| Paper |
Title |
Page |
| MOPLS094 |
Luminosity Tuning at the Interaction Point
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774 |
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- P. Eliasson, M. Korostelev, D. Schulte, R. Tomas, F. Zimmermann
CERN, Geneva
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Minimisation of the emittance in a linear collider is not enough to achieve optimal performance. For optimisation of the luminosity, tuning of collision parameters such as angle, offset, waist, etc. is needed, and a fast and reliable tuning signal is required. In this paper tuning knobs are presented, and their optimisation using beamstrahlung as a tuning signal is studied.
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| MOPLS134 |
Minimizing Emittance for the CLIC Damping Ring
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870 |
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- H.-H. Braun, M. Korostelev, D. Schulte, F. Zimmermann
CERN, Geneva
- E.B. Levitchev, P.A. Piminov, S.V. Sinyatkin, P. Vobly, K. Zolotarev
BINP SB RAS, Novosibirsk
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The CLIC damping rings aim at unprecedented small normalized equilibrium emittances of 3.3 nm vertical and 550 nm horizontal, for a bunch charge of 2.6 109 particles and an energy of 2.4 GeV. In this parameter regime the dominant emittance growth mechanism is intra-beam scattering. Intense synchrotron radiation damping from wigglers is required to counteract its effect. Here the overall optimization of the wiggler parameters is described, taking into account state-of-the-art wiggler technologies, wiggler effects on dynamic aperture, and problems of wiggler radiation absorption. Two technical solutions, one based on superconducting magnet technology and the other on permanent magnets, are presented. Although dynamic aperture and tolerances of this ring design remain challenging, benefits are obtained from the strong damping. Only bunches for a single machine pulse need to be stored, making injection/extraction particularly simple and limiting the synchrotron-radiation power. With a 360 m circumference, the ring remains comparatively small.
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| MOPLS135 |
Correction of Vertical Dispersion and Betatron Coupling for the CLIC Damping Ring
|
873 |
| |
- M. Korostelev, F. Zimmermann
CERN, Geneva
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The sensitivity of the CLIC damping ring to various kinds of alignment errors have been studied. Without any correction, fairly small vertical misalignments of the quadrupoles and, in particular, the sextupoles, introduce unacceptable distortions of the closed orbit as well as intolerable spurious vertical dispersion and coupling due to the strong focusing optics of the damping ring. A sophisticated beam-based correction scheme has been developed to bring the design target emittances and the dynamic aperture back to the ideal value. The correction using dipolar correctors and several skew quadrupole correctors allows a minimization of the closed-orbit distortion, the cross-talk between vertical and horizontal closed orbits, the residual vertical dispersion and the betatron coupling.
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| WEPLS060 |
CLIC Polarized Positron Source Based on Laser Compton Scattering
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2520 |
| |
- F. Zimmermann, H.-H. Braun, M. Korostelev, L. Rinolfi, D. Schulte
CERN, Geneva
- S. Araki, Y. Higashi, Y. Honda, Y. Kurihara, M. Kuriki, T. Okugi, T. Omori, T. Taniguchi, N. Terunuma, J. Urakawa
KEK, Ibaraki
- X. Artru, R. Chehab, M. Chevallier
IN2P3 IPNL, Villeurbanne
- E.V. Bulyak, P. Gladkikh
NSC/KIPT, Kharkov
- M.K. Fukuda, K. Hirano, M. Takano
NIRS, Chiba-shi
- J. Gao
IHEP Beijing, Beijing
- S. Guiducci, P. Raimondi
INFN/LNF, Frascati (Roma)
- T. Hirose, K. Sakaue, M. Washio
RISE, Tokyo
- K. Moenig
DESY Zeuthen, Zeuthen
- H.D. Sato
HU/AdSM, Higashi-Hiroshima
- V. Soskov
LPI, Moscow
- V.M. Strakhovenko
BINP SB RAS, Novosibirsk
- T. Takahashi
Hiroshima University, Higashi-Hiroshima
- A. Tsunemi
SHI, Tokyo
- V. Variola, Z.F. Zomer
LAL, Orsay
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We describe the possible layout and parameters of a polarized positron source for CLIC, where the positrons are produced from polarized gamma rays created by Compton scattering of a 1.3-GeV electron beam off a YAG laser. This scheme is very energy effective using high finesse laser cavities in conjunction with an electron storage ring. We point out the differences with respect to a similar system proposed for the ILC.
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