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Crystal-Assisted Beam Extraction and Collimation at the U-70 Circular Accelerator

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arxiv 1102.2711 v1 pith:43PKL7YH submitted 2011-02-14 physics.acc-ph

Crystal-Assisted Beam Extraction and Collimation at the U-70 Circular Accelerator

A.G.Afonin , V.T.Baranov , S.Bellucci , S.A.Belov , S.Bini , V.N.Gorlov , G. Giannini , A.D.Ermolaev
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I.V.Ivanova D.M.Krylov V.A.Maisheev D.A.Savin E.A.Syshchikov V.I.Terekhov V.N.Chepegin Yu.A.Chesnokov P.N.Chirkov I.A.Yazynin
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classification physics.acc-ph
keywords beamcollimationacceleratorenergyextractionbeenu-70absorber
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New crystal technique - array of bent strips and a fan-type reflector, based on thin straight plates - have been used for research of extraction and collimation a circulating beam in the U-70 accelerator at the energy 50 GeV and 1.3 GeV. It is shown, that new devices can effectively steer a beam in a wide energy range. For protons with energy 50 GeV efficiency of extraction and collimation about 90 % has been achieved which is record for this method. Reduction of particle losses in 2-3 times was observed also in accelerator at application of different crystals in comparison with the usual one-stage collimation scheme of beam with a steel absorber.

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