[Table of Contents]

Plasma and Fusion Research

Volume 2, S1058 (2007)

Regular Articles

Measurements of Oxygen Ion Spectra for Estimation of Electric Field Profiles in Cylindrical Plasmas
Takayuki KOBAYASHI, Masayuki YOSHIKAWA, Yuusuke KUBOTA, Ken MATAMA, Masamitsu NOTO, Junichi YOKOSHIMA and Teruji CHO
Plasma Research Center, University of Tsukuba, Tsukuba 305-8577, Japan
(Received 4 December 2006 / Accepted 20 March 2007 / Published 20 November 2007)

Abstract

Electric field profiles play an important role in the improvement of plasma confinement. It is essential to develop techniques to measure the electric field profiles in each region of a fusion device. We have developed a technique to measure the electric field profiles in cylindrical plasmas by measuring the Doppler shift of the CII spectrum. Recently, we have developed a collisional-radiative model for the lower charge state of oxygen ions. The oxygen emissions are stronger than those of carbon in GAMMA 10. In order to achieve a higher resolution for the electric field measurements, the technique for measuring the electric field profiles was improved by using the measurements of the oxygen spectra and the calculation of the newly developed collisional-radiative model. The electric field profile was successfully obtained under the condition of a weak electric field.

Keywords

electric field profile, spectroscopy, collisional-radiative model, cylindrical plasma, GAMMA 10

DOI: 10.1585/pfr.2.S1058

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References

  • [1] J.W. Connor et al., Plasma Phys. Control. Fusion 42, R1 (2000).
  • [2] P.H. Diamond et al., Plasma Phys. Control. Fusion 47, R35 (2005).
  • [3] T. Cho et al., Phys. Rev. Lett. 94, 085002 (2005).
  • [4] T. Cho et al., Phys. Rev. Lett. 97, 055001 (2006).
  • [5] T. Kobayashi et al., Rev. Sci. Instrum. 75, 4121 (2004).
  • [6] M. Yoshikawa et al., Trans. Fusion Technol. 39, 289 (2001).
  • [7] T. Kato et al., Fusion Eng. Des. 34-35, 789 (1997).
  • [8] M. Yoshikawa et al., J. Plasma Fusion Res. SERIES 6, 685 (2004).
  • [9] T. Kobayashi et al., Proc. of 33rd EPS, Conference on Plasma Physics (2006).
  • [10] T. Kobayashi et al., Trans. Fusion Technol. 51, 256 (2007).

This paper may be cited as follows:

Takayuki KOBAYASHI, Masayuki YOSHIKAWA, Yuusuke KUBOTA, Ken MATAMA, Masamitsu NOTO, Junichi YOKOSHIMA and Teruji CHO, Plasma Fusion Res. 2, S1058 (2007).