[Table of Contents]

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
Tsukuba University, Tsukuba 305-8577, Japan
National Institute for Fusion Science, Gifu 509-5292, Japan
(Received 3 December 2007 / Accepted 28 December 2007 / Published 4 February 2008)


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.


ultrashort-pulse reflectometer, SRA method, FDTD

DOI: 10.1585/pfr.3.008


  • [1] S. Kubota et al., Rev. Sci. Instrum. 70, 1042 (1999).
  • [2] Y. Yokota, A. Mase, Y. Kogi et al., J. Plasma Fusion Res. 1, 40 (2006).
  • [3] A. Mase et al., Rev. Sci. Instrum. 77, 10E916 (2006).
  • [4] L.G. Bruskin, A. Mase, A. Yamamoto and Y. Kogi, Plasma Phys. Control. Fusion 43, 1333 (2001).
  • [5] H. Hojo et al., J. Plasma Fusion Res. 78, 387 (2002).
  • [6] A. Fukuchi, H. Hojo et al., J. Plasma Fusion Res. Series 6, 745 (2004).
  • [7] T. Watanabe and H. Akao, J. Plasm Fusion Res. 73, 183 (1997).

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).