Section Navigation

Browse



logged in as: pbpl
logout
list users
D. Robin

First Name: D

Middle Name:

Last Name: Robin

Full Name: D. Robin

24-tag-hot tags:


view citation format

11 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.
keywords:
Download | Details | Edit | Delete
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).
keywords:
Download | Details | Edit | Delete
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).
keywords:
Download | Details | Edit | Delete
title: Quasi-isochronous ring flavor factories
format: conference proceeding
conference: Conference on Rare and Exclusive B & K Decays and Novel Flavor Factories
year: 1992
2 authors: C. Pellegrini | D. Robin
abstract: The authors study the single particle and collective dynamics of a storage ring where the momentum compaction is made small to make the ring nearly isochronous and reduce the bunch length and increase the peak current. They find that a quasi-isochronous ring makes it possible to obtain a bunch length in the millimeter range, about one order of magnitude shorter than the present values, and to increase the beam longitudinal brillance by more than one order of magnitude. The shorter bunch length allows one to reduce the betatron function and the beam area at the interaction point of an electron-positron collider, leading to larger luminosity. They also design a ring whose momentum compaction can be varied over several orders of magnitude. (17 References).
keywords:
Details | Edit | Delete
title: Electron density enhancement in a quasi isochronous storage ring
format: conference proceeding
conference: PAC 1991
year: 1991
2 authors: C. Pellegrini | D. Robin
abstract: Conditions are established for stable single particle motion in a storage ring with very small momentum compaction, and very short bunch length, the quasi isochronous ring. How this condition can be achieved is discussed. Applications of this condition to colliders and synchrotron radiation sources is examined. (2 References).
keywords:
Download | Details | Edit | Delete
title: Quasi-isochronous storage ring
format: journal article
publisher: Nuclear Instruments & Methods A
year: 1991
2 authors: C. Pellegrini | D. Robin
abstract: The authors study the single particle and collective dynamics of a storage ring where the momentum compaction is made small to make it nearly isochronous, to reduce the bunch length and increase the peak current. They find that a quasi-isochronous ring makes it possible to obtain a bunch length in the millimeter range and to increase the beam longitudinal brilliance by more than one order of magnitude. (16 References).
keywords:
Download | Details | Edit | Delete
title: Isochronous storage-rings and high-luminosity electron-positron colliders
format: journal article
publisher: Annals of the NY Academy of Sciences
year: 1991
2 authors: C. Pellegrini | D. Robin
abstract:
keywords:
Download | Details | Edit | Delete
title: A high luminosity superconducting mini collider for phi meson production and particle beam physics
format: conference proceeding
conference: PAC 1991
year: 1991
14 authors: C. Pellegrini | D. Robin | D. B. Cline | J. Kolonko | S. Anderson | W. Barletta | Chargin, A. | M. Cornacchia | Dalbacka, G. | K. Halbach | Lueng, E. | Kimball, F. | Madura, D. | Patterson, L.
abstract: A 510-MeV electron-positron collider has been proposed at the University of California at Los Angeles to study particle beam physics and phi-meson physics at luminosities larger than 1032 cm/sup -2/s/sup -1/. The collider consists of a single compact superconducting storage ring (SMC), with a bending field of 4 T and a current larger than 1 A. A discussion is presented of the main characteristics of this system and its major technical components: superconducting dipoles and the RF vacuum and injection systems. (6 References).
keywords:
Download | Details | Edit | Delete
title: Conceptual Design of a High Luminosity 510 MeV Collider
format: conference proceeding
conference: PAC 1991
year: 1991
3 authors: C. Pellegrini | M. Cornacchia | D. Robin
abstract: We discuss the magnetic lattice design of a high luminosity 510 MeV electron-positron collider, based on high field superconduction bending dipoles. The design criteria are flexibility in the choice of the tune and beta functions at the interaction point, horizontal emittance larger than 1 mm mrad to produce a luminosity larger than 10(32) cm(-2)s(-1), large synchrotron radiation damping rate, and large momentum compaction. The RF system parameter are chosen to provide a short bunch length also when the beam energy spread is determined by the microwave instability. A satisfactory ring dynamic aperture, and a simultaneous small value of the horizontal and vertical beta function at the interaction point, we expect will be achieved by using Cornacchia Halbach modified sextupoles.
keywords:
Download | Details | Edit | Delete
title: Quasi-isochronous storage ring: a novel concept for high luminosity lepton colliders
format: conference proceeding
conference: Present and Future of Collider Physics: Conference in Honour of Giorgio Salvini's 70th Birthday
year: 1991
2 authors: C. Pellegrini | D. Robin
abstract: The authors study the single particle and collective dynamics of a storage ring where the momentum compaction is made small to make the ring nearly isochronous and reduce the bunch length and increase the peak current. They find that a quasi-isochronous ring makes it possible to obtain a bunch length in the millimeter range, about one order of magnitude shorter than the present values, and to increase the beam longitudinal brilliance by more than one order of magnitude. The shorter bunch length allows one to reduce the betatron function and the beam area at the interaction point of an electron-positron collider, leading to larger luminosity. (16 References).
keywords:
Details | Edit | Delete
title: Isochronous storage rings and high luminosity electron-positron colliders
format: conference proceeding
conference: Conference on Beam Dynamics Issues of High-Luminosity Asymmetric Collider Rings
year: 1990
2 authors: C. Pellegrini | D. Robin
abstract: The interest in studying CP and possibly CPT violations in B and phi meson decay has lead recently to several proposals for the construction of B and phi factories. With a conventional storage ring collider, high luminosity 10 to 100 times larger than maximum obtained up to now, is obtained by increasing the stored electron and positron beam currents from the 10-100 mA range to the several Ampere level. This very large beam current raises questions of collective instabilities and vacuum and RF system design. In addition the RF power needed to compensate the synchrotron radiation losses is of the order of 5 to 10 MW. The authors study the possibility of obtaining this high luminosity keeping the beam current at the 100 mA level, by using an 'isochronous ring' and reducing the bunch length and the beta function at the interaction point. (7 References).
keywords:
Download | Details | Edit | Delete