| Paper |
Title |
Page |
| TUPAN085 |
LHC Impedance Reduction by Nonlinear Collimation
|
1571 |
| |
- J. Resta-Lopez, A. Faus-Golfe
IFIC, Valencia
- F. Zimmermann
CERN, Geneva
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A nonlinear collimation system can allow larger aperture for the mechanical jaws, and it thereby can help to reduce the collimator impedance, which presently limits the LHC beam intensity. Assuming the nominal LHC beam at 7 TeV, we show how a nonlinear betatronic collimation insertion would reduce considerably the LHC coherent tune shift for the most critical coupled-bunch mode as compared with the conventional baseline linear collimation system of Phase-I. In either case, the tune shifts of the most unstable modes are compared with the stability diagrams for Landau damping.
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| THPMN065 |
Laser Collimation for Linear Colliders
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2856 |
| |
- H. Aksakal
Ankara University, Faculty of Sciences, Tandogan/Ankara
- J. Resta-Lopez
IFIC, Valencia
- F. Zimmermann
CERN, Geneva
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| |
We explore the possibility of laser-based postlinac beam collimation in future linear colliders. A laser employed as a spoiler can neither be 'destroyed' by the beam impact and nor generate collimator wake fields. In addition, the postlinac collimation section, presently the longest part of linear-collider beam delivery systems, can be shortened. In this paper, we investigate different types of laser modes for use as spoiler. Suitable laser beam parameters and modes are discussed for collimation in both CLIC and ILC.
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