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TY - CONF AU - Loisch, G. AU - Boonpornprasert, P. AU - Brinkmann, R. AU - Good, J.D. AU - Groß, M. AU - Grüner, F.J. AU - Huck, H. AU - Krasilnikov, M. AU - Lishilin, O. AU - Martinez de la Ossa, A. AU - Oppelt, A. AU - Osterhoff, J. AU - Renier, Y. AU - Stephan, F. ED - Koscielniak, Shane ED - Satogata, Todd ED - Schaa, Volker RW ED - Thomson, Jana TI - Optimisation of High Transformer Ratio Plasma Wakefield Acceleration at PITZ J2 - Proc. of IPAC2018, Vancouver, BC, Canada, April 29-May 4, 2018 C1 - Vancouver, BC, Canada T2 - International Particle Accelerator Conference T3 - 9 LA - english AB - The transformer ratio, the ratio between maximum accelerating field and maximum decelerating field in the driving bunch of a plasma wakefield accelerator (PWFA), is one of the key aspects of this acceleration scheme. It not only defines the maximum possible energy gain of the PWFA but it is also connected to the maximum percentage of energy that can be extracted from the driver, which is a limiting factor for the efficiency of the accelerator. Since in linear wakefield theory a transformer ratio of 2 cannot be exceeded with symmetrical drive bunches, any ratio above 2 is considered high. After the first demonstration of high transformer ratio acceleration in a plasma wakefield at PITZ, the photoinjector test facility at DESY, Zeuthen site, limiting aspects of the transformer ratio are under investigation. This includes e.g. the occurrence of bunch instabilities, like the transverse two stream instability, or deviations of the experimentally achieved bunch shapes from the ideal. PB - JACoW Publishing CP - Geneva, Switzerland SP - 1648 EP - 1650 KW - plasma KW - wakefield KW - acceleration KW - laser KW - electron DA - 2018/06 PY - 2018 SN - 978-3-95450-184-7 DO - 10.18429/JACoW-IPAC2018-TUPML047 UR - http://jacow.org/ipac2018/papers/tupml047.pdf ER -