| Budget Amount *help |
¥46,930,000 (Direct Cost: ¥36,100,000、Indirect Cost: ¥10,830,000)
Fiscal Year 2014: ¥5,590,000 (Direct Cost: ¥4,300,000、Indirect Cost: ¥1,290,000)
Fiscal Year 2013: ¥5,980,000 (Direct Cost: ¥4,600,000、Indirect Cost: ¥1,380,000)
Fiscal Year 2012: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2011: ¥13,390,000 (Direct Cost: ¥10,300,000、Indirect Cost: ¥3,090,000)
Fiscal Year 2010: ¥16,120,000 (Direct Cost: ¥12,400,000、Indirect Cost: ¥3,720,000)
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| Outline of Final Research Achievements |
We found significant reconnection heating energy that scales with square of reconnecting (poloidal) magnetic field and used it to form an ultra-high beta (~40%) spherical tokamak (ST) partly through the field-reversed configuration. The high-beta STs produced within short reconnection time suffer from high-beta ballooning kink instabilities with toroidal mode numbers 20-100, causing plasma ejections as well as significant decrease in plasma density and thermal energy. However, we succesfully suppress them when the merging and/or a neutral beam (NB) injection form hollow current and thermal pressure profiles close to the absolute minimum-B configuration. The toroidal shear flow controlled by NB and the conductive shells on the seperatrix are also found to suppress those high-n mode, though we should avoid the mode lock to the conductive wall which is dangerous to the high beta STs.
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