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| MOMPMP02 |
Computational Needs for the ILC
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luminosity, simulation, emittance, feedback |
7 |
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- D. Schulte
CERN, Geneva
- K. Kubo
KEK, Ibaraki
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Funding: This work is supported by the Commission of the European Communities under the 6th Framework Programme, contract number RIDS-011899.
The ILC requires detailed studies of the beam transport and of individual components of the transport system. The main challenges are the generation and preservation of the low emittance beams, the protection of the machine from excessive beam loss and the provision of good experimental conditions. The studies of these effects leads to specifications for the different accelerator components and hence can significantly impact the cost.
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Slides
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| TUPPP09 |
Modeling High-Current Instabilities in Particle Accelerators
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simulation, radiation, storage-ring, beam-transport |
110 |
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- M. Migliorati, A. Schiavi
Rome University La Sapienza, Roma
- G. Dattoli
ENEA C. R. Frascati, Frascati (Roma)
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Funding: This work has been partially supported by the EU commission in the sixth framework programme, contract no. 011935 EUROFEL
Methods employing integration techniques of Lie algebraic nature have been successfully employed in the past to develop charged beam transport codes, for different types of accelerators. These methods have been so far applied to the transverse motion dynamics, while the longitudinal part has been treated using standard tracking codes. In this contribution we extend the simplectic technique to the analysis of longitudinal and coupled longitudinal and transverse motion in charged beam transport with the inclusion of the non linear dynamics due to the wake field effects. We use the method to model different types of instabilities due to high current. We consider in particular the case of coherent synchrotron instabilities and its implication in the design and performances of high current accelerators. We discuss either single pass and recirculated devices. As to this last case, we also include the effect due to quantum noise and damping.
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| WEPPP08 |
Computation of transfer maps from magnetic field data in large aspect-ratio apertures
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wiggler, dynamic-aperture, emittance, linear-collider |
198 |
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- C. E. Mitchell, A. Dragt
University of Maryland, College Park, Maryland
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Simulations indicate that the dynamic aperture of the proposed ILC Damping Rings is dictated primarily by the nonlinear properties of their wiggler transfer maps. Wiggler transfer maps in turn depend sensitively on fringe-field and high-multipole effects. Therefore it is important to have a detailed and realistic model of the interior magnetic field, including knowledge of high spatial derivatives. Modeling of these derivatives is made difficult by the presence of numerical noise. We describe how such information can be extracted reliably from 3-dimensional field data on a grid as provided, for example, by various 3-dimensional finite element field codes (OPERA-3d) available from Vector Fields. The key ingredients are the use of surface data and the smoothing property of the inverse Laplacian operator. We describe the advantages of fitting on an elliptic cylindrical surface surrounding the beam, as well as extensions to more general domain geometries useful for magnetic elements with large saggitta.
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| WEPPP17 |
Tracking Code with 3D Space Charge Calculations Taking into Account the Elliptical Shape of the Beam Pipe
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space-charge, electron, simulation, positron |
220 |
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- A. Markovik, G. Pöplau, U. van Rienen
Rostock University, Faculty of Computer Science and Electrical Engineering, Rostock
- R. Wanzenberg
DESY, Hamburg
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Funding: Work supported by DESY, Hamburg
The determination of electron cloud instability thresholds is a task with high priority in the ILC damping rings research and development objectives. Simulations of electron cloud instabilities are therefore essential. In this paper a new particle tracking program is presented which includes the Poisson solver MOEVE for space charge calculations. Recently, perfectly electric conducting beam pipes with arbitrary elliptical shapes have been implemented as boundary conditions in the Poisson solver package MOEVE. The 3D space charge algorithm taking into account a beam pipe of elliptical shape will be presented along with numerical test cases. The routine is also implemented in the program code ASTRA, in addition we compare the tracking with both routines.
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| WEA2IS02 |
Beam Control and Monitoring with FPGA-Based Electronics: Status and Perspectives
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controls, monitoring, instrumentation |
245 |
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- N. E. Eddy
Fermilab, Batavia, Illinois
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Modern FPGAs support designs using roughly 106 logic gates, pipeline speeds exceeding 200 MHz, internal SRAM, dedicated multipliers for signal processing, clock generation using phase-locked loops, and a variety of single-ended and differential I/O standards, including fast serial links. When interfaced with high-speed ADCs, DACs, and other components commonly found in telecom applications, FPGAs facilitate a wide range of beam control and monitoring applications. Examples include beam-position measurement, low-level RF control, instability damping, and manipulation of accelerator timing signals. Once signals of interest are in digital form, an instrument's FPGA logic and memory provide a natural means to capture data for remote diagnosis–both of beam behavior and of the instrument itself. Finally, FPGA-based solutions provide a flexible, reconfigurable, and reusable toolkit for instrumentation: existing modules are often adapted to implement new applications, and useful code fragments can be quickly copied from design to design.
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Slides
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| WEA3MP01 |
Strong-Strong Beam-Beam Simulations
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beam-beam-effects, simulation, coupling, collider |
250 |
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- T. Pieloni
CERN, Geneva
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During the collision of two charged beams the strong non-linear electromagnetic fields of the two beams perturb each other. This effect is called beam-beam interaction. Of particular interest in present and future machines are studies of the behaviour of equally strong and intense beams, the so-called strong-strong beam-beam interaction. After a careful definition of strong-strong beam-beam effects, I describe the applications where such studies are required. A major issue for strong-strong simulations are the computational challenges which are discussed. Finally I shall describe some of the modern techniques and procedures to solve them.
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Slides
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| WEA3MP04 |
Implementation and validation of space charge and impedance kicks in the code PATRIC for studies of transverse coherent instabilities in the FAIR rings
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space-charge, simulation, impedance, dipole |
267 |
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| WEA4IS01 |
Superconducting Cavity Design for the International Linear Collider
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simulation, dipole, linear-collider, collider |
271 |
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- A. C. Kabel, V. Akcelik, A. E. Candel, L. Ge, K. Ko, L. Lee, Z. Li, C.-K. Ng, E. E. Prudencio, G. L. Schussman, R. Uplenchwar, L. Xiao
SLAC, Menlo Park, California
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The International Linear Collider (ILC) is the highest priority future accelerator project in High Energy Physics whose R&D is presently the focus of the Global Design Effort (GDE). SLAC's Advanced Computations Department (ACD) is involved in the accelerating cavity design for the ILC main linac using the advanced tools developed under the US DOE SciDAC initiative. The codes utilize higher-order finite elements for increased accuracy and are in production mode on distributed memory supercomputers at NERSC and NCCS to perform the large-scale simulations needed by the ILC cavity design. Presently the code suite includes the eigensolver Omega3P for calculating mode damping, the time-domain solver T3P for computing wakefields, and the particle tracking code Track3P for simulating multipacting and dark current. This talk will provide an overview of their applications to the baseline TDR cavity design, and the alternate Low-Loss and Ichiro designs. Numerical results on HOM damping, cavity deformations, multipacting, and trapped modes in multi-cavity structures will be presented. Design issues with the input coupler and the HOM notch filter will also be addressed.
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