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IHEP 98 - 34
A.G.Afonin, A.A.Arkhipenko, V.I.Baranov, V.M.Biryukov, Yu.A.Chesnokov, V.A.Gavrilushkin, V.N.Gres, V.I.Kotov, V.A.Maisheev, A.V.Minchenko, V.I.Terekhov, E.F.Troyanov, V.A.Zelenov (IHEP, Protvino, Russia), B.A.Chunin, A.S.Denisov, M.G.Gordeeva, Yu.M.Ivanov, A.A.Petrunin, V.V.Skorobogatov (PNPI, S.-Peterburg, Russia)
High-efficiency multipass extraction of 70 GeV protons from accelerator with a short bent crystal
Protvino, 1998.- p.6, figs. 2, refs.:13.

Using channeling in a 5-mm crystal with a bending angle of 1.5 mrad, a radical increase in the efficiency of beam extraction from the accelerator was achieved due to an increased number of particle encounters with crystal. The measured world-highest efficiency of crystal extraction, over 40%, is in good agreement with theory predictions. The extracted beam intensity of 6x10**11 ppp was obtained, five orders of magnitude higher than with the previous results.

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