T. Akiyama K. Kawahata K. Tanaka T. Tokuzawa Y. Ito S. Okajima K. Nakayama C. A. Michael L. N. Vyacheslavov A. Sanin S. Tsuji-Iio LHD Experiment Group
This paper describes the interferometer systems on the Large Helical Device (LHD). LHD is equipped with five interferometer systems, each of which has a different operational purpose and measurable electron density range. A single-channel millimeter-wave interferometer is mainly used for low-density plasmas along a horizontal line of sight on the e…Published
T. Tokuzawa K. Kawahata Y. Nagayama S. Inagaki P. C. De Vries A. Mase Y. Kogi Y. Yokota H. Hojo K. Tanaka A. Ejiri R. O. Pavlichenko S. Yamaguchi T. Yoshinaga D. Kuwahara Z. Shi H. Tsuchiya Y. Ito S. Hirokura S. Sudo A. Komori Lhd
Several types of microwave diagnostics, in the category of electron cyclotron emission (ECE) spectroscopy and reflectometry, have been developed on the Large Helical Device (LHD). Since LHD has a complicated magnetic configuration, the polarization effects have been studied for optimization of the microwave passive and active diagnostics. It was fo…Published
K. Tanaka K. Kawahata T. Tokuzawa T. Akiyama M. Yokoyama M. Shoji C. A. Michael L. N. Vyacheslavov S. Murakami A. Wakasa A. Mishchenko K. Muraoka S. Okajima H. Takenaga Lhd Experiment Group
Particle confinement processes are studied in detail on the Large Helical Device (LHD). Diffusion coefficients (D) and convection velocities (V) are estimated from density modulation experiments. The magnetic configuration and collisionality are widely scanned in order to investigate parameter dependences of D and V. To study the effect of the magn…Published
Y. Nagayama K. Kawahata A. England Y. Ito N. Bretz et al.
The electron cyclotron emission ~ECE! diagnostic system is installed on the large helical device ~LHD!. The system includes the following instruments: a heterodyne radiometer, a Michelson spectrometer, and a grating polychromator. A 63.5 mm corrugated waveguide system is fully utilized. Large collection optics and notch filters at the frequency of …Published