英国物理学会
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作者:S. Kubo , M. Nishiura ...
来源:[J].Journal of Instrumentation(IF 1.869), 2016, Vol.11 (06)IOP
摘要:High-power gyrotrons prepared for the electron cyclotron heating at 77 GHz has been used for a collective Thomson scattering (CTS) study in LHD. Due to the difficulty in removing fundamental and/or second harmonic resonance in the viewing line of sight, the subtraction of the bac...
作者:S. Kubo , K. Tanaka ...
来源:[J].Nuclear Fusion(IF 2.734), 2014, Vol.54 (2)IOP
摘要:A collective Thomson scattering (CTS) diagnostic was developed and used to measure the bulk and fast ions originating from 180 keV neutral beams in the Large Helical Device (LHD). Electromagnetic waves from a gyrotron at 77 GHz with 1 MW power output function as both the pro...
作者:S. Kubo , T. Shimozuma ...
来源:[J].Nuclear Fusion(IF 2.734), 2014, Vol.54 (11)IOP
摘要:Non-linear coupling between fluctuations at different radial locations is observed on the Large Helical Device (LHD) plasma. The summed bi-coherence between the low frequency macro-scale fluctuation (frequency is f = 2.75 kHz) at ρ = r eff/ a 99 = 0.63 ...
作者:S. Kubo , Y. Yoshimura ...
来源:[J].Nuclear Fusion(IF 2.734), 2015, Vol.55 (6)IOP
摘要:Effectiveness of high harmonic electron cyclotron resonance heating (ECRH) was investigated by both experiments and ray-trace analyses. The conditions of both the EC wave injection and the magnetic field configuration were optimized in the large helical device. In the case o...
作者:S. Kubo , H. Igami ...
来源:[J].Nuclear Fusion(IF 2.734), 2015, Vol.55 (11)IOP
摘要:The discharge scenario of high temperature plasma with a helical configuration has significantly progressed. The increase of central ion temperature due to the reduction of wall recycling was clearly observed. The peaking of the ion heating profile and the reduction of charge exc...
作者:S. Kubo , T. Shimozuma ...
来源:[J].Journal of Instrumentation(IF 1.869), 2015, Vol.10 (10)IOP
摘要:A high-power pulsed gyrotron is under development for 300 GHz-band collective Thomson scattering (CTS) diagnostics in the Large Helical Device (LHD). High-density plasmas in the LHD require a probe wave with power exceeding 100 kW in the sub-terahertz region to obtain sufficient ...
作者:S. Kubo , H. Takahashi ...
来源:[J].Nuclear Fusion(IF 2.734), 2015, Vol.55 (12)IOP
摘要:The central electron temperature has successfully reached up to 7.5 keV in large helical device (LHD) plasmas with a central high-ion temperature of 5 keV and a central electron density of m−3. This result was obtained by heating with a newly-installed 154 GHz gyr...
作者:S. Kubo , T. Shimozuma
来源:[J].Journal of Instrumentation(IF 1.869), 2015, Vol.10 (12)IOP
摘要:Microwave collective Thomson scattering (CTS) by using a 77 GHz gyrotron is routinely working in LHD and the improvements of the system is now underway. The targets of this diagnostic are measurements of energetic fast ion distribution and ion ratio. In the present system, 800kW ...
作者:S. Kubo , K. Tanaka ...
来源:[J].Journal of Instrumentation(IF 1.869), 2015, Vol.10 (12)IOP
摘要:A notch filter in 70 GHz range is developed to eliminate undesirable signals for plasma diagnostics using millimeter waves. We require a robust and narrow band characteristic for the notch filter. Since the previous notch filter which we reported contains the spurious notche...
作者:S. Kubo , T. Shimozuma ...
来源:[J].Nuclear Fusion(IF 2.734), 2016, Vol.56 (4)IOP
摘要:Using ion cyclotron heating and electron cyclotron heating (ECH), or solo ECH, trials of steady state plasma sustainment have been conducted in the superconducting helical/stellarator, large helical device (LHD) (Ida K et al 2015 Nucl. Fusion 55 104018). In recent years, the...

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