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Progress from ASDEX Upgrade experiments in preparing the physics basis of ITER operation and DEMO scenario development

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اقرأ أكثر حفظ في قائمتي
  • المؤلفون: White, Anne
  • المصدر:
    IOP Publishing
  • نوع التسجيلة:
    article in journal/newspaper
  • اللغة:
    English
  • معلومة اضافية
    • Contributors:
      Massachusetts Institute of Technology. Department of Nuclear Science and Engineering
    • بيانات النشر:
      IOP Publishing
    • الموضوع:
      2023
    • Collection:
      DSpace@MIT (Massachusetts Institute of Technology)
    • نبذة مختصرة :
      Abstract An overview of recent results obtained at the tokamak ASDEX Upgrade (AUG) is given. A work flow for predictive profile modelling of AUG discharges was established which is able to reproduce experimental H-mode plasma profiles based on engineering parameters only. In the plasma center, theoretical predictions on plasma current redistribution by a dynamo effect were confirmed experimentally. For core transport, the stabilizing effect of fast ion distributions on turbulent transport is shown to be important to explain the core isotope effect and improves the description of hollow low-Z impurity profiles. The L–H power threshold of hydrogen plasmas is not affected by small helium admixtures and it increases continuously from the deuterium to the hydrogen level when the hydrogen concentration is raised from 0 to 100%. One focus of recent campaigns was the search for a fusion relevant integrated plasma scenario without large edge localised modes (ELMs). Results from six different ELM-free confinement regimes are compared with respect to reactor relevance: ELM suppression by magnetic perturbation coils could be attributed to toroidally asymmetric turbulent fluctuations in the vicinity of the separatrix. Stable improved confinement mode plasma phases with a detached inner divertor were obtained using a feedback control of the plasma β. The enhanced D α H-mode regime was extended to higher heating power by feedback controlled radiative cooling with argon. The quasi-coherent exhaust regime was developed into an integrated scenario at high heating power and energy confinement, with a detached divertor and without large ELMs. Small ELMs close to the separatrix lead to peeling-ballooning stability and quasi continuous power exhaust. Helium beam density fluctuation measurements confirm that transport close to the ...
    • File Description:
      application/pdf
    • Relation:
      Nuclear Fusion; https://hdl.handle.net/1721.1/147633; White, Anne. 2022. "Progress from ASDEX Upgrade experiments in preparing the physics basis of ITER operation and DEMO scenario development." Nuclear Fusion, 62 (4).
    • الدخول الالكتروني :
      https://hdl.handle.net/1721.1/147633
    • Rights:
      Creative Commons Attribution 4.0 International license ; https://creativecommons.org/licenses/by/4.0/
    • الرقم المعرف:
      edsbas.AC147D3D