[17p-A501-1~12] 3.5 超高速・高強度レーザー（旧3.6）

▲ [17p-A501-7] BISER experiments with the Astra and J-KAREN-P lasers

〇Alexander Pirozhkov¹、A.N. Shatokhin²、A. Sagisaka¹、K. Ogura¹、T.A. Pikuz³、A.V. Kotov⁴、T. Dzelzainis⁵、A. Bierwage¹、Ko. Kondo¹、H. Ohiro⁶、S. Lorenz⁷、Y.-K. Liu⁸、G.M. Grittani⁷、T.M. Jeong⁷、N. Nakanii¹、K. Huang¹、A. Kon¹、Y. Miyasaka¹、G. Hull⁵、S. Dann⁵、E.A. Vishnyakov⁷、A.O. Kolesnikov²、M. Koike¹、P. Chen⁸、T.Zh. Esirkepov¹、J.K. Koga¹、R. Gray⁹、A.A. Soloviev⁴、E.N. Ragozin²、S.V. Bulanov⁷ (1.QST、2.LPI RAS、3.Osaka Univ.、4.IAP RAS、5.CLF RAL、6.Hiroshima Univ.、7.ELI Beamlines、8.Nat. Taiwan Univ.、9.Strathclyde Univ.)

キーワード：Ultrabright coherent x-ray source, Relativistic laser plasma, Burst Intensification by Singularity Emitting Radiation (BISER)

BISER is an ultrabright temporally&spatially coherent x-ray source. We performed BISER experiments with the Astra and J-KAREN-P lasers.
As reported earlier, in the 7 TW Astra experiment we obtained unusually bright ~μJ pulses (17-34nm range, 0.3°×0.2° acceptance angle). Understanding bright coherent x-ray generation physics is an outstanding scientific problem. Here we report on our efforts to perform time-resolved diagnostics of relativistic plasma singularities.
Another outstanding task is to measure the total BISER pulse energy, for which we need to know its near-axis angular distribution. This requires placing x-ray diagnostics close to the interaction point. The challenge is to avoid x-ray filter damage and multi-TW laser focusing onto an x-ray CCD. In the J-KAREN-P experiment, we performed filter damage threshold studies, followed by the damage-free BISER angular distribution measurements in the ±2.5° cone. It showed that under optimum conditions BISER had ~100μJ pulses.