| Project/Area Number |
09680490
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Nuclear fusion studies
|
|---|
| Research Institution | KYOTO UNIVERSITY |
|---|
Principal Investigator |
NAKAMURA Yuji Kyoto University, Graduate School. of Energy Science, Associate Professor, エネルギー科学研究科, 助教授 (20198245)
|
|---|
| Project Period (FY) |
1997 – 1998
|
| Project Status |
Completed (Fiscal Year 1998)
|
| Budget Amount *help |
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥2,400,000 (Direct Cost: ¥2,400,000)
|
|---|
| Keywords | Rippled Tokamak / Helical System / MHD Equilibrium / Magnetic Island / Plasma Current / Heliotron |
|---|
| Research Abstract |
Purposes of this project are to develop a numerical method to analyze three dimensional MHD equilibria of non-axisymmetric torus plasmas in a rippled tokamak or helical system device self-consistently and to investigate the effect of plasma current on the MHD equilibrium. Followings are the results ;
(1) A series of numerical programs was prepared to analyze MHD equilibrium, particle orbit and neoclassical transport in tokamak plasmas, taking into account of breaking of axisymmetry like toroidal ripple. Analysis of high beta low aspect ratio tokamaks with negative shear has been performed as the first step. Additionally, orbits of high energy particles in a high q rippled tokamak with circular cross section are investigated.
(2) The effect of plasma net current on the magnetic island formation in an L=2 heliotron plasma is examined preliminarily by the field line tracing analysis with the stellarator expansion method and the vacuum field calculation code. Though the stellarator expansion technique is not available in a helical axis configuration, it is very important to investigate the magnetic island formation especially in the case of weak magnetic shear. As an example of such configurations, MHD equilibrium and particle orbits are studied for an L=1 helical axis heliotron plasma without considering magnetic islands. A three dimensional MHD equilibrium code which does not assume the existence of nested flux surfaces is necessary for its self - consistent analysis. PIES code has been introduced for this purpose and test calculations were performed for an LHD plasma. Additional improvements of PIES code is intended to be done.
|
