Dugan, G.

Paper	Title	Page
DYN03	Studies of the Electron-Cloud-Induced Beam Dynamics at CesrTA	60
	G. Dugan, M. Billing, R. Meller, M. Palmer, G. Ramirez, J. Sikora, K. Sonnad, H. Williams Cornell University - CLASSE R. Holtzapple California Polytechnic State University
	This talk will review recent data and simulation results related to electron-cloud induced beam dynamics studies at Cesr-TA.
	Slides
PST03	Methods for Quantitative Interpretation of Retarding Field Analyzer Data	91
	J. Calvey, J. Crittenden, G. Dugan, M. Palmer Cornell University - CLASSE K. Harkay Argonne National Laboratory
	A great deal of Retarding Field Analyzer (RFA) data has been taken as part of the CesrTA program at Cornell. Obtaining a quantitative understanding of this data requires use of cloud simulation programs, as well as a detailed model of the RFA itself. In some cases the RFA can be modeled by postprocessing the output of a simulation codes, and one can obtain “best fit” values for important simulation parameters using a systematic method to improve agreement between data and simulation. In other cases, in particular in high magnetic field regions, the presence of the RFA can have an effect on the cloud, and one needs to include a model of the RFA in the simulation program itself.
PST07	Techniques for Observing Beam Dynamical Effects Caused by the Presence of Electron Clouds	108
	M. Billing, G. Dugan, R. Meller, M. Palmer, G. Ramirez, H. Williams, J. Sikora Cornell University - CLASSE R. Holtzapple California Polytechnic State University
	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 and examples of measurements are presented here.
PST08	Synrad3D Photon Propagation and Scattering Simulation	118
	G. Dugan, D. Sagan Cornell University - CLASSE
	As part of the Bmad software library, a program called Synrad3d has been written to track synchrotron radiation photons generated in storage rings. The purpose of the program is primarily to estimate the intensity and distribution of photon absorption sites, which are critical inputs to codes which model the growth of electron clouds. Synrad3d includes scattering from the vacuum chamber walls using X-ray data from an LBNL database. Synrad3d can handle any planar lattice and a wide variety of vacuum chamber profiles. A description of the program will be given, together with some examples of results.
PST10	Using Coherent Tune Shifts to Evaluate Electron Cloud Effects on Beam Dynamics at CesrTA	130
	D. Kreinick, J. Crittenden, G. Dugan, Z. Leong, M. Palmer Cornell University - CLASSE R. Holtzapple, M. Randazzo California Polytechnic State University M. Furman, M. Venturini LBNL
	One technique used at CesrTA for studying the effects of electron clouds on beam dynamics is to measure electron and positron bunch tunes under a wide variety of beam energies, bunch charge, and bunch train configurations. Comparing the observed tunes with the predictions of various simulation programs allows the evaluation of important parameters in the cloud formation models. These simulations will be used to predict the behavior of the electron cloud in damping rings for future linear colliders.
FTR02	Simulation of Electron Cloud Induced Instabilities and Emittance Growth for CesrTA	203
	M. Pivi SLAC National Accelerator Laboratory G. Dugan, M. Palmer, K. Sonnad Cornell University - CLASSE
	As part of the international Linear Collider (ILC) collaboration, we have compared the electron cloud (EC) effect for different Damping Ring (DR) designs respectively with 6.4 km and 3.2 km circumference and investigated the feasibility of the shorter damping ring with respect to the electron cloud build-up and related beam instabilities. The studies for a 3.2 km ring 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 considerable reduction of the number of components, wiggler magnets and costs. We also present the results for the luminosity upgrade option with shorter 3ns bunch spacing. In particular we will go through the evaluation of mitigation techniques for the ILC DR and discuss the integration of the CesrTA results into the Damping Ring design. Furthermore (with Kiran Sonnad, Cornell) we have performed detailed simulations using the CMAD code for CesrTA single-bunch instability and linear emittance growth below threshold and preliminary comparisons with experimental data are discussed here in view of the validation of the simulation codes prediction for the ILC DR.
	Slides