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(IFP/01) High Rep-Rate KrF Laser Development and Intense Pulse Interaction Experiments for IFE

Y. Owadano¹⁾, E. Takahashi¹⁾, I. Okuda¹⁾, I. Matsushima¹⁾, Y. Matsumoto¹⁾, S. Kato¹⁾, K. Kuwahara²⁾, E. Miura¹⁾, H. Yashiro^1)
 
1) Electrotechnical Laboratory, Tsukuba, Ibaraki, Japan
²⁾ Science University of Tokyo, Noda, Chiba, Japan

Abstract.  A high repetition-rate e-beam pumped Krypton fluoride (KrF) laser has been developed as a prototype of future IFE driver. A combination of power supply with high voltage magnetic switches and e-beam diode cooled by water and self heat-radiation is generating e-beam at 0.5 Hz. Laser oscillation at 1 Hz with output energy over 20 J is expected in near future. Intense short pulse ( > 10J, $\sim$ 3ps) has been generated by using a SBS (stimulated Brillouin scattering) short pulse generator and one of the Super-ASHURA's beam line. Interaction experiments with a power density $\sim$ 10¹⁸W/cm² were performed with long scale-length plasma produced by 20 ns pulse. X-ray images show that the short pulse reached to the point close to the original target surface.

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