Discrete particle simulation of tokamak plasma in a general geometry including separatrix = Separatrix를 포함하는 일반적인 형태의 토카막 플라즈마의 입자 시늉

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To study the ion transport in the edge of a diverted tokamak plasma, an X-point Guiding Center (XGC) code is developed, which is a discrete plasma particle simulation code of ions in a diverted edge with kinetic neutral particles. A self-consistent electric field is evaluated and conserving Monte-Carlo collisions are used. calculated simultaneously. Using the XGC code the property of a velocity space hole due to vanishingly small poloidal magnetic field in the vicinity of a divertor X-point is studied in a single null geometry. The velocity space hole occupies a significant portion of the main ion velocity space in the absence of an electric field, but a radial electric field shifts the velocity hole to a higher energy and suppresses the loss, especially on the midplane.On the outside midplane, it is found that there is virtually no v-space hole with a reasonable radial electric field. A forward ∇B drift case is compared with a backward ∇B drift case, only to find that there is little difference in the loss hole size in the velocity space. However, the forward ∇B plasma occupies a much larger loss volume in real space due to flux expansion near the X-point. The steep neoclassical pedestal formation in a quiescent tokamak is also investigated. It is shown that the width of the steepest neoclassical pedestals is similar to an experimentally observed H-mode edge pedestal width. It is also shown that a steep neoclassical pedestal can form from an L-mode profile at a quiescent diverted edge by with the neutral ionization. The suppression of the steep pedestal and the strong radial E-field by a simply modeled turbulence is observed. The effect of fueling location on the toroidal flow is investigated. The simulation result is that the neutral fueling from the high field side location gives more toroidal rotation than that from the low field side, which agrees with the experimental observation that the high field side fueling allowed an easier H-mode access. For a more...
Advisors
Chang, Choong-Seockresearcher장충석researcher
Description
한국과학기술원 : 물리학과,
Publisher
한국과학기술원
Issue Date
2004
Identifier
240467/325007  / 000985017
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 물리학과, 2004.8, [ iv, [121] p. ]

Keywords

PLASMA; TOKAMAK; DIVERTOR; SEPARATRIX; 입자 시늉; 플라즈마; 토카막; 다이버터; PARTICLEL SIMULATION

URI
http://hdl.handle.net/10203/47337
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=240467&flag=dissertation
Appears in Collection
PH-Theses_Ph.D.(박사논문)
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