| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2013: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2012: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2011: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2010: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Research Abstract |
Structure of magnetic islands associated with neoclassical tearing modes (NTMs) during their onset and evolution has been investigated. The NTM islands were found to be triggered by a small collapse associated with another instability, in addition to onset without detectable instabilities. It was found that the value of the normalized beta for the collapse-triggered NTM is larger than that for the trigger-less NTM, and that the pressure gradient at the mode location is steeper for the former case. The magnetic island width at which the plasma rotation suddenly slows down is larger than that at the plasma starts to rotate after the island width is decreased. This indicates that there is a hysteresis in the island width for mode locking and unlocking. The development of a device for active control of magnetic islands, a dual-frequency gyrotron, has made progressed, and a good prospect has been obtained toward the achievement of its nominal values.
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