Koepke Group

Prof. Mark Koepke, Prof. Vladimir Demidov, and Prof. Dimitris Vassiliadis work collaboratively on a wide range of plasma subdisciplines (space plasmas, industrial plasmas, fundamental plasma physics, diagnostic techniques, numerical modeling of plasmas), essentially operating as a single group, with maximum interaction between students and between students and professors.

Prof. Mark Koepke, Dr. Valeriy Gavrishchaka, and Prof. David Hartley work collaboratively on interdisciplinary nonlinear dynamics (driven oscillations, biochemical physics, econophysics, decision-making algorithms)

Prof. Mark Koepke represents the U.S. plasma physics community as the U.S. Member in the International Union for Pure and Applied Physics. IUPAP fosters international cooperation through physics and serves the world through a wide range of activities, from international research facilities, to mentoring scientists and students in developing nations, to organizing scientific workshops and conferences for international graduate students, women, and discipline-wide array of plasma physicists.

Mark Koepke is a co-investigator on a handful of research projects around the world, as is an Affiliated Professor at the Royal Institute of Technology (KTH) in Stockholm, Sweden. He is a Fellow of the American Physical Society, the Institute of Physics (U.K.), and the Japanese Society for Promotion of Science (JSPS).

Publications (Koepke Group)

87. "A two-fluid model describing the finite conductivity, stationary Alfven wave in anisotropic plasma," S. M. Finnegan, M. E. Koepke, D. J. Knudsen, Nonlin. Processes Geophys. 15, 957-964 (2008).

86. "Interrelated laboratory and space plasma experiments," M. E. Koepke, Reviews of Geophysics 46, RG3001, doi:10.1029/2005RG000168, 16 July (2008).

85. "The dispersive Alfvén wave in the time-stationary limit with a focus on collisional and warm-plasma effects," S. M. Finnegan, M. E. Koepke, and D. J. Knudsen, Phys. Plasmas 15, 052108 (2008).

84. "Integrated campaign to study stationary Alfvén wave in the laboratory and space regimes," M. E. Koepke, S. M. Finnegan, S. Vincena, D. J. Knudsen, C. Chaston, Plasma Physics and Controlled Fusion 50, 074004 (2008).

83. "Interrelationship between plasma phenomena in the laboratory and in space," M. E. Koepke, Plasma Physics and Controlled Fusion 50, 070201 (2008).

82. "Spectral characteristics of the collisional stationary Alfven wave in the laboratory and space regimes," S. M. Finnegan, M. E. Koepke, and D. J. Knudsen, Plasma Physics and Controlled Fusion 50, 074005 (2008).

81. "Laboratory plasma physics," M. E. Koepke, in Recent Research Developments in Plasma Physics, 2007, J. Weiland, ed. (Transworld Research Network, Kerala, India, 2008) chapter 7 (28 book pages, invited chapter).

80. "Simulations of a plasmoid penetrating a magnetic barrier," H. Gunell, T. Hurtig, H. Nilsson, M. Koepke, and N. Brenning, Plasma Physics and Controlled Fusion 50, 074013 (2008).

79. "Shear driven waves in the induced magnetosphere of Mars," H. Gunell, U. V. Amerstorfer, H. Nilsson, C, Grima, M. Koepke, M. Fränz, J. D. Winningham, R. A. Frahm, J.-A. Sauvand, A. Fedorov, V. Erkaev, H. K. Biernat, M. Holmström, R. Lundin, and S. Barabash, Plasma Physics and Controlled Fusion 50, 074018 (2008).

78. "Simultaneous, co-located parallel-flow shear and perpendicular-flow shear in low-temperature, ionospheric-plasma relevant, laboratory plasma," M. E. Koepke and E. W. Reynolds, Plasma Phys. Controlled Fusion 49, A145-A157 (May 2007).

77. "Investigation of a radio-frequency inductive-coupled-plasma discharge afterglow in noble gases," C. A. DeJoseph, V. I. Demidov, J. C. Blessington, and M. E. Koepke, J. Phys. B: Atomic, Molecular, and Optical Physics, 40, 3823-3833 (October 2007).

76. "Dynamics of small dust clouds trapped in a magnetized anodic plasma," I. Pilch, A. Piel, T. Trottenberg, and M. E. Koepke, Phys. Plasmas, 12, 123704 (December 2007, 8 pages).

75. "Baffled-probe cluster for simultaneous, single-point monitoring of magnetized plasma fluctuations," M. E. Koepke, V. I. Demidov, S. M. Finnegan, and E. W. Reynolds, Contrib. Plasma Phys. 46, 395-401 (2006).

74. "Inhomogeneity scale lengths in a magnetized, low temperature, collisionless, Q-machine plasma column containing perpendicular-velocity shear," E. W. Reynolds, M. E. Koepke, J. J. Carroll, and S. Shinohara, Phys. Plasmas 13, 092106 (2006). 12 pages

73. "Electron parallel-flow shear driven low-frequency electromagnetic modes in collisionless magnetoplasma," P. K. Shukla, B. Eliasson, and M. Koepke, Phys. Plasmas 13, 052115 (2006). 6 pages

72. "Radiation from an electron beam in a magnetized plasma: Whistler mode wave packets," N. Brenning, I. Axnäs, M. A. Raadu, E. Tennfors, and M. Koepke, J. Geophys. Res. 111, A11212, doi:10.1029/2006JA011739 (2006).

71 “Laser-induced-fluorescence characterization of velocity shear in a magnetized plasma column produced by a segmented, Q-machine source,” E. W. Reynolds, T. Kaneko, M. E. Koepke, and R. Hatakeyama, Phys. Plasmas 12, 072103 (2005).

70. “Velocity-shear-driven drift waves with simultaneous modes in a barium-ion Q-machine plasma,” T. Kaneko, E. W. Reynolds, R. Hatakeyama, and M. E. Koepke, Phys. Plasmas 12, 102106 (2005).

69. “Effect of the bounce orbit’s turning-point locataion on bounce-resonance Landau damping,” M. E. Koepke, Physica Scripta T116, 107 (2005).

68. “On interrelating laboratory experiments and geoplasma observations,” M. E. Koepke, Plasma Phys. Controlled Fusion 47, B727-B734 (2005).

67. “Utility of a baffled probe for measurements of oscillations in magnetized plasma,” V. I. Demidov, S. M. Finnegan, M. E. Koepke, and E. W. Reynolds, Contrib. Plasma Physics 44, 689-694 (2004)

66. “Lower-hybrid cavity density depletions as a result of transverse ion acceleration localized on the
gyroradius scale”, D. J. Knudsen, B. J. J. Bock, S. R. Bounds, J. K. Burchill, J. H. Clemmons, J. D. Curtis, A. I. Eriksson, M. E. Koepke, R. F. Pfaff, D. D. Wallis, and N. Whaley, J. Geophys. Res., 109, A04212, doi:10.1029/2003JA010089 (20 April 2004).

65. “Sheared-flow-driven electrostatic waves in laboratory and space plasmas,” M. E. Koepke, Physica Scripta T107, 182-187 (2004).

64. “Utility of a baffled Langmuir probe for applications to edge plasma and turbulence characterization in
stellarator plasma,”W. Guttenfelder, C. Lechte, M. E. Koepke, and V. I. Demidov, Rev. Sci. Instrum. 75, 3622 (2004).

63. “On the role of ion-temperature anisotropy in the growth and propagation of ion-acoustic waves,” C.
Teodorescu, M. E. Koepke, E. W. Reynolds, J. Geophys. Res. 108, SMP 25.1 - 25.10 (2003).

“Resonant-to-nonresonant transition in electrostatic ion-cyclotron phase velocity”, J. J. Carroll III, M. E.
Koepke, M. W. Zintl, and V. Gavrishchaka, Nonlinear Processes in Geophysics 10, 131-138 (2003).

61. “Space-relevant studies of ion-acoustic and ion-cyclotron,” M. E. Koepke, C. Teodorescu, and E. W.
Reynolds, Plasma Phys. and Controlled Fusion 45, 869-889 (2003).

60. “Laboratory-device configurations for investigating new dusty-plasma equilibria”, M. E. Koepke and N. Sato, New Journal of Physics 5, 42.1-42.14 (2003).

59. “Inverse ion-cyclotron damping: Laboratory demonstration and space ramifications,” M. E. Koepke, C.
Teodorescu, E. W. Reynolds, C. C. Chaston, C. W. Carlson, J. P. McFadden, and R. E. Ergun, Phys. Plasmas 10, 1605-1613 (2003).

58. “A baffled probe for real-time measurements of space potential in magnetized plasma,” V. I.
Demidov, S. M. Finnegan, M. E. Koepke, and E. W. Reynolds, Rev. Sci. Instrum. 74 , 4558 (2003).

57.”Inverse ion-cyclotron damping: Laboratory demonstration and space ramifications,” M. E. Koepke, C. Teodorescu, E. W. Reynolds, C. C. Chaston, C. W. Carlson, J. P. McFadden, and R. E. Ergun, Phys. Plasmas 10, 1605-1613 (2003).

56.”Laboratory-device configurations for investigating new dusty-plasma equilibria”, M. E.
Koepke and N. Sato, New Journal of Physics 5, 42.1-42.14 (2003).

55.”Space-relevant studies of ion-acoustic and ion-cyclotron”, M. E. Koepke, C. Teodorescu, and E. W.
Reynolds, submitted August 2002 to Plasma Phys. and Controlled Fusion 45, 869-889 (2003).

54.”Resonant-to-nonresonant transition in electrostatic ion-cyclotron phase velocity”, J. J. Carroll
III, M. E. Koepke, M. W. Zintl, and V. Gavrishchaka, Nonlinear Processes in Geophysics 10, 131-138 (2003).

53.”Evidence for thermal anisotropy effects on shear modified ion acoustic instabilities”, E. E. Scime, A. M. Keesee, R. S. Spangler, M. E. Koepke, C. Teodorescu, and E. W. Reynolds, Phys. Plasmas 9, 4399-4401 (2002).

52. “Interrelation between Space and Laboratory Experiments”, in Journal of Plasma and Fusion Research special issue on “Electric-Field Formation and its Effects in Space Plasma”, J. Plasma Fusion Res. 78, 1015-1021 (2002).

51. “Observation of inverse ion-cyclotron damping induced by parallel-velocity shear”, C. Teodorescu, E. W. Reynolds, and M. E. Koepke,JPhys. Rev. Lett. , 89, 105001 (2002).

50. “On the role of ion-temperature anisotropy in the growth and propagation of shear-modified ion-acoustic waves”, C. Teodorescu, M. E. Koepke, and E. W. Reynolds, J. Geophys. Res., (to appear 2002).

49. “Inhomogeneous magnetic-field-aligned ion flow measured in a Q machine”, M. E. Koepke, M.W. Zintl, C. Teodorescu, E. W. Reynolds, G. Wang, and T. N. Good, Phys. Plasmas ,9, 3225 (2002).

48. “Experimental verification of the shear-modified ion-acoustic instability”, C. Teodorescu, E. W. Reynolds, and M. E. Koepke,Phys. Rev. Lett. , 88, 185003 (2002).

47. “Contributions of Q-machine experiments to understanding auroral particle acceleration processes”, M. E. Koepke, Phys. Plasmas, 9, 2420 (2002).

46. “Spatio-temporal signatures of periodic pulling during ionization-wave mode transitions”, M. E. Koepke, A. Dinklage, T. Klinger, and C. Wilke, Phys. Plasmas,, 8, 1432 (2001).

45. “Inhomogeneous transverse electric fields and wave generation in the auroral region: A statistical study”, M. Hamrin, M. Andre, G. Ganguli, V. V. Gavrishchaka, M. E. Koepke, M. W. Zintl, N. Ivchenko, T. Karlsson, and J. H. Clemmons, J. Geophys. Res. , 106, 10803 (2001).

44. “Counter-streaming ion beams with inhomogeneous density profiles”, M. E. Koepke, M. W. Zintl,
E. M. Johnson, and E. W. Reynolds, and T. N. Good, Proceedings of the 2000 International Conference on Plasma Physics, Quebec City, Canada , (European Physical Society, Geneva, 2001) p. 45.

43. “Spatiotemporal laser perturbation of competing ionization waves in a neon glow discharge”, K.-D. Weltmann, M.E Koepke, and C. A.Selcher Phys. Rev. E, 62, 2773 (2000).

42. “Laboratory simulation of broadband ELF waves in the auroral ionosphere”, M.E. Koepke, J.J. Carroll III, M.W. Zintl, and V. Gavrishchaka, J. Geophys. Res.104, 14397 , 1999.

41. “Broadband electric-field spectral power density associated with electrostatic ion-cyclotron waves”, M.E. Koepke, M.W. Zintl, and J.J. Carroll III, in Phys. Space Plasmas (1998), T. Chang and J. Jasperse, eds. (MIT Center for Space Research, Cambridge, MA, 1998) p. 221, 1999.

40. “Control of ion temperature anisotropy in a helicon plasma”, E.E. Scime, P.A. Keiter, M.W. Zintl, M.M. Balkey, J.L. Kline, and M.E. Koepke, Plasma Sources Sci. and Techn. 7, 186 (1998).

39. “Effects of neutral collisions on the excitation threshold of electrostatic ion-cyclotron waves”, M.E. Koepke, M.W. Zintl, and T.N. Good, Geophys. Res. Lett. 25, 3095 (1998).

38. “Velocity-shear origin of low-frequency electrostatic ion-gyroresonant waves”, J.J. Carroll III, M.E. Koepke, M.W. Zintl, V. Gavrishchaka, and G. Ganguli, Geophys. Res. Lett.25, 3099 (1998).

37. “Velocity-shear-driven ion-cyclotron waves and associated transverse ion heating”,W.E. Amatucci, D.N. Walker, G. Ganguli, D.Duncan, J.A. Antoniades, J.H. Bowles, V. Gavrishchaka and M.E. Koepke, J. Geophys. Res. 103, 11711 (1998).

36. “Simultaneous observation of multiple nonlocal eigenmodes of an inhomogeneity-driven plasma
instability”,M.E. Koepke, J.J. Carroll III, M.W. Zintl, C.A. Selcher, and V. Gavrishchaka, Phys. Rev. Lett.80, 1441 (1998).

35. “High-order nonlocal formalism for linear analysis of magnetized multi-species plasma with inhomogenous flows”, M.E. Koepke, J.J. Carroll III, and M.W. Zintl, Phys. Plasmas 5, 10 (1998).

34. “Excitation and propagation of electrostatic ion-cyclotron waves in plasma with structured transverse flow”, M.E. Koepke, J.J. Carroll III, and M.W. Zintl, Phys. Plasmas 5, 1671 (1998).

33. “A simple Langmuir probe for alkali plasmas”, D. Strele, M. Koepke, R. Schrittwieser, and P. Winkler, Rev. Sci. Instrum. 67, 3751 (1997).

32. “Ion-cyclotron modes in a multi-component plasma with transverse-velocity shear”, V. Gavrishchaka, M. E. Koepke, and G. Ganguli, J. Geophys. Res. 102, 11653 (1997).

31. “Observations of velocity-shear-driven instabilities in a sodium plasma” (invited), J.J. Carroll III, M.E. Koepke, M.W. Zintl, C.A. Selcher, V. Gavrishchaka, and E. Csomortani in Double Layers - Potential Formation and Related Nonlinear Phenomena in Plasmas (World Scientific, Singapore, 1997) p. 283.

30. “Perpendicular ion heating by velocity-shear-driven waves”, D. N. Walker, W. E. Amatucci, G. Ganguli, J. A. Antoniades, J. Bowles, D. Duncan, V. Gavrishchaka, and M. E. Koepke. Geophys. Res. Lett.24, 1187 (1997).

29. “Laboratory simulation of broadband ELF waves in the auroral ionosphere,” M. E. Koepke, J. J. Carroll III, and M. W. Zintl, J. Geophys. Res. , submitted(1998).

28. “Velocity-shear origin of low-frequency electrostatic waves,” J. J. Carroll III, M. E. Koepke, M. W. zintl, V. Gavrishchaka, and G. Ganguli, Geophys. Res. Lett., XXXX (1998).

27. “An effect of neutral collisions on the excitation threshold of electrostatic ion-cyclotron
waves,” M. E. Koepke, M. W. Zitnl, and T. N. Good, Geophys. Res. Lett., XXXX (1998).

26. “Velocity-shear-driven ion-cyclotron waves and associated transverse ion heating.” W. E. Amatucci, D. N. Walker, G. Ganguli, D. Duncan, J.A. Antoniades, J. H. Bowles, V. Gavrishchaka, and M. E. Koepke, J. Geophys. Res. 103, 11711 (1998).

25. “Control of ion temperature anisotropy in a helicon plasma,” E. E. Scime, P. A. Keiter, M. W. Zintl,
M. M. Balkey, J. L. Kline, and M. E. Koepke, Plasma Sources Sci. Technol.7, 186 (1998).

24. “Excitation and propagation of electrostatic ion-cyclotron waves in plasma with structured transverse flow,” M. E. Koepke, J. J. Carroll III, and M. W. Zintl, Phys. Plasmas5, 1671 (1998).

23. “High-order nonlocal formalism for linear analysis of a magnetized multispecies plasma with
inhomogeneous flows” V. V. Gavrishchaka, G. I. Ganguli, P. M. Bakshi, and M. E. Koepke, Phys. Plasmas5, 10 (1998).

22. “Simultaneous observation of multiple non local eigenmodes of an inhomogeneity-driven plasma
instability”, M. E. Koepke, J. J. Carroll III, M. W. Zintl, C. A. Selcher, and V. Gavrishchaka, submitted to Phys. Rev. Lett., 1997

21. “Simple heatable Langmuir probe for alkali plasmas,” D. Strele, M. Koepke, R. Schrittwieser, and P. Winkler, Rev. Sci. Instrum.68, 3751 (1997).

20. “Perpendicular ion heating by velocity-shear-driven waves”, D. N. Walker, W. E. Amatucci, G.Ganguli, J. A. Antoniades, J. H. Bowles, D. Duncan, V. Gavrishchaka, and M. E. Koepke, Geophys. Res. Lett.24, 1187 (1996).

19. “Observation of velocity-shear-driven instabilities in a sodium plasma “ (invited), J. J. Carroll III, M. E. Koepke, M. W. Zintl, C. A. Selcher, V. Gavrishchaka, and E. Csomortani in Double Layers - Potential Formation and Related Nonlinear Phenomena in Plasmas (World Scientific, Singapore, 1997) p. 283

18. “Space Chamber Investigations of Transverse Velocity Shear Driven Plasma Waves”, W. E. Amatucci, D. N. Walker, G. Ganguli, J. A. Antoniades, D. Duncan, J. Bowles, V. Gavrishchaka, and M. E. Koepke in Double Layers - Potential Formation and Related Nonlinear Phenomena in Plasmas (World Scientific, Singapore, 1997) p. 277

17. “High-order nonlocal formalism for linear analysis of a magnetized multi-species plasma with inhomogeneous flows”, V. V. Gavrishchaka, G. I. Ganguli, P. M. Bakshi, and M. E. Koepke, Phys. Plasmas, accepted

16. “Ion-cyclotron modes in a two-ion-component plasma with transverse-velocity shear,” V. V.
Gavrishchaka, M. E. Koepke, and G. Ganguli, J. Geophys. Res.102, 11653 (1997).

15. “Inhomogeneity scale lengths in the WVU Q machine”, J. J. Carroll III and M. E. Koepke, in Physics
of Space Plasmas (1995), Chang and Jasperse, eds. (MIT, Cambridge, MA, 1996) p. 625.

14. “Periodic nonlinear wave-wave interaction in a plasma discharge with no external oscillatory force”, M. E. Koepke, T. Klinger, F. Seddighi, and A. Piel, Phys. Plasmas3, 4421 (1996).

13. “Plasma response to strongly sheared flow,” W. E. Amatucci, D. N. Walker, J. A. Antoniades, G.
Ganguli, D. Duncan, J. H. Bowles, V. Gavrishchaka, and M. E. Koepke, Phys. Rev. Lett. 77, 1978 (1996).

12. “Dispersive properties of a magnetized plasma with a field-aligned drift and inhomogeneous
transverse flow,” V. Gavrishchaka, M. E. Koepke, and G. Ganguli, Phys. Plasmas 3, 3091 (1996).

11. “Frequency range and spectral width of waves associated with transverse-velocity shear,” V.
Gavrishchaka, M. E. Koepke, J. J. Carroll III, W. E. Amatucci, and G. Ganguli, in Cross-Scale Coupling in Space Plasma, Geophysical Monograph Series, vol. 93, Horwitz, Singh, and Burch, eds. (AGU, Washington, D.C., 1995) p. 81-85.

10. “van der Pol behavior of relaxation oscillations in a periodically driven thermionic discharge,” T. Klinger, F. Greiner, A. Rohde, A. Piel, and M. E. Koepke, Phys Rev. E52, 4316-4327 (1995).

9. “Velocity-shear-induced ion-cyclotron turbulence: Laboratory identification and space applications,” M. E. Koepke, W. E. Amatucci, J. J. Carroll III, V. Gavrishchaka, and G. Ganguli, Phys. Plasmas2, 2523-31 (1995).

8. “A segmented disk electrode to produce and control parallel and transverse particle drifts in a
cylindrical plasma,” J. J. Carroll III, M. E. Koepke, W. E. Amatucci, T. E. Sheridan, and M. J. Alport, Rev. Sci. Instrum. 65, 2991-2998 (1994).

7. “Observation of ion-cyclotron turbulence at small values of magnetic field-aligned current,” W. E. Amatucci, M. E. Koepke, J. J. Carroll III, and T. E. Sheridan, Geophys. Res. Lett.21, 1595-1598 (1994).

6. “Experimental verification of the inhomogeneous energy-density driven instability,” M. E. Koepke, W. E. Amatucci, J. J. Carroll III, and T. E. Sheridan, Phys. Rev. Lett.72, 3355-3358 (1994).

5. “Asymmetric spectral broadening of modulated electrostatic ion-cyclotron waves,” M. E. Koepke,
M. J. Alport, T. E. Sheridan, W. E. Amatucci, and J. J. Carroll III, Geophys. Res. Lett.21, 1011-1014 (1994).

4. “Self-cleaning Langmuir probe,” W. E. Amatucci, M. E. Koepke, T. E. Sheridan, M. J. Alport, and J. J. Carroll III, Rev. Sci. Instrum. 64 , 1352-1356 (1993).

3. “Electrostatic ion-cyclotron experiments in the WVU Q machine”, M. E. Koepke and W. E. Amatucci, IEEE Trans. Plasma Sci. Instrum.PS-20 , 631 (1992).

2. “Effect of bounce resonance damping on the harmonics of a plasma microinstability”, M. E. Koepke, Phys. Fluids B4, 1193 (1992).

1. “Experimental verification of periodic pulling in a nonlinear electronic oscillator”, M. E. Koepke and D. M. Hartley, Phys. Rev. A 44 , 6877 (1991).