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W. Scandale

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Crystal-aided slow-extraction in the SPS Working group to define Motivations Scenario Crystals and goniometer Possible test: resources and schedule crystal Far deflection option Crystal location 51895/9

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Crystal-aided slow-extraction in the SPS Position reproducibility 5 μm Angular reproducibility 1 μrad

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Crystal-aided slow-extraction in the SPS Crystal parameters: thickness 1-4 mm CH deflection angle 60-150 µrad MVR deflection angle ≈ 60 µrad open area ≤ 5 x 20 mm 2 ≈ 130mm Quasimosaic bending

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Non-resonant extraction

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Impact and angle parameters

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Summary of the future perspectives of UA9-SE Bent crystals may intercept particles in the separatix that otherwise would hit the wires of the ES deflecting them into the extraction channel, well inside the ES aperture. The beam loss and the debris produced by ES wires will be thus shifted in a safer area of the accelerator. Useful for high intensity operation Bent crystals may intercept the totality of the particles to be extracted, deflecting them into the extraction channel by the same angle as the ES, thus allowing resonant extraction without ES. Useful for high intensity operation A beam shaker could enhance the halo population and the diffusion speed, shaping it to produce constant spill-out from the beam core. A bent crystal could intercept the totality of the beam halo deflecting it into the extraction channel by the same angle as the ES, in a non- resonant extraction process without ES in the extraction channel. Elegant scenario for integrating extraction in an accelerator with reduced mechanical aperture such as the LHC or the FCC.

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Thanks for your attention thanks to F. Galluccio, Y. Ivanov, Y. Gavrikov and Y. Chesnokov for the help in preparing this talk

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