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Title |
Page |
| TUPP088 |
Software Components for Electron Cloud Simulation
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1735 |
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- D. R. Dechow, P. Stoltz
Tech-X, Boulder, Colorado
- J. F. Amundson, P. Spentzouris
Fermilab, Batavia, Illinois
- B. Norris
ANL, Argonne, Illinois
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The Synergia2 beam dynamics code is an attempt to incorporate state-of-the-art space charge models from the Impact code into the Chef accelerator tracking code. The need to add new accelerator physics capabilities to the Synergia2 framework has led to software development efforts based on the Common Component Architecture (CCA). The CCA is a specification and a toolset for developing HPC from interchangeable parts, called components. Electron cloud is a potentially limiting effect in the performance of both high-intensity electron and proton machines. The modeling of electron cloud effects is important for the Fermilab main injector. Here, electron cloud effects are expected to play a significant role when the main injector operates in the regime of a high-intensity proton source for the neutrino program. In the ideal case, computational accelerator physicists would like to be able model electron cloud generation and dynamics in a single, self-consistent simulation. As a first step towards creating component-based, electron cloud generation simulations, this work describes a CCA component created from TxPhysics, a library of impact and field ionization routines.
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| WEPP111 |
Modeling Breakdown in RF Cavities Using Particle-in-cell (PIC) codes
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2767 |
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- S. Mahalingam, J. R. Cary, P. Stoltz, S. A. Veitzer
Tech-X, Boulder, Colorado
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A main limitation on future accelerator projects is breakdown of metallic structures. We have developed computer models of the process of breakdown using Particle-In-Cell (PIC) codes which include: Fowler-Nordheim field emission due to large surface electric fields, impact ionization of neutral gas, ion-induced secondary electron emission, ion-induced sputtering of neutrals, the effects of applied magnetic fields, plasma radiation effects, and surface heating. Two computational tools have been used to self-consistently model the breakdown. These are- OOPIC Pro, a 2-Dimensional serial electromagnetic code with cylindrical coordinates, and
- VORPAL, a 3-Dimensional massively parallel electromagnetic code with cartesian grids.
We describe here the results of our numerical experiments including the effects of applied magnetic field strength and direction on the breakdown process, sensitivity of breakdown triggers on field emission parameters, and the potential to measure the onset of breakdown by examining impurity radiation. We show comparison with breakdown experiments performed at Fermilab and Argonne for copper structures being considered for a future muon collider project.
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