Results 21 to 30 of about 2,872,515 (340)

OEDGE modeling of far-SOL tungsten impurity sources and screening in WEST

Nuclear Materials and Energy, 2022
The plasma background and impurity transport in the scrape-off layer (SOL) of the WEST tokamak are modeled for three discharges over a Psep power scan ranging between 1.5 and 2.35 MW. An extended modeling grid is used to investigate far-SOL sourcing from
J.B. Maeker, J.H. Nichols, D.C. Donovan, A. Grosjean, J. Gunn, N. Fedorczak, C. Guillemaut, C.C. Klepper, E.A. Unterberg, D.C. Easley, WEST Team   +10 more
doaj   +1 more source

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., Dickinson, D., Garzotti, L., Henderson, S. S., O'Mullane, M., Patel, A., Roach, C. M., Summers, H. P., Tanabe, H., team, the MAST, Valovic, M.   +10 more
core   +2 more sources

Impurity transport and divertor retention in Ar and N seeded SOLPS 5.0 simulations for ASDEX Upgrade

Plasma Physics and Controlled Fusion, 2020
Impurity seeding will be an important tool to reduce the peak power loads and temperatures at the divertor targets in future tokamak devices. To improve the physics understanding and provide predictive capabilities for the impact of impurities on the ...
F. Hitzler, M. Wischmeier, F. Reimold, D. Coster   +3 more
semanticscholar   +1 more source

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., Hirshman, S. P., Jensen, R., Post, D. E., Seidl, F. G. P.   +4 more
openaire   +1 more source

Anomalous impurity transport in plasmas [PDF]

Nuclear Fusion, 1983
The transport of hith Z impurities resulting from Compton and induced scattering by drift waves is found to be comparable in magnitude with base ion and electron transport when the fluctuation spectrum is obtained from a recent theory of drift turbulence. The anomalous frictional flux is marginally subdominant whilst the diffusion flux is enhanced over
Rogister, A., Hasselberg, G.
openaire   +3 more sources

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, N. Tamura, M. Kobayashi, S. Yoshimura, C. Suzuki, M. Yoshinuma, M. Goto, G. Motojima, K. Nagaoka, K. Tanaka, R. Sakamoto, B.J. Peterson, K. Ida, M. Osakabe, T. Morisaki   +14 more
doaj   +1 more source

The transport of tungsten impurities induced by the intrinsic carbon during upper-single null discharge on EAST tokamak

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, Chaofeng Sang, Guoliang Xu, Rui Ding, Xuele Zhao, Yilin Wang, Dezhen Wang   +6 more
doaj   +1 more source

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., Fulop, T., Mollen, A., Pusztai, I.   +3 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, D.C. Donovan, J.H. Nichols, E.A. Unterberg, S.A. Zamperini, T. Abrams, R. Perillo, J. Ren, D.L. Rudakov, M.W. Shafer, P.C. Stangeby, D.A. Taussig, R.S. Wilcox, M.P. Zach   +13 more
doaj   +1 more source

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, Christoph Dauer, Anna Sidorenko, Sebastian Eggert, Johann Kroha, Stefan Linden   +5 more
doaj   +1 more source