BIW2012 - List of Authors (Lamb, T.)

Paper

Title

Page

Status of the Femtosecond Synchronization System at ELBE

12

M. Kuntzsch, A. Büchner, M. Gensch, U. Lehnert, F. Röser
HZDR, Dresden, Germany
M. Bousonville, M.K. Czwalinna, M. Felber, T. Lamb, H. Schlarb, S. Schulz, C. Sydlo
DESY, Hamburg, Germany

The superconducting electron accelerator ELBE at Helmholtz-Zentrum Dresden-Rossendorf is currently upgraded to enable continuous wave operation with bunch charges of up to 1 nC and durations down to 200 fs (RMS). The new beamline will drive a THz source and an X-ray source based on Thomson scattering. In collaboration with DESY, Hamburg, an optical synchronization system based on a mode locked master laser is currently being set up to ensure timing stability on the few 10 fs level. It allows high temporal resolution pump-probe experiments and new electron beam diagnostics like bunch arrival-time monitors. The synchronization system is assembled in a dedicated laboratory to ensure stable environmental conditions. In this paper the concept of the optical synchronization system is presented and first experience on the link stabilization system, its installation and commissioning is reported.

MOPG033

New Phase Stable Optical Fibre

101

M. Bousonville, M.K. Czwalinna, M. Felber, T. Ladwig, T. Lamb, H. Schlarb, S. Schulz, C. Sydlo
DESY, Hamburg, Germany
S. Hunziker
PSI, Villigen, Switzerland
S. Jabłoński, P. Kownacki
Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland

Linden Photonics offers a standard single mode fibre with a special liquid crystal polymer coating. This material has a negative coefficient of thermal expansion, which significantly reduces the change of signal delay due to temperature change. Other than with normal fibre cables, the thermal coefficient of delay (TCD) is not in the range from 40 to 130 ps/km/K, but below 7 ps/km/K. Thus it is nearly as good as the phase stabilized optical fibre (PSOF) by Furukawa (specification < 5 ps/km/K). The TCD of Linden Photonic cables have been measured at DESY. In order to make this comparable, we measured the PSOF by Furukawa and furthermore three standard optical fibre cables, too. As a result, a complete picture of the TCDs of different fibres will be presented. This information is very useful in order to design optical synchronisation systems in general. It is planned to use Linden Photonics cables for the long links (fibre lengths in a range from 0.4 to 3.5 km) of the laser based synchronisation system at XFEL.

Poster MOPG033 [0.613 MB]

Paper	Title	Page
MOBP03	Status of the Femtosecond Synchronization System at ELBE	12
	M. Kuntzsch, A. Büchner, M. Gensch, U. Lehnert, F. Röser HZDR, Dresden, Germany M. Bousonville, M.K. Czwalinna, M. Felber, T. Lamb, H. Schlarb, S. Schulz, C. Sydlo DESY, Hamburg, Germany
	The superconducting electron accelerator ELBE at Helmholtz-Zentrum Dresden-Rossendorf is currently upgraded to enable continuous wave operation with bunch charges of up to 1 nC and durations down to 200 fs (RMS). The new beamline will drive a THz source and an X-ray source based on Thomson scattering. In collaboration with DESY, Hamburg, an optical synchronization system based on a mode locked master laser is currently being set up to ensure timing stability on the few 10 fs level. It allows high temporal resolution pump-probe experiments and new electron beam diagnostics like bunch arrival-time monitors. The synchronization system is assembled in a dedicated laboratory to ensure stable environmental conditions. In this paper the concept of the optical synchronization system is presented and first experience on the link stabilization system, its installation and commissioning is reported.

MOPG033	New Phase Stable Optical Fibre	101
	M. Bousonville, M.K. Czwalinna, M. Felber, T. Ladwig, T. Lamb, H. Schlarb, S. Schulz, C. Sydlo DESY, Hamburg, Germany S. Hunziker PSI, Villigen, Switzerland S. Jabłoński, P. Kownacki Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
	Linden Photonics offers a standard single mode fibre with a special liquid crystal polymer coating. This material has a negative coefficient of thermal expansion, which significantly reduces the change of signal delay due to temperature change. Other than with normal fibre cables, the thermal coefficient of delay (TCD) is not in the range from 40 to 130 ps/km/K, but below 7 ps/km/K. Thus it is nearly as good as the phase stabilized optical fibre (PSOF) by Furukawa (specification < 5 ps/km/K). The TCD of Linden Photonic cables have been measured at DESY. In order to make this comparable, we measured the PSOF by Furukawa and furthermore three standard optical fibre cables, too. As a result, a complete picture of the TCDs of different fibres will be presented. This information is very useful in order to design optical synchronisation systems in general. It is planned to use Linden Photonics cables for the long links (fibre lengths in a range from 0.4 to 3.5 km) of the laser based synchronisation system at XFEL.
	Poster MOPG033 [0.613 MB]