Proton beam extraction from the CERN SPS by means of a bentsilicon crystal is reported at three dierent energies, 14 GeV, 120 GeV and 270 GeV. The experimental results are compared to computer simulations which contain a sound model of the SPS accelerator as well as the channeling phenomena in bentcrystals. The overall energy dependence of crystal assisted proton beam extraction is understood and provides the basis to discuss such a s c heme for future accelerators. to besubmitted to Physics Letters B
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