英国物理学会
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作者:Y. Kosuga , S.-I. Itoh ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (7)IOP
摘要:In fusion plasmas, several mechanisms such as heating, wave-particle interaction etc can drive deviations of distribution function from Maxwelian to form phase space structures. This article discusses the impact of phase space structures in drift wave turbulence on dynamics and t...
作者:... J.M. Kwon , N. Tamura , Y. Kosuga
来源:[J].Nuclear Fusion(IF 2.734), 2014, Vol.54 (4)IOP
摘要:This conference report summarizes the contributions to and discussions at the 3rd Asia–Pacific Transport Working Group (APTWG) meeting held in Jeju-island, Korea, on 21–24 May 2013. The main objective of the meeting is to develop a predictive understanding of transport mecha...
作者:Y. Kosuga , A. Fujisawa ...
来源:[J].Nuclear Fusion(IF 2.734), 2014, Vol.54 (11)IOP
摘要:Meso-scale streamer has a radially elongated structure and is believed to enhance the radial transport. In order to study the control of the streamer, we demonstrated an end plate biasing to the streamer state in the PANTA linear plasma. During the end plate biasing, the electron...
作者:... P.H. Diamond , Y. Kosuga , Ö.D. Gürcan
来源:[J].Nuclear Fusion(IF 2.734), 2015, Vol.55 (4)IOP
摘要:We present a theory of turbulence elasticity, which follows from delayed response of drift waves (DWs) to zonal flow (ZF) shears. It is shown that when |〈 V 〉′ZF|/Δ ω k ⩾ 1, with |〈 V 〉′ZF| the ZF shearing rate and Δ ω ...
作者:Y. Kosuga , M. Sasaki ...
来源:[J].Nuclear Fusion(IF 2.734), 2016, Vol.56 (5)IOP
摘要:In collisionless plasma, it is known that linearly stable modes can be destabilized (subcritically) by the presence of structures in phase-space. The growth of such structures is a nonlinear, kinetic mechanism, which provides a channel for free-energy extraction, different f...
作者:Y. Kosuga , M. Lesur ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (3)IOP
摘要:Toroidal momentum channeling by fast ion-driven geodesic acoustic mode (EGAM) is proposed based on a quasi-linear analysis. We focus on a branch due to the magnetic drift resonance. Without the magnetic drift resonance, the eigenfunction of the EGAM has up–down anti-symmetri...
作者:... S.-I. Itoh , M. Sasaki , Y. Kosuga
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (5)IOP
摘要:The hydrogen isotope effect on confinement is discussed by investigating the coupling between confinement, wall material and scrape-off-layer (SoL) turbulence. An emphasis is placed upon the dependence of the neutral density on the hydrogen mass number. The momentum loss via CX p...
作者:Y. Kosuga , M. Sasaki ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (7)IOP
摘要:The abrupt and strong excitation of the geodesic acoustic mode (GAM) has been found in the large helical device (LHD), when the frequency of a chirping energetic particle-driven GAM (EGAM) approaches twice that of the GAM frequency. The temporal evolution of the phase relation be...
作者:Y. Kosuga , M. Sasaki ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (7)IOP
摘要:New mesoscale electric fluctuations (MSEFs) are identified in the edge plasmas of the HL-2A tokamak using multiple Langmuir probe arrays. The MSEFs, resulting from the synchronization and having components of dominant geodesic acoustic mode (GAM) and m / n = 6/2 potential fluctua...
作者:Y. Kosuga , Y. Lin ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (11)IOP
摘要:Changes in the core intrinsic toroidal rotation velocity following L- to H- and L- to I-mode transitions have been investigated in Alcator C-Mod tokamak plasmas. The magnitude of the co-current rotation increments is found to increase with the pedestal temperature gradient a...

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