Confinement Improvement Due to Ambipolar Radial Electric Field in Heliotron/Torsatron Plasmas

概要

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According to the neoclassical ripple transport, the positive radial electric field stateof E.>0 is favorable to obtain a good confinement compared to the negative radialelectric field state of E,< 0. The radial electric field depends sensitively on the densityand the characteristic length of density gradient, and a relatively flat density profile isdesirable to minimize a heating power to obtain f.>0. Our transport code studyshows that gross confinement time is improved about seven times compared to theLID scaling when E.>0 is achieved in the whole plasma region. Without control tokeep the density profile relatively flat the confinement improvement reduces to abouta factor of two compared to the LID scaling. Heating power required to achieveE.>0 in the whole plasma region is evaluated. Enhancement of the neoclassical rippletransport with increase of helical magnetic field ripple is favorable to reduce theheating power to achieve E.>0 in the whole plasma region.[he1iotron, stellarator, torsatron, radial electric field, LHD scaling, particle lj transport, energy transportl
社団法人日本物理学会の論文
1992-03-15