Plasma and Fusion Research

Volume 3, 008 (2008)

Rapid Communications


Simulation Study of Ultrashort-Pulse Reflectometry by Signal Record Analysis
Yuya YOKOTA, Atsushi MASE, Yuichiro KOGI, Hitoshi HOJO1), Leonid BRUSKIN, Tokihiko TOKUZAWA2) and Kazuo KAWAHATA2)
Kyushu University, Fukuoka 816-8580, Japan
1)
Tsukuba University, Tsukuba 305-8577, Japan
2)
National Institute for Fusion Science, Gifu 509-5292, Japan
(Received 3 December 2007 / Accepted 28 December 2007 / Published 4 February 2008)

Abstract

Reflectometry is expected to be come one of the key diagnostic tools for measuring density profiles in large fusion devices. It provides good spatial and temporal resolutions, while requires only a single viewing chord and minimal vacuum access, in contrast to interferometry and Thomson scattering. We applied an ultrashort-pulse reflectometer (USPR) to Large Helical Device (LHD) at the National Institute for Fusion Science (NIFS), and a signal record analysis (SRA) method was used as a reconstruction method. Here, we report a simulation study of USPR conducted using a finite-difference time domain (FDTD) method to confirm the effectiveness of the SRA reconstruction method.


Keywords

ultrashort-pulse reflectometer, SRA method, FDTD

DOI: 10.1585/pfr.3.008


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This paper may be cited as follows:

Yuya YOKOTA, Atsushi MASE, Yuichiro KOGI, Hitoshi HOJO, Leonid BRUSKIN, Tokihiko TOKUZAWA and Kazuo KAWAHATA, Plasma Fusion Res. 3, 008 (2008).