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Advanced Laser Diagnostics for Electron Density Measurements

Kazuo KAWAHATA, Tsuyoshi AKIYAMA, Rostislav PAVLICHENKO, Kenji TANAKA, Yasuhiko ITO, Kazuya NAKAYAMA¹⁾, Shigeki OKAJIMA¹⁾ and Shunji TSUJI-IIO²⁾

National Institute for Fusion Science, Toki 509-5292, Japan

1)

College of Engineering, Chubu University, Kasugai 487-8501, Japan

2)

Tokyo Institute of Technology, Meguro-ku, Tokyo 152-8550, Japan

(Received 3 December 2006 / Accepted 8 May 2007 / Published 20 November 2007)

Abstract

This paper describes innovative laser diagnostics under development at the National Institute for Fusion Science, aiming for the establishment of reliable density measurement techniques in the next step magnetically confined fusion devices. There are two approaches, interferometry and polarimetry. A new type of two color laser (47.6/57.2-μm CH₃OD) interferometer has been developed and its original function, vibration subtraction, was confirmed in a test stand. The line integrated density measurement at Compact Helical System by using the polarimeter based on Cotton-Mouton effect was demonstrated by the use of a 337-μm HCN laser source.

Copyright (c) 2007 The Japan Society of Plasma Science and Nuclear Fusion Research

Keywords

plasma diagnostic, far-infrared laser, interferometry, two color, Cotton-Mouton effect

DOI: 10.1585/pfr.2.S1027

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References

• [1] O. Motojima et al., Nucl. Fusion 43, 1674 (2003).
• [2] K. Kawahata et al., Rev. Sci. Instrum.70, 707 (1999).
• [3] N. Ohyabu et al., Phys. Rev. Lett. 97, 055002 (2006).
• [4] K. Tanaka et al., Rev. Sci. Instrum. 75, 3429 (2004).
• [5] J. Irby et al., Rev. Sci. Instrum. 70, 699 (1999).
• [6] V.P. Drachev et al., Rev. Sci. Instrum. 64, 1010 (1993).
• [7] P.A. Bagryansky et al., Rev. Sci. Instrum. 77, 053501 (2006).
• [8] K. Nakayama et al., Elect. Eng. in Japan 153, 1 (2005).
• [9] K. Kawahata et al., Rev. Sci. Instrum. 75, 3508 (2004)
• [10] Y. Kawano et al., Rev. Sci. Instrum. 72, 1068 (2001).
• [11] T. Akiyama et al., Rev. Sci. Instrum. 74, 2695 (2003).
• [12] A.J.H. Donne et al., Rev. Sci. Instrum. 75, 4694 (2004).
• [13] T. Akiyama et al., Rev. Sci. Instrum. 77, 10F118 (2006).
• [14] Ch. Fuchs and H.J. Hartfuss, Phys. Rev. Let. 81, 1626 (1998).
• [15] K. Guenther et al., EFDA-JET-CP(04)03-21.
• [16] M.A. Nan Zeeland and T.N. Carlstrom, Rev. Sci. Instrum. 75, 3423 (2004).
• [17] T. Maekawa et al., Rev. Sci. Instrum. 62, 304 (1991).
• [18] Y. Jiang et al., Rev. Sci. Instrum. 68, 902 (1997).
• [19] D. Elbeze et al., Rev. Sci. Instrum. 75, 3405 (2004).

This paper may be cited as follows:

Kazuo KAWAHATA, Tsuyoshi AKIYAMA, Rostislav PAVLICHENKO, Kenji TANAKA, Yasuhiko ITO, Kazuya NAKAYAMA, Shigeki OKAJIMA and Shunji TSUJI-IIO, Plasma Fusion Res. 2, S1027 (2007).