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@ARTICLE{Parnell:2019,
      author       = {Parnell, S.R. and Babcock, E. and Nüninghof, K. and Skoda,
                      M. W. A. and Boag, S. and Masalovich, S. and Chen, W.C. and
                      Georgii, R. and Wild, J.M. and Frost, C.D.},
      title        = {{S}tudy of spin-exchange optically pumped 3{H}e cells with
                      high polarisation and long lifetimes},
      journal      = {Nuclear instruments $\&$ methods in physics research / A},
      volume       = {598},
      issn         = {0168-9002},
      address      = {Amsterdam},
      publisher    = {North-Holland Publ. Co.},
      reportid     = {PreJuSER-2019},
      pages        = {774 - 778},
      year         = {2009},
      note         = {The authors would like to thank Dr. T. Gentile for loan of
                      the cell Lion and feedback on this work. Dr. A. loffe for
                      useful discussions and O. Lykhvar for technical support
                      during our experiments at FRM-2. This research project has
                      been supported by EPSRC [EP/D070252/1], STFC [CC/DO00130/1]
                      and the European Commission under the 6<SUP>th</SUP>
                      Framework Programme through the Key Action: Strengthening
                      the European Research Area, Research Infrastructures.
                      Contract no: RII3-CT-2003-505925.},
      abstract     = {We present a detailed investigation in to He-3 neutron spin
                      filter cells polarised by spin exchange optical pumping
                      (SEOP). We include measurements of the absolute He-3
                      polarisation using neutron transmission and characterisation
                      of both the X-factor and He-3 relaxation times (T-1) for a
                      number of cells. For one cell we calculated a Maximum He-3
                      polarisation of $79\%$ with a T, of 633 h. The measured
                      X-factor of this cell, X = 0.17 +/- 0.01, is low. For all
                      cells polarisations of > $71\%$ are observed. In addition we
                      present He-3 relaxation data for a new design of
                      magneto-static cavity with a field of high homogeneity Delta
                      B/B-0 approximate to 3.5 x 10(-4) cm(-1). This compact
                      device provides a magnetic field in an orientation suitable
                      for in situ optical pumping that minimises the field
                      inhomogeneity contribution to the T, to 930h in a 1 bar
                      cell, the longest reported on beam thus far. The results
                      suggest that high He-3 polarisation with long relaxation
                      times can now be routinely obtained with SEOP, enabling time
                      independent incident beam polarisation to be easily
                      implemented across many different neutron Scattering
                      instruments. (c) 2008 Elsevier B.V. All rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {IEK-6},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IEK-6-20101013},
      pnm          = {Nukleare Sicherheitsforschung},
      pid          = {G:(DE-Juel1)FUEK404},
      experiment   = {EXP:(DE-MLZ)MIRA-20140101 / EXP:(DE-MLZ)NO-20140101},
      shelfmark    = {Instruments $\&$ Instrumentation / Nuclear Science $\&$
                      Technology / Physics, Particles $\&$ Fields / Spectroscopy},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000262825500015},
      doi          = {10.1016/j.nima.2008.10.009},
      url          = {https://juser.fz-juelich.de/record/2019},
}