Pirozhkov, A. S. and Kando, M. and Esirkepov, T. Zh and Gallegos, P. and Ahmed, H. and Ragozin, E. N. and Faenov, A. Ya and Pikuz, T. A. and Kawachi, T. and Sagisaka, A. and Koga, J. K. and Coury, M. and Green, J. and Foster, P. and Brenner, C. and Dromey, B. and Symes, D. R. and Mori, M. and Kawase, K. and Kameshima, T. and Fukuda, Y. and Chen, L. and Daito, I. and Ogura, K. and Hayashi, Y. and Kotaki, H. and Kiriyama, H. and Okada, H. and Nishimori, N. and Imazono, T. and Kondo, K. and Kimura, T. and Tajima, T. and Daido, H. and Rajeev, P. and McKenna, P. and Borghesi, M. and Neely, D. and Kato, Y. and Bulanov, S. V. (2012) Soft-x-ray harmonic comb from relativistic electron spikes. Physical Review Letters, 108 (13). -. ISSN 0031-9007Full text not available in this repository. (Request a copy from the Strathclyde author)
We demonstrate a new high-order harmonic generation mechanism reaching the "water window" spectral region in experiments with multiterawatt femtosecond lasers irradiating gas jets. A few hundred harmonic orders are resolved, giving mu J/sr pulses. Harmonics are collectively emitted by an oscillating electron spike formed at the joint of the boundaries of a cavity and bow wave created by a relativistically self-focusing laser in underdense plasma. The spike sharpness and stability are explained by catastrophe theory. The mechanism is corroborated by particle-in-cell simulations.
|Keywords:||x-ray harmonic comb , harmonic comb , relativistic electron spikes , electron spikes, Plasma physics. Ionized gases, Physics and Astronomy(all)|
|Subjects:||Science > Physics > Plasma physics. Ionized gases|
|Department:||Faculty of Science > Physics|
|Depositing user:||Pure Administrator|
|Date Deposited:||06 Jun 2012 13:23|
|Last modified:||02 Sep 2016 02:56|