### 抄録

A solution of two-fluid (electron and ion), axisymmetric equilibrium is presented that approximates solenoidfree plasmas sustained only by RF electron heating that are recently studied in TST-2, LATE, QUEST. These plasmas indicate presence of orbit-confined energetic electrons carrying substantial toroidal current outside the last closed flux surface (LCFS); T_{e}/Ti » 1 and low collisionality at modest densities within LCFS; and likely a positive plasma potential relative to the conductive vacuum vessel. A system of nonlinear second-order partial differential and algebraic equations constraining six functionals of poloidal magnetic flux or canonical angular momentum are solved. An example plasma measured in TST-2 is used to guide, by trial and error, the selection of these functionals to find appropriate solutions, while assuming peaked plasma profiles and 60% toroidal current within the LCFS. The numerical equilibrium obtained indicates a substantial ion toroidal flow and electrostatic potential so that the ion ∇p_{i}, centrifugal, and electrostatic forces of nearly equal magnitudes combine to balance the J_{i} × B force, differently from the massless electron fluid that satisfies ∇p_{e} = J_{e} × B. The calculated properties suggest additional measurements needed to refine the choices of the functional forms and improve the two-fluid equilibrium fit to such plasmas.

元の言語 | 英語 |
---|---|

記事番号 | 3403146 |

ジャーナル | Plasma and Fusion Research |

巻 | 9 |

発行部数 | SpecialIssue2 |

DOI | |

出版物ステータス | 出版済み - 1 1 2014 |

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### All Science Journal Classification (ASJC) codes

- Condensed Matter Physics

### これを引用

_{e}/Ti » 1, Collisionless ST Plasmas Sustained by RF Electron Heating.

*Plasma and Fusion Research*,

*9*(SpecialIssue2), [3403146]. https://doi.org/10.1585/pfr.9.3403146

**Two-Fluid Equilibrium Considerations of T _{e}/Ti » 1, Collisionless ST Plasmas Sustained by RF Electron Heating.** / Peng, Yueng Kay Martin; Ishida, Akio; Takase, Yuichi; Ejiri, Akira; Tsujii, Naoto; Maekawa, Takashi; Uchida, Masaki; Zushi, Hideki; Hanada, Kazuaki; Hasegawa, Makoto.

研究成果: ジャーナルへの寄稿 › 記事

_{e}/Ti » 1, Collisionless ST Plasmas Sustained by RF Electron Heating',

*Plasma and Fusion Research*, 巻. 9, 番号 SpecialIssue2, 3403146. https://doi.org/10.1585/pfr.9.3403146

_{e}/Ti » 1, Collisionless ST Plasmas Sustained by RF Electron Heating. Plasma and Fusion Research. 2014 1 1;9(SpecialIssue2). 3403146. https://doi.org/10.1585/pfr.9.3403146

}

TY - JOUR

T1 - Two-Fluid Equilibrium Considerations of Te/Ti » 1, Collisionless ST Plasmas Sustained by RF Electron Heating

AU - Peng, Yueng Kay Martin

AU - Ishida, Akio

AU - Takase, Yuichi

AU - Ejiri, Akira

AU - Tsujii, Naoto

AU - Maekawa, Takashi

AU - Uchida, Masaki

AU - Zushi, Hideki

AU - Hanada, Kazuaki

AU - Hasegawa, Makoto

PY - 2014/1/1

Y1 - 2014/1/1

N2 - A solution of two-fluid (electron and ion), axisymmetric equilibrium is presented that approximates solenoidfree plasmas sustained only by RF electron heating that are recently studied in TST-2, LATE, QUEST. These plasmas indicate presence of orbit-confined energetic electrons carrying substantial toroidal current outside the last closed flux surface (LCFS); Te/Ti » 1 and low collisionality at modest densities within LCFS; and likely a positive plasma potential relative to the conductive vacuum vessel. A system of nonlinear second-order partial differential and algebraic equations constraining six functionals of poloidal magnetic flux or canonical angular momentum are solved. An example plasma measured in TST-2 is used to guide, by trial and error, the selection of these functionals to find appropriate solutions, while assuming peaked plasma profiles and 60% toroidal current within the LCFS. The numerical equilibrium obtained indicates a substantial ion toroidal flow and electrostatic potential so that the ion ∇pi, centrifugal, and electrostatic forces of nearly equal magnitudes combine to balance the Ji × B force, differently from the massless electron fluid that satisfies ∇pe = Je × B. The calculated properties suggest additional measurements needed to refine the choices of the functional forms and improve the two-fluid equilibrium fit to such plasmas.

AB - A solution of two-fluid (electron and ion), axisymmetric equilibrium is presented that approximates solenoidfree plasmas sustained only by RF electron heating that are recently studied in TST-2, LATE, QUEST. These plasmas indicate presence of orbit-confined energetic electrons carrying substantial toroidal current outside the last closed flux surface (LCFS); Te/Ti » 1 and low collisionality at modest densities within LCFS; and likely a positive plasma potential relative to the conductive vacuum vessel. A system of nonlinear second-order partial differential and algebraic equations constraining six functionals of poloidal magnetic flux or canonical angular momentum are solved. An example plasma measured in TST-2 is used to guide, by trial and error, the selection of these functionals to find appropriate solutions, while assuming peaked plasma profiles and 60% toroidal current within the LCFS. The numerical equilibrium obtained indicates a substantial ion toroidal flow and electrostatic potential so that the ion ∇pi, centrifugal, and electrostatic forces of nearly equal magnitudes combine to balance the Ji × B force, differently from the massless electron fluid that satisfies ∇pe = Je × B. The calculated properties suggest additional measurements needed to refine the choices of the functional forms and improve the two-fluid equilibrium fit to such plasmas.

UR - http://www.scopus.com/inward/record.url?scp=84945260762&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84945260762&partnerID=8YFLogxK

U2 - 10.1585/pfr.9.3403146

DO - 10.1585/pfr.9.3403146

M3 - Article

AN - SCOPUS:84945260762

VL - 9

JO - Plasma and Fusion Research

JF - Plasma and Fusion Research

SN - 1880-6821

IS - SpecialIssue2

M1 - 3403146

ER -