PAC07 - List of Authors (Latina, A.)

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Latina, A.

Paper	Title	Page
THPMN059	Feedback Studies	2841
	A. Latina G. Rumolo, D. Schulte, R. Tomas CERN, Geneva
	Funding: Supported by the European Community under the 6th Framework Programme "Structuring the European Research Area". Dynamic imperfections in future linear colliders can lead to a significant luminosity loss. We discuss different orbit feedback strategies in the main linac that can mitigate the emittance dilution and compare their efficiency. We also address the impact of ground motion in the beam delivery system and the potential cures.
THPMN061	Bunch Compressor for Beam-Based Alignment	2844
	A. Latina P. Eliasson Uppsala University, Uppsala D. Schulte CERN, Geneva
	Funding: Supported by the European Community under the 6th Framework Programme "Structuring the European Research Area". Misalignments in the main linac of future linear colliders can lead to significant emittance growth. Beam-based alignment algorithms, such as Dispersion Free Steering (DFS), are necessary to mitigate these effects. We study how to use the Bunch Compressor to create the off-energy beams necessary for DFS and discuss the effectiveness of this method.
THPAN068	Wakefield Models for Particle Tracking Codes	3378
	A. Latina R. J. Barlow, A. Bungau UMAN, Manchester G. A. Blair Royal Holloway, University of London, Surrey G. Rumolo, D. Schulte CERN, Geneva J. D.A. Smith Lancaster University, Lancaster
	Wakefields have a considerable effect on beam dynamics and they must not be neglected for emittance growth studies, background estimates and other problems. The codes used for these problems are normally not capable of self-consistent wakefield calculations. They should thus be extended with either analytical models or export the wakefields numerically evaluated with other codes (such as Gdfidl) when analytical models are not feasible. We discuss both approaches and present their implementation in PLACET, MERLIN and BDSIM. The simulation results for the ILC and CLIC beam delivery systems are given as an example. Results produced with different codes are compared.
WEOCC03	Halo Estimates and Simulations for Linear Colliders	2041
	H. Burkhardt I. V. Agapov, G. A. Blair Royal Holloway, University of London, Surrey F. Jackson STFC/DL/ASTeC, Daresbury, Warrington, Cheshire A. Latina, L. Neukermans, D. Schulte CERN, Geneva
	Funding: This work is supported by the Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area", contract number RIDS-011899. Halo simulations and estimates are important for the design of future linear accelerators. We present simulations performed for the ILC and CLIC and compare these with semi-analytical estimates and other simulations.
	Slides
THPMN056	Comparison of ILC Fast Beam-Beam Feedback Performance in the e-e^- and e⁺e^- Modes of Operation	2832
	M. Alabau P. Bambade LAL, Orsay A. Faus-Golfe IFIC, Valencia A. Latina, D. Schulte CERN, Geneva
	Several feedback loops are required in the Beam Delivery System (BDS) of the International Linear Collider (ILC) to preserve the luminosity in the presence of dynamic imperfections. Realistic simulations have been carried out to study the performance of the beam-beam deflection based fast feedback system, for both e⁺e^- and e-e^- modes of operation. The beam-beam effects in the e-e^- collisions make both the luminosity and the deflections more sensitive to offsets at the IP than in the case of the e⁺e^- collisions. This reduces the performance of the feedback system in comparison to the standard e⁺e^- collisions, and may require a different beam parameter optimization.
THPMN058	Beam Dynamics Studies in the CLIC Injector Linac	2838
	A. Ferrari A. Latina, L. Rinolfi, F. Tecker CERN, Geneva
	The CLIC Injector Linac has to accelerate both electron and positron main beams from 200 MeV up to 2.42 GeV prior to their injection into the pre-damping rings. Its 26 accelerating structures operate at 1.875 GHz, with a loaded gradient of 17 MV/m. A FODO lattice that wraps the accelerating structures at the beginning of the linac, followed by a succession of triplet lattices between the accelerating structures, is proposed. The large transverse emittance (9200 mm.mrad), bunch length (5 mm) and energy spread (7 MeV) of the positron beam set constraints on the linac in order to reach acceptable characteristics at 2.42 GeV for the injection into the pre-damping ring. The use of a bunch compressor at the entrance of the linac is an option in order to achieve good performance in both the longitudinal and transverse phase spaces. Tracking studies of both electron and positron beams in the linac have been performed and are presented.
THPMN062	Dynamic Effects During Beam-Based Alignment	2847
	D. Schulte P. Eliasson, A. Latina CERN, Geneva
	Funding: Supported by the European Community under the 6th Framework Programme "Structuring the European Research Area". Complex beam-based alignment procedures are needed in future linear colliders to reduce the negative effects of static imperfections in the main linac on the beam emittance. The efficiency of these procedures could be affected by dynamic imperfections during their application. In this paper we study the resulting emittance growth.
THPMN073	Collimation Optimisation in the Beam Delivery System of the International Linear Collider	2871
	F. Jackson R. J. Barlow, A. M. Toader UMAN, Manchester A. Latina, D. Schulte CERN, Geneva
	The collimation systems of the International Linear Collider (ILC) Beam Delivery System (BDS) must perform efficient removal of halo particles which lie outside the acceptable ranges of energy and spatial spread. An optimisation strategy based on earlier work is applied to the latest version of the BDS lattice. The resulting improvement in collimation performance is studied by halo tracking simulations, and the luminosity performance of the optimised lattice is also examined.
THPMS013	Comparison of Tracking Codes for the International Linear Collider	3020
	J. C. Smith P. Eliasson Uppsala University, Uppsala K. Kubo KEK, Ibaraki A. Latina, D. Schulte CERN, Geneva P. Lebrun, K. Ranjan Fermilab, Batavia, Illinois F. Poirier, N. J. Walker DESY, Hamburg P. Tenenbaum SLAC, Menlo Park, California
	Funding: Supported by the US Department of Energy, the US National Science Foundation and the Commission of the European Communities under the 6th Framework Programme "Structuring the European Research Area". In an effort to compare beam dynamics and create a ‘‘benchmark'' for Dispersion Free Steering (DFS) a comparison was made between different International Linear Collider (ILC) simulation programs while performing DFS. This study consisted of three parts. First, a simple betatron oscillation was tracked through each code. Secondly, a set of component misalignments and corrector settings generated from one program was read into the other to confirm similar emittance dilution. Thirdly, given the same set of component misalignments DFS was performed independently in each program and the resulting emittance dilution was compared. Performance was found to agree exceptionally well in all three studies.
THPMS056	Emittance Preservation in the International Linear Collider Ring to Main Linac Transfer Line	3118
	P. Tenenbaum K. Kubo KEK, Ibaraki A. Latina CERN, Geneva J. C. Smith CLASSE, Ithaca
	Funding: Work supported by the US Department of Energy, contract DE-AC02-76SF00515. The very small vertical beam emittance in the International Linear Collider (ILC) can be degraded by dispersion, xy coupling, transverse wakefields, and time-varying transverse fields introduced by elements with misalignments, strength errors, xy rotation errors, or yz rotation errors in the Ring to Main Linac (RTML) transfer line. We present a plan for emittance preservation in this beamline which uses local, quasi-local, and global correction schemes. Results of simulations of the emittance preservation algorithm are also presented and discussed.