IBIC2014 - List of Authors (Schlarb, H.)

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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MOPD07	New MTCA.4-based Hardware Developments for the Control of the Optical Synchronization Systems at DESY	152
	M. Felber, M.K. Czwalinna, H.T. Duhme, M. Fenner, C. Gerth, M. Heuer, T. Lamb, U. Mavrič, J.M. Mueller, P. Peier, H. Schlarb, S. Schulz, B. Steffen, C. Sydlo, M. Titberidze, T. Walter, R. Wedel, F. Zummack DESY, Hamburg, Germany E. Janas Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland T. Kozak, P. Prędki, K.P. Przygoda TUL-DMCS, Łódź, Poland J. Szewiński NCBJ, Świerk/Otwock, Poland
	Funding: This work has partly been funded by the Helmholtz Validation Fund Project MTCA.4 for Industry (HVF-0016) The optical synchronization group at DESY is operating and continuously enhancing their laser-based synchronization systems for various facilities which need femtosecond-stable timing. These include the free-electron lasers FLASH and the upcoming European XFEL as well as the electron diffraction machine REGAE and the plasma acceleration test facilities. One of the major upgrades under development is the migration of the entire electronic control hardware to the new MTCA.4 platform which was introduced as the new standard for accelerator control in many facilities worldwide. In this paper we present the applied modules and the topology of the new systems. Main advantages are a compact design with higher performance, redundancy, and remote management.
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MOPD12	Novel Femtosecond Level Synchronization of Titanium Sapphire Laser and Relativistic Electron Beams	174
	M. Titberidze, F.J. Grüner, A.R. Maier Uni HH, Hamburg, Germany M. Felber, K. Flöttmann, T. Lamb, H. Schlarb, C. Sydlo DESY, Hamburg, Germany F.J. Grüner, A.R. Maier, B. Zeitler CFEL, Hamburg, Germany E. Janas Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
	Laser driven plasma accelerators are offering high gradient (~ 10-100GV/m), high quality (low emittance, short bunch length) electron beams which can be suitable for future compact, bright and tunable light sources. In the framework of the Laboratory for Laser- and beam-driven plasma Acceleration (LAOLA) collaboration at Deutsches Elektronen-Synchrotron (DESY) the external injection experiment for injecting electron bunches from a conventional RF accelerator into the linear plasma wave is in progress. External injection experiments at REGAE (Relativistic Electron gun for Atomic Exploration) require sub-10 fs precision synchronization of laser and electron beams in order to perform a beam scan into the plasma wave by varying the delay between electron beam and laser pulses. In this paper we present a novel optical to microwave synchronization scheme, based on a balanced single output integrated Mach-Zehnder Modulator (MZM). The scheme offers a highly sensitive phase detector between a pulsed 800 nm Ti:Sa laser and a 3GHz microwave reference source. It is virtually independent of input laser power fluctuation and it offers femtosecond long-term precision. Together with the principal of operation of this setup, we will present promising preliminary experimental results of the detector stability.
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MOPD25	Time Domain Pickup Signal characterization for Low Charge Arrival-Time Measurements at FLASH	209
	A. Angelovski, R. Jakoby, A. Penirschke TU Darmstadt, Darmstadt, Germany M.K. Czwalinna, H. Schlarb, C. Sydlo DESY, Hamburg, Germany T. Weiland TEMF, TU Darmstadt, Darmstadt, Germany
	For the low charge operation mode at the European XFEL, high bandwidth cone-shaped pickups were developed as a part of the Bunch Arrival-time Monitors (BAMs). The simulation showed that the signal parameters of interest, the signal slope and bandwidth are improved by more than a factor of six compared to the state of the art pickups. The pickups are installed at FLASH for verification. In this paper, time-domain measurements of the cone-shaped pickups at FLASH are presented. The pickup signal is recorded with a high bandwidth sampling oscilloscope. Two channel measurements are conducted with a single and a combined pickup signal in order to analyze the orbit and charge dependence of the pickup signal parameters. The measured time domain pickup signal wave form is compared to the CST PARTICLE STUDIO simulation.
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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)

MOPD07

New MTCA.4-based Hardware Developments for the Control of the Optical Synchronization Systems at DESY

152

M. Felber, M.K. Czwalinna, H.T. Duhme, M. Fenner, C. Gerth, M. Heuer, T. Lamb, U. Mavrič, J.M. Mueller, P. Peier, H. Schlarb, S. Schulz, B. Steffen, C. Sydlo, M. Titberidze, T. Walter, R. Wedel, F. Zummack
DESY, Hamburg, Germany
E. Janas
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
T. Kozak, P. Prędki, K.P. Przygoda
TUL-DMCS, Łódź, Poland
J. Szewiński
NCBJ, Świerk/Otwock, Poland

Funding: This work has partly been funded by the Helmholtz Validation Fund Project MTCA.4 for Industry (HVF-0016)
The optical synchronization group at DESY is operating and continuously enhancing their laser-based synchronization systems for various facilities which need femtosecond-stable timing. These include the free-electron lasers FLASH and the upcoming European XFEL as well as the electron diffraction machine REGAE and the plasma acceleration test facilities. One of the major upgrades under development is the migration of the entire electronic control hardware to the new MTCA.4 platform which was introduced as the new standard for accelerator control in many facilities worldwide. In this paper we present the applied modules and the topology of the new systems. Main advantages are a compact design with higher performance, redundancy, and remote management.

Export •

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

MOPD12

Novel Femtosecond Level Synchronization of Titanium Sapphire Laser and Relativistic Electron Beams

174

M. Titberidze, F.J. Grüner, A.R. Maier
Uni HH, Hamburg, Germany
M. Felber, K. Flöttmann, T. Lamb, H. Schlarb, C. Sydlo
DESY, Hamburg, Germany
F.J. Grüner, A.R. Maier, B. Zeitler
CFEL, Hamburg, Germany
E. Janas
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland

Laser driven plasma accelerators are offering high gradient (~ 10-100GV/m), high quality (low emittance, short bunch length) electron beams which can be suitable for future compact, bright and tunable light sources. In the framework of the Laboratory for Laser- and beam-driven plasma Acceleration (LAOLA) collaboration at Deutsches Elektronen-Synchrotron (DESY) the external injection experiment for injecting electron bunches from a conventional RF accelerator into the linear plasma wave is in progress. External injection experiments at REGAE (Relativistic Electron gun for Atomic Exploration) require sub-10 fs precision synchronization of laser and electron beams in order to perform a beam scan into the plasma wave by varying the delay between electron beam and laser pulses. In this paper we present a novel optical to microwave synchronization scheme, based on a balanced single output integrated Mach-Zehnder Modulator (MZM). The scheme offers a highly sensitive phase detector between a pulsed 800 nm Ti:Sa laser and a 3GHz microwave reference source. It is virtually independent of input laser power fluctuation and it offers femtosecond long-term precision. Together with the principal of operation of this setup, we will present promising preliminary experimental results of the detector stability.

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

MOPD25

Time Domain Pickup Signal characterization for Low Charge Arrival-Time Measurements at FLASH

209

A. Angelovski, R. Jakoby, A. Penirschke
TU Darmstadt, Darmstadt, Germany
M.K. Czwalinna, H. Schlarb, C. Sydlo
DESY, Hamburg, Germany
T. Weiland
TEMF, TU Darmstadt, Darmstadt, Germany

For the low charge operation mode at the European XFEL, high bandwidth cone-shaped pickups were developed as a part of the Bunch Arrival-time Monitors (BAMs). The simulation showed that the signal parameters of interest, the signal slope and bandwidth are improved by more than a factor of six compared to the state of the art pickups. The pickups are installed at FLASH for verification. In this paper, time-domain measurements of the cone-shaped pickups at FLASH are presented. The pickup signal is recorded with a high bandwidth sampling oscilloscope. Two channel measurements are conducted with a single and a combined pickup signal in order to analyze the orbit and charge dependence of the pickup signal parameters. The measured time domain pickup signal wave form is compared to the CST PARTICLE STUDIO simulation.

Export •

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