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| MOPKF010 |
The Output Performance of the BESSY Multi-stage HGHG-FEL
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gun, alignment, damping, brilliance |
318 |
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- A. Meseck, M. Abo-Bakr, B.C. Kuske
BESSY GmbH, Berlin
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The BESSY soft X-ray FEL is planned as a High Gain Harmonic Generatio(HGHG) FEL multi-user facility covering the VUV to soft X-ray spectral range(0.02 keV - 1. keV). A photoinjector and a superconducting 2.3GeV CW linac will feed three independent HGHG-FEL-lines. As the efficiency of the interaction between the radiation and the electron beam is higher in a helical undulator, one would tend to prefer such a device for the HGHG scheme. Also a higher K-value of the modulators seems to be advantageous. This is not necessarily the case. We present simulation studies for the BESSY-HGHG-FELs and discuss the output performance for ‘‘helical stages'' and increased K value of the modulators.
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| MOPKF011 |
Output Variability of the BESSY Soft X-ray FEL
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gun, alignment, damping, brilliance |
321 |
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- A. Meseck, M. Abo-Bakr, B.C. Kuske
BESSY GmbH, Berlin
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The BESSY soft X-ray FEL is planned as a High Gain Harmonic Generation HGHG) FEL multi-user facility covering the VUV to soft X-ray spectral rang(0.02 keV - 1 keV). A photoinjector and a superconducting $2.3\,GeV$ CW linac will feed three independent HGHG-FEL-lines. Depending on the optimisation criteria, it is possible to obtain either maximum output power or pure spectrum from the same HGHG-line. We present simulation studies for the BESSY-HGHG-FELs and discuss the possible variability of the output performance.
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| MOPKF030 |
"ARC-EN-CIEL" a Proposal for a 4th Generation Light Source in France
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wiggler, damping, alignment, laser |
366 |
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- M.-E. Couprie, D. Garzella, B. Gilquin, P. Monot, L. Nahon
CEA/DSM, Gif-sur-Yvette
- O.V. Chubar, A. Loulergue
SOLEIL, Gif-sur-Yvette
- M. Desmons, M. Jablonka, F. Meot, A. Mosnier
CEA/DSM/DAPNIA, Gif-sur-Yvette
- J.-R. Marquès
LULI, Palaiseaux
- J.-M. Ortega
LURE, Orsay
- A. Rousse
LOA, Palaiseau
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An accelerator based 4th generation source is proposed to provide the user community with coherent femtosecond light pulses in the UV to X ray range. The project is based on a CW 700 MeV superconducting linac delivering high charge, subpicosecond, low emittance electron bunches with high repetition rate. This facility allows for testing High Gain Harmonic Generation seeded with high harmonics in gases, as well as the standard SASE mode, covering a spectral range down to 0.8 nm and 5 nm respectively. In addition, two beam loops are foreseen to increase the beam current in using the energy recovery technique. They will accommodate undulators for the production of femtosecond synchrotron radiation in the IR, VUV and X ray ranges together with a FEL oscillator in the 10 nm range.
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| THPLT023 |
The Use of Photon Monitors at the Swiss Light Source
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antiproton, gun, target, lattice |
2517 |
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- J. Krempasky, M. Böge, T. Schilcher, V. Schlott, T. Schmidt
PSI, Villigen
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The photon beam position monitors (PBPM) in a synchrotron radiation facility are important tools for beam-line and machine diagnostics since they deliver position and angle information directly from the radiation source point. In the last two years a number of PBPMs have been installed and commissioned at the Swiss Light Source (SLS). Their readouts have been systematically studied and the results have been correlated with data from the digital beam position monitor (DBPM) system. It turns out that the PBPMs help understanding the influence of insertion device gap changes on photon beam position and thus on photon flux and/or energy resolution near the beam-line experimental stations. In addition to the global fast orbit feedback (FOFB), a local slow feedback based on PBPM data has been implemented to remove the remaining systematic effects of the DBPM system and to stabilize the photon beam to a micron level at the experimental station.
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| THPLT024 |
Commissioning and Operation of the SLS Fast Orbit Feedback
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antiproton, gun, target, lattice |
2520 |
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- T. Schilcher, M. Böge, B. Keil, P. Pollet, V. Schlott
PSI, Villigen
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The SLS Fast Orbit Feedback (FOFB) was successfully commissioned in 2003. Since November 2003 it runs during user operation of the accelerator. Taking into account 72 Digital Beam Position Monitors (DBPMs), the FOFB applies SVD-based global orbit corrections for 72 horizontal (x) and 72 vertical (y) correctors at a rate of 4 kHz, compared to ~0.5 Hz for the Slow Orbit Feedback (SOFB) that was used so far. While the SOFB was important for the elimination of orbit drifts due to temperature changes and slowly moving insertion device (ID) gaps, the FOFB is also able to damp orbit oscillations that are caused by fast changes of ID gaps or magnets, by ground and girder vibrations, 3 Hz booster crosstalk and power supply noise. This report presents experience from commissioning and user operation of the FOFB.
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