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TY - CONF AU - Faatz, B. AU - Tischer, M. AU - Vagin, P. ED - Schaa, Volker R.W. ED - Decking, Winfried ED - Sinn, Harald ED - Geloni, Gianluca ED - Schreiber, Siegfried ED - Marx, Michaela TI - Influence of Radiation Exposure on the FEL Performance at FLASH J2 - Proc. of FEL2019, Hamburg, Germany, 26-30 August 2019 CY - Hamburg, Germany T2 - Free Electron Laser Conference T3 - 39 LA - english AB - FLASH has been operated as user facility for about 14 years. In this time, the total charge accelerated and transported through the FLASH1 undulator is around 35 Coulomb. Based on detailed monitoring of the radiation loss and reference measurements on degradation of the magnetic field of the undulator, we have performed simulations to study the change in FEL performance and first comparison of the simulations with the changes we observe during operation. PB - JACoW Publishing CP - Geneva, Switzerland SP - 488 EP - 491 KW - undulator KW - FEL KW - radiation KW - simulation KW - operation DA - 2019/11 PY - 2019 SN - "" SN - 978-3-95450-210-3 DO - doi:10.18429/JACoW-FEL2019-WEP070 UR - http://jacow.org/fel2019/papers/wep070.pdf ER -