IBIC2014 - List of Authors (Pfeiffer, S.)

Paper	Title	Page
MOCZB3	Comparison of Feedback Controller for Link Stabilizing Units of the Laser Based Synchronisation System used at the European XFEL	34
	M. Heuer, S. Pfeiffer, H. Schlarb DESY, Hamburg, Germany G. Lichtenberg HAW, Hamburg, Germany
	The European X-ray Free Electron Laser will allow scientists to perform experiments with an atomic scale resolution. To perform time resolved experiments at the end of the facility it is essential to provide a highly stable clock signal to all subsystems. The accuracy of this signal is extremely important since it defines limitations of precise measurement devices. A laser based synchronization system is used for the synchronization with an error in sub-femtosecond range. These light pulses are carried by an optical fiber and exposed to external disturbances which changes the optical length of the fiber. For that reason the up to 4 kilometer long fibers are actively stabilized using a controller implemented on the new MicroTCA Platform. Due to the high computation resources of this platform it is possible to attack the time delay of the link system with well known model based feedback control strategies. This contribution shows the design of a model based controller for such a system and compares the control performance of the previously used PID controller with advanced control algorithms at the currently installed laboratory setup.
	Slides MOCZB3 [4.973 MB]
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MOPF22	Simultaneous Operation of Two FEL Undulator Beamlines at FLASH	103
	S. Ackermann, V. Ayvazyan, B. Faatz, E. Hass, K. Klose, S. Pfeiffer, M. Scholz, S. Schreiber DESY, Hamburg, Germany
	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. S. Ackermann for the FLASH II Team
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Paper

Title

Page

Comparison of Feedback Controller for Link Stabilizing Units of the Laser Based Synchronisation System used at the European XFEL

34

M. Heuer, S. Pfeiffer, H. Schlarb
DESY, Hamburg, Germany
G. Lichtenberg
HAW, Hamburg, Germany

The European X-ray Free Electron Laser will allow scientists to perform experiments with an atomic scale resolution. To perform time resolved experiments at the end of the facility it is essential to provide a highly stable clock signal to all subsystems. The accuracy of this signal is extremely important since it defines limitations of precise measurement devices. A laser based synchronization system is used for the synchronization with an error in sub-femtosecond range. These light pulses are carried by an optical fiber and exposed to external disturbances which changes the optical length of the fiber. For that reason the up to 4 kilometer long fibers are actively stabilized using a controller implemented on the new MicroTCA Platform. Due to the high computation resources of this platform it is possible to attack the time delay of the link system with well known model based feedback control strategies. This contribution shows the design of a model based controller for such a system and compares the control performance of the previously used PID controller with advanced control algorithms at the currently installed laboratory setup.

Slides MOCZB3 [4.973 MB]

Export •

reference for this paper to ※ LaTeX, ※ Text, ※ IS/RefMan, ※ EndNote (xml)

MOPF22

Simultaneous Operation of Two FEL Undulator Beamlines at FLASH

103

S. Ackermann, V. Ayvazyan, B. Faatz, E. Hass, K. Klose, S. Pfeiffer, M. Scholz, S. Schreiber
DESY, Hamburg, Germany

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.
S. Ackermann for the FLASH II Team

Export •

reference for this paper to ※ LaTeX, ※ Text, ※ IS/RefMan, ※ EndNote (xml)