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NMR Spectrometers: Resolution and Error Correction01:14

NMR Spectrometers: Resolution and Error Correction

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When magnetic nuclei in a sample achieve resonance and undergo relaxation, the signal detected in NMR is an approximately exponential free induction decay. Fourier transform of an exponential decay yields a Lorentzian peak in the frequency domain. Lorentzian peaks in an NMR spectrum are defined by their amplitude, full width at half maximum, and position, where the peak width is governed by the spin-spin relaxation time alone. In real experiments, however, the applied magnetic field is rendered...
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The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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NMR spectrometers consist of a strong magnet, a radiofrequency transmitter, and a detector attached to a computer console for recording spectra of samples containing NMR-active nuclei. In first-generation NMR instruments called continuous-wave spectrometers, the resonance frequencies of the nuclei are determined by frequency-sweep or field-sweep methods. The magnetic field strength is fixed and the rf signal is swept in the former, while the radiofrequency signal is fixed and the magnetic field...
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Magnetic resonance imaging (MRI) is a noninvasive medical imaging technique based on a phenomenon of nuclear physics discovered in the 1930s, in which matter exposed to magnetic fields and radio waves was found to emit radio signals. In 1970, a physician and researcher named Raymond Damadian noticed that malignant (cancerous) tissue gave off different signals than normal body tissue. He applied for a patent for the first MRI scanning device in clinical use by the early 1980s. The early MRI...
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A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
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Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
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A High-Resolution 1.3-GHz/54-mm LTS/HTS NMR Magnet.

Yukikazu Iwasa1, Juan Bascuñán1, Seungyong Hahn1

  • 1Francis Bitter Magnet Laboratory (FBML) of the Plasma Science and Fusion Center (PSFC), Massachusetts Institute of Technology (MIT), Cambridge, MA 02139 USA.

IEEE Transactions on Applied Superconductivity : a Publication of the IEEE Superconductivity Committee
|September 21, 2020
PubMed
Summary

This study details a 1.3-GHz/54-mm high-temperature superconducting (HTS) nuclear magnetic resonance magnet. Key innovations include no-insulation winding techniques and persistent-mode HTS shims for advanced magnetic field generation.

Keywords:
High-temperature superconducting (HTS) shim coilsinside-notch double-pancake (DP) coillow-temperature superconducting (LTS)/HTS nuclear magnetic resonance (NMR) magnetscreening-current-induced field (SCF) shaking magnet

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Area of Science:

  • * Physics and Engineering
  • * Materials Science

Background:

  • * Development of high-field magnets is crucial for advanced Nuclear Magnetic Resonance (NMR) spectroscopy.
  • * High-temperature superconductors (HTS) offer potential for higher magnetic fields and operating temperatures compared to traditional low-temperature superconductors.
  • * The Massachusetts Institute of Technology Francis Bitter Magnet Laboratory is developing a 1.3-GHz/54-mm HTS NMR magnet.

Purpose of the Study:

  • * To present the design and innovative features of a 1.3-GHz/54-mm HTS NMR magnet.
  • * To detail the application and impact of no-insulation (NI) winding techniques in the magnet's coils.
  • * To report preliminary operational results of a key magnet component.

Main Methods:

  • * Construction of a three-coil (Coils 1-3) 800-MHz HTS insert using 96 double-pancake coils.
  • * Winding of coils with 6-mm-wide GdBCO tape employing a no-insulation (NI) technique.
  • * Integration of persistent-mode HTS shims and a "shaking" magnet feature.
  • * Testing and preliminary data acquisition from Coil 1 at 4.2 K.

Main Results:

  • * Successful implementation of NI winding technique in Coils 1-3, although resulting in a charging time delay.
  • * Design and incorporation of persistent-mode HTS shims for enhanced field stability.
  • * Preliminary operational data from Coil 1 at 4.2 K indicates successful performance.
  • * Introduction of a novel "shaking" magnet design feature.

Conclusions:

  • * The 1.3-GHz/54-mm HTS NMR magnet incorporates several innovative design features.
  • * The NI winding technique, while effective, presents challenges in charging time that require further investigation.
  • * Persistent-mode HTS shims and the "shaking" magnet are promising advancements for high-field NMR magnets.
  • * Preliminary results demonstrate the feasibility and potential of the developed HTS magnet system.