英国物理学会
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作者:N. Tamura , M. Yoshinuma ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (5)
摘要:Strong suppression of impurity accumulation is observed in long pulse hydrogen discharges with high power NBI (neutral beam injection) heating ( P nbi > 10 MW) on the large helical device (LHD), even in the impurity accumulation window where the intrinsic impuriti...
作者:N. Tamura , H.J. Zwart ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (12)
摘要:A new methodology to analyze non-linear components in perturbative transport experiments is introduced. The methodology has been experimentally validated in the Large Helical Device for the electron heat transport channel. Electron cyclotron resonance heating with different modul...
作者:N. Tamura , Th. Wegner ...
来源:[J].Nuclear Fusion(IF 2.734), 2019, Vol.59 (7)
摘要:Plasma terminating events due to excess pellet fueling and impurity injection is studied in the Large Helical Device, Wendelstein 7-X and TJ-II. Time scales for these events range from values of a decimal fraction of typical energy confinement times to the order of the energy con...
作者:N. Tamura , H. Thomsen ...
来源:[J].Nuclear Fusion(IF 2.734), 2019, Vol.59 (11)
摘要:The optimized superconducting stellarator device Wendelstein 7-X (with major radius , minor radius , and plasma volume) restarted operation after the assembly of a graphite heat shield and 10 inertially cooled island divertor modules. This paper reports on the results from the f...
作者:... Zheng-Xiong Wang , J.M. Kwon , N. Tamura
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (8)
摘要:This report summarizes the contributions to, and discussions at, the 6th Asia-Pacific Transport Working Group (APTWG) meeting, held on 21–25 June 2016 at Korea University, Seoul, Republic of Korea. The objective of the meeting was to develop an integrated understanding of tr...
作者:N. Tamura , S. K. Combs ...
来源:[J].EPL (Europhysics Letters)(IF 2.26), 2017, Vol.120 (2)
摘要:A cryogenic pellet injector (PI) and tracer encapsulated solid pellet (TESPEL) injector system has been operated in combination on the stellarator TJ-II. This unique arrangement has been created by piggy-backing a TESPEL injector onto the backend of a pipe-gun–type PI. The c...
作者:N. Tamura , G.H. Choe ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (7)
摘要:In this contribution we analyze modulation electron cyclotron resonance heating (MECH) experiment and discuss higher harmonic frequency dependence of transport coefficients. We use the bidirectional heat pulse propagation method, in which both inward propagating heat pulse and ou...
作者:N. Tamura , H. Igami ...
来源:[J].Nuclear Fusion(IF 2.734), 2018, Vol.58 (12)
摘要:In this paper, we investigate data from the density scan experiment in order to clarify how the transport hysteresis width depends on the density. As the line averaged density increases, the hysteresis width almost monotonically decreases. To discuss the physical mechanism of the...
作者:N. Tamura , H. Tsuchiya ...
来源:[J].Nuclear Fusion(IF 2.734), 2018, Vol.58 (9)
摘要:The heat flux is one of the key parameter used to quantify and understand transport in fusion devices. In this paper, a new method is introduced to calculate the heat flux including its confidence with high accuracy based on perturbed measurements such as the electron temperature...
作者:N. Tamura , H. Nakano ...
来源:[J].Nuclear Fusion(IF 2.734), 2019, Vol.59 (5)
摘要:The isotope effect on impurities and bulk ion particle transport is investigated by using the deuterium, hydrogen, and isotope mixture plasma in the Large Helical Device (LHD). A clear isotope effect is observed in the impurity transport but not the bulk ion transport. The i...

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