[Table of Contents]

Plasma and Fusion Research

Volume 2, 013 (2007)

Regular Articles

X-Ray Polarization Spectroscopy of Heα Line Emission for Diagnosis of the Anisotropy of Hot Electrons
Yuichi INUBUSHI, Takeshi KAI, Tohru KAWAMURA1), Shinsuke FUJIOKA, Hiroaki NISHIMURA and Kunioki MIMA
Institute of Laser Engineering, Osaka University
1)
Tokyo Institute of Technology, Interdisciplinary Graduate School of Science and Engineering
(Received 6 December 2006 / Accepted 22 March 2007 / Published 10 May 2007)

Abstract

X-ray polarization spectroscopy is proposed as an advanced diagnostic tool to measure the anisotropic velocity distribution of hot electrons generated by an ultra-high intensity laser pulse. The relationship between the anisotropy of the hot electron velocity distribution and the polarization degree was investigated for various tracer materials. It is shown that the polarization degrees of Heα lines are a function of electron energy normalized by the excitation threshold. Depolarization is caused by isotropic bulk electrons in high temperature plasma. To diagnose the anisotropy of the hot electron velocity distribution without depolarization, it is essential to select a tracer material whose energy of Heα line is 10 times higher than the bulk electron temperature.

Keywords

laser-produced plasma, polarization spectroscopy, hot electron, velocity distribution function, energy transport

DOI: 10.1585/pfr.2.013

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References

  • [1] M. Tabak, J. Hammer, M.E. Glinsky, W.L. Kruer, S.C. Wilks, J. Woodworth, E.M. Cambell, M.D. Perry and R.J. Mason, Phys. Plasmas 1, 1624 (1994).
  • [2] R. Kodama, H. Shiraga, K. Shigemori, Y. Tohyama, S. Fujioka, H. Azechi, H. Fujita, H. Habara, T. Hall, Y. Izawa, T. Jitsuno, Y. Kitagawa, K.M. Krushelnick, K.L. Lancaster, K. Mima, K. Nagai, M. Nakai, H. Nishimura, T. Norimatsu, P.A. Norreys, S. Sakabe, K.A. Tanaka, A. Youssef, M. Zept and T. Yamanaka, Nature 418, 933 (2002).
  • [3] T. Tajima and J.M. Dawson, Phys. Rev. Lett. 43, 267 (1979).
  • [4] S.P.D. Mangles, C.D. Murphy, Z. Najmudin, A.G.R. Thomas, J.L. Collier, A.E. Dangor, E.J. Divall, P.S. Foster, J.G. Gallacher, C.J. Hooker, D.A. Jaroszynski, A.J. Langley, W.B. Mori, P.A. Norreys, F.S. Tsung, R. Viskup, B.R. Waltonand and K. Krushelnick, Nature 431, 535 (2004).
  • [5] C.G.R. Geddes, C.S. Toth, J. Van Tilborg, E. Esarey, C.B. Schroeder, D. Bruhwiler, C. Nieter, J. Cary and W.P. Leemans, Nature 431, 538 (2004).
  • [6] J. Faure, Y. Glinec, A. Pukhov, S. Kiselev, S. Gordienko, E. Lefebvre, J.P. Rousseau, F. Burgy and V. Malka, Nature 431, 541 (2004).
  • [7] A. Rousse, C. Rischel, S. Fourmaux, I. Uschmann, S. Sebban, G. Grillon, Ph. Balcou, E. Forster, J.P. Geindre, P. Audebert, J.C. Gautheir and D. Hulin, Nature 410, 65 (2001).
  • [8] S.C. Wilks and W.L. Kruer, IEEE J. Quantum Electron 33, 1954 (1997), and references therein.
  • [9] Y. Sentoku, K. Mima, P. Kaw and K. Nishikawa, Phys. Rev. Lett. 90, 155001 (2003).
  • [10] P.A. Norreys, K.L. Lancaster, C.D. Murphy, H. Habara, S. Karsch, R.J. Clarke, J. Collier, R. Heathcote, C. Hemandes-Gomez, S. Hawkes, D. Neely, M.H.R. Hutchinson, R.G. Evans, M. Borghesi, L. Romagnani, M. Zepf, K. Akli, J.A. King, B. Zhang, R.R. Freeman, A.J. Mackinnon, S.P. Hatchett, P. Patel, R. Snavely, M.H. Key, A. Nikroo, R. Stephens, C. Stoeckl, K.A. Tanaka, T. Norimatsu, Y. Toyama and R. Kodama, Phys. Plasmas 11, 2746 (2004).
  • [11] M. Lombardi and J.C. Pebay-peyroula, C.R. Acad. Sc. Paris 261, 1485 (1965).
  • [12] Kh. Kallas and M. Chaika, Opt. Spectrosc. 27, 376 (1969).
  • [13] C.G. Carrington and A. Corney, Opt. Commun. 1, 115(1969).
  • [14] J.C. Kieffer, J.P. Matte, H. Pepin, M. Chaker, Y. Beaudoin, T.W. Johnston, C.Y. Chien, S. Coe, G. Mourou and J. Dubau, Phys. Rev. Lett. 68, 480 (1992).
  • [15] J.C. Kieffer, J.P. Matte, H. Pepin, M. Chaker, Y. Beaudoin, C.Y. Chien, S. Coe, G. Mourou, J. Dubau and M.K. Inal, Phys. Rev. E 48, 4648 (1993).
  • [16] P. Beiersdorfer and M. Slater, Phys. Rev. E 64, 066408 (2001).
  • [17] H. Yoneda, N. Hasegawa, S. Kawana and K. Ueda, Phys. Rev. E 56, 988 (1997).
  • [18] Y. Inubushi, H. Nishimura, M. Ochiai, S. Fujioka, Y. Izawa, T. Kawamura, S. Shimizu, M. Hashida and S. Sakabe, Rev. Sci. Instrum. 75, 3699 (2004).
  • [19] Y. Inubushi, H. Nishimura, M. Ochiai, S. Fujioka, T. Johzaki, K. Mima, T. Kawamura, S. Nakazaki, T. Kai, S. Sakabe and Y. Izawa, J. Quant. Spectrosc. Radiat. Transf. 99, 305 (2006); Erratum, 101 191 (2006).
  • [20] I.C. Percival and M.J. Seaton, Philos. Trans. R. Soc. London, Ser. A 251, 113 (1958).
  • [21] T. Kai, S. Nakazaki and K.A. Berrington, Nucl. Instum. Methods Phys. Res. B 235, 249 (2005).
  • [22] K.J. Reed and M.H. Chen, Phys. Rev. A 48, 3644 (1993).
  • [23] K.A. Berrington, W.B. Eissner and P.H. Norrington, Comput. Phys. Commum. 92, 290 (1995).
  • [24] H. Feshbach, Ann. Phys. (N. Y.) 5, 357 (1958).
  • [25] T. Kai, S. Nakazaki, T. Kawamura, H. Nishimura and K. Mima, Phys. Rev. A 75, 012703 (2007).

This paper may be cited as follows:

Yuichi INUBUSHI, Takeshi KAI, Tohru KAWAMURA, Shinsuke FUJIOKA, Hiroaki NISHIMURA and Kunioki MIMA, Plasma Fusion Res. 2, 013 (2007).