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Plasma-Confinement Physics Study in Compact Helical System
stoichi Okamura,A. Fujisawa,A. Shimizu,C. Takahashi,C. Suzuki,H. Iguchi,H. Nakano,H. Matsushita,K. Nagaoka,K. Matsuo,K. Ida,K. Toi,K. Nakamura,K. Matsuoka,M. Yoshinuma,M. Isobe,M. Takeuchi,R. Ikeda,S. 한국물리학회 2006 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.49 No.III
In a CHS experiment, various types of transport barrier have been studied. An internal transport barrier (ITB) for electrons in a stellarator was first found in CHS, and the ITB for improved ion confinement was also found. H-mode (edge transport barrier) study in CHS showed many common features in transition to tokamak experiments, although the magnetic surface quantities are very different. Discharges with a combination of ETB and ITB were also found. Two heavy ion beam diagnostics in CHS showed a new direct measurement of zonal flow structure in toroidal confinement. The relation between the fluctuation and the transport barrier was also studied.
Progress in development of neutron energy spectrometer for deuterium plasma operation in KSTAR.
Tomita, H,Yamashita, F,Nakayama, Y,Morishima, K,Yamamoto, Y,Sakai, Y,Cheon, M S,Isobe, M,Ogawa, K,Hayashi, S,Kawarabayashi, J,Iguchi, T American Institute of Physics 2014 Review of scientific instruments Vol.85 No.11
<P>Two types of DD neutron energy spectrometer (NES) are under development for deuterium plasma operation in KSTAR to understand behavior of beam ions in the plasma. One is based on the state-of-the-art nuclear emulsion technique. The other is based on a coincidence detection of a recoiled proton and a scattered neutron caused by an elastic scattering of an incident DD neutron, which is called an associated particle coincidence counting-NES. The prototype NES systems were installed at J-port in KSTAR in 2012. During the 2012 and 2013 experimental campaigns, multiple shots-integrated neutron spectra were preliminarily obtained by the nuclear emulsion-based NES system.</P>
Design and Development of a High-Speed Data-Acquisition System for the Korean VLBI Network
Oh, S.-J.,Roh, D.-G.,Wajima, K.,Kawaguchi, N.,Byun, D.-Y.,Yeom, J.-H.,Je, D.-H.,Han, S.-T.,Iguchi, S.,Kawakami, K. UNIVERSAL ACADEMY PRESS, INC. 2011 Publications of the Astronomical Society of Japan Vol.63 No.6