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A. Amiry

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Last Name: Amiry

Full Name: A. Amiry

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3 papers
title: Study of magnetic lattice for a quasi-isochronous ring
format: journal article
publisher: Particle Accelerators
year: 1994
4 authors: A. Amiry | C. Pellegrini | E. Forest | D. Robin
abstract: Quasi-isochronous rings (QIRs) have been considered for electron-positron colliders to obtain large luminosity with a small average beam current. This approach offers the advantage of minimizing vacuum and RF system problems, and multibunch instability effects. In this paper, we review the basic physics of a QIR, the condition for stable single-particle motion, and the dynamic aperture. The collider we discuss is a Phi( Phi ) factory with a single ring and beam energy of 510 MeV. This ring uses a very strong focusing of the electron and positron beams at the interaction point, i.e., a beta function in the millimeter range; and a momentum compaction variable over a large range, of -0.008 to +0.005, to control the bunch length. It has a luminosity of 10(33) cm(-2) s(-1), average current smaller than 1 A, and a perimeter of 32.7 meter. Its transverse chromaticities and second-order momentum compaction are set to zero by utilizing three families of the sextupoles. The QIR dynamic aperture is calculated using a new computer code, KRAKPOT, written explicitly for small rings.
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title: Status of the variable momentum compaction storage ring experiment in SPEAR
format: conference proceeding
conference: PAC 1993
year: 1993
11 authors: Tran, P. | A. Amiry | C. Pellegrini | Corbett, J. | M. Cornacchia | Lee, M. | Nuhn, H. D. | H. Winick | Wu, D. | Hofmann, A. | D. Robin
abstract: Variable momentum compaction lattices have been proposed for electron-positron colliders and synchrotron radiation sources to control synchrotron tune and bunch length. To address questions of single particle stability limits, a study has been initiated to change the SPEAR lattice into a variable momentum compaction configuration for experimental investigation of the beam dynamics. In this paper, we describe a model-based method used to transform SPEAR from the injection lattice to the low momentum compaction configuration. Experimental observations of the process are reviewed. (12 References).
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title: Quasi-isochronous storage rings
format: journal article
publisher: Physical Review E
year: 1993
4 authors: D. Robin | E. Forest | C. Pellegrini | A. Amiry
abstract: A study is made of the single-particle dynamics of an electron-positron storage ring where the phase-slip factor is made small in order to make the ring nearly isochronous and reduce the bunch length. What is found is that a quasi-isochronous ring makes it possible to obtain a bunch length in the millimeter range, about one order of magnitude shorter than present values. In this study the authors have extended the work of others on isochronous storage rings by quantitatively including higher-order terms in the longitudinal equations of motion. Scaling laws are then derived relating the linear term with the next-highest-order term. These scaling laws, which are derived from a two-dimensional Hamiltonian (one dimension of position and one of momentum), establish criteria for stability. These scaling laws are then checked with full six-dimensional tracking on one particular lattice. (13 References).
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