Analytical solution of high βp equilibria with natural inboard poloidal null configuration obtained in the spherical tokamak QUEST

QUEST Team

doi:10.1585/pfr.9.3402093

Analytical solution of high β_p equilibria with natural inboard poloidal null configuration obtained in the spherical tokamak QUEST

QUEST Team

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

High β_p (εβ_p ~ 1) equilibria obtained in a ECW heated Ohmic plasma is investigated using a simple analytic solution of Grad-Shafranov equation. The formation of a natural inboard poloidal null associated with high β_p is explained consistently by high diamagnetism and negative triangularity. As β_p is increased, the poloidal null point penetrates further into the vacuum vessel, which is qualitatively explained by the analytic model. Transition from inboard (high field side) limiter bound to the natural divertor configuration is associated with a reduction of the edge safety factor without appreciable enhancement of MHD activities. Such a scenario is also addressed successfully with the model.

Original language	English
Article number	3402093
Journal	Plasma and Fusion Research
Volume	9
Issue number	SpecialIssue2
DOIs	https://doi.org/10.1585/pfr.9.3402093
Publication status	Published - Jan 1 2014

All Science Journal Classification (ASJC) codes

Condensed Matter Physics

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10.1585/pfr.9.3402093

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title = "Analytical solution of high βp equilibria with natural inboard poloidal null configuration obtained in the spherical tokamak QUEST",

abstract = "High βp (εβp ~ 1) equilibria obtained in a ECW heated Ohmic plasma is investigated using a simple analytic solution of Grad-Shafranov equation. The formation of a natural inboard poloidal null associated with high βp is explained consistently by high diamagnetism and negative triangularity. As βp is increased, the poloidal null point penetrates further into the vacuum vessel, which is qualitatively explained by the analytic model. Transition from inboard (high field side) limiter bound to the natural divertor configuration is associated with a reduction of the edge safety factor without appreciable enhancement of MHD activities. Such a scenario is also addressed successfully with the model.",

author = "{QUEST Team} and Kishore Mishra and Hideki Zushi and Hiroshi Idei and Saya Tashima and Santanu Banerjee and Makoto Hasegawa and Kazuaki Hanada and Kazuo Nakamura and Akihide Fujisawa and Yoshihiko Nagashima and Keisuke Matsuoka and Arseny Kuzmin and Takumi Onchi",

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month = jan,

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doi = "10.1585/pfr.9.3402093",

language = "English",

volume = "9",

journal = "Plasma and Fusion Research",

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publisher = "The Japan Society of Plasma Science and Nuclear Fusion Research (JSPF)",

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TY - JOUR

T1 - Analytical solution of high βp equilibria with natural inboard poloidal null configuration obtained in the spherical tokamak QUEST

AU - QUEST Team

AU - Mishra, Kishore

AU - Zushi, Hideki

AU - Idei, Hiroshi

AU - Tashima, Saya

AU - Banerjee, Santanu

AU - Hasegawa, Makoto

AU - Hanada, Kazuaki

AU - Nakamura, Kazuo

AU - Fujisawa, Akihide

AU - Nagashima, Yoshihiko

AU - Matsuoka, Keisuke

AU - Kuzmin, Arseny

AU - Onchi, Takumi

PY - 2014/1/1

Y1 - 2014/1/1

N2 - High βp (εβp ~ 1) equilibria obtained in a ECW heated Ohmic plasma is investigated using a simple analytic solution of Grad-Shafranov equation. The formation of a natural inboard poloidal null associated with high βp is explained consistently by high diamagnetism and negative triangularity. As βp is increased, the poloidal null point penetrates further into the vacuum vessel, which is qualitatively explained by the analytic model. Transition from inboard (high field side) limiter bound to the natural divertor configuration is associated with a reduction of the edge safety factor without appreciable enhancement of MHD activities. Such a scenario is also addressed successfully with the model.

AB - High βp (εβp ~ 1) equilibria obtained in a ECW heated Ohmic plasma is investigated using a simple analytic solution of Grad-Shafranov equation. The formation of a natural inboard poloidal null associated with high βp is explained consistently by high diamagnetism and negative triangularity. As βp is increased, the poloidal null point penetrates further into the vacuum vessel, which is qualitatively explained by the analytic model. Transition from inboard (high field side) limiter bound to the natural divertor configuration is associated with a reduction of the edge safety factor without appreciable enhancement of MHD activities. Such a scenario is also addressed successfully with the model.

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U2 - 10.1585/pfr.9.3402093

DO - 10.1585/pfr.9.3402093

M3 - Article

SN - 1880-6821

VL - 9

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

IS - SpecialIssue2

M1 - 3402093

ER -

Analytical solution of high β_p equilibria with natural inboard poloidal null configuration obtained in the spherical tokamak QUEST

Abstract

All Science Journal Classification (ASJC) codes

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