Initial Self-Consistent 3D Electron-Cloud Simulations of the LHC Beam with the Codewarp+Posinst

Vay, Jean‐Luc; Furman, M.A.; Cohen, R. H.; Friedman, A.; Grote, D.P.

doi:10.1109/pac.2005.1590806

Cited by 5 publications

(10 citation statements)

References 6 publications

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“…Comparisons of simulations using the new capability with HCX measurements have provided encouraging results and we are working toward getting even better agreement using the newly developed modules. The new capability is also being applied to the modeling of high-energy physics accelerators [19]. …”

Section: Resultsmentioning

confidence: 99%

Filling in the Roadmap for Self-Consistent Electron Cloud and Gas Modeling

Vay¹,

Furman²,

Seidl³

et al.

Proceedings of the 2005 Particle Accelerator Conference

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Electron clouds and gas pressure rise limit the performance of many major accelerators. A multi-laboratory effort to understand the underlying physics via the combined application of experiment, theory, and simulation is underway. We present here the status of the simulation capability development, based on a merge of the three-dimensional parallel Particle-In-Cell (PIC) accelerator code WARP and the electron cloud code POSINST, with additional functionalities. The development of the new capability follows a "roadmap" describing the different functional modules, and their inter-relationships, that are ultimately needed to reach self-consistency. Newly developed functionalities include a novel particle mover bridging the time scales between electron and ion motion, a module to generate neutrals desorbed by beam ion impacts at the wall, and a module to track impact ionization of the gas by beam ions or electrons. Example applications of the new capability to the modeling of electron effects in the High Current Experiment (HCX) are given.

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Section: Resultsmentioning

confidence: 99%

Filling in the Roadmap for Self-Consistent Electron Cloud and Gas Modeling

Vay¹,

Furman²,

Seidl³

et al.

Proceedings of the 2005 Particle Accelerator Conference

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“…The simulation tool is based on a merge of the Heavy Ion Fusion accelerator code WARP [4] and the High-Energy Physics electron cloud code POSINST [5,6], supplemented by additional modules for gas generation and ionization [7], as well as ion-induced electron emission from the Tech-X package TxPhysics [8]. The package allows for multi-dimensional (2-D or 3-D) modeling of a beam in an accelerator lattice and its interac-tion with electron clouds generated from photoninduced, ion-induced or electron-induced emission at walls, or from ionization of background and desorbed gas.…”

Section: The Warp/posinst Simulation Packagementioning

confidence: 99%

“…The model for the energy and angular distribution of the desorbed neutrals is based on molecular dynamics calculations (for more details, see [7]). …”

Section: Gas Modulementioning

confidence: 99%

“…Conversely, the interaction between the gas and the beam can lead to stripping, or capture, of electrons by the beam ions. We track these events using a Monte Carlo scheme similar to the one described in [16], where, for simplicity, we make the additional assumption (valid for current applications) that the gas reservoir is large enough, and the crosssections are small enough, that the depletion of gas due to its ionization can be neglected (for more details, see [7]). …”

Section: Ionization Modulementioning

confidence: 99%

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Self-consistent simulations of heavy-ion beams interacting with electron-clouds

Vay

Furman

Seidl

et al. 2007

Nuclear Instruments and Methods in Physics Research Section A:

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Electron-clouds and rising desorbed gas pressure limit the performance of many existing accelerators and, potentially, that of future accelerators including heavy-ion warm-dense matter and fusion drivers. For the latter, self-consistent simulation of the interaction of the heavy-ion beam(s) with the electron-cloud is necessary. To this end, we have merged the two codes WARP (HIF accelerator code) and POSINST (high-energy e-cloud build-up code), and added modules for neutral gas molecule generation, gas ionization, and electron tracking algorithms in magnetic fields with large time steps. The new tool is being benchmarked against the High-Current Experiment (HCX) and good agreement has been achieved. The simulations have also aided diagnostic interpretation and have identified unanticipated physical processes. We present the "roadmap" describing the different modules and their interconnections, along with detailed comparisons with HCX experimental results, as well as a preliminary application to the modeling of electron clouds in the Large Hadron Collider.

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“…The IMPACT code, originally developed for modeling beam dynamics in ion linacs, has been enhanced and is being applied to model HEP and BES photoinjectors [16]. Another example of this crosscutting nature is the simulation of electron effects: The codes WARP and POSINST, developed separately for applications in the HEP and FES programs, respectively, have been merged into a stateof-the-art capability for modeling electron-cloud effects [17] that is included in a SciDAC2 proposal. The impact of AST has also been enhanced in unexpected ways; for example, the QuickPIC code, originally developed for modeling plasma accelerators, has been enhanced and used for electron-cloud studies [18].…”

Section: Impact Of Scidac On Present and Future Accelerator Facilitiesmentioning

confidence: 99%

Extraordinary tools for extraordinary science: the impact of SciDAC on accelerator science and technology

Ryne

2006

J. Phys.: Conf. Ser.

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Abstract. Particle accelerators are among the most complex and versatile instruments of scientific exploration. They have enabled remarkable scientific discoveries and important technological advances that span all programs within the DOE Office of Science (DOE/SC). The importance of accelerators to the DOE/SC mission is evident from an examination of the DOE document, "Facilities for the Future of Science: A Twenty-Year Outlook." Of the 28 facilities listed, 13 involve accelerators. Thanks to SciDAC, a powerful suite of parallel simulation tools has been developed that represent a paradigm shift in computational accelerator science. Simulations that used to take weeks or more now take hours, and simulations that were once thought impossible are now performed routinely. These codes have been applied to many important projects of DOE/SC including existing facilities (the Tevatron complex, the Relativistic Heavy Ion Collider), facilities under construction (the Large Hadron Collider, the Spallation Neutron Source, the Linac Coherent Light Source), and to future facilities (the International Linear Collider, the Rare Isotope Accelerator). The new codes have also been used to explore innovative approaches to charged particle acceleration. These approaches, based on the extremely intense fields that can be present in lasers and plasmas, may one day provide a path to the outermost reaches of the energy frontier. Furthermore, they could lead to compact, high-gradient accelerators that would have huge consequences for US science and technology, industry, and medicine. In this talk I will describe the new accelerator modeling capabilities developed under SciDAC, the essential role of multi-disciplinary collaboration with applied mathematicians, computer scientists, and other IT experts in developing these capabilities, and provide examples of how the codes have been used to support DOE/SC accelerator projects.

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Initial Self-Consistent 3D Electron-Cloud Simulations of the LHC Beam with the Codewarp+Posinst

Cited by 5 publications

References 6 publications

Filling in the Roadmap for Self-Consistent Electron Cloud and Gas Modeling

Filling in the Roadmap for Self-Consistent Electron Cloud and Gas Modeling

Self-consistent simulations of heavy-ion beams interacting with electron-clouds

Extraordinary tools for extraordinary science: the impact of SciDAC on accelerator science and technology

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