| Budget Amount *help |
¥30,810,000 (Direct Cost: ¥23,700,000、Indirect Cost: ¥7,110,000)
Fiscal Year 2011: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2010: ¥7,540,000 (Direct Cost: ¥5,800,000、Indirect Cost: ¥1,740,000)
Fiscal Year 2009: ¥20,150,000 (Direct Cost: ¥15,500,000、Indirect Cost: ¥4,650,000)
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| Research Abstract |
The objectives of the research are understanding and control of RF wave start-up/sustainment of spherical tokamak(ST) plasmas. We have succeeded in the sustainment of ST plasma with lower hybrid(LH) range of frequency wave, which is applied to an ST for the first time. After the improvement of accuracy and reliability of equilibrium analysis, we compared equilibria of different scenarios, and we found that the equilibria of RF sustained ST plasmas are characterized by a relatively high(one or larger than one) poloidal beta. By injecting directive LH wave, it was found that the wave generates high energy electrons, which contribute to the plasma current. The residual plasma current seems to be pressure driven current.
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