| Paper |
Title |
Page |
| TUPPH051 |
Conceptual Ideas for the Temporal Overlap of the Electron Beam and the Seed Laser for sFLASH
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363 |
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- R. Tarkeshian, J. Boedewadt, M. Drescher, J. Rossbach
Uni HH, Hamburg
- R. Ischebeck
PSI, Villigen
- H. Schlarb, S. Schreiber
DESY, Hamburg
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sFLASH is a seeding FEL experiment at FLASH/DESY, to introduce a 30nm HHG-based XUV-beam laser to the electron bunches of FLASH at the entrance of a 10m variable-gap undulator. The temporal overlap between the electron beam and HHG is important for the FEL process. The installation of a 3rd harmonic cavity at FLASH will provide a long high current electron beam (at kA level) over ~600fs (FWHM) bunch duration. The duration of the HHG laser pulse will be about 30fs (FWHM).The desired overlap can be achieved in steps. One approach will be to synchronize the drive laser (Ti:Sapphire, 800nm) of HHG and the incoherent spontaneous synchrotron radiation of the undulator at a sub-picosecond precision. In a following step the overlap can be improved by scanning within the sub-picosecond uncertainty. The possibility of using a streak camera to detect both the 800nm laser and the spontaneous undulator radiation pulses without perturbing FLASH user operation is investigated. To match the power levels, the laser beam has to be attenuated by several orders in magnitude. The layout of the experiment and preliminary simulation results of generation and transport of both light pulses are presented.
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| FRAAU01 |
Status of FLASH
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533 |
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- K. Honkavaara, B. Faatz, S. Schreiber
DESY, Hamburg
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FLASH, the FEL user facility at DESY, is operated with an electron beam energy up to 1 GeV corresponding to a photon wavelength down to 6.5 nm. The shutdown in summer 2007 was followed by a three month commissioning and study period. A new run of FEL experiments started in November 2007. The full year 2008 is dedicated to beam operation: about half of the time is scheduled for FEL users, and the rest for accelerator and FEL physics studies. Here we report the present status of FLASH as a FEL user facility.
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| FRAAU05 |
Cathode Issues at the FLASH Photoinjector
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552 |
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- S. Schreiber, S. Lederer
DESY, Hamburg
- J. H. Han
Diamond, Oxfordshire
- P. M. Michelato, L. Monaco, D. Sertore
INFN/LASA, Segrate (MI)
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At the free-electron laser user facility FLASH at DESY cesium telluride photocathodes are in use in the laser driven rf gun based injector. We report on issues concerning quantum efficiency, lifetime, and darkcurrent emission observed recently.
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