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首页> 外文期刊>Nuclear fusion >Confinement of 'improved H-modes' in the all-tungsten ASDEX Upgrade with nitrogen seeding
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Confinement of 'improved H-modes' in the all-tungsten ASDEX Upgrade with nitrogen seeding

机译：在全钨ASDEX升级中，“氮模式”限制了“改进的H模式”

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摘要

In ASDEX Upgrade the compatibility of improved H-modes with an all-W wall has been demonstrated. Under boronized conditions light impurities and the radiated power fraction in the divertor were reduced, requiring N seeding to cool the divertor plasma. The impurity seeding does not only protect the divertor tiles but also considerably improves the performance of improved H-mode discharges by up to 25%. The energy confinement increases to H_(98) -factors up to 1.3 and thereby exceeds the best values in the carbon-dominated AUG at the same density and collisionality. This improvement is due to higher edge temperatures rather than to peaking of the electron density profile. Higher temperatures are reached at the pedestal top leading, via profile stiffness, to an increase in the total plasma pressure. There is no change to R/L_(T_(e,i)) in the plasma core. The dilution at the plasma edge by nitrogen seems to play an important role since it allows higher ion temperatures at the same edge ion pressure as in the unseeded case. The dilution of the core plasma remains moderate.
机译：在ASDEX升级中，已经证明了改进的H模式与全W墙的兼容性。在硼化条件下，减少了偏滤器中的轻杂质和辐射功率分数，需要注入N晶种以冷却偏滤器等离子体。杂质注入不仅可以保护偏滤片，而且还可以将改进的H型放电性能提高25％。能量限制增加到H_（98）-高达1.3，从而在相同的密度和碰撞性下超过了以碳为主的AUG中的最佳值。这种改善是由于较高的边缘温度，而不是由于电子密度分布达到峰值。在基座顶部达到更高的温度，通过轮廓刚度导致总等离子体压力的增加。等离子体核心中的R / L_（T_（e，i））没有变化。氮气在等离子体边缘处的稀释似乎起着重要的作用，因为它可以在与未接种的情况下相同的边缘离子压力下提高离子温度。核心血浆的稀释度仍然适中。

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  • 来源
    《Nuclear fusion》 |2011年第11期|p.113003.1-113003.7|共7页
  • 作者

    J. Schweinzer; A.C.C. Sips; G. Tardini; P.A. Schneider; R. Fischer; J.C. Fuchs; O. Gruber; J. Hobirk; A. Kallenbach; R.M. McDermott; R. Neu; T. Puetterich; S.K. Rathgeber; J. Stober; J. Vicente;

  • 作者单位

    Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany, Euratom Association;

    EFDA-JET, Culham Science Centre, OX14 3DB, Abingdon, UK;

    Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany, Euratom Association;

    Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany, Euratom Association;

    Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany, Euratom Association;

    Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany, Euratom Association;

    Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany, Euratom Association;

    Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany, Euratom Association;

    Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany, Euratom Association;

    Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany, Euratom Association;

    Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany, Euratom Association;

    Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany, Euratom Association;

    Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany, Euratom Association;

    Max-Planck-Institut fuer Plasmaphysik, D-85748 Garching, Germany, Euratom Association;

    rnAssociacao EURATOM/IST, Instituto de Plasmas e Fosao Nuclear-Laboratorio Associado,IST, Lisbon, Portugal;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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