Dependence of scrape-off layer profiles and turbulence on gas fuelling in high density H-mode regimes in TCV

被引：19

作者：

Stagni, A. ^{[1
]}

Vianello, N. ^{[1
]}

Tsui, C. K. ^{[2
]}

Colandrea, C. ^{[3
]}

Gorno, S. ^{[3
]}

Bernert, M. ^{[4
]}

Boedo, J. A. ^{[2
]}

Brida, D. ^{[4
]}

Falchetto, G. ^{[5
]}

Hakola, A. ^{[6
]}

Harrer, G. ^{[7
]}

Reimerdes, H. ^{[3
]}

Theiler, C. ^{[3
]}

Tsitrone, E. ^{[5
]}

Walkden, N. ^{[8
]}

机构：

[1] Univ Padua, Consorzio RFX CNR, Ist Nazl Fis Nucl, ENEA,Acciaierie Venete SpA, Corso Stati Uniti 4, I-35127 Padua, Italy

[2] Univ Calif San Diego, Ctr Energy Res, La Jolla, CA 92093 USA

[3] Ecole Polytecn Fed Lausanne, Swiss Plasma Ctr, CH-1015 Lausanne, Switzerland

[4] Max Planck Inst Plasma Phys, Boltzmannstr 2, D-85748 Garching, Germany

[5] CEA, IRFM, F-13108 St Paul Les Durance, France

[6] VTT Tech Res Ctr Finland Ltd, POB 1000, FI-02044 Espoo, Finland

[7] TU Wien, Inst Appl Phys, Fus OAW, Wiedner Hauptstr 8-10, A-1040 Vienna, Austria

[8] Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England

来源：

NUCLEAR FUSION | 2022年 / 62卷 / 09期

基金：

瑞士国家科学基金会;

关键词：

H-mode; ELMs; QCE; scrape-off layer; E-folding lengths; blob-filaments; TOKAMAK EDGE TURBULENCE; ASDEX-UPGRADE; TRANSPORT; PARTICLE; PHYSICS; SOL;

D O I：

10.1088/1741-4326/ac8234

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：

A set of high density, highly shaped H-mode discharges has been performed in the TCV tokamak with the aim of assessing the effects of increasing divertor neutral recycling on the properties of upstream inter-ELM scrape-off layer (SOL) profiles and transport. An increase of divertor neutral pressure has been correlated with the evolution of separatrix properties and turbulence level. The latter has been quantified by means of the alpha (t) parameter introduced in (Eich 2020 Nucl. Fusion 60 056016), describing the contribution of resistive-interchange turbulence in the SOL relative to drift wave transport. The analysis reveals a general broadening of the upstream SOL profiles as alpha (t) increases, with the SOL power width measured by the vertical IR thermography system increasing significantly. In a similar way, the upstream density profile widens in the near SOL, whereas in the far SOL a density shoulder is observed to progressively form and increase in amplitude. This behaviour is associated with an enhancement of far SOL turbulent transport in the form of blob-filaments travelling radially faster across the far SOL and becoming bigger at higher alpha (t). The detected filaments, evaluated from the fast reciprocating probe at the outer midplane, are determined to mostly belong to the resistive ballooning and resistive X-point regimes.

引用

页数：14

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