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Other Keywords |
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| MOPCH034 |
On a Skeleton CASSINI Ovals Current Undulator
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undulator, electron, laser, radiation |
119 |
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- A.M. Mihalache, V.I.R. Niculescu
INFLPR, Bucharest - Magurele
- V. Babin
INOE, Bucharest
- M.R. Leonovici, C. Stancu
Bucharest University, Faculty of Physics, Bucharest-Magurele
- F. Scarlat
Valahia University, Faculty of Sciences, Targoviste
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A new undulator structure for free electron lasers was presented. Current skeleton CASSINI ovals produced magnetic fields which are spatially periodic. The current structure was in the shape of stacks of modified CASSINI ovals. The current has alternating directions. The magnetic field components for each wire present C2 symmetry. CASSINI undulator transverse cross-section* was approximated by polygons. In cartesian coordinates the Biot-Savart law was analytically evaluated. The magnetic field was mainly transversal and easily adjusted with the current. The versatility of this structure introduces a new type of two beams longitudinal undulator or wiggler design for transverse moments.
*Cassini curve; C. Mihu, I.P. Iambor-1989.
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| TUPCH041 |
Electro-optic Diagnostics on the Daresbury Energy Recovery Linac
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electron, laser, CSR, diagnostics |
1094 |
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- P.J. Phillips, W.A. Gillespie
University of Dundee, Nethergate, Dundee, Scotland
- S.P. Jamison
CCLRC/DL/ASTeC, Daresbury, Warrington, Cheshire
- A. MacLeod
UAD, Dundee
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An electro-optic longitudinal bunch profile monitor is being implemented on the 4GLS prototype energy recovery linac (ERL/p) at Daresbury Laboratories and will be used both to characterise the electron bunch and to provide a testbed for electro-optic techniques. The electro-optic station is located immediately after the bunch compressor, and within the FEL cavity; its location allows it to draw on nearby beam profile monitors and CTR and CSR diagnostics for calibration and benchmarking. We discuss the implementation and planned studies on electro-optic diagnostics with this diagnostic station.
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| TUPCH188 |
Phase Stability of the Next Generation RF Field Control for VUV- and X-ray Free Electron Laser
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klystron, electron, controls, laser |
1453 |
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- F. Ludwig, M. Hoffmann, H. Schlarb, S. Simrock
DESY, Hamburg
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For pump and probe experiments at VUV- and X-ray free electron lasers the stability of the electron beam and timing reference must be guaranteed in phase for the injector and bunch compression section within a resolution of 0.01 degree (rms) and in amplitude within 1 10-4 (rms). The performance of the field detection and regulation of the acceleration RF directly influences the phase and amplitude stability. In this paper we present the phase noise budget for a RF-regulation system including the noise characterization of all subcomponents, in detail down-converter, ADC sampling, vector-modulator, master oscillator and klystron. We study the amplitude to phase noise conversion for a detuned cavity. In addition we investigate the beam jitter induced by these noise sources within the regulation and determine the optimal controller gain. We acknowledge financial support by DESY Hamburg and the EUROFEL project.
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| THOPA03 |
An Integrated Femtosecond Timing Distribution System for XFELs
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laser, electron, controls, FEL |
2744 |
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- J. Kim, J. Burnham, dc. Cheever, J. Chen, F.X. Kaertner
MIT, Cambridge, Massachusetts
- M. Ferianis
ELETTRA, Basovizza, Trieste
- F.O. Ilday
Bilkent University, Bilkent, Ankara
- F. Ludwig, H. Schlarb, A. Winter
DESY, Hamburg
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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.
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