Abstract
New experimental results on the deflection of high energy protons in a bent germanium crystal are presented. At 450 GeV/c, the 50 mm long crystal gave record deflection efficiencies up to 60% for small angles (1 mrad), while at angles as large as 12 mrad, the efficiency is about 25 times larger than for a silicon crystal of the same size. The experimental results are in good agreement with a model for channeling and deflection developed by Ellison (1982) and give together with a similar comparison for a 200 GeV/c beam-confidence in extrapolations to higher energies (e.g., to LHC), other crystal materials or different deflection angles.
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