Pedestal structure and energy confinement studies on TCV

被引：28

作者：

Sheikh, U. A. ^{[1
]}

Dunne, M. ^{[2
]}

Frassinetti, L. ^{[3
]}

Blanchard, P. ^{[1
]}

Duval, B. P. ^{[1
]}

Labit, B. ^{[1
]}

Merle, A. ^{[1
]}

Sauter, O. ^{[1
]}

Theiler, C. ^{[1
]}

Tsui, C. ^{[1
]}

机构：

[1] Ecole Polytech Fed Lausanne, SPC, CH-1015 Lausanne, Switzerland

[2] Max Planck Inst Plasma Phys, Garching, Germany

[3] KTH Royal Inst Technol, Stockholm, Sweden

来源：

PLASMA PHYSICS AND CONTROLLED FUSION | 2019年 / 61卷 / 01期

关键词：

TCV; pedestal; EPED; CODE;

D O I：

10.1088/1361-6587/aae7bd

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：

High external gas injection rates are foreseen for future devices to reduce divertor heat loads and this can influence pedestal stability. Fusion yield has been estimated to vary as strongly as T-e,ped(2) so an understanding of the underlying pedestal physics in the presence of additional fuelling and seeding is required. To address this, a database scanning plasma triangularity, fuelling and nitrogen seeding rates in neutral beam (NBH) heated ELM-y H-mode plasmas was constructed on TCV. Low nitrogen seeding was observed to increase pedestal top pressure but all other gas injection rates led to a decrease. Lower triangularity discharges were found to be less sensitive to variations in gas injection rates. No clear trend was measured between plasma top P-e and stored energy which is attributed to the non-stiffness of core plasma pressure profiles. Peeling ballooning stability analysis put these discharges close to the ideal MHD stability boundary. A constant for D in the relation pedestal width w = D root beta(Ped)(theta), was not found. Experimentally inferred values of D were used in EPED1 simulations and gave good agreement for pedestal width. Pedestal height agreed well for high triangularity but was overestimated for low triangularity. IPED simulations showed that relative shifts in pedestal position were contributing significantly to the pedestal height and were able to reproduce the measured profiles more accurately.

引用

页数：9

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