| Project/Area Number |
05452389
|
|---|
| Research Category |
Grant-in-Aid for General Scientific Research (B)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Nuclear fusion studies
|
|---|
| Research Institution | Hokkaido University |
|---|
Principal Investigator |
IGARASHI Hajime (1994) Hokkaido Univ., Fac.of Eng., Instructor, 工学部, 助手 (90212737)
本間 利久 (1993) 北海道大学, 工学部, 教授 (00091497)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
KAWAGUCHI Hideki Hokkaido Univ., Fac.of Eng., Instructor, 工学部, 助手 (90234046)
TSUCHIMOTO Masanori Hokkaido Univ., Fac.of Eng., Lecturer, 工学部, 講師 (40207402)
HONMA Toshihisa Hokkaido Univ., Fac.of Eng., professor, 工学部, 教授 (00091497)
五十嵐 一 北海道大学, 工学部, 助手 (90212737)
|
|---|
| Project Period (FY) |
1993 – 1994
|
| Project Status |
Completed (Fiscal Year 1994)
|
| Budget Amount *help |
¥7,400,000 (Direct Cost: ¥7,400,000)
Fiscal Year 1994: ¥900,000 (Direct Cost: ¥900,000)
Fiscal Year 1993: ¥6,500,000 (Direct Cost: ¥6,500,000)
|
|---|
| Keywords | Bootstrap currents / MHD plasma / MHD equilibrium / Free boundary / Banana orbit / Neoclassical theory / Steady-state operation / Friction and viscosity matrix |
|---|
| Research Abstract |
In order to realize steady-state operations in tokamak-type nuclear fusion reactors, there is the method to use bootstrap currents form neoclassical transport theory, which are driven by the thermodynamic force of plasma. This means that plasma itself can sustain the toroidal current for long time.
Development of the numerical MHD equilibrium code for free boundary plasma was carried out in 1993. We have compared several viscosity models and applied the Hirshman's rational approximations to the present analysis. In 1994, following analyzes were carried out by using the the numerical code. The bootstrap currents were compared with Ohmic and diamagnetic currents using iterative calculation with Hirshman's viscosity model. The bootstrap currents flow near the plasma surface more than at the center of plasma. That is why the plasma pressure gradient becomes low and no momentum exchange among trapped particles happen near the center of plasma. In comparison of the case with toroidal current Ip=22 (MA) and 15 (MA), ratio of the bootstrap currents of 15 (MA) is larger than that of 22 (MA) because of the poloidal magnetic field. Study for relation between plasma density and temperature was also carried out.
Further analysis under consideration of the effects of impurity will be carried out by using the friction and viscosity matrix in the near future.
|
