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Reconstruction of Edge Density Profiles Using Ultrashort-Pulse Reflectometry in LHD

Yuya YOKOTA, Atsushi MASE , Yuichiro KOGI, Tokihiko TOKUZAWA¹⁾ and Kazuo KAWAHATA¹⁾

Art, Science and Technology Center for Cooperative Research, Kyushu University

1)

National Institute for Fusion Science

(Received 17 June 2006 / Accepted 2 August 2006 / Published 11 September 2006)

Abstract

An ultrashort-pulse reflectometer (USPR) has been applied to the measurement of the edge density profile of the Large Helical Device at the National Institute for Fusion Science. The reflectometer signal is recorded directly using a high-speed digitizing scope, and is analyzed by means of a signal record analysis method to reconstruct the density profiles. This method has the advantage of using raw signal records instead of poorly localized frequency modes. The density profiles in the edge region are successfully determined and compared with those obtained by an FIR laser interferometer.

Copyright (c) 2006 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

plasma diagnostics, reflectometry, microwave, plasma density, LHD

DOI: 10.1585/pfr.1.040

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References

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This paper may be cited as follows:

Yuya YOKOTA, Atsushi MASE , Yuichiro KOGI, Tokihiko TOKUZAWA and Kazuo KAWAHATA, Plasma Fusion Res. 1, 040 (2006).