|Budget Amount *help
¥96,330,000 (Direct Cost: ¥74,100,000、Indirect Cost: ¥22,230,000)
Fiscal Year 2013: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
Fiscal Year 2012: ¥9,620,000 (Direct Cost: ¥7,400,000、Indirect Cost: ¥2,220,000)
Fiscal Year 2011: ¥22,360,000 (Direct Cost: ¥17,200,000、Indirect Cost: ¥5,160,000)
Fiscal Year 2010: ¥31,200,000 (Direct Cost: ¥24,000,000、Indirect Cost: ¥7,200,000)
Fiscal Year 2009: ¥24,570,000 (Direct Cost: ¥18,900,000、Indirect Cost: ¥5,670,000)
The purpose of this research is to show that the plasma current needed for spherical tokamaks can be driven by high frequency waves. Plasma currents of over 10kA were driven successfully using the 200MHz lower hybrid wave. Comparing the experimental results obtained using 3 types of antennas, many important results that contribute to the physics understanding, such as self-formation of the spherical tokamak configuration, characterization of nonlinear wave phenomena by wave measurements and of fast electrons by X-ray diagnostics, optimization of wavenumber spectrum, and development of a new antenna, were obtained. Presently, the current drive efficiency is limited by fast electron losses, but according to numerical modeling, a large improvement is expected by operating at higher magnetic field and higher plasma current. These results open up a possibility of improving the economic competitiveness of a fusion reactor.