IPAC'10 - List of Authors (Dugan, G.)

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Dugan, G.

Paper	Title	Page
MOPE091	Techniques for Observation of Beam Dynamics in the Presence of an Electron Cloud	1197
	M.G. Billing, G. Dugan, R.E. Meller, M.A. Palmer, M.C. Rendina, N.T. Rider, J.P. Sikora, C.R. Strohman CLASSE, Ithaca, New York R. Holtzapple CalPoly, San Luis Obispo, CA
	During the last several years CESR has been studying the effects of electron clouds on stored beams in order to understand their impact on future linear-collider damping ring designs. One of the important issues is the way that the electron cloud alters the dynamics of bunches within the train. Techniques for observing the dynamical effects of beams interacting with the electron clouds have been developed. These methods will be discussed and examples of measurements will be presented.
TUPD022	CesrTA Retarding Field Analyzer Modeling Results	1970
	J.R. Calvey, J.A. Crittenden, G. Dugan, S. Greenwald, Z. Leong, J.A. Livezey, M.A. Palmer CLASSE, Ithaca, New York C.M. Celata Cornell University, Ithaca, New York M.A. Furman, M. Venturini LBNL, Berkeley, California K.C. Harkay ANL, Argonne
	Retarding field analyzers (RFAs) provide an effective measure of the local electron cloud density and energy distribution. Proper interpretation of RFA data can yield information about the behavior of the cloud, as well as the surface properties of the instrumented vacuum chamber. However, due to the complex interaction of the cloud with the RFA, particularly in regions of high magnetic field, understanding these measurements can be nontrivial. This paper will examine different methods for interpreting RFA data via cloud simulation programs. Possible techniques include postprocessing the output of a simulation code to predict the RFA response, and incorporating an RFA model into the program itself.
TUPD024	Progress in Studies of Electron-cloud-induced Optics Distortions at CesrTA	1976
	J.A. Crittenden, J.R. Calvey, G. Dugan, D.L. Kreinick, Z. Leong, J.A. Livezey, M.A. Palmer, D. L. Rubin, D. Sagan CLASSE, Ithaca, New York M.A. Furman, G. Penn, M. Venturini LBNL, Berkeley, California K.C. Harkay ANL, Argonne R. Holtzapple CalPoly, San Luis Obispo, CA M.T.F. Pivi, L. Wang SLAC, Menlo Park, California
	The Cornell Electron Storage Ring Test Accelerator (CesrTA) program has included extensive measurements of coherent tune shifts for a variety of electron and positron beam energies, bunch current levels, and bunch train configurations. The tune shifts have been shown to result primarily from the interaction of the beam with the space-charge field of the beam-induced low-energy electron cloud in the vacuum chamber. Comparison to several advanced electron cloud simulation program packages has allowed determination of the sensitivity of these measurements to physical parameters such as the synchrotron radiation flux, its interaction with the vacuum chamber wall, the beam emittance and lattice optics, as well as to those of the various contributions to the electron secondary yield model. We report on progress in understanding the cloud buildup and decay mechanisms in magnetic fields and in field-free regions, addressing quantitatively the precise determination of the physical parameters of the modelling. Validation of these models will serve as essential input in the design of damping rings for future high-energy linear colliders.
TUYMH02	Electron Cloud at Low Emittance in CesrTA	1251
	M.A. Palmer, J.P. Alexander, M.G. Billing, J.R. Calvey, C.J. Conolly, J.A. Crittenden, J. Dobbins, G. Dugan, N. Eggert, E. Fontes, M.J. Forster, R.E. Gallagher, S.W. Gray, S. Greenwald, D.L. Hartill, W.H. Hopkins, D.L. Kreinick, B. Kreis, Z. Leong, Y. Li, X. Liu, J.A. Livezey, A. Lyndaker, J. Makita, M.P. McDonald, V. Medjidzade, R.E. Meller, T.I. O'Connell, S.B. Peck, D.P. Peterson, G. Ramirez, M.C. Rendina, P. Revesz, D.H. Rice, N.T. Rider, D. L. Rubin, D. Sagan, J.J. Savino, R.M. Schwartz, R.D. Seeley, J.W. Sexton, J.P. Shanks, J.P. Sikora, E.N. Smith, C.R. Strohman, H.A. Williams CLASSE, Ithaca, New York F. Antoniou, S. Calatroni, M. Gasior, O.R. Jones, Y. Papaphilippou, J. Pfingstner, G. Rumolo, H. Schmickler, M. Taborelli CERN, Geneva D. Asner Carleton University, College of Natural Sciences, Ottawa, Ontario L. Boon, A.F. Garfinkel Purdue University, West Lafayette, Indiana J.M. Byrd, C.M. Celata, J.N. Corlett, S. De Santis, M.A. Furman, A. Jackson, R. Kraft, D.V. Munson, G. Penn, D.W. Plate, M. Venturini LBNL, Berkeley, California B.T. Carlson Grove City College, Grove City, Pennsylvania T. Demma INFN/LNF, Frascati (Roma) R.T. Dowd ASCo, Clayton, Victoria J.W. Flanagan, P. Jain, K. Kanazawa, K. Kubo, K. Ohmi, H. Sakai, K. Shibata, Y. Suetsugu, M. Tobiyama KEK, Ibaraki D. Gonnella Clarkson University, Potsdam, New York W. Guo BNL, Upton, Long Island, New York K.C. Harkay ANL, Argonne R. Holtzapple CalPoly, San Luis Obispo, CA J.K. Jones, A. Wolski Cockcroft Institute, Warrington, Cheshire D. Kharakh, J.S.T. Ng, M.T.F. Pivi, L. Wang SLAC, Menlo Park, California M.C. Ross, C.-Y. Tan, R.M. Zwaska Fermilab, Batavia L. Schächter Technion, Haifa E.L. Wilkinson Loyola University, Chicago, Illinois
	The Cornell Electron Storage Ring (CESR) has been reconfigured as a test accelerator (CesrTA) for a program of electron cloud (EC) research at ultra low emittance. The instrumentation in the ring has been upgraded with local diagnostics for measurement of cloud density and with improved beam diagnostics for the characterization of both the low emittance performance and the beam dynamics of high intensity bunch trains interacting with the cloud. Finally a range of EC mitigation methods have been deployed and tested. Measurements of cloud density and its impact on the beam under a range of conditions will be presented and compared with simulations. The effectiveness of a range of mitigation techniques will also be discussed.
	Slides
WEPE097	Recommendation for the Feasibility of More Compact LC Damping Rings	3578
	M.T.F. Pivi, L. Wang SLAC, Menlo Park, California C.M. Celata, M.A. Furman, M. Venturini LBNL, Berkeley, California J.A. Crittenden, G. Dugan, M.A. Palmer CLASSE, Ithaca, New York T. Demma, S. Guiducci INFN/LNF, Frascati (Roma) K.C. Harkay ANL, Argonne O.B. Malyshev Cockcroft Institute, Warrington, Cheshire K. Ohmi, K. Shibata, Y. Suetsugu KEK, Ibaraki Y. Papaphilippou, G. Rumolo CERN, Geneva
	As part of the International Linear Collider (ILC) collaboration, we have compared the electron cloud effect for different Damping Ring designs respectively with 6.4 km and 3.2 km circumference and investigated the feasibility of a shorter damping ring with respect to the electron cloud build-up and related beam instability. These studies were carried out with beam parameters of the ILC Low Power option. A reduced damping ring circumference has been proposed for the new ILC baseline design and would allow to considerably reduce the number of components, wiggler magnets and costs. We also briefly discuss the plans for future studies including the luminosity upgrade option with shorter bunch spacing, the evaluation of mitigations and the integration of the CesrTA results into the Damping Ring design.