Paper | Title | Other Keywords | Page |
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MOP067 | High Gradient Excitation and RF Power Generation Using Dielectric Loaded Wakefield Structures | electron, gun, klystron, laser | 232 |
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Funding: Work supported by the U.S. Department of Energy under contract No. DE-AC02-06CH11357. |
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MOP068 | Trains of Sub-Picosecond Electron Bunches for High-Gradient Plasma Wakefield Acceleration | plasma, electron, emittance, simulation | 235 |
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Funding: Work Supported by US Department of Energy *P. Muggli et al., to appear in Phys. Rev. Lett. (2008). |
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MOP087 | Status of Longitudinal Beam Dynamics Studies in CTF3 | simulation, electron, space-charge, cavity | 278 |
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The aim of the CLIC Test Facility CTF3, built at CERN by an international collaboration, is to address the main feasibility issues of the CLIC electron-positron linear collider technology by 2010. One key-issue studied in CTF3 is the generation of the very high current drive beam, used in CLIC as the rf power source. It is particularly important to simulate and control the drive beam longitudinal dynamics in the drive beam generation complex, since it directly affects the efficiency and stability of the rf power production process. In this paper we describe the ongoing effort in modelling the longitudinal evolution of the CTF3 drive beam and compare the simulations with experimental results. |
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MOP089 | Beam Dynamics and Wake-field Simulations for High Gradient ILC Linacs | cavity, simulation, linac, emittance | 284 |
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Higher order modes (HOMs) are simulated with finite element and finite difference computer codes for the ILC superconducting cavities currently under investigation for the ILC. In particular, HOMs in KEK's Ichiro type of cavity and Cornel University's Re-entrant design are focussed on in this work. The aim, at these Universities and laboratories, is to achieve an accelerating gradient in excess of 50 MV/m in 9-cell superconducting cavities whilst maintaining a high quality and stable electron beam. At these high gradients, electrical breakdown is an important cause for concern and the wakefields excited by the energetic electron beams are also potentially damaging to the beam's emittance. Here we restrict the analysis to performing detailed simulations, on emittance dilution due to beams initially injected with realistic offsets from the electrical centre of the cavities and due to statistical misalignments of the cavities. We take advantage of the latest beam dynamics codes in order to perform these simulations. |
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MOP104 | Parallel 3D Finite Element Particle-In-Cell Code for High-Fidelity RF Gun Simulations | simulation, gun, space-charge, emittance | 317 |
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Funding: Work supported by DOE contract DE-AC02-76SF00515. |
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MOP105 | Beam Dynamics and Wake-field Simulations for the CLIC Main Linacs | emittance, cavity, damping, linac | 320 |
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The CLIC linear collider aims at accelerating multiple bunches of electrons and positrons and colliding them at a center of mass energy of 3 TeV. These bunches are accelerated through X-band linacs operating at an accelerating frequency of 12 GHz. Each beam readily excites wake-fields in the accelerating cavities of each linac. The transverse components of the wake-fields, if left unchecked, can dilute the beam emittance. The present CLIC design relies on heavy damping of these wake-fields in order to ameliorate the effects of the wake-fields on the beam emittance. Here we present initial results on simulations of the long-range wakefields in these structures and on beam dynamics simulations. In particular, detailed simulations are performed, on emittance dilution due to beams initially injected with realistic offsets from the electrical centre of the cavities and due to statistical misalignments of the cavities. |
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TU302 | Control, Stability and Staging in Laser Wakefield Accelerators | laser, controls, linac, plasma | 379 |
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Laser driven plasma wakefields have recently accelerated electron beams with quasi-monoenergetic energy distributions and with gradients of ~100 GV/m. Stabilization and optimization of beam quality are now essential. Recent LBNL experiments have demonstrated control of self trapping, resulting in reproducible bunches at 0.5 GeV. Further optimization has been demonstrated using plasma density gradients to control trapping, producing beams with very low absolute momentum spread at low energies. Simulations indicate that use of these beams as an injector greatly improves accelerator performance and experiments are now underway to demonstrate such staging, which will be a crucial technology for laser driven linacs. This talk will cover recent progress in LWFAs to obtain more reproducible, higher quality beams and also cover staging prospects for high energy laser linacs. |
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TUP050 | Design and Optimization of Electron Bunch Acceleration and Compression | electron, linac, acceleration, cavity | 512 |
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Funding: The work of PE and JW was supported by the US Department of Energy under contract DE-AC02-76SF00515. The work of RAB and KJK was supported by National Science Foundation Award No. DMR-0537588. |
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TUP055 | Optimum Frequency and Gradient for the CLIC Main Linac Accelerating Structure | linac, luminosity, collider, accelerating-gradient | 527 |
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Recently the CLIC study has changed the operating frequency and accelerating gradient of the main linac from 30 GHz and 150 MV/m to 12 GHz and 100 MV/m, respectively. This major change of parameters has been driven by the results from a novel main linac optimization procedure. The procedure allows simultaneous optimization of operating frequency, accelerating gradient, and many other parameters of CLIC main linac. It takes into account both beam dynamics (BD) and high power rf constraints. BD constraints are related to emittance growth due to short- and long-range transverse wakefields. Rf constraints are related to rf breakdown and pulsed surface heating of the accelerating structure. The optimization figure of merit includes the power efficiency, measured as a ratio of luminosity to the input power as well as a quantity proportional to investment cost. |
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TUP057 | Design and Fabrication of CLIC Test Structures | damping, HOM, accelerating-gradient, impedance | 533 |
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Demonstration of a gradient of 100 MV/m at a breakdown rate of 10-7 is one of the key feasibility issues of the CLIC project. A high power rf test program both at X-band (SLAC and KEK) and 30 GHz (CERN) is under way to develop accelerating structures reaching this performance. The test program includes the comparison of structures with different rf parameters, with/without wakefield damping waveguides, and different fabrication technologies namely quadrant bars and stacked disks. The design and objectives of the various X-band and 30 GHz structures are presented and their fabrication methods and status is reviewed. |
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TUP107 | Longitudinal Beam Diagnostics for the ILC Injectors and Bunch Compressors | diagnostics, luminosity, emittance, bunching | 655 |
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Funding: Work supported by US. Department of Energy, under Contract No. DE-FG02-06ER41435 with Northern Illinois University. |
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THP038 | A New SRF Cavity Shape with Minimized Surface Electric and Magnetic Fields for the ILC | cavity, HOM, dipole, coupling | 867 |
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Funding: Work supported by DOE contract DE-AC02-76SF00515. |
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THP074 | A New Accelerator Structure Concept: the Zipper Structure | coupling, HOM, damping, resonance | 963 |
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Funding: Work supported by the U.S. Department of Energy under contract DE-AC02-76SF00515. |