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@ARTICLE{Windt:11078,
      author       = {Windt, C. W. and Soltner, H. and van Dusschoten, D. and
                      Blümler, P.},
      title        = {{A} portable {H}albach magnet that can be opened and closed
                      without force: {T}he {NMR}-{CUFF}},
      journal      = {Journal of magnetic resonance},
      volume       = {208},
      issn         = {1090-7807},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier},
      reportid     = {PreJuSER-11078},
      year         = {2011},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Portable equipment for nuclear magnetic resonance (NMR) is
                      becoming increasingly attractive for use in a variety of
                      applications. One of the main scientific challenges in
                      making NMR portable is the design of light-weight magnets
                      that possess a strong and homogeneous field. Existing NMR
                      magnets can provide such magnetic fields, but only for small
                      samples or in small regions, or are rather heavy. Here we
                      show a simple yet elegant concept for a Halbach-type
                      permanent magnet ring, which can be opened and closed with
                      minimal mechanical force. An analytical solution for an
                      ideal Halbach magnet shows that the magnetic forces cancel
                      if the structure is opened at an angle of 35.3° relative to
                      its poles. A first prototype weighed only 3.1 kg, and
                      provided a flux density of 0.57 T with a homogeneity better
                      than 200 ppm over a spherical volume of 5mm in diameter
                      without shimming. The force needed to close it was found to
                      be about 20 N. As a demonstration, intact plants were imaged
                      and water (xylem) flow measured. Magnets of this type
                      (NMR-CUFF = Cut-open, Uniform, Force Free) are ideal for
                      portable use and are eminently suited to investigate small
                      or slender objects that are part of a larger or immobile
                      whole, such as branches on a tree, growing fruit on a plant,
                      or non-metallic tubing in industrial installations. This new
                      concept in permanent-magnet design enables the construction
                      of openable, yet strong and homogeneous magnets, which aside
                      from use in NMR or MRI could also be of interest for
                      applications in accelerators, motors, or magnetic bearings.},
      keywords     = {Equipment Design / Equipment Failure Analysis / Magnetic
                      Resonance Spectroscopy: instrumentation / Magnetics:
                      instrumentation / Miniaturization / Stress, Mechanical / J
                      (WoSType)},
      cin          = {IBG-2},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IBG-2-20101118},
      pnm          = {Terrestrische Umwelt},
      pid          = {G:(DE-Juel1)FUEK407},
      shelfmark    = {Biochemical Research Methods / Physics, Atomic, Molecular
                      $\&$ Chemical / Spectroscopy},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:21036637},
      UT           = {WOS:000286774300004},
      doi          = {10.1016/j.jmr.2010.09.020},
      url          = {https://juser.fz-juelich.de/record/11078},
}