*Mamiko Nishiuchi¹, Chang Liu¹, Nicholas Peter Dover², Hironao Sakaki^1,3, Akira Kon¹, Kotaro Kondo¹, Hiromitsu Kiriyama¹, Masayasu Kevin Hata¹, James Koga¹, Tatsuhiko Miyatake^1,3, Emma-Jane Ditter², George Hicks², Nuo Xu², Ginevra Casati², Zulfikar Najmudin², Tim Elias Ziegler⁴, Marvin Umlandt⁴, Milenko Vescovi-Pinochet⁴, Ulrich Schramm⁴, Zeil Karl⁴, Natsumi Iwata⁵, Yasuhiko Sentoku⁵(1. National Institutes for Quantum Science and Technology (QST) Kansai Photon Science Institute, 2. John Adams Institute for Accelerator Science, Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom, 3. Interdisciplinary Graduate School of Engineering Sciences, Kyushu University, Kasuga, Fukuoka 816-8580, Japan, 4. Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden, Germany, 5. Institutes of Laser Enginieering, Osaka-Universiy, 2-6 Yamadaoka, Suita, Osaka, Japan)