Design of beam optics for the future circular collider e+e- collider rings

被引：52

作者：

Oide, K. ^{[1
]}

Aiba, M. ^{[2
]}

Aumon, S. ^{[2
]}

Benedikt, M. ^{[2
]}

Blondel, A. ^{[3
]}

Bogomyagkov, A. ^{[4
]}

Boscolo, M. ^{[5
]}

Burkhardt, H. ^{[2
]}

Cai, Y. ^{[6
]}

Doblhammer, A. ^{[2
]}

Haerer, B. ^{[2
]}

Holzer, B. ^{[2
]}

Jowett, J. M. ^{[2
]}

Koop, I. ^{[4
]}

Koratzinos, M. ^{[3
]}

Levichev, E. ^{[4
]}

Medina, L. ^{[2
]}

Ohmi, K. ^{[1
]}

Papaphilippou, Y. ^{[2
]}

Piminov, P. ^{[4
]}

Shatilov, D. ^{[4
]}

Sinyatkin, S. ^{[6
]}

Sullivan, M. ^{[6
]}

Wenninger, J. ^{[2
]}

Wienands, U. ^{[7
]}

Zhou, D. ^{[1
]}

Zimmermann, F. ^{[2
]}

机构：

[1] KEK, Tsukuba, Ibaraki 3050801, Japan

[2] PSI, CH-5232 Villigen, Switzerland

[3] Univ Geneva, DPNC, CH-1211 Geneva 4, Switzerland

[4] BINP SB RAS, Novosibirsk 630090, Russia

[5] Ist Nazl Fis Nucl, LNF, I-00044 Rome, Italy

[6] SLAC, Menlo Pk, CA 94025 USA

[7] ANL, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW ACCELERATORS AND BEAMS | 2016年 / 19卷 / 11期

关键词：

D O I：

10.1103/PhysRevAccelBeams.19.111005

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

A beam optics scheme has been designed for the future circular collider-e(+) e(-) (FCC-ee). The main characteristics of the design are: beam energy 45 to 175 GeV, 100 km circumference with two interaction points (IPs) per ring, horizontal crossing angle of 30 mrad at the IP and the crab-waist scheme [P. Raimondi, D. Shatilov, and M. Zobov, arXiv: physics/0702033; P. Raimondi, M. Zobov, and D. Shatilov, in Proceedings of the 22nd Particle Accelerator Conference, PAC-2007, Albuquerque, NM (IEEE, New York, 2007), p. TUPAN037.] with local chromaticity correction. The crab-waist scheme is implemented within the local chromaticity correction system without additional sextupoles, by reducing the strength of one of the two sextupoles for vertical chromatic correction at each side of the IP. So-called "tapering" of the magnets is applied, which scales all fields of the magnets according to the local beam energy to compensate for the effect of synchrotron radiation (SR) loss along the ring. An asymmetric layout near the interaction region reduces the critical energy of SR photons on the incoming side of the IP to values below 100 keV, while matching the geometry to the beam line of the FCC proton collider (FCC-hh) [A. Chance et al., Proceedings of IPAC'16, 9-13 May 2016, Busan, Korea, TUPMW020 (2016).] as closely as possible. Sufficient transverse/longitudinal dynamic aperture (DA) has been obtained, including major dynamical effects, to assure an adequate beam lifetime in the presence of beamstrahlung and top-up injection. In particular, a momentum acceptance larger than +/- 2% has been obtained, which is better than the momentum acceptance of typical collider rings by about a factor of 2. The effects of the detector solenoids including their compensation elements are taken into account as well as synchrotron radiation in all magnets. The optics presented in this paper is a step toward a full conceptual design for the collider. A number of issues have been identified for further study.

引用

页数：11

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