Status Of The Free Electron Laser Experiment On The Super-ACO Storage Ring

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Abstract
Following the first storage ring Free Electron Laser (FEL) acheived between 1983 and 1986 in the visible on ACO, new experiments are under developpment on the new ring Super-ACO for extending the radiation from the visible to the UV and VUV ranges. For FEL experiments, Super-ACO is operated at 600MeV, with two stabilized opposite bunches, separated by 120ns. The permanent magnet optical klystron consists in two undulators of 10 periods of 13cm each, and a 0.5m long dispersive section in the middle, with a maximum deflection parameter K value of 5.75. The 18m long optical cavity and the mirrors were set-up at the end of January. A specific "low emittance" optics provides 2% of gain at 600MeV. The laser oscillation was acheived on Super-ACO in February at 633nm with 2Å of bandwidth. Tunability results from the undulators gap change. The FEL remains down to 3mA per bunch. Except from the microtemporal structure due to the storage Ring, the macrotemporal structure seems to be continuous, showing the high stability of the positron beam.© (1989) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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