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TY - CONF AU - Ayvazyan, V. AU - Ackermann, S. AU - Branlard, J. AU - Faatz, B. AU - Grecki, M.K. AU - Hensler, O. AU - Pfeiffer, S. AU - Piotrowski, A. AU - Schlarb, H. AU - Schmidt, Ch. AU - Scholz, M. AU - Schreiber, S. ED - Corvetti, Lou ED - Riches, Kathleen ED - Schaa, Volker RW TI - Low Level RF Control Implementation and Simultaneous Operation of Two FEL Undulator Beamlines at FLASH J2 - Proc. of ICALEPCS2015, Melbourne, Australia, 17-23 October 2015 C1 - Melbourne, Australia T2 - International Conference on Accelerator and Large Experimental Physics Control Systems T3 - 15 LA - english AB - The Free-Electron Laser in Hamburg (FLASH) is a user facility delivering femtosecond short radiation pulses in the wavelength range between 4.2 and 45 nm using the SASE principle. The tests performed in the last few years have shown that two FLASH undulator beamlines can deliver FEL radiation simultaneously to users with a large variety of parameters such as radiation wavelength, pulse duration, intra-bunch spacing etc. FLASH has two injector lasers on the cathode of the gun to deliver different bunch trains with different charges, needed for different bunch lengths. Because the compression settings depend on the charge of bunches the low level RF system needs to be able to supply different compression for both beamlines. The functionality of the controller has been extended to provide intra-pulse amplitude and phase changes while maintaining the RF field amplitude and the phase stability requirements. The RF parameter adjustment and tuning for RF gun and accelerating modules can be done independently for both laser systems. Having different amplitudes and phases within the RF pulse in several RF stations simultaneous lasing of both systems has been demonstrated. PB - JACoW CP - Geneva, Switzerland SP - 42 EP - 45 KW - operation KW - controls KW - LLRF KW - laser KW - undulator DA - 2015/12 PY - 2015 SN - 978-3-95450-148-9 DO - 10.18429/JACoW-ICALEPCS2015-MOC3O07 UR - http://jacow.org/icalepcs2015/papers/moc3o07.pdf ER -