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Inverse Cerenkov acceleration and inverse free-electron laser experimental results for staged electron laser acceleration

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18 Author(s)
Campbell, L.P. ; STI Optronics Inc., Bellevue, WA, USA ; Dilley, C.E. ; Gottschalk, S.C. ; Kimura, W.D.
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The goal of the staged electron laser acceleration (STELLA) experiment is to demonstrate staging of the laser acceleration process whereby an inverse free electron laser (IFEL) will be used to prebunch the electrons, which are then accelerated in an inverse Cerenkov accelerator (ICA). As preparation for this experiment, a new permanent magnet wiggler for the IFEL was constructed and the ICA system was modified. Both systems have been tested on a new beamline specifically built for STELLA. The improved electron beam (e-beam) with its very low emittance (0.8 mm-mrad normalized) enabled focusing the e-beam to an average radius (1σ) of 65 μm, within the ICA interaction region. This small e-beam focus greatly enhanced the ICA process and resulted in electron energy spectra that have demonstrated the best agreement to date in both overall shape and magnitude with the model predictions. The electron energy spectrum using the new wiggler in the IFEL was also measured. These results will be described as well as future improvements to the STELLA experiment

Published in:

Plasma Science, IEEE Transactions on  (Volume:28 ,  Issue: 4 )

Date of Publication:

Aug 2000

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