    consoles
    near Earth objects
    Superconducting magnets
    superconducting magnets
    inserts
    leaves

    All Science Journal Classification (ASJC) codes

    • Biophysics
    • Biochemistry
    • Nuclear and High Energy Physics
    • Condensed Matter Physics

    Cite this

    Gan, Z., Hung, I., Wang, X., Paulino, J., Wu, G., Litvak, I. M., ... Cross, T. A. (2017). NMR spectroscopy up to 35.2 T using a series-connected hybrid magnet. Journal of Magnetic Resonance, 284, 125-136. https://doi.org/10.1016/j.jmr.2017.08.007
    Gan, Zhehong ; Hung, Ivan ; Wang, Xiaoling ; Paulino, Joana ; Wu, Gang ; Litvak, Ilya M. ; Gor'kov, Peter L. ; Brey, William W. ; Lendi, Pietro ; Schiano, Jeffrey Louis ; Bird, Mark D. ; Dixon, Iain R. ; Toth, Jack ; Boebinger, Gregory S. ; Cross, Timothy A. / NMR spectroscopy up to 35.2 T using a series-connected hybrid magnet. In: Journal of Magnetic Resonance. 2017 ; Vol. 284. pp. 125-136.
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    abstract = "The National High Magnetic Field Laboratory has brought to field a Series-Connected Hybrid magnet for NMR spectroscopy. As a DC powered magnet it can be operated at fields up to 36.1 T. The series connection between a superconducting outsert and a resistive insert dramatically minimizes the high frequency fluctuations of the magnetic field typically observed in purely resistive magnets. Current-density-grading among various resistive coils was used for improved field homogeneity. The 48 mm magnet bore and 42 mm outer diameter of the probes leaves limited space for conventional shims and consequently a combination of resistive and ferromagnetic shims are used. Field maps corrected for field instabilities were obtained and shimming achieved better than 1 ppm homogeneity over a cylindrical volume of 1 cm diameter and height. The magnetic field is regulated within 0.2 ppm using an external 7Li lock sample doped with paramagnetic MnCl2. The improved field homogeneity and field regulation using a modified AVANCE NEO console enables NMR spectroscopy at 1H frequencies of 1.0, 1.2 and 1.5 GHz. NMR at 1.5 GHz reflects a 50{\%} increase in field strength above the highest superconducting magnets currently available. Three NMR probes have been constructed each equipped with an external lock rf coil for field regulation. Initial NMR results obtained from the SCH magnet using these probes illustrate the very exciting potential of ultra-high magnetic fields.",
    author = "Zhehong Gan and Ivan Hung and Xiaoling Wang and Joana Paulino and Gang Wu and Litvak, {Ilya M.} and Gor'kov, {Peter L.} and Brey, {William W.} and Pietro Lendi and Schiano, {Jeffrey Louis} and Bird, {Mark D.} and Dixon, {Iain R.} and Jack Toth and Boebinger, {Gregory S.} and Cross, {Timothy A.}",
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    Gan, Z, Hung, I, Wang, X, Paulino, J, Wu, G, Litvak, IM, Gor'kov, PL, Brey, WW, Lendi, P, Schiano, JL, Bird, MD, Dixon, IR, Toth, J, Boebinger, GS & Cross, TA 2017, 'NMR spectroscopy up to 35.2 T using a series-connected hybrid magnet', Journal of Magnetic Resonance, vol. 284, pp. 125-136. https://doi.org/10.1016/j.jmr.2017.08.007

    NMR spectroscopy up to 35.2 T using a series-connected hybrid magnet. / Gan, Zhehong; Hung, Ivan; Wang, Xiaoling; Paulino, Joana; Wu, Gang; Litvak, Ilya M.; Gor'kov, Peter L.; Brey, William W.; Lendi, Pietro; Schiano, Jeffrey Louis; Bird, Mark D.; Dixon, Iain R.; Toth, Jack; Boebinger, Gregory S.; Cross, Timothy A.

    In: Journal of Magnetic Resonance, Vol. 284, 01.11.2017, p. 125-136.

    Research output: Contribution to journalArticle

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    T1 - NMR spectroscopy up to 35.2 T using a series-connected hybrid magnet

    AU - Gan, Zhehong

    AU - Hung, Ivan

    AU - Wang, Xiaoling

    AU - Paulino, Joana

    AU - Wu, Gang

    AU - Litvak, Ilya M.

    AU - Gor'kov, Peter L.

    AU - Brey, William W.

    AU - Lendi, Pietro

    AU - Schiano, Jeffrey Louis

    AU - Bird, Mark D.

    AU - Dixon, Iain R.

    AU - Toth, Jack

    AU - Boebinger, Gregory S.

    AU - Cross, Timothy A.

    PY - 2017/11/1

    Y1 - 2017/11/1

    N2 - The National High Magnetic Field Laboratory has brought to field a Series-Connected Hybrid magnet for NMR spectroscopy. As a DC powered magnet it can be operated at fields up to 36.1 T. The series connection between a superconducting outsert and a resistive insert dramatically minimizes the high frequency fluctuations of the magnetic field typically observed in purely resistive magnets. Current-density-grading among various resistive coils was used for improved field homogeneity. The 48 mm magnet bore and 42 mm outer diameter of the probes leaves limited space for conventional shims and consequently a combination of resistive and ferromagnetic shims are used. Field maps corrected for field instabilities were obtained and shimming achieved better than 1 ppm homogeneity over a cylindrical volume of 1 cm diameter and height. The magnetic field is regulated within 0.2 ppm using an external 7Li lock sample doped with paramagnetic MnCl2. The improved field homogeneity and field regulation using a modified AVANCE NEO console enables NMR spectroscopy at 1H frequencies of 1.0, 1.2 and 1.5 GHz. NMR at 1.5 GHz reflects a 50% increase in field strength above the highest superconducting magnets currently available. Three NMR probes have been constructed each equipped with an external lock rf coil for field regulation. Initial NMR results obtained from the SCH magnet using these probes illustrate the very exciting potential of ultra-high magnetic fields.

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