Výsledky vyhledávání

Particle confinement control with resonant magnetic perturbations at TEXTOR

Autor: G.W. Spakman, Todd Evans, V. Phillips, Oliver Schmitz, Michael Lehnen, J. W. Coenen, Detlev Reiter, U. Samm, K.H. Finken, H. Frerichs, G. Telesca, A. Kraemer-Flecken, M. W. Jakubowski, M. Kantor, M. Clever, B. Unterberg, S. Brezinsek

Publikováno v: STARTPAGE=330;ENDPAGE=334;TITLE=None

Two very contrary particle confinement stages were obtained at TEXTOR-DED by application of resonant magnetic perturbations. On the one hand a spontaneous build up of the total number of particles N tot with correlated increase in the particle confin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d7580ec236840e9d43bccd06627bff7c
https://doi.org/10.1016/j.jnucmat.2009.01.149

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Carbon transport in the stochastic magnetic boundary of TEXTOR

Autor: M. von Hellermann, K.H. Finken, G. Van Oost, G. Telesca, Michael Lehnen, U. Samm, A. Pospieszczyk, M. W. Jakubowski, M. Z. Tokar, Yunfeng Liang, B. Unterberg, E. Delabie, Oliver Schmitz, S. Brezinsek

Publikováno v: STARTPAGE=227;ENDPAGE=231;TITLE=None

For given conditions, significant change in main particle and carbon transport is observed in TEXTOR under the action of the Dynamic Ergodic Divertor, DED, operating both in 6/2 and 3/1 basic modes. In particular, the stochastic layer created at the

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8a899c2a1d7c3064753c65ef6a1f545c
https://doi.org/10.1016/j.jnucmat.2009.01.061

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Edge turbulence during the static dynamic ergodic divertor experiments in TEXTOR

Autor: R. J. E. Jaspers, Y. Xu, P. Beyer, Michael Lehnen, B. Unterberg, Dirk Reiser, K.H. Finken, S. Jachmich, R.R. Weynants, M. W. Jakubowski, M. Vergote, M. Mitri, M. Van Schoor, B. Schweer

Publikováno v: Nuclear Fusion. 47:1696-1709

The influence of the magnetic ergodization on edge turbulence and turbulence-induced transport has been investigated by Langmuir probes in TEXTOR under three different static DED configurations. Common features are observed. With DED, the edge equili

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::4a167b891a3d0b5749a9988a6ab9424a
https://doi.org/10.1088/0029-5515/47/12/008

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Observation of the heteroclinic tangles in the heat flux pattern of the ergodic divertor at TEXTOR

Autor: Andreas Wingen, R. C. Wolf, Karl H. Spatschek, Michael Lehnen, Sadrilla S. Abdullaev, K.H. Finken, M. W. Jakubowski

Publikováno v: Journal of Nuclear Materials. :371-376

A fine structure of open chaotic field lines, namely, a heteroclinic tangle, in the ergodic divertor has been observed by measurements of heat deposition pattern on the divertor plates at TEXTOR. Calculations show that magnetic footprints on the dive

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a99a7e65c25f5ea2f610a8c5a9ce6047
https://doi.org/10.1016/j.jnucmat.2007.01.158

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Characterization of transport in the stochastic edge layer of TEXTOR by analysis of the radial and poloidal distribution of electron density and temperature

Autor: Ph. Mertens, D. Harting, X. Loozen, S. Brezinsek, H. Frerichs, M. Z. Tokar, Sadrilla S. Abdullaev, B. Schweer, U. Samm, B. Unterberg, K.H. Finken, Gennady Sergienko, R. C. Wolf, Michael Lehnen, Detlev Reiter, Oliver Schmitz, M. W. Jakubowski

Publikováno v: Journal of Nuclear Materials. :680-685

At TEXTOR the dynamic ergodic divertor (DED) induces a stochastic edge layer by a resonant magnetic perturbation to control heat and particle exhaust. In this paper the characterization of its generic transport properties is described. The radial and

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::39cac21310a2fbf0af5f1a49706d4215
https://doi.org/10.1016/j.jnucmat.2007.01.067

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Vlasov description of space charge inversion close to the wall in a collisionless plasma sheath at grazing incidence of the magnetic field

Autor: H. Gerhauser, Magdi Shoucri, K.H. Finken

Publikováno v: Physica Scripta. 75:712-721

We study the problem of the formation of a collisionless plasma sheath at a plasma–wall transition with grazing incidence of the magnetic field. We show that for a large ratio of the ion gyroradius to the Debye length, and below a critical angle ,

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c3ccd1cc20cf4761685d7f9967837a11
https://doi.org/10.1088/0031-8949/75/5/020

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Runaway losses in ergodized plasmas

Autor: Andreas Wingen, K.H. Finken, R. J. E. Jaspers, R. C. Wolf, Sadrilla S. Abdullaev, R. Schlickeiser, Karl H. Spatschek, Michael Lehnen, M. W. Jakubowski

Publikováno v: Nuclear Fusion. 47:91-102

New results from the generation of runaways and the loss of runaway electrons in an ergodized magnetic field are presented. For the generation process, a clear difference between a ‘normal’ and a clean, freshly boronized wall condition has been f

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::5199b6a913d5ee20d3cb13aefe13b38a
https://doi.org/10.1088/0029-5515/47/2/004

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Mechanism of runaway electron beam formation during plasma disruptions in tokamaks

Autor: H. R. Koslowski, Oswald Willi, Sadrilla S. Abdullaev, M. Z. Tokar, K.H. Finken, Textor team, K. Wongrach, Long Zeng

Publikováno v: Physics of plasmas 22(4), 040704 (2015). doi:10.1063/1.4919253

A new physical mechanism of formation of runaway electron (RE) beams during plasma disruptions in tokamaks is proposed. The plasma disruption is caused by a strong stochastic magnetic field formed due to nonlinearly excited low-mode number magnetohyd

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::af8500ed6865bfb22fc19ad4a6106aa9

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Mappings of stochastic field lines in poloidal divertor tokamaks

Autor: Michael Lehnen, M. W. Jakubowski, K.H. Finken, Sadrilla S. Abdullaev

Publikováno v: Nuclear fusion 46, s113-s126 (2006). doi:10.1088/0029-5515/46/4/S02

Two mapping methods to study magnetic field lines near the separatrix of poloidal divertor tokamaks in the presence of external non-axisymmetric magnetic perturbations are proposed. The first mapping method is based on the Hamiltonian formulation of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6751cb4f7bb89aaed7ef92c011acaafa
https://doi.org/10.1088/0029-5515/46/4/s02

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The Dynamic Ergodic Divertor (DED)

Autor: K.H. Finken

Publikováno v: Fusion science and technology 49, 240-247 (2006).

The Dynamic Ergodic Divertor (DED) has recently been taken into operation on the TEXTOR tokamak. The main aim in this context is the study of its diverior properties. After an introduction into the theory of ergodization, the design of the DED is pre

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ab828cb9b35bfb33c6c3e461d32e8b5e
https://doi.org/10.13182/fst06-a1123

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