ICAP 2006 - List of Keywords (impedance)

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impedance

Paper	Title	Other Keywords	Page
MOA2IS01	The ORBIT Simulation Code: Benchmarking and Applications	electron, proton, simulation, space-charge	53
	A. P. Shishlo, S. M. Cousineau, V. V. Danilov, J. Galambos, S. Henderson, J. A. Holmes, M. A. Plum ORNL, Oak Ridge, Tennessee
	Funding: SNS is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U. S. Department of Energy. The contents, structure, implementation, benchmarking, and applications of ORBIT as an accelerator simulation code are described. Physics approaches, algorithms, and limitations for space charge, impedances, and electron cloud effects are discussed. The ORBIT code is a parallel computer code, and the scalabilities of the implementations of parallel algorithms for different physics modules are shown. ORBIT has a long history of benchmarking with analytical exactly solvable problems and experimental data. The results of this benchmarking and the current usage of ORBIT are presented.
	Slides

MOA2IS02	Simulations of Single Bunch Collective Effects Using HEADTAIL	electron, simulation, space-charge, single-bunch	59
	G. Rumolo, E. Métral CERN, Geneva
	The HEADTAIL code is a very versatile tool that can be used for simulations of electron cloud induced instabilities as well as for Transverse Mode Coupling Instability and space charge studies. The effect of electron cloud and/or a conventional impedance (resonator or resistive wall) on a single bunch is modeled using a wake field approach. The code naturally allows either for dedicated studies of one single effect or for more complex studies of the interplay between different effects. Sample results from electron cloud studies (coherent and incoherent effects) and TMCI studies (e.g., for the PS and SPS) will be discussed in detail and compared, where possible, with results from other codes having similar features and/or with existing machine data.
	Slides

TUPPP24	Transverse Coupling Impedance of a Ferrite Kicker Magnet: Comparison between Simulations and Measurements	kicker, coupling, simulation, electromagnetic-fields	128
	E. Arevalo, B. Doliwa, T. Weiland TEMF, Darmstadt
	Funding: This work was partially funded by DIRACsecondary-Beams(RIDS-515873). The driving terms of instabilities in particle accelerators depend on the beam surroundings which are conveniently described by coupling impedances. In the case of critical components, for which analytical calculations are not available, direct measurements of the coupling impedances on a prototype are usually needed. However, this obvious drawback on the design of particle accelerators can be overcome by electromagnetic field simulations within the framework of the Finite Integration Technique. Here we show results from numerical evaluations of the transverse coupling impedance of a ferrite kicker. In order to excite the electromagnetic fields in the device we implement numerically the conventional twin-wire method. A good agreement with experimental measurements is observed, showing a promising way to determine coupling impedances of components of particle accelerators before construction.

WESEPP01	CST's Commercial Beam-Physics Codes	simulation, controls, emittance, electromagnetic-fields	228
	U. Becker CST, Darmstadt
	During the past decades Particle Accelerators have grown to higher and higher complexity and cost, so that a careful analysis and understanding of the machines' behaviour becomes more and more important. CST offers userfriendly numerical simulation tools for the accurate analysis of electromagnetic fields in combination with charged particles, including basic thermal analysis. The CST STUDIO SUITE code family is the direct successor of the code MAFIA, combining the numerical accuracy of the Finite Integration Theory and Perfect Boundary Approximation within an intuitive, easy-to-use CAD environment. Automatic Parameter Sweeping and Optimization are available to achieve and control the design goals. In this paper various solver modules of CST PARTICLE STUDIO, CST EM STUDIO and CST MICROWAVE STUDIO will be presented along accelerator-relevant examples, such as: Cavity design using eigenmode solver including calculation of losses, Q-factors, shunt impedance and thermal analysis. Coupler Design, including external Q-factor Wakefield Simulation, including resistive wall effects, also realized for beams slower than speed of light dispersion diagram for the analysis of periodic structures design of guns, including beam emittance studies study of secondary emission processes and dark current effects in accelerating structures.

WEA3MP04	Implementation and validation of space charge and impedance kicks in the code PATRIC for studies of transverse coherent instabilities in the FAIR rings	space-charge, simulation, dipole, damping	267
	O. Boine-Frankenheim, V. Kornilov GSI, Darmstadt
	Funding: Work supported by EU design study (contract 515873 -DIRACsecondary-Beams) Simulation studies of the transverse stability of the FAIR synchrotrons have been started. The simulation code PATRIC has been developed in order to predict coherent instability thresholds with space charge and different impedance sources. Some examples of code validation using the numerical Schottky noise and analytical stability boundaries will be discussed.
	Slides

WEA4IS02	Numerical Computation of Kicker Impedances: Towards a Complete Database for the GSI SIS100/300 Kickers	kicker, coupling, simulation, extraction	277
	B. Doliwa, T. Weiland TEMF, Darmstadt
	Funding: Work supported by the GSI and the DFG under contract GK 410/3. Fast kicker modules represent a potential source of beam instabilities in the planned Facility for Antiproton and Ion Research (FAIR) at the Gesellschaft für Schwerionenforschung (GSI), Darmstadt. Containing approximately six tons of lossy ferrite material, the more than forty kicker modules to be installed in the SIS-100 and SIS-300 synchrotrons are expected to have a considerable parasitic influence on the high-current beam dynamics. In order to be able to take these effects into account in the kicker design, a dedicated electromagnetic field software for the calculation of coupling impedances has been developed. Here we present our numerical results on the longitudinal and transverse kicker coupling impedances for the planned components and point out ways of optimization. Besides the inductive coupling of the beam to the external network -relevant below 100 MHz- particular attention is paid to the impact of ferrite losses up to the beam-pipe cutoff frequency.
	Slides

THM2IS03	CST's Commercial Beam-Physics Codes	simulation, controls, emittance, electromagnetic-fields	308
	U. Becker CST, Darmstadt
	During the past decades Particle Accelerators have grown to higher and higher complexity and cost, so that a careful analysis and understanding of the machines' behaviour becomes more and more important. CST offers userfriendly numerical simulation tools for the accurate analysis of electromagnetic fields in combination with charged particles, including basic thermal analysis. The CST STUDIO SUITE code family is the direct successor of the code MAFIA, combining the numerical accuracy of the Finite Integration Theory and Perfect Boundary Approximation within an intuitive, easy-to-use CAD environment. Automatic Parameter Sweeping and Optimization are available to achieve and control the design goals. In this paper various solver modules of CST PARTICLE STUDIO, CST EM STUDIO and CST MICROWAVE STUDIO will be presented along accelerator-relevant examples, such as: Cavity design using eigenmode solver including calculation of losses, Q-factors, shunt impedance and thermal analysis. Coupler Design, including external Q-factor Wakefield Simulation, including resistive wall effects, also realized for beams slower than speed of light dispersion diagram for the analysis of periodic structures design of guns, including beam emittance studies study of secondary emission processes and dark current effects in accelerating structures.
	Slides