@article{oai:nifs-repository.repo.nii.ac.jp:00011513,
 author = {MAKINO,  Ryohei and KUBO,  Shin and KOBAYASHI, Kenya and KOBAYASHI,  Sakuji and SHIMOZUMA,  Takashi and YOSHIMURA,  Yasuo and IGAMI,  Hiroe and TAKAHASHI,  Hiromi and OGASAWARA,  Shinya and MUTOH,  Takashi},
 issue = {Special Issue 2},
 journal = {Plasma and Fusion Research},
 month = {Mar},
 note = {For optimization of electron cyclotron resonance heating (ECRH), it is important to measure power and polarization states of injected millimeter-waves in real-time. Arbitrary polarization states of millimeter-waves are realized by two grating mirror polarizers set at miter-bends in the corrugated waveguide transmission system on the Large Helical Device (LHD). The polarization state of an injected millimeter-wave determines the mode excitation purity, and therefore the power absorption efficiency in plasmas. The real-time power/polarization monitor of the injected millimeter-wave is required for optimization and/or feedback control of ECRH. The real-time power/polarization monitor is under development to be installed on a miter-bend near the ECRH antenna on LHD. Amplitudes and phases of two orthogonal polarizations of injected millimeter-waves are measured to determine the power and polarization states of waves. In this paper, the design and performance test of the real-time power/polarization monitor are reported. Intensities and relative phase of two orthogonal polarizations are measured by a newly developed monitor with heterodyne interferometer and fast ADC (800 MHz) with FPGA. Hardware of the power/polarization monitor works as designed qualitatively.},
 title = {Development of a Real-Time Power/Polarization Monitor using FPGA for Electron Cyclotron Resonance Heating on LHD},
 volume = {9},
 year = {2014}
}