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TY - UNPB AU - Wu, Y.P. AU - Cheng, Z. AU - Du, Y. C. AU - Hua, J.F. AU - Lu, W. AU - Pai, C.H. AU - Zhang, J. AU - Zhou, S.Y. AU - Zhou, Z. ED - Schaa, Volker RW ED - Ji, Daheng ED - Li, Lu ED - Zhao, Ning TI - Experimental Observation of External Injection Acceleration by a Laser Produced Wake using a RF Photogun Based Linac J2 - Proc. of SAP2017, Jishou, China, 28-30 August 2017 C1 - Jishou, China T2 - Symposium on Accelerator Physics T3 - 13 LA - english AB - External injection of beams into plasma accelerators and acceleration with minimal degradation of their quality provide a promising route to make plasma acceleration a realistic technology for applications. In the past two years, we have carried out a lot of preparatory work for the external injection acceleration experiment in Tsinghua University. An ultrafast TW Ti:sapphire laser system is synchronized with a 45 MeV RF photogun based linac with a sub-200fs (RMS) time jitter between the laser pulse and the electron bunch. Here we present the first-time observation of external injection acceleration by a laser produced linear wake. Stable 32-MeV, 1~2-pC electron beams from the linac were compressed by a Chicane, focused to a 200-um radius (RMS) and then injected into the linear wakefield excited by the 10TW, 30fs laser. The preliminary experimental results show that up to 20% electrons can be accelerated and the maximum energy gain reaches 0.35 MeV in a 6-mm long plasma by optimizing the plasma density and the laser focal plane position with respect to the plasma, corresponding to an average gradient of about 60 MV/m, which are in reasonable agreement with 3D PIC simulations. PB - JACoW CP - Geneva, Switzerland ER -