David Ennis headshot
David Ennis
Department of Physics
Associate Professor

Research Areas: Experimental Plasma Physics

Office: Leach Science Center 3110

Address: 380 Duncan Drive
Auburn, AL 36849

Phone: (334) 844-4366

Fax: (334) 844-4613


Education
Ph.D., University of Wisconsin-Madison
2008
B.A. Bates College
1999


Professional Employment
Associate Professor, Department of Physics, Auburn University
2019 - Present
Assistant Professor, Department of Physics, Auburn University
2013 - 2019
Instructor, Thermodynamics, University of Washington
Spring 2012 - 2013
Research Associate, Department of Aeronautics and Astronautics, University of Washington
2008 - 2012


Selected Publications

  1. M.D. Pandya, D.A. Ennis, J.D. Hanson, G.J. Hartwell, and D.A. Maurer. "The magnetic structure of long-wavelength magnetohydrodynamic modes in current-carrying stellarator plasma" Physics of Plasmas 28, 112503 (2021).
  2. C.A. Johnson, S.D. Loch, D.A. Ennis. “The effect of metastable atomic levels in neutral tungsten for erosion and impurity transport applications” Plasma Physics and Controlled Fusion 62, 125017 (2020).
  3. S.J. Bromley, C.A. Johnson, D.A. Ennis, G.J. Hartwell, D.A. Maurer, S.D. Loch, P.C. Stancil, B.M. McLaughlin, C.E. Sosolik, and J.P. Marler “Panning for Gold: New Emis- sion Lines from UVVIS Spectroscopy of Au I and Au II” Astrophysical Journal Supplement Series 250, 19 (2020).
  4. Valeria Perseo, Dorothea Gradic, Ralf K ̈onig, Oliver P. Ford, Carsten Killer, Olaf Grulke, David A. Ennis, and W7-X Team. “Coherence imaging spectroscopy at Wendelstein 7-X for impurity flow measurements” Review of Scientific Instruments 91, 013501 (2020).
  5. J. Guterl, C. Johnson, D. Ennis, S. Loche, P. Snyder. “Effects of the Chodura sheath on tungsten ionization and emission in tokamak divertors” Contributions to Plasma Physics (2019).
  6. V. Perseo, F. Effenberg, D. Gradic, R. König, O.P. Ford, F. Reimold, D.A. Ennis, O. Schmitz, T. Sunn Pedersen, and the W7-X Team. “Direct measurements of counter-streaming flows in a low-shear stellarator magnetic island topology” Nuclear Fusion 59, 124003 (2019).
  7. C.A. Johnson, D.A. Ennis, S.D. Loch, G.J. Hartwell, D.A. Maurer, S.L. Allen, B.S. Victor, C.M. Samuell, T. Abrams, E.A. Unterberg, and R.T. Smyth. “Advances in neutral tungsten ultraviolet spectroscopy for the potential benefit to gross erosion diagnosis” Plasma Physics and Controlled Fusion 61, 095006 (2019).
  8. C.A. Johnson, S.D. Loch, D.A. Ennis. “ColRadPy: A Python collisional radiative solver” Nuclear Materials and Energy 20, 100579 (2019).
  9. C.J. Favreau, C.A. Johnson, D.A. Ennis, and S.D. Loch. “The role of excited-state ionization on the effective ionization of neutral neon using non-perturbative atomic data” Journal of Physics B 52, 095203 (2019).
  10. J.L. Herfindal, D.A. Maurer, G.J. Hartwell, D.A. Ennis, J.D. Hanson, S.F. Knowlton, X. Ma, M.D. Pandya, N.A. Roberds, and P.J. Traverso. “Sawtooth oscillation behavior with varying amounts of applied stellarator rotational transform” Physics of Plasmas 26, 032502 (2019).
  11. Dorothea Gradic, Valeria Perseo, Ralf König, David Ennis, the W7-X team. “A new calibration implementation for Doppler Coherence Imaging Spectroscopy” Fusion Engineering and Design 146, 995–998 (2019).
  12. R.T. Smyth, C.P. Ballance, C.A Ramsbottom, C.A. Johnson, D.A. Ennis, and S.D. Loch. “Dirac R-matrix calculations for the electron-impact excitation of W I providing non-invasive diagnostics for magnetic confinement fusion” Physical Review A 97, 052705 (2018).
  13. X. Ma, M.R. Cianciosa, D.A. Ennis, J.D. Hanson, G.J. Hartwell, E.C. Howell, S.F. Knowlton, D.A. Maurer, and P. J. Traverso. “Determination of current and rotational transform profiles in a current-carrying stellarator using soft x-ray emissivity measurements” Physics of Plasmas 25, 012516 (2018).
  14. R.T. Smyth, C.A. Johnson, D.A. Ennis, S.D. Loch, C.A Ramsbottom, and C.P. Ballance. “Relativistic R-matrix calculations for the electron-impact excitation of neutral molybdenum” Physical Review A 96, 042713 (2017).
  15. G.J. Hartwell, S.F. Knowlton, J.D. Hanson, D.A. Ennis, and D.A. Maurer. “Design, construction, and operation of the Compact Toroidal Hybrid” Fusion Science and Technology 72, 76 (2017).
  16. X. Ma, D.A. Maurer, S.F. Knowlton, M.C. ArchMiller, M.R. Cianciosa, D.A. Ennis, J.D. Hanson, G.J. Hartwell, J.D. Hebert, J. L. Herfindal, M.D. Pandya, N.A. Roberds, and P. J. Traverso. “Non-axisymmetric equilibrium reconstruction of a current-carrying stellarator using external magnetic and soft x-ray inversion radius measurements” Physics of Plasmas 22, 122509 (2015).
  17. M.D. Pandya, M.C. ArchMiller, M.R. Cianciosa, D.A. Ennis, J.D. Hanson, G.J. Hartwell, J.D. Hebert, J.L. Herfindal, S.F. Knowlton, X. Ma, S. Massidda, D.A. Maurer, N.A. Roberds, and P.J. Traverso. “Low edge safety factor operation and passive disruption avoidance in current carrying plasmas by the addition of stellarator rotational transform” Physics of Plasmas 22, 110702 (2015).
  18. P.J. Traverso, D.A. Maurer, D.A. Ennis, G.J. Hartwell, M.M. Goforth, S.D. Loch, A.J. Pearce, and M.R. Cianciosa. “Thomson scattering diagnostic system design for the Compact Toroidal Hybrid experiment” Review of Scientific Instruments 85, 11D852 (2014).
  19. J.L. Herfindal, J.D. Dawson, D.A. Ennis, G.J. Hartwell, S.D. Loch, and D.A. Maurer. “Design and initial operation of a two-color soft x-ray camera system on the Compact Toroidal Hybrid experiment” Review of Scientific Instruments 85, 11D850 (2014).
  20. M.C. ArchMiller, M.R. Cianciosa, D.A. Ennis, J.D. Hanson, G.J. Hartwell, J.D. Hebert, J.L. Herfindal, S.F. Knowlton, X. Ma, D.A. Maurer, M.D. Pandya, and P. Traverso. “Suppression of vertical instability in elongated current-carrying plasmas by applying stellarator rotational transform” Physics of Plasmas 21, 056113 (2014).






Last updated: 02/26/2023