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Browsing 02.National Laboratory Astana by Author "Insepov, Z."

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Browsing 02.National Laboratory Astana by Author "Insepov, Z."

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  • Acoustoelectric properties of graphene under the influence of saw and external electric field 
    Insepov, Z.; Tynyshtykbayev, Kurbangali B.; Kononenko, Oleg V.; Roshchupkin, Dmitry V. (Nazarbayev University, NURIS, Institute of Microelectronics Technology and High Purity Materials, 2015)
    The effect of SAW on the electrical properties of the few-layer (2-3 layers) graphene is studied. Under the influence of SAW the appearence of acoustoelectric current IAEC in graphene is observed. The sign and magnitude ...
  • 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 ...
  • A General Model of Vacuum Arcs in Linacs 
    Norem, J.; Insepov, Z. (Proceedings of NAPAC2016, Chicago, IL, USA, 2017-01)
    We are developing a general model of breakdown and gradient limits that applies to accelerators, along with other high field applications such as power grids and laser ablation. We have considered connections with failure ...
  • A model of rf breakdown arcs 
    Insepov, Z.; Bross, A.; Qian, Z.; Norem, J.; Huang, D.; Veitzer, S.; Torun, Y. (Fermilab, 2008)
    This paper presents a rst iteration of a model that attempts to describe all aspects of breakdown in rf cavities and provides some estimates of the parameters and parameter ranges involved, as an aid to producing more ...
  • A New Multiscale Approach to Nuclear Fuel Simulations: Atomistic Validation of Kinetic Method 
    Insepov, Z.; Rest, J.; Hofman, G. L.; Yacout, A.; Norman, G. E.; Starikov, S. A.; Stegailov, V. V. (Transactions of the American Nuclear Society, 2010)
    A key issue for fuel behavior codes is their sensitivity to values of various materials properties, many of which have large uncertainties or have not been measured. Kinetic mesoscale models, such as those developed at ...
  • Atomic layer deposition for TiO2 and TiN nanometer films 
    Ainabayev, Ardak; Bozheyev, Farabi; Zhuldassov, Abat; Lukasheva, Maria; Tynyshtykbaev, Kurbangali B.; Insepov, Z. (Materials Today: Proceedings, 2017-01-01)
    Abstract In this work processes of atomic layer deposition (ALD) of TiO2 and TiN using ALD method and impact of thickness and composition of grown film on stoichiometry and morphology of deposited layer are investigated. ...
  • 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 ...
  • 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, ...
  • Can surface cracks and unipolar arcs explain breakdown and gradient limits? 
    Insepov, Z.; Norem, J. (J. Vac. Sci. Technol, 2013)
    We argue that the physics of unipolar arcs and surface cracks can help understand rf breakdown, and vacuum arc data. We outline a model of the basic mechanisms involved in breakdown and explore how the physics of unipolar ...
  • 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 ...
  • Computational problems in modeling arcs 
    Norem, J.; Insepov, Z. (American Institute of Physics, 2016-10)
    We explore the reasons why there seems to be no common model for vacuum arcs, in spite of the importance of the field and the level of effort expended over more than one hundred years.
  • 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 ...
  • 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 ...
  • Craters on silicon surfaces created by gas cluster ion impacts 
    Allen, L. P.; Insepov, Z.; Fenner, D. B.; Santeufemio, C.; Brooks, W.; Jones, K. S.; Yamada, I. (Journal of applied physics, 2002)
    Atomic force microscopy ~AFM! and high-resolution transmission electron microscope ~HRTEM! cross section imaging of individual gas cluster ion impact craters on Si~100! and Si~111! substrate surfaces is examined. The ...
  • Effects of surface damage on rf cavity operation 
    Hassanein, A.; Insepov, Z.; Norem, J.; Moretti, A.; Qian, Z.; Bross, A.; Seidman, D. N. (Physical Review Special Topics-Accelerators and Beams, 2006)
    We describe a model of damage in rf cavities and show how this damage can limit cavity operation. We first present a review of mechanisms that may or may not affect the ultimate fields that can be obtained in rf cavities, ...
  • 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 ...
  • AN INTEGRATED APPROACH TO UNDERSTANDING RF VACUUM ARCS 
    Norem, J.; Insepov, Z.; Hassanein, A. (Nature Research, 2021-01-27)
    Although used in the design and costing of large projects such as linear colliders and fusion tokamaks, the theory of vacuum arcs and gradient limits is not well understood. Almost 120 years after the isolation of vacuum ...
  • Investigation of Nanohydrophobic Sand as an Insulating Layer for Cultivation of Plants in Soils Contaminated with Heavy Metals 
    Myrzabaeva, M.; Insepov, Z.; Boguspaev, K. K.; Faleev, D. G.; Nazhipkyzy, M.; Lesbayev, B. T.; Mansurov, Z. A. (urasian Chemico-Technological Journal, 2017)
    The paper presents the results of laboratory experiments to test hydrophobic sand, on the basis of soot as an insulating for growing plants-hyperaccumulators heavy metals ‒ amaranth (Amaranthus paniculatus) and sunflower ...
  • 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 ...