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TY - CONF AU - Park, Y. AU - Agustsson, R.B. AU - Campese, T.J. AU - Dang, D.K. AU - Denham, P.E. AU - Gadjev, I.I. AU - Hall, C.C. AU - Murokh, A.Y. AU - Musumeci, P. AU - Sudar, N.S. AU - Sun, Y. AU - Webb, S.D. AU - Zholents, A. ED - Schaa, Volker R.W. ED - Decking, Winfried ED - Sinn, Harald ED - Geloni, Gianluca ED - Schreiber, Siegfried ED - Marx, Michaela TI - Status Update for the High Gain High Efficiency TESSA-266 Experiment J2 - Proc. of FEL2019, Hamburg, Germany, 26-30 August 2019 CY - Hamburg, Germany T2 - Free Electron Laser Conference T3 - 39 LA - english AB - Tapering Enhanced Stimulated Superradiant Amplification (TESSA) allows to increase the efficiency of Free Electron Laser (FEL) based radiation generation from ~0.1% to 10% by using intense seed laser pulses, strongly tapered undulators and prebunched electron beams . Initial results validating this method have already been obtained at 10 µm wavelength at Brookhaven National Laboratory . We will present the design of an experiment to demonstrate the TESSA scheme at high gain and shorter wavelength (266 nm) using the APS injector linac at Argonne National Labor-atory (ANL) to obtain conversion efficiency of up to 10%. Undulator and focusing lattice design, as well as beam dynamics and diagnostics for this experiment will be discussed. An extension of the experiment to include the possibility of multi-bunch linac operation and an optical cavity around the undulator to operate in the TESSO regime will also be presented . PB - JACoW Publishing CP - Geneva, Switzerland SP - 730 EP - 733 KW - undulator KW - quadrupole KW - laser KW - electron KW - experiment DA - 2019/11 PY - 2019 SN - 978-3-95450-210-3 DO - doi:10.18429/JACoW-FEL2019-THP073 UR - http://jacow.org/fel2019/papers/thp073.pdf ER -