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作者:M. Nishiura , Y. Kawazura ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (8)
摘要:We have developed an ion cyclotron resonance frequency (ICRF) heating system for the Ring Trap 1 (RT-1) magnetospheric device. We excite slow waves from the polar region of the dipole magnetic field. The target helium plasma is produced by electron cyclotron heating. The electron...
作者:M. Nishiura , S. Kubo ...
来源:[J].Journal of Instrumentation(IF 1.869), 2018, Vol.13 (1)
摘要:Collective Thomson scattering (CTS) was developed by using a 154 GHz gyrotron, and the first data has been obtained. Already, 77 GHz CTS has worked successfully. However, in order to access higher density region, 154 GHz option enhances the usability that reduces the refraction e...
作者:M. Nishiura , I. Yamada ...
来源:[J].Nuclear Fusion(IF 2.734), 2017, Vol.57 (7)
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:M. Nishiura , Z. Yoshida ...
来源:[J].Nuclear Fusion(IF 2.734), 2015, Vol.55 (5)
摘要:This study reports the recent progress in improved plasma parameters of the RT-1 device. Increased input power and the optimized polarization of electron cyclotron resonance heating (ECRH) with an 8.2 GHz klystron produce a significant increase in electron beta, which is eva...
作者:M. Nishiura , S. Kubo ...
来源:[J].Journal of Instrumentation(IF 1.869), 2015, Vol.10 (12)
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:M. Nishiura , H. Idei ...
来源:[J].Nuclear Fusion(IF 2.734), 2015, Vol.55 (6)
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:M. Nishiura , K. Toi ...
来源:[J].Nuclear Fusion(IF 2.734), 2015, Vol.55 (8)
摘要:n = 0 modes with frequency chirping have been observed by a heavy ion beam probe and Mirnov coils in the large helical device plasmas, where n is the toroidal mode number. The spatial structures of the electrostatic potential fluctuation and the density fluctuation correspond to ...
作者:... T. Shimozuma , K. Tanaka , M. Nishiura
来源:[J].Journal of Instrumentation(IF 1.869), 2015, Vol.10 (10)
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:M. Nishiura , S. Kubo ...
来源:[J].Journal of Instrumentation(IF 1.869), 2015, Vol.10 (12)
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:M. Nishiura , K. Tanaka ...
来源:[J].Journal of Instrumentation(IF 1.869), 2016, Vol.11 (6)
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...

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