Results 11 to 20 of about 120,584 (295)
IMPURITY TRANSPORT IN TOKAMAKS* [PDF]
, 1977 A review is given of the principle results of the neoclassical theory of impurity transport in tokamaks, emphasizing those collisionality regimes of most practical interest. Some new results are given for the case where there are several different impurity species present at the same time, with both hydrogenic and impurity ions in the Pfirsch ...
Rutherford, P. H. +4 more
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TRANSPORT IN LUTTINGER LIQUIDS WITH STRONG IMPURITIES [PDF]
International Journal of Modern Physics B, 2007 The tunnel current of a Luttinger liquid with a finite density of strong impurities is calculated using an instanton approach. For very low temperatures T or electric fields E the (nonlinear) conductivity is of variable range hopping (VRH) type as for weak pinning.
Malinin, S., Nattermann, T.
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A comprehensive study on impurity behavior in LHD long pulse discharges
Nuclear Materials and Energy, 2017 Impurity behavior is studied in a variety of LHD (Large Helical Device) long pulse discharges, i.e. standard hydrogen plasmas, super dense core plasmas, helium plasmas with ICH (Ion Cyclotron Frequency Heating), multi-species plasmas mixed with H and He.
Y. Nakamura +14 more
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Nuclear Materials and Energy, 2020 The transport as well as accumulation of tungsten (W) impurity is one of the critical issues for the W divertor operation. The EAST tokamak with W and graphite divertor targets, provides a good platform for the investigation of W impurity behaviors.
Qingrui Zhou +6 more
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Charge dependence of neoclassical and turbulent transport of light impurities on MAST [PDF]
, 2015 Carbon and nitrogen impurity transport coefficients are determined from gas puff experiments carried out during repeat L-mode discharges on the Mega-Amp Spherical Tokamak (MAST) and compared against a previous analysis of helium impurity transport on ...
Casson, F. J. +10 more
core +2 more sources
13C surface characterization of midplane and crown collector probes on DIII-D
Nuclear Materials and Energy, 2023 A dual collector probe system has been implemented on DIII-D for scrape-off-layer (SOL) impurity transport studies. These experiments injected isotopically enriched methane (13CD4) and sampled the impurities from this extrinsic, primary source with ...
J.D. Duran +13 more
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Turbulent transport of impurities and their effect on energy confinement [PDF]
, 2012 By presenting linear and nonlinear gyrokinetic studies, based on a balanced neutral beam injection deuterium discharge from the DIII-D tokamak, we demonstrate that impurities alter the scaling of the transport on the charge and mass of the main species ...
Candy, J. +3 more
core +2 more sources
Dissipation engineered directional filter for quantum ratchets
Physical Review Research, 2021 We demonstrate transport rectification in a Hermitian Hamiltonian quantum ratchet by a dissipative, dynamic impurity. While the bulk of the ratchet supports transport in both directions, the properly designed loss function of the local impurity acts as a
Zlata Fedorova +5 more
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3D global impurity transport modeling with WallDYN and EMC3-Eirene
Nuclear Materials and Energy, 2018 The global impurity migration code WallDYN was coupled to the 3D scrape off layer plasma solver EMC3-Eirene in order to make WallDYN applicable to 3D, non-toroidally symmetric, geometries.
K. Schmid, T. Lunt
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Josephson Transport through a Hubbard Impurity Center [PDF]
Physical Review Letters, 2003 We investigate the Josephson transport through a thin semiconductor barrier containing impurity centers with the on-site Hubbard interaction $u$ of an arbitrary sign and strength. We find that in the case of the repulsive interaction the Josephson current changes sign with the temperature increase if the energy of the impurity level $ε$ (measured from ...
Kozub, V. I. +2 more
openaire +3 more sources