TY - CPAPER AU - Ackermann, S. AU - Ayvazyan, V. AU - Faatz, B. AU - Hass, E. AU - Klose, K. AU - Pfeiffer, S. AU - Scholz, M. AU - Schreiber, S. TI - Simultaneous Operation of Two FEL Undulator Beamlines at FLASH J2 - Proc. of IBIC2014 AB - The FLASH FEL User Facility at DESY (Hamburg) is driven by a Photocathode RF gun and superconducting RF structures, producing up to 800 electron bunches per train with a repetition rate of 10 Hz. Because not all user experiments need the full pulse train (8000 FEL pulses per second), part of the electron bunches can be deflected into a second beamline, which can simultaneously deliver FEL pulses with different parameters to a second user experiment. To realize this possibility, the FLASH facility has been upgraded with a second undulator line and a second experimental Hall. In this contribution, we will present the new layout of the FLASH facility and the first results to operate it with different parameter sets. We will show present results achieved during the commissioning of the new beamline. Finally, we will give an outlook of further commissioning plans and user operation. PB - JACoW CY - Geneva, Switzerland SP - 103 EP - 105 KW - undulator KW - laser KW - FEL KW - electron KW - operation DA - 2014/10 PY - 2014 SN - 978-3-95450-141-0 UR - http://jacow.org/IBIC2014/papers/mopf22.pdf ER -