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@ARTICLE{Tokar:28008,
      author       = {Tokar, M. Z.},
      title        = {{M}echanism of central temperature peaking in impurity
                      seeded plasmas},
      journal      = {Plasma physics and controlled fusion},
      volume       = {45},
      issn         = {0741-3335},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {PreJuSER-28008},
      pages        = {1323 - 1332},
      year         = {2003},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Formation of a centrally peaked profile of the ion
                      temperature by impurity seeding has been observed in all the
                      largest tokamaks: JET, JT-60U, TFTR. A possible explanation
                      of this phenomenon is proposed, which takes into account the
                      suppression of ion temperature gradient instability induced
                      anomalous transport through increasing ion effective charge
                      Z(eff) and Doppler shift of unstable modes, S-perpendicular
                      to. The particular importance of the S-perpendicular to
                      component proportional to the temperature gradient, which
                      stems from the pressure gradient and neoclassical poloidal
                      rotation, is elucidated. It is demonstrated that this
                      contribution grows significantly by impurity seeding when
                      the rotation regime changes due to increased collisionality.
                      An interrelation between the heating power density and
                      Z(eff) necessary for the transition to a peaked ion
                      temperature is found. The modification of radial profiles by
                      impurity seeding is modelled numerically and the results are
                      in agreement with the experimental data from JET.},
      keywords     = {J (WoSType)},
      cin          = {IPP},
      ddc          = {530},
      cid          = {I:(DE-Juel1)VDB181},
      pnm          = {Kernfusion und Plasmaforschung},
      pid          = {G:(DE-Juel1)FUEK250},
      shelfmark    = {Physics, Fluids $\&$ Plasmas / Physics, Nuclear},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000184656800021},
      doi          = {10.1088/0741-3335/45/7/319},
      url          = {https://juser.fz-juelich.de/record/28008},
}