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Journal Articles

Development of laser-driven quasi-monoenergetic proton beam line for radiobiology

Yogo, Akifumi; Maeda, Takuya; Hori, Toshihiko; Sakaki, Hironao; Ogura, Koichi; Nishiuchi, Mamiko; Sagisaka, Akito; Bolton, P.; Murakami, Masao*; Kawanishi, Shunichi; et al.

Nuclear Instruments and Methods in Physics Research A, 653(1), p.189 - 192, 2011/10

 Times Cited Count:9 Percentile:58.76(Instruments & Instrumentation)

Oral presentation

Novel X-ray generation schemes based on electron cusps formed via intense laser plasma interaction

Kando, Masaki; Pirozhkov, A. S.; Esirkepov, T. Z.; Kawase, Keigo*; Ragozin, E. N.*; Faenov, A. Ya.*; Pikuz, T.*; Fukuda, Yuji; Sagisaka, Akito; Mori, Michiaki; et al.

no journal, , 

We present the results of two kinds of experiments and theoretical description for generating coherent, ultrashort, tunable X-ray photons. Nonlinear interaction of intense laser pulses with plasma creates stable, specific structures such as electron cusps. For example, wake waves excited in an unerdense plasma by intense, short-pulse laser becomes dense and propagate along the laser pulse. These wake waves act as relativistic flying mirrors. The flying mirror can reflect a counter-propagating laser pulse and directly convert it into high-frequency radiation, with a frequency multiplication factor $$sim$$ 4$$gamma^2$$ and a pulse shortening with the same factor. We present the results of experiments. Another mechanism of coherent X-ray generation is based on a single laser pulse irradiating gas jet target. In this case, bright high-order harmonics of both odd and even orders are emitted in the forward direction. We attribute this to the synchrotron or nonlinear Thomson scattering of a bunch of electrons in the cusp interacting with the laser.

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