Electron Cyclotron Emission Diagnostics in the Large Helical Device
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- NAGAYAMA Yoshio
- National Institute for Fusion Science
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- KAWAHATA Kazuo
- National Institute for Fusion Science
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- INAGAKI Shigeru
- National Institute for Fusion Science
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- KUBO Shin
- National Institute for Fusion Science
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- NARIHARA Kazumichi
- National Institute for Fusion Science
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- OHYABU Nobuyoshi
- National Institute for Fusion Science
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- the LHD Group
- National Institute for Fusion Science
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Abstract
Electron cyclotron emission (ECE) diagnostics have been developed in the Large Helical Device (LHD). The ECE is transmitted from the antenna to the spectrometer for 80 m by means of a corrugated waveguide system, which has a small transmission loss (˜30%) in LHD. Although the field angle changes from −40 to +30 degrees on the sight-line of the ECE antenna, it has been observed that the polarization of ECE, which is determined at the plasma edge in LHD, is identical for all frequencies. Thus, the electron temperature profile can be measured using the second harmonic X-mode of ECE. The ECE measured by the Michelson is calibrated with a hot source in order to reduce noise. The ECE temperature measurement agrees well with the Thomson scattering measurement over a wide range of electron densities. The radiometer is cross-calibrated to the Michelson, and is employed for the study of fast phenomena such as internal transport barrier (ITB) formation. Tangentially emitted ECE, in addition to the normal ECE, is investigated in LHD in order to explore the potential of ECE diagnostics.
Journal
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- Journal of Plasma and Fusion Research
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Journal of Plasma and Fusion Research 79 (6), 601-607, 2003
The Japan Society of Plasma Science and Nuclear Fusion Research
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Details 詳細情報について
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- CRID
- 1390001206513111296
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- NII Article ID
- 130000133814
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- NII Book ID
- AN10401672
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- NDL BIB ID
- 6628864
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- ISSN
- 09187928
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed