A Diagnostic for Dynamic Aperture

Morton, P.; Pellegrin, J.-L.; Raubenheimer, T.O.; Rivkin, L.; Ross, M.; Ruth, Relinda; Spence, W.L.

doi:10.1109/tns.1985.4333889

Cited by 12 publications

(4 citation statements)

References 1 publication

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“…Once the major gradient errors are eliminated and larger single-bunch currents can be stored, harmonic analysis of turn-by-turn betatron oscillations over hundreds or thousands of turns gives the relative betatron functions and phases at the BPMs ( P b and qjb in equation 2). The first such work was performed at SSRL [4], [5], and was a direct development of previous work using network analyzers (see, for example [6]).…”

Section: A First Turns At Apsmentioning

confidence: 99%

A review of methods for experimentally determining linear optics in storage rings

Safranek

1996

Review of Scientific Instruments

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P r e s e n t e d a t Synchrotron R a d i a t i o n I n s t r u m e n t a t i o n 1995In order to maximize the brightness and provide sufficient dynamic aperture in synchrotron radiation storage rings, one must understand and control the linear optics. Control of the horizontal beta function and dispersion is important for minimizing the horizontal beam size. Control of the skew gradient distribution is important for minimizing the vertical size. In this paper, various methods for experimentally determining the optics in a storage ring will be reviewed. Recent work at the National Synchrotron Light Source X-Ray Ring will be presented as well as work done at laboratories worldwide.

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Section: A First Turns At Apsmentioning

confidence: 99%

A review of methods for experimentally determining linear optics in storage rings

Safranek

1996

Review of Scientific Instruments

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“…Two types of measurements are needed, namely phase space measurement and beam profile measurement during the various stages of the beam capture. The first one requires a multi-turn measurement of the beam position using two beam position monitors 90 • apart in phase space [8]. A new acquisition system, based on a fast digitiser, was developed [9,10].…”

Section: Machine and Instrumentation Modificationsmentioning

confidence: 99%

Adiabatic beam trapping in stable islands of transverse phase space: measurement results at CERN Proton Synchrotron

Cappi

Giovannozzi

Martini

et al.

Proceedings of the 2003 Bipolar/BiCMOS Circuits and Technology Meeting (IEEE Cat. No.03CH37440)

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Recently a novel approach to the problem of multi-turn extraction was proposed. It consists of splitting the beam by adiabatic capture inside stable islands created in the transverse phase space by sextupoles and octupoles. Numerical simulations indicate that such a technique should be feasible and potentially superior to the method presently used at the CERN Proton Synchrotron. During 2002, intense efforts were devoted to the experimental verification of this newly proposed extraction mode. Finally, beam capture into the islands was observed. In this paper, the extraction principle is briefly reviewed and the experimental results are presented and discussed in detail. EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH CERN -AB Division AbstractRecently a novel approach to the problem of multi-turn extraction was proposed. It consists of splitting the beam by adiabatic capture inside stable islands created in the transverse phase space by sextupoles and octupoles. Numerical simulations indicate that such a technique should be feasible and potentially superior to the method presently used at the CERN Proton Synchrotron. During 2002, intense efforts were devoted to the experimental verification of this newly proposed extraction mode. Finally, beam capture into the islands was observed. In this paper, the extraction principle is briefly reviewed and the experimental results are presented and discussed in detail.

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“…According to (1), we need to reduce either the resonance driving term f == 2V2A 3 or nonlinearity a to open the dynamic aperture. We have verified each of these ways as well as combined both of them.…”

Section: Dynamic Aperture Increasementioning

confidence: 99%

Dynamic aperture study at the VEPP-4M storage ring

Киселев¹,

Levichev²,

Sajaev³

et al.

Proceedings of the 1997 Particle Accelerator Conference (Cat. No.97CH36167)

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Dynamic aperture has been studied experimentally at the VEPP-4M electron-positron collider. A transverse bunch motion was excited by fast kickers. The beam intensity and the amplitude of the coherent oscillations were measured turn-by-turn by the BPM. In this paper the technique of determining the dynamic/physical aperture is described. Several methods of increasing the dynamic aperture are discussed. The results of computer simulation and simple model analytic prediction explaining the experimental data are presented.

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A Diagnostic for Dynamic Aperture

Cited by 12 publications

References 1 publication

A review of methods for experimentally determining linear optics in storage rings

A review of methods for experimentally determining linear optics in storage rings

Adiabatic beam trapping in stable islands of transverse phase space: measurement results at CERN Proton Synchrotron

Dynamic aperture study at the VEPP-4M storage ring

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