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Author Predki, P. ♦ Kozak, T. ♦ Szewinski, J. ♦ Napieralski, A.
Sponsorship IEEE Nuclear and Plasma Sciences Society ♦ Computer Applications in Nuclear and Plasma Sciences (CANPS) ♦ Lawrence Berkeley Lab. ♦ Lawrence Livermore Nat. Lab. ♦ APS ♦ College of William and Mary ♦ Continuous Electron Beam Accelerator Facility ♦ NASA ♦ Defence Nuclear Agency ♦ Sandia National Laboratories ♦ Jet Propulsion Laboratory ♦ Brookhaven Nat. Lab. ♦ Lawrence Livermore Nat. Lab ♦ IEEE/NPPS Radiat. Effects Committee ♦ Defence Nuclear Agency/DoD ♦ Sandia National Laboratories/DOE ♦ Jet Propulsion Laboratory/NASA ♦ Phillips Lab./DoD
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©1963
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics ♦ Modern physics ♦ Technology ♦ Medicine & health ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Synchronization ♦ Servers ♦ Software ♦ Laser tuning ♦ Adaptive optics ♦ Digital signal processing ♦ $\mu$TCA ♦ Control ♦ DESY ♦ European XFEL ♦ FLASH ♦ optical synchronization system ♦ systems ♦ VME
Abstract Proper operation of FELs such as the Free-Electron Laser in Hamburg (FLASH)and the European X-Ray Free-Electron Laser (XFEL), which is currently under construction in Hamburg at DESY, requires many specific subsystems to be synchronized with a precision exceeding 10 femtoseconds. Those components are often separated by several hundred meters at FLASH or even kilometers in case of the European XFEL. Such distances mean that it is extremely difficult to use only conventional RF signal distribution in coaxial cables for synchronization because of high losses and excessive phase drifts, while electromagnetic interference is also an issue. Therefore, a laser-based synchronization scheme can be employed in parallel. In this case, the synchronization signals are transmitted via length-stabilized optical fibers. Such an architecture is currently being used at FLASH and will also be the main means of synchronization at the European XFEL. The hardware for such a synchronization system consists of many optical elements such as commercial lasers and self-built free-space and fiber optic setups. However, a significant part of it is also the electronics responsible for control, diagnostics and signal processing as well as high-level servers and front-end software running on those devices. Currently, the VME standard is used throughout FLASH as the basis for the control system digital hardware. For the European XFEL, however, an architecture with a high level of reliability and availability is required as well as one with higher data acquisition and processing rates. Because of that, the Micro Telecommunications Computing Architecture (μTCA) had been chosen. It is a fairly new standard, provides significantly better performance and employs modern technological solutions making it more suitable for modern accelerator applications than the older VME architecture. The paper presents the latest improvements in the control software for the optical synchronization system based on the VME standard. Servers for phase-locking the lasers as well as controlling the fiber link stabilization units are described in detail. Plans for migration to the new infrastructure are also outlined.
Description Author affiliation :: Nat. Centre for Nucl. Res., Swierk, Poland
Author affiliation :: Dept. of Microelectron. & Comput. Sci., Tech. Univ. of Lodz, Lodz, Poland
ISSN 00189499
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2013-01-01
Publisher Place U.S.A.
Rights Holder Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Volume Number 60
Issue Number 5
Size (in Bytes) 1.68 MB
Page Count 8
Starting Page 3461
Ending Page 3468

Source: IEEE Xplore Digital Library