[Table of Contents]

Plasma and Fusion Research

Volume 2, S1044 (2007)

Regular Articles

Laser Absorption Spectroscopy for Diagnostics of a Neutral Helium Beam
Atsushi OKAMOTO, Katsuhiro SHINTO, Sumio KITAJIMA and Mamiko SASAO
Tohoku University, Sendai, Miyagi 980-8579, Japan
(Received 4 December 2006 / Accepted 1 May 2007 / Published 20 November 2007)

Abstract

The density resolution of a measurement system using laser absorption spectroscopy is evaluated in order to diagnose a fraction of metastable helium atoms (2 3S1) in a neutral helium beam. Experiments performed in a hollow cathode device show that the density resolution of the present system is about 5 × 1013 m-3 for a 1 m absorption length. Optimization of absorption scheme and improvements of signal detection are suggested, which shows that laser absorption spectroscopy is a promising diagnostic method for a neutral helium beam.

Keywords

laser absorption spectroscopy, neutral beam, helium atom, metastable state, hollow cathode discharge

DOI: 10.1585/pfr.2.S1044

Full Text

PDF format (168Kbytes) PDF Download

References

  • [1] D.E. Post, D.R. Mikkelsen, R.A. Hulse, L.D. Stewart and J.C. Weisheit, J. Fusion Energy 1, 129 (1981).
  • [2] M. Sasao and K.N. Sato, Fusion Technol. 10, 236 (1986).
  • [3] M. Sasao, A. Taniike, I. Nomura, M. Wada, H. Yamaoka and M. Sato, Nucl. Fusion 35, 1619 (1995).
  • [4] K. Shinto, A. Okamoto, S. Kitajima, M. Sasao, M. Nishiura, O. Kaneko, S. Kiyama, H. Sakakita, Y. Hirano and M. Wada, In Proceedings of EPAC 2006, Edinburgh, Scotland (2006) p.1726.
  • [5] M. Sasao, K. Shinto, M. Isobe, M. Nishiura, O. Kaneko, M. Wada, C.I. Walker, S. Kitajima, A. Okamoto, H. Sugawara, S. Takeuchi, N. Tanaka, H. Aoyama and M. Kisaki, Rev. Sci. Instrum. 77, 10F130 (2006).
  • [6] E.B. Hooper, Jr., P.A. Pincosy, P. Poulsen, C.F. Burrell, L.R. Grisham and D.E. Post, Rev. Sci. Instrum. 51, 1066 (1980).
  • [7] M. Sasao, A. Taniike, M. Nishiura and M. Wada, Rev. Sci. Instrum. 69, 1063 (1998).
  • [8] K. Shinto, H. Sugawara, S. Takeuchi, S. Kitajima, M. Takenaga, M. Sasao, M. Nishiura, O. Kaneko, S. Kiyama and M. Wada, In Proceedings of 2005 Particle Accelerator Conference, Knoxville, Tennessee (2005) p.2630.
  • [9] N. Tanaka, H. Sugawara, S. Takeuchi, S. Asakawa, A. Okamoto, K. Shinto, S. Kitajima, M. Sasao and M. Wada, to be appeared in Plasma Fusion Res. (2007).
  • [10] M.W. Millard, P.P. Yaney, B.N. Ganguly and C.A. DeJoseph Jr., Plasma Sources Sci. Technol. 7, 389 (1998).
  • [11] M. Aramaki, Y. Okumura, M. Goto, S. Muto, S. Morita and K. Sasaki, Jpn. J. Appl. Phys. 44, 6759 (2005).
  • [12] NIST Atomic Spectra Database (http://physics.nist.gov/PhysRefData/ASD/index.html).
  • [13] A. Okamoto, T. Kobuchi, S. Kitajima and M. Sasao, Plasma Fusion Res. 2, 029 (2007).

This paper may be cited as follows:

Atsushi OKAMOTO, Katsuhiro SHINTO, Sumio KITAJIMA and Mamiko SASAO, Plasma Fusion Res. 2, S1044 (2007).