Pedestal instabilities during the L-H transition in ASDEX-Upgrade plasmas

被引：0
|
作者：
Clairet, F. [1 ]
Glasser, A. [2 ]
Conway, G. D. [3 ]
Bottereau, C. [1 ]
机构：
[1] IRFM, CEA, F-13108 Durance, France
[2] Aix Marseille Univ, CNRS, Cent Marseille, M2P2, Marseille, France
[3] Max Planck Inst Plasma Phys, D-85748 Garching, Germany
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2025年 / 67卷 / 03期
关键词：
L-H transition; pedestal; turbulence; reflectometry; tokamak; MICROWAVE REFLECTOMETRY; FLOW;
D O I：
10.1088/1361-6587/adb887
中图分类号：
O35 [流体力学]; O53 [等离子体物理学];
学科分类号：
070204 ; 080103 ; 080704 ;
摘要：
The high confinement regime, or H-mode, is the result of a transport barrier at the plasma edge, where the pressure rises sharply to form a pedestal. This paper reports on a collection of experimental observations of instabilities and turbulence occurring in this decisive and narrow edge region. Using the high sampling rate enabled by an ultra-fast frequency sweeping reflectometer, a high spatial and temporal resolution analysis of density, gradients, and turbulence allows new and thorough insights on plasma instabilities arising from the microturbulence and flow competing system during the I-phase to the edge localized modes and blob-filaments during the established H-mode. The measurements provide the observation on how different instabilities can arise in the pedestal during the L-H transition and address their specific turbulent natures.
引用
收藏
页数：10
相关论文
共 50 条
  • [1] L-H transition in the presence of magnetic perturbations in ASDEX Upgrade
    Ryter, F.
    Rathgeber, S. K.
    Viezzer, E.
    Suttrop, W.
    Burckhart, A.
    Fischer, R.
    Kurzan, B.
    Potzel, S.
    Puetterich, T.
    NUCLEAR FUSION, 2012, 52 (11)
  • [2] The role of the density profile in the ASDEX-Upgrade pedestal structure
    Dunne, M. G.
    Potzel, S.
    Reimold, F.
    Wischmeier, M.
    Wolfrum, E.
    Frassinetti, L.
    Beurskens, M.
    Bilkova, P.
    Cavedon, M.
    Fischer, R.
    Kurzan, B.
    Laggner, F. M.
    McDermott, R. M.
    Tardini, G.
    Trier, E.
    Viezzer, E.
    Willensdorfer, M.
    PLASMA PHYSICS AND CONTROLLED FUSION, 2017, 59 (01)
  • [3] Recent progress in understanding the L-H transition physics from ASDEX Upgrade
    Wolfrum, E.
    Sauter, P.
    Willensdorfer, M.
    Ryter, F.
    Aumayr, F.
    Barrera-Orte, L.
    Burckhart, A.
    Fable, E.
    Fischer, R.
    Kurzan, B.
    Puetterich, T.
    Rathgeber, S. K.
    Suttrop, W.
    Viezzer, E.
    PLASMA PHYSICS AND CONTROLLED FUSION, 2012, 54 (12)
  • [4] On the role of the edge density profile for the L-H transition power threshold in ASDEX Upgrade
    Shao, L. M.
    Wolfrum, E.
    Ryter, F.
    Birkenmeier, G.
    Laggner, F. M.
    Viezzer, E.
    Fischer, R.
    Willensdorfer, M.
    Kurzan, B.
    Lunt, T.
    PLASMA PHYSICS AND CONTROLLED FUSION, 2016, 58 (02)
  • [5] L-H transition and pedestal studies on MAST
    Meyer, H.
    De Bock, M. F. M.
    Conway, N. J.
    Freethy, S. J.
    Gibson, K.
    Hiratsuka, J.
    Kirk, A.
    Michael, C. A.
    Morgan, T.
    Scannell, R.
    Naylor, G.
    Saarelma, S.
    Saveliev, A. N.
    Shevchenko, V. F.
    Suttrop, W.
    Temple, D.
    Vann, R. G. L.
    NUCLEAR FUSION, 2011, 51 (11)
  • [6] Electron density evolution after L-H transitions and the L-H/H-L cycle in ASDEX Upgrade
    Willensdorfer, M.
    Wolfrum, E.
    Scarabosio, A.
    Aumayr, F.
    Fischer, R.
    Kurzan, B.
    McDermott, R. M.
    Mlynek, A.
    Nold, B.
    Rathgeber, S. K.
    Rohde, V.
    Ryter, F.
    Sauter, P.
    Viezzer, E.
    NUCLEAR FUSION, 2012, 52 (11)
  • [7] Edge turbulent transport toward the L-H transition in ASDEX Upgrade and JET-ILW
    Bonanomi, N.
    Angioni, C.
    Plank, U.
    Schneider, P. A.
    Maggi, C. F.
    PHYSICS OF PLASMAS, 2021, 28 (05)
  • [8] From L-mode to the L-H transition, experiments on ASDEX upgrade and related gyrokinetic simulations
    Bonanomi, N.
    Angioni, C.
    Conway, G. D.
    Happel, T.
    Plank, U.
    Schneider, P. A.
    Staebler, G. M.
    PHYSICS OF PLASMAS, 2024, 31 (07)
  • [9] Particle transport analysis of the density build-up after the L-H transition in ASDEX Upgrade
    Willensdorfer, M.
    Fable, E.
    Wolfrum, E.
    Aho-Mantila, L.
    Aumayr, F.
    Fischer, R.
    Reimold, F.
    Ryter, F.
    NUCLEAR FUSION, 2013, 53 (09)
  • [10] Influence of pedestal radiation on the H-L transition using krypton seeded discharges at ASDEX Upgrade
    David, P.
    Bernert, M.
    Cavedon, M.
    Harrer, G.
    Eich, T.
    NUCLEAR FUSION, 2022, 62 (10)
12345