TY - JOUR
T1 - Electron cyclotron emission diagnostics for helical plasma in the large helical device
AU - Nagayama, Yoshio
AU - Kawahata, K.
AU - Inagaki, Shigeru
AU - Morisaki, Tomohiro
AU - Narihara, K.
N1 - Funding Information:
Manuscript received August 27, 2003; revised November 28, 2003. This work was supported in part by the Ministry of Education, Science, Sports and Culture under Grant-in-Aid for Scientific Research (B) 11480116 and Grant-in-Aid for Scientific Research (B) 14208055. The authors are with the Large Helical Device Group, National Institute for Fusion Science, Toki 509-5292, Japan (e-mail: nagayama@ nifs.ac.jp). Digital Object Identifier 10.1109/TPS.2004.833380
PY - 2004/8
Y1 - 2004/8
N2 - Electron cyclotron emission (ECE) diagnostics have been developed in the large helical device (LHD). The ECE is transmitted over 80 m from the antenna to the spectrometer with the corrugated waveguide system, which has a low transmission loss (∼30%). The polarization of ECE is identical for all frequencies, while the field angle varies from -40° to +30° on the ECE sight line. The ECE temperature measured by the Michelson, which is calibrated with a hot source, agrees well with Thomson scattering measurement in a wide range of the electron density. Magnetic island formation is investigated using the electron temperature profile measured with the Michelson. The radiometer is cross-calibrated to the Michelson and is employed for the study of fast phenomena, such as the sawtooth oscillation. Besides the normal ECE, tangential ECE is investigated in LHD in order to explore the potential of ECE diagnostics.
AB - Electron cyclotron emission (ECE) diagnostics have been developed in the large helical device (LHD). The ECE is transmitted over 80 m from the antenna to the spectrometer with the corrugated waveguide system, which has a low transmission loss (∼30%). The polarization of ECE is identical for all frequencies, while the field angle varies from -40° to +30° on the ECE sight line. The ECE temperature measured by the Michelson, which is calibrated with a hot source, agrees well with Thomson scattering measurement in a wide range of the electron density. Magnetic island formation is investigated using the electron temperature profile measured with the Michelson. The radiometer is cross-calibrated to the Michelson and is employed for the study of fast phenomena, such as the sawtooth oscillation. Besides the normal ECE, tangential ECE is investigated in LHD in order to explore the potential of ECE diagnostics.
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U2 - 10.1109/TPS.2004.833380
DO - 10.1109/TPS.2004.833380
M3 - Article
AN - SCOPUS:7244242199
SN - 0093-3813
VL - 32
SP - 1716
EP - 1720
JO - IEEE Transactions on Plasma Science
JF - IEEE Transactions on Plasma Science
IS - 4 III
ER -