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Browsing Articles by Author "Norem, J."

Browsing Articles by Author "Norem, J."

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  • 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 ...
  • 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 ...
  • 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, ...
  • 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 ...
  • Modeling of High-Gradient Vacuum Breakdown 
    Ainabayev, A.; Berdenova, B.; Norem, J.; Insepov, Z. (arXiv preprint arXiv:1410.6501, 2014)
    Comsol finite element technique was applied to study heating and cooling of a microspot on the cathode surface. The reasons why there seems to be no common model for vacuum arcs, in spite of the importance of this field ...
  • Modeling RF breakdown arcs 
    Insepov, Z.; Norem, J.; Proslier, T.; Huang, D.; Mahalingam, S.; Veitzer, S. (arXiv preprint arXiv:1003.1736, 2010)
    We describe breakdown in 805 MHz rf accelerator cavities in terms of a number of self-consistent mechanisms. We divide the breakdown process into three stages: (1) we model surface failure using molecular dynamics of ...
  • Modeling Vacuum Arcs 
    Insepov, Z.; Norem, J.; Proslier, T.; Huang, D.; Mahalingam, S.; Veitzer, S. (arXiv preprint arXiv:1006.3770, 2010)
  • Sheath parameters for non-Debye plasmas: Simulations and arc damage 
    Morozov, I. V.; Norman, G. E.; Insepov, Z.; Norem, J. (Physical Review Special Topics-Accelerators and Beams, 2012)
    This paper describes the surface environment of the dense plasma arcs that damage rf accelerators, tokamaks, and other high gradient structures. We simulate the dense, nonideal plasma sheath near a metallic surface using ...