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TY - CONF AU - Li, S. AU - Bohler, D.K. AU - Corbett, W.J. AU - Fiorito, R.B. AU - Fisher, A.S. AU - Gilevich, S. AU - Huang, Z. AU - Li, A. AU - Montgomery, E.J. AU - Ratner, D.F. AU - Robinson, J. AU - Zhang, H.D. AU - Zhou, F. ED - Henderson, Stuart ED - Akers, Evelyn ED - Satogata, Todd ED - Schaa, Volker R.W. TI - LCLS Injector Laser Modulation to Improve FEL Operation Efficiency and Performance J2 - Proc. of IPAC2015, Richmond, VA, USA, May 3-8, 2015 C1 - Richmond, VA, USA T2 - International Particle Accelerator Conference T3 - 6 LA - english AB - In the Linear Coherent Light Source (LCLS) at SLAC, the injector laser plays an important role as the source of the electron beam for the Free Electron Laser (FEL). The injector laser strikes a copper photocathode which emits photo-electrons due to photo-electric effect. The emittance of the electron beam is highly related to the transverse shape of the injector laser. Currently the LCLS injector laser has hot spots that degrade the FEL performance. The goal of this project is to use adaptive optics to modulate the transverse shape of the injector laser, in order to produce a desired shape of electron beam. With a more controllable electron transverse profile, we can achieve lower emittance for the FEL, improve the FEL performance and operation reliability. We first present various options for adaptive optics and damage test results. Then we will discuss the shaping process with an iterative algorithm to achieve the desired shape, characterized by Zernike polynomial deconstruction. PB - JACoW CP - Geneva, Switzerland SP - 1813 EP - 1815 KW - laser KW - electron KW - optics KW - FEL KW - emittance DA - 2015/06 PY - 2015 SN - 978-3-95450-168-7 DO - 10.18429/JACoW-IPAC2015-TUPJE074 UR - http://jacow.org/ipac2015/papers/tupje074.pdf ER -