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THYPA — Synchrotron Light Sources and FELs 29-Jun-06 11:00 - 11:30 THYPA — Synchrotron Light Sources and FELs Overview of FEL Injectors Future light sources based on high gain free electron lasers, require the production, ac- M. Ferrario (INFN/LNF) celeration and transport up to the undulator entrance of high brightness (low emittance, high peak current) electron bunches. Wake fields effects in accelerating sections and in magnetic bunch compressors typically contribute to emittance degradation, hence the photo-injector design and its operation is the leading edge for high quality beam production and for the success of the future light sources. RF guns, photo-cathode materials, laser pulse shaping and synchronization systems are evolving towards a mature technology to produce high quality and stable beams. Nevertheless reduction of thermal emittance, damping of emittance oscillations and bunch compression are still the main issues and challenges for injector designs. With the advent of Energy Recovery Linacs, superconducting RF guns have been also considered in many new projects as a possible electron source operating in CW mode. An overview of recent advancements and future perspectives in FEL injectors will be illustrated in this talk, including a comparison of merits and issues of RF compression versus magnetic compression techniques. Chair: A.F. Wrulich (PSI, Villigen) 377 THYPA01
THOPA01 THOPA02 THOPA03 29-Jun-06 11:30 - 12:30 THOPA — Synchrotron Light Sources and FELs THOPA — Synchrotron Light Sources and FELs Formation of Electron Bunches for Harmonic Cascade X-ray Free Electron Lasers M. Cornacchia, S. Di Mitri, G. Penco (ELETTRA) P. Emma, G.V. Stupakov (SLAC) A. Zholents (LBNL) A relatively long electron bunch is required for an operation of harmonic cascade free electron lasers (FELs). This is because they repeatedly employ a principle when the radiation produced in one cascade by one group of electrons proceeds ahead and interacts with other electrons from the same electron bunch in the next cascade. An optical laser is used to seed the radiation in the first cascade. Understandably the length of the electron bunch in this situation must accommodate the length of the x-ray pulse multiplied by a number of cascades plus a time jitter between the arrival time of the electron bunch and a seed laser pulse. Thus a variation of the peak current along the electron bunch as well as slice energy spread and emittance may affect the performance of the FEL. In this paper we analyze all possible sources affecting the distributions and interplay between them and show how desirable distributions can be produced. Results are illustrated with simulations using particle tracking codes. Status of the SCSS Test Accelerator and XFEL Project in Japan Construction of the SCSS* 250 MeV test ac- T. Shintake, T. Ishikawa, H. Kitamura (RIKEN Spring-8 Harima) celerator was completed in October 2005, and the beam commissioning was started in November 2005. The first light at visible wavelength, which is the spontaneous radiation from undulator, was observed right after machine commissioning. We expect the first SASE beam around 60 nm in 2006. The purpose of the test accelerator is to assemble all hardware components in a real machine, and check their performance, reliability and stability. It is also very important to build all control software and link to the main frame to see system performance. All experience will provide feedback to 8 GeV XFEL design, whose construction will start in April 2006. *http://www-xfel.spring8.or.jp An Integrated Femtosecond Timing Distribution System for XFELs J. Kim, J. Burnham, dc. Cheever, J. Chen, F.X. Kaertner (MIT) M. Ferianis (ELETTRA) F.O. Ilday (Bilkent University) F. Ludwig, H. Schlarb, A. Winter (DESY) Tightly synchronized lasers and rf-systems with timing jitter in the few femtoseconds range are an important component of future x-ray free electron laser facilities. In this paper, we present an optical-rf phase detector that is capable of extracting an rf-signal from an optical pulse stream without amplitude-to-phase conversion. Extraction of a microwave signal with less than 10 fs timing jitter (from 1 Hz to 10 MHz) from an optical pulse stream is demonstrated. Scaling of this component to sub-femtosecond resolution is discussed. Together with low noise mode-locked lasers, timing-stabilized optical fiber links and compact optical cross-correlators, a flexible femtosecond timing distribution system with potentially sub-10 fs precision over distances of a few kilometres can be constructed. Experimental results on both synchronized rf and laser sources will be presented. *A. Winter et al. "Synchronization of Femtosecond Pulses", Proceedings of FEL 2005.**J. Kim et al. "Large-Scale Timing Distribution and RF-Synchronization for FEL Facilities", Proc. of FEL 2004. 378 Chair: A.F. Wrulich (PSI, Villigen)
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Contents MOXPA — Linear Colliders
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Contents MOPCH056 Development of Hi
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Contents MOPCH140 Compensation of L
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Contents MOPLS020 Rad-hard Luminosi
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Contents MOPLS102 Beam Dynamic Stud
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TUOCFI — Accelerator Technology C
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Contents TUPCH074 Fast and Precise
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Contents TUPCH159 High Power Wavegu
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Contents TUPLS039 Proposal of a Nor
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Contents TUPLS127 Permanent Deforma
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Contents WEPCH020 Extending the Lin
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Contents WEPCH108 FFAG Computation
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Contents WEPCH192 Compact Electron
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Contents WEPLS078 Design Study of t
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THOPA — Synchrotron Light Sources
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Contents THPCH042 Numerical Estimat
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Contents THPCH124 Visual Programmin
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Contents THPLS008 Commissioning of
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Contents THPLS099 Fast Kicker Syste
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MOXPA — Linear Colliders, Lepton
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MOYBPA — Circular Colliders 26-Ju
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MOZBPA — Synchrotron Light Source
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WEOAPA — Linear Colliders, Lepton
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Amro, A. THPLS043 An, D.H. TUPCH070
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Bates, D.A. WEPCH150 Battaglia, D.
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Bondarenko, A.V. MOPCH057, MOPCH073
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Chung, C.C. TUPCH105 Chung, C.W. TU
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Neuenschwander, R.T. WEPCH005, THPC
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Reiche, S. MOPCH028, WEPCH150 Reich
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Saewert, G.W. TUPLS069 Safranek, J.
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Yurkov, M.V. TUPCH081, THPLS133 Yus
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