Effect of global plasma parameters on the transition of edge pedestal properties in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="bold-italic">j</mml:mi></mml:mrow><mml:mrow><mml:mi>ϕ</mml:mi></mml:mrow></mml:msub><mml:mo>−</mml:mo><mml:mi mathvariant="bold-italic">α</mml:mi></mml:mrow></mml:math> space

Kim, SangKyeun; Na, Yong-Su; Kwon, Oh Jin

doi:10.1016/j.cap.2018.11.007

Cited by 1 publication

(1 citation statement)

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“…Here, ψ N is normalized poloidal flux. Because the pedestal collapses when its gradient reaches the marginal stability criteria, PBM stability limits the maximum pedestal height and gradient [10][11][12]. In our study, the PBM stability is treated as being equivalent to the pedestal stability.…”

Section: Introductionmentioning

confidence: 98%

Effect of pressure gradient in the connection region on the stability of the edge pedestal

Kim¹,

Saarelma²,

Na³

et al. 2020

Nucl. Fusion

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We have numerically investigated the dependence of pedestal properties such as the pedestal height and the pedestal width on the normalized pressure gradient (α) in the connection region, α c . We used an ideal MHD stability code, MISHKA, and the pedestal predictive model, EPED1, to analyze the effect of α c on the edge stability and predict pedestal structure. Edge stability is affected by α c because the unstable mode extends radially into the core. Improvement of pedestal properties can be achieved by reducing α c . Effect of α c on the edge instability is largest for the intermediate mode n. Larger gradient of Shafranov shift, ∆ ′ s , also improves the pedestal width and height by stabilizing peeling-ballooning mode (PBM). Our result has been applied to JET hybrid discharges to explain the coupling between core and edge pressure profile in H-mode plasma configuration through α c and ∆ ′ s . The extended correlation loop between poloidal beta and the pedestal parameters is presented.

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Section: Introductionmentioning

confidence: 98%