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College of Arts and Sciences

Mark H. Hess

Mark H.  Hess Assistant Professor
Accelerator Physics

B.S., University of Maryland at College Park, 1997
Ph.D., Massachusetts Institute of Technology, 2004
Postdoctoral Positions:
     MIT Postdoctoral Associate, June 2002-July 2004
     Part-time Faculty Clark University/WPI, January 2003-May 2003

Phone: Swain West 202 (812)856-1976
Email: mhhess at

Group Webpage

Accelerator / Beam / Nonneutral Plasma Physics

For many years, scientists have associated the frontier of accelerator/beam physics with the construction of high-energy (now on the order of 1 TeV=1012 eV) particle physics experiments. Today however, the most challenging, and arguably the most interesting problems in accelerator/beam physics occur in the low energy, high space charge regime. In this regime, the beam behaves more like a nonneutral plasma than the conventional low space charge beams used in particle physics experiments. My research has been centered on understanding the fundamental properties of high space charge beams, as well as their applicability to numerous areas including, microwave source generation, electron and ion sources, and spallation neutron sources.

Selected Publications

  • M. Hess and C. Chen, "Space-charge limit for a finite-size bunched beam in a circular conducting pipe”, Phys. Rev. ST Accel. Beams 7, 092002 (2004).
  • M. Hess and C. Chen, "Equilibrium and confinement of bunched annular beams”, Phys. Plasmas 9, 1422 (2002).
  • M. Hess and C. Chen, “Beam Confinement in Periodic Permanent Magnet Focusing Klystrons”, Phys. Lett. A, 295, 305 (2002).
  • M. Hess and C. Chen, “Confinement criterion for a highly bunched beam”, Phys. Plasmas, 7, 5206 (2000).
  • E. Rosa, E. Ott, and M. Hess, “Transition to Phase Synchronization of Chaos”, Phys. Rev. Lett., 80, 1642 (1998).