On the role of the edge density profile for the L-H transition power threshold in ASDEX Upgrade

被引：31
|
作者：
Shao, L. M. [1 ,2 ]
Wolfrum, E. [1 ]
Ryter, F. [1 ]
Birkenmeier, G. [1 ,3 ]
Laggner, F. M. [4 ]
Viezzer, E. [1 ]
Fischer, R. [1 ]
Willensdorfer, M. [1 ]
Kurzan, B. [1 ]
Lunt, T. [1 ]
机构：
[1] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany
[2] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China
[3] Tech Univ Munich, Phys Dept E28, D-85748 Garching, Germany
[4] TU Wien, Inst Appl Phys, Fus OAW, Wiedner Hauptstr 8-10, A-1040 Vienna, Austria
来源：
PLASMA PHYSICS AND CONTROLLED FUSION | 2016年 / 58卷 / 02期
关键词：
L-H transition; power threshold; edge density profile; MODE TRANSITION; CONFINEMENT; PHYSICS; EQUILIBRIA; TURBULENCE; TRANSPORT; REGIME;
D O I：
10.1088/0741-3335/58/2/025004
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 L-H transition power threshold (PL-H) in full tungsten (W) wall discharges is lower by 25% compared to those with graphite (C) mix tungsten walls in ASDEX Upgrade (Ryter et al 2013 Nucl. Fusion 53 113003). The lower power threshold in the full tungsten wall discharges has been found to correlate with higher edge density as well as steeper edge density gradient. An estimate of the minimum in the neoclassical radial electric field well inside the separatrix yields a constant value for all analyzed L-H transitions at fixed toroidal magnetic field (BT). The decrease of the threshold power is explained by the steeper edge density gradient in the discharges with full tungsten wall.
引用
收藏
页数：11
相关论文
共 50 条
  • [31] Study of L-H transition triggered by pellet injection based on a power threshold model
    P. Klaywittaphat
    R. Picha
    T. Onjun
    Plasma Physics Reports, 2014, 40 : 790 - 796
  • [32] Analysis of the Variability of the L-H Transition Power Threshold in a Helium-4 Discharge
    吴国将
    张晓东
    Plasma Science and Technology, 2014, 16 (06) : 557 - 561
  • [33] H-mode confinement properties close to the power threshold in ASDEX Upgrade
    Ryter, F.
    Fuchs, J. C.
    Schneider, W.
    Sips, A. C. C.
    Staebler, A.
    Stober, J.
    11TH IAEA TECHNICAL MEETING ON H-MODE PHYSICS AND TRANSPORT BARRIERS, 2008, 123
  • [34] Poloidal asymmetries in the edge density profiles on ASDEX Upgrade
    Guimarais, L.
    Potzel, S.
    Silva, C.
    Bernert, M.
    Carralero, D.
    Conway, G. D.
    Gil, L.
    Manso, M. E.
    Nikolaeva, V.
    Reimold, F.
    Santos, J.
    Silva, A.
    Stroth, U.
    Vicente, J.
    Wischmeier, M.
    Wolfrum, E.
    NUCLEAR FUSION, 2018, 58 (02)
  • [35] L-H transition threshold studies in helium plasmas at JET
    Solano, E. R.
    Birkenmeier, G.
    Delabie, E.
    Silva, C.
    Hillesheim, J. C.
    Boboc, A.
    Carvalho, I. S.
    Carvalho, P.
    Chernyshova, M.
    Craciunescu, T.
    de la Luna, E.
    Fontdecaba, J. M.
    Henriques, R.
    Jacquet, P.
    Jepu, I
    Kappatou, A.
    King, D.
    Lennholm, M.
    Lerche, E.
    Litherland-Smith, E.
    Loarte, A.
    Maslov, M.
    Diaz, F. Parra
    Parail, V
    Pawelec, E.
    Rimini, F. G.
    Shaw, A.
    Siren, P.
    Szepesi, G.
    Stancar, Z.
    Tholerus, E.
    Vartanian, S.
    Viola, B.
    Weisen, H.
    NUCLEAR FUSION, 2021, 61 (12)
  • [36] Edge turbulence velocity preceding the L-H transition in NSTX
    Zweben, S. J.
    Diallo, A.
    Lampert, M.
    Stoltzfus-Dueck, T.
    Banerjee, S.
    PHYSICS OF PLASMAS, 2021, 28 (03)
  • [37] Dependence of the density shape on the heat flux profile in ASDEX Upgrade high density H modes
    Stober, J
    Fuchs, C
    Gruber, O
    Kaufmann, M
    Kurzan, B
    Meo, F
    Müller, HW
    Ryter, F
    NUCLEAR FUSION, 2001, 41 (11) : 1535 - 1538
  • [38] L-H TRANSITION AND EDGE TRANSPORT BARRIER FORMATION ON LHD
    Toi, K.
    Watanabe, F.
    Ohdachi, S.
    Morita, S.
    Gao, X.
    Narihara, K.
    Sakakibara, S.
    Tanaka, K.
    Tokuzawa, T.
    Urano, H.
    Weller, A.
    Yamada, I.
    Yan, L.
    FUSION SCIENCE AND TECHNOLOGY, 2010, 58 (01) : 61 - 69
  • [39] The role of the current profile in the improved H-mode scenario in ASDEX Upgrade
    Stober, J.
    Sips, A. C. C.
    Angioni, C.
    Forest, C. B.
    Gruber, O.
    Hobirk, J.
    Horton, L. D.
    Maggi, C. F.
    Maraschek, M.
    Martin, P.
    Mc Carthy, P. J.
    Mertens, V.
    Na, Y.-S.
    Reich, M.
    Staebler, A.
    Tardini, G.
    Zohm, H.
    NUCLEAR FUSION, 2007, 47 (08) : 728 - 737
  • [40] Density dependence of SOL power width in ASDEX upgrade L-Mode
    Sieglin, B.
    Eich, T.
    Faitsch, M.
    Herrmann, A.
    Nille, D.
    Scarabosio, A.
    NUCLEAR MATERIALS AND ENERGY, 2017, 12 : 216 - 220
12345