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EPAC 1996

Name: EPAC 1996

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Date: 1996-01-01

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Created at: Fri Jul 27 23:53:34 -0700 2007

Updated at: Fri Jul 27 23:53:34 -0700 2007

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2 papers from the conference:

title: Measurements of the tune variations induced by non-linearities in lepton machines
format: conference proceeding
conference: EPAC 1996
year: 1997
9 authors: Bartolini, R. | Giovannozzi, M. | Scandale, W. | Verdier, A. | C. Pellegrini | Tran, P. | Todesco, E. | Corbett, J. | M. Cornacchia
abstract: The precise measurement of the betatron tune as a function of the oscillation amplitude provides a useful information on non-linear beam dynamics. In lepton accelerators, this measurement is made difficult due to various damping mechanism. To counteract this, we propose to use algorithms that provide a precise measurement of the tune in a small number of turns. We apply these procedures in LEP at injection and collision energy, as well as in SPEAR at injection energy. Collections of experimental data, and a first comparison with the results of model-based simulations are discussed. (9 References).
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title: Envelope description of quasi-laminar beams undergoing reversible emittance transformations
format: conference proceeding
conference: EPAC 1996
year: 1997
2 authors: L. Serafini | J.B. Rosenzweig
abstract: A fully analytical description is presented for the envelope behavior of intense, space charge dominated beams which are relativistic and quasi-laminar. It is based on a particular solution of the envelope equation for an accelerated beam, which is invariant under reversible emittance transformations: this solution has been termed invariant envelope. The treatment presented in this paper is applicable both to bunched beams in transport lines and in linacs, whenever the beam is space charge dominated. The main interest is in maximizing the beam brightness achievable by Photo-Injectors and preserving the beam quality during the first stages of acceleration. Simple analytical formulae are provided to predict the performances of these devices, when they are operated in the space charge emittance correction regime. (7 References).
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