CERN Accelerating science

Article
Report number	hep-ex/0111001 ; CERN-LHC-2000-007-MMS ; CERN-LHC-2000-7 ; CERN-LHC-2000-07 ; CERN-LHC-2000-007 ; CERN-LHC-2000-007-MMS
Title	Application of Bent Crystals at IHEP 70-GeV Accelerator to Enhance the Efficiency of its Usage
Author(s)	Kotov, V.I. (Serpukhov, IHEP) ; Afonin, A.G. (Serpukhov, IHEP) ; Biryukov, V.M. (Serpukhov, IHEP) ; Chesnokov, Yu.A. (Serpukhov, IHEP) ; Galyaev, N.A. (Serpukhov, IHEP) ; Gres, V.N. (Serpukhov, IHEP) ; Maisheev, V.A. (Serpukhov, IHEP) ; Medvedev, V.A. (Serpukhov, IHEP) ; Minchenko, A.V. (Serpukhov, IHEP) ; Terekhov, V.I. (Serpukhov, IHEP) ; Troyanov, E.F. (Serpukhov, IHEP) ; Fedotov, Yu.S. (Serpukhov, IHEP) ; Zapolsky, V.N. (Serpukhov, IHEP) ; Zelenov, B.A. (Serpukhov, IHEP) ; Ivanov, Yu.M. (St. Petersburg, INP) ; Scandale, W. (CERN)
Affiliation	(IHEP Protvino) ; (PNPI St. Petersburg) ; (CERN)
Publication	2000
Imprint	22 Dec 2000
Number of pages	5
Series	(Report)
In:	7th European Particle Accelerator Conference, Vienna, Austria, 26 - 30 Jun 2000, pp.e-proc. 364
Subject category	Accelerators and Storage Rings
Abstract	Bent crystal was extracting 70-GeV protons with average intensity 4x10$^{11}$ (as measured in external beamline) per spill of  1.6 s duration, in parallel to the simultaneous work of two internal targets in the accelerator ring. An additional crystal, placed in the external beamline, was deflecting a small part of the extracted beam with intensity  10$^7$ protons toward another physics experiment. Crystal-extracted beam had a typical size of 4 mm by 4 mm fwhm at the end of the external beamline. Measurements for the extraction efficiency and other characteristics at the simultaneous work of four experimental set-ups are presented. With crystal working in the above-said regime during one month, no degradation of channeling was observed. The studies of extraction efficiency have been continued with new crystals.

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