• Open Access

Crystal collimator systems for high energy frontier

A. I. Sytov, V. V. Tikhomirov, and A. S. Lobko
Phys. Rev. Accel. Beams 20, 071001 – Published 13 July 2017
An article within the collection: FCC 2016 Conference Edition

Abstract

Crystalline collimators can potentially considerably improve the cleaning performance of the presently used collimator systems using amorphous collimators. A crystal-based collimation scheme which relies on the channeling particle deflection in bent crystals has been proposed and extensively studied both theoretically and experimentally. However, since the efficiency of particle capture into the channeling regime does not exceed ninety percent, this collimation scheme partly suffers from the same leakage problems as the schemes using amorphous collimators. To improve further the cleaning efficiency of the crystal-based collimation system to meet the requirements of the FCC, we suggest here a double crystal-based collimation scheme, to which the second crystal is introduced to enhance the deflection of the particles escaping the capture to the channeling regime in its first crystal. The application of the effect of multiple volume reflection in one bent crystal and of the same in a sequence of crystals is simulated and compared for different crystal numbers and materials at the energy of 50 TeV. To enhance also the efficiency of use of the first crystal of the suggested double crystal-based scheme, we propose: the method of increase of the probability of particle capture into the channeling regime at the first crystal passage by means of fabrication of a crystal cut and the method of the amplification of nonchanneled particle deflection through the multiple volume reflection in one bent crystal, accompanying the particle channeling by a skew plane. We simulate both of these methods for the 50 TeV FCC energy.

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  • Received 9 July 2016

DOI:https://doi.org/10.1103/PhysRevAccelBeams.20.071001

Published by the American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

Published by the American Physical Society

Physics Subject Headings (PhySH)

  1. Research Areas
Accelerators & Beams

Collections

This article appears in the following collection:

FCC 2016 Conference Edition

A collection of articles that expand upon original research presented at the Annual Workshop of the International Future Circular Collider (FCC) Collaboration to be held in Rome, Italy, 10th to 15th April 2016

Authors & Affiliations

A. I. Sytov*, V. V. Tikhomirov, and A. S. Lobko

  • Institute for Nuclear Problems, Belarusian State University, Bobruiskaya street, 11, Minsk 220030, Belarus

  • *alexei.sytov@cern.ch

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Issue

Vol. 20, Iss. 7 — July 2017

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