Influence of ground motion on the time evolution of beams in linear colliders

Sery, A.; Napoly, O.

doi:10.1103/physreve.53.5323

Cited by 51 publications

(58 citation statements)

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“…The simplest model may be the so-called ATL model [6,14]. According to this model the variance of the relative (vertical) displacement of two elements equals…”

Section: Ground Motionmentioning

confidence: 99%

Dynamic imperfections and optimized feedback design in the Compact Linear Collider main linac

Eliasson

2008

Phys. Rev. ST Accel. Beams

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The Compact Linear Collider (CLIC) main linac is sensitive to dynamic imperfections such as element jitter, injected beam jitter, and ground motion. These effects cause emittance growth that, in case of ground motion, has to be counteracted by a trajectory feedback system. The feedback system itself will, due to jitter effects and imperfect beam position monitors (BPMs), indirectly cause emittance growth. Fast and accurate simulations of both the direct and indirect effects are desirable, but due to the many elements of the CLIC main linac, simulations may become very time consuming. In this paper, an efficient way of simulating linear (or nearly linear) dynamic effects is described. The method is also shown to facilitate the analytic determination of emittance growth caused by the different dynamic imperfections while using a trajectory feedback system. Emittance growth expressions are derived for quadrupole, accelerating structure, and beam jitter, for ground motion, and for noise in the feedback BPMs. Finally, it is shown how the method can be used to design a feedback system that is optimized for the optics of the machine and the ground motion spectrum of the particular site. This feedback system gives an emittance growth rate that is approximately 10 times lower than that of traditional trajectory feedbacks. The robustness of the optimized feedback system is studied for a number of additional imperfections, e.g., dipole corrector imperfections and faulty knowledge about the machine optics, with promising results.

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“…The simplest model may be the so-called ATL model [6,14]. According to this model the variance of the relative (vertical) displacement of two elements equals…”

Section: Ground Motionmentioning

confidence: 99%

Dynamic imperfections and optimized feedback design in the Compact Linear Collider main linac

Eliasson

2008

Phys. Rev. ST Accel. Beams

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“…[2], and detailed studies with intensive computer simulations are described in Refs. [3,4,5]. The purpose of this paper is to develop a simple model based on a FODO lattice approximation for the linac which allows an analytic calculation of the emittance dilution.…”

Section: Introductionmentioning

confidence: 99%

Quadrupole Misalignments and Steering in Long Linacs

Stupakov¹

2000

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We present a study of orbit jitter and emittance growth in a long linac caused by misalignment of quadrupoles. First, assuming a FODO lattice, we derive analytical formulae for the RMS deviation of the orbit and the emittance growth caused by random uncorrelated misalignments of all quadrupoles. We then consider an alignment algorithm based on minimization of BPM readings with a given BPM resolution and finite mover steps.

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“…As measurements at different geographical locations show, the power spectrum P tot (ω) of ground motion at a single point can be roughly approximated as [3] …”

Section: The Simulation Modelmentioning

confidence: 99%

“…According to the AT L rule [4], the power spectrum ρ(ω, L) of the uncorrelated motion of two points at a distance L is [3] …”

Section: The Simulation Modelmentioning

confidence: 99%