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TY - UNPB AU - Hosokai, T. ED - Schaa, Volker RW ED - Arduini, Gianluigi ED - Pranke, Juliana ED - Seidel, Mike ED - Lindroos, Mats TI - Stable Electron Beams by Laser Wakefield Acceleration (LWFA) and the ImPACT Program in Japan J2 - Proc. of IPAC2017, Copenhagen, Denmark, 14â19 May, 2017 C1 - Copenhagen, Denmark T2 - International Particle Accelerator Conference T3 - 8 LA - english AB - A laser wakefield acceleration (LWFA) research that aims at table-top sized free-electron laser (FEL) under the ImPACT program in Japan will be reviewed. LWFA is expected to be a novel scheme for accelerating electron beams beyond GeV-class energy with compact devices. In recent studies, the pointing stability of the electron beams from LWFA has been dramatically improved by plasma-micro-optics (PMO) that is plasma device functioning as a focusing and optical-guiding tool for intense laser pulses. The PMO enables electron beams to be precisely controlled and/or transported by the beam-optics of conventional accelerators. With these techniques a staging LWFA has been demonstrated successfully, and high quality quasi-mono-energetic beams below the 100 MeV range are produced with good repeatability as an injector. Sub-GeV electron beams are also produced with a 4 mm-booster laser wakefield. These results will be presented and discussed. A future experimental site at SPRING-8/RIKEN is being prepared for the exclusive use of the laser-driven FEL. The plans towards a test area on the laser-driven FEL at SPRING-8 /RIKEN will be presented. PB - JACoW CP - Geneva, Switzerland ER -