RUPAC2012 - List of Authors (Sytov, A.I.)

Paper

Title

Page

New Ideas for Crystal Collimation

79

V.V. Tikhomirov, A.I. Sytov
Belarussian State University, Scientific Research Institute of Nuclear Problems, Minsk, Belarus

Beam halo represents considerable threat for superconducting magnets. Crystals can increase the efficiency of collimation system being used both in channeling and volume reflection modes. We suggest to facilitate both these approaches using, respectively, the crystal cut method* to increase channeling capture efficiency and multiple volume reflection from different planes of one bent crystal(**,***) to increase the volume reflection angle. Efficiency of these methods drastically depends on the halo particle transverse distribution. The first approach is most efficient at smallest transverse diffusion rate while the second one in the opposite case. We also demonstrate that the miscut, i.e. the nonparallelity of lateral crystal surface and atomic planes, can considerably affect the collimation efficiency at present crystal collimation SPS experiments while will not be so important in the real LHC environment.
* V.V. Tikhomirov, JINST 2(2007) P08006.
** V.V. Tikhomirov, Phys. Lett. B. 655(2007)217.
*** W. Scandale, et al, Phys. Lett. B. 682(2009)274; EPL. 93(2011)56002.

Slides TUCCH01 [2.222 MB]

Paper	Title	Page
TUCCH01	New Ideas for Crystal Collimation	79
	V.V. Tikhomirov, A.I. Sytov Belarussian State University, Scientific Research Institute of Nuclear Problems, Minsk, Belarus
	Beam halo represents considerable threat for superconducting magnets. Crystals can increase the efficiency of collimation system being used both in channeling and volume reflection modes. We suggest to facilitate both these approaches using, respectively, the crystal cut method* to increase channeling capture efficiency and multiple volume reflection from different planes of one bent crystal(,) to increase the volume reflection angle. Efficiency of these methods drastically depends on the halo particle transverse distribution. The first approach is most efficient at smallest transverse diffusion rate while the second one in the opposite case. We also demonstrate that the miscut, i.e. the nonparallelity of lateral crystal surface and atomic planes, can considerably affect the collimation efficiency at present crystal collimation SPS experiments while will not be so important in the real LHC environment. V.V. Tikhomirov, JINST 2(2007) P08006. V.V. Tikhomirov, Phys. Lett. B. 655(2007)217. * W. Scandale, et al, Phys. Lett. B. 682(2009)274; EPL. 93(2011)56002.
	Slides TUCCH01 [2.222 MB]