Abstract
We present theory for coherent effects observed in crystal collimation experiments that is in good quantitative agreement with the RHIC and Tevatron data. We show that these effects are caused by a coherent scattering on the field of bent crystal atomic planes, which amplifies beam diffusion in accelerator by orders of magnitude compared to the scattering in amorphous material. This coherent scattering could replace the traditional amorphous scattering in accelerator collimation systems. We predict that for negative particles this effect is as strong as for positive ones, opening a principle way for efficient crystal steering of negative particles at accelerators. Predictions are made for high energy accelerators where crystal collimation is seen as an interesting application.
Highlights
Bent crystal technique is well established for channeling high-energy beams, in particular for beam extraction from accelerators [1]
Monte Carlo predictions, suggesting a "multipass" mode of crystal extraction where efficiency is dominated by the multiplicity of particle encounters with a short crystal in a ring, lead to the record high efficiency demonstrated at IHEP [8]
Summary Crystal collimation studies, besides promising a very high efficiency of the technique in colliders, reveal a new interesting physics of beam scattering off the coherent field of bent crystal atomic planes
Summary
Bent crystal technique is well established for channeling high-energy beams, in particular for beam extraction from accelerators [1]. [25] gave explanation of the plateau effect in crystal collimation relating it to the coherent scattering (“reflection”) of particles on the field of bent crystal atomic planes. In order to understand fully the origin of the plateau effect, we simulated RHIC and Tevatron experiments studying the particle dynamics in single and multiple interactions with a bent crystal in different angular ranges in the environment of collimation experiment.
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