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Шығу күні бойынша Conference papers көру

Шығу күні бойынша Conference papers көру

Көрінетін элементтер 1-20 из 23

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Molecular dynamics study of implant and damage formation in low-energy boron cluster ion implantation

Aoki, T.; Matsuo, J.; Insepov, Z.; Yamada, I. (Ion Implantation Technology Proceedings, 1998 …, 1999, 1999)

Cluster ion implantation using decaborane (B,J-I,,) has been proposed as a useful technique for shallow junction formation. In order to examine the characteristics and advantages of cluster ion implantation, molecular ...
Computer simulation of decaborane implantation and rapid thermal annealing

Insepov, Z.; Aoki, T.; Matsuo, J.; Yamada, I. (IEEE. Ion Implantation Technology Proceedings, 1998 International Conference, 1999-12)

Molecular Dynamics (MD) and Metropolis Monte- Carlo (MMC) models of monomer B and decaborane implantation into Si and following rapid thermal annealing (RTA) processes have been developed. The implanted B dopant and Si-atomic ...
Radiation-induced synergistic effects of athermal and thermal mechanisms on erosion and surface evolution of advanced electrode and condenser optics materials

Allain, J. P.; Hassanein, A.; Burtseva, T.; Yacout, A.; Insepov, Z.; Taj, S.; Rice, B. J. (Proceedings of SPIE, 2004-02)

In extreme ultraviolet lithography (EUVL) environments transient plasma dynamics dictate conditions for particle/surface interactions. A critical challenge facing EUVL development is optic component lifetime both in ...
Breakdown in RF cavities

Norem, J.; Hassanein, A.; Insepov, Z.; Konkashbaev, I. (Proceedings of 2005 Particle Accelerator Conference, Knoxville, Tennessee, 2005)

We present a simple model of breakdown in rf cavities. For most events this involves tensile stress and tensile strength, however other effects can also contribute. We discuss the effects of different materials, fatigue, ...
High Surface Fields in Superconducting rf Cavities. In Proceedings of SRF

Norem, J.; Insepov, Z.; Bauer, P.; Seidman, D.N.; Sebastian, J.; Yoon, K. (Proceedings of the 12th International Workshop on RF Superconductivity, Cornell University, 2005)

Field emission in cavities requires electric fields that can be high enough to damage materials. We outline a model of breakdown and field emission from local asperities, and show how electric field effects, and field ...
The Interactions of Surface Damage on RF Cavity Operation

Norem, J.; Bross, A.; Hassanein, A.; Qian, Z.; Yoon, K. E.; Moretti, A.; Li, D. (Fermilab, 2006-06)

Studies of low frequency RF systems for muon cooling has led to a variety of new techniques for looking at dark currents, a new model of breakdown, and, ultimately, a model of RF cavity operation based on surface damage. ...
Computer simulation of bubble formation

Insepov, Z.; Bazhirov, T.; Norman, G.; Stegailov, V. (Joint International Topical Meeting on Mathematics & Computation and Supercomputing in Nuclear Applications, 2007-04)

Properties of liquid metals (Li, Pb, Na) containing nanoscale cavities were studied by atomistic Molecular Dynamics (MD). Two atomistic models of cavity simulation were developed that cover a wide area in the phase diagram ...
A design for large-area fast photo-detectors with transmission-line readout and waveform sampling

Adams, B.; Anderson, J. T.; Attenkofer, K.; Bogdan, M.; Byrum, K.; Drake, G.; Insepov, Z. (In Real Time Conference, 2009. RT'09. 16th IEEE-NPSS (pp. 49-61). IEEE., 2009)

We present a preliminary design and the results of simulation for a photo-detector module to be used in applications requiring the coverage of areas of many square meters with time resolutions less than 10 picoseconds and ...
Advanced Surface Polishing For Accelerator Technology Using Ion Beams

Insepov, Z.; Norem, J.; Hassanein, A.; Wu, A. T. (American Institute of Physics, 2009-03)

Surface erosion problems are common in the development of TeV accelerators, fusion and fission reactors, semiconductor, optical and magnetic storage devices, and Extreme Ultra-Violet (EUV) lithography devices. We have ...
Beam-Induced Electron Loading Effects in High Pressure Cavities for a Muon Collider

Chung, M.; Tollestrup, A.; Jansson, A.; Yonehara, K.; Insepov, Z. (Proceedings of IPAC’10, Kyoto, Japan, 2010)

Ionization cooling is a critical building block for the realization of a muon collider. To suppress breakdown in the presence of the external magnetic field, an idea of using an RF cavity filled with high pressure hydrogen ...
Study of Electron Swarm in High Pressure Hydrogen Gas Filled RF Cavities

Yonehara, K.; Chung, M.; Popovic, M.; Moretti, A.; Wang, H.; Alsharo'a, M.; Insepov, Z. (Fermilab, 2010)

A high pressure hydrogen gas filled RF cavity has been proposed for use in the muon collection system for a muon collider. It allows for high electric field gradients in RF cavities located in strong magnetic fields, a ...
The problem of RF gradient limits

Norem, J.; Insepov, Z.; Huang, D.; Mahalingam, S.; Veitzer, S. (American Institute of Physics, 2010-03)

We describe breakdown in rf accelerator cavities in terms of a number of mechanisms. We divide the breakdown process into three stages: 1) we model surface failure using molecular dynamics of fracture caused by electrostatic ...
Vacuum arcs and gradient limits

Norem, J.; Moretti, A.; Insepov, Z. (Proceedings of 2011 Particle Accelerator Conference, New York, 2011)

We have been extending and refining our model of vacuum breakdown and gradient limits and describe recent developments. The model considers a large number of mechanisms, but finds that vacuum arcs can be described fairly ...
Comparison of back-scattering properties of electron emission materials

Insepov, Z.; Ivanov, V.; Jokela, S.; Wetstein, M. (Proceedings of 2011 Particle Accelerator Conference, New York, 2011)

We use “microscopic” Monte Carlo (MC) simulations, empirical theories, and comparison with experiments to identify the influence of back-scattered electrons and the saturation effect on the emissive properties of materials ...
Simulation of ion implantation into nuclear materials and comparison with experiment

Insepov, Z.; Yun, D.; Ye, B.; Rest, J.; Starikov, S.; Yacout, A. M. (American Institute of Physics, 2011-06)

Radiation defects generated in Mo formed by sub-MeV Xe ion implantations were studied by atomistic molecular dynamics based on interatomic potential matched to density functional calculations. The results of the simulations ...
Ion Solid Interaction And Surface Modification At RF Breakdown In High‐Gradient Linacs

Insepov, Z.; Norem, J.; Veitzer, S. (American Institute of Physics, 2011-06)

Ion solid interactions have been shown to be an important new mechanism of unipolar arc formation in high-gradient rf linear accelerators through surface self-sputtering by plasma ions, in addition to an intense surface ...
Modeling arcs

Insepov, Z.; Norem, J.; Vetizer, S.; Mahalingam, S. (American Institute of Physics, 2011-12)

Although vacuum arcs were first identified over 110 years ago, they are not yet well understood. We have since developed a model of breakdown and gradient limits that tries to explain, in a self-consistent way: arc triggering, ...
Simulations of Fast X-Ray Detectors Based on Multichannel Plates

Adams, B.; Insepov, Z.; Ivanov, V.; Norem, J. (Proceedings of IPAC2012, New Orleans, Louisiana, 2012)

High-performance detectors with high spatial and time resolutions are required in applications such as imaging of fast processes, time-resolved coherent scattering, and time-resolved X-ray spectroscopy. Recently a new type ...
Modeling vacuum arcs in linac structures

Norem, J.; Moretti, A.; Insepov, Z.; Nurkenov, S. (Proceedings of PAC2013, Pasadena, 2013)

We describe our vacuum arc model, which divides breakdown into four stages: trigger, plasma formation, plasma evolution and surface damage. We have modeled all four stages numerically and find that the properties of surface ...
Multiscale simulation of ion beam impacts on a graphene surface

Dybyspayeva, K. B.; Zhuldassov, A.; Ainabayev, A.; Vyatkin, A. F.; Alekseev, K.; Insepov, Z. (IOP Publishing, 2016-09)

Multiscale study of single and multilayer graphene irradiation is presented in this paper. Ab-initio density-functional theory (DFT) was used to study point defects, and a large scale parallel molecular-dynamics (MD) ...