Janez Krek

Ph.D. student

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Spartans will!

About me

Current interest/research

I'm a Ph.D. student in the Plasma Theory and Simulation Group (PTSG) at Michigan State University with advisor Prof. John Verboncoeur. My field of research is low-temperature high-pressure plasma simulations and chemical kinetics.

Research Interests

  • Global Models:
    Coupling of a Boltzmann equation solver (BES) with the Kinetic Global Model framework (KGMf) to self-consistently compute electron energy distribution function (EEDF).
  • Gas Discharge Physics:
    low-temperature high pressure plasmas
  • Computational Modeling:
    hybrid models (global model + PIC), global models (KGMf), particle-in-cell (PIC, oopd1, xoopic)

email

krek@msu.edu

College of Engineering

egr.msu.edu

website

egr.msu.edu/~krek

CMSE department

cmse.msu.edu

MSU

msu.edu

Recent publications

Journal Papers

  1. Yangyang Fu, Janez Krek, De-Qi Wen, Peng Zhang, and John P. Verboncoeur, Transition of low-temperature plasma similarity laws from low to high ionization degree regimes, Plasma Sources Sci. Technol. 28, 095012 (2019).
  2. Yangyang Fu, Peng Zhang, Janez Krek, and John P. Verboncoeur, Gas breakdown and its scaling law in microgaps with multiple concentric cathode protrusions, Appl. Phys. Lett. 114, 014102 (2019).
  3. Yangyang Fu, Janez Krek, Peng Zhang, and John P. Verboncoeur, Gas Breakdown in Microgaps With a Surface Protrusion on the Electrode, IEEE Trans. Plasma Sci. 47, 2011 (2019).
  4. Yangyang Fu, Janez Krek, Peng Zhang, and John P. Verboncoeur, Evaluating microgap breakdown mode transition with electric field non-uniformity, Plasma Sources Sci. Technol. 27, 9 (2018).
  5. Yangyang Fu, Janez Krek, Guy M. Parsey, and John P. Verboncoeur, Characterizing the dominant ions in low-temperature argon plasmas in the range of 1-800 Torr, Phys. Plasmas, 25: 033505 (2018).
  6. Janez Benedičič, Janez Krek, Vilko Leben, Gusztav Velez Vörös, Tadej Beravs, Simon Potočnik, and Roman Žavbi. Development of an automatic marketplace using virtual collaboration, Technical Gazette, 22: 431 (2015).
  7. Janez Krek, Nikola Jelić, and Jože Duhovnik. Grid-free treecode method in diode simulation, Nucl. Eng. Des., 261: 238 (2013).
  8. Janez Krek, Nikola Jelić, and Jože Duhovnik. Particle-in-cell (PIC) simulations on plasma-sheath boundary in collision-free plasmas with warm-ion sources, Nucl. Eng. Des., 241: 1261 (2011).

Conference Abstracts, Papers, and Presentations

  1. Janez Krek, Yangyang Fu, and John P. Verboncoeur. Benchmarking the Kinetic Global Model framework (KGMf): EEDF evaluations in low-temperature argon plasmas. 2019 IEEE Pulsed Power and Plasma Science Conference (PPPS), Orlando, Florida, USA, June 23-28, (2019); (oral)
  2. Yangyang Fu, Janez Krek, DeQi Wen, Peng Zhang, and John P. Verboncoeur. Transition of low-temperature plasma similarity laws from low to high ionization degree regimes. 2019 IEEE Pulsed Power and Plasma Science Conference (PPPS), Orlando, Florida, USA, June 23-28, (2019).
  3. DeQi Wen, Peng Zhang, Yangyang Fu, Janez Krek, and John P. Verboncoeur. Multipactor dynamics under obliquely incident rf electric field. 2019 IEEE Pulsed Power and Plasma Science Conference (PPPS), Orlando, Florida, USA, June 23-28, (2019).
  4. Yangyang Fu, Janez Krek, Peng Zhang, John P. Verboncoeur, Guy Parsey, and Mark Kushner. Characterizing breakdown voltage in micro-gaps with multiple field emitters at atmospheric pressure. 2019 IEEE Pulsed Power and Plasma Science Conference (PPPS), Orlando, Florida, USA, June 23-28, (2019).
  5. Yangyang Fu, Janez Krek, De-Qi Wen, Peng Zhang, and John P. Verboncoeur. On the deviations of similarity laws in low-temperature discharges. The 71th Annual Gaseous Electronics Conference (GEC), Portland, Oregon, USA, November 5-9, (2018).
  6. De-Qi Wen, Yangyang Fu, Janez Krek, Peng Zhang, and John P. Verboncoeur. Effect of linearly and elliptically polarized electric fields on multipactor discharges. The 71th Annual Gaseous Electronics Conference (GEC), Portland, Oregon, USA, November 5-9, (2018).
  7. Yangyang Fu, Janez Krek, Peng Zhang, and John P. Verboncoeur. Gas Breakdown in Microgaps with Electrode Surface Protrusions: Paschen’s curve, Non-uniformity of Electric Field, and Breakdown Mode Transitions. iPlasmaNano-IX 2018 conference on plasma nanoscience and nanotechnology, New Buffalo, MI, USA, August 26-29, (2018).
  8. Yangyang Fu, Janez Krek, and John P. Verboncoeur. Evolutions of electron energy probability function in low-pressure radio-frequency discharges. Gordon Research Conferences: Plasma Processing Science, Fundamental Insight in Plasma Processes, Smithfield, Rhode Island, USA, August 5-10, (2018).
  9. De-Qi Wen, Yangyang Fu, Janez Krek, Peng Zhang, and John P Verboncoeur. Effect of linearly and elliptically polarized electric fields on multipactor discharges. Bulletin of the American Physical Society, (2018).
  10. Yangyang Fu, Janez Krek, De-qi Wen, Peng Zhang, and John P Verboncoeur. On the deviations of similarity laws in low-temperature discharges. Bulletin of the American Physical Society, (2018).
  11. Janez Krek, Yangyang Fu, and John P. Verboncoeur. Dynamic evaluation frequency of Boltzmann equation solver in the KGMf. The 45th IEEE International Conference on Plasma Science (ICOPS), Denver, Colorado, USA, June 24-28, (2018); (poster)
  12. Yangyang Fu, Janez Krek, and John P Verboncoeur. Similarities of Low-temperature Discharge Plasmas and Their Applications. The 9th Annual Meeting of the Plasma Science Center (PSC), Bethesda, Maryland, USA, June 17-18, (2018).
  13. Janez Krek, Yangyang Fu, and John P. Verboncoeur. Evaluating the EEDF for the Global Modeling of Low-temperature Plasmas. The 9th Annual Meeting of the Plasma Science Center (PSC), Bethesda, Maryland, USA, June 17-18, (2018); (poster)
Detail list of experience/projects is available in my CV or on Google Scholar.

Education

1990 - 1996

Bachelor of Science (B.Sc.), Mechanical Engineering

University of Ljubljana

Faculty of Mechanical Engineering

Title: Solid modeller based on CSG and BREP
Advisors: Prof. Jožef Duhovnik and Dr. Leon Kos

2012 - 2015

Master of Science (M.Sc.), Computational Plasma Physics

University of Ljubljana

Faculty of Mechanical Engineering

Title: Application of Numerical Methods and Computational Simulations to Plasma-Sheath Conditions for Virtual Cathodes Under High Emission
Advisors: Assistant Prof. Leon Kos and Prof. Jožef Duhovnik

Thesis download: PDF (ENG language, 8.6Mb)

Skills

Programming

  • advanced skills in Python, C/C++, shell scripting
  • web development: PHP, mySQL, Apache, HTML, CSS
  • basic programming skills in Java (Android), Matlab, Perl, FORTRAN, BASIC and Clipper (dBASE compiler/language)
  • capable of designing and developing a custom CMS system
  • knowledge of version control systems: GIT, subversion

Computer Software

  • advanced knowledge (administration level) of Linux, UNIX and Windows OS
  • certified Linux administrator (LPI level 1)
  • knowledge in server virtualization with XEN
  • knowledge in maintaining of heterogeneous networks
  • advanced knowledge in Content Management Tools (CMS): done complete custom plug-in and theme development for WordPress
  • knowledge of Mathematica and Office suits

Experience

  • 2010 - Present

    simulation code development

    University of Ljubljana; Michigan State University

    Ljubljana, Slovenia; East Lansing, USA

    Extending the functionality of simulation code suites in C/C++ and Python: oopd1 (tree-code method), xoopic (adding diagnostics), the Kinetic Global Model framework - KGMf (user interaction, Boltzmann eq. solver)

  • Euroteh, xGroup

    Ljubljana, Slovenia

    Mobile/web application development, website design and development. Design and development of a complete solution for mobile data acquisition: mobile application for Android OS (Java) and server application for serving road warriors and clients (PHP, mySQL, HTML, CSS).

    2006 - 2015

    IT consulting, mobile/web application development, system administration

  • 2003 - 2006

    fusion plasma application development

    University of Ljubljana, LECAD laboratory

    Ljubljana, Slovenia

    The application development in project “Research of boundary conditions for fusion plasma and their implementation in existing and future simulation programs”; in C for Linux/X11 environment.

  • University of Ljubljana, LECAD laboratory

    Ljubljana, Slovenia

    A teaching assistant in the undergraduate study in a field of Computer-Aided Design, with focus on programming.

    1996 - 2005

    teaching assistant

Detail list of experience/projects is available in my CV.