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hal.structure.identifierCentre d'Etudes Nucléaires de Bordeaux Gradignan [CENBG]
dc.contributor.authorDONOHUE, J.T.
hal.structure.identifierCentre d'études scientifiques et techniques d'Aquitaine [CESTA]
dc.contributor.authorRULLIER, J.L.
dc.date.issued2005
dc.date.conference2004-08-29
dc.description.abstractEnMany years ago Fajans, Kirkpatrick and Bekefi (FKB) studied off-axis orbits in a realistic helical wiggler, both experimentally and theoretically. They found that as the distance from the axis of symmetry to the guiding center increased, both the mean axial velocity and the precession frequency of the guiding center varied. They proposed a clever semi-empirical model which yielded an excellent description of both these variations. We point out that a approximate model proposed by us several years ago can be made to predict these delicate effects correctly, provided we extend our truncated quadratic Hamiltonian to include appropriate cubic and quartic terms. We develop an argument similar to the virial theorem to compare time averaged and fixed-point values of dynamical variables. Illustrative comparisons of our model with numerical calculation are presented.
dc.language.isoen
dc.source.titleProceedings of the 26th International Free Electron Laser Conference
dc.title.enOff-Axis Orbits in Realistic Helical Wigglers: Fixed Points and Time Averaged Dynamical Variables
dc.typeAutre communication scientifique (congrès sans actes - poster - séminaire...)
dc.subject.halPhysique [physics]/Physique [physics]/Physique des accélérateurs [physics.acc-ph]
bordeaux.page30-33
bordeaux.countryIT
bordeaux.title.proceedingProceedings of the 26th International Free Electron Laser Conference
bordeaux.conference.cityTrieste
bordeaux.peerReviewedoui
hal.identifierin2p3-00103057
hal.version1
hal.invitednon
hal.proceedingsoui
hal.conference.end2004-09-03
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//in2p3-00103057v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.btitle=Proceedings%20of%20the%2026th%20International%20Free%20Electron%20Laser%20Conference&rft.date=2005&rft.spage=30-33&rft.epage=30-33&rft.au=DONOHUE,%20J.T.&RULLIER,%20J.L.&rft.genre=conference


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