| Paper | Title | Page |
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| TUP086 | Experiment Preparation Towards a Demonstration of Laser Plasma Based Free Electron Laser Amplification | 569 |
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| One direction towards compact Free Electron Laser is to replace the conventional linac by a laser plasma driven beam, provided proper electron beam manipulation to handle the value of the energy spread and of the divergence. Applying seeding techniques also enables to reduce the required undulator length. Rapidly developing Laser Wakefield Accelerators (LWFA) are already able to generate synchrotron radiation. With the presently achieved electron divergence and energy spread an adequate beam manipulation through the transport to the undulator is needed for FEL amplification. A test experiment for the demonstration of FEL amplification with a LWFA is under preparation in the frame of the COXINEL ERC contract in the more general context of LUNEX5. Electron beam transport follows different steps with strong focusing thanks to variable strength permanent magnet quadrupoles, demixing chicane with conventional dipoles, and a second set of quadrupoles for further focusing in the undulator. Progress on the equipment preparation and expected performance are described. | ||
| TUP087 | The Status of LUNEX5 Project | 574 |
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| LUNEX5 (free electron Laser Using a New accelerator for the Exploitation of X-ray radiation of 5th generation) aims at investigating the production of short, intense, coherent Free Electron Laser (FEL) pulses in the 40-4 nm spectral range. It comprises a 400 MeV superconducting Linear Accelerator for high repetition rate operation (10 kHz), multi-FEL lines and adapted for studies of advanced FEL schemes, a 0.4 - 1 GeV Laser Wake Field Accelerator (LWFA) for its qualification by a FEL application, a single undulator line enabling seeding with High order Harmonic in Gas and echo configurations and pilot user applications. Concerning the superconducting linac, the electron beam dynamics has been modified from a scheme using a third harmonic linearizer and a compression chicane to dog-leg coupled to sextupoles. Besides, the choice of the gun is under revision for fulfilling to 10 kHz repetition rate. Following transport theoretical studies of longitudinal and transverse manipulation of a LWFA electron beam enabling to provide theoretical amplification, a test experiment is under preparation in collaboration with the Laboratoire d’Optique Appliquée towards an experimental demonstration. | ||
THP078 |
A High Repetition Rate, Single-Shot Recording Scheme for Short Pulses | |
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| We demonstrate high repetition rate (up to 88 MHz) single shot recordings of pulses shapes, using a novel opto-electronic strategy. The technique is based on the classical spectral encoding technique, but at a much higher repetition rate than with the state-of-art strategy (which is limited by camera speed). In the present demonstration, the signals are coherent THz pulses emitted at SOLEIL, and the resolution is in the ps range. However the technique is not specific to THz pulses and can be potentially adapted to other wavelengths and situations, provided it is possible to imprint the ultrafast signal on chirped laser pulses (through electro-optic sampling, frequency mixing, transient reflectivity, etc.). | ||
THP079 |
Observation of Laser-Sliced Electron Bunch using a YBCO Detector at UVSOR-III | |
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When the current of a storage ring is near the microbunching instability threshold, a strong burst of CSR instability may be seeded by an external laser pulse*. Here we present real time recordings of the coherent synchrotron radation (CSR) pulse shapes emitted by sliced electron bunch using a new technology based on YBCO thin film detector combined with the state-of-the-art oscilloscope. This allows to make measurements in real time of the sliced electron bunch dynamics over several turns. These experimental observations open a new way to make severe comparisons with existing and future models of the microbunching instability. Tests of a Vlasov-Fokker-Planck model are presented.
* Byrd et al. Phys. Rev. Lett. 97, 074802 (2006) |
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