@misc{oai:repo.qst.go.jp:00079537, author = {Pirozhkov, Alexander and Timur, Esirkepov and Gonzalez izquierdo, Bruno and Sagisaka, Akito and A. Pikuz, T. and E. Davidson, Z. and Ogura, Koichi and Bierwage, Andreas and HUANG, KAI and Nakanii, Nobuhiko and Kevin Koga, James and Ya. Lopatin, A. and Fukuda, Yuuji and Neely, D. and McKenna, P. and N. Ragozin, E. and A. Pikuz, S. and I. Chkhalo, N. and N. Salashchenko, N. and Namba, Shinichi and Kiriyama, Hiromitsu and Koike, Masato and Kondo, Kiminori and Kawachi, Tetsuya and Kando, Masaki and Pirozhkov, Alexander and Timur, Esirkepov and Gonzalez izquierdo, Bruno and Sagisaka, Akito and Ogura, Koichi and Bierwage, Andreas and HUANG, KAI and Nakanii, Nobuhiko and Kevin Koga, James and Fukuda, Yuuji and Namba, Shinichi and Kiriyama, Hiromitsu and Koike, Masato and Kondo, Kiminori and Kawachi, Tetsuya and Kando, Masaki}, month = {Sep}, note = {Burst Intensification by Singularity Emitting Radiation (BISER) is a new mechanism of bright coherent x-ray generation employing high-power femtosecond lasers to drive singularities of multi-stream relativistic plasma flows. We have recently demonstrated that the BISER source can be controlled and stabilized with a tailored plasma density profile (density jump), which is created with a blade inserted into the supersonic gas flow. In this presentation we report on new experimental results obtained with the upgraded J-KAREN-P laser. In particular, we extended the BISER emission up to keV photon energies, and increased the BISER yield in the 60 to 100 eV spectral range up to ~ 1 uJ (10^11 photons) per pulse into the detector acceptance angle of 10^-2 sr., The 11th International Conference of Inertial Fusion Sciences and Applications (IFSA-2019)}, title = {Reaching the keV spectral range with BISER control}, year = {2019} }