Generation of high-flux soft X-ray high harmonics driven by loosely focused TW-class infrared pulses Kotaro Nishimura, Yuxi Fu, Akira Suda, Katsumi Midorikawa and J. Takahashi Eiji EPJ Web Conf., 205 (2019) 02012 Published online: 16 April 2019 DOI: 10.1051/epjconf/201920502012